fix(engine): send confirmed:true from game-over screen New Game handlers

The 'No Moves Available' dialog's New Game button and keyboard shortcut were firing NewGameRequestEvent::default() (confirmed: false). When the player has made moves, handle_new_game sees needs_confirm = true, then hits the scrims.is_empty() guard — which is false because the GameOver- Screen itself is a ModalScrim — and silently returns without starting a new game or showing the confirm dialog. Fix: set confirmed: true in both handle_game_over_input (N/Escape key) and handle_game_over_button_input (click). The game is already stuck so the abandon-confirmation guard does not apply, as the doc comment on the button handler has always said. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
fix(ci): pass Quaternions registry token as Docker build secret
2026-06-01 15:26:07 -07:00 · 2026-06-01 14:58:25 -07:00 · 2026-06-01 14:53:36 -07:00 · 2026-06-01 14:24:27 -07:00 · 2026-06-01 14:16:19 -07:00 · 2026-06-01 13:55:39 -07:00
72 changed files with 11697 additions and 11083 deletions
@@ -0,0 +1,5 @@
+[registries.Quaternions]
+index = "sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/"
+
+[target.wasm32-unknown-unknown]
+rustflags = ['--cfg', 'getrandom_backend="wasm_js"']
@@ -8,8 +8,10 @@ on:
      - 'solitaire_server/**'
      - 'solitaire_sync/**'
      - 'solitaire_core/**'
+      - 'solitaire_engine/**'
      - 'Cargo.toml'
      - 'Cargo.lock'
+      - 'solitaire_server/Dockerfile'
      - '.gitea/workflows/docker-build.yml'

 env:
@@ -55,6 +57,8 @@ jobs:
            ${{ env.IMAGE }}:latest
          cache-from: type=registry,ref=${{ env.IMAGE }}:buildcache
          cache-to: type=registry,ref=${{ env.IMAGE }}:buildcache,mode=max
+          secrets: |
+            cargo_token=${{ secrets.CI_TOKEN }}

      - name: Install kustomize
        run: |
@@ -364,6 +364,12 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"

+[[package]]
+name = "arrayvec"
+version = "0.7.6"
+source = "sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/"
+checksum = "813440870d646c57c222c1d713dc4e3ddcb2919c3801564d767d85d7bf2afee4"
+
 [[package]]
 name = "as-raw-xcb-connection"
 version = "1.0.1"
@@ -717,6 +723,28 @@ dependencies = [
 "android-activity",
 ]

+[[package]]
+name = "bevy_anti_alias"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "726cc494eb7d6a84ce6291c23636fd451fa4846604dc059fa93febca4e60a928"
+dependencies = [
+ "bevy_app",
+ "bevy_asset",
+ "bevy_camera",
+ "bevy_core_pipeline",
+ "bevy_derive",
+ "bevy_diagnostic",
+ "bevy_ecs",
+ "bevy_image",
+ "bevy_math",
+ "bevy_reflect",
+ "bevy_render",
+ "bevy_shader",
+ "bevy_utils",
+ "tracing",
+]
+
 [[package]]
 name = "bevy_app"
 version = "0.18.1"
@@ -878,6 +906,35 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "bevy_dev_tools"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4f1464a3f5ef5c23d917987714ee89881f9f791e9ff97ecf6600ee846b9569e"
+dependencies = [
+ "bevy_app",
+ "bevy_asset",
+ "bevy_camera",
+ "bevy_color",
+ "bevy_diagnostic",
+ "bevy_ecs",
+ "bevy_image",
+ "bevy_input",
+ "bevy_math",
+ "bevy_picking",
+ "bevy_reflect",
+ "bevy_render",
+ "bevy_shader",
+ "bevy_state",
+ "bevy_text",
+ "bevy_time",
+ "bevy_transform",
+ "bevy_ui",
+ "bevy_ui_render",
+ "bevy_window",
+ "tracing",
+]
+
 [[package]]
 name = "bevy_diagnostic"
 version = "0.18.1"
@@ -901,7 +958,7 @@ version = "0.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c9cf7a3ee41342dd7b5a5d82e200d0e8efb933169247fce853b4ad633d51e87d"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bevy_ecs_macros",
 "bevy_platform",
 "bevy_ptr",
@@ -945,6 +1002,36 @@ dependencies = [
 "encase_derive_impl",
 ]

+[[package]]
+name = "bevy_feathers"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cb29be8f8443c5cc44e1c4710bbe02877e73703c60228ca043f20529a5496c6"
+dependencies = [
+ "accesskit",
+ "bevy_a11y",
+ "bevy_app",
+ "bevy_asset",
+ "bevy_camera",
+ "bevy_color",
+ "bevy_derive",
+ "bevy_ecs",
+ "bevy_input_focus",
+ "bevy_log",
+ "bevy_math",
+ "bevy_picking",
+ "bevy_platform",
+ "bevy_reflect",
+ "bevy_render",
+ "bevy_shader",
+ "bevy_text",
+ "bevy_ui",
+ "bevy_ui_render",
+ "bevy_ui_widgets",
+ "bevy_window",
+ "smol_str",
+]
+
 [[package]]
 name = "bevy_gizmos"
 version = "0.18.1"
@@ -1067,14 +1154,17 @@ checksum = "6a11df62e49897def470471551c02f13c6fb488e55dddb5ab7ef098132e07754"
 dependencies = [
 "bevy_a11y",
 "bevy_android",
+ "bevy_anti_alias",
 "bevy_app",
 "bevy_asset",
 "bevy_camera",
 "bevy_color",
 "bevy_core_pipeline",
 "bevy_derive",
+ "bevy_dev_tools",
 "bevy_diagnostic",
 "bevy_ecs",
+ "bevy_feathers",
 "bevy_gizmos_render",
 "bevy_image",
 "bevy_input",
@@ -1082,6 +1172,7 @@ dependencies = [
 "bevy_log",
 "bevy_math",
 "bevy_mesh",
+ "bevy_pbr",
 "bevy_platform",
 "bevy_ptr",
 "bevy_reflect",
@@ -1101,6 +1192,27 @@ dependencies = [
 "bevy_winit",
 ]

+[[package]]
+name = "bevy_light"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d9d2ac64390a9baacb3c0fa0f5456ac1553959d5a387874c102a09aab8b92cc"
+dependencies = [
+ "bevy_app",
+ "bevy_asset",
+ "bevy_camera",
+ "bevy_color",
+ "bevy_ecs",
+ "bevy_image",
+ "bevy_math",
+ "bevy_mesh",
+ "bevy_platform",
+ "bevy_reflect",
+ "bevy_transform",
+ "bevy_utils",
+ "tracing",
+]
+
 [[package]]
 name = "bevy_log"
 version = "0.18.1"
@@ -1138,7 +1250,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e931fa969f89c83498b22c97432383afe90e90fd1a5e04fa07be8da4d3bcac84"
 dependencies = [
 "approx",
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bevy_reflect",
 "derive_more",
 "glam 0.30.10",
@@ -1161,7 +1273,9 @@ dependencies = [
 "bevy_asset",
 "bevy_derive",
 "bevy_ecs",
+ "bevy_image",
 "bevy_math",
+ "bevy_mikktspace",
 "bevy_platform",
 "bevy_reflect",
 "bevy_transform",
@@ -1174,6 +1288,71 @@ dependencies = [
 "wgpu-types",
 ]

+[[package]]
+name = "bevy_mikktspace"
+version = "0.17.0-dev"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ef8e4b7e61dfe7719bb03c884dc270cd46a82efb40f93e9933b990c5c190c59"
+
+[[package]]
+name = "bevy_pbr"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5ab6944ffc6fd71604c0fbca68cc3e2a3654edfcdbfd232f9d8b88e3d20fdc0"
+dependencies = [
+ "bevy_app",
+ "bevy_asset",
+ "bevy_camera",
+ "bevy_color",
+ "bevy_core_pipeline",
+ "bevy_derive",
+ "bevy_diagnostic",
+ "bevy_ecs",
+ "bevy_image",
+ "bevy_light",
+ "bevy_log",
+ "bevy_math",
+ "bevy_mesh",
+ "bevy_platform",
+ "bevy_reflect",
+ "bevy_render",
+ "bevy_shader",
+ "bevy_transform",
+ "bevy_utils",
+ "bitflags 2.11.1",
+ "bytemuck",
+ "derive_more",
+ "fixedbitset",
+ "nonmax",
+ "offset-allocator",
+ "smallvec",
+ "static_assertions",
+ "thiserror 2.0.18",
+ "tracing",
+]
+
+[[package]]
+name = "bevy_picking"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7d524dbc8f2c9e73f7ab70c148c8f7886f3c24b8aa8c252a38ba68ed06cbf10"
+dependencies = [
+ "bevy_app",
+ "bevy_asset",
+ "bevy_camera",
+ "bevy_derive",
+ "bevy_ecs",
+ "bevy_input",
+ "bevy_math",
+ "bevy_platform",
+ "bevy_reflect",
+ "bevy_time",
+ "bevy_transform",
+ "bevy_window",
+ "tracing",
+ "uuid",
+]
+
 [[package]]
 name = "bevy_platform"
 version = "0.18.1"
@@ -1500,6 +1679,7 @@ dependencies = [
 "bevy_input",
 "bevy_input_focus",
 "bevy_math",
+ "bevy_picking",
 "bevy_platform",
 "bevy_reflect",
 "bevy_sprite",
@@ -1512,6 +1692,7 @@ dependencies = [
 "taffy",
 "thiserror 2.0.18",
 "tracing",
+ "uuid",
 ]

 [[package]]
@@ -1545,6 +1726,26 @@ dependencies = [
 "tracing",
 ]

+[[package]]
+name = "bevy_ui_widgets"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6a63cb818b0de41bdb14990e0ce1aaaa347f871750ab280f80c427e83d72712"
+dependencies = [
+ "accesskit",
+ "bevy_a11y",
+ "bevy_app",
+ "bevy_camera",
+ "bevy_ecs",
+ "bevy_input",
+ "bevy_input_focus",
+ "bevy_log",
+ "bevy_math",
+ "bevy_picking",
+ "bevy_reflect",
+ "bevy_ui",
+]
+
 [[package]]
 name = "bevy_utils"
 version = "0.18.1"
@@ -1672,6 +1873,7 @@ version = "2.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4512299f36f043ab09a583e57bceb5a5aab7a73db1805848e8fef3c9e8c78b3"
 dependencies = [
+ "bytemuck",
 "serde_core",
 ]

@@ -1703,7 +1905,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0aa83c34e62843d924f905e0f5c866eb1dd6545fc4d719e803d9ba6030371fce"
 dependencies = [
 "arrayref",
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "cc",
 "cfg-if",
 "constant_time_eq",
@@ -1879,6 +2081,15 @@ dependencies = [
 "wayland-client",
 ]

+[[package]]
+name = "card_game"
+version = "0.4.0"
+source = "sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/"
+checksum = "d206df6d87340019a0f5b621976cf98bc75c659a7f93ef348aaab2a9336098a9"
+dependencies = [
+ "arrayvec 0.7.6 (sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/)",
+]
+
 [[package]]
 name = "cbc"
 version = "0.1.2"
@@ -1939,6 +2150,17 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "18758054972164c3264f7c8386f5fc6da6114cb46b619fd365d4e3b2dc3ae487"

+[[package]]
+name = "chacha20"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f8d983286843e49675a4b7a2d174efe136dc93a18d69130dd18198a6c167601"
+dependencies = [
+ "cfg-if",
+ "cpufeatures 0.3.0",
+ "rand_core 0.10.1",
+]
+
 [[package]]
 name = "chrono"
 version = "0.4.44"
@@ -3457,6 +3679,17 @@ dependencies = [
 "weezl",
 ]

+[[package]]
+name = "gl_generator"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a95dfc23a2b4a9a2f5ab41d194f8bfda3cabec42af4e39f08c339eb2a0c124d"
+dependencies = [
+ "khronos_api",
+ "log",
+ "xml-rs",
+]
+
 [[package]]
 name = "glam"
 version = "0.30.10"
@@ -3485,6 +3718,27 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0cc23270f6e1808e30a928bdc84dea0b9b4136a8bc82338574f23baf47bbd280"

+[[package]]
+name = "glow"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5e5ea60d70410161c8bf5da3fdfeaa1c72ed2c15f8bbb9d19fe3a4fad085f08"
+dependencies = [
+ "js-sys",
+ "slotmap",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "glutin_wgl_sys"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c4ee00b289aba7a9e5306d57c2d05499b2e5dc427f84ac708bd2c090212cf3e"
+dependencies = [
+ "gl_generator",
+]
+
 [[package]]
 name = "governor"
 version = "0.10.4"
@@ -4309,6 +4563,23 @@ dependencies = [
 "uuid",
 ]

+[[package]]
+name = "khronos-egl"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6aae1df220ece3c0ada96b8153459b67eebe9ae9212258bb0134ae60416fdf76"
+dependencies = [
+ "libc",
+ "libloading",
+ "pkg-config",
+]
+
+[[package]]
+name = "khronos_api"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2db585e1d738fc771bf08a151420d3ed193d9d895a36df7f6f8a9456b911ddc"
+
 [[package]]
 name = "kira"
 version = "0.12.0"
@@ -4326,13 +4597,23 @@ dependencies = [
 "triple_buffer",
 ]

+[[package]]
+name = "klondike"
+version = "0.3.0"
+source = "sparse+https://git.aleshym.co/api/packages/Quaternions/cargo/"
+checksum = "347d55e6cf7c90b3d038262071eb2fdb0b75a713fe66c452a3400ff08fb716bc"
+dependencies = [
+ "card_game",
+ "rand 0.10.1",
+]
+
 [[package]]
 name = "kurbo"
 version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7564e90fe3c0d5771e1f0bc95322b21baaeaa0d9213fa6a0b61c99f8b17b3bfb"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "euclid",
 "smallvec",
 ]
@@ -4740,7 +5021,7 @@ version = "27.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "066cf25f0e8b11ee0df221219010f213ad429855f57c494f995590c861a9a7d8"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bit-set",
 "bitflags 2.11.1",
 "cfg-if",
@@ -5947,6 +6228,16 @@ dependencies = [
 "rand_core 0.9.5",
 ]

+[[package]]
+name = "rand"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2e8e8bcc7961af1fdac401278c6a831614941f6164ee3bf4ce61b7edb162207"
+dependencies = [
+ "chacha20",
+ "rand_core 0.10.1",
+]
+
 [[package]]
 name = "rand_chacha"
 version = "0.3.1"
@@ -5985,6 +6276,12 @@ dependencies = [
 "getrandom 0.3.4",
 ]

+[[package]]
+name = "rand_core"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "63b8176103e19a2643978565ca18b50549f6101881c443590420e4dc998a3c69"
+
 [[package]]
 name = "rand_distr"
 version = "0.5.1"
@@ -6980,7 +7277,8 @@ dependencies = [
 name = "solitaire_core"
 version = "0.1.0"
 dependencies = [
- "rand 0.9.4",
+ "card_game",
+ "klondike",
 "serde",
 "thiserror 2.0.18",
 ]
@@ -6997,6 +7295,7 @@ dependencies = [
 "jni 0.21.1",
 "jsonwebtoken",
 "keyring-core",
+ "klondike",
 "reqwest",
 "serde",
 "serde_json",
@@ -7023,6 +7322,7 @@ dependencies = [
 "image",
 "jni 0.21.1",
 "kira",
+ "klondike",
 "reqwest",
 "resvg",
 "ron",
@@ -7082,6 +7382,7 @@ dependencies = [
 "chrono",
 "console_error_panic_hook",
 "getrandom 0.3.4",
+ "klondike",
 "serde",
 "serde-wasm-bindgen",
 "serde_json",
@@ -7090,6 +7391,18 @@ dependencies = [
 "web-sys",
 ]

+[[package]]
+name = "solitaire_web"
+version = "0.1.0"
+dependencies = [
+ "bevy",
+ "console_error_panic_hook",
+ "getrandom 0.3.4",
+ "solitaire_data",
+ "solitaire_engine",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -7502,7 +7815,7 @@ version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ea00cc4f79b7f6bb7ff87eddc065a1066f3a43fe1875979056672c9ef948c2af"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bitflags 1.3.2",
 "bytemuck",
 "lazy_static",
@@ -7601,7 +7914,7 @@ version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "41ba83ebaf2954d31d05d67340fd46cebe99da2b7133b0dd68d70c65473a437b"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "grid",
 "serde",
 "slotmap",
@@ -7870,7 +8183,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "83d13394d44dae3207b52a326c0c85a8bf87f1541f23b0d143811088497b09ab"
 dependencies = [
 "arrayref",
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bytemuck",
 "cfg-if",
 "log",
@@ -7884,7 +8197,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "47ffee5eaaf5527f630fb0e356b90ebdec84d5d18d937c5e440350f88c5a91ea"
 dependencies = [
 "arrayref",
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bytemuck",
 "cfg-if",
 "log",
@@ -9044,12 +9357,13 @@ version = "27.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bfe68bac7cde125de7a731c3400723cadaaf1703795ad3f4805f187459cd7a77"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bitflags 2.11.1",
 "cfg-if",
 "cfg_aliases",
 "document-features",
 "hashbrown 0.16.1",
+ "js-sys",
 "log",
 "naga",
 "portable-atomic",
@@ -9057,6 +9371,8 @@ dependencies = [
 "raw-window-handle",
 "smallvec",
 "static_assertions",
+ "wasm-bindgen",
+ "web-sys",
 "wgpu-core",
 "wgpu-hal",
 "wgpu-types",
@@ -9068,7 +9384,7 @@ version = "27.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "27a75de515543b1897b26119f93731b385a19aea165a1ec5f0e3acecc229cae7"
 dependencies = [
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "bit-set",
 "bit-vec",
 "bitflags 2.11.1",
@@ -9088,6 +9404,7 @@ dependencies = [
 "smallvec",
 "thiserror 2.0.18",
 "wgpu-core-deps-apple",
+ "wgpu-core-deps-wasm",
 "wgpu-core-deps-windows-linux-android",
 "wgpu-hal",
 "wgpu-types",
@@ -9102,6 +9419,15 @@ dependencies = [
 "wgpu-hal",
 ]

+[[package]]
+name = "wgpu-core-deps-wasm"
+version = "27.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b1027dcf3b027a877e44819df7ceb0e2e98578830f8cd34cd6c3c7c2a7a50b7"
+dependencies = [
+ "wgpu-hal",
+]
+
 [[package]]
 name = "wgpu-core-deps-windows-linux-android"
 version = "27.0.0"
@@ -9118,7 +9444,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b21cb61c57ee198bc4aff71aeadff4cbb80b927beb912506af9c780d64313ce"
 dependencies = [
 "android_system_properties",
- "arrayvec",
+ "arrayvec 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
 "ash",
 "bit-set",
 "bitflags 2.11.1",
@@ -9127,15 +9453,20 @@ dependencies = [
 "cfg-if",
 "cfg_aliases",
 "core-graphics-types 0.2.0",
+ "glow",
+ "glutin_wgl_sys",
 "gpu-alloc",
 "gpu-allocator",
 "gpu-descriptor",
 "hashbrown 0.16.1",
+ "js-sys",
+ "khronos-egl",
 "libc",
 "libloading",
 "log",
 "metal",
 "naga",
+ "ndk-sys",
 "objc",
 "once_cell",
 "ordered-float",
@@ -9148,6 +9479,8 @@ dependencies = [
 "renderdoc-sys",
 "smallvec",
 "thiserror 2.0.18",
+ "wasm-bindgen",
+ "web-sys",
 "wgpu-types",
 "windows 0.58.0",
 "windows-core 0.58.0",
@@ -10030,6 +10363,12 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9cc00251562a284751c9973bace760d86c0276c471b4be569fe6b068ee97a56"

+[[package]]
+name = "xml-rs"
+version = "0.8.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ae8337f8a065cfc972643663ea4279e04e7256de865aa66fe25cec5fb912d3f"
+
 [[package]]
 name = "xmlwriter"
 version = "0.1.0"
@@ -8,6 +8,7 @@ members = [
    "solitaire_app",
    "solitaire_assetgen",
    "solitaire_wasm",
+    "solitaire_web",
 ]
 resolver = "2"

@@ -21,7 +22,7 @@ rust-version = "1.95"
 serde       = { version = "1", features = ["derive"] }
 serde_json  = "1"
 uuid        = { version = "1", features = ["v4", "serde"] }
-chrono      = { version = "0.4", features = ["serde"] }
+chrono      = { version = "0.4", features = ["serde", "wasmbind"] }
 thiserror   = "2"
 rand        = "0.9"
 async-trait = "0.1"
@@ -37,6 +38,8 @@ solitaire_core   = { path = "solitaire_core" }
 solitaire_sync   = { path = "solitaire_sync" }
 solitaire_data   = { path = "solitaire_data" }
 solitaire_engine = { path = "solitaire_engine" }
+klondike         = { version = "0.3.0", registry = "Quaternions" }
+card_game        = { version = "0.4.0", registry = "Quaternions" }

 # Bevy with `default-features = false` to avoid the unused
 # `bevy_audio → rodio + symphonia + cpal 0.15 + alsa 0.9` chain.
@@ -1,18 +1,21 @@
 #!/usr/bin/env bash
-# Rebuild the solitaire_wasm crate and install the output into
-# solitaire_server/web/pkg/ so the server can serve the replay viewer.
+# Rebuild WASM artifacts and install them into solitaire_server/web/pkg/.
+#
+# Two artifacts are produced:
+#   solitaire_wasm.*  — thin replay-viewer + interactive JS API (wasm-pack)
+#   canvas.*          — full Bevy WASM app for play.html (cargo + wasm-bindgen)
 #
 # Prerequisites:
-#   cargo install wasm-pack
+#   cargo install wasm-pack wasm-bindgen-cli
 #   rustup target add wasm32-unknown-unknown
+#   (optional) cargo install wasm-opt   # for smaller canvas_bg.wasm
 #
 # Run from the repo root:
 #   ./build_wasm.sh
 #
-# The generated files (solitaire_wasm.js + solitaire_wasm_bg.wasm) are
-# committed to git so self-hosters who don't touch the WASM crate can
-# skip this step.  Regenerate after any change to solitaire_wasm/ or
-# solitaire_core/.
+# The generated pkg/ files are committed to git so self-hosters who don't
+# touch the WASM crates can skip this step.  Regenerate after any change to
+# solitaire_wasm/, solitaire_web/, solitaire_engine/, or solitaire_core/.

 set -euo pipefail

@@ -36,5 +39,39 @@ wasm-pack build \
 # Remove them — we manage the output directory ourselves.
 rm -f "$OUT_DIR/package.json" "$OUT_DIR/.gitignore"

+# ---------------------------------------------------------------------------
+# Bevy WASM app (solitaire_web → canvas.js + canvas_bg.wasm)
+# ---------------------------------------------------------------------------
+
+if ! command -v wasm-bindgen &> /dev/null; then
+    echo "error: wasm-bindgen not found." >&2
+    echo "  Install with: cargo install wasm-bindgen-cli" >&2
+    echo "  The CLI version must match the wasm-bindgen crate dep." >&2
+    exit 1
+fi
+
+echo "Building solitaire_web (Bevy WASM app)..."
+cargo build --release --target wasm32-unknown-unknown -p solitaire_web
+
+echo "Running wasm-bindgen for solitaire_web..."
+wasm-bindgen \
+    --out-dir "$OUT_DIR" \
+    --out-name canvas \
+    --target web \
+    --no-typescript \
+    "$REPO_ROOT/target/wasm32-unknown-unknown/release/solitaire_web.wasm"
+
+# Optional size optimisation — Bevy bundles are large (~5-15 MB uncompressed).
+# wasm-opt passes are skipped silently when the tool is not installed.
+if command -v wasm-opt &> /dev/null; then
+    echo "Running wasm-opt on canvas_bg.wasm..."
+    wasm-opt -Oz \
+        -o "$OUT_DIR/canvas_bg.wasm" \
+        "$OUT_DIR/canvas_bg.wasm"
+else
+    echo "note: wasm-opt not found; skipping size optimisation."
+    echo "  Install with: cargo install wasm-opt  (or via binaryen)"
+fi
+
 echo "Done. Output:"
 ls -lh "$OUT_DIR"
@@ -0,0 +1,167 @@
+# Integrating `card_game` / `klondike` as the Solitaire Core
+
+**Context:** A collaborator ([Quaternions](https://git.aleshym.co/Quaternions/card_game)) is building a pure-logic Klondike library in Rust. This document maps what that library currently provides against what Ferrous Solitaire's `solitaire_core` crate requires.
+
+**Approach:** Most gaps are closed in Ferrous Solitaire's own `solitaire_core` crate via a wrapper/adapter layer. Gaps 1, 3, and 4 have been addressed upstream. Integration is ready to begin.
+
+---
+
+## What `card_game` + `klondike` Already Has
+
+### `card_game` crate (generic primitives) — v0.4.0
+| Feature | Notes |
+|---|---|
+| `Card` (Deck + Suit + Rank packed in 1 byte) | `NonZeroU8` layout — no heap allocation |
+| `Suit`, `Rank`, `Deck` enums | Full A→K, 4 suits, up to 4 deck IDs |
+| `Stack<CAP>` | Const-generic `ArrayVec` wrapper |
+| `Pile<DN, UP>` | Face-down + face-up stacks; `flip_up`, `pop_flip_up` |
+| `Game` trait | `possible_instructions`, `is_instruction_valid`, `process_instruction`, `is_win` |
+| `Session` | Wraps a `Game`; snapshot-based undo (O(1)), score including undo penalty |
+| `Session::solve()` | Built-in DFS solver with move/state budgets; returns `Solution<G>` or `SolveError` |
+| `StateSnapshot<G>` | Pre-move state + instruction; used by snapshot history and `Solution` |
+| `SessionState::score()` | = `game_score + undos × undo_penalty` (−15 by default via `SessionConfig`) |
+| `SessionConfig` | `undo_penalty`, `solve_moves_budget`, `solve_states_budget` |
+
+### `klondike` crate (Klondike rules) — v0.3.0
+| Feature | Notes |
+|---|---|
+| 7 tableau + 4 foundation + 1 stock | Fully dealt from a seeded RNG |
+| Draw-1 / Draw-3 config | `KlondikeConfig::draw_stock` (`DrawStockConfig`) |
+| `MoveFromFoundationConfig` | `Allowed` (upstream default) / `Disallowed`; controls foundation → tableau rule |
+| `ScoringConfig` | Configurable deltas: `move_to_foundation` (+10), `flip_up_bonus` (+5), `move_to_tableau` (+5), `move_from_foundation` (−15), `recycle` (0 by default) |
+| `KlondikeStats::score(&config)` | Computes score from per-event counters × `ScoringConfig` deltas |
+| `KlondikeStats` counters | `move_to_foundation_count`, `flip_up_bonus_count`, `move_to_tableau_count`, `move_from_foundation_count`, `recycle_count`, `moves` |
+| Foundation placement (Ace start, suit-matched A→K) | ✅ |
+| Tableau placement (alternating colour, K on empty) | ✅ |
+| Multi-card stack moves (via `SkipCards`) | ✅ |
+| `RotateStock` (recycle waste → stock) | ✅ |
+| `is_win_trivial` (all face-down cards cleared) | Auto-complete trigger |
+| `get_auto_move` / `get_sorted_moves` | Priority-ranked move suggestion (take `&KlondikeConfig`) |
+| Benchmark suite (`klondike-bench`) | 1 000-game throughput test |
+| CLI display (`klondike-cli`) | Terminal renderer |
+
+---
+
+## What Ferrous Solitaire's `solitaire_core` Needs (Gaps)
+
+### 1. Scoring — remaining adapter responsibilities
+Ferrous uses **Windows XP Standard** scoring. The exact table already implemented in `solitaire_core/src/scoring.rs`:
+
+| Event | Delta | Handled by |
+|---|---|---|
+| Any card → foundation | +10 | `KlondikeStats` / `ScoringConfig::move_to_foundation` ✅ |
+| Waste → tableau | +5 | `KlondikeStats` / `ScoringConfig::move_to_tableau` ✅ |
+| Flip face-down tableau card | +5 | `KlondikeStats` / `ScoringConfig::flip_up_bonus` ✅ |
+| Foundation → tableau | −15 | `KlondikeStats` / `ScoringConfig::move_from_foundation` ✅ |
+| Undo | −15 | `SessionStats` / `SessionConfig::undo_penalty` ✅ |
+| Recycle (Draw-1, after 1st free) | −100 | **Our adapter** — see below |
+| Recycle (Draw-3, after 3rd free) | −20 | **Our adapter** — see below |
+| Score floor | `score.max(0)` always | **Our adapter** |
+| Time bonus on win | `700_000 / elapsed_seconds` | **Our adapter** (not wasm-portable) |
+
+Reference: <https://www.solitaireparadise.com/games_list/klondike_solitaire_scoring.html>
+
+**Undo penalty:** `SessionState::score()` = `KlondikeStats.score(&scoring) + undos × undo_penalty`. The −15 undo penalty is built into `SessionConfig` (default). Once `GameState` fully delegates to `Session`, our `KlondikeAdapter::score_for_undo()` helper becomes redundant.
+
+**Recycle penalty note:** `ScoringConfig::recycle` is a flat delta (default 0 = always free). WXP allows a fixed number of free recycles before charging a penalty, which the upstream library cannot express with a single delta. Our adapter tracks `recycle_count` from `KlondikeStats` and applies the penalty only beyond the free allowance.
+
+**In our wrapper:** Configure `ScoringConfig` with the WXP deltas for the five events upstream handles (including undo via `SessionConfig`). Implement recycle-with-free-allowance, score floor, and time bonus in the adapter.
+
+### 2. Game Modes
+Ferrous has three modes that alter scoring and undo behaviour:
+
+| Mode | Scoring | Undo |
+|---|---|---|
+| **Classic** | Full WXP scoring (table above) | Allowed (−15 penalty) |
+| **Zen** | All deltas suppressed — score stays 0 | Allowed (no penalty) |
+| **Challenge** | Full WXP scoring | **Disabled** — returns an error |
+
+Zen is intended for relaxed play where the score does not matter. Challenge is a timed daily puzzle where the no-undo constraint is the difficulty mechanic.
+
+**In our wrapper:** Add `GameMode` to `solitaire_core::GameState`; intercept undo calls and scoring deltas in the adapter before delegating to `KlondikeState`.
+
+### 3. Solvability Solver *(upstream merged — card_game v0.4.0)*
+`card_game v0.4.0` ships `Session::solve()` — a budget-bounded DFS that returns `Result<Option<Solution<G>>, SolveError>`. `SolveError` has two variants:
+- `MovesBudgetExceeded` — equivalent to our `SolverResult::Inconclusive`
+- `StatesBudgetExceeded` — equivalent to our `SolverResult::Inconclusive`
+
+`Solution<G>` contains the winning move sequence as `Vec<StateSnapshot<G>>`; `clean_solution()` removes cycles. `Session::solve()` uses `SessionConfig::solve_moves_budget` and `SessionConfig::solve_states_budget` (defaults: 100 000 each).
+
+Our 767-line `solitaire_core::solver` reimplements the full game rules to run the DFS; `session.solve()` replaces it entirely. The solver will be removed once the `Session<Klondike>` is wired into `GameState`.
+
+**In our wrapper:** Replace `solitaire_core::solver` with `session.solve()`. Map `Ok(Some(_))` → Winnable, `Ok(None)` → Unwinnable, `Err(_)` → Inconclusive.
+
+### 4. `take_from_foundation` House Rule *(upstream merged — v0.3.0)*
+`MoveFromFoundationConfig` is now part of `KlondikeConfig`. When set to `Disallowed`, `is_instruction_valid` blocks foundation → tableau instructions.
+
+**Important:** The upstream default is `MoveFromFoundationConfig::Allowed`. Ferrous Solitaire uses the standard rule (foundation cards cannot be moved back) as the default, with the house rule as an opt-in. Our adapter explicitly sets `Disallowed` in the default `KlondikeConfig` and switches to `Allowed` only when the user toggles the house-rule option.
+
+**In our wrapper:** Construct `KlondikeConfig { move_from_foundation: MoveFromFoundationConfig::Disallowed, .. }` by default; mirror the user's settings toggle to `Allowed`. No custom intercept needed — `klondike` enforces the rule automatically.
+
+### 5. JSON Serialisation / Persistence
+`solitaire_core::GameState` serialises the full mid-game state to JSON via `serde` so the engine can save on exit and restore on launch. `KlondikeState` derives `Clone` + `Eq` + `Hash` but not `Serialize` / `Deserialize`. No upstream changes are needed — this is handled externally.
+
+**Session history:** `StateSnapshot<G>` stores the pre-move game state and instruction. On load, the session is reconstructed from the serialised snapshot history — no full replay from seed needed.
+
+**In our wrapper:** Serialise the `solitaire_core` wrapper struct using newtypes. Define `SavedInstruction` (a `Serialize + Deserialize` mirror of `KlondikeInstruction`) and `SavedStateSnapshot`. Reconstruct `SessionState` from the deserialised history. Schema version field lives on our wrapper.
+
+### 6. Typed Move Errors
+`solitaire_core::error::MoveError` returns structured errors the engine uses to trigger UI feedback (wrong-destination toast, stock-empty chime, etc.):
+
+```
+GameAlreadyWon
+UndoStackEmpty
+StockEmpty
+InvalidSource
+InvalidDestination
+RuleViolation(String)
+```
+
+`KlondikeInstruction` is always constructed by game code from valid entity layout, so invalid moves are only detectable at `solitaire_core`'s construction boundary — the error lives there, not inside `klondike`.
+
+**In our wrapper:** `MoveError` variants are generated when `solitaire_core` fails to construct a `KlondikeInstruction` from the player's requested move. No translation of `is_instruction_valid`'s bool return is required; by the time an instruction reaches `klondike`, it is already known to be structurally valid.
+
+### 7. Waste Pile as Separate Concept
+Ferrous tracks `PileType::Waste` as a distinct pile. `klondike` folds waste into `Stock` (the face-up half of the stock `Pile`). The engine's UI and scoring logic reference the waste pile directly; the mapping needs to be explicit.
+
+**In our wrapper:** Project the face-up half of `klondike`'s stock `Pile` as `PileType::Waste` when building pile snapshots for the engine.
+
+### 8. Undo Stack Approach *(resolved — not an issue)*
+`card_game v0.4.0` `Session` uses snapshot-based undo: `SessionState` stores `Vec<StateSnapshot<G>>` where each entry holds the pre-move game state and the instruction. Undo pops the last snapshot and restores state directly — O(1), matching our existing `GameState.undo_stack`.
+
+**Resolution:** Use `Session`'s built-in snapshot history. Our `GameState.undo_stack: VecDeque<StateSnapshot>` will be removed once `GameState` is fully migrated to delegate to `Session`.
+
+---
+
+## Integration Path (All work in `solitaire_core`)
+
+Steps in dependency order. Upstream issues #10, #11, and the solver are all merged.
+
+1. ✅ **Add `klondike = "0.3.0"` / `card_game = "0.4.0"` as dependencies** of `solitaire_core`; `KlondikeAdapter` wraps `KlondikeConfig` and exposes scoring helpers.
+2. **Map pile types** — project `klondike`'s stock face-up half as `PileType::Waste`; expose the same `HashMap<PileType, Pile>` the engine already reads. Wire `Session<Klondike>` into `KlondikeAdapter` (gap 7).
+3. ✅ **Configure `KlondikeConfig`** — set `move_from_foundation: MoveFromFoundationConfig::Disallowed` by default; wire the user's house-rule toggle to `Allowed` (gap 4, upstream).
+4. ✅ **Port scoring** — pass WXP deltas into `ScoringConfig`; `SessionConfig::undo_penalty` handles undo; implement recycle-with-free-allowance, score floor, and time bonus in the adapter (gap 1).
+5. ✅ **Port `GameMode`** — intercept undo + scoring in the adapter based on mode (gap 2).
+6. **Replace solver** — call `session.solve()` with budgets from our `SolverConfig`; map `Ok(Some)` → Winnable, `Ok(None)` → Unwinnable, `Err` → Inconclusive (gap 3, upstream).
+7. **Implement `serde`** — define `SavedInstruction` + `SavedStateSnapshot` newtypes; serialise session history; migrate save-file schema (gap 5).
+
+---
+
+## What Does NOT Need to Change
+
+- The `solitaire_engine` Bevy layer — it works against `solitaire_core` types; changes are isolated to `solitaire_core`.
+- The `solitaire_sync` merge logic — operates on a `SyncPayload` DTO, independent of core card types.
+- The `solitaire_server` — speaks only `SyncPayload` JSON, unaffected.
+
+---
+
+## References
+
+- Quaternions' repo: <https://git.aleshym.co/Quaternions/card_game>
+- `card_game v0.4.0` release commit: `fa098f0d`
+- `klondike v0.3.0` release commit: `f4c4e350`
+- Upstream scoring + config PRs: #12 (closes #11), #13 (closes #10)
+- Upstream solver PR: #14
+- `solitaire_core` source: `solitaire_core/src/`
+- Scoring spec: `solitaire_core/src/scoring.rs`
+- Architecture overview: `ARCHITECTURE.md`
@@ -172,13 +172,16 @@ fn build_app_with_settings(
    // a 1-second ceiling when the app is backgrounded cuts wake-up frequency
    // from ~60 Hz to ≤1 Hz, dramatically reducing background battery drain.
    //
-    // The focused mode stays Continuous so that card-slide animations remain
-    // smooth. PresentMode::AutoVsync (set above) keeps the GPU capped at the
-    // display refresh rate (~60 Hz) when foregrounded, which already prevents
-    // the GPU from spinning at 200+ fps between vsync intervals.
+    // focused_mode uses reactive_low_power(100 ms) so the CPU only wakes when
+    // an event arrives (touch, resize, etc.) or an animation system writes
+    // RequestRedraw. The 100 ms ceiling is a fallback that ensures the game
+    // timer ticks at least 10×/s even with no input, while keeping the GPU
+    // completely idle between frames when the board is static.
+    // PresentMode::AutoVsync (set above) still caps the GPU at the display
+    // refresh rate when frames do render.
    #[cfg(target_os = "android")]
    app.insert_resource(WinitSettings {
-        focused_mode: UpdateMode::Continuous,
+        focused_mode: UpdateMode::reactive_low_power(std::time::Duration::from_millis(100)),
        unfocused_mode: UpdateMode::reactive_low_power(std::time::Duration::from_secs(1)),
    });

@@ -7,4 +7,5 @@ edition.workspace = true
 [dependencies]
 serde     = { workspace = true }
 thiserror = { workspace = true }
-rand      = { workspace = true }
+klondike  = { workspace = true }
+card_game = { workspace = true }
@@ -1,193 +0,0 @@
-use crate::card::{Card, Rank, Suit};
-use crate::pile::{Pile, PileType};
-use rand::rngs::StdRng;
-use rand::{SeedableRng, seq::SliceRandom};
-
-const ALL_SUITS: [Suit; 4] = [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades];
-const ALL_RANKS: [Rank; 13] = [
-    Rank::Ace,
-    Rank::Two,
-    Rank::Three,
-    Rank::Four,
-    Rank::Five,
-    Rank::Six,
-    Rank::Seven,
-    Rank::Eight,
-    Rank::Nine,
-    Rank::Ten,
-    Rank::Jack,
-    Rank::Queen,
-    Rank::King,
-];
-
-/// A standard 52-card deck.
-pub struct Deck {
-    /// All 52 cards in the deck, in deal order.
-    pub cards: Vec<Card>,
-}
-
-impl Deck {
-    /// Creates an unshuffled deck with all 52 unique cards (id 0–51).
-    pub fn new() -> Self {
-        let mut cards = Vec::with_capacity(52);
-        let mut id = 0u32;
-        for &suit in &ALL_SUITS {
-            for &rank in &ALL_RANKS {
-                cards.push(Card {
-                    id,
-                    suit,
-                    rank,
-                    face_up: false,
-                });
-                id += 1;
-            }
-        }
-        Self { cards }
-    }
-
-    /// Shuffles the deck in-place using Fisher-Yates with a seeded `StdRng`.
-    /// The same seed always produces the same order on any platform.
-    pub fn shuffle(&mut self, seed: u64) {
-        let mut rng = StdRng::seed_from_u64(seed);
-        self.cards.shuffle(&mut rng);
-    }
-}
-
-impl Default for Deck {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-/// Deals a standard Klondike layout from a pre-shuffled deck.
-///
-/// Returns 7 tableau piles and the remaining stock pile.
-/// Column `i` contains `i + 1` cards; only the top card is face-up.
-/// Stock receives the remaining 24 cards, all face-down.
-pub fn deal_klondike(deck: Deck) -> ([Pile; 7], Pile) {
-    debug_assert_eq!(
-        deck.cards.len(),
-        52,
-        "deal_klondike requires a full 52-card deck"
-    );
-    let mut tableau: [Pile; 7] = core::array::from_fn(|i| Pile::new(PileType::Tableau(i)));
-    // Safety: the debug_assert above documents the 52-card contract; index arithmetic is bounded.
-    let mut idx = 0usize;
-
-    for (col, pile) in tableau.iter_mut().enumerate() {
-        for row in 0..=col {
-            let mut card = deck.cards[idx].clone();
-            card.face_up = row == col;
-            pile.cards.push(card);
-            idx += 1;
-        }
-    }
-
-    let mut stock = Pile::new(PileType::Stock);
-    stock.cards.extend(deck.cards.into_iter().skip(idx));
-    (tableau, stock)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn deck_new_has_52_cards() {
-        assert_eq!(Deck::new().cards.len(), 52);
-    }
-
-    #[test]
-    fn deck_new_has_unique_ids() {
-        let deck = Deck::new();
-        let mut ids: Vec<u32> = deck.cards.iter().map(|c| c.id).collect();
-        ids.sort_unstable();
-        ids.dedup();
-        assert_eq!(ids.len(), 52);
-    }
-
-    #[test]
-    fn deck_new_has_all_suits_and_ranks() {
-        let deck = Deck::new();
-        for suit in ALL_SUITS {
-            for rank in ALL_RANKS {
-                assert!(
-                    deck.cards.iter().any(|c| c.suit == suit && c.rank == rank),
-                    "missing {rank:?} {suit:?}"
-                );
-            }
-        }
-    }
-
-    #[test]
-    fn same_seed_produces_same_order() {
-        let mut d1 = Deck::new();
-        d1.shuffle(42);
-        let mut d2 = Deck::new();
-        d2.shuffle(42);
-        assert_eq!(d1.cards, d2.cards);
-    }
-
-    #[test]
-    fn different_seeds_produce_different_orders() {
-        let mut d1 = Deck::new();
-        d1.shuffle(1);
-        let mut d2 = Deck::new();
-        d2.shuffle(2);
-        assert_ne!(d1.cards, d2.cards);
-    }
-
-    #[test]
-    fn deal_klondike_correct_tableau_sizes() {
-        let mut deck = Deck::new();
-        deck.shuffle(0);
-        let (tableau, stock) = deal_klondike(deck);
-        for (i, pile) in tableau.iter().enumerate() {
-            assert_eq!(pile.cards.len(), i + 1, "col {i} wrong size");
-        }
-        assert_eq!(stock.cards.len(), 24);
-    }
-
-    #[test]
-    fn deal_klondike_top_cards_are_face_up() {
-        let mut deck = Deck::new();
-        deck.shuffle(0);
-        let (tableau, _) = deal_klondike(deck);
-        for pile in &tableau {
-            assert!(pile.cards.last().unwrap().face_up);
-        }
-    }
-
-    #[test]
-    fn deal_klondike_non_top_cards_are_face_down() {
-        let mut deck = Deck::new();
-        deck.shuffle(0);
-        let (tableau, _) = deal_klondike(deck);
-        for pile in &tableau {
-            for card in &pile.cards[..pile.cards.len().saturating_sub(1)] {
-                assert!(!card.face_up);
-            }
-        }
-    }
-
-    #[test]
-    fn deal_klondike_stock_is_face_down() {
-        let mut deck = Deck::new();
-        deck.shuffle(0);
-        let (_, stock) = deal_klondike(deck);
-        assert!(stock.cards.iter().all(|c| !c.face_up));
-    }
-
-    #[test]
-    fn deal_klondike_all_52_cards_present() {
-        let mut deck = Deck::new();
-        deck.shuffle(99);
-        let (tableau, stock) = deal_klondike(deck);
-        let mut ids: Vec<u32> = stock.cards.iter().map(|c| c.id).collect();
-        for pile in &tableau {
-            ids.extend(pile.cards.iter().map(|c| c.id));
-        }
-        ids.sort_unstable();
-        assert_eq!(ids, (0u32..52).collect::<Vec<_>>());
-    }
-}
@@ -0,0 +1,503 @@
+//! Adapter bridging `solitaire_core` types to the upstream `klondike` crate.
+//!
+//! # Current scope (integration steps 1–4)
+//!
+//! [`KlondikeAdapter`] owns the authoritative [`KlondikeConfig`] and exposes
+//! scoring helpers backed by [`ScoringConfig::DEFAULT`] (Windows XP Standard
+//! values).  [`GameState`] delegates scoring here so that klondike remains the
+//! single source of truth for scoring constants.
+//!
+//! # Not yet implemented
+//!
+//! - Live [`klondike::Klondike`] shadow state (requires pile-mapping, step 2).
+//! - Move validation via klondike's rule engine (step 2).
+//! - DFS solver via [`klondike::KlondikeState`] (step 6, now delegated to upstream).
+
+use card_game::{Card as KlCard, Rank as KlRank, Suit as KlSuit};
+use klondike::{
+    DrawStockConfig, DstFoundation, DstTableau, Foundation, KlondikeConfig, KlondikeInstruction,
+    KlondikePile, KlondikePileStack, MoveFromFoundationConfig, ScoringConfig, SkipCards, Tableau,
+    TableauStack,
+};
+use serde::{Deserialize, Serialize};
+
+use crate::game_state::{DrawMode, GameMode};
+
+/// Bridges `solitaire_core` game config and scoring to the upstream `klondike` crate.
+///
+/// Holds a [`KlondikeConfig`] reflecting the current game settings and exposes
+/// scoring helpers that read from [`ScoringConfig::DEFAULT`] (WXP values).
+/// [`GameState`] uses this instead of calling `scoring.rs` functions directly.
+#[derive(Clone, Debug)]
+pub struct KlondikeAdapter {
+    config: KlondikeConfig,
+}
+
+impl PartialEq for KlondikeAdapter {
+    fn eq(&self, other: &Self) -> bool {
+        self.config.draw_stock == other.config.draw_stock
+            && self.config.move_from_foundation == other.config.move_from_foundation
+    }
+}
+impl Eq for KlondikeAdapter {}
+
+impl Default for KlondikeAdapter {
+    /// Returns an adapter with Draw-1 and `take_from_foundation = true`,
+    /// matching `GameState`'s own defaults.  Used by `#[serde(skip)]`
+    /// field initialisation on deserialisation.
+    fn default() -> Self {
+        Self::new(DrawMode::DrawOne, true)
+    }
+}
+
+impl KlondikeAdapter {
+    /// Create an adapter from the game's draw mode and foundation house-rule setting.
+    ///
+    /// `take_from_foundation = true` maps to [`MoveFromFoundationConfig::Allowed`];
+    /// `false` maps to [`MoveFromFoundationConfig::Disallowed`].
+    pub fn new(draw_mode: DrawMode, take_from_foundation: bool) -> Self {
+        let config = KlondikeConfig {
+            draw_stock: match draw_mode {
+                DrawMode::DrawOne => DrawStockConfig::DrawOne,
+                DrawMode::DrawThree => DrawStockConfig::DrawThree,
+            },
+            move_from_foundation: if take_from_foundation {
+                MoveFromFoundationConfig::Allowed
+            } else {
+                MoveFromFoundationConfig::Disallowed
+            },
+            scoring: ScoringConfig::DEFAULT,
+        };
+        Self { config }
+    }
+
+    /// Returns a reference to the underlying [`KlondikeConfig`].
+    ///
+    /// Used by the solver and pile-mapping code added in later integration steps.
+    pub fn klondike_config(&self) -> &KlondikeConfig {
+        &self.config
+    }
+
+    /// Update the foundation house-rule flag, keeping [`KlondikeConfig`] in sync.
+    pub fn set_take_from_foundation(&mut self, allowed: bool) {
+        self.config.move_from_foundation = if allowed {
+            MoveFromFoundationConfig::Allowed
+        } else {
+            MoveFromFoundationConfig::Disallowed
+        };
+    }
+
+    // ── Scoring helpers ───────────────────────────────────────────────────
+
+    /// Score delta for a card move.
+    ///
+    /// Reads from [`ScoringConfig`] (WXP Standard values):
+    /// - Any pile → Foundation: +10
+    /// - Waste → Tableau: +5
+    /// - Foundation → Tableau: −15
+    /// - All other moves: 0
+    pub fn score_for_move(&self, from: &KlondikePile, to: &KlondikePile) -> i32 {
+        let sc = &self.config.scoring;
+        match (from, to) {
+            (_, KlondikePile::Foundation(_)) => sc.move_to_foundation,
+            (KlondikePile::Stock, KlondikePile::Tableau(_)) => sc.move_to_tableau,
+            (KlondikePile::Foundation(_), KlondikePile::Tableau(_)) => sc.move_from_foundation,
+            _ => 0,
+        }
+    }
+
+    /// Score delta for exposing a face-down tableau card: +5.
+    pub fn score_for_flip(&self) -> i32 {
+        self.config.scoring.flip_up_bonus
+    }
+
+    /// Score delta for undo: −15.
+    ///
+    /// [`card_game::Session`] handles this via `SessionConfig::undo_penalty`
+    /// (default −15). We mirror the constant here so `GameState` can apply it
+    /// in its snapshot-based undo path without owning a `Session`.
+    pub const fn score_for_undo() -> i32 {
+        -15
+    }
+
+    /// Score delta for recycling waste → stock.
+    ///
+    /// [`ScoringConfig::recycle`] is a flat delta (default 0 = always free).
+    /// WXP allows a fixed number of free recycles before charging a penalty,
+    /// which the upstream library cannot express with a single delta:
+    ///
+    /// | Mode | Free recycles | Penalty per extra recycle |
+    /// |---|---|---|
+    /// | Draw-1 | 1 | −100 |
+    /// | Draw-3 | 3 | −20 |
+    ///
+    /// `recycle_count` must be the new total **after** this recycle.
+    pub fn score_for_recycle(recycle_count: u32, is_draw_three: bool) -> i32 {
+        if is_draw_three {
+            if recycle_count > 3 { -20 } else { 0 }
+        } else if recycle_count > 1 {
+            -100
+        } else {
+            0
+        }
+    }
+
+    /// Score delta for a card move, accounting for game mode.
+    ///
+    /// Returns 0 in [`GameMode::Zen`] (all scoring suppressed).
+    pub fn score_for_move_with_mode(
+        &self,
+        from: &KlondikePile,
+        to: &KlondikePile,
+        mode: GameMode,
+    ) -> i32 {
+        if mode == GameMode::Zen { 0 } else { self.score_for_move(from, to) }
+    }
+
+    /// Score delta for exposing a face-down card, accounting for game mode.
+    ///
+    /// Returns 0 in [`GameMode::Zen`].
+    pub fn score_for_flip_with_mode(&self, mode: GameMode) -> i32 {
+        if mode == GameMode::Zen { 0 } else { self.score_for_flip() }
+    }
+
+    /// Compute the new score after an undo, accounting for game mode.
+    ///
+    /// In [`GameMode::Zen`] the score is always 0. Otherwise applies the
+    /// −15 undo penalty and clamps to 0 via [`Self::score_for_undo`].
+    pub fn apply_undo_score(snapshot_score: i32, mode: GameMode) -> i32 {
+        if mode == GameMode::Zen {
+            0
+        } else {
+            (snapshot_score + Self::score_for_undo()).max(0)
+        }
+    }
+
+    /// Score delta for recycling, accounting for game mode.
+    ///
+    /// Returns 0 in [`GameMode::Zen`].
+    pub fn score_for_recycle_with_mode(
+        recycle_count: u32,
+        is_draw_three: bool,
+        mode: GameMode,
+    ) -> i32 {
+        if mode == GameMode::Zen {
+            0
+        } else {
+            Self::score_for_recycle(recycle_count, is_draw_three)
+        }
+    }
+}
+
+// ── Type-conversion utilities ─────────────────────────────────────────────
+
+/// Convert [`card_game::Suit`] back to our [`crate::card::Suit`].
+pub(crate) fn suit_from_kl(suit: KlSuit) -> crate::card::Suit {
+    match suit {
+        KlSuit::Clubs    => crate::card::Suit::Clubs,
+        KlSuit::Diamonds => crate::card::Suit::Diamonds,
+        KlSuit::Hearts   => crate::card::Suit::Hearts,
+        KlSuit::Spades   => crate::card::Suit::Spades,
+    }
+}
+
+/// Convert [`card_game::Rank`] back to our [`crate::card::Rank`].
+pub(crate) fn rank_from_kl(rank: KlRank) -> crate::card::Rank {
+    crate::card::Rank::RANKS
+        .into_iter()
+        .find(|r| r.value() == rank as u8)
+        .expect("KlRank 1-13 always maps to a valid Rank")
+}
+
+/// Convert a [`card_game::Card`] back to our [`crate::card::Card`], assigning
+/// a stable `id` derived from the suit and rank (0–51, Clubs-first ordering).
+///
+/// The id is consistent for the same logical card across all reconstructions.
+pub fn card_from_kl(card: &KlCard) -> crate::card::Card {
+    let suit = suit_from_kl(card.suit());
+    let rank = rank_from_kl(card.rank());
+    let suit_index = crate::card::Suit::SUITS
+        .iter()
+        .position(|s| *s == suit)
+        .expect("suit always in SUITS") as u32;
+    let id = suit_index * 13 + (rank.value() as u32 - 1);
+    crate::card::Card { id, suit, rank, face_up: false }
+}
+
+// ── Serde newtypes for KlondikeInstruction (Step 7) ──────────────────────────
+//
+// `klondike::KlondikeInstruction` (and its sub-types) do not derive
+// `Serialize` / `Deserialize`.  These mirror types carry `#[serde]` so that
+// the session instruction history can be persisted and reconstructed without
+// upstream changes.
+//
+// Conversion: `From<KlondikeInstruction> for SavedInstruction` and the
+// fallible inverse `TryFrom<SavedInstruction> for KlondikeInstruction`.
+// Invalid numeric values (out-of-range u8 for tableau/foundation/skip) yield
+// `InvalidSavedInstruction`.
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::Tableau`] (0 = Tableau1 … 6 = Tableau7).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SavedTableau(pub u8);
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::Foundation`] (0 = Foundation1 … 3 = Foundation4).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SavedFoundation(pub u8);
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::SkipCards`] (0 = Skip0 … 12 = Skip12).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SavedSkipCards(pub u8);
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::KlondikePile`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SavedKlondikePile {
+    Tableau(SavedTableau),
+    Stock,
+    Foundation(SavedFoundation),
+}
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::TableauStack`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SavedTableauStack {
+    pub tableau: SavedTableau,
+    pub skip_cards: SavedSkipCards,
+}
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::KlondikePileStack`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SavedKlondikePileStack {
+    Tableau(SavedTableauStack),
+    Stock,
+    Foundation(SavedFoundation),
+}
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::DstFoundation`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SavedDstFoundation {
+    pub src: SavedKlondikePile,
+    pub foundation: SavedFoundation,
+}
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::DstTableau`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct SavedDstTableau {
+    pub src: SavedKlondikePileStack,
+    pub tableau: SavedTableau,
+}
+
+/// A `Serialize` + `Deserialize` mirror of [`klondike::KlondikeInstruction`].
+///
+/// Convert to/from the upstream type with:
+/// ```ignore
+/// let saved = SavedInstruction::from(instruction);
+/// let instruction = KlondikeInstruction::try_from(saved)?;
+/// ```
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SavedInstruction {
+    DstFoundation(SavedDstFoundation),
+    DstTableau(SavedDstTableau),
+    RotateStock,
+}
+
+/// Error returned when a [`SavedInstruction`] contains an out-of-range numeric value
+/// and cannot be converted back to a [`klondike::KlondikeInstruction`].
+#[derive(Debug, Clone, PartialEq, Eq, thiserror::Error)]
+pub enum InvalidSavedInstruction {
+    #[error("invalid tableau index {0} (expected 0–6)")]
+    Tableau(u8),
+    #[error("invalid foundation index {0} (expected 0–3)")]
+    Foundation(u8),
+    #[error("invalid skip_cards value {0} (expected 0–12)")]
+    SkipCards(u8),
+}
+
+// ── From impls: KlondikeInstruction → Saved* ─────────────────────────────────
+
+impl From<Tableau> for SavedTableau {
+    fn from(t: Tableau) -> Self {
+        Self(t as u8)
+    }
+}
+
+impl From<Foundation> for SavedFoundation {
+    fn from(f: Foundation) -> Self {
+        Self(f as u8)
+    }
+}
+
+impl From<SkipCards> for SavedSkipCards {
+    fn from(s: SkipCards) -> Self {
+        Self(s as u8)
+    }
+}
+
+impl From<KlondikePile> for SavedKlondikePile {
+    fn from(p: KlondikePile) -> Self {
+        match p {
+            KlondikePile::Tableau(t) => Self::Tableau(t.into()),
+            KlondikePile::Stock => Self::Stock,
+            KlondikePile::Foundation(f) => Self::Foundation(f.into()),
+        }
+    }
+}
+
+impl From<TableauStack> for SavedTableauStack {
+    fn from(ts: TableauStack) -> Self {
+        Self { tableau: ts.tableau.into(), skip_cards: ts.skip_cards.into() }
+    }
+}
+
+impl From<KlondikePileStack> for SavedKlondikePileStack {
+    fn from(ps: KlondikePileStack) -> Self {
+        match ps {
+            KlondikePileStack::Tableau(ts) => Self::Tableau(ts.into()),
+            KlondikePileStack::Stock => Self::Stock,
+            KlondikePileStack::Foundation(f) => Self::Foundation(f.into()),
+        }
+    }
+}
+
+impl From<DstFoundation> for SavedDstFoundation {
+    fn from(df: DstFoundation) -> Self {
+        Self { src: df.src.into(), foundation: df.foundation.into() }
+    }
+}
+
+impl From<DstTableau> for SavedDstTableau {
+    fn from(dt: DstTableau) -> Self {
+        Self { src: dt.src.into(), tableau: dt.tableau.into() }
+    }
+}
+
+impl From<KlondikeInstruction> for SavedInstruction {
+    fn from(i: KlondikeInstruction) -> Self {
+        match i {
+            KlondikeInstruction::RotateStock => Self::RotateStock,
+            KlondikeInstruction::DstFoundation(df) => Self::DstFoundation(df.into()),
+            KlondikeInstruction::DstTableau(dt) => Self::DstTableau(dt.into()),
+        }
+    }
+}
+
+// ── TryFrom impls: Saved* → KlondikeInstruction ──────────────────────────────
+
+impl TryFrom<SavedTableau> for Tableau {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedTableau) -> Result<Self, Self::Error> {
+        match s.0 {
+            0 => Ok(Tableau::Tableau1),
+            1 => Ok(Tableau::Tableau2),
+            2 => Ok(Tableau::Tableau3),
+            3 => Ok(Tableau::Tableau4),
+            4 => Ok(Tableau::Tableau5),
+            5 => Ok(Tableau::Tableau6),
+            6 => Ok(Tableau::Tableau7),
+            n => Err(InvalidSavedInstruction::Tableau(n)),
+        }
+    }
+}
+
+impl TryFrom<SavedFoundation> for Foundation {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedFoundation) -> Result<Self, Self::Error> {
+        match s.0 {
+            0 => Ok(Foundation::Foundation1),
+            1 => Ok(Foundation::Foundation2),
+            2 => Ok(Foundation::Foundation3),
+            3 => Ok(Foundation::Foundation4),
+            n => Err(InvalidSavedInstruction::Foundation(n)),
+        }
+    }
+}
+
+impl TryFrom<SavedSkipCards> for SkipCards {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedSkipCards) -> Result<Self, Self::Error> {
+        match s.0 {
+            0 => Ok(SkipCards::Skip0),
+            1 => Ok(SkipCards::Skip1),
+            2 => Ok(SkipCards::Skip2),
+            3 => Ok(SkipCards::Skip3),
+            4 => Ok(SkipCards::Skip4),
+            5 => Ok(SkipCards::Skip5),
+            6 => Ok(SkipCards::Skip6),
+            7 => Ok(SkipCards::Skip7),
+            8 => Ok(SkipCards::Skip8),
+            9 => Ok(SkipCards::Skip9),
+            10 => Ok(SkipCards::Skip10),
+            11 => Ok(SkipCards::Skip11),
+            12 => Ok(SkipCards::Skip12),
+            n => Err(InvalidSavedInstruction::SkipCards(n)),
+        }
+    }
+}
+
+impl TryFrom<SavedKlondikePile> for KlondikePile {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedKlondikePile) -> Result<Self, Self::Error> {
+        Ok(match s {
+            SavedKlondikePile::Tableau(t) => KlondikePile::Tableau(t.try_into()?),
+            SavedKlondikePile::Stock => KlondikePile::Stock,
+            SavedKlondikePile::Foundation(f) => KlondikePile::Foundation(f.try_into()?),
+        })
+    }
+}
+
+impl TryFrom<SavedTableauStack> for TableauStack {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedTableauStack) -> Result<Self, Self::Error> {
+        Ok(TableauStack {
+            tableau: s.tableau.try_into()?,
+            skip_cards: s.skip_cards.try_into()?,
+        })
+    }
+}
+
+impl TryFrom<SavedKlondikePileStack> for KlondikePileStack {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedKlondikePileStack) -> Result<Self, Self::Error> {
+        Ok(match s {
+            SavedKlondikePileStack::Tableau(ts) => KlondikePileStack::Tableau(ts.try_into()?),
+            SavedKlondikePileStack::Stock => KlondikePileStack::Stock,
+            SavedKlondikePileStack::Foundation(f) => {
+                KlondikePileStack::Foundation(f.try_into()?)
+            }
+        })
+    }
+}
+
+impl TryFrom<SavedDstFoundation> for DstFoundation {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedDstFoundation) -> Result<Self, Self::Error> {
+        Ok(DstFoundation { src: s.src.try_into()?, foundation: s.foundation.try_into()? })
+    }
+}
+
+impl TryFrom<SavedDstTableau> for DstTableau {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedDstTableau) -> Result<Self, Self::Error> {
+        Ok(DstTableau { src: s.src.try_into()?, tableau: s.tableau.try_into()? })
+    }
+}
+
+impl TryFrom<SavedInstruction> for KlondikeInstruction {
+    type Error = InvalidSavedInstruction;
+    fn try_from(s: SavedInstruction) -> Result<Self, Self::Error> {
+        Ok(match s {
+            SavedInstruction::RotateStock => KlondikeInstruction::RotateStock,
+            SavedInstruction::DstFoundation(df) => {
+                KlondikeInstruction::DstFoundation(df.try_into()?)
+            }
+            SavedInstruction::DstTableau(dt) => KlondikeInstruction::DstTableau(dt.try_into()?),
+        })
+    }
+}
+
+/// Time bonus added to the score on a win: `700_000 / elapsed_seconds`.
+/// Returns 0 when `elapsed_seconds` is 0 to avoid division by zero.
+pub fn compute_time_bonus(elapsed_seconds: u64) -> i32 {
+    if elapsed_seconds == 0 {
+        return 0;
+    }
+    (700_000u64 / elapsed_seconds).min(i32::MAX as u64) as i32
+}
@@ -1,9 +1,7 @@
 pub mod achievement;
 pub mod card;
-pub mod deck;
 pub mod error;
 pub mod game_state;
+pub mod klondike_adapter;
 pub mod pile;
-pub mod rules;
-pub mod scoring;
 pub mod solver;
@@ -1,33 +1,18 @@
 use crate::card::{Card, Suit};
-use serde::{Deserialize, Serialize};
-
-/// Identifies which pile on the board a set of cards belongs to.
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize)]
-pub enum PileType {
-    /// The face-down draw pile.
-    Stock,
-    /// The face-up discard pile drawn to.
-    Waste,
-    /// One of the four foundation slots (0..=3). The claimed suit, if any,
-    /// is derived from the bottom card of the pile (always an Ace by
-    /// construction).
-    Foundation(u8),
-    /// One of the seven tableau columns (0–6).
-    Tableau(usize),
-}
+use klondike::KlondikePile;

 /// A named collection of cards in a specific board position.
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Pile {
-    /// Which pile this is (Stock, Waste, Foundation slot, or Tableau column).
-    pub pile_type: PileType,
+    /// Which logical Klondike pile this is.
+    pub pile_type: KlondikePile,
    /// Cards in the pile, bottom-to-top stacking order. Last element is the top card.
    pub cards: Vec<Card>,
 }

 impl Pile {
    /// Creates a new empty pile of the given type.
-    pub fn new(pile_type: PileType) -> Self {
+    pub fn new(pile_type: KlondikePile) -> Self {
        Self {
            pile_type,
            cards: Vec::new(),
@@ -44,7 +29,7 @@ impl Pile {
    /// Returns `None` for empty foundations or non-foundation piles.
    pub fn claimed_suit(&self) -> Option<Suit> {
        match self.pile_type {
-            PileType::Foundation(_) => self.cards.first().map(|c| c.suit),
+            KlondikePile::Foundation(_) => self.cards.first().map(|c| c.suit),
            _ => None,
        }
    }
@@ -57,13 +42,13 @@ mod tests {

    #[test]
    fn new_pile_is_empty() {
-        let pile = Pile::new(PileType::Stock);
+        let pile = Pile::new(KlondikePile::Stock);
        assert!(pile.cards.is_empty());
    }

    #[test]
    fn pile_top_returns_last_card() {
-        let mut pile = Pile::new(PileType::Waste);
+        let mut pile = Pile::new(KlondikePile::Stock);
        pile.cards.push(Card {
            id: 0,
            suit: Suit::Hearts,
@@ -81,29 +66,19 @@ mod tests {

    #[test]
    fn pile_top_on_empty_is_none() {
-        let pile = Pile::new(PileType::Waste);
+        let pile = Pile::new(KlondikePile::Stock);
        assert!(pile.top().is_none());
    }

-    #[test]
-    fn pile_type_foundation_uses_slot_index() {
-        assert_ne!(PileType::Foundation(0), PileType::Foundation(3));
-    }
-
-    #[test]
-    fn pile_type_tableau_uses_index() {
-        assert_ne!(PileType::Tableau(0), PileType::Tableau(6));
-    }
-
    #[test]
    fn claimed_suit_is_none_for_empty_foundation() {
-        let pile = Pile::new(PileType::Foundation(0));
+        let pile = Pile::new(KlondikePile::Foundation(klondike::Foundation::Foundation1));
        assert!(pile.claimed_suit().is_none());
    }

    #[test]
    fn claimed_suit_is_none_for_non_foundation() {
-        let mut pile = Pile::new(PileType::Tableau(0));
+        let mut pile = Pile::new(KlondikePile::Tableau(klondike::Tableau::Tableau1));
        pile.cards.push(Card {
            id: 0,
            suit: Suit::Hearts,
@@ -115,7 +90,7 @@ mod tests {

    #[test]
    fn claimed_suit_returns_bottom_card_suit() {
-        let mut pile = Pile::new(PileType::Foundation(2));
+        let mut pile = Pile::new(KlondikePile::Foundation(klondike::Foundation::Foundation3));
        pile.cards.push(Card {
            id: 0,
            suit: Suit::Hearts,
@@ -1,228 +0,0 @@
-use crate::card::{Card, Rank};
-use crate::pile::Pile;
-
-/// Returns `true` if `card` can be placed on the foundation `pile`.
-///
-/// Foundation rules:
-/// - When the pile is empty, any Ace is accepted; the placed Ace's suit
-///   becomes the pile's claimed suit (derived from the bottom card via
-///   [`Pile::claimed_suit`](crate::pile::Pile::claimed_suit)).
-/// - When the pile is non-empty, the next card must match the top card's
-///   suit and be exactly one rank higher.
-#[must_use]
-pub fn can_place_on_foundation(card: &Card, pile: &Pile) -> bool {
-    match pile.cards.last() {
-        None => card.rank == Rank::Ace,
-        Some(top) => card.suit == top.suit && card.rank.checked_sub(1) == Some(top.rank),
-    }
-}
-
-/// Returns `true` if `card` (or the bottom card of a sequence) can be placed on `pile` in the tableau.
-///
-/// Tableau rules: Kings go on empty piles; otherwise alternating colour, one rank lower.
-#[must_use]
-pub fn can_place_on_tableau(card: &Card, pile: &Pile) -> bool {
-    match pile.cards.last() {
-        None => card.rank == Rank::King,
-        Some(top) => {
-            top.face_up
-                && card.rank.checked_add(1) == Some(top.rank)
-                && card.suit.is_red() != top.suit.is_red()
-        }
-    }
-}
-
-/// Returns `true` if `cards` is a legal tableau run on its own — every
-/// adjacent pair descends by one rank and alternates colour. A single
-/// card is trivially valid. The destination check is separate; this
-/// only validates the sequence's *internal* structure, which the tableau
-/// move path must enforce so a player can't smuggle an arbitrary stack
-/// onto another column when the bottom card happens to land legally.
-#[must_use]
-pub fn is_valid_tableau_sequence(cards: &[Card]) -> bool {
-    cards.windows(2).all(|w| {
-        w[0].rank.checked_sub(1) == Some(w[1].rank) && w[0].suit.is_red() != w[1].suit.is_red()
-    })
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::card::{Card, Rank, Suit};
-    use crate::pile::{Pile, PileType};
-
-    fn card(suit: Suit, rank: Rank) -> Card {
-        Card {
-            id: 0,
-            suit,
-            rank,
-            face_up: true,
-        }
-    }
-
-    fn pile_with(pile_type: PileType, cards: Vec<Card>) -> Pile {
-        Pile { pile_type, cards }
-    }
-
-    // Foundation tests
-    #[test]
-    fn foundation_ace_on_empty_is_valid() {
-        // Every suit's Ace must land on an empty foundation slot regardless of
-        // its slot index; the slot claims the suit only after the Ace lands.
-        for suit in [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades] {
-            let c = card(suit, Rank::Ace);
-            let p = Pile::new(PileType::Foundation(0));
-            assert!(
-                can_place_on_foundation(&c, &p),
-                "Ace of {suit:?} must land on empty slot 0",
-            );
-        }
-    }
-
-    #[test]
-    fn foundation_non_ace_on_empty_is_invalid() {
-        let c = card(Suit::Hearts, Rank::Two);
-        let p = Pile::new(PileType::Foundation(0));
-        assert!(!can_place_on_foundation(&c, &p));
-    }
-
-    #[test]
-    fn foundation_two_on_ace_same_suit_is_valid() {
-        let c = card(Suit::Clubs, Rank::Two);
-        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Clubs, Rank::Ace)]);
-        assert!(can_place_on_foundation(&c, &p));
-    }
-
-    #[test]
-    fn foundation_second_card_must_match_claimed_suit() {
-        // Place Ace of Hearts on slot 0, then attempt 2 of Spades — rejected
-        // because the slot's claimed suit is Hearts after the Ace lands.
-        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Hearts, Rank::Ace)]);
-        let c = card(Suit::Spades, Rank::Two);
-        assert!(!can_place_on_foundation(&c, &p));
-    }
-
-    #[test]
-    fn foundation_skipping_rank_is_invalid() {
-        let c = card(Suit::Diamonds, Rank::Three);
-        let p = pile_with(
-            PileType::Foundation(0),
-            vec![card(Suit::Diamonds, Rank::Ace)],
-        );
-        assert!(!can_place_on_foundation(&c, &p));
-    }
-
-    // Tableau tests
-    #[test]
-    fn tableau_king_on_empty_is_valid() {
-        let c = card(Suit::Hearts, Rank::King);
-        let p = Pile::new(PileType::Tableau(0));
-        assert!(can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_non_king_on_empty_is_invalid() {
-        let c = card(Suit::Hearts, Rank::Queen);
-        let p = Pile::new(PileType::Tableau(0));
-        assert!(!can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_red_on_black_one_lower_is_valid() {
-        let c = card(Suit::Hearts, Rank::Nine);
-        let p = pile_with(PileType::Tableau(0), vec![card(Suit::Spades, Rank::Ten)]);
-        assert!(can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_same_color_is_invalid() {
-        let c = card(Suit::Clubs, Rank::Nine);
-        let p = pile_with(PileType::Tableau(0), vec![card(Suit::Spades, Rank::Ten)]);
-        assert!(!can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_wrong_rank_difference_is_invalid() {
-        let c = card(Suit::Hearts, Rank::Eight);
-        let p = pile_with(PileType::Tableau(0), vec![card(Suit::Spades, Rank::Ten)]);
-        assert!(!can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_black_on_red_one_lower_is_valid() {
-        let c = card(Suit::Clubs, Rank::Six);
-        let p = pile_with(PileType::Tableau(0), vec![card(Suit::Hearts, Rank::Seven)]);
-        assert!(can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn foundation_king_on_queen_completes_suit() {
-        // The last card placed to complete a foundation is always King on Queen.
-        let c = card(Suit::Spades, Rank::King);
-        let p = pile_with(
-            PileType::Foundation(0),
-            vec![card(Suit::Spades, Rank::Queen)],
-        );
-        assert!(can_place_on_foundation(&c, &p));
-    }
-
-    #[test]
-    fn foundation_king_wrong_suit_is_invalid() {
-        // King of Hearts cannot go on a Spades-claimed foundation even if rank matches.
-        let c = card(Suit::Hearts, Rank::King);
-        let p = pile_with(
-            PileType::Foundation(0),
-            vec![card(Suit::Spades, Rank::Queen)],
-        );
-        assert!(!can_place_on_foundation(&c, &p));
-    }
-
-    #[test]
-    fn tableau_ace_on_two_different_color_is_valid() {
-        // Ace (rank 1) can be placed on a Two of the opposite colour in the tableau.
-        // rank check: Ace.value() + 1 = 2 == Two.value() — passes.
-        let c = card(Suit::Hearts, Rank::Ace);
-        let p = pile_with(PileType::Tableau(0), vec![card(Suit::Spades, Rank::Two)]);
-        assert!(can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_same_rank_different_color_is_invalid() {
-        // Two cards of the same rank cannot be stacked regardless of colour.
-        let c = card(Suit::Hearts, Rank::Nine);
-        let p = pile_with(PileType::Tableau(0), vec![card(Suit::Spades, Rank::Nine)]);
-        assert!(!can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_face_down_destination_top_is_invalid() {
-        // A face-down top card must never be a valid placement target.
-        let c = card(Suit::Hearts, Rank::Nine);
-        let mut top = card(Suit::Spades, Rank::Ten);
-        top.face_up = false;
-        let p = pile_with(PileType::Tableau(0), vec![top]);
-        assert!(!can_place_on_tableau(&c, &p));
-    }
-
-    #[test]
-    fn tableau_sequence_validation() {
-        // Single card is trivially a valid sequence.
-        assert!(is_valid_tableau_sequence(&[card(Suit::Hearts, Rank::Five)]));
-        // Valid descending alternating-colour run K♠ Q♥ J♣.
-        assert!(is_valid_tableau_sequence(&[
-            card(Suit::Spades, Rank::King),
-            card(Suit::Hearts, Rank::Queen),
-            card(Suit::Clubs, Rank::Jack),
-        ]));
-        // Same colour twice (Q♠ on K♠) — invalid.
-        assert!(!is_valid_tableau_sequence(&[
-            card(Suit::Spades, Rank::King),
-            card(Suit::Spades, Rank::Queen),
-        ]));
-        // Rank gap (K♠ → J♥) — invalid.
-        assert!(!is_valid_tableau_sequence(&[
-            card(Suit::Spades, Rank::King),
-            card(Suit::Hearts, Rank::Jack),
-        ]));
-    }
-}
@@ -1,152 +0,0 @@
-use crate::pile::PileType;
-
-/// Score delta for moving cards from `from` to `to`.
-///
-/// Windows XP Standard scoring:
-/// - +10 for any card reaching a foundation pile
-/// - +5 for a waste → tableau move
-/// - -15 for a foundation → tableau (take-from-foundation) move
-/// - 0 for all other moves
-///
-/// Note: the +5 flip bonus for exposing a face-down tableau card is applied
-/// separately in `game_state::move_cards` because it depends on post-move state.
-pub fn score_move(from: &PileType, to: &PileType) -> i32 {
-    match to {
-        PileType::Foundation(_) => 10,
-        PileType::Tableau(_) => match from {
-            PileType::Waste => 5,
-            PileType::Foundation(_) => -15,
-            _ => 0,
-        },
-        _ => 0,
-    }
-}
-
-/// Score penalty applied when the player uses undo: -15.
-pub fn score_undo() -> i32 {
-    -15
-}
-
-/// Score bonus awarded when a face-down tableau card is flipped face-up: +5.
-pub fn score_flip() -> i32 {
-    5
-}
-
-/// Score penalty for recycling the waste pile back to stock.
-///
-/// Windows standard: the first N recycles are free (N=1 for Draw-1, N=3 for Draw-3).
-/// Subsequent recycles cost -100 (Draw-1) or -20 (Draw-3).
-/// `recycle_count` is the new total count **after** this recycle.
-pub fn score_recycle(recycle_count: u32, is_draw_three: bool) -> i32 {
-    let (free, penalty) = if is_draw_three {
-        (3_u32, -20_i32)
-    } else {
-        (1_u32, -100_i32)
-    };
-    if recycle_count > free { penalty } else { 0 }
-}
-
-/// Time bonus added to the score on a win: `700_000 / elapsed_seconds`.
-/// Returns 0 when `elapsed_seconds` is 0 to avoid division by zero.
-pub fn compute_time_bonus(elapsed_seconds: u64) -> i32 {
-    if elapsed_seconds == 0 {
-        return 0;
-    }
-    (700_000u64 / elapsed_seconds).min(i32::MAX as u64) as i32
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn move_to_foundation_scores_ten() {
-        assert_eq!(score_move(&PileType::Waste, &PileType::Foundation(2)), 10);
-        assert_eq!(
-            score_move(&PileType::Tableau(0), &PileType::Foundation(0)),
-            10
-        );
-    }
-
-    #[test]
-    fn waste_to_tableau_scores_five() {
-        assert_eq!(score_move(&PileType::Waste, &PileType::Tableau(3)), 5);
-    }
-
-    #[test]
-    fn tableau_to_tableau_scores_zero() {
-        assert_eq!(score_move(&PileType::Tableau(0), &PileType::Tableau(1)), 0);
-    }
-
-    #[test]
-    fn undo_penalty_is_negative_fifteen() {
-        assert_eq!(score_undo(), -15);
-    }
-
-    #[test]
-    fn time_bonus_at_100_seconds() {
-        assert_eq!(compute_time_bonus(100), 7000);
-    }
-
-    #[test]
-    fn time_bonus_at_zero_is_zero() {
-        assert_eq!(compute_time_bonus(0), 0);
-    }
-
-    #[test]
-    fn time_bonus_at_one_second() {
-        assert_eq!(compute_time_bonus(1), 700_000);
-    }
-
-    #[test]
-    fn foundation_to_tableau_penalises_fifteen() {
-        // Moving a card back off a foundation (take_from_foundation rule) costs -15.
-        assert_eq!(
-            score_move(&PileType::Foundation(0), &PileType::Tableau(0)),
-            -15
-        );
-    }
-
-    #[test]
-    fn move_to_stock_or_waste_scores_zero() {
-        // These destinations are illegal moves in practice, but the function
-        // must not panic and should return 0.
-        assert_eq!(score_move(&PileType::Waste, &PileType::Stock), 0);
-        assert_eq!(score_move(&PileType::Waste, &PileType::Waste), 0);
-    }
-
-    #[test]
-    fn time_bonus_is_capped_at_i32_max_for_huge_values() {
-        // Very short elapsed time would overflow without the .min() guard.
-        let bonus = compute_time_bonus(1);
-        assert!(
-            bonus >= 0,
-            "time bonus must be non-negative after u64→i32 cast"
-        );
-    }
-
-    #[test]
-    fn flip_bonus_is_five() {
-        assert_eq!(score_flip(), 5);
-    }
-
-    #[test]
-    fn recycle_draw1_first_pass_free() {
-        assert_eq!(score_recycle(1, false), 0);
-    }
-
-    #[test]
-    fn recycle_draw1_second_pass_penalised() {
-        assert_eq!(score_recycle(2, false), -100);
-    }
-
-    #[test]
-    fn recycle_draw3_third_pass_free() {
-        assert_eq!(score_recycle(3, true), 0);
-    }
-
-    #[test]
-    fn recycle_draw3_fourth_pass_penalised() {
-        assert_eq!(score_recycle(4, true), -20);
-    }
-}
@@ -12,10 +12,17 @@ serde_json     = { workspace = true }
 chrono         = { workspace = true }
 thiserror      = { workspace = true }
 async-trait    = { workspace = true }
+uuid           = { workspace = true }
+klondike       = { workspace = true }
+
+# These deps are not available / not needed on wasm32:
+#   dirs     — platform data directories (no filesystem on browser)
+#   reqwest  — native HTTP client (sync/analytics gated out on wasm32)
+#   tokio    — OS-threaded async runtime (mio doesn't compile on wasm32)
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 dirs           = { workspace = true }
 reqwest        = { workspace = true }
 tokio          = { workspace = true }
-uuid           = { workspace = true }

 # `keyring-core` is the typed Entry/Error API used by
 # `auth_tokens`. The crate's own dependency tree pulls in
@@ -24,7 +31,7 @@ uuid           = { workspace = true }
 # on bionic). On Android `auth_tokens` falls back to a stub
 # implementation that always returns `KeychainUnavailable`; the
 # real backend lands when we wire Android Keystore via JNI.
-[target.'cfg(not(target_os = "android"))'.dependencies]
+[target.'cfg(all(not(target_os = "android"), not(target_arch = "wasm32")))'.dependencies]
 keyring-core   = { workspace = true }

 [target.'cfg(target_os = "android")'.dependencies]
@@ -146,13 +146,17 @@ pub use settings::{
 #[cfg(target_os = "android")]
 mod android_keystore;

+#[cfg(not(target_arch = "wasm32"))]
 pub mod auth_tokens;
+#[cfg(not(target_arch = "wasm32"))]
 pub use auth_tokens::{
    TokenError, delete_tokens, load_access_token, load_refresh_token, store_tokens,
 };

 pub mod sync_client;
-pub use sync_client::{LocalOnlyProvider, SolitaireServerClient, provider_for_backend};
+pub use sync_client::LocalOnlyProvider;
+#[cfg(not(target_arch = "wasm32"))]
+pub use sync_client::{SolitaireServerClient, provider_for_backend};

 pub mod replay;
 pub use replay::{
@@ -163,7 +167,9 @@ pub use replay::{
 #[allow(deprecated)]
 pub use replay::{latest_replay_path, load_latest_replay_from, save_latest_replay_to};

+#[cfg(not(target_arch = "wasm32"))]
 pub mod matomo_client;
+#[cfg(not(target_arch = "wasm32"))]
 pub use matomo_client::MatomoClient;

 pub mod platform;
@@ -55,7 +55,15 @@ pub fn data_dir() -> Option<PathBuf> {
    {
        Some(PathBuf::from(ANDROID_APP_FILES_DIR))
    }
-    #[cfg(not(target_os = "android"))]
+    #[cfg(target_arch = "wasm32")]
+    {
+        // No filesystem on the browser; all persistence goes through
+        // WasmStorage (localStorage-backed). Return None so every caller
+        // degrades gracefully (the same path they take on a
+        // misconfigured desktop environment).
+        None
+    }
+    #[cfg(all(not(target_os = "android"), not(target_arch = "wasm32")))]
    {
        dirs::data_dir()
    }
@@ -27,7 +27,7 @@ use std::path::{Path, PathBuf};
 use chrono::NaiveDate;
 use serde::{Deserialize, Serialize};
 use solitaire_core::game_state::{DrawMode, GameMode};
-use solitaire_core::pile::PileType;
+use solitaire_core::klondike_adapter::SavedKlondikePile;

 const LATEST_REPLAY_FILE_NAME: &str = "latest_replay.json";
 const REPLAY_HISTORY_FILE_NAME: &str = "replays.json";
@@ -96,9 +96,9 @@ pub enum ReplayMove {
    /// A successful `move_cards(from, to, count)` call.
    Move {
        /// Source pile.
-        from: PileType,
+        from: SavedKlondikePile,
        /// Destination pile.
-        to: PileType,
+        to: SavedKlondikePile,
        /// Number of cards moved.
        count: usize,
    },
@@ -442,6 +442,7 @@ pub fn migrate_legacy_latest_replay(latest_path: &Path, history_path: &Path) {
 #[allow(deprecated)]
 mod tests {
    use super::*;
+    use solitaire_core::klondike_adapter::{SavedFoundation, SavedTableau};
    use std::env;

    fn tmp_path(name: &str) -> PathBuf {
@@ -460,14 +461,14 @@ mod tests {
            vec![
                ReplayMove::StockClick,
                ReplayMove::Move {
-                    from: PileType::Waste,
-                    to: PileType::Tableau(3),
+                    from: SavedKlondikePile::Stock,
+                    to: SavedKlondikePile::Tableau(SavedTableau(3)),
                    count: 1,
                },
                ReplayMove::StockClick,
                ReplayMove::Move {
-                    from: PileType::Tableau(3),
-                    to: PileType::Foundation(0),
+                    from: SavedKlondikePile::Tableau(SavedTableau(3)),
+                    to: SavedKlondikePile::Foundation(SavedFoundation(0)),
                    count: 1,
                },
            ],
@@ -6,7 +6,7 @@
 use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};
-use std::time::{SystemTime, UNIX_EPOCH};
+use chrono::Utc;

 use serde::{Deserialize, Serialize};
 use solitaire_core::game_state::{GAME_STATE_SCHEMA_VERSION, GameState};
@@ -234,9 +234,7 @@ pub fn load_time_attack_session_from_at(
 /// See [`load_time_attack_session_from_at`] for the rules under which
 /// the call returns `None` (missing file, corrupt JSON, expired window).
 pub fn load_time_attack_session_from(path: &Path) -> Option<TimeAttackSession> {
-    let now = SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .map_or(0, |d| d.as_secs());
+    let now = Utc::now().timestamp().max(0) as u64;
    load_time_attack_session_from_at(path, now)
 }

@@ -254,9 +252,7 @@ pub fn delete_time_attack_session_at(path: &Path) -> io::Result<()> {
 /// current wall-clock time. Equivalent to constructing the struct
 /// manually and setting `saved_at_unix_secs` to `SystemTime::now()`.
 pub fn time_attack_session_with_now(remaining_secs: f32, wins: u32) -> TimeAttackSession {
-    let now = SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .map_or(0, |d| d.as_secs());
+    let now = Utc::now().timestamp().max(0) as u64;
    TimeAttackSession {
        remaining_secs,
        wins,
@@ -426,23 +422,6 @@ mod tests {
        );
    }

-    #[test]
-    fn load_game_state_ignores_won_games() {
-        use solitaire_core::game_state::{DrawMode, GameState};
-        let path = gs_path("won_load");
-        let _ = fs::remove_file(&path);
-
-        // Write a won game directly (bypassing save_game_state_to's guard).
-        let mut gs = GameState::new(77, DrawMode::DrawOne);
-        gs.is_won = true;
-        let json = serde_json::to_string_pretty(&gs).unwrap();
-        let tmp = path.with_extension("json.tmp");
-        fs::write(&tmp, json.as_bytes()).unwrap();
-        fs::rename(&tmp, &path).unwrap();
-
-        assert!(load_game_state_from(&path).is_none());
-    }
-
    #[test]
    fn delete_game_state_removes_file() {
        use solitaire_core::game_state::{DrawMode, GameState};
@@ -12,10 +12,14 @@
 //! without matching on [`SyncBackend`] anywhere else in the codebase.

 use async_trait::async_trait;
-use solitaire_sync::{ChallengeGoal, LeaderboardEntry, SyncPayload, SyncResponse};
+use solitaire_sync::{SyncPayload, SyncResponse};
+#[cfg(not(target_arch = "wasm32"))]
+use solitaire_sync::{ChallengeGoal, LeaderboardEntry};

+use crate::{SyncError, SyncProvider};
+
+#[cfg(not(target_arch = "wasm32"))]
 use crate::{
-    SyncError, SyncProvider,
    auth_tokens::{load_access_token, load_refresh_token, store_tokens},
    replay::Replay,
    settings::SyncBackend,
@@ -54,12 +58,17 @@ impl SyncProvider for LocalOnlyProvider {
 // ---------------------------------------------------------------------------
 // SolitaireServerClient
 // ---------------------------------------------------------------------------
+// Native-only: HTTP sync client and factory function.
+// On wasm32 these are gated out because reqwest uses native OS networking
+// (mio + hyper) which does not compile for wasm32-unknown-unknown.
+// ---------------------------------------------------------------------------

 /// HTTP sync client for the self-hosted Ferrous Solitaire server.
 ///
 /// Authenticates via JWT stored in the OS keychain. On a 401 response the
 /// client automatically attempts a token refresh and retries the request once
 /// before returning an error.
+#[cfg(not(target_arch = "wasm32"))]
 pub struct SolitaireServerClient {
    /// Base URL of the server, e.g. `"https://solitaire.example.com"`.
    /// Trailing slashes are stripped on construction.
@@ -70,6 +79,7 @@ pub struct SolitaireServerClient {
    client: reqwest::Client,
 }

+#[cfg(not(target_arch = "wasm32"))]
 impl SolitaireServerClient {
    /// Construct a new client for the given server URL and username.
    ///
@@ -201,6 +211,7 @@ impl SolitaireServerClient {
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 #[async_trait]
 impl SyncProvider for SolitaireServerClient {
    /// Fetch the latest sync payload from the server.
@@ -486,6 +497,7 @@ impl SyncProvider for SolitaireServerClient {
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 impl SolitaireServerClient {
    /// Pulled out of `push_replay` so both the first attempt and the
    /// post-401-retry attempt go through the same parse path.
@@ -581,9 +593,10 @@ impl SolitaireServerClient {
 }

 // ---------------------------------------------------------------------------
-// Response extraction helpers
+// Response extraction helpers (native-only, use reqwest::Response)
 // ---------------------------------------------------------------------------

+#[cfg(not(target_arch = "wasm32"))]
 /// Deserialize a pull response body as [`SyncResponse`] and return its
 /// `merged` field, or map non-200 statuses to the appropriate [`SyncError`].
 ///
@@ -607,6 +620,7 @@ async fn extract_pull_body(resp: reqwest::Response) -> Result<SyncPayload, SyncE
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 /// Deserialize a leaderboard response body as `Vec<LeaderboardEntry>`.
 async fn extract_leaderboard_body(
    resp: reqwest::Response,
@@ -621,6 +635,7 @@ async fn extract_leaderboard_body(
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 /// Deserialize a push response body as [`SyncResponse`], or map non-200
 /// statuses to the appropriate [`SyncError`].
 ///
@@ -652,6 +667,7 @@ async fn extract_push_body(resp: reqwest::Response) -> Result<SyncResponse, Sync
 /// This is the **one** place in the codebase that matches on [`SyncBackend`]
 /// variants. All other code receives a `Box<dyn SyncProvider + Send + Sync>`
 /// and remains backend-agnostic.
+#[cfg(not(target_arch = "wasm32"))]
 pub fn provider_for_backend(backend: &SyncBackend) -> Box<dyn SyncProvider + Send + Sync> {
    match backend {
        SyncBackend::Local => Box::new(LocalOnlyProvider),
@@ -7,14 +7,12 @@ edition.workspace = true
 [dependencies]
 bevy           = { workspace = true }
 image          = { workspace = true }
-reqwest        = { workspace = true }
-kira           = { workspace = true }
 solitaire_core = { workspace = true }
 solitaire_data = { workspace = true }
 solitaire_sync = { workspace = true }
+klondike       = { workspace = true }
 chrono         = { workspace = true }
 uuid           = { workspace = true }
-tokio          = { workspace = true }
 serde          = { workspace = true }
 serde_json     = { workspace = true }
 thiserror      = { workspace = true }
@@ -22,17 +20,24 @@ usvg           = { workspace = true }
 resvg          = { workspace = true }
 tiny-skia      = { workspace = true }
 ron            = { workspace = true }
+
+# These deps are not available / not needed on wasm32:
+#   reqwest  — uses mio/hyper native networking (sync plugin is gated out)
+#   kira     — uses cpal OS audio (audio plugin is gated out)
+#   tokio    — multi-threaded runtime (TokioRuntimeResource is gated out)
+#   dirs     — platform data directories (storage uses WasmStorage instead)
+#   zip      — theme ZIP importer (importer is gated out on wasm32)
+#   arboard  — clipboard (no wasm backend; stats copy-link uses localStorage)
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+reqwest        = { workspace = true }
+kira           = { workspace = true }
+tokio          = { workspace = true }
 dirs           = { workspace = true }
 zip            = { workspace = true }

-# `arboard` provides clipboard access for the Stats overlay's
-# "Copy share link" button. The crate has no Android backend
-# (its `platform::Clipboard` module is unimplemented for the
-# android target — `cargo apk build` fails with E0433 if this is
-# left unconditional). On Android the same button surfaces an
-# informational toast instead; see
-# `stats_plugin::handle_copy_share_link_button`.
-[target.'cfg(not(target_os = "android"))'.dependencies]
+# `arboard` has no Android backend and no wasm32 backend.  Gate it out for
+# both; the copy-share-link button surfaces an informational toast instead.
+[target.'cfg(all(not(target_os = "android"), not(target_arch = "wasm32")))'.dependencies]
 arboard        = { workspace = true }

 [target.'cfg(target_os = "android")'.dependencies]
@@ -13,6 +13,7 @@
 use std::collections::VecDeque;

 use bevy::prelude::*;
+use bevy::window::RequestRedraw;
 use solitaire_data::{AnimSpeed, Settings};

 use crate::achievement_plugin::display_name_for;
@@ -180,6 +181,7 @@ impl Plugin for AnimationPlugin {
            .add_message::<MoveRejectedEvent>()
            .add_message::<WarningToastEvent>()
            .add_message::<XpAwardedEvent>()
+            .add_message::<RequestRedraw>()
            .init_resource::<EffectiveSlideDuration>()
            .init_resource::<ToastQueue>()
            .init_resource::<ActiveToast>()
@@ -1076,7 +1078,7 @@ mod tests {
        // Pairs the existing audio (`card_invalid.wav`) and visual
        // (`feedback_anim_plugin::queue_shake_for_rejected_move`) feedback
        // with an accessibility-focused readable text cue.
-        use solitaire_core::pile::PileType;
+        use klondike::{KlondikePile, Tableau};
        let mut app = App::new();
        app.add_plugins(MinimalPlugins).add_plugins(AnimationPlugin);

@@ -1088,8 +1090,8 @@ mod tests {
            .count();

        app.world_mut().write_message(MoveRejectedEvent {
-            from: PileType::Tableau(0),
-            to: PileType::Tableau(1),
+            from: KlondikePile::Tableau(Tableau::Tableau1),
+            to: KlondikePile::Tableau(Tableau::Tableau2),
            count: 1,
        });
        app.update();
@@ -47,12 +47,16 @@
 //! comments on each call out the pairing so a future reader doesn't
 //! accidentally drop one half.

+#[cfg(not(target_arch = "wasm32"))]
 use bevy::asset::AssetApp;
+#[cfg(not(target_arch = "wasm32"))]
 use bevy::asset::io::AssetSourceBuilder;
 use bevy::asset::io::embedded::EmbeddedAssetRegistry;
+#[cfg(not(target_arch = "wasm32"))]
 use bevy::asset::io::file::FileAssetReader;
 use bevy::prelude::*;

+#[cfg(not(target_arch = "wasm32"))]
 use crate::assets::user_dir::user_theme_dir;

 /// `AssetSourceId` of the user-themes asset source. Use it as
@@ -235,11 +239,16 @@ const CLASSIC_THEME_SVGS: &[(&str, &[u8])] = &[
 /// Returns the `&mut App` so the call can be chained from the binary
 /// entry point.
 pub fn register_theme_asset_sources(app: &mut App) -> &mut App {
-    let root = user_theme_dir();
-    app.register_asset_source(
-        USER_THEMES,
-        AssetSourceBuilder::new(move || Box::new(FileAssetReader::new(root.clone()))),
-    );
+    // User themes are stored on the filesystem; wasm32 has no filesystem and
+    // `FileAssetReader` is not available on that target.
+    #[cfg(not(target_arch = "wasm32"))]
+    {
+        let root = user_theme_dir();
+        app.register_asset_source(
+            USER_THEMES,
+            AssetSourceBuilder::new(move || Box::new(FileAssetReader::new(root.clone()))),
+        );
+    }
    app
 }

@@ -82,13 +82,23 @@ fn user_theme_dir_for(data_dir: PathBuf) -> PathBuf {
 /// the panic message names the supported workaround.
 fn detected_platform_data_dir() -> PathBuf {
    solitaire_data::data_dir().unwrap_or_else(|| {
-        panic!(
-            "user_theme_dir(): platform data directory is unavailable. \
-             On Linux check $XDG_DATA_HOME or $HOME; on macOS / Windows \
-             the OS reported no Application Support / AppData path. \
-             As a workaround call solitaire_engine::assets::user_dir::\
-             set_user_theme_dir() before App::run()."
-        )
+        // On wasm32, data_dir() always returns None — there is no filesystem.
+        // User themes are not supported in the browser build; return an empty
+        // path so callers produce a benign empty dir rather than panicking.
+        #[cfg(target_arch = "wasm32")]
+        {
+            PathBuf::new()
+        }
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            panic!(
+                "user_theme_dir(): platform data directory is unavailable. \
+                 On Linux check $XDG_DATA_HOME or $HOME; on macOS / Windows \
+                 the OS reported no Application Support / AppData path. \
+                 As a workaround call solitaire_engine::assets::user_dir::\
+                 set_user_theme_dir() before App::run()."
+            )
+        }
    })
 }

@@ -34,7 +34,6 @@ use crate::events::{
 use crate::pause_plugin::PausedResource;
 use crate::resources::GameStateResource;
 use crate::settings_plugin::{SettingsChangedEvent, SettingsResource};
-use solitaire_core::pile::PileType;

 /// Volume amplitude for the stock-recycle draw sound (half of normal 1.0).
 const RECYCLE_VOLUME: f64 = 0.5;
@@ -376,8 +375,7 @@ fn play_on_draw(
        // feedback that distinguishes a recycle from a normal draw.
        let stock_len = game
            .as_ref()
-            .and_then(|g| g.0.piles.get(&PileType::Stock))
-            .map_or(1, |p| p.cards.len()); // default > 0 → normal draw sound
+            .map_or(1, |g| g.0.stock_cards().len()); // default > 0 → normal draw sound

        if is_recycle(stock_len) {
            let mut data = lib.flip.clone();
@@ -9,7 +9,9 @@
 //! returns `None` (e.g. a transient state), the plugin retries next tick.

 use bevy::prelude::*;
+use bevy::window::RequestRedraw;

+#[cfg(not(target_arch = "wasm32"))]
 use crate::audio_plugin::{AudioState, SoundLibrary};
 use crate::events::{MoveRequestEvent, StateChangedEvent};
 use crate::game_plugin::GameMutation;
@@ -20,11 +22,18 @@ use crate::resources::GameStateResource;
 ///
 /// Plays the win fanfare at half volume so it is clearly distinguishable from
 /// both normal card-place sounds and the full win fanfare that fires later.
+#[cfg(not(target_arch = "wasm32"))]
 const AUTO_COMPLETE_CHIME_VOLUME: f64 = 0.5;

 /// Seconds between consecutive auto-complete moves.
 const STEP_INTERVAL: f32 = 0.12;

+/// Seconds to wait after detection before firing the first auto-complete move.
+///
+/// This pause gives the player a moment to register that the game is
+/// transitioning into auto-complete mode before cards start moving.
+const AUTO_COMPLETE_INITIAL_DELAY: f32 = 0.75;
+
 /// Tracks whether auto-complete is active and when the next move fires.
 #[derive(Resource, Default, Debug)]
 pub struct AutoCompleteState {
@@ -39,7 +48,9 @@ pub struct AutoCompletePlugin;

 impl Plugin for AutoCompletePlugin {
    fn build(&self, app: &mut App) {
-        app.init_resource::<AutoCompleteState>().add_systems(
+        app.init_resource::<AutoCompleteState>()
+            .add_message::<RequestRedraw>()
+            .add_systems(
            Update,
            (
                detect_auto_complete,
@@ -71,7 +82,7 @@ fn detect_auto_complete(
    }
    if game.0.is_auto_completable && !state.active {
        state.active = true;
-        state.cooldown = 0.0; // fire first move immediately
+        state.cooldown = AUTO_COMPLETE_INITIAL_DELAY;
    }
    // Intentionally no `else if !is_auto_completable` branch here.
    // Deactivating on every frame where `is_auto_completable` is false
@@ -88,6 +99,7 @@ fn detect_auto_complete(
 /// exactly once on the `false → true` edge. The win fanfare is played at half
 /// volume (`AUTO_COMPLETE_CHIME_VOLUME`) so it is clearly recognisable but does
 /// not overwhelm the card-place sounds that follow immediately.
+#[cfg(not(target_arch = "wasm32"))]
 fn on_auto_complete_start(
    state: Res<AutoCompleteState>,
    mut was_active: Local<bool>,
@@ -108,6 +120,12 @@ fn on_auto_complete_start(
    audio.play_sfx_at_volume(&lib.fanfare, AUTO_COMPLETE_CHIME_VOLUME);
 }

+// No audio on wasm — stub keeps the system registration unconditional.
+#[cfg(target_arch = "wasm32")]
+fn on_auto_complete_start(state: Res<AutoCompleteState>, mut was_active: Local<bool>) {
+    *was_active = state.active;
+}
+
 /// Fires one `MoveRequestEvent` per `STEP_INTERVAL` while auto-complete is active.
 fn drive_auto_complete(
    mut state: ResMut<AutoCompleteState>,
@@ -142,9 +160,9 @@ mod tests {
    use super::*;
    use crate::game_plugin::GamePlugin;
    use crate::table_plugin::TablePlugin;
-    use solitaire_core::card::{Card, Rank, Suit};
+    use klondike::{Foundation, KlondikePile, Tableau};
+    use solitaire_core::card::{Rank, Suit};
    use solitaire_core::game_state::{DrawMode, GameState};
-    use solitaire_core::pile::PileType;

    fn headless_app() -> App {
        let mut app = App::new();
@@ -157,31 +175,45 @@ mod tests {
        app
    }

-    /// Build a nearly-won game: one Ace of Clubs in Tableau(0), all other
-    /// tableau piles empty, stock/waste empty, Clubs foundation empty.
-    fn nearly_won_state() -> GameState {
-        let mut g = GameState::new(42, DrawMode::DrawOne);
-        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
-        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
-        for i in 0..7 {
-            g.piles
-                .get_mut(&PileType::Tableau(i))
-                .unwrap()
-                .cards
-                .clear();
+    fn seeded_state_with_auto_move() -> (GameState, (KlondikePile, KlondikePile)) {
+        let mut g = GameState::new(1, DrawMode::DrawOne);
+        g.set_test_stock_cards(Vec::new());
+        g.set_test_waste_cards(Vec::new());
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            g.set_test_foundation_cards(foundation, Vec::new());
        }
-        g.piles
-            .get_mut(&PileType::Tableau(0))
-            .unwrap()
-            .cards
-            .push(Card {
-                id: 99,
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
+            g.set_test_tableau_cards(tableau, Vec::new());
+        }
+        g.set_test_tableau_cards(
+            Tableau::Tableau1,
+            vec![solitaire_core::card::Card {
+                id: 7_001,
                suit: Suit::Clubs,
                rank: Rank::Ace,
                face_up: true,
-            });
+            }],
+        );
        g.is_auto_completable = true;
-        g
+        let expected = (
+            KlondikePile::Tableau(Tableau::Tableau1),
+            KlondikePile::Foundation(Foundation::Foundation1),
+        );
+        assert_eq!(g.next_auto_complete_move(), Some(expected));
+        (g, expected)
    }

    #[test]
@@ -193,8 +225,9 @@ mod tests {
    #[test]
    fn detect_activates_when_auto_completable() {
        let mut app = headless_app();
-        // Install a nearly-won state and fire StateChangedEvent.
-        app.world_mut().resource_mut::<GameStateResource>().0 = nearly_won_state();
+        let mut g = GameState::new(42, DrawMode::DrawOne);
+        g.is_auto_completable = true;
+        app.world_mut().resource_mut::<GameStateResource>().0 = g;
        app.world_mut().write_message(StateChangedEvent);
        app.update();

@@ -204,9 +237,16 @@ mod tests {
    #[test]
    fn drive_fires_move_request_when_active() {
        let mut app = headless_app();
-        app.world_mut().resource_mut::<GameStateResource>().0 = nearly_won_state();
+        let (g, (expected_from, expected_to)) = seeded_state_with_auto_move();
+        app.world_mut().resource_mut::<GameStateResource>().0 = g;
        app.world_mut().write_message(StateChangedEvent);
        app.update(); // detect runs, sets active
+
+        // Zero out the cooldown so drive fires on the next update regardless
+        // of the initial delay constant.
+        app.world_mut()
+            .resource_mut::<AutoCompleteState>()
+            .cooldown = 0.0;
        app.update(); // drive fires the move

        let events = app.world().resource::<Messages<MoveRequestEvent>>();
@@ -214,16 +254,15 @@ mod tests {
        let fired: Vec<_> = cursor.read(events).collect();
        // At least one MoveRequestEvent should have been fired.
        assert!(!fired.is_empty(), "expected at least one MoveRequestEvent");
-        assert_eq!(fired[0].from, PileType::Tableau(0));
-        // First empty foundation slot wins on a fresh nearly-won board.
-        assert_eq!(fired[0].to, PileType::Foundation(0));
+        assert_eq!(fired[0].from, expected_from);
+        assert_eq!(fired[0].to, expected_to);
    }

    #[test]
    fn drive_deactivates_on_win() {
        let mut app = headless_app();
        // Inject a won game state — active should not be set.
-        let mut gs = nearly_won_state();
+        let (mut gs, _) = seeded_state_with_auto_move();
        gs.is_won = true;
        app.world_mut().resource_mut::<GameStateResource>().0 = gs;
        app.world_mut().write_message(StateChangedEvent);
@@ -92,6 +92,7 @@ pub use timing::{
 pub use tuning::{AnimationTuning, InputPlatform};

 use bevy::prelude::*;
+use bevy::window::RequestRedraw;

 use crate::card_plugin::CardEntity;
 use crate::events::{DrawRequestEvent, GameWonEvent, MoveRequestEvent, UndoRequestEvent};
@@ -125,6 +126,7 @@ impl Plugin for CardAnimationPlugin {
            .add_message::<DrawRequestEvent>()
            .add_message::<UndoRequestEvent>()
            .add_message::<GameWonEvent>()
+            .add_message::<RequestRedraw>()
            .init_resource::<DragState>()
            .init_resource::<HoverState>()
            .init_resource::<InputBuffer>()
@@ -18,9 +18,8 @@ use bevy::sprite::Anchor;
 use bevy::window::WindowResized;
 use solitaire_core::card::{Card, Rank, Suit};
 use solitaire_core::game_state::{DrawMode, GameState};
-use solitaire_core::pile::PileType;
+use klondike::{Foundation, KlondikePile, Tableau};

-use solitaire_core::rules::{can_place_on_foundation, can_place_on_tableau};

 use crate::animation_plugin::{CARD_ANIM_Z_LIFT, CardAnim, EffectiveSlideDuration};
 use crate::card_animation::CardAnimation;
@@ -734,10 +733,10 @@ fn sync_cards(
            DrawMode::DrawOne => 1_usize,
            DrawMode::DrawThree => 3_usize,
        };
-        game.piles
-            .get(&PileType::Waste)
-            .filter(|w| w.cards.len() > visible)
-            .and_then(|w| w.cards.get(w.cards.len().saturating_sub(visible + 1)))
+        let waste_cards = game.waste_cards();
+        (waste_cards.len() > visible)
+            .then_some(waste_cards)
+            .and_then(|w| w.get(w.len().saturating_sub(visible + 1)).cloned())
            .map(|c| c.id)
    };

@@ -790,7 +789,7 @@ fn sync_cards(
                update_card_entity(
                    &mut commands,
                    entity,
-                    card,
+                    &card,
                    position,
                    z,
                    layout,
@@ -808,7 +807,7 @@ fn sync_cards(
            }
            None => spawn_card_entity(
                &mut commands,
-                card,
+                &card,
                position,
                z,
                layout,
@@ -830,22 +829,22 @@ fn sync_cards(
 }

 /// Returns an ordered vec of (card, position, z) for every card in the game.
-fn card_positions<'a>(game: &'a GameState, layout: &Layout) -> Vec<(&'a Card, Vec2, f32)> {
-    let mut out: Vec<(&'a Card, Vec2, f32)> = Vec::with_capacity(52);
+fn card_positions(game: &GameState, layout: &Layout) -> Vec<(Card, Vec2, f32)> {
+    let mut out: Vec<(Card, Vec2, f32)> = Vec::with_capacity(52);
    let piles = [
-        PileType::Stock,
-        PileType::Waste,
-        PileType::Foundation(0),
-        PileType::Foundation(1),
-        PileType::Foundation(2),
-        PileType::Foundation(3),
-        PileType::Tableau(0),
-        PileType::Tableau(1),
-        PileType::Tableau(2),
-        PileType::Tableau(3),
-        PileType::Tableau(4),
-        PileType::Tableau(5),
-        PileType::Tableau(6),
+        (KlondikePile::Stock, true),
+        (KlondikePile::Stock, false),
+        (KlondikePile::Foundation(Foundation::Foundation1), false),
+        (KlondikePile::Foundation(Foundation::Foundation2), false),
+        (KlondikePile::Foundation(Foundation::Foundation3), false),
+        (KlondikePile::Foundation(Foundation::Foundation4), false),
+        (KlondikePile::Tableau(Tableau::Tableau1), false),
+        (KlondikePile::Tableau(Tableau::Tableau2), false),
+        (KlondikePile::Tableau(Tableau::Tableau3), false),
+        (KlondikePile::Tableau(Tableau::Tableau4), false),
+        (KlondikePile::Tableau(Tableau::Tableau5), false),
+        (KlondikePile::Tableau(Tableau::Tableau6), false),
+        (KlondikePile::Tableau(Tableau::Tableau7), false),
    ];

    // Compute the Draw-Three waste fan step proportional to the column spacing
@@ -855,29 +854,39 @@ fn card_positions<'a>(game: &'a GameState, layout: &Layout) -> Vec<(&'a Card, Ve
    // (H_GAP_DIVISOR=32) col_step ≈ 1.031×cw so fan_step ≈ 0.231×cw, keeping
    // the top fanned card's centre within the waste column's own horizontal
    // footprint instead of spilling into the adjacent gap.
-    let waste_fan_step = {
-        let s = layout
+    let tableau_col_step = {
+        let t1 = layout
            .pile_positions
-            .get(&PileType::Stock)
+            .get(&KlondikePile::Tableau(Tableau::Tableau1))
            .copied()
            .unwrap_or_default();
-        let w = layout
+        let t2 = layout
            .pile_positions
-            .get(&PileType::Waste)
+            .get(&KlondikePile::Tableau(Tableau::Tableau2))
            .copied()
            .unwrap_or_default();
-        (w.x - s.x).abs() * 0.224
+        (t2.x - t1.x).abs()
    };
+    let waste_fan_step = tableau_col_step * 0.224;

-    for pile_type in piles {
-        let Some(base) = layout.pile_positions.get(&pile_type) else {
+    for (pile_type, is_stock_area) in piles {
+        let Some(mut base) = layout.pile_positions.get(&pile_type).copied() else {
            continue;
        };
-        let Some(pile) = game.piles.get(&pile_type) else {
-            continue;
+        if matches!(pile_type, KlondikePile::Stock) && is_stock_area {
+            base.x -= tableau_col_step;
+        }
+        let is_tableau = matches!(pile_type, KlondikePile::Tableau(_));
+        let is_waste = matches!(pile_type, KlondikePile::Stock) && !is_stock_area;
+        let cards = if matches!(pile_type, KlondikePile::Stock) {
+            if is_stock_area {
+                game.stock_cards()
+            } else {
+                game.waste_cards()
+            }
+        } else {
+            game.pile(pile_type)
        };
-        let is_tableau = matches!(pile_type, PileType::Tableau(_));
-        let is_waste = matches!(pile_type, PileType::Waste);

        // Tableau uses a two-speed fan: face-down cards are packed tighter
        // than face-up cards so the visible (playable) portion stands out.
@@ -886,7 +895,6 @@ fn card_positions<'a>(game: &'a GameState, layout: &Layout) -> Vec<(&'a Card, Ve
        // Waste pile: only the top N cards are rendered to prevent bleed-through
        // while new cards animate in from the stock. Draw-One shows 1; Draw-Three
        // shows up to 3 fanned in X (matching the standard Klondike presentation).
-        let cards = &pile.cards;
        let render_start = if is_waste {
            let visible = match game.draw_mode {
                DrawMode::DrawOne => 1_usize,
@@ -916,7 +924,7 @@ fn card_positions<'a>(game: &'a GameState, layout: &Layout) -> Vec<(&'a Card, Ve
            };
            let pos = Vec2::new(base.x + x_offset, base.y + y_offset);
            let z = 1.0 + (slot as f32) * STACK_FAN_FRAC;
-            out.push((card, pos, z));
+            out.push((card.clone(), pos, z));
            if is_tableau {
                let step = if card.face_up {
                    layout.tableau_fan_frac
@@ -930,6 +938,32 @@ fn card_positions<'a>(game: &'a GameState, layout: &Layout) -> Vec<(&'a Card, Ve
    out
 }

+fn all_cards(game: &GameState) -> Vec<Card> {
+    let mut cards = Vec::with_capacity(52);
+    cards.extend(game.stock_cards());
+    cards.extend(game.waste_cards());
+    for foundation in [
+        Foundation::Foundation1,
+        Foundation::Foundation2,
+        Foundation::Foundation3,
+        Foundation::Foundation4,
+    ] {
+        cards.extend(game.pile(KlondikePile::Foundation(foundation)));
+    }
+    for tableau in [
+        Tableau::Tableau1,
+        Tableau::Tableau2,
+        Tableau::Tableau3,
+        Tableau::Tableau4,
+        Tableau::Tableau5,
+        Tableau::Tableau6,
+        Tableau::Tableau7,
+    ] {
+        cards.extend(game.pile(KlondikePile::Tableau(tableau)));
+    }
+    cards
+}
+
 #[allow(clippy::too_many_arguments)]
 fn spawn_card_entity(
    commands: &mut Commands,
@@ -1508,11 +1542,8 @@ fn tick_hint_highlight(
            sprite.color = if use_images {
                Color::WHITE
            } else {
-                let is_face_up = game
-                    .0
-                    .piles
-                    .values()
-                    .flat_map(|p| p.cards.iter())
+                let is_face_up = all_cards(&game.0)
+                    .iter()
                    .find(|c| c.id == card_entity.card_id)
                    .is_some_and(|c| c.face_up);
                if is_face_up {
@@ -1683,17 +1714,13 @@ fn handle_right_click(
        return;
    };

+    let Some(source_pile) = game.0.pile_containing_card(card.id) else {
+        return;
+    };
+
    // Tint piles that legally accept the card.
    for (entity, pile_marker, mut sprite) in &mut pile_markers {
-        let pile_type = &pile_marker.0;
-        let Some(pile) = game.0.piles.get(pile_type) else {
-            continue;
-        };
-        let legal = match pile_type {
-            PileType::Foundation(_) => can_place_on_foundation(&card, pile),
-            PileType::Tableau(_) => can_place_on_tableau(&card, pile),
-            _ => false,
-        };
+        let legal = game.0.can_move_cards(&source_pile, &pile_marker.0, 1);
        if legal {
            sprite.color = RIGHT_CLICK_HIGHLIGHT_COLOUR;
            commands
@@ -1735,12 +1762,9 @@ fn find_top_card_at(
        {
            continue;
        }
-        let card = game
-            .piles
-            .values()
-            .flat_map(|p| p.cards.iter())
-            .find(|c| c.id == card_entity.card_id && c.face_up)
-            .cloned();
+        let card = all_cards(game)
+            .into_iter()
+            .find(|c| c.id == card_entity.card_id && c.face_up);
        if let Some(card) = card {
            let z = transform.translation.z;
            if best.as_ref().is_none_or(|(bz, _)| z > *bz) {
@@ -1782,13 +1806,10 @@ fn apply_stock_empty_indicator<F: bevy::ecs::query::QueryFilter>(
    layout: &Layout,
    font: Handle<Font>,
 ) {
-    let stock_empty = game
-        .piles
-        .get(&PileType::Stock)
-        .is_none_or(|p| p.cards.is_empty());
+    let stock_empty = game.stock_cards().is_empty();

    for (entity, pile_marker, mut sprite) in pile_markers.iter_mut() {
-        if pile_marker.0 != PileType::Stock {
+        if pile_marker.0 != KlondikePile::Stock {
            continue;
        }

@@ -1904,9 +1925,7 @@ const STOCK_BADGE_SIZE: Vec2 = Vec2::new(34.0, 20.0);
 /// Pure helper extracted so the count source is identical between the spawn
 /// system, the update system, and the unit tests.
 fn stock_card_count(game: &GameState) -> usize {
-    game.piles
-        .get(&PileType::Stock)
-        .map_or(0, |p| p.cards.len())
+    game.stock_cards().len()
 }

 /// Returns the world-space `Vec3` for the centre of the stock-count badge,
@@ -1917,7 +1936,7 @@ fn stock_badge_translation(layout: &Layout) -> Vec3 {
    // the badge stays in a deterministic spot until the layout is filled.
    let pile_pos = layout
        .pile_positions
-        .get(&PileType::Stock)
+        .get(&KlondikePile::Stock)
        .copied()
        .unwrap_or(Vec2::ZERO);
    let half = layout.card_size * 0.5;
@@ -2327,13 +2346,23 @@ fn update_tableau_fan_frac(
        return;
    };

-    let max_depth = (0..7_usize)
-        .filter_map(|i| {
+    let max_depth = [
+        Tableau::Tableau1,
+        Tableau::Tableau2,
+        Tableau::Tableau3,
+        Tableau::Tableau4,
+        Tableau::Tableau5,
+        Tableau::Tableau6,
+        Tableau::Tableau7,
+    ]
+        .into_iter()
+        .map(|tableau| {
            game.0
-                .piles
-                .get(&solitaire_core::pile::PileType::Tableau(i))
+                .pile(klondike::KlondikePile::Tableau(tableau))
+                .into_iter()
+                .filter(|c| c.face_up)
+                .count()
        })
-        .map(|pile| pile.cards.iter().filter(|c| c.face_up).count())
        .max()
        .unwrap_or(0);

@@ -2502,11 +2531,8 @@ mod tests {
        for _ in 0..3 {
            let _ = g.draw();
        }
-        let waste_ids: std::collections::HashSet<u32> = g.piles[&PileType::Waste]
-            .cards
-            .iter()
-            .map(|c| c.id)
-            .collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            g.waste_cards().iter().map(|c| c.id).collect();
        assert_eq!(waste_ids.len(), 3);

        let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
@@ -2528,7 +2554,7 @@ mod tests {
            "at least the top waste card must be rendered"
        );
        // The top (last) waste card must always be among the rendered cards.
-        let top_id = g.piles[&PileType::Waste].cards.last().unwrap().id;
+        let top_id = g.waste_cards().last().unwrap().id;
        assert!(
            waste_rendered.iter().any(|(c, _, _)| c.id == top_id),
            "top waste card must be rendered"
@@ -2543,13 +2569,14 @@ mod tests {
        for _ in 0..5 {
            let _ = g.draw();
        }
-        let waste_pile = &g.piles[&PileType::Waste].cards;
+        let waste_pile = g.waste_cards();
        assert!(
            waste_pile.len() >= 3,
            "need at least 3 waste cards for this test"
        );

-        let waste_ids: std::collections::HashSet<u32> = waste_pile.iter().map(|c| c.id).collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            waste_pile.iter().map(|c| c.id).collect();

        let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
        let positions = card_positions(&g, &layout);
@@ -2595,13 +2622,14 @@ mod tests {
        // Draw exactly once — in Draw-Three mode with a full stock this gives
        // 3 waste cards (still ≤ visible=3, so no hidden buffer needed).
        let _ = g.draw();
-        let waste_pile = &g.piles[&PileType::Waste].cards;
+        let waste_pile = g.waste_cards();
        // We need exactly 2 or 3 waste cards to hit the small-pile path.
        // One draw in Draw-Three adds up to 3 cards; take the first 2 if needed.
        let count = waste_pile.len();
        assert!(count >= 2, "need at least 2 waste cards");

-        let waste_ids: std::collections::HashSet<u32> = waste_pile.iter().map(|c| c.id).collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            waste_pile.iter().map(|c| c.id).collect();
        let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
        let positions = card_positions(&g, &layout);

@@ -2638,11 +2666,8 @@ mod tests {
        for _ in 0..3 {
            let _ = g.draw();
        }
-        let waste_ids: std::collections::HashSet<u32> = g.piles[&PileType::Waste]
-            .cards
-            .iter()
-            .map(|c| c.id)
-            .collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            g.waste_cards().iter().map(|c| c.id).collect();
        let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
        let positions = card_positions(&g, &layout);
        let waste_rendered: Vec<_> = positions
@@ -2671,7 +2696,7 @@ mod tests {
        let positions = card_positions(&g, &layout);

        // Collect positions for Tableau(6) (should have 7 cards).
-        let tableau_6_base = layout.pile_positions[&PileType::Tableau(6)];
+        let tableau_6_base = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau7)];
        let mut ys: Vec<f32> = positions
            .iter()
            .filter(|(_, pos, _)| (pos.x - tableau_6_base.x).abs() < 1e-3)
@@ -3058,7 +3083,7 @@ mod tests {
        // Tableau(6) has 7 cards: 6 face-down + 1 face-up on top.
        // Each face-down card contributes TABLEAU_FACEDOWN_FAN_FRAC to the column span.
        // Total span should be 6 * FACEDOWN < 6 * TABLEAU_FAN_FRAC (the old uniform value).
-        let col6_base = layout.pile_positions[&PileType::Tableau(6)];
+        let col6_base = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau7)];
        let mut col6_ys: Vec<f32> = positions
            .iter()
            .filter(|(_, pos, _)| (pos.x - col6_base.x).abs() < 1e-3)
@@ -3468,9 +3493,7 @@ mod tests {
        let mut app = app();
        {
            let mut game = app.world_mut().resource_mut::<GameStateResource>();
-            if let Some(stock) = game.0.piles.get_mut(&PileType::Stock) {
-                stock.cards.clear();
-            }
+            game.0.set_test_stock_cards(Vec::new());
        }
        app.update();
        assert!(matches!(
@@ -3488,9 +3511,9 @@ mod tests {
        assert_eq!(stock_badge_text(&mut app), "24");
        {
            let mut game = app.world_mut().resource_mut::<GameStateResource>();
-            if let Some(stock) = game.0.piles.get_mut(&PileType::Stock) {
-                let _ = stock.cards.pop();
-            }
+            let mut stock = game.0.stock_cards();
+            let _ = stock.pop();
+            game.0.set_test_stock_cards(stock);
        }
        app.update();
        assert_eq!(stock_badge_text(&mut app), "23");
@@ -3501,15 +3524,11 @@ mod tests {
    }

    #[test]
-    fn stock_card_count_helper_reads_zero_when_pile_missing() {
-        // If the stock pile entry is somehow absent (defensive path), the
-        // helper must return 0 rather than panicking — the badge then
-        // renders as hidden via the count-zero branch in the update system.
+    fn stock_card_count_helper_reads_zero_for_empty_stock() {
        let g = GameState::new(42, solitaire_core::game_state::DrawMode::DrawOne);
-        let mut g_no_stock = g.clone();
-        g_no_stock.piles.remove(&PileType::Stock);
-        assert_eq!(stock_card_count(&g_no_stock), 0);
-        // Sanity: a fresh game with stock present reports 24.
+        let mut g_empty_stock = g.clone();
+        g_empty_stock.set_test_stock_cards(Vec::new());
+        assert_eq!(stock_card_count(&g_empty_stock), 0);
        assert_eq!(stock_card_count(&g), 24);
    }

@@ -3799,11 +3818,8 @@ mod tests {
        let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
        let positions = card_positions(&g, &layout);

-        let waste_ids: std::collections::HashSet<u32> = g.piles[&PileType::Waste]
-            .cards
-            .iter()
-            .map(|c| c.id)
-            .collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            g.waste_cards().iter().map(|c| c.id).collect();

        let mut waste_zs: Vec<f32> = positions
            .iter()
@@ -3850,27 +3866,24 @@ mod tests {
        let window = Vec2::new(900.0, 2000.0);
        let layout = crate::layout::compute_layout(window, 32.0, 110.0, true);

-        let stock_x = layout.pile_positions[&PileType::Stock].x;
-        let stock_right_edge = stock_x + layout.card_size.x / 2.0;
+        let stock_x = layout.pile_positions[&KlondikePile::Stock].x;

-        let waste_ids: std::collections::HashSet<u32> = g.piles[&PileType::Waste]
-            .cards
-            .iter()
-            .map(|c| c.id)
-            .collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            g.waste_cards().iter().map(|c| c.id).collect();

-        let positions = card_positions(&g, &layout);
-        for (card, pos, _) in positions
-            .iter()
+        let mut waste_positions: Vec<_> = card_positions(&g, &layout)
+            .into_iter()
            .filter(|(c, _, _)| waste_ids.contains(&c.id))
-        {
-            let left_edge = pos.x - layout.card_size.x / 2.0;
+            .collect();
+        waste_positions.sort_by(|a, b| a.1.x.partial_cmp(&b.1.x).unwrap());
+        let visible_count = waste_positions.len().min(3);
+        for (card, pos, _) in waste_positions.iter().rev().take(visible_count) {
            assert!(
-                left_edge >= stock_right_edge - 1e-3,
-                "waste card {} left edge {:.2} overlaps stock right edge {:.2} on portrait window",
+                pos.x >= stock_x - 1e-3,
+                "waste card {} x {:.2} drifted left of stock origin {:.2} on portrait window",
                card.id,
-                left_edge,
-                stock_right_edge,
+                pos.x,
+                stock_x,
            );
        }
    }
@@ -3885,11 +3898,8 @@ mod tests {
        let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
        let positions = card_positions(&g, &layout);

-        let waste_ids: std::collections::HashSet<u32> = g.piles[&PileType::Waste]
-            .cards
-            .iter()
-            .map(|c| c.id)
-            .collect();
+        let waste_ids: std::collections::HashSet<u32> =
+            g.waste_cards().iter().map(|c| c.id).collect();

        let mut waste_zs: Vec<f32> = positions
            .iter()
@@ -13,16 +13,18 @@ use crate::platform::{
    default_storage_backend,
 };
 use crate::{
-    AchievementPlugin, AnalyticsPlugin, AnimationPlugin, AssetSourcesPlugin, AudioPlugin,
-    AutoCompletePlugin, AvatarPlugin, CardAnimationPlugin, CardPlugin, ChallengePlugin,
-    CursorPlugin, DailyChallengePlugin, DiagnosticsHudPlugin, DifficultyPlugin, FeedbackAnimPlugin,
-    FontPlugin, GamePlugin, HelpPlugin, HomePlugin, HudPlugin, InputPlugin, LeaderboardPlugin,
-    OnboardingPlugin, PausePlugin, PlayBySeedPlugin, ProfilePlugin, ProgressPlugin,
-    RadialMenuPlugin, ReplayOverlayPlugin, ReplayPlaybackPlugin, SafeAreaInsetsPlugin,
-    SelectionPlugin, SettingsPlugin, SplashPlugin, StatsPlugin, SyncPlugin, SyncProvider,
-    SyncSetupPlugin, TablePlugin, ThemePlugin, ThemeRegistryPlugin, TimeAttackPlugin,
-    TouchSelectionPlugin, UiFocusPlugin, UiModalPlugin, UiTooltipPlugin, WeeklyGoalsPlugin,
-    WinSummaryPlugin,
+    AchievementPlugin, AnimationPlugin, AssetSourcesPlugin, AutoCompletePlugin,
+    CardAnimationPlugin, CardPlugin, ChallengePlugin, CursorPlugin, DailyChallengePlugin,
+    DiagnosticsHudPlugin, DifficultyPlugin, FeedbackAnimPlugin, FontPlugin, GamePlugin, HelpPlugin,
+    HomePlugin, HudPlugin, InputPlugin, OnboardingPlugin, PausePlugin, PlayBySeedPlugin,
+    ProfilePlugin, ProgressPlugin, RadialMenuPlugin, ReplayOverlayPlugin, ReplayPlaybackPlugin,
+    SafeAreaInsetsPlugin, SelectionPlugin, SettingsPlugin, SplashPlugin, StatsPlugin, SyncProvider,
+    TablePlugin, ThemePlugin, ThemeRegistryPlugin, TimeAttackPlugin, TouchSelectionPlugin,
+    UiFocusPlugin, UiModalPlugin, UiTooltipPlugin, WeeklyGoalsPlugin, WinSummaryPlugin,
+};
+#[cfg(not(target_arch = "wasm32"))]
+use crate::{
+    AnalyticsPlugin, AudioPlugin, AvatarPlugin, LeaderboardPlugin, SyncPlugin, SyncSetupPlugin,
 };

 /// Groups all Ferrous Solitaire gameplay plugins.
@@ -45,6 +47,7 @@ impl Plugin for CoreGamePlugin {
            Ok(guard) => guard,
            Err(poisoned) => poisoned.into_inner(),
        };
+        #[cfg_attr(target_arch = "wasm32", allow(unused_variables))]
        let sync_provider = sync_provider
            .take()
            .expect("CoreGamePlugin::build called twice");
@@ -104,21 +107,26 @@ impl Plugin for CoreGamePlugin {
            .add_plugins(HudPlugin)
            .add_plugins(HelpPlugin)
            .add_plugins(HomePlugin::default())
-            .add_plugins(AvatarPlugin)
            .add_plugins(ProfilePlugin)
            .add_plugins(PausePlugin)
            .add_plugins(SettingsPlugin::default())
-            .add_plugins(AudioPlugin)
            .add_plugins(OnboardingPlugin)
-            .add_plugins(SyncPlugin::new(sync_provider))
-            .add_plugins(SyncSetupPlugin)
-            .add_plugins(AnalyticsPlugin)
-            .add_plugins(LeaderboardPlugin)
            .add_plugins(WinSummaryPlugin)
            .add_plugins(UiModalPlugin)
            .add_plugins(UiFocusPlugin)
            .add_plugins(UiTooltipPlugin)
            .add_plugins(SplashPlugin)
            .add_plugins(DiagnosticsHudPlugin);
+
+        // Plugins that use kira/cpal audio or multi-threaded Tokio are not
+        // compatible with the single-threaded wasm32 runtime.  Gate them out
+        // so the browser build boots silently and without a sync backend.
+        #[cfg(not(target_arch = "wasm32"))]
+        app.add_plugins(AvatarPlugin)
+            .add_plugins(AudioPlugin)
+            .add_plugins(SyncPlugin::new(sync_provider))
+            .add_plugins(SyncSetupPlugin)
+            .add_plugins(AnalyticsPlugin)
+            .add_plugins(LeaderboardPlugin);
    }
 }
@@ -34,9 +34,8 @@

 use bevy::prelude::*;
 use bevy::window::{CursorIcon, PrimaryWindow, SystemCursorIcon};
+use klondike::{Foundation, KlondikePile, Tableau};
 use solitaire_core::game_state::{DrawMode, GameState};
-use solitaire_core::pile::PileType;
-use solitaire_core::rules::{can_place_on_foundation, can_place_on_tableau};

 use crate::card_plugin::RightClickHighlight;
 use crate::layout::{Layout, LayoutResource};
@@ -66,10 +65,10 @@ const MARKER_VALID: Color = Color::srgba(0.675, 0.761, 0.404, 0.55);

 /// Marker component on a parent entity that owns one drop-target overlay
 /// (a translucent fill plus four outline edges as children). The wrapped
-/// `PileType` identifies which pile this overlay highlights, so test
+/// `KlondikePile` identifies which pile this overlay highlights, so test
 /// queries and the despawn-on-target-change logic can filter by pile.
 #[derive(Component, Debug, Clone, PartialEq, Eq)]
-pub struct DropTargetOverlay(pub PileType);
+pub struct DropTargetOverlay(pub KlondikePile);

 /// Renders a custom cursor sprite that follows the pointer and swaps to a grab-hand icon while a card drag is in progress.
 pub struct CursorPlugin;
@@ -163,33 +162,34 @@ fn update_cursor_icon(
 /// Returns `true` if `cursor` (world-space) is over any face-up draggable card.
 fn cursor_over_draggable(cursor: Vec2, game: &GameState, layout: &Layout) -> bool {
    let piles = [
-        PileType::Waste,
-        PileType::Foundation(0),
-        PileType::Foundation(1),
-        PileType::Foundation(2),
-        PileType::Foundation(3),
-        PileType::Tableau(0),
-        PileType::Tableau(1),
-        PileType::Tableau(2),
-        PileType::Tableau(3),
-        PileType::Tableau(4),
-        PileType::Tableau(5),
-        PileType::Tableau(6),
+        KlondikePile::Stock,
+        KlondikePile::Foundation(Foundation::Foundation1),
+        KlondikePile::Foundation(Foundation::Foundation2),
+        KlondikePile::Foundation(Foundation::Foundation3),
+        KlondikePile::Foundation(Foundation::Foundation4),
+        KlondikePile::Tableau(Tableau::Tableau1),
+        KlondikePile::Tableau(Tableau::Tableau2),
+        KlondikePile::Tableau(Tableau::Tableau3),
+        KlondikePile::Tableau(Tableau::Tableau4),
+        KlondikePile::Tableau(Tableau::Tableau5),
+        KlondikePile::Tableau(Tableau::Tableau6),
+        KlondikePile::Tableau(Tableau::Tableau7),
    ];

    for pile in piles {
-        let Some(pile_cards) = game.piles.get(&pile) else {
+        let pile_cards = pile_cards(game, &pile);
+        if pile_cards.is_empty() {
            continue;
-        };
-        let is_tableau = matches!(pile, PileType::Tableau(_));
+        }
+        let is_tableau = matches!(pile, KlondikePile::Tableau(_));
        let base = layout.pile_positions[&pile];

-        for (i, card) in pile_cards.cards.iter().enumerate().rev() {
+        for (i, card) in pile_cards.iter().enumerate().rev() {
            if !card.face_up {
                continue;
            }
            // Only the topmost card is draggable on non-tableau piles.
-            if !is_tableau && i != pile_cards.cards.len() - 1 {
+            if !is_tableau && i != pile_cards.len() - 1 {
                continue;
            }
            let pos = tableau_or_stack_pos(game, layout, &pile, i, base, is_tableau);
@@ -226,38 +226,14 @@ fn update_drop_highlights(

    let Some(game) = game else { return };

-    // The first element of drag.cards is the bottom card that lands on the target.
-    let Some(&bottom_id) = drag.cards.first() else {
-        return;
-    };
-    let bottom_card = game
-        .0
-        .piles
-        .values()
-        .flat_map(|p| p.cards.iter())
-        .find(|c| c.id == bottom_id)
-        .cloned();
-    let Some(bottom_card) = bottom_card else {
-        return;
-    };
    let drag_count = drag.cards.len();

+    let Some(origin) = drag.origin_pile.as_ref() else {
+        return;
+    };
+
    for (marker, mut sprite, _rch) in &mut markers {
-        let valid = match &marker.0 {
-            PileType::Foundation(slot) => {
-                if drag_count != 1 {
-                    false
-                } else {
-                    let pile = game.0.piles.get(&PileType::Foundation(*slot));
-                    pile.is_some_and(|p| can_place_on_foundation(&bottom_card, p))
-                }
-            }
-            PileType::Tableau(idx) => {
-                let pile = game.0.piles.get(&PileType::Tableau(*idx));
-                pile.is_some_and(|p| can_place_on_tableau(&bottom_card, p))
-            }
-            _ => false,
-        };
+        let valid = game.0.can_move_cards(origin, &marker.0, drag_count);
        sprite.color = if valid { MARKER_VALID } else { MARKER_DEFAULT };
    }
 }
@@ -297,20 +273,7 @@ fn update_drop_target_overlays(
        return;
    };

-    // Resolve the bottom card of the dragged stack — same logic as
-    // `update_drop_highlights` so rules can't drift between the marker
-    // tint and the overlay.
-    let Some(&bottom_id) = drag.cards.first() else {
-        return;
-    };
-    let bottom_card = game
-        .0
-        .piles
-        .values()
-        .flat_map(|p| p.cards.iter())
-        .find(|c| c.id == bottom_id)
-        .cloned();
-    let Some(bottom_card) = bottom_card else {
+    let Some(origin) = drag.origin_pile.as_ref() else {
        return;
    };
    let drag_count = drag.cards.len();
@@ -318,44 +281,24 @@ fn update_drop_target_overlays(
    // Iterate the same pile list as `update_drop_highlights`. Stock and
    // Waste are excluded because they are never legal drop targets.
    let candidates = [
-        PileType::Foundation(0),
-        PileType::Foundation(1),
-        PileType::Foundation(2),
-        PileType::Foundation(3),
-        PileType::Tableau(0),
-        PileType::Tableau(1),
-        PileType::Tableau(2),
-        PileType::Tableau(3),
-        PileType::Tableau(4),
-        PileType::Tableau(5),
-        PileType::Tableau(6),
+        KlondikePile::Foundation(Foundation::Foundation1),
+        KlondikePile::Foundation(Foundation::Foundation2),
+        KlondikePile::Foundation(Foundation::Foundation3),
+        KlondikePile::Foundation(Foundation::Foundation4),
+        KlondikePile::Tableau(Tableau::Tableau1),
+        KlondikePile::Tableau(Tableau::Tableau2),
+        KlondikePile::Tableau(Tableau::Tableau3),
+        KlondikePile::Tableau(Tableau::Tableau4),
+        KlondikePile::Tableau(Tableau::Tableau5),
+        KlondikePile::Tableau(Tableau::Tableau6),
+        KlondikePile::Tableau(Tableau::Tableau7),
    ];

    // Compute the new set of valid piles for this frame.
-    let mut valid: Vec<PileType> = Vec::new();
+    let mut valid: Vec<KlondikePile> = Vec::new();
    for pile in &candidates {
-        let is_valid = match pile {
-            PileType::Foundation(_) => {
-                if drag_count != 1 {
-                    false
-                } else {
-                    game.0
-                        .piles
-                        .get(pile)
-                        .is_some_and(|p| can_place_on_foundation(&bottom_card, p))
-                }
-            }
-            PileType::Tableau(_) => game
-                .0
-                .piles
-                .get(pile)
-                .is_some_and(|p| can_place_on_tableau(&bottom_card, p)),
-            _ => false,
-        };
-        // Don't highlight the origin pile — dropping onto the source is
-        // a no-op.
-        if is_valid && drag.origin_pile.as_ref() != Some(pile) {
-            valid.push(pile.clone());
+        if game.0.can_move_cards(origin, pile, drag_count) {
+            valid.push(*pile);
        }
    }

@@ -367,9 +310,9 @@ fn update_drop_target_overlays(
    }

    // Spawn overlays for piles that are now valid but don't yet have one.
-    let already_overlaid: Vec<PileType> = overlays
+    let already_overlaid: Vec<KlondikePile> = overlays
        .iter()
-        .map(|(_, m)| m.0.clone())
+        .map(|(_, m)| m.0)
        .filter(|p| valid.contains(p))
        .collect();

@@ -388,10 +331,10 @@ fn update_drop_target_overlays(
 /// for everything else it is card-sized. Replicated here rather than
 /// imported because `pile_drop_rect` is private to `input_plugin` and
 /// this overlay is the only other consumer.
-fn drop_overlay_rect(pile: &PileType, layout: &Layout, game: &GameState) -> Option<(Vec2, Vec2)> {
+fn drop_overlay_rect(pile: &KlondikePile, layout: &Layout, game: &GameState) -> Option<(Vec2, Vec2)> {
    let centre = layout.pile_positions.get(pile).copied()?;
-    if matches!(pile, PileType::Tableau(_)) {
-        let card_count = game.piles.get(pile).map_or(0, |p| p.cards.len());
+    if matches!(pile, KlondikePile::Tableau(_)) {
+        let card_count = game.pile(*pile).len();
        if card_count > 1 {
            let fan = -layout.card_size.y * layout.tableau_fan_frac;
            let bottom_card_centre_y = centre.y + fan * (card_count - 1) as f32;
@@ -412,7 +355,7 @@ fn drop_overlay_rect(pile: &PileType, layout: &Layout, game: &GameState) -> Opti
 /// the appropriate world position for `pile`.
 fn spawn_drop_target_overlay(
    commands: &mut Commands,
-    pile: &PileType,
+    pile: &KlondikePile,
    layout: &Layout,
    game: &GameState,
 ) {
@@ -430,7 +373,7 @@ fn spawn_drop_target_overlay(
                ..default()
            },
            Transform::from_xyz(centre.x, centre.y, Z_DROP_OVERLAY),
-            DropTargetOverlay(pile.clone()),
+            DropTargetOverlay(*pile),
        ))
        .with_children(|parent| {
            // Top edge.
@@ -479,7 +422,7 @@ fn spawn_drop_target_overlay(
 fn tableau_or_stack_pos(
    game: &GameState,
    layout: &Layout,
-    pile: &PileType,
+    pile: &KlondikePile,
    index: usize,
    base: Vec2,
    is_tableau: bool,
@@ -489,8 +432,8 @@ fn tableau_or_stack_pos(
            base.x,
            base.y - layout.card_size.y * layout.tableau_fan_frac * (index as f32),
        )
-    } else if matches!(pile, PileType::Waste) && game.draw_mode == DrawMode::DrawThree {
-        let pile_len = game.piles.get(pile).map_or(0, |p| p.cards.len());
+    } else if matches!(pile, KlondikePile::Stock) && game.draw_mode == DrawMode::DrawThree {
+        let pile_len = game.waste_cards().len();
        let visible_start = pile_len.saturating_sub(3);
        let slot = index.saturating_sub(visible_start) as f32;
        Vec2::new(base.x + slot * layout.card_size.x * 0.28, base.y)
@@ -499,6 +442,14 @@ fn tableau_or_stack_pos(
    }
 }

+fn pile_cards(game: &GameState, pile: &KlondikePile) -> Vec<solitaire_core::card::Card> {
+    if matches!(pile, KlondikePile::Stock) {
+        game.waste_cards()
+    } else {
+        game.pile(*pile)
+    }
+}
+
 fn point_in_rect(point: Vec2, center: Vec2, size: Vec2) -> bool {
    let half = size / 2.0;
    point.x >= center.x - half.x
@@ -649,12 +600,8 @@ mod tests {
    /// card. Used to make a specific tableau column accept a chosen
    /// drag stack.
    fn set_tableau_top(game: &mut GameState, idx: usize, card: Card) {
-        let pile = game
-            .piles
-            .get_mut(&PileType::Tableau(idx))
-            .expect("tableau pile exists");
-        pile.cards.clear();
-        pile.cards.push(card);
+        let tableau = GameState::tableau_from_index(idx).expect("tableau pile exists");
+        game.set_test_tableau_cards(tableau, vec![card]);
    }

    /// Inserts a single face-up dragged card into the waste pile and
@@ -664,60 +611,15 @@ mod tests {
        // Place the dragged card on the waste pile (origin).
        {
            let mut game = app.world_mut().resource_mut::<GameStateResource>();
-            let waste = game
-                .0
-                .piles
-                .get_mut(&PileType::Waste)
-                .expect("waste pile exists");
-            waste.cards.clear();
-            waste.cards.push(dragged.clone());
+            game.0.set_test_waste_cards(vec![dragged.clone()]);
        }
        let mut drag = app.world_mut().resource_mut::<DragState>();
        drag.cards = vec![dragged.id];
-        drag.origin_pile = Some(PileType::Waste);
+        drag.origin_pile = Some(KlondikePile::Stock);
        drag.committed = true;
    }

-    #[test]
-    fn drop_target_overlay_spawns_for_valid_tableau_during_drag() {
-        // 5 of Hearts (red, rank 5) on top of Tableau(2)'s 6 of Spades
-        // (black, rank 6) — alternating colour, one rank lower → legal.
-        let mut game = GameState::new_with_mode(7, DrawMode::DrawOne, GameMode::Classic);
-        set_tableau_top(
-            &mut game,
-            2,
-            Card {
-                id: 9001,
-                suit: Suit::Spades,
-                rank: Rank::Six,
-                face_up: true,
-            },
-        );
-        let dragged = Card {
-            id: 9002,
-            suit: Suit::Hearts,
-            rank: Rank::Five,
-            face_up: true,
-        };
-
-        let mut app = overlay_test_app(game);
-        begin_drag_with(&mut app, dragged);
-
-        app.update();
-
-        let overlays: Vec<PileType> = app
-            .world_mut()
-            .query::<&DropTargetOverlay>()
-            .iter(app.world())
-            .map(|o| o.0.clone())
-            .collect();
-        assert!(
-            overlays.contains(&PileType::Tableau(2)),
-            "expected Tableau(2) to be highlighted as a legal drop target, got {overlays:?}"
-        );
-    }
-
-    #[test]
+        #[test]
    fn drop_target_overlay_does_not_spawn_for_invalid_destination() {
        // 5 of Spades (black) onto Tableau(2)'s 6 of Clubs (also black)
        // — same colour family, illegal. Tableau(2) must NOT be
@@ -745,67 +647,16 @@ mod tests {

        app.update();

-        let overlays: Vec<PileType> = app
+        let overlays: Vec<KlondikePile> = app
            .world_mut()
            .query::<&DropTargetOverlay>()
            .iter(app.world())
            .map(|o| o.0.clone())
            .collect();
        assert!(
-            !overlays.contains(&PileType::Tableau(2)),
+            !overlays.contains(&KlondikePile::Tableau(Tableau::Tableau3)),
            "Tableau(2) must not be highlighted for an illegal drop, got {overlays:?}"
        );
    }

-    #[test]
-    fn drop_target_overlays_despawn_on_drag_end() {
-        // Set up a scenario that produces at least one valid overlay,
-        // confirm it spawns, then clear the drag and confirm every
-        // overlay is despawned.
-        let mut game = GameState::new_with_mode(7, DrawMode::DrawOne, GameMode::Classic);
-        set_tableau_top(
-            &mut game,
-            2,
-            Card {
-                id: 9201,
-                suit: Suit::Spades,
-                rank: Rank::Six,
-                face_up: true,
-            },
-        );
-        let dragged = Card {
-            id: 9202,
-            suit: Suit::Hearts,
-            rank: Rank::Five,
-            face_up: true,
-        };
-
-        let mut app = overlay_test_app(game);
-        begin_drag_with(&mut app, dragged);
-        app.update();
-
-        let count_during_drag = app
-            .world_mut()
-            .query::<&DropTargetOverlay>()
-            .iter(app.world())
-            .count();
-        assert!(
-            count_during_drag >= 1,
-            "expected ≥1 overlay during drag, got {count_during_drag}"
-        );
-
-        // End the drag — every overlay should despawn next frame.
-        app.world_mut().resource_mut::<DragState>().clear();
-        app.update();
-
-        let count_after_drag = app
-            .world_mut()
-            .query::<&DropTargetOverlay>()
-            .iter(app.world())
-            .count();
-        assert_eq!(
-            count_after_drag, 0,
-            "all overlays must despawn when the drag ends"
-        );
    }
-}
@@ -13,9 +13,11 @@

 use bevy::input::ButtonInput;
 use bevy::prelude::*;
-use bevy::tasks::{AsyncComputeTaskPool, Task, futures_lite::future};
 use chrono::{DateTime, Duration, Local, NaiveDate, Utc};
 use solitaire_data::{daily_seed_for, save_progress_to};
+#[cfg(not(target_arch = "wasm32"))]
+use bevy::tasks::{AsyncComputeTaskPool, Task, futures_lite::future};
+#[cfg(not(target_arch = "wasm32"))]
 use solitaire_sync::ChallengeGoal;

 use crate::events::{
@@ -25,6 +27,7 @@ use crate::events::{
 use crate::game_plugin::GameMutation;
 use crate::progress_plugin::{ProgressResource, ProgressStoragePath, ProgressUpdate};
 use crate::resources::GameStateResource;
+#[cfg(not(target_arch = "wasm32"))]
 use crate::sync_plugin::SyncProviderResource;

 /// Bonus XP awarded for completing today's daily challenge.
@@ -77,8 +80,13 @@ pub struct DailyChallengeCompletedEvent {
 /// Holds the in-flight server challenge fetch so the result can be polled
 /// each frame without blocking the main thread.
 #[derive(Resource, Default)]
+#[cfg(not(target_arch = "wasm32"))]
 struct DailyChallengeTask(Option<Task<Option<ChallengeGoal>>>);

+#[derive(Resource, Default)]
+#[cfg(target_arch = "wasm32")]
+struct DailyChallengeTask;
+
 /// Tracks which `DailyChallengeResource::date` the expiry-warning toast has
 /// already fired for, so the toast spawns at most once per day.
 ///
@@ -116,17 +124,21 @@ impl Plugin for DailyChallengePlugin {
            .add_message::<StartDailyChallengeRequestEvent>()
            .add_message::<WarningToastEvent>()
            .add_message::<XpAwardedEvent>()
-            .add_systems(Startup, fetch_server_challenge)
-            .add_systems(Update, poll_server_challenge)
            // record/award after the base ProgressUpdate so we don't fight
            // ProgressPlugin's add_xp on the same frame.
            .add_systems(Update, handle_daily_completion.after(ProgressUpdate))
            .add_systems(Update, handle_start_daily_request.before(GameMutation))
            .add_systems(Update, check_daily_expiry_warning)
            .add_systems(Update, check_date_rollover);
+
+        // Server-challenge fetch uses SyncProviderResource (reqwest), not available on wasm.
+        #[cfg(not(target_arch = "wasm32"))]
+        app.add_systems(Startup, fetch_server_challenge)
+            .add_systems(Update, poll_server_challenge);
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 /// Startup system: spawns an async task to fetch the server's daily challenge.
 ///
 /// Only runs when `SyncProviderResource` is present (i.e. `SyncPlugin` is
@@ -142,6 +154,7 @@ fn fetch_server_challenge(
    task_res.0 = Some(task);
 }

+#[cfg(not(target_arch = "wasm32"))]
 /// Update system: polls the server-challenge fetch task.
 ///
 /// On success, replaces the locally-computed seed in `DailyChallengeResource`
@@ -14,7 +14,7 @@
 //! because the starting position is effectively random (player-chosen timing
 //! determines which seed in the 40-entry catalog they start at).

-use std::time::{SystemTime, UNIX_EPOCH};
+use chrono::Utc;

 use bevy::prelude::*;
 use solitaire_core::game_state::{DifficultyLevel, GameMode};
@@ -104,10 +104,9 @@ fn handle_difficulty_request(
 }

 fn seed_from_system_time() -> u64 {
-    SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .map(|d| d.as_nanos() as u64)
-        .unwrap_or(0xD1FF_0000_DEAD_BEEF)
+    // Use chrono so this works on wasm32 (chrono has the `wasmbind` feature;
+    // std::time::SystemTime panics on wasm32-unknown-unknown).
+    Utc::now().timestamp_nanos_opt().unwrap_or(0) as u64
 }

 // ---------------------------------------------------------------------------
@@ -1,9 +1,9 @@
 //! Cross-system events used by the engine's plugins.

 use bevy::prelude::Message;
+use klondike::KlondikePile;
 use solitaire_core::card::Suit;
 use solitaire_core::game_state::GameMode;
-use solitaire_core::pile::PileType;
 use solitaire_data::AchievementRecord;
 use solitaire_sync::SyncResponse;

@@ -11,8 +11,8 @@ use solitaire_sync::SyncResponse;
 /// consumed by `GamePlugin`.
 #[derive(Message, Debug, Clone)]
 pub struct MoveRequestEvent {
-    pub from: PileType,
-    pub to: PileType,
+    pub from: KlondikePile,
+    pub to: KlondikePile,
    pub count: usize,
 }

@@ -49,8 +49,8 @@ pub struct StateChangedEvent;
 /// `card_invalid.wav` SFX. Not fired for drops in empty space.
 #[derive(Message, Debug, Clone)]
 pub struct MoveRejectedEvent {
-    pub from: PileType,
-    pub to: PileType,
+    pub from: KlondikePile,
+    pub to: KlondikePile,
    pub count: usize,
 }

@@ -302,5 +302,5 @@ pub struct HintVisualEvent {
    /// The `Card::id` of the source card to be highlighted.
    pub source_card_id: u32,
    /// The destination pile whose `PileMarker` should be tinted gold.
-    pub dest_pile: solitaire_core::pile::PileType,
+    pub dest_pile: KlondikePile,
 }
@@ -42,7 +42,8 @@ use std::f32::consts::PI;
 use std::hash::{Hash, Hasher};

 use bevy::prelude::*;
-use solitaire_core::pile::PileType;
+use bevy::window::RequestRedraw;
+use klondike::{Foundation, KlondikePile};
 use solitaire_data::AnimSpeed;

 use crate::animation_plugin::CardAnim;
@@ -204,6 +205,7 @@ impl Plugin for FeedbackAnimPlugin {
            .add_message::<MoveRejectedEvent>()
            .add_message::<NewGameRequestEvent>()
            .add_message::<FoundationCompletedEvent>()
+            .add_message::<RequestRedraw>()
            .add_systems(
                Update,
                (
@@ -244,10 +246,8 @@ fn start_shake_anim(
        }
        let dest_pile = &ev.to;
        // Collect the card ids that belong to the destination pile.
-        let Some(pile) = game.0.piles.get(dest_pile) else {
-            continue;
-        };
-        let dest_card_ids: Vec<u32> = pile.cards.iter().map(|c| c.id).collect();
+        let dest_cards = pile_cards(&game.0, dest_pile);
+        let dest_card_ids: Vec<u32> = dest_cards.iter().map(|c| c.id).collect();

        if dest_card_ids.is_empty() {
            continue;
@@ -317,19 +317,19 @@ fn start_settle_anim(
    let mut bounce_ids: Vec<u32> = Vec::new();

    for ev in moves.read() {
-        if let Some(pile) = game.0.piles.get(&ev.to) {
+        let pile = pile_cards(&game.0, &ev.to);
+        if !pile.is_empty() {
            // The moved cards land on top — take the last `count` ids.
-            let n = ev.count.min(pile.cards.len());
+            let n = ev.count.min(pile.len());
            if n > 0 {
-                let start = pile.cards.len() - n;
-                bounce_ids.extend(pile.cards[start..].iter().map(|c| c.id));
+                let start = pile.len() - n;
+                bounce_ids.extend(pile[start..].iter().map(|c| c.id));
            }
        }
    }

    if draws.read().next().is_some()
-        && let Some(pile) = game.0.piles.get(&PileType::Waste)
-        && let Some(top) = pile.cards.last()
+        && let Some(top) = game.0.waste_cards().last()
    {
        bounce_ids.push(top.id);
    }
@@ -397,7 +397,7 @@ fn start_deal_anim(
        return;
    }
    let Some(layout) = layout else { return };
-    let Some(&stock_pos) = layout.0.pile_positions.get(&PileType::Stock) else {
+    let Some(&stock_pos) = layout.0.pile_positions.get(&KlondikePile::Stock) else {
        return;
    };
    let stock_start = Vec3::new(stock_pos.x, stock_pos.y, 0.0);
@@ -518,15 +518,13 @@ fn start_foundation_flourish(
        if reduce_motion {
            continue;
        }
-        let pile_type = PileType::Foundation(ev.slot);
+        let Some(foundation) = foundation_from_slot(ev.slot) else {
+            continue;
+        };
+        let pile_type = KlondikePile::Foundation(foundation);
        // Top card of the completed foundation is the King.
-        let Some(king_id) = game
-            .0
-            .piles
-            .get(&pile_type)
-            .and_then(|p| p.cards.last())
-            .map(|c| c.id)
-        else {
+        let cards = game.0.pile(pile_type);
+        let Some(king_id) = cards.last().map(|c| c.id) else {
            continue;
        };

@@ -632,6 +630,26 @@ fn lerp_color(from: Color, to: Color, t: f32) -> Color {
    )
 }

+fn pile_cards(
+    game: &solitaire_core::game_state::GameState,
+    pile: &KlondikePile,
+) -> Vec<solitaire_core::card::Card> {
+    match pile {
+        KlondikePile::Stock => game.waste_cards(),
+        _ => game.pile(*pile),
+    }
+}
+
+fn foundation_from_slot(slot: u8) -> Option<Foundation> {
+    match slot {
+        0 => Some(Foundation::Foundation1),
+        1 => Some(Foundation::Foundation2),
+        2 => Some(Foundation::Foundation3),
+        3 => Some(Foundation::Foundation4),
+        _ => None,
+    }
+}
+
 // ---------------------------------------------------------------------------
 // Unit tests (pure functions only — no Bevy world required)
 // ---------------------------------------------------------------------------
@@ -832,6 +850,7 @@ mod tests {
    fn shake_anim_skipped_under_reduce_motion() {
        use bevy::ecs::message::Messages;
        use solitaire_core::game_state::{DrawMode, GameState};
+        use klondike::Tableau;
        use solitaire_data::Settings;

        let mut app = App::new();
@@ -845,14 +864,13 @@ mod tests {
        app.update();

        // Pick a card from Tableau(0) so the event refers to a real pile.
-        let dest_pile = PileType::Tableau(0);
+        let dest_pile = KlondikePile::Tableau(Tableau::Tableau1);
        let card_id = app
            .world()
            .resource::<GameStateResource>()
            .0
-            .piles
-            .get(&dest_pile)
-            .and_then(|p| p.cards.last())
+            .pile(dest_pile)
+            .last()
            .map(|c| c.id)
            .expect("Tableau(0) should have at least one card in a fresh game");

@@ -864,7 +882,7 @@ mod tests {
        app.world_mut()
            .resource_mut::<Messages<MoveRejectedEvent>>()
            .write(MoveRejectedEvent {
-                from: PileType::Stock,
+                from: KlondikePile::Stock,
                to: dest_pile,
                count: 1,
            });
@@ -8,12 +8,19 @@

 use bevy::prelude::*;
 use bevy::window::WindowResized;
+use klondike::{Foundation, KlondikePile, Tableau};
 use solitaire_core::card::Suit;
 use solitaire_core::game_state::{DrawMode, GameMode};
-use solitaire_core::pile::PileType;

 use crate::auto_complete_plugin::AutoCompleteState;
+#[cfg(not(target_arch = "wasm32"))]
 use crate::avatar_plugin::AvatarResource;
+// On wasm32 AvatarPlugin is gated out; define a placeholder type so the
+// Option<Res<AvatarResource>> parameters below compile without changes.
+// The resource is never inserted on wasm, so every call resolves to None.
+#[cfg(target_arch = "wasm32")]
+#[derive(bevy::prelude::Resource)]
+struct AvatarResource(Option<bevy::prelude::Handle<bevy::prelude::Image>>);
 use crate::challenge_plugin::CHALLENGE_UNLOCK_LEVEL;
 use crate::daily_challenge_plugin::DailyChallengeResource;
 use crate::events::{
@@ -2316,7 +2323,7 @@ fn update_hud(
                // Hide when not in Draw-Three or after the game is won.
                String::new()
            } else {
-                let stock_len = g.piles[&solitaire_core::pile::PileType::Stock].cards.len();
+                let stock_len = g.stock_cards().len();
                let next_draw = stock_len.min(3);
                format!("Cycle: {next_draw}/3")
            };
@@ -2380,15 +2387,14 @@ fn update_selection_hud(
    let Ok(mut t) = q.single_mut() else { return };
    let label = match selection.as_deref().and_then(|s| s.selected_pile.as_ref()) {
        None => String::new(),
-        Some(PileType::Waste) => "▶ Waste".to_string(),
-        Some(PileType::Stock) => "▶ Stock".to_string(),
-        Some(PileType::Foundation(slot)) => match game.as_deref() {
+        Some(KlondikePile::Stock) => "▶ Waste".to_string(),
+        Some(KlondikePile::Foundation(slot)) => match game.as_deref() {
            Some(g) => foundation_selection_label(*slot, &g.0),
            // No game resource means we can't probe claimed_suit; show the
            // slot-based placeholder so the HUD still surfaces the selection.
-            None => format!("▶ Foundation {}", slot + 1),
+            None => format!("▶ Foundation {}", foundation_number(*slot)),
        },
-        Some(PileType::Tableau(idx)) => format!("▶ Column {}", idx + 1),
+        Some(KlondikePile::Tableau(idx)) => format!("▶ Column {}", tableau_number(*idx)),
    };
    **t = label;
 }
@@ -2398,11 +2404,11 @@ fn update_selection_hud(
 /// When the slot has a claimed suit (any card has landed) the announcement is
 /// "▶ {Suit} Foundation"; while the slot is empty it falls back to a
 /// "▶ Foundation N" placeholder labelled by the 1-based slot index.
-fn foundation_selection_label(slot: u8, game: &solitaire_core::game_state::GameState) -> String {
+fn foundation_selection_label(slot: Foundation, game: &solitaire_core::game_state::GameState) -> String {
    let claimed = game
-        .piles
-        .get(&PileType::Foundation(slot))
-        .and_then(|p| p.claimed_suit());
+        .pile(KlondikePile::Foundation(slot))
+        .first()
+        .map(|c| c.suit);
    match claimed {
        Some(suit) => {
            let s = match suit {
@@ -2413,7 +2419,28 @@ fn foundation_selection_label(slot: u8, game: &solitaire_core::game_state::GameS
            };
            format!("▶ {s} Foundation")
        }
-        None => format!("▶ Foundation {}", slot + 1),
+        None => format!("▶ Foundation {}", foundation_number(slot)),
+    }
+}
+
+const fn foundation_number(foundation: Foundation) -> u8 {
+    match foundation {
+        Foundation::Foundation1 => 1,
+        Foundation::Foundation2 => 2,
+        Foundation::Foundation3 => 3,
+        Foundation::Foundation4 => 4,
+    }
+}
+
+const fn tableau_number(tableau: Tableau) -> u8 {
+    match tableau {
+        Tableau::Tableau1 => 1,
+        Tableau::Tableau2 => 2,
+        Tableau::Tableau3 => 3,
+        Tableau::Tableau4 => 4,
+        Tableau::Tableau5 => 5,
+        Tableau::Tableau6 => 6,
+        Tableau::Tableau7 => 7,
    }
 }

@@ -7,7 +7,7 @@ use std::collections::HashMap;

 use bevy::math::Vec2;
 use bevy::prelude::{Resource, SystemSet};
-use solitaire_core::pile::PileType;
+use klondike::{Foundation, KlondikePile, Tableau};

 /// Schedule labels for layout-related systems so cross-plugin ordering is
 /// explicit instead of relying on Bevy's automatic resource-conflict ordering
@@ -138,9 +138,9 @@ pub struct Layout {
    /// Centre position of each pile, in 2D world coordinates.
    ///
    /// World origin `(0, 0)` is the window centre; `+x` is right, `+y` is up.
-    /// Every `PileType` (Stock, Waste, four Foundations, seven Tableaux) has an
+    /// Every `KlondikePile` (Stock, Waste, four Foundations, seven Tableaux) has an
    /// entry. The map always contains exactly 13 entries after `compute_layout`.
-    pub pile_positions: HashMap<PileType, Vec2>,
+    pub pile_positions: HashMap<KlondikePile, Vec2>,
    /// Per-step vertical offset fraction for face-up tableau cards, as a
    /// fraction of `card_size.y`. On height-limited (desktop) windows this
    /// equals `TABLEAU_FAN_FRAC` (0.18); on width-limited (portrait phone)
@@ -241,21 +241,35 @@ pub fn compute_layout(
    let top_y = window.y / 2.0 - safe_area_top - band_h - h_gap - card_height / 2.0;
    let tableau_y = top_y - card_height - vertical_gap;

-    let mut pile_positions: HashMap<PileType, Vec2> = HashMap::with_capacity(13);
+    let mut pile_positions: HashMap<KlondikePile, Vec2> = HashMap::with_capacity(13);

-    pile_positions.insert(PileType::Stock, Vec2::new(col_x(0), top_y));
-    pile_positions.insert(PileType::Waste, Vec2::new(col_x(1), top_y));
+    pile_positions.insert(KlondikePile::Stock, Vec2::new(col_x(1), top_y));

    // Column 2 is skipped — visual separation between waste and foundations.
    for slot in 0..4_u8 {
+        let foundation = match slot {
+            0 => Foundation::Foundation1,
+            1 => Foundation::Foundation2,
+            2 => Foundation::Foundation3,
+            _ => Foundation::Foundation4,
+        };
        pile_positions.insert(
-            PileType::Foundation(slot),
+            KlondikePile::Foundation(foundation),
            Vec2::new(col_x(3 + slot as usize), top_y),
        );
    }

    for i in 0..7 {
-        pile_positions.insert(PileType::Tableau(i), Vec2::new(col_x(i), tableau_y));
+        let tableau = match i {
+            0 => Tableau::Tableau1,
+            1 => Tableau::Tableau2,
+            2 => Tableau::Tableau3,
+            3 => Tableau::Tableau4,
+            4 => Tableau::Tableau5,
+            5 => Tableau::Tableau6,
+            _ => Tableau::Tableau7,
+        };
+        pile_positions.insert(KlondikePile::Tableau(tableau), Vec2::new(col_x(i), tableau_y));
    }

    // Adaptive tableau fan fraction. On height-limited (desktop) windows the
@@ -301,23 +315,35 @@ mod tests {
    use super::*;

    fn assert_all_piles_present(layout: &Layout) {
-        assert!(layout.pile_positions.contains_key(&PileType::Stock));
-        assert!(layout.pile_positions.contains_key(&PileType::Waste));
-        for slot in 0..4_u8 {
+        assert!(layout.pile_positions.contains_key(&KlondikePile::Stock));
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
            assert!(
                layout
                    .pile_positions
-                    .contains_key(&PileType::Foundation(slot)),
-                "missing foundation slot {slot}",
+                    .contains_key(&KlondikePile::Foundation(foundation)),
+                "missing foundation slot {foundation:?}",
            );
        }
-        for i in 0..7 {
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
            assert!(
-                layout.pile_positions.contains_key(&PileType::Tableau(i)),
-                "missing tableau {i}"
+                layout.pile_positions.contains_key(&KlondikePile::Tableau(tableau)),
+                "missing tableau {tableau:?}"
            );
        }
-        assert_eq!(layout.pile_positions.len(), 13);
+        assert_eq!(layout.pile_positions.len(), 12);
    }

    #[test]
@@ -376,9 +402,18 @@ mod tests {
    #[test]
    fn tableau_columns_are_sorted_left_to_right() {
        let layout = compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
-        for i in 0..6 {
-            let lhs = layout.pile_positions[&PileType::Tableau(i)].x;
-            let rhs = layout.pile_positions[&PileType::Tableau(i + 1)].x;
+        let tableaus = [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ];
+        for i in 0..tableaus.len() - 1 {
+            let lhs = layout.pile_positions[&KlondikePile::Tableau(tableaus[i])].x;
+            let rhs = layout.pile_positions[&KlondikePile::Tableau(tableaus[i + 1])].x;
            assert!(lhs < rhs, "tableau {i} should be left of tableau {}", i + 1);
        }
    }
@@ -386,8 +421,8 @@ mod tests {
    #[test]
    fn top_row_is_above_tableau_row() {
        let layout = compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
-        let stock_y = layout.pile_positions[&PileType::Stock].y;
-        let tableau_y = layout.pile_positions[&PileType::Tableau(0)].y;
+        let stock_y = layout.pile_positions[&KlondikePile::Stock].y;
+        let tableau_y = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau1)].y;
        assert!(stock_y > tableau_y);
    }

@@ -399,7 +434,7 @@ mod tests {
    fn top_row_clears_hud_band() {
        let window = Vec2::new(1280.0, 800.0);
        let layout = compute_layout(window, 0.0, 0.0, true);
-        let stock_y = layout.pile_positions[&PileType::Stock].y;
+        let stock_y = layout.pile_positions[&KlondikePile::Stock].y;
        let card_top = stock_y + layout.card_size.y / 2.0;
        let band_bottom = window.y / 2.0 - HUD_BAND_HEIGHT;
        assert!(
@@ -411,24 +446,35 @@ mod tests {
    #[test]
    fn stock_aligns_with_tableau_col_0_and_waste_with_col_1() {
        let layout = compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
-        let stock_x = layout.pile_positions[&PileType::Stock].x;
-        let waste_x = layout.pile_positions[&PileType::Waste].x;
-        let t0_x = layout.pile_positions[&PileType::Tableau(0)].x;
-        let t1_x = layout.pile_positions[&PileType::Tableau(1)].x;
-        assert!((stock_x - t0_x).abs() < 1e-5);
-        assert!((waste_x - t1_x).abs() < 1e-5);
+        let stock_x = layout.pile_positions[&KlondikePile::Stock].x;
+        let t1_x = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau2)].x;
+        assert!((stock_x - t1_x).abs() < 1e-5);
    }

    #[test]
    fn foundations_align_with_tableau_cols_3_to_6() {
        let layout = compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
-        for slot in 0..4_u8 {
-            let f_x = layout.pile_positions[&PileType::Foundation(slot)].x;
-            let t_x = layout.pile_positions[&PileType::Tableau(3 + slot as usize)].x;
+        let target_tableaus = [
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ];
+        for (idx, foundation) in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ]
+        .iter()
+        .enumerate()
+        {
+            let f_x = layout.pile_positions[&KlondikePile::Foundation(*foundation)].x;
+            let t_x = layout.pile_positions[&KlondikePile::Tableau(target_tableaus[idx])].x;
            assert!(
                (f_x - t_x).abs() < 1e-5,
-                "foundation slot {slot} should align with tableau {}",
-                3 + slot as usize,
+                "foundation slot {idx} should align with tableau {}",
+                3 + idx,
            );
        }
    }
@@ -470,7 +516,7 @@ mod tests {
        // Default app resolution (see solitaire_app/src/main.rs).
        let window = Vec2::new(1280.0, 800.0);
        let layout = compute_layout(window, 0.0, 0.0, true);
-        let tableau_y = layout.pile_positions[&PileType::Tableau(6)].y;
+        let tableau_y = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau7)].y;
        let card_h = layout.card_size.y;
        // Bottom edge of the 13th fanned face-up card.
        let bottom_edge = tableau_y - 12.0 * card_h * TABLEAU_FAN_FRAC - card_h / 2.0;
@@ -489,7 +535,7 @@ mod tests {
        // The bug originally reproduced at 1920x1080. Lock in a regression test.
        let window = Vec2::new(1920.0, 1080.0);
        let layout = compute_layout(window, 0.0, 0.0, true);
-        let tableau_y = layout.pile_positions[&PileType::Tableau(6)].y;
+        let tableau_y = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau7)].y;
        let card_h = layout.card_size.y;
        let bottom_edge = tableau_y - 12.0 * card_h * TABLEAU_FAN_FRAC - card_h / 2.0;
        let h_gap = layout.card_size.x / 4.0;
@@ -520,7 +566,7 @@ mod tests {
    fn expanded_fan_fits_phone_viewport() {
        let window = Vec2::new(360.0, 800.0);
        let layout = compute_layout(window, 0.0, 0.0, true);
-        let tableau_y = layout.pile_positions[&PileType::Tableau(0)].y;
+        let tableau_y = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau1)].y;
        let card_h = layout.card_size.y;
        let h_gap = layout.card_size.x / 4.0;
        // Bottom of the 13th (worst-case) fanned face-up card.
@@ -579,8 +625,8 @@ mod tests {
        let window = Vec2::new(360.0, 800.0);
        let without = compute_layout(window, 0.0, 0.0, true);
        let with_inset = compute_layout(window, 32.0, 0.0, true);
-        let stock_no_inset = without.pile_positions[&PileType::Stock].y;
-        let stock_with_inset = with_inset.pile_positions[&PileType::Stock].y;
+        let stock_no_inset = without.pile_positions[&KlondikePile::Stock].y;
+        let stock_with_inset = with_inset.pile_positions[&KlondikePile::Stock].y;
        assert!(
            stock_with_inset < stock_no_inset,
            "safe_area_top=32 must shift stock pile down (y decreased): {} → {}",
@@ -602,10 +648,10 @@ mod tests {
        let without = compute_layout(window, 0.0, 0.0, true);
        let with_inset = compute_layout(window, 32.0, 0.0, true);
        for pile in [
-            PileType::Stock,
-            PileType::Waste,
-            PileType::Tableau(0),
-            PileType::Tableau(6),
+            KlondikePile::Stock,
+            KlondikePile::Stock,
+            KlondikePile::Tableau(Tableau::Tableau1),
+            KlondikePile::Tableau(Tableau::Tableau7),
        ] {
            assert!(
                (without.pile_positions[&pile].x - with_inset.pile_positions[&pile].x).abs() < 1e-3,
@@ -628,7 +674,7 @@ mod tests {
            with_inset.tableau_fan_frac,
        );
        let card_h = with_inset.card_size.y;
-        let tableau_y = with_inset.pile_positions[&PileType::Tableau(6)].y;
+        let tableau_y = with_inset.pile_positions[&KlondikePile::Tableau(Tableau::Tableau7)].y;
        let bottom_edge = tableau_y - 12.0 * card_h * with_inset.tableau_fan_frac - card_h / 2.0;
        let h_gap = with_inset.card_size.x / 4.0;
        let margin = -window.y / 2.0 + 48.0 + h_gap;
@@ -661,8 +707,8 @@ mod tests {

        // Verify the "wrong" layout actually differs — the bug would push the
        // top card row upward by exactly safe_top pixels.
-        let fresh_stock_y = fresh.pile_positions[&PileType::Stock].y;
-        let wrong_stock_y = wrong.pile_positions[&PileType::Stock].y;
+        let fresh_stock_y = fresh.pile_positions[&KlondikePile::Stock].y;
+        let wrong_stock_y = wrong.pile_positions[&KlondikePile::Stock].y;
        // In Bevy's +y-is-up system, adding safe_area_top pushes the stock
        // downward (−y direction).  So wrong_stock_y > fresh_stock_y by safe_top.
        assert!(
@@ -680,14 +726,14 @@ mod tests {
            "card size must be preserved after resume",
        );
        assert!(
-            (corrected.pile_positions[&PileType::Stock].y - fresh_stock_y).abs() < 1e-3,
+            (corrected.pile_positions[&KlondikePile::Stock].y - fresh_stock_y).abs() < 1e-3,
            "stock y must match fresh launch after resume: \
             corrected={:.2} fresh={fresh_stock_y:.2}",
-            corrected.pile_positions[&PileType::Stock].y,
+            corrected.pile_positions[&KlondikePile::Stock].y,
        );
        assert!(
-            (corrected.pile_positions[&PileType::Stock].x
-                - fresh.pile_positions[&PileType::Stock].x)
+            (corrected.pile_positions[&KlondikePile::Stock].x
+                - fresh.pile_positions[&KlondikePile::Stock].x)
                .abs()
                < 1e-3,
            "stock x must be unchanged after resume",
@@ -695,7 +741,7 @@ mod tests {
        // The HUD band top clearance (distance from window top to card top)
        // must match as well — this is the quantity directly visible in Bug 2.
        let card_top = |layout: &super::Layout| {
-            layout.pile_positions[&PileType::Stock].y + layout.card_size.y / 2.0
+            layout.pile_positions[&KlondikePile::Stock].y + layout.card_size.y / 2.0
        };
        assert!(
            (card_top(&corrected) - card_top(&fresh)).abs() < 1e-3,
@@ -712,7 +758,7 @@ mod tests {
        let window = Vec2::new(360.0, 800.0);
        let without = compute_layout(window, 0.0, 0.0, true);
        let with_inset = compute_layout(window, 0.0, 48.0, true);
-        for pile in [PileType::Stock, PileType::Tableau(0), PileType::Tableau(6)] {
+        for pile in [KlondikePile::Stock, KlondikePile::Tableau(Tableau::Tableau1), KlondikePile::Tableau(Tableau::Tableau7)] {
            assert!(
                (without.pile_positions[&pile].x - with_inset.pile_positions[&pile].x).abs() < 1e-3,
                "{pile:?} x-position must not change with safe_area_bottom",
@@ -191,6 +191,7 @@ fn toggle_leaderboard_screen(
    keys: Res<ButtonInput<KeyCode>>,
    mut requests: MessageReader<ToggleLeaderboardRequestEvent>,
    screens: Query<Entity, With<LeaderboardScreen>>,
+    other_modal_scrims: Query<(), (With<ModalScrim>, Without<LeaderboardScreen>)>,
    data: Res<LeaderboardResource>,
    provider: Option<Res<SyncProviderResource>>,
    settings: Option<Res<SettingsResource>>,
@@ -208,6 +209,11 @@ fn toggle_leaderboard_screen(
        return;
    }

+    // Don't stack a second modal scrim over one that is already open.
+    if !other_modal_scrims.is_empty() {
+        return;
+    }
+
    // Spawn the panel immediately with whatever data we have so far.
    let remote_available = provider
        .as_ref()
@@ -1,13 +1,16 @@
 //! Bevy integration layer for Ferrous Solitaire.

 pub mod achievement_plugin;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod analytics_plugin;
 #[cfg(target_os = "android")]
 pub mod android_clipboard;
 pub mod animation_plugin;
 pub mod assets;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod audio_plugin;
 pub mod auto_complete_plugin;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod avatar_plugin;
 pub mod card_animation;
 pub mod card_plugin;
@@ -26,6 +29,7 @@ pub mod home_plugin;
 pub mod hud_plugin;
 pub mod input_plugin;
 pub mod layout;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod leaderboard_plugin;
 pub mod onboarding_plugin;
 pub mod pause_plugin;
@@ -43,7 +47,9 @@ pub mod selection_plugin;
 pub mod settings_plugin;
 pub mod splash_plugin;
 pub mod stats_plugin;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod sync_plugin;
+#[cfg(not(target_arch = "wasm32"))]
 pub mod sync_setup_plugin;
 pub mod table_plugin;
 pub mod theme;
@@ -57,14 +63,17 @@ pub mod weekly_goals_plugin;
 pub mod win_summary_plugin;

 pub use achievement_plugin::{AchievementPlugin, AchievementsResource, AchievementsScreen};
+#[cfg(not(target_arch = "wasm32"))]
 pub use analytics_plugin::{AnalyticsPlugin, AnalyticsResource};
 pub use animation_plugin::{ActiveToast, AnimationPlugin, CardAnim, ToastEntity, ToastQueue};
 pub use assets::{
    AssetSourcesPlugin, DARK_THEME_MANIFEST_URL, USER_THEMES, bundled_theme_url,
    populate_embedded_dark_theme, register_theme_asset_sources,
 };
+#[cfg(not(target_arch = "wasm32"))]
 pub use audio_plugin::{AudioPlugin, AudioState, SoundLibrary};
 pub use auto_complete_plugin::AutoCompletePlugin;
+#[cfg(not(target_arch = "wasm32"))]
 pub use avatar_plugin::{AvatarFetchEvent, AvatarPlugin, AvatarResource};
 pub use card_animation::{
    AnimationChain, AnimationTuning, BufferedInput, CardAnimation, CardAnimationPlugin,
@@ -117,6 +126,7 @@ pub use hud_plugin::{
 };
 pub use input_plugin::InputPlugin;
 pub use layout::{Layout, LayoutResource, compute_layout};
+#[cfg(not(target_arch = "wasm32"))]
 pub use leaderboard_plugin::{LeaderboardPlugin, LeaderboardResource, LeaderboardScreen};
 pub use onboarding_plugin::{OnboardingPlugin, OnboardingScreen};
 pub use pause_plugin::{ForfeitConfirmScreen, PausePlugin, PauseScreen, PausedResource};
@@ -155,7 +165,9 @@ pub use stats_plugin::{
    ReplaySelectorCaption, SelectedReplayIndex, StatsPlugin, StatsResource, StatsScreen,
    StatsUpdate, WatchReplayButton, format_replay_caption,
 };
+#[cfg(not(target_arch = "wasm32"))]
 pub use sync_plugin::{SyncPlugin, SyncProviderResource};
+#[cfg(not(target_arch = "wasm32"))]
 pub use sync_setup_plugin::SyncSetupPlugin;
 pub use table_plugin::{
    BackgroundImageSet, HintPileHighlight, PileMarker, TableBackground, TablePlugin,
@@ -27,7 +27,7 @@
 use bevy::prelude::*;
 use bevy::tasks::{AsyncComputeTaskPool, Task, futures_lite::future};
 use solitaire_core::game_state::GameState;
-use solitaire_core::pile::PileType;
+use klondike::KlondikePile;
 use solitaire_core::solver::{SolverConfig, SolverResult, try_solve_from_state};

 use crate::card_plugin::CardEntity;
@@ -101,7 +101,7 @@ struct HintTask {
 enum HintTaskOutput {
    /// Solver verdict was `Winnable`; here is the first move on the
    /// solution path.
-    SolverMove { from: PileType, to: PileType },
+    SolverMove { from: KlondikePile, to: KlondikePile },
    /// Solver was `Unwinnable` or `Inconclusive`. The poll system
    /// runs the legacy heuristic against the live `GameState` so the
    /// H key always produces feedback while any legal move exists.
@@ -183,6 +183,7 @@ mod tests {
    use super::*;
    use crate::events::HintVisualEvent;
    use crate::input_plugin::HintSolverConfig;
+    use klondike::{Foundation, Tableau};
    use solitaire_core::card::{Card, Rank, Suit};
    use solitaire_core::game_state::{DrawMode, GameState};

@@ -214,22 +215,27 @@ mod tests {
    /// tableau columns 0..3, stock and waste empty.
    fn near_finished_state() -> GameState {
        let mut game = GameState::new(1, DrawMode::DrawOne);
-        for slot in 0..4_u8 {
-            game.piles
-                .get_mut(&PileType::Foundation(slot))
-                .unwrap()
-                .cards
-                .clear();
+        game.set_test_stock_cards(Vec::new());
+        game.set_test_waste_cards(Vec::new());
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            game.set_test_foundation_cards(foundation, Vec::new());
        }
-        for i in 0..7_usize {
-            game.piles
-                .get_mut(&PileType::Tableau(i))
-                .unwrap()
-                .cards
-                .clear();
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
+            game.set_test_tableau_cards(tableau, Vec::new());
        }
-        game.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
-        game.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
        let suits = [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades];
        let ranks_below_king = [
            Rank::Ace,
@@ -245,31 +251,44 @@ mod tests {
            Rank::Jack,
            Rank::Queen,
        ];
-        for (slot, suit) in suits.iter().enumerate() {
-            let pile = game
-                .piles
-                .get_mut(&PileType::Foundation(slot as u8))
-                .unwrap();
+        for (foundation, suit) in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ]
+        .into_iter()
+        .zip(suits.iter())
+        {
+            let mut cards = Vec::new();
            for (i, rank) in ranks_below_king.iter().enumerate() {
-                pile.cards.push(Card {
-                    id: (slot as u32) * 13 + i as u32,
+                cards.push(Card {
+                    id: (foundation as u32) * 13 + i as u32,
                    suit: *suit,
                    rank: *rank,
                    face_up: true,
                });
            }
+            game.set_test_foundation_cards(foundation, cards);
        }
-        for (col, suit) in suits.iter().enumerate() {
-            game.piles
-                .get_mut(&PileType::Tableau(col))
-                .unwrap()
-                .cards
-                .push(Card {
-                    id: 100 + col as u32,
+        for (tableau, suit) in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+        ]
+        .into_iter()
+        .zip(suits.iter())
+        {
+            game.set_test_tableau_cards(
+                tableau,
+                vec![Card {
+                    id: 100 + tableau as u32,
                    suit: *suit,
                    rank: Rank::King,
                    face_up: true,
-                });
+                }],
+            );
        }
        game
    }
@@ -309,7 +328,7 @@ mod tests {
            "exactly one HintVisualEvent must fire when the solver returns Winnable",
        );
        assert!(
-            matches!(collected[0].dest_pile, PileType::Foundation(_)),
+            matches!(collected[0].dest_pile, KlondikePile::Foundation(_)),
            "solver hint destination must be a foundation slot; got {:?}",
            collected[0].dest_pile,
        );
@@ -12,7 +12,11 @@ use solitaire_core::achievement::{ALL_ACHIEVEMENTS, achievement_by_id};
 use solitaire_data::SyncBackend;

 use crate::achievement_plugin::AchievementsResource;
+#[cfg(not(target_arch = "wasm32"))]
 use crate::avatar_plugin::AvatarResource;
+#[cfg(target_arch = "wasm32")]
+#[derive(bevy::prelude::Resource)]
+struct AvatarResource(Option<bevy::prelude::Handle<bevy::prelude::Image>>);
 use crate::events::ToggleProfileRequestEvent;
 use crate::font_plugin::FontResource;
 use crate::progress_plugin::ProgressResource;
@@ -47,13 +47,12 @@ use bevy::input::touch::Touches;
 use bevy::math::Vec2;
 use bevy::prelude::*;
 use bevy::window::PrimaryWindow;
+use klondike::{Foundation, KlondikePile, Tableau};
 use solitaire_core::card::Card;
 use solitaire_core::game_state::GameState;
-use solitaire_core::pile::PileType;
-use solitaire_core::rules::{can_place_on_foundation, can_place_on_tableau};

 use crate::card_plugin::TABLEAU_FACEDOWN_FAN_FRAC;
-use crate::events::MoveRequestEvent;
+use crate::events::{MoveRejectedEvent, MoveRequestEvent};
 use crate::layout::{Layout, LayoutResource, TABLEAU_FAN_FRAC};
 use crate::pause_plugin::PausedResource;
 use crate::resources::{DragState, GameStateResource};
@@ -108,7 +107,7 @@ pub enum RightClickRadialState {
    /// `hovered_index` (or none).
    Active {
        /// Pile the right-clicked card came from.
-        source_pile: PileType,
+        source_pile: KlondikePile,
        /// Number of cards that would be moved (always `1` — only the
        /// top face-up card is ever offered for a quick-drop, since the
        /// radial is built around single-card foundation/tableau
@@ -123,7 +122,7 @@ pub enum RightClickRadialState {
        /// [`RADIAL_RADIUS_PX`] centred on the press position. A single
        /// destination is placed directly above the cursor; multiple
        /// destinations span an arc.
-        legal_destinations: Vec<(PileType, Vec2)>,
+        legal_destinations: Vec<(KlondikePile, Vec2)>,
        /// Cursor position (world space) the radial was opened at —
        /// used as the centre of the ring for cursor-hover hit testing.
        centre: Vec2,
@@ -250,30 +249,20 @@ pub fn radial_hovered_index(cursor: Vec2, anchors: &[Vec2]) -> Option<usize> {
 /// that legally accept the card. The source pile is excluded because
 /// dropping a card on its own pile is a no-op.
 pub fn legal_destinations_for_card(
-    card: &Card,
-    source_pile: &PileType,
+    _card: &Card,
+    source_pile: &KlondikePile,
    game: &GameState,
-) -> Vec<PileType> {
+) -> Vec<KlondikePile> {
    let mut out = Vec::new();
-    for slot in 0..4_u8 {
-        let dest = PileType::Foundation(slot);
-        if dest == *source_pile {
-            continue;
-        }
-        if let Some(pile) = game.piles.get(&dest)
-            && can_place_on_foundation(card, pile)
-        {
+    for foundation in foundations() {
+        let dest = KlondikePile::Foundation(foundation);
+        if game.can_move_cards(source_pile, &dest, 1) {
            out.push(dest);
        }
    }
-    for i in 0..7_usize {
-        let dest = PileType::Tableau(i);
-        if dest == *source_pile {
-            continue;
-        }
-        if let Some(pile) = game.piles.get(&dest)
-            && can_place_on_tableau(card, pile)
-        {
+    for tableau in tableaus() {
+        let dest = KlondikePile::Tableau(tableau);
+        if game.can_move_cards(source_pile, &dest, 1) {
            out.push(dest);
        }
    }
@@ -292,36 +281,34 @@ pub fn find_top_face_up_card_at(
    cursor: Vec2,
    game: &GameState,
    layout: &Layout,
-) -> Option<(PileType, Card)> {
+) -> Option<(KlondikePile, Card)> {
    let piles = [
-        PileType::Waste,
-        PileType::Foundation(0),
-        PileType::Foundation(1),
-        PileType::Foundation(2),
-        PileType::Foundation(3),
-        PileType::Tableau(0),
-        PileType::Tableau(1),
-        PileType::Tableau(2),
-        PileType::Tableau(3),
-        PileType::Tableau(4),
-        PileType::Tableau(5),
-        PileType::Tableau(6),
+        KlondikePile::Stock,
+        KlondikePile::Foundation(Foundation::Foundation1),
+        KlondikePile::Foundation(Foundation::Foundation2),
+        KlondikePile::Foundation(Foundation::Foundation3),
+        KlondikePile::Foundation(Foundation::Foundation4),
+        KlondikePile::Tableau(Tableau::Tableau1),
+        KlondikePile::Tableau(Tableau::Tableau2),
+        KlondikePile::Tableau(Tableau::Tableau3),
+        KlondikePile::Tableau(Tableau::Tableau4),
+        KlondikePile::Tableau(Tableau::Tableau5),
+        KlondikePile::Tableau(Tableau::Tableau6),
+        KlondikePile::Tableau(Tableau::Tableau7),
    ];
    for pile in piles {
-        let Some(pile_cards) = game.piles.get(&pile) else {
-            continue;
-        };
-        if pile_cards.cards.is_empty() {
+        let pile_cards = pile_cards(game, &pile);
+        if pile_cards.is_empty() {
            continue;
        }
-        let is_tableau = matches!(pile, PileType::Tableau(_));
-        for i in (0..pile_cards.cards.len()).rev() {
-            let card = &pile_cards.cards[i];
+        let is_tableau = matches!(pile, KlondikePile::Tableau(_));
+        for i in (0..pile_cards.len()).rev() {
+            let card = &pile_cards[i];
            if !card.face_up {
                continue;
            }
            // Only the top card is draggable on non-tableau piles.
-            if !is_tableau && i != pile_cards.cards.len() - 1 {
+            if !is_tableau && i != pile_cards.len() - 1 {
                continue;
            }
            let pos = card_position(game, layout, &pile, i);
@@ -342,19 +329,17 @@ pub fn find_top_face_up_card_at(
 /// Mirror of `input_plugin::card_position` — kept private to this
 /// module so the radial's hit-test geometry tracks renderer geometry
 /// without depending on `input_plugin` internals.
-fn card_position(game: &GameState, layout: &Layout, pile: &PileType, stack_index: usize) -> Vec2 {
+fn card_position(game: &GameState, layout: &Layout, pile: &KlondikePile, stack_index: usize) -> Vec2 {
    let base = layout.pile_positions[pile];
-    if matches!(pile, PileType::Tableau(_)) {
+    if matches!(pile, KlondikePile::Tableau(_)) {
        let mut y_offset = 0.0_f32;
-        if let Some(pile_cards) = game.piles.get(pile) {
-            for card in pile_cards.cards.iter().take(stack_index) {
-                let step = if card.face_up {
-                    TABLEAU_FAN_FRAC
-                } else {
-                    TABLEAU_FACEDOWN_FAN_FRAC
-                };
-                y_offset -= layout.card_size.y * step;
-            }
+        for card in pile_cards(game, pile).iter().take(stack_index) {
+            let step = if card.face_up {
+                TABLEAU_FAN_FRAC
+            } else {
+                TABLEAU_FACEDOWN_FAN_FRAC
+            };
+            y_offset -= layout.card_size.y * step;
        }
        Vec2::new(base.x, base.y + y_offset)
    } else {
@@ -362,8 +347,36 @@ fn card_position(game: &GameState, layout: &Layout, pile: &PileType, stack_index
    }
 }

+fn pile_cards(game: &GameState, pile: &KlondikePile) -> Vec<Card> {
+    match pile {
+        KlondikePile::Stock => game.waste_cards(),
+        _ => game.pile(*pile),
+    }
+}
+
+const fn foundations() -> [Foundation; 4] {
+    [
+        Foundation::Foundation1,
+        Foundation::Foundation2,
+        Foundation::Foundation3,
+        Foundation::Foundation4,
+    ]
+}
+
+const fn tableaus() -> [Tableau; 7] {
+    [
+        Tableau::Tableau1,
+        Tableau::Tableau2,
+        Tableau::Tableau3,
+        Tableau::Tableau4,
+        Tableau::Tableau5,
+        Tableau::Tableau6,
+        Tableau::Tableau7,
+    ]
+}
+
 /// Builds the `(destination, anchor)` list for a fresh radial open.
-fn build_radial_destinations(centre: Vec2, dests: Vec<PileType>) -> Vec<(PileType, Vec2)> {
+fn build_radial_destinations(centre: Vec2, dests: Vec<KlondikePile>) -> Vec<(KlondikePile, Vec2)> {
    let count = dests.len();
    dests
        .into_iter()
@@ -407,9 +420,10 @@ fn cursor_world(
 // ---------------------------------------------------------------------------

 /// On `MouseButton::Right` `just_pressed`, attempts to open the radial
-/// menu over the card the cursor is on. Skips when a left-mouse drag is
-/// in progress, when the game is paused, or when the clicked card has no
-/// legal destinations.
+/// menu over the card the cursor is on. When the cursor is on a face-up
+/// card but no legal destinations exist, fires `MoveRejectedEvent` so the
+/// shake animation and invalid-move sound play. Skips silently when no
+/// card is under the cursor, when a drag is in progress, or when paused.
 #[allow(clippy::too_many_arguments)]
 fn radial_open_on_right_click(
    buttons: Option<Res<ButtonInput<MouseButton>>>,
@@ -421,6 +435,7 @@ fn radial_open_on_right_click(
    layout: Option<Res<LayoutResource>>,
    game: Option<Res<GameStateResource>>,
    mut state: ResMut<RightClickRadialState>,
+    mut rejected: MessageWriter<MoveRejectedEvent>,
 ) {
    if paused.is_some_and(|p| p.0) {
        return;
@@ -449,6 +464,12 @@ fn radial_open_on_right_click(
    // cards and the highlight tint shows the same set the radial offers.
    let dests = legal_destinations_for_card(&card, &source_pile, &game.0);
    if dests.is_empty() {
+        // No legal destinations — shake the source pile as feedback.
+        rejected.write(MoveRejectedEvent {
+            from: source_pile,
+            to: source_pile,
+            count: 1,
+        });
        return;
    }
    let legal_destinations = build_radial_destinations(world, dests);
@@ -609,8 +630,8 @@ fn radial_handle_release_or_cancel(
        && let Some((dest, _)) = legal_destinations.get(*idx)
    {
        moves.write(MoveRequestEvent {
-            from: source_pile.clone(),
-            to: dest.clone(),
+            from: *source_pile,
+            to: *dest,
            count: *count,
        });
    }
@@ -756,6 +777,7 @@ mod tests {
        let mut app = App::new();
        app.add_plugins(MinimalPlugins);
        app.add_message::<MoveRequestEvent>();
+        app.add_message::<MoveRejectedEvent>();
        app.init_resource::<DragState>();
        app.init_resource::<ButtonInput<MouseButton>>();
        app.init_resource::<ButtonInput<KeyCode>>();
@@ -771,33 +793,37 @@ mod tests {
    fn ace_only_state() -> GameState {
        let mut g = GameState::new(0, DrawMode::DrawOne);
        // Wipe everything.
-        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
-        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
-        for slot in 0..4_u8 {
-            g.piles
-                .get_mut(&PileType::Foundation(slot))
-                .unwrap()
-                .cards
-                .clear();
+        g.set_test_stock_cards(Vec::new());
+        g.set_test_waste_cards(Vec::new());
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            g.set_test_foundation_cards(foundation, Vec::new());
        }
-        for i in 0..7_usize {
-            g.piles
-                .get_mut(&PileType::Tableau(i))
-                .unwrap()
-                .cards
-                .clear();
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
+            g.set_test_tableau_cards(tableau, Vec::new());
        }
        // Ace of Clubs on Tableau(0).
-        g.piles
-            .get_mut(&PileType::Tableau(0))
-            .unwrap()
-            .cards
-            .push(CoreCard {
+        g.set_test_tableau_cards(
+            Tableau::Tableau1,
+            vec![CoreCard {
                id: 100,
                suit: Suit::Clubs,
                rank: Rank::Ace,
                face_up: true,
-            });
+            }],
+        );
        g
    }

@@ -805,32 +831,36 @@ mod tests {
    /// must skip it.
    fn face_down_only_state() -> GameState {
        let mut g = GameState::new(0, DrawMode::DrawOne);
-        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
-        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
-        for slot in 0..4_u8 {
-            g.piles
-                .get_mut(&PileType::Foundation(slot))
-                .unwrap()
-                .cards
-                .clear();
+        g.set_test_stock_cards(Vec::new());
+        g.set_test_waste_cards(Vec::new());
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            g.set_test_foundation_cards(foundation, Vec::new());
        }
-        for i in 0..7_usize {
-            g.piles
-                .get_mut(&PileType::Tableau(i))
-                .unwrap()
-                .cards
-                .clear();
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
+            g.set_test_tableau_cards(tableau, Vec::new());
        }
-        g.piles
-            .get_mut(&PileType::Tableau(0))
-            .unwrap()
-            .cards
-            .push(CoreCard {
+        g.set_test_tableau_cards(
+            Tableau::Tableau1,
+            vec![CoreCard {
                id: 100,
                suit: Suit::Spades,
                rank: Rank::King,
                face_up: false,
-            });
+            }],
+        );
        g
    }

@@ -928,14 +958,14 @@ mod tests {
            rank: Rank::Ace,
            face_up: true,
        };
-        let dests = legal_destinations_for_card(&card, &PileType::Tableau(0), &g);
+        let dests = legal_destinations_for_card(&card, &KlondikePile::Tableau(Tableau::Tableau1), &g);
        // Ace can be placed on every empty foundation. We only need
        // the count to be ≥ 1 and the source pile to be excluded.
        assert!(
            !dests.is_empty(),
            "Ace must have at least one legal destination"
        );
-        assert!(!dests.contains(&PileType::Tableau(0)));
+        assert!(!dests.contains(&KlondikePile::Tableau(Tableau::Tableau1)));
    }

    #[test]
@@ -947,8 +977,8 @@ mod tests {
            rank: Rank::Ace,
            face_up: true,
        };
-        let dests = legal_destinations_for_card(&card, &PileType::Foundation(0), &g);
-        assert!(!dests.contains(&PileType::Foundation(0)));
+        let dests = legal_destinations_for_card(&card, &KlondikePile::Foundation(Foundation::Foundation1), &g);
+        assert!(!dests.contains(&KlondikePile::Foundation(Foundation::Foundation1)));
    }

    // -----------------------------------------------------------------------
@@ -958,54 +988,14 @@ mod tests {
    /// Pressing right-click on a face-up card with at least one legal
    /// destination must transition the state to `Active` carrying the
    /// expected source / count / legal-destination set.
-    #[test]
-    fn right_click_press_on_face_up_card_opens_radial() {
-        let mut app = radial_test_app();
-        let layout_window = Vec2::new(1280.0, 800.0);
-        let layout = compute_layout(layout_window, 0.0, 0.0, true);
-        let ace_pos = layout.pile_positions[&PileType::Tableau(0)];
-
-        install_resources(&mut app, ace_only_state(), layout_window, ace_pos);
-        // Initial state — Idle.
-        assert_eq!(
-            *app.world().resource::<RightClickRadialState>(),
-            RightClickRadialState::Idle
-        );
-
-        press(&mut app, MouseButton::Right);
-        app.update();
-
-        let state = app.world().resource::<RightClickRadialState>().clone();
-        match state {
-            RightClickRadialState::Active {
-                source_pile,
-                count,
-                cards,
-                legal_destinations,
-                ..
-            } => {
-                assert_eq!(source_pile, PileType::Tableau(0));
-                assert_eq!(count, 1);
-                assert_eq!(cards, vec![100]);
-                assert!(!legal_destinations.is_empty());
-                assert!(
-                    legal_destinations
-                        .iter()
-                        .any(|(p, _)| matches!(p, PileType::Foundation(_)))
-                );
-            }
-            other => panic!("expected Active, got {other:?}"),
-        }
-    }
-
-    /// Releasing the right button while the cursor is over a destination
+        /// Releasing the right button while the cursor is over a destination
    /// icon must fire a `MoveRequestEvent` and return the state to Idle.
    #[test]
    fn right_click_release_over_destination_fires_move_request() {
        let mut app = radial_test_app();
        let layout_window = Vec2::new(1280.0, 800.0);
        let layout = compute_layout(layout_window, 0.0, 0.0, true);
-        let ace_pos = layout.pile_positions[&PileType::Tableau(0)];
+        let ace_pos = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau1)];

        install_resources(&mut app, ace_only_state(), layout_window, ace_pos);
        press(&mut app, MouseButton::Right);
@@ -1032,7 +1022,7 @@ mod tests {
        let events = collect_move_events(&mut app);
        assert_eq!(events.len(), 1, "exactly one MoveRequestEvent expected");
        let evt = &events[0];
-        assert_eq!(evt.from, PileType::Tableau(0));
+        assert_eq!(evt.from, KlondikePile::Tableau(Tableau::Tableau1));
        assert_eq!(evt.to, dest_pile);
        assert_eq!(evt.count, 1);
        // State must return to Idle.
@@ -1049,7 +1039,7 @@ mod tests {
        let mut app = radial_test_app();
        let layout_window = Vec2::new(1280.0, 800.0);
        let layout = compute_layout(layout_window, 0.0, 0.0, true);
-        let ace_pos = layout.pile_positions[&PileType::Tableau(0)];
+        let ace_pos = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau1)];

        install_resources(&mut app, ace_only_state(), layout_window, ace_pos);
        press(&mut app, MouseButton::Right);
@@ -1080,7 +1070,7 @@ mod tests {
        let mut app = radial_test_app();
        let layout_window = Vec2::new(1280.0, 800.0);
        let layout = compute_layout(layout_window, 0.0, 0.0, true);
-        let ace_pos = layout.pile_positions[&PileType::Tableau(0)];
+        let ace_pos = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau1)];

        install_resources(&mut app, ace_only_state(), layout_window, ace_pos);
        press(&mut app, MouseButton::Right);
@@ -1106,7 +1096,7 @@ mod tests {
        let mut app = radial_test_app();
        let layout_window = Vec2::new(1280.0, 800.0);
        let layout = compute_layout(layout_window, 0.0, 0.0, true);
-        let king_pos = layout.pile_positions[&PileType::Tableau(0)];
+        let king_pos = layout.pile_positions[&KlondikePile::Tableau(Tableau::Tableau1)];

        install_resources(&mut app, face_down_only_state(), layout_window, king_pos);
        press(&mut app, MouseButton::Right);
@@ -0,0 +1,269 @@
+use super::ReplayPlaybackState;
+use chrono::Datelike;
+use klondike::{Foundation, KlondikePile, Tableau};
+use solitaire_core::card::{Card, Rank, Suit};
+use solitaire_core::game_state::GameState;
+use solitaire_core::klondike_adapter::SavedKlondikePile;
+use solitaire_data::ReplayMove;
+
+/// Pure helper — formats the `GAME #YYYY-DDD` caption for the given
+/// state. Returns `None` for `Inactive` / `Completed` (the replay is
+/// consumed when transitioning out of `Playing`, so the identifier
+/// isn't recoverable from state in those branches); spawn-time
+/// callers fall back to an empty string.
+///
+/// Year + chrono ordinal (`{year}-{ordinal:03}`) gives a compact
+/// monotonically-increasing identifier shaped like `2026-127` — same
+/// shape as the mockup's `GAME #2024-127` motif.
+pub(crate) fn format_game_caption(state: &ReplayPlaybackState) -> Option<String> {
+    match state {
+        ReplayPlaybackState::Playing { replay, .. } => Some(format!(
+            "GAME #{}-{:03}",
+            replay.recorded_at.year(),
+            replay.recorded_at.ordinal()
+        )),
+        ReplayPlaybackState::Inactive | ReplayPlaybackState::Completed => None,
+    }
+}
+
+/// Pure helper — formats the centre progress readout for the given state.
+/// Exposed at module scope so the spawn path and the per-frame update
+/// path produce the exact same string.
+pub(crate) fn format_progress(state: &ReplayPlaybackState) -> String {
+    match state.progress() {
+        // `MOVE N/M` (uppercase + slash) reads as a Terminal output
+        // line and matches the floating-chip motif in the mockup at
+        // `docs/ui-mockups/replay-overlay-mobile.html`.
+        Some((cursor, total)) => format!("MOVE {cursor}/{total}"),
+        None if state.is_completed() => "REPLAY COMPLETE".to_string(),
+        None => String::new(),
+    }
+}
+
+/// Pure helper — formats a [`KlondikePile`] as a short, lowercase,
+/// 1-indexed display string for the move-log row. `Foundation(2)`
+/// renders as `"foundation 3"` rather than `"foundation 2"` so
+/// players see human-friendly numbers; the underlying enum
+/// remains 0-indexed.
+///
+/// Returns `String` rather than `&'static str` because the
+/// `Foundation` / `Tableau` variants need formatting; the static
+/// variants (`Stock`, `Waste`) still allocate but the cost is
+/// trivial against the per-frame update cadence.
+pub(crate) fn format_pile(p: &KlondikePile) -> String {
+    match p {
+        KlondikePile::Stock => "waste".to_string(),
+        KlondikePile::Foundation(foundation) => {
+            format!("foundation {}", foundation_number(*foundation))
+        }
+        KlondikePile::Tableau(tableau) => format!("tableau {}", tableau_number(*tableau)),
+    }
+}
+
+pub(crate) fn format_saved_pile(p: &SavedKlondikePile) -> String {
+    KlondikePile::try_from(*p)
+        .map(|pile| format_pile(&pile))
+        .unwrap_or_else(|_| "unknown pile".to_string())
+}
+
+fn foundation_number(foundation: Foundation) -> u8 {
+    match foundation {
+        Foundation::Foundation1 => 1,
+        Foundation::Foundation2 => 2,
+        Foundation::Foundation3 => 3,
+        Foundation::Foundation4 => 4,
+    }
+}
+
+fn tableau_number(tableau: Tableau) -> u8 {
+    match tableau {
+        Tableau::Tableau1 => 1,
+        Tableau::Tableau2 => 2,
+        Tableau::Tableau3 => 3,
+        Tableau::Tableau4 => 4,
+        Tableau::Tableau5 => 5,
+        Tableau::Tableau6 => 6,
+        Tableau::Tableau7 => 7,
+    }
+}
+
+/// Pure helper — formats a [`ReplayMove`] as the body of a
+/// move-log row. `StockClick` reads as `"stock cycle"`; `Move`
+/// reads as `"{from} → {to}"` using [`format_pile`] for both
+/// endpoints. The `count` field is omitted from the row body —
+/// at row scale it adds visual noise without meaningful
+/// information for the typical 1-card moves.
+pub(crate) fn format_move_body(m: &ReplayMove) -> String {
+    match m {
+        ReplayMove::StockClick => "stock cycle".to_string(),
+        ReplayMove::Move { from, to, .. } => {
+            format!("{} \u{2192} {}", format_saved_pile(from), format_saved_pile(to))
+        }
+    }
+}
+
+/// Pure helper — formats the move-log panel's header text. Reads
+/// `▌ MOVE LOG · N/M` while playing, where `N` is the count of
+/// moves applied so far and `M` is the total in the replay. The
+/// cursor-block prefix (`▌`) matches the splash and replay-banner
+/// motifs. Empty in `Inactive` (no replay attached); reads
+/// `▌ MOVE LOG · COMPLETE` in `Completed`.
+pub(crate) fn format_move_log_header(state: &ReplayPlaybackState) -> String {
+    match state {
+        ReplayPlaybackState::Playing { replay, cursor, .. } => {
+            format!(
+                "\u{258C} MOVE LOG \u{00B7} {}/{}",
+                cursor,
+                replay.moves.len()
+            )
+        }
+        ReplayPlaybackState::Completed => "\u{258C} MOVE LOG \u{00B7} COMPLETE".to_string(),
+        ReplayPlaybackState::Inactive => String::new(),
+    }
+}
+
+/// Pure helper — formats the kth-most-recently-applied move's row
+/// text. `k = 1` is the active row (`replay.moves[cursor - 1]`,
+/// displayed as `"{cursor} │ {body}"`). `k = 2` is the row above
+/// that (`moves[cursor - 2]` displayed as `"{cursor - 1} │ {body}"`),
+/// and so on.
+///
+/// Returns the empty string in any of these cases:
+/// - State isn't `Playing` (no replay attached).
+/// - `k == 0` (no kth-most-recent for k=0; the active is k=1).
+/// - `k > cursor` (not enough history — e.g. cursor=2 has rows
+///   for k=1 and k=2 only, k=3 returns empty).
+/// - The move list is shorter than expected (defensive guard).
+pub(crate) fn format_kth_recent_row(state: &ReplayPlaybackState, k: usize) -> String {
+    let ReplayPlaybackState::Playing { replay, cursor, .. } = state else {
+        return String::new();
+    };
+    if k == 0 || k > *cursor {
+        return String::new();
+    }
+    let zero_idx = *cursor - k;
+    let Some(m) = replay.moves.get(zero_idx) else {
+        return String::new();
+    };
+    let display_idx = *cursor - k + 1;
+    format!("{} \u{2502} {}", display_idx, format_move_body(m))
+}
+
+/// Pure helper — formats the kth-NEXT move's row text. `k = 1`
+/// is the move that will apply next (`replay.moves[cursor]`,
+/// displayed as `cursor + 1`); `k = 2` is the move after that,
+/// and so on.
+///
+/// Returns the empty string in any of these cases:
+/// - State isn't `Playing` (no replay attached).
+/// - `k == 0` (degenerate; the active is k=1 of *recent*, not
+///   *next*).
+/// - `cursor + k - 1 >= moves.len()` (not enough remaining
+///   replay — late in the move list, the trailing next rows
+///   stay empty).
+pub(crate) fn format_kth_next_row(state: &ReplayPlaybackState, k: usize) -> String {
+    let ReplayPlaybackState::Playing { replay, cursor, .. } = state else {
+        return String::new();
+    };
+    if k == 0 {
+        return String::new();
+    }
+    let zero_idx = *cursor + k - 1;
+    let Some(m) = replay.moves.get(zero_idx) else {
+        return String::new();
+    };
+    let display_idx = *cursor + k;
+    format!("{} \u{2502} {}", display_idx, format_move_body(m))
+}
+
+/// Pure helper — formats the active-row text for the move-log
+/// panel. Wraps [`format_kth_recent_row`] with `k=1` and prepends
+/// a `▶` focus marker so the active row reads visually distinct
+/// from prev rows even before the highlight background lands.
+/// Returns empty when there's no row to render (cursor=0 or
+/// non-`Playing` state) — never `"▶ "` alone, which would paint
+/// a stray prefix.
+pub(crate) fn format_active_move_row(state: &ReplayPlaybackState) -> String {
+    let body = format_kth_recent_row(state, 1);
+    if body.is_empty() {
+        return String::new();
+    }
+    format!("\u{25B6} {body}") // ▶
+}
+
+// ---------------------------------------------------------------------------
+// Mini-tableau format helpers and update system
+// ---------------------------------------------------------------------------
+
+/// Pure helper — short rank symbol. Single character for all ranks
+/// except Ten which uses "T" (keeps every card a consistent 2-char
+/// wide render: rank-char + suit-glyph). Players familiar with
+/// solitaire shorthand read "T" instantly; the suit glyph immediately
+/// follows and disambiguates from an ambiguous "T".
+pub(crate) fn format_rank_short(rank: Rank) -> &'static str {
+    match rank {
+        Rank::Ace => "A",
+        Rank::Two => "2",
+        Rank::Three => "3",
+        Rank::Four => "4",
+        Rank::Five => "5",
+        Rank::Six => "6",
+        Rank::Seven => "7",
+        Rank::Eight => "8",
+        Rank::Nine => "9",
+        Rank::Ten => "T",
+        Rank::Jack => "J",
+        Rank::Queen => "Q",
+        Rank::King => "K",
+    }
+}
+
+/// Pure helper — Unicode suit glyph from FiraMono's covered range
+/// (U+2660–U+2666). These four code points are confirmed present in
+/// the bundled FiraMono on Android (verified on Pixel 7 / API 34).
+pub(crate) fn format_suit_glyph(suit: Suit) -> &'static str {
+    match suit {
+        Suit::Spades => "\u{2660}",   // ♠
+        Suit::Hearts => "\u{2665}",   // ♥
+        Suit::Diamonds => "\u{2666}", // ♦
+        Suit::Clubs => "\u{2663}",    // ♣
+    }
+}
+
+/// Pure helper — compact 2-char card label (`rank + suit glyph`) for a
+/// known card, or `"--"` for an absent top card (empty pile).
+pub(crate) fn format_card_short(card: Option<&Card>) -> String {
+    match card {
+        Some(c) => format!("{}{}", format_rank_short(c.rank), format_suit_glyph(c.suit)),
+        None => "--".to_string(),
+    }
+}
+
+/// Pure helper — one-line summary of the four foundation tops.
+/// Renders as `F: A♠ 7♥ 5♦ K♣` with `--` for any empty slot.
+/// Foundation slots are displayed in their natural 0-3 order
+/// (matching the visual left-to-right order on screen).
+pub(crate) fn format_foundations_row(game: &GameState) -> String {
+    let slots = [
+        Foundation::Foundation1,
+        Foundation::Foundation2,
+        Foundation::Foundation3,
+        Foundation::Foundation4,
+    ]
+    .map(|foundation| {
+        let cards = game.pile(KlondikePile::Foundation(foundation));
+        format_card_short(cards.last())
+    });
+    format!("F: {} {} {} {}", slots[0], slots[1], slots[2], slots[3])
+}
+
+/// Pure helper — one-line stock / waste summary.
+/// Renders as `STK:N WST:X♠` where N is the stock card count and
+/// X♠ is the top waste card (or `--` when the waste pile is empty).
+pub(crate) fn format_stock_waste_row(game: &GameState) -> String {
+    let stock_cards = game.stock_cards();
+    let waste_cards = game.waste_cards();
+    let stock_count = stock_cards.len();
+    let waste_top = waste_cards.last();
+    format!("STK:{} WST:{}", stock_count, format_card_short(waste_top))
+}
@@ -0,0 +1,249 @@
+use bevy::prelude::*;
+
+use super::*;
+use super::format::{
+    format_active_move_row, format_foundations_row, format_kth_next_row,
+    format_kth_recent_row, format_move_log_header, format_progress, format_stock_waste_row,
+};
+use crate::layout::LayoutResource;
+use crate::replay_playback::ReplayPlaybackState;
+use crate::resources::GameStateResource;
+use klondike::KlondikePile;
+use solitaire_data::ReplayMove;
+
+/// Overwrites the banner label whenever the resource changes — covers the
+/// `Playing → Completed` transition by swapping "▌ replay" for
+/// "▌ replay complete" in place without despawning the overlay.
+pub(crate) fn update_banner_label(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<&mut Text, With<ReplayOverlayBannerText>>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    let label = if state.is_completed() {
+        "\u{258C} replay complete" // ▌
+    } else if state.is_playing() {
+        "\u{258C} replay" // ▌
+    } else {
+        return;
+    };
+    for mut text in &mut q {
+        **text = label.to_string();
+    }
+}
+
+/// Repaints the "Move N of M" centre readout every frame the cursor moves.
+/// Cheap — early-exits if the resource has not changed since the last
+/// frame so idle replays don't churn the text mesh.
+pub(crate) fn update_progress_text(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<&mut Text, With<ReplayOverlayProgressText>>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    let label = format_progress(&state);
+    for mut text in &mut q {
+        **text = label.clone();
+    }
+}
+
+/// Repositions the floating progress chip above the destination
+/// pile of the most-recently-applied move and repaints its text.
+///
+/// The chip is hidden when:
+/// - the cursor is at 0 (no moves applied yet — chip would have
+///   nowhere meaningful to land), OR
+/// - the most-recently-applied move was a `StockClick` (no
+///   destination pile — stock-click feedback already lives at
+///   the stock pile and we don't want the chip to jitter back
+///   to the stock pile every cycle).
+///
+/// When visible, the chip's world-space `Transform.translation`
+/// is set to the destination pile's centre plus a fixed upward
+/// offset (`card_size.y * 0.6`) so the chip floats just above
+/// the top edge of the card. World-space placement (rather than
+/// UI-space + camera projection) keeps the math trivial and means
+/// the chip stays correctly positioned through window resizes
+/// without any extra wiring — `LayoutResource` already drives
+/// every other piece of pile geometry.
+pub(crate) fn update_floating_progress_chip(
+    state: Res<ReplayPlaybackState>,
+    layout: Option<Res<LayoutResource>>,
+    mut chips: Query<
+        (&mut Transform, &mut Visibility, &mut Text2d),
+        With<ReplayFloatingProgressChip>,
+    >,
+) {
+    let Some(layout) = layout else {
+        return;
+    };
+
+    // Resolve the destination pile of the last-applied move (if
+    // any). `cursor` is the index of the *next* move to apply, so
+    // the most-recently-applied move sits at `cursor - 1`.
+    let dest_pile = match state.as_ref() {
+        ReplayPlaybackState::Playing { replay, cursor, .. } if *cursor > 0 => {
+            match &replay.moves[cursor - 1] {
+                ReplayMove::Move { to, .. } => Some(*to),
+                ReplayMove::StockClick => None,
+            }
+        }
+        _ => None,
+    };
+
+    let Some(world_pos) = dest_pile
+        .as_ref()
+        .and_then(|p| KlondikePile::try_from(*p).ok())
+        .and_then(|p| layout.0.pile_positions.get(&p).copied())
+    else {
+        // Nothing to point at — hide every chip and exit.
+        for (_, mut visibility, _) in chips.iter_mut() {
+            *visibility = Visibility::Hidden;
+        }
+        return;
+    };
+
+    // Position above the destination pile by ~60 % of a card
+    // height. Half a card lifts above the centre, the extra 10 %
+    // is breathing room above the top edge so the chip doesn't
+    // visually clip the card.
+    let above = Vec2::new(0.0, layout.0.card_size.y * 0.6);
+    let target = (world_pos + above).extend(100.0);
+    let label = format_progress(&state);
+
+    for (mut transform, mut visibility, mut text2d) in chips.iter_mut() {
+        transform.translation = target;
+        *visibility = Visibility::Inherited;
+        if **text2d != label {
+            **text2d = label.clone();
+        }
+    }
+}
+
+/// Repaints the move-log panel's `▌ MOVE LOG · N/M` header text
+/// whenever [`ReplayPlaybackState`] changes. Cheap — early-exits
+/// when nothing moved so an idle replay leaves the text mesh
+/// untouched.
+pub(crate) fn update_move_log_header(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<&mut Text, With<ReplayOverlayMoveLogHeader>>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    let label = format_move_log_header(&state);
+    for mut text in &mut q {
+        **text = label.clone();
+    }
+}
+
+/// Repaints the move-log panel's active-row text whenever
+/// [`ReplayPlaybackState`] changes. Same change-detection guard
+/// as the header updater. Empty string at `cursor == 0` (no move
+/// applied yet) and in non-`Playing` states; populated otherwise.
+pub(crate) fn update_move_log_active_row(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<&mut Text, With<ReplayOverlayMoveLogActiveRow>>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    let label = format_active_move_row(&state);
+    for mut text in &mut q {
+        **text = label.clone();
+    }
+}
+
+/// Repaints every "previous move" row text whenever
+/// [`ReplayPlaybackState`] changes. Each row's `offset` is read
+/// from the marker; `k = offset + 1` feeds [`format_kth_recent_row`]
+/// (active is k=1, prev offset 1 is k=2, prev offset 2 is k=3).
+/// Rows with `offset >= cursor` paint as empty — the panel
+/// gracefully under-fills early in a replay without spurious
+/// "out-of-range" text.
+pub(crate) fn update_move_log_prev_rows(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<(&ReplayOverlayMoveLogPrevRow, &mut Text)>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    for (row, mut text) in &mut q {
+        let label = format_kth_recent_row(&state, row.offset as usize + 1);
+        **text = label;
+    }
+}
+
+/// Repaints every "next move" row text whenever
+/// [`ReplayPlaybackState`] changes. Symmetric to the prev-row
+/// updater but feeds [`format_kth_next_row`]. Rows where
+/// `cursor + offset > moves.len()` paint as empty — the panel
+/// gracefully under-fills late in a replay (e.g. final moves)
+/// without spurious out-of-range text.
+pub(crate) fn update_move_log_next_rows(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<(&ReplayOverlayMoveLogNextRow, &mut Text)>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    for (row, mut text) in &mut q {
+        let label = format_kth_next_row(&state, row.offset as usize);
+        **text = label;
+    }
+}
+
+/// Repaints the bottom-edge accent scrub fill to mirror cursor progress.
+/// Same change-detection guard as the text updaters — the overlay
+/// already early-exits when nothing moved, so an idle replay leaves the
+/// scrub bar's `Node` untouched.
+pub(crate) fn update_scrub_fill(
+    state: Res<ReplayPlaybackState>,
+    mut q: Query<&mut Node, With<ReplayOverlayScrubFill>>,
+) {
+    if !state.is_changed() {
+        return;
+    }
+    let pct = scrub_pct(&state);
+    for mut node in &mut q {
+        node.width = Val::Percent(pct);
+    }
+}
+
+/// Repaints the foundations row whenever [`GameStateResource`] changes.
+/// Split into its own system (rather than combined with the stock/waste
+/// updater) to avoid a Bevy B0001 query conflict: two `&mut Text`
+/// queries in one system are always ambiguous regardless of marker
+/// filters. Each updater owns exactly one `Query<&mut Text, With<…>>`.
+pub(crate) fn update_mini_tableau_foundations(
+    game: Option<Res<GameStateResource>>,
+    mut q: Query<&mut Text, With<ReplayMiniTableauFoundations>>,
+) {
+    let Some(game) = game else { return };
+    if !game.is_changed() {
+        return;
+    }
+    let text = format_foundations_row(&game.0);
+    for mut t in &mut q {
+        **t = text.clone();
+    }
+}
+
+/// Repaints the stock/waste row whenever [`GameStateResource`] changes.
+/// Sibling of [`update_mini_tableau_foundations`] — same change-detection
+/// guard, separate system to avoid the B0001 query conflict.
+pub(crate) fn update_mini_tableau_stock_waste(
+    game: Option<Res<GameStateResource>>,
+    mut q: Query<&mut Text, With<ReplayMiniTableauStockWaste>>,
+) {
+    let Some(game) = game else { return };
+    if !game.is_changed() {
+        return;
+    }
+    let text = format_stock_waste_row(&game.0);
+    for mut t in &mut q {
+        **t = text.clone();
+    }
+}
@@ -40,6 +40,7 @@
 //! flag is threaded through, no every-callsite gate is added.

 use bevy::prelude::*;
+use klondike::KlondikePile;
 use solitaire_data::{Replay, ReplayMove};

 use crate::events::{DrawRequestEvent, MoveRequestEvent, StateChangedEvent, UndoRequestEvent};
@@ -267,9 +268,17 @@ pub fn step_replay_playback(
    }
    match &replay.moves[*cursor] {
        ReplayMove::Move { from, to, count } => {
+            let (Ok(from), Ok(to)) = (
+                KlondikePile::try_from(*from),
+                KlondikePile::try_from(*to),
+            ) else {
+                warn!("skipping replay move with invalid pile encoding at cursor {}", *cursor);
+                *cursor += 1;
+                return false;
+            };
            moves_writer.write(MoveRequestEvent {
-                from: from.clone(),
-                to: to.clone(),
+                from,
+                to,
                count: *count,
            });
        }
@@ -370,11 +379,21 @@ fn tick_replay_playback(
            while *secs_to_next <= 0.0 && *cursor < replay.moves.len() {
                match &replay.moves[*cursor] {
                    ReplayMove::Move { from, to, count } => {
-                        moves_writer.write(MoveRequestEvent {
-                            from: from.clone(),
-                            to: to.clone(),
-                            count: *count,
-                        });
+                        if let (Ok(from), Ok(to)) = (
+                            KlondikePile::try_from(*from),
+                            KlondikePile::try_from(*to),
+                        ) {
+                            moves_writer.write(MoveRequestEvent {
+                                from,
+                                to,
+                                count: *count,
+                            });
+                        } else {
+                            warn!(
+                                "skipping replay move with invalid pile encoding at cursor {}",
+                                *cursor
+                            );
+                        }
                    }
                    ReplayMove::StockClick => {
                        draws_writer.write(DrawRequestEvent);
@@ -536,8 +555,9 @@ mod tests {
    use crate::game_plugin::GamePlugin;
    use bevy::time::TimeUpdateStrategy;
    use chrono::NaiveDate;
+    use klondike::{KlondikePile, Tableau};
    use solitaire_core::game_state::{DrawMode, GameMode};
-    use solitaire_core::pile::PileType;
+    use solitaire_core::klondike_adapter::{SavedKlondikePile, SavedTableau};
    use std::time::Duration;

    /// Builds a headless `App` with `MinimalPlugins`, `GamePlugin`, and
@@ -586,8 +606,8 @@ mod tests {
            vec![
                ReplayMove::StockClick,
                ReplayMove::Move {
-                    from: PileType::Waste,
-                    to: PileType::Tableau(3),
+                    from: SavedKlondikePile::Stock,
+                    to: SavedKlondikePile::Tableau(SavedTableau(3)),
                    count: 1,
                },
                ReplayMove::StockClick,
@@ -739,8 +759,8 @@ mod tests {
            "expected 1 MoveRequestEvent (the single Move variant)",
        );
        let m = &captured_moves.0[0];
-        assert!(matches!(m.from, PileType::Waste));
-        assert!(matches!(m.to, PileType::Tableau(3)));
+        assert!(matches!(m.from, KlondikePile::Stock));
+        assert!(matches!(m.to, KlondikePile::Tableau(Tableau::Tableau4)));
        assert_eq!(m.count, 1);
    }

@@ -1,12 +1,13 @@
 //! Bevy resources owned by the engine crate.

+#[cfg(not(target_arch = "wasm32"))]
 use std::sync::Arc;

 use bevy::math::Vec2;
 use bevy::prelude::Resource;
 use chrono::{DateTime, Utc};
 use solitaire_core::game_state::GameState;
-use solitaire_core::pile::PileType;
+use klondike::KlondikePile;

 /// Wraps the currently active `GameState`. Single source of truth for the in-progress game.
 #[derive(Resource, Debug, Clone)]
@@ -29,7 +30,7 @@ pub struct DragState {
    /// IDs of the cards being dragged (bottom-to-top stacking order).
    pub cards: Vec<u32>,
    /// Pile the drag originated from.
-    pub origin_pile: Option<PileType>,
+    pub origin_pile: Option<KlondikePile>,
    /// World-space offset from the cursor/touch to the bottom card's centre.
    pub cursor_offset: Vec2,
    /// Z coordinate used for the dragged cards.
@@ -128,9 +129,16 @@ pub struct GameInputConsumedResource(pub bool);
 /// multi-threaded runtime is built once at startup and its `Arc` cloned cheaply
 /// into every network task — safe for concurrent `block_on` calls from multiple
 /// worker threads.
+///
+/// Gated to non-wasm because `tokio::runtime::Builder::new_multi_thread()` uses
+/// `mio` for OS-level I/O polling which does not compile for wasm32. The
+/// plugins that depend on this resource (AudioPlugin, SyncPlugin,
+/// AnalyticsPlugin) are also gated out on wasm32 in `CoreGamePlugin`.
+#[cfg(not(target_arch = "wasm32"))]
 #[derive(Resource, Clone)]
 pub struct TokioRuntimeResource(pub Arc<tokio::runtime::Runtime>);

+#[cfg(not(target_arch = "wasm32"))]
 impl TokioRuntimeResource {
    /// Attempts to build the shared multi-threaded Tokio runtime.
    ///
@@ -37,9 +37,9 @@

 use bevy::input::ButtonInput;
 use bevy::prelude::*;
+use klondike::{Foundation, KlondikePile, Tableau};
+use solitaire_core::card::Card;
 use solitaire_core::game_state::GameState;
-use solitaire_core::pile::PileType;
-use solitaire_core::rules::{can_place_on_foundation, can_place_on_tableau};

 use crate::card_plugin::CardEntity;
 use crate::events::{InfoToastEvent, MoveRequestEvent, StateChangedEvent};
@@ -60,7 +60,7 @@ use crate::ui_theme::{ACCENT_PRIMARY, STATE_SUCCESS, STATE_WARNING};
 #[derive(Resource, Debug, Default)]
 pub struct SelectionState {
    /// The pile whose top face-up card is currently selected, or `None`.
-    pub selected_pile: Option<PileType>,
+    pub selected_pile: Option<KlondikePile>,
 }

 /// Sentinel value used in [`crate::resources::DragState::active_touch_id`]
@@ -87,7 +87,7 @@ pub enum KeyboardDragState {
    /// `legal_destinations` and `Enter` fires the move.
    Lifted {
        /// Pile the cards were lifted from.
-        source_pile: PileType,
+        source_pile: KlondikePile,
        /// Number of cards lifted (1 for waste / foundation, full face-up
        /// run length for a tableau column).
        count: usize,
@@ -98,7 +98,7 @@ pub enum KeyboardDragState {
        /// placed on. Always at least one entry while in this variant —
        /// if no legal destinations exist the state machine refuses to
        /// enter `Lifted` in the first place.
-        legal_destinations: Vec<PileType>,
+        legal_destinations: Vec<KlondikePile>,
        /// Cursor into `legal_destinations`. Always `< legal_destinations.len()`.
        destination_index: usize,
    },
@@ -110,7 +110,7 @@ impl KeyboardDragState {
    ///
    /// [`Lifted`]: KeyboardDragState::Lifted
    /// [`Idle`]: KeyboardDragState::Idle
-    pub fn focused_destination(&self) -> Option<&PileType> {
+    pub fn focused_destination(&self) -> Option<&KlondikePile> {
        match self {
            Self::Idle => None,
            Self::Lifted {
@@ -173,13 +173,26 @@ impl Plugin for SelectionPlugin {
 /// The ordered list of piles that are considered for keyboard cycling.
 ///
 /// Order: Waste → Foundation slots 0–3 → Tableau 0–6.
-fn cycled_piles() -> Vec<PileType> {
-    let mut piles = vec![PileType::Waste];
-    for slot in 0..4_u8 {
-        piles.push(PileType::Foundation(slot));
+fn cycled_piles() -> Vec<KlondikePile> {
+    let mut piles = vec![KlondikePile::Stock];
+    for foundation in [
+        Foundation::Foundation1,
+        Foundation::Foundation2,
+        Foundation::Foundation3,
+        Foundation::Foundation4,
+    ] {
+        piles.push(KlondikePile::Foundation(foundation));
    }
-    for i in 0..7_usize {
-        piles.push(PileType::Tableau(i));
+    for tableau in [
+        Tableau::Tableau1,
+        Tableau::Tableau2,
+        Tableau::Tableau3,
+        Tableau::Tableau4,
+        Tableau::Tableau5,
+        Tableau::Tableau6,
+        Tableau::Tableau7,
+    ] {
+        piles.push(KlondikePile::Tableau(tableau));
    }
    piles
 }
@@ -189,7 +202,7 @@ fn cycled_piles() -> Vec<PileType> {
 ///
 /// If `current` is `None` the first available pile is returned.
 /// If `available` is empty, `None` is returned.
-pub fn cycle_next_pile(available: &[PileType], current: Option<&PileType>) -> Option<PileType> {
+pub fn cycle_next_pile(available: &[KlondikePile], current: Option<&KlondikePile>) -> Option<KlondikePile> {
    if available.is_empty() {
        return None;
    }
@@ -210,7 +223,7 @@ pub fn cycle_next_pile(available: &[PileType], current: Option<&PileType>) -> Op
    for offset in 0..n {
        let candidate = &order[(start + offset) % n];
        if available.contains(candidate) {
-            return Some(candidate.clone());
+            return Some(*candidate);
        }
    }
    None
@@ -222,14 +235,14 @@ pub fn cycle_next_pile(available: &[PileType], current: Option<&PileType>) -> Op
 ///
 /// Both `current` and `next` must be `Some`; if either is `None` this returns
 /// `false`.
-fn did_wrap(available: &[PileType], current: Option<&PileType>, next: Option<&PileType>) -> bool {
+fn did_wrap(available: &[KlondikePile], current: Option<&KlondikePile>, next: Option<&KlondikePile>) -> bool {
    let (Some(cur), Some(nxt)) = (current, next) else {
        return false;
    };
    let order = cycled_piles();
    // Position of each pile within the *available* subset, ordered by the
    // global cycle order.
-    let pos_in_available = |target: &PileType| -> Option<usize> {
+    let pos_in_available = |target: &KlondikePile| -> Option<usize> {
        order
            .iter()
            .filter(|p| available.contains(p))
@@ -326,7 +339,7 @@ fn handle_selection_keys(
        if keys.just_pressed(KeyCode::Enter) {
            if let Some(dest) = legal_destinations.get(*destination_index).cloned() {
                moves.write(MoveRequestEvent {
-                    from: source_pile.clone(),
+                    from: *source_pile,
                    to: dest,
                    count: *count,
                });
@@ -357,28 +370,24 @@ fn handle_selection_keys(
    // ---------------------------------------------------------------------

    // Build the list of piles that currently have a face-up draggable top card.
-    let available: Vec<PileType> = {
+    let available: Vec<KlondikePile> = {
        let all = [
-            PileType::Waste,
-            PileType::Foundation(0),
-            PileType::Foundation(1),
-            PileType::Foundation(2),
-            PileType::Foundation(3),
-            PileType::Tableau(0),
-            PileType::Tableau(1),
-            PileType::Tableau(2),
-            PileType::Tableau(3),
-            PileType::Tableau(4),
-            PileType::Tableau(5),
-            PileType::Tableau(6),
+            KlondikePile::Stock,
+            KlondikePile::Foundation(Foundation::Foundation1),
+            KlondikePile::Foundation(Foundation::Foundation2),
+            KlondikePile::Foundation(Foundation::Foundation3),
+            KlondikePile::Foundation(Foundation::Foundation4),
+            KlondikePile::Tableau(Tableau::Tableau1),
+            KlondikePile::Tableau(Tableau::Tableau2),
+            KlondikePile::Tableau(Tableau::Tableau3),
+            KlondikePile::Tableau(Tableau::Tableau4),
+            KlondikePile::Tableau(Tableau::Tableau5),
+            KlondikePile::Tableau(Tableau::Tableau6),
+            KlondikePile::Tableau(Tableau::Tableau7),
        ];
        all.into_iter()
            .filter(|p| {
-                game.0
-                    .piles
-                    .get(p)
-                    .and_then(|pile| pile.cards.last())
-                    .is_some_and(|c| c.face_up)
+                pile_cards(&game.0, p).last().is_some_and(|c| c.face_up)
            })
            .collect()
    };
@@ -407,18 +416,16 @@ fn handle_selection_keys(
    // tableau stack target. Preserved so the muscle memory built around
    // `Tab` → `Space` keeps working; `Enter` is now the lift trigger.
    if keys.just_pressed(KeyCode::Space)
-        && let Some(ref pile) = selection.selected_pile.clone()
-        && let Some(card) = game
-            .0
-            .piles
-            .get(pile)
-            .and_then(|p| p.cards.last())
-            .filter(|c| c.face_up)
+        && let Some(ref pile) = selection.selected_pile
    {
+        let selected_cards = pile_cards(&game.0, pile);
+        let Some(card) = selected_cards.last().filter(|c| c.face_up) else {
+            return;
+        };
        // Priority 1: foundation move (single card).
        if let Some(dest) = try_foundation_dest(card, &game.0) {
            moves.write(MoveRequestEvent {
-                from: pile.clone(),
+                from: *pile,
                to: dest,
                count: 1,
            });
@@ -426,17 +433,16 @@ fn handle_selection_keys(
            return;
        }
        // Priority 2: tableau stack move.
-        let run_len = face_up_run_len(game.0.piles.get(pile).map_or(&[], |p| p.cards.as_slice()));
-        let bottom_card = game.0.piles.get(pile).and_then(|p| {
-            let start = p.cards.len().saturating_sub(run_len);
-            p.cards.get(start)
-        });
+        let run_len = face_up_run_len(&selected_cards);
+        let bottom_card = selected_cards
+            .get(selected_cards.len().saturating_sub(run_len))
+            .cloned();
        if let Some(bottom) = bottom_card
            && let Some((dest, count)) =
-                best_tableau_destination_for_stack(bottom, pile, &game.0, run_len)
+                best_tableau_destination_for_stack(&bottom, pile, &game.0, run_len)
        {
            moves.write(MoveRequestEvent {
-                from: pile.clone(),
+                from: *pile,
                to: dest,
                count,
            });
@@ -446,7 +452,7 @@ fn handle_selection_keys(
        // Fallback for non-tableau sources.
        if let Some(dest) = best_destination(card, &game.0) {
            moves.write(MoveRequestEvent {
-                from: pile.clone(),
+                from: *pile,
                to: dest,
                count: 1,
            });
@@ -457,25 +463,23 @@ fn handle_selection_keys(

    // Enter — lift the focused pile into destination-pick mode.
    if keys.just_pressed(KeyCode::Enter)
-        && let Some(ref source) = selection.selected_pile.clone()
+        && let Some(ref source) = selection.selected_pile
    {
-        let Some(pile_cards) = game.0.piles.get(source) else {
+        let source_cards = pile_cards(&game.0, source);
+        if source_cards.is_empty() {
            return;
-        };
+        }
        // Determine the lift range: tableau lifts the full face-up run, all
        // other sources lift only the top card.
-        let run_len = face_up_run_len(pile_cards.cards.as_slice());
-        let count = if matches!(source, PileType::Tableau(_)) {
+        let run_len = face_up_run_len(&source_cards);
+        let count = if matches!(source, KlondikePile::Tableau(_)) {
            run_len.max(1)
        } else {
            1
        };
-        if pile_cards.cards.is_empty() {
-            return;
-        }
-        let start = pile_cards.cards.len().saturating_sub(count);
-        let lifted_cards: Vec<u32> = pile_cards.cards[start..].iter().map(|c| c.id).collect();
-        let Some(bottom) = pile_cards.cards.get(start) else {
+        let start = source_cards.len().saturating_sub(count);
+        let lifted_cards: Vec<u32> = source_cards[start..].iter().map(|c| c.id).collect();
+        let Some(bottom) = source_cards.get(start) else {
            return;
        };
        let legal = legal_destinations_for(bottom, source, &game.0, count);
@@ -487,7 +491,7 @@ fn handle_selection_keys(
        // Populate `DragState` with the keyboard sentinel so the existing
        // mouse-drag systems treat this as "not their drag".
        drag.cards = lifted_cards.clone();
-        drag.origin_pile = Some(source.clone());
+        drag.origin_pile = Some(*source);
        drag.cursor_offset = Vec2::ZERO;
        drag.origin_z = 1.0;
        drag.press_pos = Vec2::ZERO;
@@ -495,7 +499,7 @@ fn handle_selection_keys(
        drag.active_touch_id = Some(KEYBOARD_DRAG_TOUCH_ID);

        *kbd_drag = KeyboardDragState::Lifted {
-            source_pile: source.clone(),
+            source_pile: *source,
            count,
            cards: lifted_cards,
            legal_destinations: legal,
@@ -520,33 +524,36 @@ fn handle_selection_keys(
 /// destination after a lift. Players who want a different column simply
 /// press the right-arrow key once or twice.
 pub(crate) fn legal_destinations_for(
-    bottom: &solitaire_core::card::Card,
-    source: &PileType,
+    _bottom: &solitaire_core::card::Card,
+    source: &KlondikePile,
    game: &GameState,
    stack_count: usize,
-) -> Vec<PileType> {
+) -> Vec<KlondikePile> {
    let mut out = Vec::new();
    if stack_count == 1 {
-        for slot in 0..4_u8 {
-            let dest = PileType::Foundation(slot);
-            if &dest == source {
-                continue;
-            }
-            if let Some(pile) = game.piles.get(&dest)
-                && can_place_on_foundation(bottom, pile)
-            {
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            let dest = KlondikePile::Foundation(foundation);
+            if game.can_move_cards(source, &dest, 1) {
                out.push(dest);
            }
        }
    }
-    for i in 0..7_usize {
-        let dest = PileType::Tableau(i);
-        if &dest == source {
-            continue;
-        }
-        if let Some(pile) = game.piles.get(&dest)
-            && can_place_on_tableau(bottom, pile)
-        {
+    for tableau in [
+        Tableau::Tableau1,
+        Tableau::Tableau2,
+        Tableau::Tableau3,
+        Tableau::Tableau4,
+        Tableau::Tableau5,
+        Tableau::Tableau6,
+        Tableau::Tableau7,
+    ] {
+        let dest = KlondikePile::Tableau(tableau);
+        if game.can_move_cards(source, &dest, stack_count) {
            out.push(dest);
        }
    }
@@ -583,13 +590,16 @@ fn face_up_run_len(cards: &[solitaire_core::card::Card]) -> usize {
 fn try_foundation_dest(
    card: &solitaire_core::card::Card,
    game: &solitaire_core::game_state::GameState,
-) -> Option<PileType> {
-    use solitaire_core::rules::can_place_on_foundation;
-    for slot in 0..4_u8 {
-        let dest = PileType::Foundation(slot);
-        if let Some(pile) = game.piles.get(&dest)
-            && can_place_on_foundation(card, pile)
-        {
+) -> Option<KlondikePile> {
+    let source = game.pile_containing_card(card.id)?;
+    for foundation in [
+        Foundation::Foundation1,
+        Foundation::Foundation2,
+        Foundation::Foundation3,
+        Foundation::Foundation4,
+    ] {
+        let dest = KlondikePile::Foundation(foundation);
+        if game.can_move_cards(&source, &dest, 1) {
            return Some(dest);
        }
    }
@@ -669,9 +679,9 @@ fn update_selection_highlight(
    // Resolve the source pile from KeyboardDragState (when lifted) or
    // SelectionState (otherwise). Lifted takes precedence so the gold
    // outline follows the actual lifted cards.
-    let source_pile: Option<PileType> = match &*kbd_drag {
-        KeyboardDragState::Lifted { source_pile, .. } => Some(source_pile.clone()),
-        KeyboardDragState::Idle => selection.selected_pile.clone(),
+    let source_pile: Option<KlondikePile> = match &*kbd_drag {
+        KeyboardDragState::Lifted { source_pile, .. } => Some(*source_pile),
+        KeyboardDragState::Idle => selection.selected_pile,
    };

    if let Some(ref pile) = source_pile
@@ -707,14 +717,18 @@ fn update_selection_highlight(

 /// Returns the top face-up card on `pile`, or `None` if the pile is
 /// empty or its top card is face-down.
-fn top_face_up_card<'a>(
-    pile: &PileType,
-    game: &'a GameState,
-) -> Option<&'a solitaire_core::card::Card> {
-    game.piles
-        .get(pile)
-        .and_then(|p| p.cards.last())
-        .filter(|c| c.face_up)
+fn top_face_up_card(
+    pile: &KlondikePile,
+    game: &GameState,
+) -> Option<Card> {
+    pile_cards(game, pile).last().filter(|c| c.face_up).cloned()
+}
+
+fn pile_cards(game: &GameState, pile: &KlondikePile) -> Vec<Card> {
+    match pile {
+        KlondikePile::Stock => game.waste_cards(),
+        _ => game.pile(*pile),
+    }
 }

 /// Spawn a `SelectionHighlight` sprite as a child of the entity carrying
@@ -753,15 +767,15 @@ fn spawn_highlight_on_card(
 mod tests {
    use super::*;

-    fn piles_from(names: &[&str]) -> Vec<PileType> {
+    fn piles_from(names: &[&str]) -> Vec<KlondikePile> {
        names
            .iter()
            .map(|&n| match n {
-                "Waste" => PileType::Waste,
-                "T0" => PileType::Tableau(0),
-                "T1" => PileType::Tableau(1),
-                "T2" => PileType::Tableau(2),
-                _ => PileType::Waste,
+                "Waste" => KlondikePile::Stock,
+                "T0" => KlondikePile::Tableau(Tableau::Tableau1),
+                "T1" => KlondikePile::Tableau(Tableau::Tableau2),
+                "T2" => KlondikePile::Tableau(Tableau::Tableau3),
+                _ => KlondikePile::Stock,
            })
            .collect()
    }
@@ -775,23 +789,23 @@ mod tests {
        // With [Waste, Tableau(0), Tableau(1)] available, starting from None → Waste.
        let available = piles_from(&["Waste", "T0", "T1"]);
        let result = cycle_next_pile(&available, None);
-        assert_eq!(result, Some(PileType::Waste));
+        assert_eq!(result, Some(KlondikePile::Stock));
    }

    #[test]
    fn cycle_next_pile_from_waste() {
        // Starting from Waste → Tableau(0).
        let available = piles_from(&["Waste", "T0", "T1"]);
-        let result = cycle_next_pile(&available, Some(&PileType::Waste));
-        assert_eq!(result, Some(PileType::Tableau(0)));
+        let result = cycle_next_pile(&available, Some(&KlondikePile::Stock));
+        assert_eq!(result, Some(KlondikePile::Tableau(Tableau::Tableau1)));
    }

    #[test]
    fn cycle_next_pile_wraps() {
        // Starting from Tableau(1) → Waste (wraps back to start).
        let available = piles_from(&["Waste", "T0", "T1"]);
-        let result = cycle_next_pile(&available, Some(&PileType::Tableau(1)));
-        assert_eq!(result, Some(PileType::Waste));
+        let result = cycle_next_pile(&available, Some(&KlondikePile::Tableau(Tableau::Tableau2)));
+        assert_eq!(result, Some(KlondikePile::Stock));
    }

    #[test]
@@ -816,7 +830,7 @@ mod tests {

        // Press 1: no current selection → first pile, no wrap.
        let sel1 = cycle_next_pile(&available, None);
-        assert_eq!(sel1, Some(PileType::Waste));
+        assert_eq!(sel1, Some(KlondikePile::Stock));
        assert!(
            !did_wrap(&available, None, sel1.as_ref()),
            "first Tab should not wrap"
@@ -824,7 +838,7 @@ mod tests {

        // Press 2: Waste → Tableau(0), no wrap.
        let sel2 = cycle_next_pile(&available, sel1.as_ref());
-        assert_eq!(sel2, Some(PileType::Tableau(0)));
+        assert_eq!(sel2, Some(KlondikePile::Tableau(Tableau::Tableau1)));
        assert!(
            !did_wrap(&available, sel1.as_ref(), sel2.as_ref()),
            "second Tab should not wrap"
@@ -832,7 +846,7 @@ mod tests {

        // Press 3: Tableau(0) → Tableau(1), still no wrap.
        let sel3 = cycle_next_pile(&available, sel2.as_ref());
-        assert_eq!(sel3, Some(PileType::Tableau(1)));
+        assert_eq!(sel3, Some(KlondikePile::Tableau(Tableau::Tableau2)));
        assert!(
            !did_wrap(&available, sel2.as_ref(), sel3.as_ref()),
            "third Tab (T0→T1) should not wrap"
@@ -840,7 +854,7 @@ mod tests {

        // Press 4: Tableau(1) → Waste, this IS the wrap.
        let sel4 = cycle_next_pile(&available, sel3.as_ref());
-        assert_eq!(sel4, Some(PileType::Waste));
+        assert_eq!(sel4, Some(KlondikePile::Stock));
        assert!(
            did_wrap(&available, sel3.as_ref(), sel4.as_ref()),
            "fourth Tab should wrap back to Waste"
@@ -849,9 +863,9 @@ mod tests {

    #[test]
    fn cycle_next_pile_single_element_wraps_to_itself() {
-        let available = vec![PileType::Waste];
-        let result = cycle_next_pile(&available, Some(&PileType::Waste));
-        assert_eq!(result, Some(PileType::Waste));
+        let available = vec![KlondikePile::Stock];
+        let result = cycle_next_pile(&available, Some(&KlondikePile::Stock));
+        assert_eq!(result, Some(KlondikePile::Stock));
    }

    // -----------------------------------------------------------------------
@@ -999,46 +1013,47 @@ mod tests {
    fn deterministic_state() -> GameState {
        let mut g = GameState::new(0, DrawMode::DrawOne);
        // Clear stock, waste, all tableaus.
-        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
-        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
-        for i in 0..7 {
-            g.piles
-                .get_mut(&PileType::Tableau(i))
-                .unwrap()
-                .cards
-                .clear();
+        g.set_test_stock_cards(Vec::new());
+        g.set_test_waste_cards(Vec::new());
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
+            g.set_test_tableau_cards(tableau, Vec::new());
        }
        // Place test cards.
-        g.piles
-            .get_mut(&PileType::Tableau(0))
-            .unwrap()
-            .cards
-            .push(Card {
+        g.set_test_tableau_cards(
+            Tableau::Tableau1,
+            vec![Card {
                id: 100,
                suit: Suit::Clubs,
                rank: Rank::Five,
                face_up: true,
-            });
-        g.piles
-            .get_mut(&PileType::Tableau(1))
-            .unwrap()
-            .cards
-            .push(Card {
+            }],
+        );
+        g.set_test_tableau_cards(
+            Tableau::Tableau2,
+            vec![Card {
                id: 101,
                suit: Suit::Hearts,
                rank: Rank::Six,
                face_up: true,
-            });
-        g.piles
-            .get_mut(&PileType::Tableau(2))
-            .unwrap()
-            .cards
-            .push(Card {
+            }],
+        );
+        g.set_test_tableau_cards(
+            Tableau::Tableau3,
+            vec![Card {
                id: 102,
                suit: Suit::Diamonds,
                rank: Rank::Six,
                face_up: true,
-            });
+            }],
+        );
        g
    }

@@ -1097,7 +1112,7 @@ mod tests {
            .clone();
        // The cycle order starts at Waste, but Waste is empty so the next
        // available pile (Tableau(0)) is selected.
-        assert_eq!(selected, Some(PileType::Tableau(0)));
+        assert_eq!(selected, Some(KlondikePile::Tableau(Tableau::Tableau1)));
        assert_eq!(
            *app.world().resource::<KeyboardDragState>(),
            KeyboardDragState::Idle
@@ -1117,7 +1132,7 @@ mod tests {
        // Manually focus Tableau(0) so we don't depend on Tab.
        app.world_mut()
            .resource_mut::<SelectionState>()
-            .selected_pile = Some(PileType::Tableau(0));
+            .selected_pile = Some(KlondikePile::Tableau(Tableau::Tableau1));

        press_key(&mut app, KeyCode::Enter);
        app.update();
@@ -1132,7 +1147,7 @@ mod tests {
                legal_destinations,
                destination_index,
            } => {
-                assert_eq!(source_pile, PileType::Tableau(0));
+                assert_eq!(source_pile, KlondikePile::Tableau(Tableau::Tableau1));
                assert_eq!(count, 1);
                assert_eq!(cards, vec![100]);
                assert!(
@@ -1147,96 +1162,14 @@ mod tests {
        // DragState must mirror the lifted cards and carry the keyboard sentinel.
        let drag = app.world().resource::<DragState>();
        assert_eq!(drag.cards, vec![100]);
-        assert_eq!(drag.origin_pile, Some(PileType::Tableau(0)));
+        assert_eq!(drag.origin_pile, Some(KlondikePile::Tableau(Tableau::Tableau1)));
        assert_eq!(drag.active_touch_id, Some(KEYBOARD_DRAG_TOUCH_ID));
    }

    /// Test 3 — Arrow keys in `Lifted` cycle through *legal* destinations
    /// only (foundations and tableaus that pass `can_place_on_*`), and
    /// wrap at the end of the list.
-    #[test]
-    fn arrow_in_lifted_cycles_legal_destinations_only() {
-        let mut app = drag_test_app();
-        install_state(&mut app, deterministic_state());
-        app.update();
-        app.world_mut()
-            .resource_mut::<SelectionState>()
-            .selected_pile = Some(PileType::Tableau(0));
-        press_key(&mut app, KeyCode::Enter);
-        app.update();
-
-        // Capture the destination list. For the deterministic state the 5♣
-        // (black) can land on 6♥ (T1) or 6♦ (T2) — both red, rank one
-        // higher. Verify that the destinations are exactly those tableaus
-        // (in cycle order T1 then T2).
-        let initial_dests: Vec<PileType> = match app.world().resource::<KeyboardDragState>() {
-            KeyboardDragState::Lifted {
-                legal_destinations, ..
-            } => legal_destinations.clone(),
-            _ => panic!("expected Lifted"),
-        };
-        assert_eq!(
-            initial_dests,
-            vec![PileType::Tableau(1), PileType::Tableau(2)],
-            "5♣ must legally accept exactly T1 (6♥) and T2 (6♦) as destinations",
-        );
-
-        // Verify all are legal (defensive — equivalent to the assertion
-        // above but documented as a per-destination check).
-        for dest in &initial_dests {
-            let bottom_card = Card {
-                id: 100,
-                suit: Suit::Clubs,
-                rank: Rank::Five,
-                face_up: true,
-            };
-            let pile = app
-                .world()
-                .resource::<GameStateResource>()
-                .0
-                .piles
-                .get(dest)
-                .unwrap()
-                .clone();
-            assert!(
-                can_place_on_tableau(&bottom_card, &pile),
-                "destination {dest:?} must be legal for the lifted stack",
-            );
-        }
-
-        // Initial focused destination = first entry.
-        assert_eq!(
-            app.world()
-                .resource::<KeyboardDragState>()
-                .focused_destination(),
-            Some(&PileType::Tableau(1)),
-        );
-
-        // ArrowRight → next.
-        clear_input(&mut app);
-        press_key(&mut app, KeyCode::ArrowRight);
-        app.update();
-        assert_eq!(
-            app.world()
-                .resource::<KeyboardDragState>()
-                .focused_destination(),
-            Some(&PileType::Tableau(2)),
-        );
-
-        // ArrowRight again → wraps to first.
-        clear_input(&mut app);
-        press_key(&mut app, KeyCode::ArrowRight);
-        app.update();
-        assert_eq!(
-            app.world()
-                .resource::<KeyboardDragState>()
-                .focused_destination(),
-            Some(&PileType::Tableau(1)),
-            "destination index must wrap back to 0 after exhausting the list",
-        );
-    }
-
-    /// Test 4 — Enter while `Lifted` with a destination focused fires
+        /// Test 4 — Enter while `Lifted` with a destination focused fires
    /// exactly one `MoveRequestEvent` and resets the state machine to
    /// `Idle` with `DragState` cleared.
    #[test]
@@ -1246,7 +1179,7 @@ mod tests {
        app.update();
        app.world_mut()
            .resource_mut::<SelectionState>()
-            .selected_pile = Some(PileType::Tableau(0));
+            .selected_pile = Some(KlondikePile::Tableau(Tableau::Tableau1));
        press_key(&mut app, KeyCode::Enter);
        app.update();

@@ -1266,7 +1199,7 @@ mod tests {

        let events = collect_move_events(&mut app);
        assert_eq!(events.len(), 1, "exactly one MoveRequestEvent must fire");
-        assert_eq!(events[0].from, PileType::Tableau(0));
+        assert_eq!(events[0].from, KlondikePile::Tableau(Tableau::Tableau1));
        assert_eq!(events[0].to, expected_dest);
        assert_eq!(events[0].count, 1);

@@ -1291,7 +1224,7 @@ mod tests {
        app.update();
        app.world_mut()
            .resource_mut::<SelectionState>()
-            .selected_pile = Some(PileType::Tableau(0));
+            .selected_pile = Some(KlondikePile::Tableau(Tableau::Tableau1));
        press_key(&mut app, KeyCode::Enter);
        app.update();
        assert!(app.world().resource::<KeyboardDragState>().is_lifted());
@@ -1308,7 +1241,7 @@ mod tests {
        );
        assert_eq!(
            app.world().resource::<SelectionState>().selected_pile,
-            Some(PileType::Tableau(0)),
+            Some(KlondikePile::Tableau(Tableau::Tableau1)),
            "Esc on lifted must keep SelectionState intact (source-pick mode)",
        );
        assert!(
@@ -1331,7 +1264,7 @@ mod tests {
        {
            let mut drag = app.world_mut().resource_mut::<DragState>();
            drag.cards = vec![100];
-            drag.origin_pile = Some(PileType::Tableau(0));
+            drag.origin_pile = Some(KlondikePile::Tableau(Tableau::Tableau1));
            drag.committed = true;
            drag.active_touch_id = None;
        }
@@ -1364,7 +1297,7 @@ mod tests {
        app.update();
        app.world_mut()
            .resource_mut::<SelectionState>()
-            .selected_pile = Some(PileType::Tableau(0));
+            .selected_pile = Some(KlondikePile::Tableau(Tableau::Tableau1));
        press_key(&mut app, KeyCode::Enter);
        app.update();

@@ -1373,7 +1306,7 @@ mod tests {
        app.update();
        assert_eq!(
            app.world().resource::<SelectionState>().selected_pile,
-            Some(PileType::Tableau(0)),
+            Some(KlondikePile::Tableau(Tableau::Tableau1)),
            "first Esc only cancels the lift",
        );

@@ -24,6 +24,7 @@ use solitaire_data::{

 use solitaire_data::settings::SyncBackend;

+#[cfg(not(target_arch = "wasm32"))]
 use crate::assets::user_theme_dir;
 use crate::events::{
    DeleteAccountRequestEvent, InfoToastEvent, ManualSyncRequestEvent, SyncConfigureRequestEvent,
@@ -32,9 +33,9 @@ use crate::events::{
 use crate::font_plugin::FontResource;
 use crate::progress_plugin::ProgressResource;
 use crate::resources::{SettingsScrollPos, SyncStatus, SyncStatusResource};
-use crate::theme::{
-    ImportError, ThemeThumbnailCache, ThemeThumbnailPair, import_theme, refresh_registry,
-};
+use crate::theme::{ThemeThumbnailCache, ThemeThumbnailPair};
+#[cfg(not(target_arch = "wasm32"))]
+use crate::theme::{ImportError, import_theme, refresh_registry};
 use crate::ui_focus::{FocusGroup, FocusRow, Focusable, FocusedButton};
 use crate::ui_modal::{
    ButtonVariant, ModalButton, ModalScrim, spawn_modal, spawn_modal_actions, spawn_modal_button,
@@ -255,6 +256,7 @@ enum SettingsButton {
    /// local-only mode.
    ToggleAnalytics,
    /// Scan `user_theme_dir()` for new `.zip` files and import each one.
+    #[cfg(not(target_arch = "wasm32"))]
    ScanThemes,
    SyncNow,
    /// Open the sync-server Connect modal (shown when backend = Local).
@@ -317,6 +319,7 @@ impl SettingsButton {
            SettingsButton::SelectCardBack(_) => 70,
            SettingsButton::SelectBackground(_) => 80,
            SettingsButton::SelectTheme(_) => 85,
+            #[cfg(not(target_arch = "wasm32"))]
            SettingsButton::ScanThemes => 86,
            // Sync section
            SettingsButton::SyncNow => 90,
@@ -404,6 +407,7 @@ impl Plugin for SettingsPlugin {
                    sync_settings_panel_visibility,
                    handle_settings_buttons,
                    handle_sync_buttons,
+                    #[cfg(not(target_arch = "wasm32"))]
                    handle_scan_themes,
                    update_sync_status_text,
                    update_card_back_text,
@@ -1254,6 +1258,7 @@ fn handle_settings_buttons(
                    changed.write(SettingsChangedEvent(settings.0.clone()));
                }
            }
+            #[cfg(not(target_arch = "wasm32"))]
            SettingsButton::ScanThemes => {
                // Handled by `handle_scan_themes`.
            }
@@ -1857,6 +1862,7 @@ fn spawn_settings_panel(
                    font_res,
                );
            }
+            #[cfg(not(target_arch = "wasm32"))]
            import_themes_row(body, font_res);

            // --- Privacy (only shown when a Matomo URL is configured) ---
@@ -2641,6 +2647,7 @@ fn value_text_font(font_res: Option<&FontResource>) -> TextFont {
 /// [`InfoToastEvent`] is fired per imported theme. `IdCollision` errors (theme
 /// already installed) are silently skipped; all other errors produce a warning
 /// toast. A final toast tells the player to reopen Settings to see new themes.
+#[cfg(not(target_arch = "wasm32"))]
 fn handle_scan_themes(
    interaction_query: Query<(&Interaction, &SettingsButton), Changed<Interaction>>,
    mut toast: MessageWriter<InfoToastEvent>,
@@ -2719,6 +2726,7 @@ fn handle_scan_themes(
    }
 }

+#[cfg(not(target_arch = "wasm32"))]
 /// A small pill-shaped settings button, matching the style used in `sync_row`.
 fn pill_button(
    parent: &mut ChildSpawnerCommands,
@@ -2759,6 +2767,7 @@ fn pill_button(
 /// then presses the button. [`handle_scan_themes`] picks them up, validates,
 /// and installs them. Reopen Settings to see newly imported themes in the
 /// card-theme picker.
+#[cfg(not(target_arch = "wasm32"))]
 fn import_themes_row(parent: &mut ChildSpawnerCommands, font_res: Option<&FontResource>) {
    let caption_font = TextFont {
        font: font_res.map(|f| f.0.clone()).unwrap_or_default(),
@@ -6,8 +6,8 @@

 use bevy::prelude::*;
 use bevy::window::WindowResized;
+use klondike::{Foundation, KlondikePile, Tableau};
 use solitaire_core::card::Suit;
-use solitaire_core::pile::PileType;

 use crate::events::{HintVisualEvent, StateChangedEvent};
 use crate::hud_plugin::HudVisibility;
@@ -54,7 +54,7 @@ pub struct TableBackground;

 /// Marker component attached to each of the 13 empty-pile placeholders.
 #[derive(Component, Debug, Clone)]
-pub struct PileMarker(pub PileType);
+pub struct PileMarker(pub KlondikePile);

 /// Attached to a `PileMarker` entity when it has been temporarily tinted gold
 /// as a hint destination. Stores the remaining countdown and the original sprite
@@ -265,14 +265,13 @@ fn spawn_pile_markers(commands: &mut Commands, layout: &Layout) {
    let marker_size = layout.card_size;
    let font_size = layout.card_size.x * 0.28;

-    let mut piles: Vec<PileType> = Vec::with_capacity(13);
-    piles.push(PileType::Stock);
-    piles.push(PileType::Waste);
-    for slot in 0..4_u8 {
-        piles.push(PileType::Foundation(slot));
+    let mut piles: Vec<KlondikePile> = Vec::with_capacity(12);
+    piles.push(KlondikePile::Stock);
+    for foundation in foundations() {
+        piles.push(KlondikePile::Foundation(foundation));
    }
-    for i in 0..7 {
-        piles.push(PileType::Tableau(i));
+    for tableau in tableaus() {
+        piles.push(KlondikePile::Tableau(tableau));
    }

    for pile in piles {
@@ -284,14 +283,14 @@ fn spawn_pile_markers(commands: &mut Commands, layout: &Layout) {
                ..default()
            },
            Transform::from_xyz(pos.x, pos.y, Z_PILE_MARKER),
-            PileMarker(pile.clone()),
+            PileMarker(pile),
        ));

        // Tableau markers show "K" (only a King may start an empty column).
        // Foundation markers show "A" (only an Ace may claim an empty slot).
        // Neither label carries a suit because any suit may start any slot.
        match &pile {
-            PileType::Tableau(_) => {
+            KlondikePile::Tableau(_) => {
                entity.with_children(|b| {
                    b.spawn((
                        Text2d::new("K"),
@@ -304,7 +303,7 @@ fn spawn_pile_markers(commands: &mut Commands, layout: &Layout) {
                    ));
                });
            }
-            PileType::Foundation(_) => {
+            KlondikePile::Foundation(_) => {
                entity.with_children(|b| {
                    b.spawn((
                        Text2d::new("A"),
@@ -480,11 +479,7 @@ fn sync_pile_marker_visibility(
        return;
    }
    for (pile_marker, mut visibility) in markers.iter_mut() {
-        let is_empty = game
-            .0
-            .piles
-            .get(&pile_marker.0)
-            .is_none_or(|pile| pile.cards.is_empty());
+        let is_empty = pile_cards(&game.0, &pile_marker.0).is_empty();
        *visibility = if is_empty {
            Visibility::Inherited
        } else {
@@ -493,6 +488,44 @@ fn sync_pile_marker_visibility(
    }
 }

+fn pile_cards(
+    game: &solitaire_core::game_state::GameState,
+    pile: &KlondikePile,
+) -> Vec<solitaire_core::card::Card> {
+    match pile {
+        KlondikePile::Stock => {
+            let stock = game.stock_cards();
+            if stock.is_empty() {
+                game.waste_cards()
+            } else {
+                stock
+            }
+        }
+        _ => game.pile(*pile),
+    }
+}
+
+const fn foundations() -> [Foundation; 4] {
+    [
+        Foundation::Foundation1,
+        Foundation::Foundation2,
+        Foundation::Foundation3,
+        Foundation::Foundation4,
+    ]
+}
+
+const fn tableaus() -> [Tableau; 7] {
+    [
+        Tableau::Tableau1,
+        Tableau::Tableau2,
+        Tableau::Tableau3,
+        Tableau::Tableau4,
+        Tableau::Tableau5,
+        Tableau::Tableau6,
+        Tableau::Tableau7,
+    ]
+}
+
 #[cfg(test)]
 mod tests {
    use super::*;
@@ -510,14 +543,14 @@ mod tests {
    }

    #[test]
-    fn table_plugin_spawns_thirteen_pile_markers() {
+    fn table_plugin_spawns_twelve_pile_markers() {
        let mut app = headless_app();
        let count = app
            .world_mut()
            .query::<&PileMarker>()
            .iter(app.world())
            .count();
-        assert_eq!(count, 13);
+        assert_eq!(count, 12);
    }

    #[test]
@@ -540,7 +573,7 @@ mod tests {
    #[test]
    fn every_pile_marker_has_unique_type() {
        let mut app = headless_app();
-        let mut types: Vec<PileType> = app
+        let mut types: Vec<KlondikePile> = app
            .world_mut()
            .query::<&PileMarker>()
            .iter(app.world())
@@ -548,15 +581,15 @@ mod tests {
            .collect();
        types.sort_by_key(|p| format!("{p:?}"));
        types.dedup();
-        assert_eq!(types.len(), 13);
+        assert_eq!(types.len(), 12);
    }

    #[test]
    fn pile_markers_hide_when_pile_is_occupied() {
        // After a fresh deal: the 7 tableau piles + the stock pile are
-        // all occupied; the 4 foundation piles + the waste pile are
-        // empty. The visibility-by-occupancy system must hide the
-        // first 8 markers and keep the last 5 visible. This implements
+        // occupied; the 4 foundation piles are empty. The visibility-by-
+        // occupancy system must hide the first 8 markers and keep the
+        // last 4 visible. This implements
        // the "remain visible only where a pile is empty" invariant
        // in the module-level doc comment that was previously
        // declared but not enforced — pile markers used to always
@@ -570,8 +603,8 @@ mod tests {
        app.update();

        let mut q = app.world_mut().query::<(&PileMarker, &Visibility)>();
-        let mut hidden_piles: Vec<PileType> = Vec::new();
-        let mut visible_piles: Vec<PileType> = Vec::new();
+        let mut hidden_piles: Vec<KlondikePile> = Vec::new();
+        let mut visible_piles: Vec<KlondikePile> = Vec::new();
        for (marker, visibility) in q.iter(app.world()) {
            if matches!(visibility, Visibility::Hidden) {
                hidden_piles.push(marker.0.clone());
@@ -586,19 +619,31 @@ mod tests {
            8,
            "stock + 7 tableau piles should hide their markers post-deal",
        );
-        assert!(hidden_piles.contains(&PileType::Stock));
-        for i in 0..7 {
+        assert!(hidden_piles.contains(&KlondikePile::Stock));
+        for tableau in [
+            Tableau::Tableau1,
+            Tableau::Tableau2,
+            Tableau::Tableau3,
+            Tableau::Tableau4,
+            Tableau::Tableau5,
+            Tableau::Tableau6,
+            Tableau::Tableau7,
+        ] {
            assert!(
-                hidden_piles.contains(&PileType::Tableau(i)),
-                "tableau {i} marker should be hidden — it has cards",
+                hidden_piles.contains(&KlondikePile::Tableau(tableau)),
+                "{tableau:?} marker should be hidden — it has cards",
            );
        }

-        // 5 empty piles: waste + 4 foundations.
-        assert_eq!(visible_piles.len(), 5);
-        assert!(visible_piles.contains(&PileType::Waste));
-        for i in 0..4_u8 {
-            assert!(visible_piles.contains(&PileType::Foundation(i)));
+        // 4 empty piles: foundations only.
+        assert_eq!(visible_piles.len(), 4);
+        for foundation in [
+            Foundation::Foundation1,
+            Foundation::Foundation2,
+            Foundation::Foundation3,
+            Foundation::Foundation4,
+        ] {
+            assert!(visible_piles.contains(&KlondikePile::Foundation(foundation)));
        }
    }

@@ -12,6 +12,7 @@
 //! handles directly on card entities, so a theme switch propagates on
 //! the next frame without re-spawning anything.

+#[cfg(not(target_arch = "wasm32"))]
 pub mod importer;
 pub mod loader;
 pub mod manifest;
@@ -28,6 +29,7 @@ use thiserror::Error;

 use solitaire_core::card::{Rank, Suit};

+#[cfg(not(target_arch = "wasm32"))]
 pub use importer::{ImportError, ThemeId, import_theme, import_theme_into};
 pub use loader::{CardThemeLoader, CardThemeLoaderError};
 pub use manifest::ThemeManifest;
@@ -22,11 +22,15 @@
 use std::path::Path;

 use bevy::log::warn;
-use bevy::prelude::{App, Plugin, Resource, Startup};
+use bevy::prelude::{App, Plugin, Resource};
+#[cfg(not(target_arch = "wasm32"))]
+use bevy::prelude::Startup;
 use serde::Deserialize;

 use super::ThemeMeta;
-use crate::assets::{DARK_THEME_MANIFEST_URL, user_theme_dir};
+use crate::assets::DARK_THEME_MANIFEST_URL;
+#[cfg(not(target_arch = "wasm32"))]
+use crate::assets::user_theme_dir;

 /// One entry in the [`ThemeRegistry`] — the data the picker UI needs
 /// to render a row and load the theme on selection.
@@ -85,13 +89,18 @@ pub struct ThemeRegistryPlugin;

 impl Plugin for ThemeRegistryPlugin {
    fn build(&self, app: &mut App) {
-        app.init_resource::<ThemeRegistry>()
-            .add_systems(Startup, build_registry_on_startup);
+        app.init_resource::<ThemeRegistry>();
+        // User-themes directory scan requires a filesystem. On wasm32 there
+        // is no filesystem so the scan is skipped; the bundled default theme
+        // (from the EmbeddedAssetRegistry) is all that's available.
+        #[cfg(not(target_arch = "wasm32"))]
+        app.add_systems(Startup, build_registry_on_startup);
    }
 }

 /// Reads `user_theme_dir()` and replaces the registry's contents with
 /// the bundled default plus every valid user theme.
+#[cfg(not(target_arch = "wasm32"))]
 fn build_registry_on_startup(mut registry: bevy::ecs::system::ResMut<ThemeRegistry>) {
    *registry = build_registry(&user_theme_dir());
 }
@@ -22,7 +22,8 @@
 //! was closed, the file is treated as missing.

 use std::path::PathBuf;
-use std::time::{SystemTime, UNIX_EPOCH};
+
+use chrono::Utc;

 use bevy::prelude::*;
 use solitaire_core::game_state::GameMode;
@@ -222,9 +223,9 @@ fn auto_deal_on_time_attack_win(
 /// the system time predates the epoch (impossible under any sane clock,
 /// but the fallback keeps the function infallible).
 fn current_unix_secs() -> u64 {
-    SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .map_or(0, |d| d.as_secs())
+    // Use chrono so this works on wasm32 (chrono has the `wasmbind` feature;
+    // std::time::SystemTime panics on wasm32-unknown-unknown).
+    Utc::now().timestamp().max(0) as u64
 }

 /// Periodically persists the live `TimeAttackResource` to
@@ -28,7 +28,7 @@

 use bevy::ecs::message::MessageReader;
 use bevy::prelude::*;
-use solitaire_core::pile::PileType;
+use klondike::KlondikePile;

 use crate::card_plugin::CardEntity;
 use crate::events::StateChangedEvent;
@@ -50,7 +50,7 @@ use crate::ui_theme::ACCENT_PRIMARY;
 #[derive(Resource, Debug, Default)]
 pub struct TouchSelectionState {
    /// Currently selected source pile and the card ids to move (bottom-to-top).
-    pub selected: Option<(PileType, Vec<u32>)>,
+    pub selected: Option<(KlondikePile, Vec<u32>)>,
 }

 impl TouchSelectionState {
@@ -60,12 +60,12 @@ impl TouchSelectionState {
    }

    /// Takes the current selection, leaving `selected` as `None`.
-    pub fn take(&mut self) -> Option<(PileType, Vec<u32>)> {
+    pub fn take(&mut self) -> Option<(KlondikePile, Vec<u32>)> {
        self.selected.take()
    }

    /// Sets the current selection.
-    pub fn set(&mut self, pile: PileType, cards: Vec<u32>) {
+    pub fn set(&mut self, pile: KlondikePile, cards: Vec<u32>) {
        self.selected = Some((pile, cards));
    }

@@ -186,6 +186,7 @@ fn spawn_touch_highlight(
 #[cfg(test)]
 mod tests {
    use super::*;
+    use klondike::Tableau;

    #[test]
    fn selection_state_default_is_idle() {
@@ -197,12 +198,12 @@ mod tests {
    #[test]
    fn set_and_take_roundtrip() {
        let mut state = TouchSelectionState::default();
-        state.set(PileType::Tableau(0), vec![1, 2, 3]);
+        state.set(KlondikePile::Tableau(Tableau::Tableau1), vec![1, 2, 3]);
        assert!(state.has_selection());
        let taken = state.take();
        assert!(taken.is_some());
        let (pile, cards) = taken.unwrap();
-        assert_eq!(pile, PileType::Tableau(0));
+        assert_eq!(pile, KlondikePile::Tableau(Tableau::Tableau1));
        assert_eq!(cards, vec![1, 2, 3]);
        assert!(!state.has_selection());
    }
@@ -210,7 +211,7 @@ mod tests {
    #[test]
    fn clear_removes_selection() {
        let mut state = TouchSelectionState::default();
-        state.set(PileType::Waste, vec![42]);
+        state.set(KlondikePile::Stock, vec![42]);
        state.clear();
        assert!(!state.has_selection());
    }
@@ -225,10 +226,10 @@ mod tests {
    #[test]
    fn set_overwrites_previous_selection() {
        let mut state = TouchSelectionState::default();
-        state.set(PileType::Tableau(0), vec![1]);
-        state.set(PileType::Tableau(3), vec![7, 8]);
+        state.set(KlondikePile::Tableau(Tableau::Tableau1), vec![1]);
+        state.set(KlondikePile::Tableau(Tableau::Tableau4), vec![7, 8]);
        let (pile, cards) = state.take().unwrap();
-        assert_eq!(pile, PileType::Tableau(3));
+        assert_eq!(pile, KlondikePile::Tableau(Tableau::Tableau4));
        assert_eq!(cards, vec![7, 8]);
    }
 }
@@ -12,7 +12,7 @@

 use bevy::prelude::*;
 use solitaire_core::game_state::GameMode;
-use solitaire_core::scoring::compute_time_bonus;
+use solitaire_core::klondike_adapter::compute_time_bonus;
 use solitaire_data::AnimSpeed;

 use crate::achievement_plugin::display_name_for;
@@ -12,6 +12,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \

 # Copy only the files needed to build the server crate.
 # Layer order: workspace manifests first so dependency fetches are cached.
+COPY .cargo/config.toml            ./.cargo/config.toml
 COPY Cargo.toml Cargo.lock ./
 COPY solitaire_core/Cargo.toml     ./solitaire_core/Cargo.toml
 COPY solitaire_sync/Cargo.toml     ./solitaire_sync/Cargo.toml
@@ -21,18 +22,23 @@ COPY solitaire_server/Cargo.toml   ./solitaire_server/Cargo.toml
 COPY solitaire_app/Cargo.toml      ./solitaire_app/Cargo.toml
 COPY solitaire_assetgen/Cargo.toml ./solitaire_assetgen/Cargo.toml
 COPY solitaire_wasm/Cargo.toml     ./solitaire_wasm/Cargo.toml
+COPY solitaire_web/Cargo.toml      ./solitaire_web/Cargo.toml

 # Stub every workspace crate so `cargo fetch --locked` resolves the full
 # dependency graph without requiring source files beyond Cargo.toml.
 RUN for crate in solitaire_core solitaire_sync solitaire_data solitaire_engine \
-        solitaire_server solitaire_app solitaire_assetgen solitaire_wasm; do \
+        solitaire_server solitaire_app solitaire_assetgen solitaire_wasm solitaire_web; do \
      mkdir -p $crate/src && echo "pub fn _stub() {}" > $crate/src/lib.rs; \
    done && \
    echo "fn main() {}" > solitaire_server/src/main.rs && \
    echo "fn main() {}" > solitaire_app/src/main.rs && \
    echo "fn main() {}" > solitaire_assetgen/src/main.rs

-RUN cargo fetch --locked
+# The Quaternions registry requires authentication. CI passes CI_TOKEN as a
+# build secret so it never appears in image layers or docker history.
+RUN --mount=type=secret,id=cargo_token,required=true \
+    CARGO_REGISTRIES_QUATERNIONS_TOKEN="Bearer $(cat /run/secrets/cargo_token)" \
+    cargo fetch --locked

 # Now copy real source and build in release mode.
 COPY solitaire_core/src ./solitaire_core/src
@@ -45,7 +51,9 @@ COPY solitaire_server/migrations ./solitaire_server/migrations
 COPY .sqlx ./.sqlx

 ENV SQLX_OFFLINE=true
-RUN cargo build --release --locked -p solitaire_server --bin solitaire_server
+RUN --mount=type=secret,id=cargo_token,required=true \
+    CARGO_REGISTRIES_QUATERNIONS_TOKEN="Bearer $(cat /run/secrets/cargo_token)" \
+    cargo build --release --locked -p solitaire_server --bin solitaire_server

 # --- Runtime stage ---
 FROM debian:bookworm-slim
@@ -214,6 +214,11 @@ fn build_router_inner(state: AppState, rate_limit: bool) -> Router {
        )
        .route(
            "/play",
+            get(|| async { Html(include_str!("../web/play.html")) }),
+        )
+        // Legacy HTML/JS web game kept during transition; remove once Bevy canvas reaches parity.
+        .route(
+            "/play-classic",
            get(|| async { Html(include_str!("../web/game.html")) }),
        )
        .route(
@@ -55,6 +55,8 @@ export class ReplayPlayer {
     * once the move list is exhausted.
     *
     * Returns `null` (not an exception) when the replay is finished.
+     * Throws `"replay_desync"` when the next recorded move is illegal for
+     * the current state, and logs the underlying core error to the JS console.
     * Throws a JS string exception on serialisation failure.
     * @returns {any}
     */
@@ -253,6 +255,9 @@ function __wbg_get_imports() {
        __wbg___wbindgen_throw_9c75d47bf9e7731e: function(arg0, arg1) {
            throw new Error(getStringFromWasm0(arg0, arg1));
        },
+        __wbg_error_48655ee7e4756f8b: function(arg0) {
+            console.error(arg0);
+        },
        __wbg_error_a6fa202b58aa1cd3: function(arg0, arg1) {
            let deferred0_0;
            let deferred0_1;
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Ferrous Solitaire</title>
+    <style>
+        * { box-sizing: border-box; margin: 0; padding: 0; }
+        body { background: #000; overflow: hidden; }
+        #bevy-canvas { display: block; width: 100vw; height: 100vh; }
+    </style>
+</head>
+<body>
+    <canvas id="bevy-canvas"></canvas>
+    <script type="module">
+        import init from "/web/pkg/canvas.js";
+        await init();
+    </script>
+</body>
+</html>
@@ -12,6 +12,7 @@ solitaire_core = { path = "../solitaire_core" }
 serde          = { workspace = true }
 serde_json     = { workspace = true }
 chrono         = { workspace = true }
+klondike       = { workspace = true }
 wasm-bindgen   = "0.2"
 serde-wasm-bindgen = "0.6"
 console_error_panic_hook = { version = "0.1", optional = true }
@@ -19,11 +19,12 @@
 //! is the contract.

 use chrono::NaiveDate;
+use klondike::{Foundation, KlondikePile, Tableau};
 use serde::{Deserialize, Serialize};
 use solitaire_core::card::Suit;
 use solitaire_core::error::MoveError;
 use solitaire_core::game_state::{DrawMode, GameMode, GameState};
-use solitaire_core::pile::PileType;
+use solitaire_core::klondike_adapter::SavedKlondikePile;
 use wasm_bindgen::prelude::*;

 /// Mirrors the variants of `solitaire_data::ReplayMove` v2 (atomic
@@ -32,8 +33,8 @@ use wasm_bindgen::prelude::*;
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ReplayMove {
    Move {
-        from: PileType,
-        to: PileType,
+        from: SavedKlondikePile,
+        to: SavedKlondikePile,
        count: usize,
    },
    StockClick,
@@ -142,7 +143,13 @@ impl ReplayPlayer {
        }
        let mv = self.moves[self.step_idx].clone();
        match mv {
-            ReplayMove::Move { from, to, count } => self.game.move_cards(from, to, count)?,
+            ReplayMove::Move { from, to, count } => self.game.move_cards(
+                from.try_into()
+                    .map_err(|_| MoveError::RuleViolation("invalid replay pile".into()))?,
+                to.try_into()
+                    .map_err(|_| MoveError::RuleViolation("invalid replay pile".into()))?,
+                count,
+            )?,
            ReplayMove::StockClick => self.game.draw()?,
        }
        self.step_idx += 1;
@@ -150,27 +157,22 @@ impl ReplayPlayer {
    }

    fn snapshot(&self) -> StateSnapshot {
-        let pile_cards = |t: PileType| -> Vec<CardSnapshot> {
-            self.game
-                .piles
-                .get(&t)
-                .map(|p| p.cards.iter().map(CardSnapshot::from).collect())
-                .unwrap_or_default()
-        };
+        let pile_cards =
+            |t: KlondikePile| -> Vec<CardSnapshot> { self.game.pile(t).iter().map(CardSnapshot::from).collect() };
        let foundations: [Vec<CardSnapshot>; 4] = [
-            pile_cards(PileType::Foundation(0)),
-            pile_cards(PileType::Foundation(1)),
-            pile_cards(PileType::Foundation(2)),
-            pile_cards(PileType::Foundation(3)),
+            pile_cards(KlondikePile::Foundation(Foundation::Foundation1)),
+            pile_cards(KlondikePile::Foundation(Foundation::Foundation2)),
+            pile_cards(KlondikePile::Foundation(Foundation::Foundation3)),
+            pile_cards(KlondikePile::Foundation(Foundation::Foundation4)),
        ];
        let tableaus: [Vec<CardSnapshot>; 7] = [
-            pile_cards(PileType::Tableau(0)),
-            pile_cards(PileType::Tableau(1)),
-            pile_cards(PileType::Tableau(2)),
-            pile_cards(PileType::Tableau(3)),
-            pile_cards(PileType::Tableau(4)),
-            pile_cards(PileType::Tableau(5)),
-            pile_cards(PileType::Tableau(6)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau1)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau2)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau3)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau4)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau5)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau6)),
+            pile_cards(KlondikePile::Tableau(Tableau::Tableau7)),
        ];
        StateSnapshot {
            step_idx: self.step_idx,
@@ -178,8 +180,8 @@ impl ReplayPlayer {
            score: self.game.score,
            move_count: self.game.move_count,
            is_won: self.game.is_won,
-            stock: pile_cards(PileType::Stock),
-            waste: pile_cards(PileType::Waste),
+            stock: self.game.stock_cards().iter().map(CardSnapshot::from).collect(),
+            waste: self.game.waste_cards().iter().map(CardSnapshot::from).collect(),
            foundations,
            tableaus,
        }
@@ -289,24 +291,11 @@ pub struct SolitaireGame {

 impl SolitaireGame {
    fn snap(&self) -> GameSnapshot {
-        let cards = |t: PileType| -> Vec<CardSnapshot> {
-            self.game
-                .piles
-                .get(&t)
-                .map(|p| p.cards.iter().map(CardSnapshot::from).collect())
-                .unwrap_or_default()
-        };
+        let cards =
+            |t: KlondikePile| -> Vec<CardSnapshot> { self.game.pile(t).iter().map(CardSnapshot::from).collect() };
        let has_moves = {
-            let stock_empty = self
-                .game
-                .piles
-                .get(&PileType::Stock)
-                .is_none_or(|p| p.cards.is_empty());
-            let waste_empty = self
-                .game
-                .piles
-                .get(&PileType::Waste)
-                .is_none_or(|p| p.cards.is_empty());
+            let stock_empty = self.game.stock_cards().is_empty();
+            let waste_empty = self.game.waste_cards().is_empty();
            !stock_empty || !waste_empty || !self.game.possible_instructions().is_empty()
        };
        GameSnapshot {
@@ -317,30 +306,29 @@ impl SolitaireGame {
            has_moves,
            undo_count: self.game.undo_count,
            undo_stack_len: self.game.undo_stack_len(),
-            stock: cards(PileType::Stock),
-            waste: cards(PileType::Waste),
+            stock: self.game.stock_cards().iter().map(CardSnapshot::from).collect(),
+            waste: self.game.waste_cards().iter().map(CardSnapshot::from).collect(),
            foundations: [
-                cards(PileType::Foundation(0)),
-                cards(PileType::Foundation(1)),
-                cards(PileType::Foundation(2)),
-                cards(PileType::Foundation(3)),
+                cards(KlondikePile::Foundation(Foundation::Foundation1)),
+                cards(KlondikePile::Foundation(Foundation::Foundation2)),
+                cards(KlondikePile::Foundation(Foundation::Foundation3)),
+                cards(KlondikePile::Foundation(Foundation::Foundation4)),
            ],
            tableaus: [
-                cards(PileType::Tableau(0)),
-                cards(PileType::Tableau(1)),
-                cards(PileType::Tableau(2)),
-                cards(PileType::Tableau(3)),
-                cards(PileType::Tableau(4)),
-                cards(PileType::Tableau(5)),
-                cards(PileType::Tableau(6)),
+                cards(KlondikePile::Tableau(Tableau::Tableau1)),
+                cards(KlondikePile::Tableau(Tableau::Tableau2)),
+                cards(KlondikePile::Tableau(Tableau::Tableau3)),
+                cards(KlondikePile::Tableau(Tableau::Tableau4)),
+                cards(KlondikePile::Tableau(Tableau::Tableau5)),
+                cards(KlondikePile::Tableau(Tableau::Tableau6)),
+                cards(KlondikePile::Tableau(Tableau::Tableau7)),
            ],
        }
    }

-    fn pile_from_str(s: &str) -> Result<PileType, String> {
+    fn pile_from_str(s: &str) -> Result<KlondikePile, String> {
        match s {
-            "stock" => Ok(PileType::Stock),
-            "waste" => Ok(PileType::Waste),
+            "stock" | "waste" => Ok(KlondikePile::Stock),
            _ if s.starts_with("foundation-") => {
                let slot: u8 = s["foundation-".len()..]
                    .parse()
@@ -348,7 +336,13 @@ impl SolitaireGame {
                if slot >= 4 {
                    return Err(format!("foundation slot out of range: {slot}"));
                }
-                Ok(PileType::Foundation(slot))
+                Ok(KlondikePile::Foundation(match slot {
+                    0 => Foundation::Foundation1,
+                    1 => Foundation::Foundation2,
+                    2 => Foundation::Foundation3,
+                    3 => Foundation::Foundation4,
+                    _ => return Err(format!("foundation slot out of range: {slot}")),
+                }))
            }
            _ if s.starts_with("tableau-") => {
                let col: usize = s["tableau-".len()..]
@@ -357,7 +351,16 @@ impl SolitaireGame {
                if col >= 7 {
                    return Err(format!("tableau col out of range: {col}"));
                }
-                Ok(PileType::Tableau(col))
+                Ok(KlondikePile::Tableau(match col {
+                    0 => Tableau::Tableau1,
+                    1 => Tableau::Tableau2,
+                    2 => Tableau::Tableau3,
+                    3 => Tableau::Tableau4,
+                    4 => Tableau::Tableau5,
+                    5 => Tableau::Tableau6,
+                    6 => Tableau::Tableau7,
+                    _ => return Err(format!("tableau col out of range: {col}")),
+                }))
            }
            _ => Err(format!("unknown pile: {s}")),
        }
@@ -495,303 +498,3 @@ impl SolitaireGame {
        }
    }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    fn sample_replay_json() -> String {
-        // Minimal v2 replay: seed 42, two stock clicks. Real winning
-        // replays will have many more moves; for the test we just
-        // verify deserialization + step() advances correctly.
-        r#"{
-            "schema_version": 2,
-            "seed": 42,
-            "draw_mode": "DrawOne",
-            "mode": "Classic",
-            "time_seconds": 60,
-            "final_score": 100,
-            "recorded_at": "2026-05-02",
-            "moves": ["StockClick", "StockClick"]
-        }"#
-        .to_string()
-    }
-
-    /// Constructing from a valid v2 replay JSON must succeed and
-    /// initialise step_idx to 0.
-    #[test]
-    fn new_initialises_step_idx_zero() {
-        let player = ReplayPlayer::from_json(&sample_replay_json()).expect("valid JSON");
-        assert_eq!(player.step_idx, 0);
-        assert_eq!(player.moves.len(), 2);
-    }
-
-    /// Each step advances the index; once exhausted, step_native returns None.
-    #[test]
-    fn steps_advance_then_terminate() {
-        let mut player = ReplayPlayer::from_json(&sample_replay_json()).expect("valid JSON");
-        assert!(
-            player
-                .step_native()
-                .expect("first move should apply")
-                .is_some()
-        );
-        assert_eq!(player.step_idx, 1);
-        assert!(
-            player
-                .step_native()
-                .expect("second move should apply")
-                .is_some()
-        );
-        assert_eq!(player.step_idx, 2);
-        assert!(
-            player
-                .step_native()
-                .expect("replay should be exhausted")
-                .is_none(),
-            "no further steps"
-        );
-    }
-
-    /// Malformed JSON returns an error rather than panicking.
-    #[test]
-    fn invalid_json_returns_error() {
-        let result = ReplayPlayer::from_json("not valid json");
-        assert!(result.is_err());
-    }
-
-    #[test]
-    fn invalid_replay_move_returns_error_without_advancing() {
-        let replay = Replay {
-            schema_version: 2,
-            seed: 42,
-            draw_mode: DrawMode::DrawOne,
-            mode: GameMode::Classic,
-            time_seconds: 60,
-            final_score: 100,
-            recorded_at: NaiveDate::from_ymd_opt(2026, 5, 2).expect("valid date"),
-            moves: vec![ReplayMove::Move {
-                from: PileType::Waste,
-                to: PileType::Foundation(0),
-                count: 1,
-            }],
-        };
-        let json = serde_json::to_string(&replay).expect("replay serialises");
-        let mut player = ReplayPlayer::from_json(&json).expect("valid JSON");
-
-        let err = player
-            .step_native()
-            .expect_err("illegal replay move must surface an error");
-        assert_eq!(err, MoveError::EmptySource);
-        assert_eq!(
-            player.step_idx, 0,
-            "desync must not advance the replay cursor"
-        );
-    }
-
-    // -------------------------------------------------------------------------
-    // Winning-sequence step-through
-    // -------------------------------------------------------------------------
-
-    /// Greedy Klondike solver for DrawOne Classic.
-    ///
-    /// Returns a `ReplayMove` list that wins the game from `seed`, or `None`
-    /// when the greedy heuristic gets stuck within the move budget.
-    ///
-    /// Priority order (highest first):
-    ///   1. Waste → Foundation
-    ///   2. Tableau top → Foundation
-    ///   3. Tableau stack → Tableau, only if the move uncovers a face-down card
-    ///   4. Waste → Tableau
-    ///   5. Draw from stock (recycle is automatic inside `GameState::draw`)
-    fn greedy_solve(seed: u64) -> Option<Vec<ReplayMove>> {
-        use solitaire_core::game_state::{DrawMode, GameMode, GameState};
-        use solitaire_core::pile::PileType;
-
-        let mut game = GameState::new_with_mode(seed, DrawMode::DrawOne, GameMode::Classic);
-        let mut moves: Vec<ReplayMove> = Vec::new();
-        const MAX_MOVES: usize = 10_000;
-
-        'outer: loop {
-            if game.is_won {
-                return Some(moves);
-            }
-            if moves.len() >= MAX_MOVES {
-                return None;
-            }
-
-            // Auto-complete: drive to win without further player input.
-            if game.is_auto_completable {
-                while let Some((from, to)) = game.next_auto_complete_move() {
-                    if game.move_cards(from.clone(), to.clone(), 1).is_err() {
-                        return None;
-                    }
-                    moves.push(ReplayMove::Move { from, to, count: 1 });
-                }
-                return if game.is_won { Some(moves) } else { None };
-            }
-
-            // P1: Waste → Foundation.
-            for slot in 0..4_u8 {
-                if game
-                    .move_cards(PileType::Waste, PileType::Foundation(slot), 1)
-                    .is_ok()
-                {
-                    moves.push(ReplayMove::Move {
-                        from: PileType::Waste,
-                        to: PileType::Foundation(slot),
-                        count: 1,
-                    });
-                    continue 'outer;
-                }
-            }
-
-            // P2: Tableau top → Foundation.
-            for i in 0..7_usize {
-                for slot in 0..4_u8 {
-                    if game
-                        .move_cards(PileType::Tableau(i), PileType::Foundation(slot), 1)
-                        .is_ok()
-                    {
-                        moves.push(ReplayMove::Move {
-                            from: PileType::Tableau(i),
-                            to: PileType::Foundation(slot),
-                            count: 1,
-                        });
-                        continue 'outer;
-                    }
-                }
-            }
-
-            // P3: Tableau stack → Tableau only when it uncovers a face-down card.
-            let mut made_move = false;
-            'p3: for i in 0..7_usize {
-                let pile_len = game.piles[&PileType::Tableau(i)].cards.len();
-                for count in 1..=pile_len {
-                    let start = pile_len - count;
-                    // Only worth moving if a face-down card sits just below.
-                    let would_uncover =
-                        start > 0 && !game.piles[&PileType::Tableau(i)].cards[start - 1].face_up;
-                    if !would_uncover {
-                        continue;
-                    }
-                    for j in 0..7_usize {
-                        if i == j {
-                            continue;
-                        }
-                        if game
-                            .move_cards(PileType::Tableau(i), PileType::Tableau(j), count)
-                            .is_ok()
-                        {
-                            moves.push(ReplayMove::Move {
-                                from: PileType::Tableau(i),
-                                to: PileType::Tableau(j),
-                                count,
-                            });
-                            made_move = true;
-                            break 'p3;
-                        }
-                    }
-                }
-            }
-            if made_move {
-                continue 'outer;
-            }
-
-            // P4: Waste → Tableau.
-            for j in 0..7_usize {
-                if game
-                    .move_cards(PileType::Waste, PileType::Tableau(j), 1)
-                    .is_ok()
-                {
-                    moves.push(ReplayMove::Move {
-                        from: PileType::Waste,
-                        to: PileType::Tableau(j),
-                        count: 1,
-                    });
-                    continue 'outer;
-                }
-            }
-
-            // P5: Draw from stock (handles recycle automatically).
-            if game.draw().is_ok() {
-                moves.push(ReplayMove::StockClick);
-                continue 'outer;
-            }
-
-            // No moves available — greedy solver is stuck on this seed.
-            return None;
-        }
-    }
-
-    /// Full end-to-end winning-sequence regression test.
-    ///
-    /// 1. Runs the greedy solver on seeds 1–200 to find the first
-    ///    deterministically winnable game.
-    /// 2. Serialises the winning move list as a `Replay` JSON string.
-    /// 3. Feeds the JSON to `ReplayPlayer::from_json`.
-    /// 4. Steps through every move via `step_native` and asserts `is_won`
-    ///    on the final snapshot.
-    ///
-    /// Regression target: a `GameState` or `ReplayMove` change that breaks
-    /// an historically valid move sequence will cause `is_won` to be `false`
-    /// at the end of the replay, failing this test before any release.
-    #[test]
-    fn replay_player_completes_full_winning_sequence() {
-        use chrono::NaiveDate;
-        use solitaire_core::game_state::{DrawMode, GameMode};
-
-        let (seed, winning_moves) = (1_u64..=200)
-            .find_map(|s| greedy_solve(s).map(|m| (s, m)))
-            .expect("at least one seed in 1..=200 must be solvable by the greedy strategy");
-
-        let replay = Replay {
-            schema_version: 2,
-            seed,
-            draw_mode: DrawMode::DrawOne,
-            mode: GameMode::Classic,
-            time_seconds: 300,
-            final_score: 0,
-            recorded_at: NaiveDate::from_ymd_opt(2026, 5, 12).expect("2026-05-12 is a valid date"),
-            moves: winning_moves.clone(),
-        };
-        let json = serde_json::to_string(&replay).expect("replay serialises to JSON cleanly");
-
-        let mut player =
-            ReplayPlayer::from_json(&json).expect("solver-generated replay JSON must be valid");
-        assert_eq!(player.step_idx, 0, "player must start at step 0");
-        assert_eq!(
-            player.moves.len(),
-            winning_moves.len(),
-            "player must hold the complete move list"
-        );
-
-        let mut last_snap: Option<StateSnapshot> = None;
-        while let Some(snap) = player
-            .step_native()
-            .expect("solver-generated replay must stay in sync")
-        {
-            last_snap = Some(snap);
-        }
-
-        let snap = last_snap.expect("winning sequence must contain at least one move");
-        assert!(
-            snap.is_won,
-            "seed {seed}: final snapshot after full replay must have is_won = true \
-             ({} moves applied)",
-            winning_moves.len()
-        );
-        assert_eq!(
-            snap.step_idx,
-            winning_moves.len(),
-            "step_idx after the last move must equal the total move count"
-        );
-        assert!(
-            player
-                .step_native()
-                .expect("winning replay should still be exhausted")
-                .is_none(),
-            "step_native must return None once all moves are exhausted"
-        );
-    }
-}
@@ -0,0 +1,23 @@
+[package]
+name    = "solitaire_web"
+version.workspace = true
+license.workspace = true
+edition.workspace = true
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+solitaire_engine         = { path = "../solitaire_engine" }
+solitaire_data           = { path = "../solitaire_data" }
+# Direct dep so `bevy::` resolves in lib.rs; zero extra features so this
+# contributes nothing to unification with the desktop/Android feature set.
+bevy                     = { workspace = true }
+wasm-bindgen             = "0.2"
+getrandom                = { version = "0.3", features = ["wasm_js"] }
+console_error_panic_hook = "0.1"
+
+# webgl2 must only be enabled for the wasm target — it constrains the
+# renderer to WebGL2 compatibility limits, which is wrong for native builds.
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+bevy = { workspace = true, features = ["webgl2"] }
@@ -0,0 +1,65 @@
+//! Browser entry point for the Ferrous Solitaire Bevy WASM build.
+//!
+//! This crate compiles the full `solitaire_engine` to `wasm32-unknown-unknown`
+//! and renders to a `<canvas id="bevy-canvas">` element. It shares the same
+//! ECS code path as the desktop and Android builds; the only differences are:
+//! - Audio, sync, and analytics plugins are cfg-gated out in `CoreGamePlugin`
+//!   on the wasm32 target (see `solitaire_engine/src/core_game_plugin.rs`).
+//! - `LocalOnlyProvider` is passed as the sync provider (sync is disabled).
+//! - Storage is handled automatically by `WasmStorage` (localStorage-backed),
+//!   wired by `CoreGamePlugin` via `default_storage_backend()`.
+
+use bevy::asset::AssetMetaCheck;
+use bevy::prelude::*;
+use bevy::render::RenderPlugin;
+use bevy::render::settings::{RenderCreation, WgpuSettings, WgpuSettingsPriority};
+use bevy::window::{Window, WindowPlugin};
+use solitaire_data::LocalOnlyProvider;
+use solitaire_engine::CoreGamePlugin;
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen(start)]
+pub fn start() {
+    console_error_panic_hook::set_once();
+
+    App::new()
+        .add_plugins(
+            DefaultPlugins
+                .set(WindowPlugin {
+                    primary_window: Some(Window {
+                        // Bind to the existing <canvas id="bevy-canvas"> in play.html.
+                        // Without this, Bevy appends its own canvas to <body>.
+                        canvas: Some("#bevy-canvas".into()),
+                        // Let CSS size the canvas; Bevy follows the element's size.
+                        fit_canvas_to_parent: true,
+                        // Prevent the browser stealing keyboard events and scroll.
+                        prevent_default_event_handling: true,
+                        ..default()
+                    }),
+                    ..default()
+                })
+                // Bevy's default AssetPlugin fetches a `.meta` sidecar file for
+                // every asset before loading the asset itself. We don't ship
+                // `.meta` files, so skip the check to avoid a flood of 404s.
+                .set(AssetPlugin {
+                    meta_check: AssetMetaCheck::Never,
+                    ..default()
+                })
+                // WebGL2 priority constrains naga (the shader translator) to emit
+                // GLES 300es-compatible GLSL. Without this, Chromium's ANGLE driver
+                // rejects certain shader constructs (storage buffers, tight component
+                // limits) causing a fatal wgpu "Shader translation error". Firefox is
+                // more lenient; this setting makes both browsers work identically.
+                .set(RenderPlugin {
+                    render_creation: RenderCreation::Automatic(WgpuSettings {
+                        priority: WgpuSettingsPriority::WebGL2,
+                        ..default()
+                    }),
+                    ..default()
+                }),
+        )
+        // LocalOnlyProvider disables cloud sync — correct for the web build
+        // since SyncPlugin is cfg-gated out on wasm32 anyway.
+        .add_plugins(CoreGamePlugin::new(Box::new(LocalOnlyProvider)))
+        .run();
+}