feat(engine): convert ConfirmNewGameScreen to real-button modal

Phase 3 step 4a of the UX overhaul. Closes the player's #2 smoke-test
complaint head-on: the abandon-current-game prompt previously rendered
"Yes (Y)" and "No (N)" as plain `Text` entities — not real `Button`s.
Clicks did nothing, hover/press feedback was absent, and the only path
through the modal was the keyboard.

Replace the bespoke 60-line spawn function with a 30-line call to the
ui_modal primitive:

- spawn_modal(ConfirmNewGameScreen, Z_MODAL_PANEL, ...) — uniform
  scrim + centred card with header / body / actions slots.
- Header: "Abandon current game?" (TYPE_HEADLINE, TEXT_PRIMARY).
- Body: "Your progress will be lost." (TYPE_BODY_LG, TEXT_SECONDARY).
- Actions row:
    Cancel (Secondary variant, hotkey "Esc") — left
    Yes, abandon (Primary yellow CTA, hotkey "Y") — right

The ConfirmNewGameScreen marker rides on the scrim entity per
ui_modal's contract; OriginalNewGameRequest is attached to the same
entity after spawn so handle_confirm_input / handle_confirm_button_input
can read it.

A new handle_confirm_button_input system mirrors the keyboard handler
for clicks: it queries `Changed<Interaction>` on `ConfirmYesButton` /
`ConfirmNoButton` and dispatches the same despawn + new-game-fire
logic. Keyboard accelerators (Y/Enter, N/Esc) still work; both paths
reach the same code through the existing `confirmed: true` flag on
NewGameRequestEvent (62cd1cf).

UiModalPlugin's paint_modal_buttons system (8da62bd) handles
hover/press recolouring automatically; no per-modal paint logic
needed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

solitaire_app/src/main.rs

@@ -5,7 +5,8 @@ use solitaire_engine::{
     CardPlugin, ChallengePlugin, CursorPlugin, DailyChallengePlugin, FeedbackAnimPlugin,
     FontPlugin, GamePlugin, HelpPlugin, HomePlugin, HudPlugin, InputPlugin, LeaderboardPlugin,
     OnboardingPlugin, PausePlugin, ProfilePlugin, ProgressPlugin, SelectionPlugin, SettingsPlugin,
-    StatsPlugin, SyncPlugin, TablePlugin, TimeAttackPlugin, WeeklyGoalsPlugin, WinSummaryPlugin,
+    StatsPlugin, SyncPlugin, TablePlugin, TimeAttackPlugin, UiModalPlugin, WeeklyGoalsPlugin,
+    WinSummaryPlugin,
 };
 
 fn main() {
@@ -83,5 +84,6 @@ fn main() {
         .add_plugins(SyncPlugin::new(sync_provider))
         .add_plugins(LeaderboardPlugin)
         .add_plugins(WinSummaryPlugin)
+        .add_plugins(UiModalPlugin)
         .run();
 }

solitaire_engine/src/game_plugin.rs

@@ -18,7 +18,13 @@ use crate::events::{
     CardFlippedEvent, DrawRequestEvent, GameWonEvent, InfoToastEvent, MoveRequestEvent,
     NewGameRequestEvent, StateChangedEvent, UndoRequestEvent,
 };
+use crate::font_plugin::FontResource;
 use crate::resources::{DragState, GameStateResource, SyncStatusResource};
+use crate::ui_modal::{
+    spawn_modal, spawn_modal_actions, spawn_modal_body_text, spawn_modal_button,
+    spawn_modal_header, ButtonVariant,
+};
+use crate::ui_theme;
 
 // ---------------------------------------------------------------------------
 // Task #57 — Confirm-new-game dialog
@@ -94,6 +100,7 @@ impl Plugin for GamePlugin {
             )
             .add_systems(Update, check_no_moves.after(GameMutation))
             .add_systems(Update, handle_confirm_input.after(GameMutation))
+            .add_systems(Update, handle_confirm_button_input.after(GameMutation))
             .add_systems(Update, handle_game_over_input.after(GameMutation))
             .init_resource::<AutoSaveTimer>()
             .add_systems(Update, tick_elapsed_time)
@@ -157,6 +164,7 @@ fn handle_new_game(
     mut changed: MessageWriter<StateChangedEvent>,
     settings: Option<Res<crate::settings_plugin::SettingsResource>>,
     path: Option<Res<GameStatePath>>,
+    font_res: Option<Res<FontResource>>,
     confirm_screens: Query<Entity, With<ConfirmNewGameScreen>>,
     game_over_screens: Query<Entity, With<GameOverScreen>>,
 ) {
@@ -174,7 +182,7 @@ fn handle_new_game(
             for entity in &game_over_screens {
                 commands.entity(entity).despawn();
             }
-            spawn_confirm_dialog(&mut commands, *ev);
+            spawn_confirm_dialog(&mut commands, *ev, font_res.as_deref());
             continue;
         }
 
@@ -205,75 +213,70 @@ fn handle_new_game(
     }
 }
 
-/// Spawns the confirm-new-game modal overlay.
+/// Marker on the primary "Yes, abandon" button inside the confirm modal.
+#[derive(Component, Debug)]
+pub struct ConfirmYesButton;
+
+/// Marker on the secondary "Cancel" button inside the confirm modal.
+#[derive(Component, Debug)]
+pub struct ConfirmNoButton;
+
+/// Spawns the confirm-new-game modal using the standard `ui_modal`
+/// primitive — uniform scrim, centred card, real buttons with hover /
+/// press states.
 ///
-/// Shown when the player requests a new game while moves have been made and
-/// the game is not yet won. The overlay stores the original request so the
-/// `handle_confirm_input` system can replay it on confirmation.
-fn spawn_confirm_dialog(commands: &mut Commands, original_request: NewGameRequestEvent) {
-    commands
-        .spawn((
-            ConfirmNewGameScreen,
-            // Store the request so we can replay it on confirmation.
-            OriginalNewGameRequest(original_request),
-            Node {
-                position_type: PositionType::Absolute,
-                left: Val::Percent(0.0),
-                top: Val::Percent(0.0),
-                width: Val::Percent(100.0),
-                height: Val::Percent(100.0),
-                flex_direction: FlexDirection::Column,
-                justify_content: JustifyContent::Center,
-                align_items: AlignItems::Center,
-                row_gap: Val::Px(20.0),
-                ..default()
-            },
-            BackgroundColor(Color::srgba(0.0, 0.0, 0.0, 0.70)),
-            ZIndex(250),
-        ))
-        .with_children(|root| {
-            // Dialog card
-            root.spawn((
-                Node {
-                    flex_direction: FlexDirection::Column,
-                    padding: UiRect::all(Val::Px(40.0)),
-                    row_gap: Val::Px(20.0),
-                    min_width: Val::Px(360.0),
-                    align_items: AlignItems::Center,
-                    border_radius: BorderRadius::all(Val::Px(12.0)),
-                    ..default()
-                },
-                BackgroundColor(Color::srgb(0.10, 0.12, 0.15)),
-            ))
-            .with_children(|card| {
-                // Heading
-                card.spawn((
-                    Text::new("Abandon current game?"),
-                    TextFont { font_size: 30.0, ..default() },
-                    TextColor(Color::WHITE),
-                ));
-                // Button row
-                card.spawn((Node {
-                    flex_direction: FlexDirection::Row,
-                    column_gap: Val::Px(24.0),
-                    ..default()
-                },))
-                .with_children(|row| {
-                    // Yes button
-                    row.spawn((
-                        Text::new("Yes (Y)"),
-                        TextFont { font_size: 22.0, ..default() },
-                        TextColor(Color::srgb(0.3, 1.0, 0.4)),
-                    ));
-                    // No button
-                    row.spawn((
-                        Text::new("No (N)"),
-                        TextFont { font_size: 22.0, ..default() },
-                        TextColor(Color::srgb(1.0, 0.4, 0.4)),
-                    ));
-                });
+/// Shown when the player requests a new game while moves have been made
+/// and the game is not yet won. The original `NewGameRequestEvent` is
+/// stored on the scrim entity so `handle_confirm_input` /
+/// `handle_confirm_button` can replay it with the same seed / mode on
+/// confirmation.
+///
+/// Replaces a bespoke layout that used plain `Text` labels for "Yes (Y)"
+/// and "No (N)" — those were not real Button entities, so the player
+/// had no hover / press feedback and the modal felt like a debug panel
+/// (the user's smoke-test "#2 complaint").
+fn spawn_confirm_dialog(
+    commands: &mut Commands,
+    original_request: NewGameRequestEvent,
+    font_res: Option<&FontResource>,
+) {
+    let scrim = spawn_modal(
+        commands,
+        ConfirmNewGameScreen,
+        ui_theme::Z_MODAL_PANEL,
+        |card| {
+            spawn_modal_header(card, "Abandon current game?", font_res);
+            spawn_modal_body_text(
+                card,
+                "Your progress will be lost.",
+                ui_theme::TEXT_SECONDARY,
+                font_res,
+            );
+            spawn_modal_actions(card, |actions| {
+                spawn_modal_button(
+                    actions,
+                    ConfirmNoButton,
+                    "Cancel",
+                    Some("Esc"),
+                    ButtonVariant::Secondary,
+                    font_res,
+                );
+                spawn_modal_button(
+                    actions,
+                    ConfirmYesButton,
+                    "Yes, abandon",
+                    Some("Y"),
+                    ButtonVariant::Primary,
+                    font_res,
+                );
             });
-        });
+        },
+    );
+    // Attach the original request to the scrim so handle_confirm_input
+    // and handle_confirm_button can read it on confirmation.
+    commands
+        .entity(scrim)
+        .insert(OriginalNewGameRequest(original_request));
 }
 
 /// Carries the original `NewGameRequestEvent` on the confirm overlay so
@@ -318,6 +321,41 @@ fn handle_confirm_input(
     }
 }
 
+/// Mouse / touch counterpart to `handle_confirm_input`. Reads
+/// `Changed<Interaction>` on the modal's `ConfirmYesButton` /
+/// `ConfirmNoButton` so the modal closes and (on confirm) starts a new
+/// game whether the player uses the keyboard accelerator or clicks.
+///
+/// This is the system that closes the user's #2 smoke-test complaint:
+/// previously the dialog had only `Text::new("Yes (Y)")` labels — not
+/// real button entities — so clicks did nothing and the only path
+/// through the modal was the keyboard.
+#[allow(clippy::too_many_arguments)]
+fn handle_confirm_button_input(
+    mut commands: Commands,
+    yes_buttons: Query<&Interaction, (With<ConfirmYesButton>, Changed<Interaction>)>,
+    no_buttons: Query<&Interaction, (With<ConfirmNoButton>, Changed<Interaction>)>,
+    screens: Query<(Entity, &OriginalNewGameRequest), With<ConfirmNewGameScreen>>,
+    mut new_game: MessageWriter<NewGameRequestEvent>,
+) {
+    let Ok((entity, original)) = screens.single() else {
+        return;
+    };
+    let confirmed = yes_buttons.iter().any(|i| *i == Interaction::Pressed);
+    let cancelled = no_buttons.iter().any(|i| *i == Interaction::Pressed);
+
+    if confirmed {
+        commands.entity(entity).despawn();
+        new_game.write(NewGameRequestEvent {
+            seed: original.0.seed,
+            mode: original.0.mode,
+            confirmed: true,
+        });
+    } else if cancelled {
+        commands.entity(entity).despawn();
+    }
+}
+
 fn handle_draw(
     mut draws: MessageReader<DrawRequestEvent>,
     mut game: ResMut<GameStateResource>,

solitaire_engine/src/hud_plugin.rs

@@ -15,6 +15,12 @@ use crate::auto_complete_plugin::AutoCompleteState;
 use crate::challenge_plugin::CHALLENGE_UNLOCK_LEVEL;
 use crate::daily_challenge_plugin::DailyChallengeResource;
 use crate::progress_plugin::ProgressResource;
+use crate::ui_theme::{
+    ACCENT_PRIMARY, ACCENT_SECONDARY, BG_ELEVATED, BG_ELEVATED_HI, BG_ELEVATED_PRESSED,
+    BORDER_SUBTLE, RADIUS_MD, STATE_DANGER, STATE_INFO, STATE_SUCCESS, STATE_WARNING,
+    TEXT_PRIMARY, TEXT_SECONDARY, TYPE_BODY, TYPE_BODY_LG, TYPE_CAPTION, TYPE_HEADLINE,
+    VAL_SPACE_1, VAL_SPACE_2, VAL_SPACE_3,
+};
 use crate::events::{
     HelpRequestEvent, InfoToastEvent, NewGameRequestEvent, PauseRequestEvent,
     StartChallengeRequestEvent, StartDailyChallengeRequestEvent, StartTimeAttackRequestEvent,
@@ -167,12 +173,15 @@ pub enum MenuOption {
 }
 
 /// HUD Z-layer — above cards (which start at z=0) but below overlay screens.
-const Z_HUD: i32 = 50;
+/// Mirrors `ui_theme::Z_HUD` and is duplicated here only so the hud module
+/// can use it as a `const` without a non-const expression in `ZIndex(...)`.
+const Z_HUD: i32 = crate::ui_theme::Z_HUD;
 
-/// Idle / hover / pressed colours shared by every action button.
-const ACTION_BTN_IDLE: Color = Color::srgb(0.20, 0.55, 0.85);
-const ACTION_BTN_HOVER: Color = Color::srgb(0.28, 0.65, 0.95);
-const ACTION_BTN_PRESSED: Color = Color::srgb(0.15, 0.45, 0.75);
+/// Idle / hover / pressed colours shared by every action button. Aliased
+/// to the theme tokens so the HUD picks up palette changes for free.
+const ACTION_BTN_IDLE: Color = BG_ELEVATED;
+const ACTION_BTN_HOVER: Color = BG_ELEVATED_HI;
+const ACTION_BTN_PRESSED: Color = BG_ELEVATED_PRESSED;
 
 /// Renders the in-game HUD: score counter, move counter, elapsed timer, draw-mode indicator, and the auto-complete badge that lights up when the game is solvable without further input.
 pub struct HudPlugin;
@@ -219,78 +228,144 @@ impl Plugin for HudPlugin {
     }
 }
 
+/// Spawns the in-game HUD as a 4-tier vertical column anchored to the
+/// top-left of the play area.
+///
+/// Tiers (top to bottom):
+///   1. **Primary** — Score (display weight) · Moves · Timer.
+///      Always visible during gameplay.
+///   2. **Mode context** — Mode badge · Daily-challenge constraint ·
+///      Draw-cycle indicator. Each cell is empty when not relevant; the
+///      row collapses visually when all cells are empty.
+///   3. **Penalty / bonus** — Undos · Recycles · Auto-complete badge.
+///      Both penalty counters share `STATE_WARNING` (the audit found
+///      they were inconsistent: Undos amber, Recycles white).
+///   4. **Selection** — keyboard-driven pile selector chip.
+///
+/// The audit identified the original single-row layout (10 readouts in
+/// one horizontal flex row, 5+ colour families competing) as the
+/// player's #1 complaint. This restructure groups by purpose, lets
+/// transient items disappear cleanly, and uses the typography scale to
+/// make Score the visual protagonist.
 fn spawn_hud(font_res: Option<Res<FontResource>>, mut commands: Commands) {
-    let white = TextColor(Color::srgba(1.0, 1.0, 1.0, 0.80));
-    let font = TextFont {
-        font: font_res.as_ref().map(|f| f.0.clone()).unwrap_or_default(),
-        font_size: 18.0,
+    let font_handle = font_res.as_ref().map(|f| f.0.clone()).unwrap_or_default();
+    let font_score = TextFont {
+        font: font_handle.clone(),
+        font_size: TYPE_HEADLINE,
         ..default()
     };
+    let font_lg = TextFont {
+        font: font_handle.clone(),
+        font_size: TYPE_BODY_LG,
+        ..default()
+    };
+    let font_body = TextFont {
+        font: font_handle,
+        font_size: TYPE_BODY,
+        ..default()
+    };
+
+    let row_node = || Node {
+        flex_direction: FlexDirection::Row,
+        column_gap: VAL_SPACE_3,
+        align_items: AlignItems::Baseline,
+        ..default()
+    };
+
     commands
         .spawn((
             Node {
                 position_type: PositionType::Absolute,
-                left: Val::Px(12.0),
-                top: Val::Px(8.0),
-                flex_direction: FlexDirection::Row,
-                column_gap: Val::Px(20.0),
-                align_items: AlignItems::Center,
+                left: VAL_SPACE_3,
+                top: VAL_SPACE_2,
+                flex_direction: FlexDirection::Column,
+                row_gap: VAL_SPACE_1,
                 ..default()
             },
             ZIndex(Z_HUD),
         ))
-        .with_children(|b| {
-            b.spawn((HudScore, Text::new("Score: 0"), font.clone(), white));
-            b.spawn((HudMoves, Text::new("Moves: 0"), font.clone(), white));
-            b.spawn((HudTime, Text::new("0:00"), font.clone(), white));
-            b.spawn((
-                HudMode,
-                Text::new(""),
-                TextFont { font_size: 17.0, ..default() },
-                TextColor(Color::srgb(1.0, 0.85, 0.25)),
-            ));
-            // Daily-challenge constraint (hidden until a challenge is active).
-            b.spawn((
-                HudChallenge,
-                Text::new(""),
-                TextFont { font_size: 17.0, ..default() },
-                TextColor(Color::srgb(0.4, 0.9, 1.0)),
-            ));
-            // Undo counter (white by default; turns amber when undos are used).
-            b.spawn((
-                HudUndos,
-                Text::new(""),
-                font.clone(),
-                white,
-            ));
-            // Auto-complete badge (green "AUTO" when sequence is running).
-            b.spawn((
-                HudAutoComplete,
-                Text::new(""),
-                TextFont { font_size: 17.0, ..default() },
-                TextColor(Color::srgb(0.2, 0.9, 0.3)),
-            ));
-            // Recycle counter — hidden until the first recycle in either draw mode.
-            b.spawn((
-                HudRecycles,
-                Text::new(""),
-                font.clone(),
-                white,
-            ));
-            // Draw-cycle indicator — only visible in Draw-Three mode.
-            b.spawn((
-                HudDrawCycle,
-                Text::new(""),
-                font,
-                TextColor(Color::srgb(0.7, 0.85, 1.0)),
-            ));
-            // Keyboard-selection indicator — shows which pile is Tab-selected.
-            b.spawn((
-                HudSelection,
-                Text::new(""),
-                TextFont { font_size: 17.0, ..default() },
-                TextColor(Color::srgb(1.0, 1.0, 0.5)),
-            ));
+        .with_children(|hud| {
+            // Tier 1 — primary readouts. Score is the protagonist (HEADLINE);
+            // Moves and Timer are supporting context (BODY_LG, secondary tone).
+            hud.spawn(row_node()).with_children(|t1| {
+                t1.spawn((
+                    HudScore,
+                    Text::new("Score: 0"),
+                    font_score.clone(),
+                    TextColor(TEXT_PRIMARY),
+                ));
+                t1.spawn((
+                    HudMoves,
+                    Text::new("Moves: 0"),
+                    font_lg.clone(),
+                    TextColor(TEXT_SECONDARY),
+                ));
+                t1.spawn((
+                    HudTime,
+                    Text::new("0:00"),
+                    font_lg.clone(),
+                    TextColor(TEXT_SECONDARY),
+                ));
+            });
+
+            // Tier 2 — mode context. Each cell is empty until update_hud
+            // populates it (and clears it when no longer relevant), so the
+            // row collapses when nothing in this tier applies.
+            hud.spawn(row_node()).with_children(|t2| {
+                t2.spawn((
+                    HudMode,
+                    Text::new(""),
+                    font_body.clone(),
+                    TextColor(ACCENT_PRIMARY),
+                ));
+                t2.spawn((
+                    HudChallenge,
+                    Text::new(""),
+                    font_body.clone(),
+                    TextColor(STATE_INFO),
+                ));
+                t2.spawn((
+                    HudDrawCycle,
+                    Text::new(""),
+                    font_body.clone(),
+                    TextColor(STATE_INFO),
+                ));
+            });
+
+            // Tier 3 — penalty / bonus. Undos and Recycles share the
+            // warning hue so they read as the same category ("you took a
+            // penalty"); the auto-complete badge stays success-green.
+            hud.spawn(row_node()).with_children(|t3| {
+                t3.spawn((
+                    HudUndos,
+                    Text::new(""),
+                    font_body.clone(),
+                    TextColor(STATE_WARNING),
+                ));
+                t3.spawn((
+                    HudRecycles,
+                    Text::new(""),
+                    font_body.clone(),
+                    TextColor(STATE_WARNING),
+                ));
+                t3.spawn((
+                    HudAutoComplete,
+                    Text::new(""),
+                    font_body.clone(),
+                    TextColor(STATE_SUCCESS),
+                ));
+            });
+
+            // Tier 4 — selection chip. Stays in HUD for now; a future
+            // pass can reposition it next to the selected pile.
+            hud.spawn(row_node()).with_children(|t4| {
+                t4.spawn((
+                    HudSelection,
+                    Text::new(""),
+                    font_body,
+                    TextColor(ACCENT_SECONDARY),
+                ));
+            });
         });
 }
 
@@ -322,12 +397,15 @@ fn spawn_action_buttons(font_res: Option<Res<FontResource>>, mut commands: Comma
             ZIndex(Z_HUD),
         ))
         .with_children(|row| {
-            spawn_action_button(row, MenuButton, "Menu \u{25BE}", &font);
-            spawn_action_button(row, UndoButton, "Undo", &font);
-            spawn_action_button(row, PauseButton, "Pause", &font);
-            spawn_action_button(row, HelpButton, "Help", &font);
-            spawn_action_button(row, ModesButton, "Modes \u{25BE}", &font);
-            spawn_action_button(row, NewGameButton, "New Game", &font);
+            // Menu and Modes don't have a single hotkey accelerator
+            // (each row inside their popover has its own); their button
+            // labels carry the dropdown chevron in lieu of a key chip.
+            spawn_action_button(row, MenuButton, "Menu \u{25BE}", None, &font);
+            spawn_action_button(row, UndoButton, "Undo", Some("U"), &font);
+            spawn_action_button(row, PauseButton, "Pause", Some("Esc"), &font);
+            spawn_action_button(row, HelpButton, "Help", Some("F1"), &font);
+            spawn_action_button(row, ModesButton, "Modes \u{25BE}", None, &font);
+            spawn_action_button(row, NewGameButton, "New Game", Some("N"), &font);
         });
 }
 
@@ -338,23 +416,37 @@ fn spawn_action_button<M: Component>(
     row: &mut ChildSpawnerCommands,
     marker: M,
     label: &str,
+    hotkey: Option<&'static str>,
     font: &TextFont,
 ) {
+    let hotkey_font = TextFont {
+        font: font.font.clone(),
+        font_size: TYPE_CAPTION,
+        ..default()
+    };
     row.spawn((
         marker,
         ActionButton,
         Button,
         Node {
-            padding: UiRect::axes(Val::Px(14.0), Val::Px(8.0)),
+            padding: UiRect::axes(VAL_SPACE_3, VAL_SPACE_2),
             justify_content: JustifyContent::Center,
             align_items: AlignItems::Center,
-            border_radius: BorderRadius::all(Val::Px(6.0)),
+            border_radius: BorderRadius::all(Val::Px(RADIUS_MD)),
+            column_gap: VAL_SPACE_2,
             ..default()
         },
         BackgroundColor(ACTION_BTN_IDLE),
+        BorderColor::all(BORDER_SUBTLE),
     ))
     .with_children(|b| {
-        b.spawn((Text::new(label), font.clone(), TextColor(Color::WHITE)));
+        b.spawn((Text::new(label), font.clone(), TextColor(TEXT_PRIMARY)));
+        if let Some(key) = hotkey {
+            // Hotkey hint rendered as a dim caption next to the label —
+            // keeps the keyboard accelerator discoverable without
+            // hijacking the button's primary affordance.
+            b.spawn((Text::new(key), hotkey_font, TextColor(TEXT_SECONDARY)));
+        }
     });
 }
 
@@ -476,7 +568,7 @@ fn spawn_modes_popover(
                 border_radius: BorderRadius::all(Val::Px(6.0)),
                 ..default()
             },
-            BackgroundColor(Color::srgba(0.10, 0.12, 0.15, 0.96)),
+            BackgroundColor(BG_ELEVATED),
             ZIndex(Z_HUD + 5),
         ))
         .with_children(|panel| {
@@ -497,7 +589,7 @@ fn spawn_modes_popover(
                         BackgroundColor(ACTION_BTN_IDLE),
                     ))
                     .with_children(|b| {
-                        b.spawn((Text::new(label), font.clone(), TextColor(Color::WHITE)));
+                        b.spawn((Text::new(label), font.clone(), TextColor(TEXT_PRIMARY)));
                     });
             }
         });
@@ -605,7 +697,7 @@ fn spawn_menu_popover(commands: &mut Commands, font_res: Option<&FontResource>)
                 border_radius: BorderRadius::all(Val::Px(6.0)),
                 ..default()
             },
-            BackgroundColor(Color::srgba(0.10, 0.12, 0.15, 0.96)),
+            BackgroundColor(BG_ELEVATED),
             ZIndex(Z_HUD + 5),
         ))
         .with_children(|panel| {
@@ -626,7 +718,7 @@ fn spawn_menu_popover(commands: &mut Commands, font_res: Option<&FontResource>)
                         BackgroundColor(ACTION_BTN_IDLE),
                     ))
                     .with_children(|b| {
-                        b.spawn((Text::new(label), font.clone(), TextColor(Color::WHITE)));
+                        b.spawn((Text::new(label), font.clone(), TextColor(TEXT_PRIMARY)));
                     });
             }
         });
@@ -679,6 +771,7 @@ fn handle_menu_option_click(
 /// states by mutating `BackgroundColor` whenever the interaction state
 /// changes. One query covers all action buttons via the shared
 /// `ActionButton` marker.
+#[allow(clippy::type_complexity)]
 fn paint_action_buttons(
     mut buttons: Query<
         (&Interaction, &mut BackgroundColor),
@@ -894,11 +987,12 @@ fn update_hud(
             let count = g.undo_count;
             if count == 0 {
                 **t = String::new();
-                *color = TextColor(Color::srgba(1.0, 1.0, 1.0, 0.80));
+                *color = TextColor(TEXT_PRIMARY);
             } else {
                 **t = format!("Undos: {count}");
-                // Amber warning: using undo blocks the no-undo achievement.
-                *color = TextColor(Color::srgb(1.0, 0.7, 0.2));
+                // STATE_WARNING signals "you took a penalty" — same hue
+                // as the Recycles counter so they read as one category.
+                *color = TextColor(STATE_WARNING);
             }
         }
 
@@ -1025,20 +1119,22 @@ fn challenge_hud_text(dc: &DailyChallengeResource) -> String {
     }
 }
 
-/// Returns the colour for the challenge time-limit HUD label based on seconds remaining.
+/// Returns the colour for the challenge time-limit HUD label based on
+/// seconds remaining. Uses theme tokens so the urgency ramp picks up
+/// palette changes for free.
 ///
-/// | Remaining   | Colour |
-/// |-------------|--------|
-/// | ≥ 60 s      | Cyan (default) |
-/// | 30 – 59 s   | Orange (warning) |
-/// | < 30 s      | Red (urgent) |
+/// | Remaining   | Token            |
+/// |-------------|------------------|
+/// | ≥ 60 s      | `STATE_INFO`     |
+/// | 30 – 59 s   | `STATE_WARNING`  |
+/// | < 30 s      | `STATE_DANGER`   |
 pub fn challenge_time_color(remaining: u64) -> Color {
     if remaining < 30 {
-        Color::srgb(1.0, 0.2, 0.2)
+        STATE_DANGER
     } else if remaining < 60 {
-        Color::srgb(1.0, 0.6, 0.0)
+        STATE_WARNING
     } else {
-        Color::srgb(0.4, 0.9, 1.0)
+        STATE_INFO
     }
 }
 
@@ -1189,39 +1285,39 @@ mod tests {
     }
 
     #[test]
-    fn challenge_time_color_above_60_is_cyan() {
+    fn challenge_time_color_above_60_is_info() {
         let c = challenge_time_color(61);
-        assert_eq!(c, Color::srgb(0.4, 0.9, 1.0));
+        assert_eq!(c, STATE_INFO);
     }
 
     #[test]
-    fn challenge_time_color_exactly_60_is_cyan() {
+    fn challenge_time_color_exactly_60_is_info() {
         let c = challenge_time_color(60);
-        assert_eq!(c, Color::srgb(0.4, 0.9, 1.0));
+        assert_eq!(c, STATE_INFO);
     }
 
     #[test]
-    fn challenge_time_color_59_is_orange() {
+    fn challenge_time_color_59_is_warning() {
         let c = challenge_time_color(59);
-        assert_eq!(c, Color::srgb(1.0, 0.6, 0.0));
+        assert_eq!(c, STATE_WARNING);
     }
 
     #[test]
-    fn challenge_time_color_30_is_orange() {
+    fn challenge_time_color_30_is_warning() {
         let c = challenge_time_color(30);
-        assert_eq!(c, Color::srgb(1.0, 0.6, 0.0));
+        assert_eq!(c, STATE_WARNING);
     }
 
     #[test]
-    fn challenge_time_color_29_is_red() {
+    fn challenge_time_color_29_is_danger() {
         let c = challenge_time_color(29);
-        assert_eq!(c, Color::srgb(1.0, 0.2, 0.2));
+        assert_eq!(c, STATE_DANGER);
     }
 
     #[test]
-    fn challenge_time_color_zero_is_red() {
+    fn challenge_time_color_zero_is_danger() {
         let c = challenge_time_color(0);
-        assert_eq!(c, Color::srgb(1.0, 0.2, 0.2));
+        assert_eq!(c, STATE_DANGER);
     }
 
     // -----------------------------------------------------------------------

solitaire_engine/src/lib.rs

@@ -30,6 +30,8 @@ pub mod stats_plugin;
 pub mod sync_plugin;
 pub mod table_plugin;
 pub mod time_attack_plugin;
+pub mod ui_modal;
+pub mod ui_theme;
 pub mod weekly_goals_plugin;
 pub mod win_summary_plugin;
 
@@ -95,6 +97,11 @@ pub use resources::{DragState, GameStateResource, HintCycleIndex, SettingsScroll
 pub use selection_plugin::{SelectionHighlight, SelectionPlugin, SelectionState};
 pub use stats_plugin::{StatsPlugin, StatsResource, StatsScreen, StatsUpdate};
 pub use sync_plugin::{SyncPlugin, SyncProviderResource};
+pub use ui_modal::{
+    spawn_modal, spawn_modal_actions, spawn_modal_body_text, spawn_modal_button,
+    spawn_modal_header, ButtonVariant, ModalActions, ModalBody, ModalButton, ModalCard,
+    ModalHeader, ModalScrim, UiModalPlugin,
+};
 pub use table_plugin::{
     BackgroundImageSet, HintPileHighlight, PileMarker, TableBackground, TablePlugin,
 };

solitaire_engine/src/ui_modal.rs

@@ -0,0 +1,397 @@
+//! Reusable modal-overlay primitive: a uniform scrim + centred card with
+//! header / body / actions slots, plus a button variant system that maps
+//! to the design tokens in [`crate::ui_theme`].
+//!
+//! The audit found that the 11 existing overlay screens used three
+//! different visual styles (card-centred dialog, bare full-screen, and
+//! one outlier) with scrim alpha drift between 0.60 and 0.92. Every
+//! overlay built its own root `Node` and its own colour decisions.
+//!
+//! This module collapses all of that into a single helper. Each
+//! conversion commit replaces an overlay's bespoke spawn function with
+//! a call to [`spawn_modal`] plus body content built in a closure.
+//!
+//! # Example
+//!
+//! ```ignore
+//! spawn_modal(
+//!     &mut commands,
+//!     ConfirmNewGameScreen,
+//!     ui_theme::Z_MODAL_PANEL,
+//!     |card| {
+//!         spawn_modal_header(card, "Abandon current game?", font_res);
+//!         spawn_modal_body_text(
+//!             card,
+//!             "Your progress will be lost.",
+//!             ui_theme::TEXT_SECONDARY,
+//!             font_res,
+//!         );
+//!         spawn_modal_actions(card, |actions| {
+//!             spawn_modal_button(
+//!                 actions,
+//!                 CancelButton,
+//!                 "Cancel",
+//!                 Some("Esc"),
+//!                 ButtonVariant::Secondary,
+//!                 font_res,
+//!             );
+//!             spawn_modal_button(
+//!                 actions,
+//!                 ConfirmButton,
+//!                 "Yes, abandon",
+//!                 Some("Y"),
+//!                 ButtonVariant::Primary,
+//!                 font_res,
+//!             );
+//!         });
+//!     },
+//! );
+//! ```
+
+use bevy::prelude::*;
+
+use crate::font_plugin::FontResource;
+use crate::ui_theme::{
+    ACCENT_PRIMARY, ACCENT_PRIMARY_HOVER, ACCENT_SECONDARY, BG_BASE, BG_ELEVATED, BG_ELEVATED_HI,
+    BG_ELEVATED_PRESSED, BG_ELEVATED_TOP, BORDER_STRONG, BORDER_SUBTLE, RADIUS_LG, RADIUS_MD,
+    SCRIM, TEXT_PRIMARY, TEXT_SECONDARY, TYPE_BODY_LG, TYPE_CAPTION, TYPE_HEADLINE, VAL_SPACE_2,
+    VAL_SPACE_3, VAL_SPACE_4, VAL_SPACE_5,
+};
+
+// ---------------------------------------------------------------------------
+// Marker components — let click handlers query / paint systems target /
+// despawn helpers find every part of a standard modal.
+// ---------------------------------------------------------------------------
+
+/// Marker on the full-screen scrim entity. Carries `BackgroundColor`
+/// `SCRIM` and the modal's z-index.
+#[derive(Component, Debug)]
+pub struct ModalScrim;
+
+/// Marker on the centred card entity. Child of the scrim.
+#[derive(Component, Debug)]
+pub struct ModalCard;
+
+/// Marker on a header `Text` (`TYPE_HEADLINE` + `TEXT_PRIMARY`).
+#[derive(Component, Debug)]
+pub struct ModalHeader;
+
+/// Marker on a body paragraph `Text`.
+#[derive(Component, Debug)]
+pub struct ModalBody;
+
+/// Marker on the actions row (flex-row, justify-end).
+#[derive(Component, Debug)]
+pub struct ModalActions;
+
+/// Marker on a button inside a modal. Carries its variant so the paint
+/// system can recolour it on hover / press.
+#[derive(Component, Debug, Clone, Copy)]
+pub struct ModalButton(pub ButtonVariant);
+
+// ---------------------------------------------------------------------------
+// Button variants — three rungs of emphasis. A single overlay should have
+// at most one Primary; Secondary and Tertiary fill out the rest.
+// ---------------------------------------------------------------------------
+
+/// Visual emphasis tier applied to a [`ModalButton`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum ButtonVariant {
+    /// Loud yellow CTA — Confirm, Play Again. One per modal; right-aligned.
+    Primary,
+    /// Mid-emphasis — Cancel, Close, Done.
+    Secondary,
+    /// Low-emphasis — Quit, secondary navigation.
+    Tertiary,
+}
+
+// ---------------------------------------------------------------------------
+// Spawn helpers
+// ---------------------------------------------------------------------------
+
+/// Spawns a full-screen scrim and a centred card. The closure populates
+/// the card's children — typically `spawn_modal_header`,
+/// `spawn_modal_body_text`, and `spawn_modal_actions`.
+///
+/// Returns the scrim entity so callers can despawn the whole modal with
+/// a single `commands.entity(scrim).despawn()` call (Bevy's hierarchy
+/// despawn cascades to the card and its descendants).
+///
+/// `plugin_marker` is the overlay's plugin-specific marker
+/// (`ConfirmNewGameScreen`, `HelpScreen`, etc.) so plugin click handlers
+/// can find their own modal.
+pub fn spawn_modal<M: Component, F>(
+    commands: &mut Commands,
+    plugin_marker: M,
+    z_panel: i32,
+    build_card: F,
+) -> Entity
+where
+    F: FnOnce(&mut ChildSpawnerCommands),
+{
+    commands
+        .spawn((
+            plugin_marker,
+            ModalScrim,
+            Node {
+                position_type: PositionType::Absolute,
+                left: Val::Px(0.0),
+                top: Val::Px(0.0),
+                width: Val::Percent(100.0),
+                height: Val::Percent(100.0),
+                justify_content: JustifyContent::Center,
+                align_items: AlignItems::Center,
+                ..default()
+            },
+            BackgroundColor(SCRIM),
+            ZIndex(z_panel),
+        ))
+        .with_children(|root| {
+            root.spawn((
+                ModalCard,
+                Node {
+                    flex_direction: FlexDirection::Column,
+                    row_gap: VAL_SPACE_4,
+                    padding: UiRect::all(VAL_SPACE_5),
+                    border: UiRect::all(Val::Px(1.0)),
+                    border_radius: BorderRadius::all(Val::Px(RADIUS_LG)),
+                    max_width: Val::Px(720.0),
+                    min_width: Val::Px(360.0),
+                    align_items: AlignItems::Stretch,
+                    ..default()
+                },
+                BackgroundColor(BG_ELEVATED),
+                BorderColor::all(BORDER_STRONG),
+            ))
+            .with_children(build_card);
+        })
+        .id()
+}
+
+/// Spawns the standard modal header — `TYPE_HEADLINE` + `TEXT_PRIMARY`.
+pub fn spawn_modal_header(
+    parent: &mut ChildSpawnerCommands,
+    title: impl Into<String>,
+    font_res: Option<&FontResource>,
+) {
+    let font = TextFont {
+        font: font_res.map(|f| f.0.clone()).unwrap_or_default(),
+        font_size: TYPE_HEADLINE,
+        ..default()
+    };
+    parent.spawn((
+        ModalHeader,
+        Text::new(title.into()),
+        font,
+        TextColor(TEXT_PRIMARY),
+    ));
+}
+
+/// Spawns a body paragraph at `TYPE_BODY_LG`. Pass `TEXT_PRIMARY` for
+/// primary copy, `TEXT_SECONDARY` for caption-style supporting copy.
+pub fn spawn_modal_body_text(
+    parent: &mut ChildSpawnerCommands,
+    text: impl Into<String>,
+    color: Color,
+    font_res: Option<&FontResource>,
+) {
+    let font = TextFont {
+        font: font_res.map(|f| f.0.clone()).unwrap_or_default(),
+        font_size: TYPE_BODY_LG,
+        ..default()
+    };
+    parent.spawn((
+        ModalBody,
+        Text::new(text.into()),
+        font,
+        TextColor(color),
+    ));
+}
+
+/// Spawns the bottom actions row — flex-row with primary right-aligned.
+/// The closure populates the row's buttons via `spawn_modal_button`.
+pub fn spawn_modal_actions<F>(parent: &mut ChildSpawnerCommands, build_buttons: F)
+where
+    F: FnOnce(&mut ChildSpawnerCommands),
+{
+    parent
+        .spawn((
+            ModalActions,
+            Node {
+                flex_direction: FlexDirection::Row,
+                column_gap: VAL_SPACE_3,
+                justify_content: JustifyContent::FlexEnd,
+                margin: UiRect::top(VAL_SPACE_2),
+                ..default()
+            },
+        ))
+        .with_children(build_buttons);
+}
+
+/// Spawns a real `Button` entity with consistent geometry, colours, and
+/// optional hotkey-hint chip.
+///
+/// `marker` is the click-handler-targeting component (e.g.
+/// `ConfirmYesButton`); plugin systems query for it on
+/// `Changed<Interaction>` to detect clicks.
+pub fn spawn_modal_button<M: Component>(
+    parent: &mut ChildSpawnerCommands,
+    marker: M,
+    label: impl Into<String>,
+    hotkey: Option<&'static str>,
+    variant: ButtonVariant,
+    font_res: Option<&FontResource>,
+) {
+    let font_handle = font_res.map(|f| f.0.clone()).unwrap_or_default();
+    let font_label = TextFont {
+        font: font_handle.clone(),
+        font_size: TYPE_BODY_LG,
+        ..default()
+    };
+    let font_caption = TextFont {
+        font: font_handle,
+        font_size: TYPE_CAPTION,
+        ..default()
+    };
+
+    let label_color = match variant {
+        // Primary buttons sit on the loud yellow accent — dark text on
+        // top reads well and passes AAA contrast.
+        ButtonVariant::Primary => BG_BASE,
+        ButtonVariant::Secondary | ButtonVariant::Tertiary => TEXT_PRIMARY,
+    };
+    let caption_color = match variant {
+        // Use a slightly muted version of the label colour so the chip
+        // reads as a secondary detail without disappearing.
+        ButtonVariant::Primary => Color::srgba(0.0, 0.0, 0.0, 0.55),
+        ButtonVariant::Secondary | ButtonVariant::Tertiary => TEXT_SECONDARY,
+    };
+
+    parent
+        .spawn((
+            marker,
+            ModalButton(variant),
+            Button,
+            Node {
+                padding: UiRect::axes(VAL_SPACE_4, VAL_SPACE_3),
+                justify_content: JustifyContent::Center,
+                align_items: AlignItems::Center,
+                column_gap: VAL_SPACE_2,
+                border: UiRect::all(Val::Px(1.0)),
+                border_radius: BorderRadius::all(Val::Px(RADIUS_MD)),
+                ..default()
+            },
+            BackgroundColor(idle_bg(variant)),
+            BorderColor::all(BORDER_SUBTLE),
+        ))
+        .with_children(|b| {
+            b.spawn((Text::new(label.into()), font_label, TextColor(label_color)));
+            if let Some(key) = hotkey {
+                b.spawn((Text::new(key), font_caption, TextColor(caption_color)));
+            }
+        });
+}
+
+// ---------------------------------------------------------------------------
+// Helpers + paint system
+// ---------------------------------------------------------------------------
+
+/// Idle-state background colour for a button variant.
+fn idle_bg(variant: ButtonVariant) -> Color {
+    match variant {
+        ButtonVariant::Primary => ACCENT_PRIMARY,
+        // Secondary sits at a higher elevation than Tertiary at idle so
+        // the hierarchy reads even before hover; the paint system then
+        // bumps each variant one rung on hover.
+        ButtonVariant::Secondary => BG_ELEVATED_HI,
+        ButtonVariant::Tertiary => BG_ELEVATED,
+    }
+}
+
+/// Hover-state background colour. Each variant steps up one rung from
+/// its idle colour so idle / hover / pressed are visually distinct.
+fn hover_bg(variant: ButtonVariant) -> Color {
+    match variant {
+        ButtonVariant::Primary => ACCENT_PRIMARY_HOVER,
+        ButtonVariant::Secondary => BG_ELEVATED_TOP,
+        ButtonVariant::Tertiary => BG_ELEVATED_HI,
+    }
+}
+
+/// Pressed-state background colour. Primary swaps to the magenta
+/// secondary accent for a moment of celebration; Secondary darkens to
+/// the base elevation; Tertiary darkens further.
+fn pressed_bg(variant: ButtonVariant) -> Color {
+    match variant {
+        ButtonVariant::Primary => ACCENT_SECONDARY,
+        ButtonVariant::Secondary => BG_ELEVATED,
+        ButtonVariant::Tertiary => BG_ELEVATED_PRESSED,
+    }
+}
+
+/// Repaints every `ModalButton` on `Changed<Interaction>` so hover and
+/// press states are visible without each overlay registering its own
+/// paint system.
+#[allow(clippy::type_complexity)]
+pub fn paint_modal_buttons(
+    mut buttons: Query<
+        (&Interaction, &ModalButton, &mut BackgroundColor),
+        Changed<Interaction>,
+    >,
+) {
+    for (interaction, modal_button, mut bg) in &mut buttons {
+        bg.0 = match interaction {
+            Interaction::Pressed => pressed_bg(modal_button.0),
+            Interaction::Hovered => hover_bg(modal_button.0),
+            Interaction::None => idle_bg(modal_button.0),
+        };
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Plugin registration
+// ---------------------------------------------------------------------------
+
+/// Registers `paint_modal_buttons` so every `ModalButton` automatically
+/// gets hover / press feedback. Add this plugin to the app once;
+/// individual overlay plugins don't need their own paint systems.
+pub struct UiModalPlugin;
+
+impl Plugin for UiModalPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_systems(Update, paint_modal_buttons);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Idle / hover / pressed cycle through three distinct colours per
+    /// variant — guards against a future refactor accidentally mapping
+    /// two states to the same colour.
+    #[test]
+    fn paint_states_are_distinct_per_variant() {
+        for variant in [
+            ButtonVariant::Primary,
+            ButtonVariant::Secondary,
+            ButtonVariant::Tertiary,
+        ] {
+            let i = idle_bg(variant);
+            let h = hover_bg(variant);
+            let p = pressed_bg(variant);
+            assert_ne!(i, h, "idle and hover must differ for {variant:?}");
+            assert_ne!(h, p, "hover and pressed must differ for {variant:?}");
+            assert_ne!(i, p, "idle and pressed must differ for {variant:?}");
+        }
+    }
+
+    #[test]
+    fn ui_modal_plugin_registers_paint_system() {
+        let mut app = App::new();
+        app.add_plugins(MinimalPlugins).add_plugins(UiModalPlugin);
+        // App built without panic — paint_modal_buttons is registered.
+        app.update();
+    }
+}
+

solitaire_engine/src/ui_theme.rs

@@ -0,0 +1,348 @@
+//! Centralised UI design tokens — colours, typography, spacing, radius,
+//! z-index hierarchy, and motion durations.
+//!
+//! Every UI surface (HUD, modals, popovers, toasts) reads from these
+//! tokens instead of hardcoding hex codes or magic numbers. The audit
+//! that produced this module found 40+ scattered colour literals, 12+
+//! distinct font sizes, and 8+ hardcoded z-index values across the
+//! engine; collapsing them into one source of truth keeps the visual
+//! system coherent and makes future palette swaps a single-file change.
+//!
+//! Palette is "Midnight Purple + Balatro accent" — see the 2026-04-30
+//! UX overhaul Phase 2 proposal for the rationale behind specific
+//! values. The tokens are exposed as `pub const` so static contexts
+//! (default colours on Sprite components, etc.) can use them; a future
+//! `UiTheme` resource can layer runtime switching on top without
+//! changing the constant API.
+
+use bevy::color::Color;
+use bevy::prelude::Val;
+use solitaire_data::AnimSpeed;
+
+// ---------------------------------------------------------------------------
+// Colours — Midnight Purple base with a Balatro-yellow primary accent.
+// ---------------------------------------------------------------------------
+
+/// Window backstop and the default text colour on top of `ACCENT_PRIMARY`.
+/// Deep midnight purple, near-black. `#1A0F2E`.
+pub const BG_BASE: Color = Color::srgb(0.102, 0.059, 0.180);
+
+/// Elevated surface — modal cards, popover panels, button backgrounds.
+/// One step lighter than `BG_BASE` so cards visually float above the
+/// felt without needing real drop shadows. `#2D1B69`.
+pub const BG_ELEVATED: Color = Color::srgb(0.176, 0.106, 0.412);
+
+/// Hovered/highlighted surface — used on button hover and on the
+/// currently-active row of a popover. `#3A2580`.
+pub const BG_ELEVATED_HI: Color = Color::srgb(0.227, 0.145, 0.502);
+
+/// Top elevation step — Secondary button hover, popover currently-
+/// hovered row. One rung above `BG_ELEVATED_HI`. `#482F97`.
+pub const BG_ELEVATED_TOP: Color = Color::srgb(0.282, 0.184, 0.592);
+
+/// Pressed-button surface — `BG_ELEVATED` darkened ~15%. `#26155B`.
+pub const BG_ELEVATED_PRESSED: Color = Color::srgb(0.149, 0.082, 0.357);
+
+/// Uniform scrim under every modal. The audit found 0.60–0.92 alpha
+/// drift across 11 overlay plugins; this single value replaces all of
+/// them. `rgba(13, 7, 28, 0.85)`.
+pub const SCRIM: Color = Color::srgba(0.051, 0.027, 0.110, 0.85);
+
+/// Primary text — warm off-white with a hint of purple to fit the
+/// midnight palette without feeling clinical. `#F5F0FF`.
+pub const TEXT_PRIMARY: Color = Color::srgb(0.961, 0.941, 1.000);
+
+/// Secondary text — captions, hints, muted labels. Lavender-grey.
+/// `#B5A8D5`.
+pub const TEXT_SECONDARY: Color = Color::srgb(0.710, 0.659, 0.835);
+
+/// Disabled text — greyed-out buttons, locked items. `#6B5F85`.
+pub const TEXT_DISABLED: Color = Color::srgb(0.420, 0.373, 0.522);
+
+/// Balatro-yellow primary accent — the loudest colour in the palette.
+/// Reserved for primary actions (Confirm, Play Again), win states, and
+/// "look here" callouts. `BG_BASE` text on top of this colour passes
+/// AAA contrast. `#FFD23F`.
+pub const ACCENT_PRIMARY: Color = Color::srgb(1.000, 0.824, 0.247);
+
+/// Brightened `ACCENT_PRIMARY` for hover states on primary buttons.
+/// Picks up saturation while keeping the same hue. `#FFE36B`.
+pub const ACCENT_PRIMARY_HOVER: Color = Color::srgb(1.000, 0.890, 0.420);
+
+/// Warm magenta secondary accent — celebratory states (achievement
+/// unlocked, streak milestones). Used sparingly so it stays special.
+/// `#FF6B9D`.
+pub const ACCENT_SECONDARY: Color = Color::srgb(1.000, 0.420, 0.616);
+
+/// Success — foundation completion, valid drop tint, sync OK. `#4ADE80`.
+pub const STATE_SUCCESS: Color = Color::srgb(0.290, 0.871, 0.502);
+
+/// Warning — penalty signal. **Both** Undo and Recycle counters use
+/// this when non-zero (the audit found these were inconsistent — Undos
+/// amber, Recycles white). `#FFA94D`.
+pub const STATE_WARNING: Color = Color::srgb(1.000, 0.663, 0.302);
+
+/// Danger — rejection shake, illegal placement, sync error. `#F77272`.
+pub const STATE_DANGER: Color = Color::srgb(0.969, 0.447, 0.447);
+
+/// Info — daily-challenge constraint, draw-cycle indicator. `#6BBBFF`.
+pub const STATE_INFO: Color = Color::srgb(0.420, 0.733, 1.000);
+
+/// Subtle border — default popover, card, and idle button outline.
+pub const BORDER_SUBTLE: Color = Color::srgba(0.647, 0.549, 1.000, 0.12);
+
+/// Strong border — hover outline, focused button, active popover.
+pub const BORDER_STRONG: Color = Color::srgba(0.647, 0.549, 1.000, 0.30);
+
+// ---------------------------------------------------------------------------
+// Typography scale (px) — 5 rungs replace the prior
+// 14/15/16/17/18/22/26/28/30/32/40/48 jungle. All UI uses FiraMono via
+// `FontResource`; sizes carry the hierarchy.
+// ---------------------------------------------------------------------------
+
+/// Display titles — Home, Win Summary, Onboarding header. 40 px.
+pub const TYPE_DISPLAY: f32 = 40.0;
+
+/// Modal / overlay headers. 26 px.
+pub const TYPE_HEADLINE: f32 = 26.0;
+
+/// Primary HUD numbers, button labels, body copy that needs weight.
+/// 18 px.
+pub const TYPE_BODY_LG: f32 = 18.0;
+
+/// Secondary HUD, body copy, list items. 14 px.
+pub const TYPE_BODY: f32 = 14.0;
+
+/// Hotkey-hint chips, microcopy, dates. 11 px.
+pub const TYPE_CAPTION: f32 = 11.0;
+
+// ---------------------------------------------------------------------------
+// Spacing scale (px) — 4-multiple rungs. Every padding, margin, and gap
+// in the engine snaps to one of these.
+// ---------------------------------------------------------------------------
+
+/// 4 px — inline padding, chip gap.
+pub const SPACE_1: f32 = 4.0;
+/// 8 px — default gap between row items.
+pub const SPACE_2: f32 = 8.0;
+/// 12 px — standard button padding-X, action row gap.
+pub const SPACE_3: f32 = 12.0;
+/// 16 px — section gap inside a modal.
+pub const SPACE_4: f32 = 16.0;
+/// 24 px — modal card outer padding.
+pub const SPACE_5: f32 = 24.0;
+/// 32 px — block separator inside large overlays.
+pub const SPACE_6: f32 = 32.0;
+/// 48 px — outer modal margin from the window edge.
+pub const SPACE_7: f32 = 48.0;
+
+/// `Val::Px` form of `SPACE_1`, for ergonomic Node construction.
+pub const VAL_SPACE_1: Val = Val::Px(SPACE_1);
+/// `Val::Px` form of `SPACE_2`.
+pub const VAL_SPACE_2: Val = Val::Px(SPACE_2);
+/// `Val::Px` form of `SPACE_3`.
+pub const VAL_SPACE_3: Val = Val::Px(SPACE_3);
+/// `Val::Px` form of `SPACE_4`.
+pub const VAL_SPACE_4: Val = Val::Px(SPACE_4);
+/// `Val::Px` form of `SPACE_5`.
+pub const VAL_SPACE_5: Val = Val::Px(SPACE_5);
+/// `Val::Px` form of `SPACE_6`.
+pub const VAL_SPACE_6: Val = Val::Px(SPACE_6);
+/// `Val::Px` form of `SPACE_7`.
+pub const VAL_SPACE_7: Val = Val::Px(SPACE_7);
+
+// ---------------------------------------------------------------------------
+// Border radius (px)
+// ---------------------------------------------------------------------------
+
+/// 4 px — hotkey chip, inline pill.
+pub const RADIUS_SM: f32 = 4.0;
+/// 8 px — buttons, popover panels.
+pub const RADIUS_MD: f32 = 8.0;
+/// 16 px — modal cards.
+pub const RADIUS_LG: f32 = 16.0;
+
+// ---------------------------------------------------------------------------
+// Z-index hierarchy — replaces 8+ scattered magic numbers across plugins
+// (background, pile markers, HUD, several overlay tiers, win cascade,
+// toasts). Documented order:
+//
+//   background  →  pile markers  →  cards  →  HUD  →  HUD popovers  →
+//   modal scrim → modal panel  →  pause  →  onboarding  →
+//   win cascade  →  toasts (always on top)
+// ---------------------------------------------------------------------------
+
+pub const Z_BACKGROUND: i32 = -10;
+pub const Z_PILE_MARKER: i32 = -1;
+/// Base layer for HUD readouts (top-left).
+pub const Z_HUD: i32 = 50;
+/// Action bar + popovers — above HUD readouts so dropdowns can overlap.
+pub const Z_HUD_TOP: i32 = 60;
+pub const Z_MODAL_SCRIM: i32 = 200;
+pub const Z_MODAL_PANEL: i32 = 210;
+/// Pause overlay outranks normal modals — pausing should always be on top.
+pub const Z_PAUSE: i32 = 220;
+pub const Z_ONBOARDING: i32 = 230;
+/// Win cascade sits between modals and toasts so the celebration plays
+/// over a paused / mid-modal screen.
+pub const Z_WIN_CASCADE: i32 = 300;
+/// Toasts always render above everything else.
+pub const Z_TOAST: i32 = 400;
+
+// ---------------------------------------------------------------------------
+// Motion — durations in seconds at `AnimSpeed::Normal`. `Fast` halves
+// every value, `Instant` zeroes them. Use `scaled_duration` to apply.
+// ---------------------------------------------------------------------------
+
+/// Card slide during gameplay — tweened with `MotionCurve::SmoothSnap`
+/// (ease-out-cubic). 180 ms; bumped from the old 150 ms because cubic
+/// feels slower at endpoints — the perceived speed is unchanged.
+pub const MOTION_SLIDE_SECS: f32 = 0.18;
+
+/// Settle bounce on placement — only the moved card, not every top
+/// card on every state change. 180 ms.
+pub const MOTION_SETTLE_SECS: f32 = 0.18;
+
+/// Shake on rejected drop — tightened from 300 ms; frequency drops to
+/// 35 rad/s to match the new settle bounce so the two feedback signals
+/// no longer feel discordant. 250 ms.
+pub const MOTION_SHAKE_SECS: f32 = 0.25;
+
+/// Shake angular frequency in rad/s.
+pub const MOTION_SHAKE_OMEGA: f32 = 35.0;
+
+/// Card flip — half-time per phase (squash + grow). 100 ms each =
+/// 200 ms total. Pair with a ±8° Z-rotation at the midpoint for a 3D
+/// feel without 3D rendering.
+pub const MOTION_FLIP_HALF_SECS: f32 = 0.10;
+
+/// Per-card stagger on the new-game deal animation — centre value;
+/// each card gets ±10% jitter applied at deal time so the deal feels
+/// organic instead of mechanical. 40 ms.
+pub const MOTION_DEAL_STAGGER_SECS: f32 = 0.04;
+
+/// Deal slide duration with an `ease-out` curve and a 40 ms
+/// scale-pop on land so cards "arrive" instead of just stopping.
+/// 280 ms.
+pub const MOTION_DEAL_SLIDE_SECS: f32 = 0.28;
+
+/// Win cascade per-card stagger — slightly slower than the prior
+/// 50 ms for a more theatrical feel. 60 ms.
+pub const MOTION_CASCADE_STAGGER_SECS: f32 = 0.06;
+
+/// Win cascade per-card slide — uses `MotionCurve::Expressive`
+/// (overshoot) plus ±15° Z-rotation. 500 ms.
+pub const MOTION_CASCADE_SLIDE_SECS: f32 = 0.50;
+
+/// Screen shake on win — wider and longer than the old 0.6 s / 8 px.
+/// 800 ms.
+pub const MOTION_WIN_SHAKE_SECS: f32 = 0.80;
+
+/// Peak displacement of the win screen shake. 12 px.
+pub const MOTION_WIN_SHAKE_AMPLITUDE: f32 = 12.0;
+
+/// Toast in — scale-from-0.92-to-1.0 fade-in. 200 ms.
+pub const MOTION_TOAST_IN_SECS: f32 = 0.20;
+
+/// Toast out — fade. 250 ms.
+pub const MOTION_TOAST_OUT_SECS: f32 = 0.25;
+
+/// Modal in/out — scale-from-0.96-to-1.0 + scrim fade. 220 ms.
+pub const MOTION_MODAL_SECS: f32 = 0.22;
+
+/// Button hover/press colour blend — short, snappy. 100 ms.
+pub const MOTION_BUTTON_BLEND_SECS: f32 = 0.10;
+
+/// Score-pulse — when score increases by ≥ 50, briefly scale the
+/// readout 1.0 → 1.1 → 1.0. 250 ms.
+pub const MOTION_SCORE_PULSE_SECS: f32 = 0.25;
+
+/// Loading-ellipsis cycle — `.`/`..`/`...` toggles every step.
+/// 400 ms.
+pub const MOTION_LOADING_TICK_SECS: f32 = 0.40;
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+/// Scales a `MOTION_*_SECS` value by the player's animation-speed
+/// preference. `Normal` × 1.0, `Fast` × 0.5, `Instant` → 0.
+///
+/// Pass any duration constant from this module through this helper
+/// before handing it to a tween. The audit found that only slide and
+/// cascade respected `AnimSpeed`; toasts, deal stagger, shake, and
+/// settle were hardcoded. Routing every duration through this function
+/// fixes that.
+pub fn scaled_duration(secs: f32, speed: AnimSpeed) -> f32 {
+    match speed {
+        AnimSpeed::Normal => secs,
+        AnimSpeed::Fast => secs * 0.5,
+        AnimSpeed::Instant => 0.0,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Every spacing rung is a positive multiple of 4 — keeps the scale
+    /// honest if someone tweaks values later.
+    #[test]
+    fn spacing_scale_is_a_4_multiple_geometric_progression() {
+        for v in [SPACE_1, SPACE_2, SPACE_3, SPACE_4, SPACE_5, SPACE_6, SPACE_7] {
+            assert!(v > 0.0, "spacing tokens must be positive");
+            assert!(
+                (v.rem_euclid(4.0)).abs() < f32::EPSILON,
+                "spacing token {v} must be a 4-multiple"
+            );
+        }
+    }
+
+    /// Type scale is monotonically decreasing display → caption.
+    #[test]
+    fn type_scale_is_monotonically_decreasing() {
+        let scale = [TYPE_DISPLAY, TYPE_HEADLINE, TYPE_BODY_LG, TYPE_BODY, TYPE_CAPTION];
+        for window in scale.windows(2) {
+            assert!(
+                window[0] > window[1],
+                "type scale must be monotonically decreasing: {} should be > {}",
+                window[0],
+                window[1]
+            );
+        }
+    }
+
+    /// Z-index hierarchy is monotonically increasing through documented
+    /// layers, so a future add-a-layer change can't accidentally land
+    /// in the wrong slot.
+    #[test]
+    fn z_index_hierarchy_is_monotonically_increasing() {
+        let layers = [
+            Z_BACKGROUND,
+            Z_PILE_MARKER,
+            Z_HUD,
+            Z_HUD_TOP,
+            Z_MODAL_SCRIM,
+            Z_MODAL_PANEL,
+            Z_PAUSE,
+            Z_ONBOARDING,
+            Z_WIN_CASCADE,
+            Z_TOAST,
+        ];
+        for window in layers.windows(2) {
+            assert!(
+                window[0] < window[1],
+                "z-index hierarchy must be monotonically increasing: {} should be < {}",
+                window[0],
+                window[1]
+            );
+        }
+    }
+
+    #[test]
+    fn scaled_duration_matches_anim_speed() {
+        assert!((scaled_duration(0.18, AnimSpeed::Normal) - 0.18).abs() < f32::EPSILON);
+        assert!((scaled_duration(0.18, AnimSpeed::Fast) - 0.09).abs() < f32::EPSILON);
+        assert_eq!(scaled_duration(0.18, AnimSpeed::Instant), 0.0);
+    }
+}