diff --git a/docs/android/PLAYABILITY_TODO.md b/docs/android/PLAYABILITY_TODO.md
index 04c6a1a..c2c5073 100644
--- a/docs/android/PLAYABILITY_TODO.md
+++ b/docs/android/PLAYABILITY_TODO.md
@@ -135,10 +135,21 @@ rewrites required.
     the 0.5 s threshold fires).
   Hardware verification needed: confirm the 0.5 s hold feel, verify
   sliding to a destination and lifting confirms the move.
-- [ ] **HUD typography.** Reduce text sizes for `Score:`, `Moves:`,
-  timer so they fit cleanly in one row.
-- [ ] **Orientation lock.** Set `android:screenOrientation="portrait"`
-  in cargo-apk manifest (or design a landscape layout).
+- [x] **HUD typography.** *Closed 2026-05-11.* New system
+  `update_hud_typography` fires on `WindowResized` and adjusts Tier-1
+  font sizes based on viewport width. Below 480 logical px: Score
+  `TYPE_HEADLINE` (26) → `TYPE_BODY_LG` (18), Moves/Timer
+  `TYPE_BODY_LG` (18) → `TYPE_CAPTION` (11), so all three items fit
+  in the 180 dp HUD column on a 360 dp phone. At ≥ 480 px the
+  original sizes are restored — desktop/tablet layout unchanged.
+  `add_message::<WindowResized>()` added defensively to `HudPlugin`
+  so the system works under `MinimalPlugins` in tests.
+- [x] **Orientation lock.** *Closed 2026-05-11.* Added
+  `[package.metadata.android.application.activity]` section to
+  `solitaire_app/Cargo.toml` with `orientation = "portrait"`.
+  cargo-apk/ndk-build maps this to `android:screenOrientation="portrait"`
+  in the generated `AndroidManifest.xml`. Remove (or add a landscape
+  layout) before enabling auto-rotate.
 
 ## P3 — Asset density
 
diff --git a/solitaire_app/Cargo.toml b/solitaire_app/Cargo.toml
index 0d25fd6..d0c9c65 100644
--- a/solitaire_app/Cargo.toml
+++ b/solitaire_app/Cargo.toml
@@ -82,3 +82,9 @@ label = "Solitaire Quest"
 # `debuggable` defaults to false on release builds; cargo-apk flips it
 # automatically for debug profiles. Leaving the field unset keeps the
 # default behaviour.
+
+[package.metadata.android.application.activity]
+# Lock to portrait — the current layout has only been designed and tested
+# in portrait orientation. Remove (or add a landscape layout) before
+# enabling auto-rotate.
+orientation = "portrait"
diff --git a/solitaire_engine/src/hud_plugin.rs b/solitaire_engine/src/hud_plugin.rs
index 88459e9..7444908 100644
--- a/solitaire_engine/src/hud_plugin.rs
+++ b/solitaire_engine/src/hud_plugin.rs
@@ -7,6 +7,7 @@
 //! without a separate tick system.
 
 use bevy::prelude::*;
+use bevy::window::WindowResized;
 use solitaire_core::card::Suit;
 use solitaire_core::game_state::{DrawMode, GameMode};
 use solitaire_core::pile::PileType;
@@ -324,11 +325,15 @@ impl Plugin for HudPlugin {
             .add_message::<WinStreakMilestoneEvent>()
             .init_resource::<PreviousScore>()
             .init_resource::<HudActionFade>()
+            // WindowResized is registered by table_plugin; re-register
+            // defensively so the HUD plugin works standalone in tests.
+            .add_message::<WindowResized>()
             .add_systems(Startup, (spawn_hud_band, spawn_hud, spawn_action_buttons))
             .add_systems(Update, update_hud.after(GameMutation))
             .add_systems(Update, update_won_previously.after(GameMutation))
             .add_systems(Update, announce_auto_complete.after(GameMutation))
             .add_systems(Update, update_selection_hud)
+            .add_systems(Update, update_hud_typography)
             .add_systems(
                 Update,
                 (
@@ -2003,6 +2008,48 @@ pub fn challenge_time_color(remaining: u64) -> Color {
     }
 }
 
+/// Scales HUD Tier-1 font sizes to fit a narrow viewport.
+///
+/// Fires on every `WindowResized` event. Below 480 logical pixels wide the
+/// score drops from `TYPE_HEADLINE` (26 px) to `TYPE_BODY_LG` (18 px) and the
+/// Moves/Timer labels drop from `TYPE_BODY_LG` to `TYPE_CAPTION` (11 px), so
+/// all three items remain on one row inside the 50 %-wide HUD column
+/// (≈ 180 dp on a 360 dp phone).  At ≥ 480 px the original sizes are
+/// restored so desktop/tablet layouts are unaffected.
+fn update_hud_typography(
+    mut events: MessageReader<WindowResized>,
+    mut score_q: Query<
+        &mut TextFont,
+        (With<HudScore>, Without<HudMoves>, Without<HudTime>),
+    >,
+    mut moves_q: Query<
+        &mut TextFont,
+        (With<HudMoves>, Without<HudScore>, Without<HudTime>),
+    >,
+    mut time_q: Query<
+        &mut TextFont,
+        (With<HudTime>, Without<HudScore>, Without<HudMoves>),
+    >,
+) {
+    let Some(ev) = events.read().last() else {
+        return;
+    };
+    let (score_size, secondary_size) = if ev.width < 480.0 {
+        (TYPE_BODY_LG, TYPE_CAPTION)
+    } else {
+        (TYPE_HEADLINE, TYPE_BODY_LG)
+    };
+    for mut font in &mut score_q {
+        font.font_size = score_size;
+    }
+    for mut font in &mut moves_q {
+        font.font_size = secondary_size;
+    }
+    for mut font in &mut time_q {
+        font.font_size = secondary_size;
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;