Mobile Client Guardrails (loh-mobile)

1. Touch-First Design

Rule: All gameplay and UI interactions MUST be usable via touch.

• Size Targets: Touch targets must be at least 44x44 points (approx 7-10mm physical size).
• Gestures: Support standard gestures (tap, drag, pinch) where intuitive.
• No Hover: Do NOT rely on hover states for critical information. Use "press and hold" or toggle clicks for tooltips.

2. Screen Space & Layout

• SafeArea: Respect safe areas (notches, dynamic islands, home bars) on iOS and Android.
• Responsive UI: UI must adapt to various aspect ratios (16:9, 19.5:9, 4:3 on iPad/Tablets).
• Text Readability: Minimum font size of 12sp for readability on small screens.

3. Performance & Battery

• Frame Rate: Target 30fps default for battery saving, with 60fps optional toggle.
• V-Sync: Always enabled to prevent tearing and wasted battery.
• Optimized Assets: Use compressed texture formats (ASTC/ETC2).

4. Platform Compliance

• Permissions: Request permissions (Camera, Location, etc.) only when needed and with context.
• Privacy, Data collection must be transparent and user-authorized.

5. Implementation Standards

• Conditional Compilation: Use #[cfg(target_os = "android")] or #[cfg(target_os = "ios")] for platform-specific code.
• Asset Loading: Ensure assets are bundled correctly and loaded asynchronously.

6. Build & Deploy

• ** targets**: aarch64-linux-android and aarch64-apple-ios must always compile.
• Signing: Debug builds can use debug keys, but Release builds must use secure signing config (handled in CI/CD).