Mobile Design Formula (MOBILE APP ONLY)

AUTO-TRIGGER

Invoke lần đầu tiên mỗi session khi:

• User nói: "build app/màn hình/screen/widget Flutter/RN"
• User nói: "thêm/sửa UI mobile/app"
• Agent sắp edit/write file .dart .swift .kt .java (trong project mobile)
• Agent sắp chạm thư mục mobile/ lib/ ios/ android/

KHÔNG dùng khi

• Web (React, Next.js, Vue, Svelte, HTML/CSS) → dùng frontend-design
• Backend — không có UI

Tư duy cốt lõi

Mobile ≠ Web thu nhỏ. Công thức khác hoàn toàn:

Platform conventions (BẮT BUỘC tuân thủ)

Flutter

• Material 3 (Android) / Cupertino (iOS) — detect platform, render đúng widget
• Dùng Theme.of(context) thay hardcode color
• MediaQuery cho responsive, SafeArea cho notch
• Hero animation cho screen transition
• State: Riverpod / BLoC, KHÔNG setState cho state phức tạp

React Native

• Platform.OS check để render iOS/Android khác nhau
• SafeAreaView (react-native-safe-area-context)
• react-native-reanimated cho animation (60fps), KHÔNG Animated API cũ
• Navigation: React Navigation (stack/tab/drawer)

SwiftUI / Jetpack Compose

• Follow Apple HIG / Material 3 spec 100%
• System fonts, system colors (dark mode auto)
• Accessibility-first: VoiceOver / TalkBack

Design tokens (cho Commerce mobile app)

// Flutter example — lib/core/theme.dart
class AppColors {
  // Light mode
  static const bgPrimary = Color(0xFFF5F5F7);
  static const bgCard = Color(0xFFFFFFFF);
  static const textPrimary = Color(0xFF1A1A1A);
  static const textMuted = Color(0xFF666666);
  static const accent = Color(0xFF007AFF);  // iOS blue — hoặc Material 3 seed
  static const danger = Color(0xFFFF3B30);
  static const border = Color(0xFFE5E5E7);

  // Dark mode
  static const bgPrimaryDark = Color(0xFF000000);
  static const bgCardDark = Color(0xFF1C1C1E);
  static const textPrimaryDark = Color(0xFFF5F0EB);
  // ...
}

class AppSpacing {
  static const xs = 4.0;   // 4dp
  static const sm = 8.0;
  static const md = 16.0;  // base
  static const lg = 24.0;
  static const xl = 32.0;
  static const xxl = 48.0;
}

class AppTypography {
  static const display = TextStyle(fontSize: 32, fontWeight: FontWeight.w700, height: 1.2);
  static const title = TextStyle(fontSize: 24, fontWeight: FontWeight.w600, height: 1.25);
  static const headline = TextStyle(fontSize: 20, fontWeight: FontWeight.w600);
  static const body = TextStyle(fontSize: 16, fontWeight: FontWeight.w400, height: 1.5);
  static const bodySmall = TextStyle(fontSize: 14, fontWeight: FontWeight.w400, height: 1.4);
  static const caption = TextStyle(fontSize: 12, fontWeight: FontWeight.w500, letterSpacing: 0.5);
}

class AppRadius {
  static const sm = 8.0;
  static const md = 12.0;
  static const lg = 16.0;  // card/modal default
  static const xl = 24.0;
  static const pill = 999.0;
}

Mobile UX rules

1. Touch target ≥ 44pt (iOS) / 48dp (Android) — không được nhỏ hơn
2. Feedback trong 100ms — haptic, visual press state
3. Loading ≤ 300ms → không cần indicator (user không kịp nhận ra)
4. Loading > 1s → phải có skeleton/shimmer (không spinner thuần)
5. Gesture natural — swipe back iOS, pull-to-refresh, long-press menu
6. Offline-first — cache data local, sync background (quan trọng với Commerce VN)
7. Keyboard awareness — scroll content lên khi keyboard mở, don't hide inputs
8. Error recovery — mọi error phải có CTA retry, không dead-end

Anti-patterns

Self-check trước khi ship mobile UI

□ Touch targets ≥ 44pt/48dp?
□ Theme tokens dùng nhất quán (không hardcode color/spacing)?
□ Dark mode support?
□ Loading state (skeleton, không spinner thuần)?
□ Empty state có illustration + CTA?
□ Error state có retry button?
□ Keyboard handling (scroll, dismiss, action button)?
□ SafeArea cho notch/home indicator?
□ Accessibility (semanticsLabel, contrast ≥ 4.5:1)?
□ 60fps khi scroll list dài? (flutter profile mode test)
□ Offline graceful (cached data + sync indicator)?
□ Haptic feedback trên action quan trọng?

TODO — khi Commerce bắt đầu build mobile

Hiện chưa có project mobile nào của anh active. Khi bắt đầu Flutter admin app, expand skill này với:

• Riverpod patterns cho Commerce state (shops, orders, products)
• Hive/Isar offline storage cho order pipeline
• Image caching strategy cho product catalog
• Barcode scanner integration cho inventory
• Bluetooth printer cho in đơn (Commerce-specific)
• VNPay / MoMo SDK mobile integration
• Push notification (FCM/APNs) cho order updates