feat: app 端 ui 设计完成

wei_ai_app/lib/config/theme.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
+
+class AppTheme {
+  // Cyberpunk Color Palette
+  static const Color neonBlue = Color(0xFF00F0FF);
+  static const Color neonPurple = Color(0xFFBC13FE);
+  static const Color neonGreen = Color(0xFF0AFF99);
+  static const Color darkBg = Color(0xFF050510);
+  static const Color darkSurface = Color(0xFF13132B);
+  static const Color textPrimary = Color(0xFFE0E0FF);
+  static const Color textSecondary = Color(0xFFA0A0C0);
+
+  static final ThemeData darkTheme = ThemeData(
+    useMaterial3: true,
+    brightness: Brightness.dark,
+    scaffoldBackgroundColor: darkBg,
+    
+    // Typography
+    textTheme: GoogleFonts.outfitTextTheme(ThemeData.dark().textTheme).copyWith(
+      displayLarge: const TextStyle(color: textPrimary, fontWeight: FontWeight.bold),
+      displayMedium: const TextStyle(color: textPrimary, fontWeight: FontWeight.bold),
+      bodyLarge: const TextStyle(color: textPrimary),
+      bodyMedium: const TextStyle(color: textSecondary),
+    ),
+
+    // Color Scheme
+    colorScheme: const ColorScheme.dark(
+      primary: neonBlue,
+      secondary: neonPurple,
+      surface: darkBg, // Use darkBg as surface or stick to darkSurface? Let's use darkBg here as background replacement
+      error: Color(0xFFFF2A6D),
+      onPrimary: Colors.black,
+      onSecondary: Colors.white,
+      onSurface: textPrimary,
+    ),
+
+    // Component Themes
+    appBarTheme: const AppBarTheme(
+      backgroundColor: Colors.transparent,
+      elevation: 0,
+      centerTitle: true,
+      titleTextStyle: TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: textPrimary),
+    ),
+
+    bottomNavigationBarTheme: const BottomNavigationBarThemeData(
+      backgroundColor: darkSurface,
+      selectedItemColor: neonBlue,
+      unselectedItemColor: textSecondary,
+      type: BottomNavigationBarType.fixed,
+      showSelectedLabels: true,
+      showUnselectedLabels: true,
+    ),
+    
+    iconTheme: const IconThemeData(
+      color: neonBlue,
+    ),
+  );
+}