refactor: Migrate to Tweakcn themes and enhance UI consistency

- Replaced references to AppColorPalettes with TweakcnThemes across various files to standardize theme usage.
- Updated the AppTheme and AppColorTokens to utilize TweakcnThemeDefinition for improved theme management.
- Adjusted UI components in ChatPage, ChatsDrawer, AppCustomizationPage, and ProfilePage to align with the new theme structure, ensuring consistent styling and color application.
- Removed the deprecated color_palettes.dart file to streamline the theme architecture.

lib/core/providers/app_providers.dart

@@ -25,7 +25,7 @@ import '../services/optimized_storage_service.dart';
 import '../services/socket_service.dart';
 import '../utils/debug_logger.dart';
 import '../models/socket_event.dart';
-import '../../shared/theme/color_palettes.dart';
+import '../../shared/theme/tweakcn_themes.dart';
 import '../../shared/theme/app_theme.dart';
 import '../../features/tools/providers/tools_providers.dart';
 
@@ -88,14 +88,14 @@ class AppThemePalette extends _$AppThemePalette {
   late final OptimizedStorageService _storage;
 
   @override
-  AppColorPalette build() {
+  TweakcnThemeDefinition build() {
     _storage = ref.watch(optimizedStorageServiceProvider);
     final storedId = _storage.getThemePaletteId();
-    return AppColorPalettes.byId(storedId);
+    return TweakcnThemes.byId(storedId);
   }
 
   Future<void> setPalette(String paletteId) async {
-    final palette = AppColorPalettes.byId(paletteId);
+    final palette = TweakcnThemes.byId(paletteId);
     state = palette;
     await _storage.setThemePaletteId(palette.id);
   }

lib/core/services/enhanced_accessibility_service.dart

@@ -2,7 +2,7 @@ import 'dart:math' as math;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter/semantics.dart';
-import '../../shared/theme/color_palettes.dart';
+import '../../shared/theme/tweakcn_themes.dart';
 import '../../shared/theme/theme_extensions.dart';
 
 /// Enhanced accessibility service for WCAG 2.2 AA compliance
@@ -349,7 +349,7 @@ class EnhancedAccessibilityService {
     return BoxDecoration(
       border: hasFocus
           ? Border.all(
-              color: focusColor ?? AppColorPalettes.auroraViolet.light.primary,
+              color: focusColor ?? TweakcnThemes.t3Chat.light.primary,
               width: borderWidth,
             )
           : null,

lib/features/chat/views/chat_page.dart

@@ -1217,12 +1217,15 @@ class _ChatPageState extends ConsumerState<ChatPage> {
                       .set(false);
                 } catch (_) {}
               },
-              drawer: SafeArea(
-                top: true,
-                bottom: true,
-                left: false,
-                right: false,
-                child: const ChatsDrawer(),
+              drawer: Container(
+                color: context.sidebarTheme.background,
+                child: SafeArea(
+                  top: true,
+                  bottom: true,
+                  left: false,
+                  right: false,
+                  child: const ChatsDrawer(),
+                ),
               ),
               child: Scaffold(
                 backgroundColor: context.conduitTheme.surfaceBackground,

lib/features/navigation/widgets/chats_drawer.dart

@@ -152,10 +152,13 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
   @override
   Widget build(BuildContext context) {
     // Bottom section now only shows navigation actions
-    final theme = context.conduitTheme;
+    final sidebarTheme = context.sidebarTheme;
 
     return Container(
-      color: theme.surfaceBackground,
+      decoration: BoxDecoration(
+        color: sidebarTheme.background,
+        border: Border(right: BorderSide(color: sidebarTheme.border)),
+      ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: [
@@ -169,7 +172,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
             child: Row(children: [Expanded(child: _buildSearchField(context))]),
           ),
           Expanded(child: _buildConversationList(context)),
-          Divider(height: 1, color: theme.dividerColor),
+          Divider(height: 1, color: sidebarTheme.border),
           _buildBottomSection(context),
         ],
       ),
@@ -177,23 +180,23 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
   }
 
   Widget _buildSearchField(BuildContext context) {
-    final theme = context.conduitTheme;
+    final sidebarTheme = context.sidebarTheme;
     return Material(
       color: Colors.transparent,
       child: TextField(
         controller: _searchController,
         focusNode: _searchFocusNode,
         onChanged: (_) => _onSearchChanged(),
-        style: AppTypography.standard.copyWith(color: theme.inputText),
+        style: AppTypography.standard.copyWith(color: sidebarTheme.foreground),
         decoration: InputDecoration(
           isDense: true,
           hintText: AppLocalizations.of(context)!.searchConversations,
           hintStyle: AppTypography.standard.copyWith(
-            color: theme.inputPlaceholder,
+            color: sidebarTheme.foreground.withValues(alpha: 0.6),
           ),
           prefixIcon: Icon(
             Platform.isIOS ? CupertinoIcons.search : Icons.search,
-            color: theme.iconSecondary,
+            color: sidebarTheme.foreground.withValues(alpha: 0.7),
             size: IconSize.input,
           ),
           prefixIconConstraints: const BoxConstraints(
@@ -211,7 +214,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
                     Platform.isIOS
                         ? CupertinoIcons.clear_circled_solid
                         : Icons.clear,
-                    color: theme.iconSecondary,
+                    color: sidebarTheme.foreground.withValues(alpha: 0.7),
                     size: IconSize.input,
                   ),
                 )
@@ -221,18 +224,18 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
             minHeight: TouchTarget.minimum,
           ),
           filled: true,
-          fillColor: theme.inputBackground,
+          fillColor: sidebarTheme.accent.withValues(alpha: 0.9),
           border: OutlineInputBorder(
             borderRadius: BorderRadius.circular(AppBorderRadius.md),
             borderSide: BorderSide.none,
           ),
           enabledBorder: OutlineInputBorder(
             borderRadius: BorderRadius.circular(AppBorderRadius.md),
-            borderSide: BorderSide(color: theme.inputBorder, width: 1),
+            borderSide: BorderSide(color: sidebarTheme.border, width: 1),
           ),
           focusedBorder: OutlineInputBorder(
             borderRadius: BorderRadius.circular(AppBorderRadius.md),
-            borderSide: BorderSide(color: theme.buttonPrimary, width: 1),
+            borderSide: BorderSide(color: sidebarTheme.ring, width: 1.2),
           ),
           contentPadding: const EdgeInsets.symmetric(
             horizontal: Spacing.md,
@@ -673,7 +676,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
           child: Text(
             'Search failed',
             style: AppTypography.bodyMediumStyle.copyWith(
-              color: theme.textSecondary,
+              color: context.sidebarTheme.foreground.withValues(alpha: 0.7),
             ),
           ),
         ),
@@ -682,13 +685,13 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
   }
 
   Widget _buildSectionHeader(String title, int count) {
-    final theme = context.conduitTheme;
+    final sidebarTheme = context.sidebarTheme;
     return Row(
       children: [
         Text(
           title,
           style: AppTypography.labelStyle.copyWith(
-            color: theme.textSecondary,
+            color: sidebarTheme.foreground.withValues(alpha: 0.9),
             fontWeight: FontWeight.w600,
             decoration: TextDecoration.none,
           ),
@@ -697,17 +700,17 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
         Container(
           padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
           decoration: BoxDecoration(
-            color: theme.surfaceContainer.withValues(alpha: 0.4),
+            color: sidebarTheme.accent.withValues(alpha: 0.7),
             borderRadius: BorderRadius.circular(AppBorderRadius.xs),
             border: Border.all(
-              color: theme.dividerColor.withValues(alpha: 0.5),
+              color: sidebarTheme.border.withValues(alpha: 0.6),
               width: BorderWidth.thin,
             ),
           ),
           child: Text(
             '$count',
             style: AppTypography.tiny.copyWith(
-              color: theme.textSecondary,
+              color: sidebarTheme.foreground.withValues(alpha: 0.8),
               decoration: TextDecoration.none,
             ),
           ),
@@ -1432,6 +1435,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
 
   Widget _buildBottomSection(BuildContext context) {
     final theme = context.conduitTheme;
+    final sidebarTheme = context.sidebarTheme;
     final currentUserAsync = ref.watch(currentUserProvider);
     final userFromProfile = currentUserAsync.maybeWhen(
       data: (u) => u,
@@ -1460,10 +1464,10 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
             Container(
               padding: const EdgeInsets.all(Spacing.sm),
               decoration: BoxDecoration(
-                color: theme.surfaceContainer.withValues(alpha: 0.3),
+                color: sidebarTheme.accent.withValues(alpha: 0.6),
                 borderRadius: BorderRadius.circular(AppBorderRadius.small),
                 border: Border.all(
-                  color: theme.dividerColor.withValues(alpha: 0.5),
+                  color: sidebarTheme.border.withValues(alpha: 0.6),
                   width: BorderWidth.standard,
                 ),
               ),
@@ -1497,7 +1501,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
                       maxLines: 1,
                       overflow: TextOverflow.ellipsis,
                       style: AppTypography.bodySmallStyle.copyWith(
-                        color: theme.textPrimary,
+                        color: sidebarTheme.foreground,
                         fontWeight: FontWeight.w600,
                         decoration: TextDecoration.none,
                       ),
@@ -1514,7 +1518,7 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
                       Platform.isIOS
                           ? CupertinoIcons.settings
                           : Icons.settings_rounded,
-                      color: theme.iconSecondary,
+                      color: sidebarTheme.foreground.withValues(alpha: 0.8),
                       size: IconSize.medium,
                     ),
                   ),

lib/features/profile/views/app_customization_page.dart

@@ -6,7 +6,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../../core/services/settings_service.dart';
 import '../../../shared/theme/theme_extensions.dart';
-import '../../../shared/theme/color_palettes.dart';
+import '../../../shared/theme/tweakcn_themes.dart';
 import '../../tools/providers/tools_providers.dart';
 import '../../../core/models/tool.dart';
 import '../../../shared/widgets/conduit_components.dart';
@@ -38,10 +38,10 @@ class AppCustomizationPage extends ConsumerWidget {
     final locale = ref.watch(appLocaleProvider);
     final currentLanguageCode = locale?.languageCode ?? 'system';
     final languageLabel = _resolveLanguageLabel(context, currentLanguageCode);
-    final activePalette = ref.watch(appThemePaletteProvider);
+    final activeTheme = ref.watch(appThemePaletteProvider);
 
     return Scaffold(
-      backgroundColor: context.conduitTheme.surfaceBackground,
+      backgroundColor: context.sidebarTheme.background,
       appBar: _buildAppBar(context),
       body: SafeArea(
         child: ListView(
@@ -61,7 +61,7 @@ class AppCustomizationPage extends ConsumerWidget {
               currentLanguageCode,
               languageLabel,
               settings,
-              activePalette,
+              activeTheme,
             ),
             const SizedBox(height: Spacing.xl),
             _buildQuickPillsSection(context, ref, settings),
@@ -78,7 +78,7 @@ class AppCustomizationPage extends ConsumerWidget {
   PreferredSizeWidget _buildAppBar(BuildContext context) {
     final canPop = ModalRoute.of(context)?.canPop ?? false;
     return AppBar(
-      backgroundColor: context.conduitTheme.surfaceBackground,
+      backgroundColor: context.sidebarTheme.background,
       surfaceTintColor: Colors.transparent,
       elevation: Elevation.none,
       toolbarHeight: kToolbarHeight,
@@ -116,7 +116,7 @@ class AppCustomizationPage extends ConsumerWidget {
     String currentLanguageCode,
     String languageLabel,
     AppSettings settings,
-    AppColorPalette palette,
+    TweakcnThemeDefinition activeTheme,
   ) {
     final theme = context.conduitTheme;
 
@@ -126,13 +126,13 @@ class AppCustomizationPage extends ConsumerWidget {
         Text(
           AppLocalizations.of(context)!.display,
           style:
-              theme.headingSmall?.copyWith(color: theme.textPrimary) ??
-              TextStyle(color: theme.textPrimary, fontSize: 18),
+              theme.headingSmall?.copyWith(color: theme.sidebarForeground) ??
+              TextStyle(color: theme.sidebarForeground, fontSize: 18),
         ),
         const SizedBox(height: Spacing.sm),
         _buildThemeSelector(context, ref, themeMode, themeDescription),
         const SizedBox(height: Spacing.md),
-        _buildPaletteSelector(context, ref, palette),
+        _buildPaletteSelector(context, ref, activeTheme),
         const SizedBox(height: Spacing.md),
         _CustomizationTile(
           leading: _buildIconBadge(
@@ -196,7 +196,7 @@ class AppCustomizationPage extends ConsumerWidget {
                     Text(
                       AppLocalizations.of(context)!.darkMode,
                       style: theme.bodyMedium?.copyWith(
-                        color: theme.textPrimary,
+                        color: theme.sidebarForeground,
                         fontWeight: FontWeight.w600,
                       ),
                     ),
@@ -204,7 +204,7 @@ class AppCustomizationPage extends ConsumerWidget {
                     Text(
                       themeDescription,
                       style: theme.bodySmall?.copyWith(
-                        color: theme.textSecondary,
+                        color: theme.sidebarForeground.withValues(alpha: 0.75),
                       ),
                     ),
                   ],
@@ -260,10 +260,10 @@ class AppCustomizationPage extends ConsumerWidget {
   Widget _buildPaletteSelector(
     BuildContext context,
     WidgetRef ref,
-    AppColorPalette activePalette,
+    TweakcnThemeDefinition activeTheme,
   ) {
     final theme = context.conduitTheme;
-    final palettes = AppColorPalettes.all;
+    final palettes = TweakcnThemes.all;
 
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
@@ -272,17 +272,22 @@ class AppCustomizationPage extends ConsumerWidget {
           AppLocalizations.of(context)!.themePalette,
           style:
               theme.bodyLarge?.copyWith(
-                color: theme.textPrimary,
+                color: theme.sidebarForeground,
                 fontWeight: FontWeight.w600,
               ) ??
-              TextStyle(color: theme.textPrimary, fontWeight: FontWeight.w600),
+              TextStyle(
+                color: theme.sidebarForeground,
+                fontWeight: FontWeight.w600,
+              ),
         ),
         const SizedBox(height: Spacing.xs),
         Text(
           AppLocalizations.of(context)!.themePaletteDescription,
           style:
-              theme.bodySmall?.copyWith(color: theme.textSecondary) ??
-              TextStyle(color: theme.textSecondary),
+              theme.bodySmall?.copyWith(
+                color: theme.sidebarForeground.withValues(alpha: 0.75),
+              ) ??
+              TextStyle(color: theme.sidebarForeground.withValues(alpha: 0.75)),
         ),
         const SizedBox(height: Spacing.sm),
         ConduitCard(
@@ -291,8 +296,8 @@ class AppCustomizationPage extends ConsumerWidget {
             children: [
               for (final palette in palettes)
                 _PaletteOption(
-                  palette: palette,
-                  activeId: activePalette.id,
+                  themeDefinition: palette,
+                  activeId: activeTheme.id,
                   onSelect: () => ref
                       .read(appThemePaletteProvider.notifier)
                       .setPalette(palette.id),
@@ -378,8 +383,8 @@ class AppCustomizationPage extends ConsumerWidget {
         Text(
           AppLocalizations.of(context)!.onboardQuickTitle,
           style:
-              theme.headingSmall?.copyWith(color: theme.textPrimary) ??
-              TextStyle(color: theme.textPrimary, fontSize: 18),
+              theme.headingSmall?.copyWith(color: theme.sidebarForeground) ??
+              TextStyle(color: theme.sidebarForeground, fontSize: 18),
         ),
         const SizedBox(height: Spacing.sm),
         ConduitCard(
@@ -403,7 +408,7 @@ class AppCustomizationPage extends ConsumerWidget {
                     child: Text(
                       AppLocalizations.of(context)!.quickActionsDescription,
                       style: theme.bodySmall?.copyWith(
-                        color: theme.textSecondary,
+                        color: theme.sidebarForeground.withValues(alpha: 0.75),
                       ),
                     ),
                   ),
@@ -461,8 +466,8 @@ class AppCustomizationPage extends ConsumerWidget {
         Text(
           l10n.chatSettings,
           style:
-              theme.headingSmall?.copyWith(color: theme.textPrimary) ??
-              TextStyle(color: theme.textPrimary, fontSize: 18),
+              theme.headingSmall?.copyWith(color: theme.sidebarForeground) ??
+              TextStyle(color: theme.sidebarForeground, fontSize: 18),
         ),
         const SizedBox(height: Spacing.sm),
         _CustomizationTile(
@@ -500,8 +505,8 @@ class AppCustomizationPage extends ConsumerWidget {
         Text(
           l10n.ttsSettings,
           style:
-              theme.headingSmall?.copyWith(color: theme.textPrimary) ??
-              TextStyle(color: theme.textPrimary, fontSize: 18),
+              theme.headingSmall?.copyWith(color: theme.sidebarForeground) ??
+              TextStyle(color: theme.sidebarForeground, fontSize: 18),
         ),
         const SizedBox(height: Spacing.sm),
         // Voice Selection
@@ -621,20 +626,23 @@ class AppCustomizationPage extends ConsumerWidget {
                   title,
                   style:
                       theme.bodyMedium?.copyWith(
-                        color: theme.textPrimary,
+                        color: theme.sidebarForeground,
                         fontWeight: FontWeight.w500,
                       ) ??
-                      TextStyle(color: theme.textPrimary, fontSize: 14),
+                      TextStyle(color: theme.sidebarForeground, fontSize: 14),
                 ),
               ),
               Text(
                 label,
                 style:
                     theme.bodyMedium?.copyWith(
-                      color: theme.textSecondary,
+                      color: theme.sidebarForeground.withValues(alpha: 0.75),
                       fontWeight: FontWeight.w500,
                     ) ??
-                    TextStyle(color: theme.textSecondary, fontSize: 14),
+                    TextStyle(
+                      color: theme.sidebarForeground.withValues(alpha: 0.75),
+                      fontSize: 14,
+                    ),
               ),
             ],
           ),
@@ -718,7 +726,7 @@ class AppCustomizationPage extends ConsumerWidget {
 
     showModalBottomSheet<void>(
       context: context,
-      backgroundColor: theme.surfaceBackground,
+      backgroundColor: theme.sidebarBackground,
       isScrollControlled: true,
       shape: const RoundedRectangleBorder(
         borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
@@ -741,10 +749,10 @@ class AppCustomizationPage extends ConsumerWidget {
                         l10n.ttsSelectVoice,
                         style:
                             theme.headingSmall?.copyWith(
-                              color: theme.textPrimary,
+                              color: theme.sidebarForeground,
                             ) ??
                             TextStyle(
-                              color: theme.textPrimary,
+                              color: theme.sidebarForeground,
                               fontSize: 18,
                               fontWeight: FontWeight.bold,
                             ),
@@ -765,18 +773,18 @@ class AppCustomizationPage extends ConsumerWidget {
                       ios: CupertinoIcons.speaker_3,
                       android: Icons.record_voice_over,
                     ),
-                    color: theme.textPrimary,
+                    color: theme.sidebarForeground,
                   ),
                   title: Text(
                     l10n.ttsSystemDefault,
                     style:
                         theme.bodyMedium?.copyWith(
-                          color: theme.textPrimary,
+                          color: theme.sidebarForeground,
                           fontWeight: settings.ttsVoice == null
                               ? FontWeight.bold
                               : FontWeight.normal,
                         ) ??
-                        TextStyle(color: theme.textPrimary),
+                        TextStyle(color: theme.sidebarForeground),
                   ),
                   trailing: settings.ttsVoice == null
                       ? Icon(Icons.check, color: theme.buttonPrimary)
@@ -809,11 +817,15 @@ class AppCustomizationPage extends ConsumerWidget {
                             ),
                             style:
                                 theme.bodySmall?.copyWith(
-                                  color: theme.textSecondary,
+                                  color: theme.sidebarForeground.withValues(
+                                    alpha: 0.75,
+                                  ),
                                   fontWeight: FontWeight.bold,
                                 ) ??
                                 TextStyle(
-                                  color: theme.textSecondary,
+                                  color: theme.sidebarForeground.withValues(
+                                    alpha: 0.75,
+                                  ),
                                   fontSize: 12,
                                   fontWeight: FontWeight.bold,
                                 ),
@@ -831,11 +843,15 @@ class AppCustomizationPage extends ConsumerWidget {
                             l10n.ttsOtherVoices,
                             style:
                                 theme.bodySmall?.copyWith(
-                                  color: theme.textSecondary,
+                                  color: theme.sidebarForeground.withValues(
+                                    alpha: 0.75,
+                                  ),
                                   fontWeight: FontWeight.bold,
                                 ) ??
                                 TextStyle(
-                                  color: theme.textSecondary,
+                                  color: theme.sidebarForeground.withValues(
+                                    alpha: 0.75,
+                                  ),
                                   fontSize: 12,
                                   fontWeight: FontWeight.bold,
                                 ),
@@ -866,28 +882,32 @@ class AppCustomizationPage extends ConsumerWidget {
                             ios: CupertinoIcons.person_fill,
                             android: Icons.person,
                           ),
-                          color: theme.textPrimary,
+                          color: theme.sidebarForeground,
                         ),
                         title: Text(
                           displayName,
                           style:
                               theme.bodyMedium?.copyWith(
-                                color: theme.textPrimary,
+                                color: theme.sidebarForeground,
                                 fontWeight: isSelected
                                     ? FontWeight.bold
                                     : FontWeight.normal,
                               ) ??
-                              TextStyle(color: theme.textPrimary),
+                              TextStyle(color: theme.sidebarForeground),
                         ),
                         subtitle: subtitle.isNotEmpty
                             ? Text(
                                 subtitle,
                                 style:
                                     theme.bodySmall?.copyWith(
-                                      color: theme.textSecondary,
+                                      color: theme.sidebarForeground.withValues(
+                                        alpha: 0.75,
+                                      ),
                                     ) ??
                                     TextStyle(
-                                      color: theme.textSecondary,
+                                      color: theme.sidebarForeground.withValues(
+                                        alpha: 0.75,
+                                      ),
                                       fontSize: 12,
                                     ),
                               )
@@ -1162,7 +1182,7 @@ class AppCustomizationPage extends ConsumerWidget {
       isScrollControlled: true,
       builder: (context) => Container(
         decoration: BoxDecoration(
-          color: context.conduitTheme.surfaceBackground,
+          color: context.sidebarTheme.background,
           borderRadius: const BorderRadius.vertical(
             top: Radius.circular(AppBorderRadius.modal),
           ),
@@ -1230,26 +1250,20 @@ class AppCustomizationPage extends ConsumerWidget {
 
 class _PaletteOption extends StatelessWidget {
   const _PaletteOption({
-    required this.palette,
+    required this.themeDefinition,
     required this.activeId,
     required this.onSelect,
   });
 
-  final AppColorPalette palette;
+  final TweakcnThemeDefinition themeDefinition;
   final String activeId;
   final VoidCallback onSelect;
 
   @override
   Widget build(BuildContext context) {
     final theme = context.conduitTheme;
-    final isSelected = palette.id == activeId;
-    final previewColors =
-        palette.preview ??
-        <Color>[
-          palette.light.primary,
-          palette.light.secondary,
-          palette.dark.primary,
-        ];
+    final isSelected = themeDefinition.id == activeId;
+    final previewColors = themeDefinition.preview;
 
     return InkWell(
       onTap: onSelect,
@@ -1274,9 +1288,9 @@ class _PaletteOption extends StatelessWidget {
                     children: [
                       Expanded(
                         child: Text(
-                          palette.label,
+                          themeDefinition.label,
                           style: theme.bodyMedium?.copyWith(
-                            color: theme.textPrimary,
+                            color: theme.sidebarForeground,
                             fontWeight: isSelected
                                 ? FontWeight.w600
                                 : FontWeight.w500,
@@ -1297,10 +1311,18 @@ class _PaletteOption extends StatelessWidget {
                   ),
                   const SizedBox(height: Spacing.xxs),
                   Text(
-                    palette.description,
+                    themeDefinition.description,
                     style:
-                        theme.bodySmall?.copyWith(color: theme.textSecondary) ??
-                        TextStyle(color: theme.textSecondary),
+                        theme.bodySmall?.copyWith(
+                          color: theme.sidebarForeground.withValues(
+                            alpha: 0.75,
+                          ),
+                        ) ??
+                        TextStyle(
+                          color: theme.sidebarForeground.withValues(
+                            alpha: 0.75,
+                          ),
+                        ),
                   ),
                   const SizedBox(height: Spacing.xs),
                   Row(
@@ -1378,14 +1400,16 @@ class _CustomizationTile extends StatelessWidget {
                 Text(
                   title,
                   style: theme.bodyMedium?.copyWith(
-                    color: theme.textPrimary,
+                    color: theme.sidebarForeground,
                     fontWeight: FontWeight.w600,
                   ),
                 ),
                 const SizedBox(height: Spacing.xs),
                 Text(
                   subtitle,
-                  style: theme.bodySmall?.copyWith(color: theme.textSecondary),
+                  style: theme.bodySmall?.copyWith(
+                    color: theme.sidebarForeground.withValues(alpha: 0.75),
+                  ),
                 ),
               ],
             ),

lib/features/profile/views/profile_page.dart

@@ -79,7 +79,7 @@ class ProfilePage extends ConsumerWidget {
 
   Scaffold _buildScaffold(BuildContext context, {required Widget body}) {
     return Scaffold(
-      backgroundColor: context.conduitTheme.surfaceBackground,
+      backgroundColor: context.sidebarTheme.background,
       appBar: _buildAppBar(context),
       body: body,
     );
@@ -88,7 +88,7 @@ class ProfilePage extends ConsumerWidget {
   PreferredSizeWidget _buildAppBar(BuildContext context) {
     final canPop = ModalRoute.of(context)?.canPop ?? false;
     return AppBar(
-      backgroundColor: context.conduitTheme.surfaceBackground,
+      backgroundColor: context.sidebarTheme.background,
       surfaceTintColor: Colors.transparent,
       elevation: Elevation.none,
       toolbarHeight: kToolbarHeight,
@@ -156,8 +156,10 @@ class ProfilePage extends ConsumerWidget {
   Widget _buildSupportSection(BuildContext context) {
     final theme = context.conduitTheme;
     final textTheme =
-        theme.bodySmall?.copyWith(color: theme.textSecondary) ??
-        TextStyle(color: theme.textSecondary);
+        theme.bodySmall?.copyWith(
+          color: theme.sidebarForeground.withValues(alpha: 0.75),
+        ) ??
+        TextStyle(color: theme.sidebarForeground.withValues(alpha: 0.75));
 
     final supportTiles = [
       _buildSupportOption(
@@ -189,7 +191,7 @@ class ProfilePage extends ConsumerWidget {
       children: [
         Text(
           AppLocalizations.of(context)!.supportConduit,
-          style: theme.headingSmall?.copyWith(color: theme.textPrimary),
+          style: theme.headingSmall?.copyWith(color: theme.sidebarForeground),
         ),
         const SizedBox(height: Spacing.xs),
         Text(
@@ -216,7 +218,6 @@ class ProfilePage extends ConsumerWidget {
     final theme = context.conduitTheme;
     return _ProfileSettingTile(
       onTap: () => _openExternalLink(context, url),
-      isDestructive: false,
       leading: _buildIconBadge(context, icon, color: color),
       title: title,
       subtitle: subtitle,
@@ -287,15 +288,14 @@ class ProfilePage extends ConsumerWidget {
 
     final email = extractEmail(user) ?? 'No email';
     final theme = context.conduitTheme;
-    final accent = theme.buttonPrimary;
 
     return Container(
       padding: const EdgeInsets.all(Spacing.md),
       decoration: BoxDecoration(
-        color: accent.withValues(alpha: 0.08),
+        color: theme.sidebarAccent.withValues(alpha: 0.6),
         borderRadius: BorderRadius.circular(AppBorderRadius.large),
         border: Border.all(
-          color: accent.withValues(alpha: 0.15),
+          color: theme.sidebarBorder.withValues(alpha: 0.6),
           width: BorderWidth.thin,
         ),
       ),
@@ -314,7 +314,7 @@ class ProfilePage extends ConsumerWidget {
                     Text(
                       displayName,
                       style: theme.headingMedium?.copyWith(
-                        color: theme.textPrimary,
+                        color: theme.sidebarForeground,
                         fontWeight: FontWeight.w600,
                       ),
                     ),
@@ -327,14 +327,18 @@ class ProfilePage extends ConsumerWidget {
                             android: Icons.mail_outline,
                           ),
                           size: IconSize.small,
-                          color: theme.textSecondary,
+                          color: theme.sidebarForeground.withValues(
+                            alpha: 0.75,
+                          ),
                         ),
                         const SizedBox(width: Spacing.xs),
                         Flexible(
                           child: Text(
                             email,
                             style: theme.bodySmall?.copyWith(
-                              color: theme.textSecondary,
+                              color: theme.sidebarForeground.withValues(
+                                alpha: 0.75,
+                              ),
                             ),
                             overflow: TextOverflow.ellipsis,
                             maxLines: 1,
@@ -377,7 +381,6 @@ class ProfilePage extends ConsumerWidget {
         title: AppLocalizations.of(context)!.signOut,
         subtitle: AppLocalizations.of(context)!.endYourSession,
         onTap: () => _signOut(context, ref),
-        isDestructive: true,
         showChevron: false,
       ),
     ];
@@ -399,14 +402,12 @@ class ProfilePage extends ConsumerWidget {
     required String title,
     required String subtitle,
     required VoidCallback onTap,
-    bool isDestructive = false,
     bool showChevron = true,
   }) {
     final theme = context.conduitTheme;
-    final color = isDestructive ? theme.error : theme.buttonPrimary;
+    final color = theme.buttonPrimary;
     return _ProfileSettingTile(
       onTap: onTap,
-      isDestructive: isDestructive,
       leading: _buildIconBadge(context, icon, color: color),
       title: title,
       subtitle: subtitle,
@@ -456,7 +457,7 @@ class ProfilePage extends ConsumerWidget {
             width: 40,
             height: 40,
             decoration: BoxDecoration(
-              color: theme.surfaceBackground.withValues(alpha: 0.85),
+              color: theme.sidebarAccent.withValues(alpha: 0.8),
               borderRadius: BorderRadius.circular(AppBorderRadius.small),
               border: Border.all(
                 color: theme.cardBorder,
@@ -518,11 +519,10 @@ class ProfilePage extends ConsumerWidget {
             ios: CupertinoIcons.exclamationmark_triangle,
             android: Icons.error_outline,
           ),
-          color: context.conduitTheme.error,
+          color: Colors.red,
         ),
         title: AppLocalizations.of(context)!.defaultModel,
         subtitle: AppLocalizations.of(context)!.failedToLoadModels,
-        isDestructive: true,
         showChevron: false,
         onTap: () => ref.invalidate(modelsProvider),
         trailing: IconButton(
@@ -533,7 +533,7 @@ class ProfilePage extends ConsumerWidget {
               ios: CupertinoIcons.refresh,
               android: Icons.refresh,
             ),
-            color: context.conduitTheme.error,
+            color: Colors.red,
             size: IconSize.small,
           ),
         ),
@@ -589,11 +589,11 @@ class ProfilePage extends ConsumerWidget {
         context: context,
         builder: (ctx) {
           return AlertDialog(
-            backgroundColor: ctx.conduitTheme.surfaceBackground,
+            backgroundColor: ctx.sidebarTheme.background,
             title: Text(
               AppLocalizations.of(ctx)!.aboutConduit,
               style: ctx.conduitTheme.headingSmall?.copyWith(
-                color: ctx.conduitTheme.textPrimary,
+                color: ctx.sidebarTheme.foreground,
               ),
             ),
             content: Column(
@@ -605,7 +605,7 @@ class ProfilePage extends ConsumerWidget {
                     ctx,
                   )!.versionLabel(info.version, info.buildNumber),
                   style: ctx.conduitTheme.bodyMedium?.copyWith(
-                    color: ctx.conduitTheme.textSecondary,
+                    color: ctx.sidebarTheme.foreground.withValues(alpha: 0.75),
                   ),
                 ),
                 const SizedBox(height: Spacing.md),
@@ -704,7 +704,6 @@ class _ProfileSettingTile extends StatelessWidget {
     required this.subtitle,
     this.onTap,
     this.trailing,
-    this.isDestructive = false,
     this.showChevron = true,
   });
 
@@ -713,16 +712,13 @@ class _ProfileSettingTile extends StatelessWidget {
   final String subtitle;
   final VoidCallback? onTap;
   final Widget? trailing;
-  final bool isDestructive;
   final bool showChevron;
 
   @override
   Widget build(BuildContext context) {
     final theme = context.conduitTheme;
-    final textColor = isDestructive ? theme.error : theme.textPrimary;
-    final subtitleColor = isDestructive
-        ? theme.error.withValues(alpha: 0.85)
-        : theme.textSecondary;
+    final textColor = theme.sidebarForeground;
+    final subtitleColor = theme.sidebarForeground.withValues(alpha: 0.75);
 
     return ConduitCard(
       padding: const EdgeInsets.all(Spacing.md),
@@ -888,7 +884,7 @@ class _DefaultModelBottomSheetState
           builder: (context, scrollController) {
             return Container(
               decoration: BoxDecoration(
-                color: context.conduitTheme.surfaceBackground,
+                color: context.sidebarTheme.background,
                 borderRadius: const BorderRadius.vertical(
                   top: Radius.circular(AppBorderRadius.bottomSheet),
                 ),
@@ -1010,8 +1006,9 @@ class _DefaultModelBottomSheetState
                               vertical: 2,
                             ),
                             decoration: BoxDecoration(
-                              color: context.conduitTheme.surfaceBackground
-                                  .withValues(alpha: 0.6),
+                              color: context.sidebarTheme.background.withValues(
+                                alpha: 0.6,
+                              ),
                               borderRadius: BorderRadius.circular(
                                 AppBorderRadius.xs,
                               ),
@@ -1141,7 +1138,7 @@ class _DefaultModelBottomSheetState
         decoration: BoxDecoration(
           color: isSelected
               ? context.conduitTheme.buttonPrimary.withValues(alpha: 0.1)
-              : context.conduitTheme.surfaceBackground.withValues(alpha: 0.05),
+              : context.sidebarTheme.background.withValues(alpha: 0.05),
           borderRadius: BorderRadius.circular(AppBorderRadius.small),
           border: Border.all(
             color: isSelected

lib/shared/services/brand_service.dart

@@ -3,7 +3,7 @@ import '../theme/theme_extensions.dart';
 import 'package:flutter/cupertino.dart';
 import 'dart:io' show Platform;
 import '../theme/color_tokens.dart';
-import '../theme/color_palettes.dart';
+import '../theme/tweakcn_themes.dart';
 
 /// Centralized service for consistent brand identity throughout the app
 /// Uses the hub icon as the primary brand element
@@ -27,7 +27,7 @@ class BrandService {
   }) {
     final palette = _resolvePalette(context);
     final resolvedBrightness = brightness ?? _resolveBrightness(context);
-    return palette.primaryFor(resolvedBrightness);
+    return palette.variantFor(resolvedBrightness).primary;
   }
 
   static Color secondaryBrandColor({
@@ -36,7 +36,7 @@ class BrandService {
   }) {
     final palette = _resolvePalette(context);
     final resolvedBrightness = brightness ?? _resolveBrightness(context);
-    return palette.secondaryFor(resolvedBrightness);
+    return palette.variantFor(resolvedBrightness).secondary;
   }
 
   static Color accentBrandColor({
@@ -45,7 +45,7 @@ class BrandService {
   }) {
     final palette = _resolvePalette(context);
     final resolvedBrightness = brightness ?? _resolveBrightness(context);
-    return palette.accentFor(resolvedBrightness);
+    return palette.variantFor(resolvedBrightness).accent;
   }
 
   /// Creates a branded icon with consistent styling
@@ -327,12 +327,12 @@ class BrandService {
     );
   }
 
-  static AppColorPalette _resolvePalette(BuildContext? context) {
+  static TweakcnThemeDefinition _resolvePalette(BuildContext? context) {
     if (context == null) {
-      return AppColorPalettes.auroraViolet;
+      return TweakcnThemes.t3Chat;
     }
     final extension = Theme.of(context).extension<AppPaletteThemeExtension>();
-    return extension?.palette ?? AppColorPalettes.auroraViolet;
+    return extension?.palette ?? TweakcnThemes.t3Chat;
   }
 
   static Brightness _resolveBrightness(BuildContext? context) {
@@ -343,7 +343,7 @@ class BrandService {
     final palette = _resolvePalette(context);
     final brightness = _resolveBrightness(context);
     return brightness == Brightness.dark
-        ? AppColorTokens.dark(palette: palette)
-        : AppColorTokens.light(palette: palette);
+        ? AppColorTokens.dark(theme: palette)
+        : AppColorTokens.light(theme: palette);
   }
 }

lib/shared/theme/app_theme.dart

@@ -4,255 +4,251 @@ import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_animate/flutter_animate.dart';
 import 'theme_extensions.dart';
-import 'color_palettes.dart';
+import 'tweakcn_themes.dart';
 import 'color_tokens.dart';
 
 class AppTheme {
-  // Enhanced neutral palette for better contrast (WCAG AA compliant)
-  static const Color neutral900 = Color(0xFF0B0E14);
-  static const Color neutral800 = Color(0xFF161B24);
-  static const Color neutral700 = Color(0xFF1F2531);
-  static const Color neutral600 = Color(0xFF343C4D);
-  static const Color neutral500 = Color(0xFF4A5161);
-  static const Color neutral400 = Color(0xFF9099AC);
-  static const Color neutral300 = Color(0xFFC5CCD9);
-  static const Color neutral200 = Color(0xFFE6EAF1);
-  static const Color neutral100 = Color(0xFFF5F7FA);
-  static const Color neutral50 = Color(0xFFFFFFFF);
-
-  // Semantic colors derived from the token specification
-  static const Color error = Color(0xFFCE2C31);
-  static const Color errorDark = Color(0xFFFF5F67);
-  static const Color success = Color(0xFF0E9D58);
-  static const Color successDark = Color(0xFF23C179);
-  static const Color warning = Color(0xFFDB7900);
-  static const Color warningDark = Color(0xFFFF9800);
-  static const Color info = Color(0xFF0174D3);
-  static const Color infoDark = Color(0xFF4CA8FF);
-
-  static ThemeData light(AppColorPalette palette) {
-    final lightTone = palette.light;
-    final tokens = AppColorTokens.light(palette: palette);
-    final colorScheme = tokens.toColorScheme().copyWith(
-      primary: lightTone.primary,
-      onPrimary: _pickOnColor(lightTone.primary, tokens),
-      secondary: lightTone.secondary,
-      onSecondary: _pickOnColor(lightTone.secondary, tokens),
-      tertiary: lightTone.accent,
-      onTertiary: _pickOnColor(lightTone.accent, tokens),
-      surfaceTint: lightTone.primary,
-    );
-
-    return ThemeData(
-      useMaterial3: true,
+  static ThemeData light(TweakcnThemeDefinition theme) {
+    final tokens = AppColorTokens.light(theme: theme);
+    return _buildTheme(
+      theme: theme,
+      tokens: tokens,
       brightness: Brightness.light,
-      colorScheme: colorScheme,
-      pageTransitionsTheme: _pageTransitionsTheme,
-      splashFactory: NoSplash.splashFactory,
-      scaffoldBackgroundColor: tokens.neutralTone10,
-      appBarTheme: AppBarTheme(
-        centerTitle: true,
-        elevation: Elevation.none,
-        backgroundColor: Colors.transparent,
-        foregroundColor: tokens.neutralOnSurface,
-      ),
-      bottomSheetTheme: BottomSheetThemeData(
-        backgroundColor: tokens.neutralTone00,
-        modalBackgroundColor: tokens.neutralTone00,
-        surfaceTintColor: Colors.transparent,
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.modal),
-        ),
-        showDragHandle: false,
-      ),
-      elevatedButtonTheme: ElevatedButtonThemeData(
-        style: ElevatedButton.styleFrom(
-          padding: const EdgeInsets.symmetric(
-            horizontal: Spacing.lg,
-            vertical: Spacing.xs,
-          ),
-          backgroundColor: lightTone.primary,
-          foregroundColor: _pickOnColor(lightTone.primary, tokens),
-          shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          ),
-        ),
-      ),
-      cardTheme: CardThemeData(
-        elevation: Elevation.none,
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.lg),
-          side: BorderSide(color: tokens.neutralTone20),
-        ),
-      ),
-      snackBarTheme: SnackBarThemeData(
-        behavior: SnackBarBehavior.floating,
-        backgroundColor: Color.alphaBlend(
-          tokens.overlayStrong,
-          tokens.neutralOnSurface,
-        ),
-        contentTextStyle: TextStyle(
-          color: tokens.neutralTone00,
-          fontSize: AppTypography.bodyMedium,
-        ),
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.snackbar),
-        ),
-        elevation: Elevation.high,
-      ),
-      inputDecorationTheme: InputDecorationTheme(
-        filled: true,
-        fillColor: tokens.neutralTone00,
-        border: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide.none,
-        ),
-        enabledBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide.none,
-        ),
-        focusedBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide(color: lightTone.primary, width: 2),
-        ),
-        errorBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide(color: tokens.statusError60, width: 1),
-        ),
-        contentPadding: const EdgeInsets.symmetric(
-          horizontal: Spacing.md,
-          vertical: Spacing.sm,
-        ),
-      ),
-      textTheme: ThemeData.light().textTheme,
-      extensions: <ThemeExtension<dynamic>>[
-        tokens,
-        ConduitThemeExtension.lightPalette(palette: palette, tokens: tokens),
-        AppPaletteThemeExtension(palette: palette),
-      ],
     );
   }
 
-  static ThemeData dark(AppColorPalette palette) {
-    final darkTone = palette.dark;
-    final tokens = AppColorTokens.dark(palette: palette);
-    final colorScheme = tokens.toColorScheme().copyWith(
-      primary: darkTone.primary,
-      onPrimary: _pickOnColor(darkTone.primary, tokens),
-      secondary: darkTone.secondary,
-      onSecondary: _pickOnColor(darkTone.secondary, tokens),
-      tertiary: darkTone.accent,
-      onTertiary: _pickOnColor(darkTone.accent, tokens),
-      surfaceTint: darkTone.primary,
-    );
-
-    return ThemeData(
-      useMaterial3: true,
+  static ThemeData dark(TweakcnThemeDefinition theme) {
+    final tokens = AppColorTokens.dark(theme: theme);
+    return _buildTheme(
+      theme: theme,
+      tokens: tokens,
       brightness: Brightness.dark,
-      colorScheme: colorScheme,
-      scaffoldBackgroundColor: tokens.neutralTone10,
-      pageTransitionsTheme: _pageTransitionsTheme,
-      splashFactory: NoSplash.splashFactory,
-      appBarTheme: AppBarTheme(
-        centerTitle: true,
-        elevation: Elevation.none,
-        backgroundColor: Colors.transparent,
-        foregroundColor: tokens.neutralOnSurface,
-      ),
-      bottomSheetTheme: BottomSheetThemeData(
-        backgroundColor: tokens.neutralTone00,
-        modalBackgroundColor: tokens.neutralTone00,
-        surfaceTintColor: Colors.transparent,
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.modal),
-        ),
-        showDragHandle: false,
-      ),
-      elevatedButtonTheme: ElevatedButtonThemeData(
-        style: ElevatedButton.styleFrom(
-          padding: const EdgeInsets.symmetric(
-            horizontal: Spacing.lg,
-            vertical: Spacing.xs,
-          ),
-          backgroundColor: darkTone.primary,
-          foregroundColor: _pickOnColor(darkTone.primary, tokens),
-          shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          ),
-        ),
-      ),
-      cardTheme: CardThemeData(
-        elevation: Elevation.none,
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.lg),
-          side: BorderSide(color: tokens.neutralTone40),
-        ),
-      ),
-      snackBarTheme: SnackBarThemeData(
-        behavior: SnackBarBehavior.floating,
-        backgroundColor: Color.alphaBlend(
-          tokens.overlayStrong,
-          tokens.neutralTone20,
-        ),
-        contentTextStyle: TextStyle(
-          color: tokens.neutralOnSurface,
-          fontSize: AppTypography.bodyMedium,
-        ),
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.snackbar),
-        ),
-        elevation: Elevation.high,
-      ),
-      inputDecorationTheme: InputDecorationTheme(
-        filled: true,
-        fillColor: tokens.neutralTone20,
-        border: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide(color: tokens.neutralTone40, width: 1),
-        ),
-        enabledBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide(color: tokens.neutralTone40, width: 1),
-        ),
-        focusedBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide(color: darkTone.primary, width: 2),
-        ),
-        errorBorder: OutlineInputBorder(
-          borderRadius: BorderRadius.circular(AppBorderRadius.md),
-          borderSide: BorderSide(color: tokens.statusError60, width: 1),
-        ),
-        contentPadding: const EdgeInsets.symmetric(
-          horizontal: Spacing.md,
-          vertical: Spacing.sm,
-        ),
-      ),
-      textTheme: ThemeData.dark().textTheme,
-      extensions: <ThemeExtension<dynamic>>[
-        tokens,
-        ConduitThemeExtension.darkPalette(palette: palette, tokens: tokens),
-        AppPaletteThemeExtension(palette: palette),
-      ],
     );
   }
 
   static CupertinoThemeData cupertinoTheme(
     BuildContext context,
-    AppColorPalette palette,
+    TweakcnThemeDefinition theme,
   ) {
     final brightness = Theme.of(context).brightness;
-    final tone = palette.toneFor(brightness);
+    final variant = theme.variantFor(brightness);
     final tokens = brightness == Brightness.dark
-        ? AppColorTokens.dark(palette: palette)
-        : AppColorTokens.light(palette: palette);
+        ? AppColorTokens.dark(theme: theme)
+        : AppColorTokens.light(theme: theme);
     return CupertinoThemeData(
       brightness: brightness,
-      primaryColor: tone.primary,
+      primaryColor: variant.primary,
       scaffoldBackgroundColor: tokens.neutralTone10,
       barBackgroundColor: tokens.neutralTone10,
     );
   }
 
+  static ThemeData _buildTheme({
+    required TweakcnThemeDefinition theme,
+    required AppColorTokens tokens,
+    required Brightness brightness,
+  }) {
+    final variant = theme.variantFor(brightness);
+    final isDark = brightness == Brightness.dark;
+    final typography = TypographyThemeExtension.fromVariant(variant);
+    final surfaces = SurfaceThemeExtension.fromVariant(variant);
+    final shadows = ShadowThemeExtension.standard();
+    final shapes = ShapeThemeExtension.fromVariant(variant);
+    final sidebar = SidebarThemeExtension.fromVariant(variant);
+    final conduitExtension = ConduitThemeExtension.create(
+      theme: theme,
+      tokens: tokens,
+      brightness: brightness,
+      typography: typography,
+      surfaces: surfaces,
+      shadows: shadows,
+      shapes: shapes,
+    );
+    final colorScheme = tokens.toColorScheme().copyWith(
+      primary: variant.primary,
+      onPrimary: _pickOnColor(variant.primary, tokens),
+      secondary: variant.secondary,
+      onSecondary: _pickOnColor(variant.secondary, tokens),
+      tertiary: variant.accent,
+      onTertiary: _pickOnColor(variant.accent, tokens),
+      surfaceTint: variant.primary,
+    );
+
+    final OutlineInputBorder baseInputBorder = OutlineInputBorder(
+      borderRadius: shapes.medium,
+      borderSide: BorderSide(
+        color: isDark
+            ? Color.lerp(surfaces.border, surfaces.input, 0.6)!
+            : Color.lerp(surfaces.border, surfaces.input, 0.4)!,
+        width: 1,
+      ),
+    );
+
+    final TextTheme baseTextTheme = brightness == Brightness.dark
+        ? ThemeData.dark().textTheme
+        : ThemeData.light().textTheme;
+    final TextTheme textTheme = baseTextTheme.apply(
+      fontFamily: typography.primaryFont.isEmpty
+          ? null
+          : typography.primaryFont,
+      fontFamilyFallback: typography.primaryFallback.isEmpty
+          ? null
+          : typography.primaryFallback,
+    );
+
+    return ThemeData(
+      useMaterial3: true,
+      brightness: brightness,
+      fontFamily: typography.primaryFont.isEmpty
+          ? null
+          : typography.primaryFont,
+      fontFamilyFallback: typography.primaryFallback.isEmpty
+          ? null
+          : typography.primaryFallback,
+      colorScheme: colorScheme,
+      scaffoldBackgroundColor: surfaces.background,
+      canvasColor: surfaces.background,
+      pageTransitionsTheme: _pageTransitionsTheme,
+      splashFactory: NoSplash.splashFactory,
+      appBarTheme: AppBarTheme(
+        centerTitle: true,
+        elevation: Elevation.none,
+        backgroundColor: surfaces.background,
+        foregroundColor: tokens.neutralOnSurface,
+      ),
+      bottomSheetTheme: BottomSheetThemeData(
+        backgroundColor: surfaces.card,
+        modalBackgroundColor: surfaces.card,
+        surfaceTintColor: surfaces.card,
+        shape: RoundedRectangleBorder(borderRadius: shapes.extraLarge),
+        showDragHandle: false,
+      ),
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          padding: const EdgeInsets.symmetric(
+            horizontal: Spacing.lg,
+            vertical: Spacing.xs,
+          ),
+          backgroundColor: variant.primary,
+          foregroundColor: _pickOnColor(variant.primary, tokens),
+          shape: RoundedRectangleBorder(borderRadius: shapes.medium),
+          elevation: Elevation.low,
+          shadowColor: shadows.shadowSm.first.color,
+        ),
+      ),
+      cardTheme: CardThemeData(
+        color: surfaces.card,
+        elevation: Elevation.low,
+        shape: RoundedRectangleBorder(
+          borderRadius: shapes.large,
+          side: BorderSide(color: surfaces.border),
+        ),
+        shadowColor: shadows.shadowSm.first.color,
+        surfaceTintColor: Colors.transparent,
+      ),
+      snackBarTheme: SnackBarThemeData(
+        behavior: SnackBarBehavior.floating,
+        backgroundColor: conduitExtension.statusPalette.info.base,
+        contentTextStyle: textTheme.bodyMedium?.copyWith(
+          color: conduitExtension.statusPalette.info.onBase,
+        ),
+        actionTextColor: conduitExtension.statusPalette.info.onBase,
+        shape: RoundedRectangleBorder(borderRadius: shapes.medium),
+        elevation: Elevation.low,
+        insetPadding: const EdgeInsets.all(Spacing.md),
+      ),
+      inputDecorationTheme: InputDecorationTheme(
+        filled: true,
+        fillColor: conduitExtension.inputBackground,
+        focusColor: surfaces.ring,
+        hoverColor: Color.alphaBlend(
+          shadows.shadowXs.first.color,
+          conduitExtension.inputBackground,
+        ),
+        border: baseInputBorder,
+        enabledBorder: baseInputBorder,
+        focusedBorder: baseInputBorder.copyWith(
+          borderSide: BorderSide(color: surfaces.ring, width: 2),
+        ),
+        errorBorder: baseInputBorder.copyWith(
+          borderSide: BorderSide(color: tokens.statusError60, width: 1),
+        ),
+        contentPadding: const EdgeInsets.symmetric(
+          horizontal: Spacing.md,
+          vertical: Spacing.sm,
+        ),
+      ),
+      chipTheme: ChipThemeData(
+        shape: RoundedRectangleBorder(borderRadius: shapes.medium),
+        padding: const EdgeInsets.symmetric(
+          horizontal: Spacing.sm,
+          vertical: Spacing.xs,
+        ),
+        backgroundColor: Color.lerp(surfaces.card, surfaces.muted, 0.4)!,
+        disabledColor: Color.alphaBlend(
+          shadows.shadowXs.first.color,
+          surfaces.card,
+        ),
+        selectedColor: conduitExtension.statusPalette.success.background,
+        secondarySelectedColor: conduitExtension.statusPalette.info.background,
+        shadowColor: shadows.shadowSm.first.color,
+        selectedShadowColor: shadows.shadowSm.first.color,
+        brightness: brightness,
+        labelStyle: textTheme.bodySmall?.copyWith(
+          color: tokens.neutralOnSurface,
+        ),
+        secondaryLabelStyle: textTheme.bodySmall?.copyWith(
+          color: conduitExtension.statusPalette.info.onBase,
+        ),
+        side: BorderSide(color: surfaces.border),
+      ),
+      badgeTheme: BadgeThemeData(
+        backgroundColor: conduitExtension.statusPalette.info.base,
+        textColor: conduitExtension.statusPalette.info.onBase,
+        padding: const EdgeInsets.symmetric(
+          horizontal: Spacing.xs,
+          vertical: Spacing.xxs,
+        ),
+        largeSize: 24,
+        smallSize: 18,
+      ),
+      dialogTheme: DialogThemeData(
+        backgroundColor: surfaces.popover,
+        surfaceTintColor: Colors.transparent,
+        elevation: Elevation.medium,
+        shadowColor: shadows.shadowLg.first.color,
+        shape: RoundedRectangleBorder(borderRadius: shapes.large),
+        titleTextStyle: textTheme.titleLarge?.copyWith(
+          color: surfaces.popoverForeground,
+        ),
+        contentTextStyle: textTheme.bodyMedium?.copyWith(
+          color: tokens.neutralOnSurface,
+        ),
+      ),
+      listTileTheme: ListTileThemeData(
+        shape: RoundedRectangleBorder(borderRadius: shapes.medium),
+        tileColor: Color.lerp(surfaces.card, surfaces.muted, 0.25),
+        selectedTileColor: Color.alphaBlend(
+          conduitExtension.statusPalette.info.background,
+          surfaces.card,
+        ),
+        iconColor: tokens.neutralTone80,
+        textColor: tokens.neutralOnSurface,
+      ),
+      textTheme: textTheme,
+      extensions: <ThemeExtension<dynamic>>[
+        tokens,
+        typography,
+        surfaces,
+        shadows,
+        shapes,
+        sidebar,
+        conduitExtension,
+        AppPaletteThemeExtension(palette: theme),
+      ],
+    );
+  }
+
   static Color _pickOnColor(Color background, AppColorTokens tokens) {
     final contrastOnLight = _contrastRatio(background, tokens.neutralTone00);
     final contrastOnDark = _contrastRatio(background, tokens.neutralOnSurface);

lib/shared/theme/color_palettes.dart

@@ -1,159 +0,0 @@
-import 'package:flutter/material.dart';
-
-@immutable
-class AppPaletteTone {
-  const AppPaletteTone({
-    required this.primary,
-    required this.secondary,
-    required this.accent,
-  });
-
-  final Color primary;
-  final Color secondary;
-  final Color accent;
-}
-
-@immutable
-class AppColorPalette {
-  const AppColorPalette({
-    required this.id,
-    required this.label,
-    required this.description,
-    required this.light,
-    required this.dark,
-    this.preview,
-  });
-
-  final String id;
-  final String label;
-  final String description;
-  final AppPaletteTone light;
-  final AppPaletteTone dark;
-  final List<Color>? preview;
-}
-
-@immutable
-class AppPaletteThemeExtension
-    extends ThemeExtension<AppPaletteThemeExtension> {
-  const AppPaletteThemeExtension({required this.palette});
-
-  final AppColorPalette palette;
-
-  @override
-  AppPaletteThemeExtension copyWith({AppColorPalette? palette}) {
-    return AppPaletteThemeExtension(palette: palette ?? this.palette);
-  }
-
-  @override
-  AppPaletteThemeExtension lerp(
-    covariant ThemeExtension<AppPaletteThemeExtension>? other,
-    double t,
-  ) {
-    if (other is! AppPaletteThemeExtension) return this;
-    return t < 0.5 ? this : other;
-  }
-}
-
-class AppColorPalettes {
-  static const String defaultPaletteId = 'aurora_violet';
-
-  static const AppColorPalette auroraViolet = AppColorPalette(
-    id: defaultPaletteId,
-    label: 'Aurora Violet',
-    description: 'Bold purples inspired by aurora skies.',
-    light: AppPaletteTone(
-      primary: Color(0xFFA420FF),
-      secondary: Color(0xFFB058FF),
-      accent: Color(0xFFD9A5FF),
-    ),
-    dark: AppPaletteTone(
-      primary: Color(0xFF9500FF),
-      secondary: Color(0xFFC773FF),
-      accent: Color(0xFFE3BDFF),
-    ),
-    preview: [Color(0xFF9500FF), Color(0xFFA420FF), Color(0xFFB058FF)],
-  );
-
-  static const AppColorPalette emeraldRush = AppColorPalette(
-    id: 'emerald_rush',
-    label: 'Emerald Rush',
-    description: 'High-contrast greens with calm highlights.',
-    light: AppPaletteTone(
-      primary: Color(0xFF0C7F48),
-      secondary: Color(0xFF26A164),
-      accent: Color(0xFF6DE0A4),
-    ),
-    dark: AppPaletteTone(
-      primary: Color(0xFF40DD7F),
-      secondary: Color(0xFF26A164),
-      accent: Color(0xFF6DE0A4),
-    ),
-    preview: [Color(0xFF0C7F48), Color(0xFF26A164), Color(0xFF40DD7F)],
-  );
-
-  static const AppColorPalette azurePulse = AppColorPalette(
-    id: 'azure_pulse',
-    label: 'Azure Pulse',
-    description: 'Electric blues with crisp highlights.',
-    light: AppPaletteTone(
-      primary: Color(0xFF1B64DA),
-      secondary: Color(0xFF2E7AF0),
-      accent: Color(0xFF6DA6FF),
-    ),
-    dark: AppPaletteTone(
-      primary: Color(0xFF37C7FF),
-      secondary: Color(0xFF2E7AF0),
-      accent: Color(0xFF6DA6FF),
-    ),
-    preview: [Color(0xFF1B64DA), Color(0xFF2E7AF0), Color(0xFF37C7FF)],
-  );
-
-  static const AppColorPalette sunsetGlow = AppColorPalette(
-    id: 'sunset_glow',
-    label: 'Sunset Glow',
-    description: 'Warm oranges for energetic interfaces.',
-    light: AppPaletteTone(
-      primary: Color(0xFFB83200),
-      secondary: Color(0xFFE65100),
-      accent: Color(0xFFFFA05B),
-    ),
-    dark: AppPaletteTone(
-      primary: Color(0xFFFF8A00),
-      secondary: Color(0xFFE65100),
-      accent: Color(0xFFFFA05B),
-    ),
-    preview: [Color(0xFFB83200), Color(0xFFE65100), Color(0xFFFF8A00)],
-  );
-
-  static const List<AppColorPalette> all = [
-    auroraViolet,
-    emeraldRush,
-    azurePulse,
-    sunsetGlow,
-  ];
-
-  static AppColorPalette byId(String? id) {
-    return all.firstWhere(
-      (palette) => palette.id == id,
-      orElse: () => auroraViolet,
-    );
-  }
-}
-
-extension AppColorPaletteX on AppColorPalette {
-  AppPaletteTone toneFor(Brightness brightness) {
-    return brightness == Brightness.dark ? dark : light;
-  }
-
-  Color primaryFor(Brightness brightness) {
-    return toneFor(brightness).primary;
-  }
-
-  Color secondaryFor(Brightness brightness) {
-    return toneFor(brightness).secondary;
-  }
-
-  Color accentFor(Brightness brightness) {
-    return toneFor(brightness).accent;
-  }
-}

lib/shared/theme/color_tokens.dart

@@ -2,7 +2,7 @@ import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
 
-import 'color_palettes.dart';
+import 'tweakcn_themes.dart';
 
 /// Immutable set of semantic color tokens exposed through [ThemeExtension].
 ///
@@ -92,136 +92,118 @@ class AppColorTokens extends ThemeExtension<AppColorTokens> {
   final Color codeText;
   final Color codeAccent;
 
-  factory AppColorTokens.light({AppColorPalette? palette}) {
-    return AppColorTokens._fromPalette(
-      palette ?? AppColorPalettes.auroraViolet,
+  factory AppColorTokens.light({TweakcnThemeDefinition? theme}) {
+    return AppColorTokens._fromTheme(
+      theme ?? TweakcnThemes.conduit,
       Brightness.light,
     );
   }
 
-  factory AppColorTokens.dark({AppColorPalette? palette}) {
-    return AppColorTokens._fromPalette(
-      palette ?? AppColorPalettes.auroraViolet,
+  factory AppColorTokens.dark({TweakcnThemeDefinition? theme}) {
+    return AppColorTokens._fromTheme(
+      theme ?? TweakcnThemes.conduit,
       Brightness.dark,
     );
   }
 
-  factory AppColorTokens._fromPalette(
-    AppColorPalette palette,
+  factory AppColorTokens._fromTheme(
+    TweakcnThemeDefinition theme,
     Brightness brightness,
   ) {
-    final AppPaletteTone tone = palette.toneFor(brightness);
-
+    final TweakcnThemeVariant variant = theme.variantFor(brightness);
     final bool isLight = brightness == Brightness.light;
 
-    final Color neutralTone00 = isLight
-        ? const Color(0xFFFFFFFF)
-        : const Color(0xFF0B0E14);
-    final Color neutralTone10 = isLight
-        ? const Color(0xFFF5F7FA)
-        : const Color(0xFF161B24);
-    final Color neutralTone20 = isLight
-        ? const Color(0xFFE6EAF1)
-        : const Color(0xFF1F2531);
-    final Color neutralTone40 = isLight
-        ? const Color(0xFFC5CCD9)
-        : const Color(0xFF343C4D);
-    final Color neutralTone60 = isLight
-        ? const Color(0xFF9099AC)
-        : const Color(0xFF4C566A);
-    final Color neutralTone80 = isLight
-        ? const Color(0xFF4A5161)
-        : const Color(0xFF8B95AA);
-    final Color neutralOnSurface = isLight
-        ? const Color(0xFF151920)
-        : const Color(0xFFE8ECF5);
-
-    final Color overlayWeak = isLight
-        ? const Color.fromRGBO(21, 25, 32, 0.08)
-        : const Color.fromRGBO(232, 236, 245, 0.08);
-    final Color overlayMedium = isLight
-        ? const Color.fromRGBO(21, 25, 32, 0.16)
-        : const Color.fromRGBO(232, 236, 245, 0.16);
-    final Color overlayStrong = isLight
-        ? const Color.fromRGBO(21, 25, 32, 0.32)
-        : const Color.fromRGBO(232, 236, 245, 0.48);
-
-    final ColorScheme seedScheme = ColorScheme.fromSeed(
-      seedColor: tone.primary,
-      brightness: brightness,
+    final Color neutralTone00 = variant.background;
+    final Color neutralTone20 = variant.card;
+    final Color neutralTone10 = mix(neutralTone00, neutralTone20, 0.5);
+    final Color neutralTone40 = variant.muted;
+    final Color neutralTone60 = mix(
+      variant.mutedForeground,
+      variant.foreground,
+      isLight ? 0.25 : 0.4,
+    );
+    final Color neutralTone80 = mix(
+      variant.foreground,
+      isLight ? Colors.black : Colors.white,
+      isLight ? 0.06 : 0.3,
+    );
+    final Color neutralOnSurface = _ensureContrast(
+      surface: neutralTone00,
+      foreground: variant.foreground,
+      minContrast: 4.5,
     );
 
-    final Color brandTone60 = seedScheme.primary;
-    final Color brandOn60 = _preferredOnColor(
-      background: brandTone60,
-      light: neutralTone00,
-      dark: neutralOnSurface,
+    final Color brandTone60 = variant.primary;
+    final Color brandOn60 = _ensureContrast(
+      surface: brandTone60,
+      foreground: variant.primaryForeground,
+    );
+    final Color brandTone90 = mix(
+      variant.primary,
+      neutralTone00,
+      isLight ? 0.7 : 0.3,
+    );
+    final Color brandOn90 = _ensureContrast(
+      surface: brandTone90,
+      foreground: brandOn60,
+    );
+    final Color brandTone40 = mix(
+      variant.primary,
+      neutralOnSurface,
+      isLight ? 0.35 : 0.55,
     );
 
-    final Color brandTone90 = seedScheme.primaryContainer;
-    final Color brandOn90 = _preferredOnColor(
-      background: brandTone90,
-      light: neutralTone00,
-      dark: neutralOnSurface,
+    final Color accentIndigo60 = variant.secondary;
+    final Color accentOnIndigo60 = _ensureContrast(
+      surface: accentIndigo60,
+      foreground: variant.secondaryForeground,
+    );
+    final Color accentTeal60 = variant.accent;
+    final Color accentGold60 = mix(
+      variant.accent,
+      isLight ? Colors.white : Colors.black,
+      isLight ? 0.18 : 0.24,
     );
 
-    final double brandShift = isLight ? 0.18 : -0.14;
-    final Color brandTone40 = _shiftLightness(brandTone60, brandShift);
-
-    final Color accentIndigo60 = tone.secondary;
-    final Color accentOnIndigo60 = _preferredOnColor(
-      background: accentIndigo60,
-      light: neutralTone00,
-      dark: neutralOnSurface,
+    final Color statusError60 = variant.destructive;
+    final Color statusOnError60 = _ensureContrast(
+      surface: statusError60,
+      foreground: variant.destructiveForeground,
+    );
+    final Color statusSuccess60 = variant.success;
+    final Color statusOnSuccess60 = _ensureContrast(
+      surface: statusSuccess60,
+      foreground: variant.successForeground,
+    );
+    final Color statusWarning60 = variant.warning;
+    final Color statusOnWarning60 = _ensureContrast(
+      surface: statusWarning60,
+      foreground: variant.warningForeground,
+    );
+    final Color statusInfo60 = variant.info;
+    final Color statusOnInfo60 = _ensureContrast(
+      surface: statusInfo60,
+      foreground: variant.infoForeground,
     );
 
-    final Color accentTeal60 = tone.accent;
-    final Color accentGold60 = isLight
-        ? const Color(0xFFFFB54A)
-        : const Color(0xFFFFC266);
-
-    final Color statusSuccess60 = isLight
-        ? const Color(0xFF0E9D58)
-        : const Color(0xFF23C179);
-    final Color statusOnSuccess60 = _preferredOnColor(
-      background: statusSuccess60,
-      light: neutralTone00,
-      dark: neutralOnSurface,
+    final Color overlayWeak = neutralOnSurface.withValues(
+      alpha: isLight ? 0.08 : 0.12,
+    );
+    final Color overlayMedium = neutralOnSurface.withValues(
+      alpha: isLight ? 0.16 : 0.2,
+    );
+    final Color overlayStrong = neutralOnSurface.withValues(
+      alpha: isLight ? 0.32 : 0.36,
     );
 
-    final Color statusWarning60 = isLight
-        ? const Color(0xFFDB7900)
-        : const Color(0xFFFF9800);
-    final Color statusOnWarning60 = _preferredOnColor(
-      background: statusWarning60,
-      light: neutralTone00,
-      dark: neutralOnSurface,
+    final Color codeBackground = mix(variant.muted, neutralTone00, 0.5);
+    final Color codeBorder = mix(variant.border, neutralTone40, 0.6);
+    final Color codeText = _ensureContrast(
+      surface: codeBackground,
+      foreground: neutralOnSurface,
+      minContrast: 4.5,
     );
-
-    final Color statusError60 = isLight
-        ? const Color(0xFFCE2C31)
-        : const Color(0xFFFF5F67);
-    final Color statusOnError60 = _preferredOnColor(
-      background: statusError60,
-      light: neutralTone00,
-      dark: neutralOnSurface,
-    );
-
-    final Color statusInfo60 = isLight
-        ? const Color(0xFF0174D3)
-        : const Color(0xFF4CA8FF);
-    final Color statusOnInfo60 = _preferredOnColor(
-      background: statusInfo60,
-      light: neutralTone00,
-      dark: neutralOnSurface,
-    );
-
-    final Color codeBackground = isLight ? neutralTone10 : neutralTone00;
-    final Color codeBorder = isLight ? neutralTone20 : neutralTone40;
-    final Color codeText = neutralOnSurface;
-    final Color codeAccent = isLight
-        ? Color.alphaBlend(brandTone60.withValues(alpha: 0.14), codeBackground)
-        : Color.alphaBlend(brandTone40.withValues(alpha: 0.24), codeBackground);
+    final Color codeAccent = mix(variant.accent, variant.primary, 0.4);
 
     return AppColorTokens(
       brightness: brightness,
@@ -406,7 +388,10 @@ class AppColorTokens extends ThemeExtension<AppColorTokens> {
       secondary: accentIndigo60,
       onSecondary: accentOnIndigo60,
       tertiary: accentTeal60,
-      onTertiary: neutralTone00,
+      onTertiary: _ensureContrast(
+        surface: accentTeal60,
+        foreground: neutralTone00,
+      ),
       surface: neutralTone00,
       surfaceContainerLow: neutralTone10,
       surfaceContainerHighest: neutralTone20,
@@ -433,20 +418,24 @@ class AppColorTokens extends ThemeExtension<AppColorTokens> {
         : AppColorTokens.light();
   }
 
-  static Color _shiftLightness(Color color, double amount) {
-    final HSLColor hsl = HSLColor.fromColor(color);
-    final double lightness = (hsl.lightness + amount).clamp(0.0, 1.0);
-    return hsl.withLightness(lightness).toColor();
-  }
-
-  static Color _preferredOnColor({
-    required Color background,
-    required Color light,
-    required Color dark,
+  static Color _ensureContrast({
+    required Color surface,
+    required Color foreground,
+    double minContrast = 4.5,
   }) {
-    final double lightContrast = _contrastRatio(background, light);
-    final double darkContrast = _contrastRatio(background, dark);
-    return lightContrast >= darkContrast ? light : dark;
+    if (_contrastRatio(surface, foreground) >= minContrast) {
+      return foreground;
+    }
+    final bool surfaceIsDark = surface.computeLuminance() < 0.5;
+    final Color target = surfaceIsDark ? Colors.white : Colors.black;
+    Color candidate = foreground;
+    for (var i = 0; i < 6; i++) {
+      candidate = Color.lerp(candidate, target, 0.3)!;
+      if (_contrastRatio(surface, candidate) >= minContrast) {
+        return candidate;
+      }
+    }
+    return target;
   }
 
   static double _contrastRatio(Color a, Color b) {

lib/shared/theme/tweakcn_themes.dart

@@ -0,0 +1,386 @@
+import 'package:flutter/material.dart';
+
+/// Represents a single tweakcn theme variant (light or dark) and exposes the
+/// standard set of color tokens defined by the registry.
+@immutable
+class TweakcnThemeVariant {
+  const TweakcnThemeVariant({
+    required this.background,
+    required this.foreground,
+    required this.card,
+    required this.cardForeground,
+    required this.popover,
+    required this.popoverForeground,
+    required this.primary,
+    required this.primaryForeground,
+    required this.secondary,
+    required this.secondaryForeground,
+    required this.muted,
+    required this.mutedForeground,
+    required this.accent,
+    required this.accentForeground,
+    required this.destructive,
+    required this.destructiveForeground,
+    required this.border,
+    required this.input,
+    required this.ring,
+    required this.sidebarBackground,
+    required this.sidebarForeground,
+    required this.sidebarPrimary,
+    required this.sidebarPrimaryForeground,
+    required this.sidebarAccent,
+    required this.sidebarAccentForeground,
+    required this.sidebarBorder,
+    required this.sidebarRing,
+    required this.success,
+    required this.successForeground,
+    required this.warning,
+    required this.warningForeground,
+    required this.info,
+    required this.infoForeground,
+    this.radius = 16,
+    this.fontSans = const <String>[],
+    this.fontSerif = const <String>[],
+    this.fontMono = const <String>[],
+  });
+
+  final Color background;
+  final Color foreground;
+  final Color card;
+  final Color cardForeground;
+  final Color popover;
+  final Color popoverForeground;
+  final Color primary;
+  final Color primaryForeground;
+  final Color secondary;
+  final Color secondaryForeground;
+  final Color muted;
+  final Color mutedForeground;
+  final Color accent;
+  final Color accentForeground;
+  final Color destructive;
+  final Color destructiveForeground;
+  final Color border;
+  final Color input;
+  final Color ring;
+  final Color sidebarBackground;
+  final Color sidebarForeground;
+  final Color sidebarPrimary;
+  final Color sidebarPrimaryForeground;
+  final Color sidebarAccent;
+  final Color sidebarAccentForeground;
+  final Color sidebarBorder;
+  final Color sidebarRing;
+  final Color success;
+  final Color successForeground;
+  final Color warning;
+  final Color warningForeground;
+  final Color info;
+  final Color infoForeground;
+  final double radius;
+  final List<String> fontSans;
+  final List<String> fontSerif;
+  final List<String> fontMono;
+}
+
+/// Definition of a tweakcn theme that provides both light and dark variants.
+@immutable
+class TweakcnThemeDefinition {
+  const TweakcnThemeDefinition({
+    required this.id,
+    required this.label,
+    required this.description,
+    required this.light,
+    required this.dark,
+    required this.preview,
+  });
+
+  final String id;
+  final String label;
+  final String description;
+  final TweakcnThemeVariant light;
+  final TweakcnThemeVariant dark;
+  final List<Color> preview;
+
+  TweakcnThemeVariant variantFor(Brightness brightness) {
+    return brightness == Brightness.dark ? dark : light;
+  }
+}
+
+Color mix(Color a, Color b, double amount) {
+  return Color.lerp(a, b, amount.clamp(0.0, 1.0)) ?? a;
+}
+
+class TweakcnThemes {
+  static final TweakcnThemeVariant _conduitLight = TweakcnThemeVariant(
+    background: const Color(0xFFFFFFFF),
+    foreground: const Color(0xFF0A0A0A),
+    card: const Color(0xFFFFFFFF),
+    cardForeground: const Color(0xFF0A0A0A),
+    popover: const Color(0xFFFFFFFF),
+    popoverForeground: const Color(0xFF0A0A0A),
+    primary: const Color(0xFF171717),
+    primaryForeground: const Color(0xFFFAFAFA),
+    secondary: const Color(0xFFF5F5F5),
+    secondaryForeground: const Color(0xFF171717),
+    muted: const Color(0xFFF5F5F5),
+    mutedForeground: const Color(0xFF737373),
+    accent: const Color(0xFFF5F5F5),
+    accentForeground: const Color(0xFF171717),
+    destructive: const Color(0xFFE7000B),
+    destructiveForeground: const Color(0xFFFAFAFA),
+    border: const Color(0xFFE5E5E5),
+    input: const Color(0xFFE5E5E5),
+    ring: const Color(0xFFA1A1A1),
+    sidebarBackground: const Color(0xFFFAFAFA),
+    sidebarForeground: const Color(0xFF0A0A0A),
+    sidebarPrimary: const Color(0xFF171717),
+    sidebarPrimaryForeground: const Color(0xFFFAFAFA),
+    sidebarAccent: const Color(0xFFF5F5F5),
+    sidebarAccentForeground: const Color(0xFF171717),
+    sidebarBorder: const Color(0xFFE5E5E5),
+    sidebarRing: const Color(0xFFA1A1A1),
+    success: const Color(0xFF00E6C7),
+    successForeground: const Color(0xFF09090B),
+    warning: const Color(0xFFF97316),
+    warningForeground: const Color(0xFF09090B),
+    info: const Color(0xFF2563EB),
+    infoForeground: const Color(0xFFFAFAFA),
+    radius: 10,
+    fontSans: const <String>[
+      'ui-sans-serif',
+      'system-ui',
+      '-apple-system',
+      'BlinkMacSystemFont',
+      'Segoe UI',
+      'Roboto',
+      'Helvetica Neue',
+      'Arial',
+      'Noto Sans',
+      'sans-serif',
+      'Apple Color Emoji',
+      'Segoe UI Emoji',
+      'Segoe UI Symbol',
+      'Noto Color Emoji',
+    ],
+    fontSerif: const <String>[
+      'ui-serif',
+      'Georgia',
+      'Cambria',
+      'Times New Roman',
+      'Times',
+      'serif',
+    ],
+    fontMono: const <String>[
+      'ui-monospace',
+      'SFMono-Regular',
+      'SF Mono',
+      'Menlo',
+      'Monaco',
+      'Consolas',
+      'Liberation Mono',
+      'Courier New',
+      'monospace',
+    ],
+  );
+
+  static final TweakcnThemeVariant _conduitDark = TweakcnThemeVariant(
+    background: const Color(0xFF0A0A0A),
+    foreground: const Color(0xFFFAFAFA),
+    card: const Color(0xFF171717),
+    cardForeground: const Color(0xFFFAFAFA),
+    popover: const Color(0xFF262626),
+    popoverForeground: const Color(0xFFFAFAFA),
+    primary: const Color(0xFFE5E5E5),
+    primaryForeground: const Color(0xFF171717),
+    secondary: const Color(0xFF262626),
+    secondaryForeground: const Color(0xFFFAFAFA),
+    muted: const Color(0xFF262626),
+    mutedForeground: const Color(0xFFA1A1AA),
+    accent: const Color(0xFF404040),
+    accentForeground: const Color(0xFFFAFAFA),
+    destructive: const Color(0xFFFF6467),
+    destructiveForeground: const Color(0xFFFAFAFA),
+    border: const Color(0xFF282828),
+    input: const Color(0xFF343434),
+    ring: const Color(0xFF737373),
+    sidebarBackground: const Color(0xFF171717),
+    sidebarForeground: const Color(0xFFFAFAFA),
+    sidebarPrimary: const Color(0xFF1447E6),
+    sidebarPrimaryForeground: const Color(0xFFFAFAFA),
+    sidebarAccent: const Color(0xFF262626),
+    sidebarAccentForeground: const Color(0xFFFAFAFA),
+    sidebarBorder: const Color(0xFF282828),
+    sidebarRing: const Color(0xFF525252),
+    success: const Color(0xFF00E6C7),
+    successForeground: const Color(0xFF09090B),
+    warning: const Color(0xFFF97316),
+    warningForeground: const Color(0xFF09090B),
+    info: const Color(0xFF2563EB),
+    infoForeground: const Color(0xFFFAFAFA),
+    radius: 10,
+    fontSans: const <String>[
+      'ui-sans-serif',
+      'system-ui',
+      '-apple-system',
+      'BlinkMacSystemFont',
+      'Segoe UI',
+      'Roboto',
+      'Helvetica Neue',
+      'Arial',
+      'Noto Sans',
+      'sans-serif',
+      'Apple Color Emoji',
+      'Segoe UI Emoji',
+      'Segoe UI Symbol',
+      'Noto Color Emoji',
+    ],
+    fontSerif: const <String>[
+      'ui-serif',
+      'Georgia',
+      'Cambria',
+      'Times New Roman',
+      'Times',
+      'serif',
+    ],
+    fontMono: const <String>[
+      'ui-monospace',
+      'SFMono-Regular',
+      'SF Mono',
+      'Menlo',
+      'Monaco',
+      'Consolas',
+      'Liberation Mono',
+      'Courier New',
+      'monospace',
+    ],
+  );
+
+  static final TweakcnThemeVariant _t3ChatLight = TweakcnThemeVariant(
+    background: const Color(0xFFFAF5FA),
+    foreground: const Color(0xFF501854),
+    card: const Color(0xFFFAF5FA),
+    cardForeground: const Color(0xFF501854),
+    popover: const Color(0xFFFFFFFF),
+    popoverForeground: const Color(0xFF501854),
+    primary: const Color(0xFFA84370),
+    primaryForeground: const Color(0xFFFFFFFF),
+    secondary: const Color(0xFFF1C4E6),
+    secondaryForeground: const Color(0xFF77347C),
+    muted: const Color(0xFFF6E5F3),
+    mutedForeground: const Color(0xFF834588),
+    accent: const Color(0xFFF1C4E6),
+    accentForeground: const Color(0xFF77347C),
+    destructive: const Color(0xFFAB4347),
+    destructiveForeground: const Color(0xFFFFFFFF),
+    border: const Color(0xFFEFBDEB),
+    input: const Color(0xFFE7C1DC),
+    ring: const Color(0xFFDB2777),
+    sidebarBackground: const Color(0xFFF3E4F6),
+    sidebarForeground: const Color(0xFFAC1668),
+    sidebarPrimary: const Color(0xFF454554),
+    sidebarPrimaryForeground: const Color(0xFFFAF1F7),
+    sidebarAccent: const Color(0xFFF8F8F7),
+    sidebarAccentForeground: const Color(0xFF454554),
+    sidebarBorder: const Color(0xFFECEAE9),
+    sidebarRing: const Color(0xFFDB2777),
+    success: const Color(0xFFF4A462),
+    successForeground: const Color(0xFF501854),
+    warning: const Color(0xFFE8C468),
+    warningForeground: const Color(0xFF501854),
+    info: const Color(0xFF6C12B9),
+    infoForeground: const Color(0xFFF8F1F5),
+    radius: 8,
+  );
+
+  static final TweakcnThemeVariant _t3ChatDark = TweakcnThemeVariant(
+    background: const Color(0xFF221D27),
+    foreground: const Color(0xFFD2C4DE),
+    card: const Color(0xFF2C2632),
+    cardForeground: const Color(0xFFDBC5D2),
+    popover: const Color(0xFF100A0E),
+    popoverForeground: const Color(0xFFF8F1F5),
+    primary: const Color(0xFFA3004C),
+    primaryForeground: const Color(0xFFEFC0D8),
+    secondary: const Color(0xFF362D3D),
+    secondaryForeground: const Color(0xFFD4C7E1),
+    muted: const Color(0xFF28222D),
+    mutedForeground: const Color(0xFFC2B6CF),
+    accent: const Color(0xFF463753),
+    accentForeground: const Color(0xFFF8F1F5),
+    destructive: const Color(0xFF301015),
+    destructiveForeground: const Color(0xFFFFFFFF),
+    border: const Color(0xFF3B3237),
+    input: const Color(0xFF3E343C),
+    ring: const Color(0xFFDB2777),
+    sidebarBackground: const Color(0xFF181117),
+    sidebarForeground: const Color(0xFFE0CAD6),
+    sidebarPrimary: const Color(0xFF1D4ED8),
+    sidebarPrimaryForeground: const Color(0xFFFFFFFF),
+    sidebarAccent: const Color(0xFF261922),
+    sidebarAccentForeground: const Color(0xFFF4F4F5),
+    sidebarBorder: const Color(0xFF000000),
+    sidebarRing: const Color(0xFFDB2777),
+    success: const Color(0xFFE88C30),
+    successForeground: const Color(0xFF181117),
+    warning: const Color(0xFFAF57DB),
+    warningForeground: const Color(0xFF181117),
+    info: const Color(0xFF934DCB),
+    infoForeground: const Color(0xFFF8F1F5),
+    radius: 8,
+  );
+
+  static final TweakcnThemeDefinition t3Chat = TweakcnThemeDefinition(
+    id: 't3_chat',
+    label: 'T3 Chat',
+    description: 'Playful gradients inspired by the T3 Stack brand.',
+    light: _t3ChatLight,
+    dark: _t3ChatDark,
+    preview: const <Color>[
+      Color(0xFFA84370),
+      Color(0xFFF1C4E6),
+      Color(0xFFDB2777),
+    ],
+  );
+
+  static final TweakcnThemeDefinition conduit = TweakcnThemeDefinition(
+    id: 'conduit',
+    label: 'Conduit',
+    description: 'Clean neutral theme designed for Conduit.',
+    light: _conduitLight,
+    dark: _conduitDark,
+    preview: const <Color>[
+      Color(0xFFA1A1AA),
+      Color(0xFFF4F4F5),
+      Color(0xFF2563EB),
+    ],
+  );
+
+  static List<TweakcnThemeDefinition> all = [conduit, t3Chat];
+
+  static TweakcnThemeDefinition byId(String? id) {
+    return all.firstWhere((theme) => theme.id == id, orElse: () => conduit);
+  }
+}
+
+@immutable
+class AppPaletteThemeExtension
+    extends ThemeExtension<AppPaletteThemeExtension> {
+  const AppPaletteThemeExtension({required this.palette});
+
+  final TweakcnThemeDefinition palette;
+
+  @override
+  AppPaletteThemeExtension copyWith({TweakcnThemeDefinition? palette}) {
+    return AppPaletteThemeExtension(palette: palette ?? this.palette);
+  }
+
+  @override
+  AppPaletteThemeExtension lerp(
+    covariant ThemeExtension<AppPaletteThemeExtension>? other,
+    double t,
+  ) {
+    if (other is! AppPaletteThemeExtension) return this;
+    return t < 0.5 ? this : other;
+  }
+}

lib/shared/utils/conversation_context_menu.dart

@@ -57,13 +57,15 @@ Future<void> showConduitContextMenu({
                 isCompact: true,
                 leading: Icon(
                   Platform.isIOS ? action.cupertinoIcon : action.materialIcon,
-                  color: action.destructive ? theme.error : theme.iconPrimary,
+                  color: action.destructive ? Colors.red : theme.iconPrimary,
                   size: IconSize.modal,
                 ),
                 title: Text(
                   action.label,
                   style: AppTypography.standard.copyWith(
-                    color: action.destructive ? theme.error : theme.textPrimary,
+                    color: action.destructive
+                        ? Colors.red
+                        : theme.textPrimary,
                     fontWeight: FontWeight.w500,
                   ),
                 ),

lib/shared/widgets/conduit_components.dart

@@ -293,6 +293,8 @@ class ConduitCard extends StatelessWidget {
   final bool isSelected;
   final bool isElevated;
   final bool isCompact;
+  final Color? backgroundColor;
+  final Color? borderColor;
 
   const ConduitCard({
     super.key,
@@ -302,6 +304,8 @@ class ConduitCard extends StatelessWidget {
     this.isSelected = false,
     this.isElevated = false,
     this.isCompact = false,
+    this.backgroundColor,
+    this.borderColor,
   });
 
   @override
@@ -317,14 +321,14 @@ class ConduitCard extends StatelessWidget {
               ? context.conduitTheme.buttonPrimary.withValues(
                   alpha: Alpha.highlight,
                 )
-              : context.conduitTheme.cardBackground,
+              : backgroundColor ?? context.conduitTheme.cardBackground,
           borderRadius: BorderRadius.circular(AppBorderRadius.card),
           border: Border.all(
             color: isSelected
                 ? context.conduitTheme.buttonPrimary.withValues(
                     alpha: Alpha.standard,
                   )
-                : context.conduitTheme.cardBorder,
+                : borderColor ?? context.conduitTheme.cardBorder,
             width: BorderWidth.standard,
           ),
           boxShadow: isElevated ? ConduitShadows.card(context) : null,