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lib/config/theme/base/app_theme_ext.dart

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+import 'package:flutter/material.dart';
+
+import 'app_colors_base.dart';
+
+@immutable
+class AppThemeExtension extends ThemeExtension<AppThemeExtension> {
+  final Color success;
+  final Color warning;
+  final Color danger;
+  final Color textSecondary;
+
+  const AppThemeExtension({
+    required this.success,
+    required this.warning,
+    required this.danger,
+    required this.textSecondary,
+  });
+
+  // 工厂方法，根据 AppColorsBase 创建
+  factory AppThemeExtension.fromColors(AppColorsBase colors) {
+    return AppThemeExtension(
+      success: colors.success,
+      warning: colors.warning,
+      danger: colors.danger,
+      textSecondary: colors.textSecondary,
+    );
+  }
+
+  @override
+  ThemeExtension<AppThemeExtension> copyWith({
+    Color? success,
+    Color? warning,
+    Color? danger,
+    Color? textSecondary,
+  }) {
+    return AppThemeExtension(
+      success: success ?? this.success,
+      warning: warning ?? this.warning,
+      danger: danger ?? this.danger,
+      textSecondary: textSecondary ?? this.textSecondary,
+    );
+  }
+
+  @override
+  AppThemeExtension lerp(AppThemeExtension? other, double t) {
+    if (other == null) return this;
+    return AppThemeExtension(
+      success: Color.lerp(success, other.success, t)!,
+      warning: Color.lerp(warning, other.warning, t)!,
+      danger: Color.lerp(danger, other.danger, t)!,
+      textSecondary: Color.lerp(textSecondary, other.textSecondary, t)!,
+    );
+  }
+}
+
+extension AppThemeExt on BuildContext {
+  AppThemeExtension get themeEx => Theme.of(this).extension<AppThemeExtension>()!;
+
+  Color get success => themeEx.success;
+
+  Color get warning => themeEx.warning;
+
+  Color get danger => themeEx.danger;
+
+  Color get textSecondary => themeEx.textSecondary;
+}