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lib/config/theme/base/app_colors_base.dart

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+import 'package:flutter/material.dart';
+
+abstract class AppColorsBase {
+  /// 品牌主色
+  Color get primary;
+
+  Color get secondary;
+
+  // 灰度
+  Color get textPrimary;
+
+  Color get textSecondary;
+
+  // 扩展颜色
+  Color get success;
+
+  Color get warning;
+
+  Color get info;
+
+  Color get danger;
+
+  // 容器色
+  Color get surfaceContainerLowest;
+
+  Color get surfaceContainerLow;
+
+  Color get surfaceContainer;
+
+  Color get surfaceContainerHigh; //白色卡片 / item
+}

lib/config/theme/base/app_text_style.dart

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+import 'package:flutter/material.dart';
+import 'app_colors_base.dart'; // 假设你之前定义了 AppColorsBase
+
+TextTheme buildTextTheme(AppColorsBase colors) {
+  return TextTheme(
+    // 标题层级
+    titleLarge: TextStyle(
+      fontSize: 22, // 比正文大6
+      fontWeight: FontWeight.w700,
+      color: colors.textPrimary,
+    ),
+    titleMedium: TextStyle(
+      fontSize: 20, // 比正文大4
+      fontWeight: FontWeight.w700,
+      color: colors.textPrimary,
+    ),
+    titleSmall: TextStyle(
+      fontSize: 18, // 比正文大2
+      fontWeight: FontWeight.w600,
+      color: colors.textPrimary,
+    ),
+
+    // 正文字体
+    bodyLarge: TextStyle(
+      fontSize: 18, // 稍大正文
+      color: colors.textPrimary,
+    ),
+    bodyMedium: TextStyle(
+      fontSize: 16, // 正文标准
+      color: colors.textPrimary,
+    ),
+    bodySmall: TextStyle(
+      fontSize: 14, // 辅助正文
+      color: colors.textSecondary,
+    ),
+
+    // 标签/提示文字
+    labelLarge: TextStyle(
+      fontSize: 14, // 比正文小一点
+      fontWeight: FontWeight.w500,
+      color: colors.textSecondary,
+    ),
+    labelMedium: TextStyle(
+      fontSize: 12,
+      fontWeight: FontWeight.w500,
+      color: colors.textSecondary,
+    ),
+    labelSmall: TextStyle(
+      fontSize: 11,
+      fontWeight: FontWeight.w400,
+      color: colors.textSecondary,
+    ),
+  );
+}

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;
+}