导航栏代码，配置文件

ln_jq_app/lib/common/styles/theme.dart

@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+
+class AppTheme {
+  static const String Font_Montserrat = 'Montserrat';
+
+  static const String Font_YuYang = 'YuYang';
+
+  static const Color themeColor = Color(0xFF0c83c3);
+
+  static const Color secondaryColor = Colors.orange;
+
+  static const Color darkThemeColor = Color(0xFF032896);
+
+  /// 亮色主题样式
+  static ThemeData light = ThemeData(
+    useMaterial3: false,
+    fontFamily: Font_Montserrat,
+    colorScheme: ColorScheme.fromSeed(
+      seedColor: themeColor,
+      primary: themeColor,
+      secondary: secondaryColor,
+      brightness: Brightness.light,
+      surface: Colors.white,
+      surfaceTint: Colors.transparent,
+    ),
+    appBarTheme: const AppBarTheme(
+      backgroundColor: Colors.white,
+      foregroundColor: Color.fromARGB(200, 0, 0, 0),
+      centerTitle: true,
+      titleTextStyle: TextStyle(
+        fontSize: 18,
+        fontWeight: FontWeight.bold,
+        color: Color.fromARGB(200, 0, 0, 0),
+      ),
+    ),
+  );
+
+  /// 暗色主题样式
+  static ThemeData dark = ThemeData(
+    useMaterial3: false,
+    fontFamily: Font_Montserrat,
+    colorScheme: ColorScheme.fromSeed(
+      seedColor: darkThemeColor,
+      brightness: Brightness.dark,
+      surface: const Color.fromARGB(255, 42, 42, 42),
+      surfaceTint: Colors.transparent,
+    ),
+    appBarTheme: const AppBarTheme(
+      backgroundColor: Color.fromARGB(255, 34, 34, 34),
+      centerTitle: true,
+      titleTextStyle: TextStyle(
+        fontSize: 18,
+        fontWeight: FontWeight.bold,
+      ),
+    ),
+    bottomAppBarTheme:  BottomAppBarThemeData(
+      color: Color.fromARGB(255, 34, 34, 34),
+      elevation: 4.0,
+    ),
+  );
+}