style: 深色模式统一改为纯黑背景，去除泛紫

dist/custom-tab-bar/index.wxss

@@ -1 +1 @@
-.custom-tab-bar{-ms-flex-pack:distribute;-ms-flex-align:center;-webkit-align-items:center;align-items:center;background:#fff;border-top:3rpx dashed #a0c4ff;bottom:0;display:-webkit-flex;display:-ms-flexbox;display:flex;height:120rpx;-webkit-justify-content:space-around;justify-content:space-around;left:0;padding-bottom:env(safe-area-inset-bottom);position:fixed;right:0;z-index:1000}.custom-tab-bar.theme-dark{background:#1e1e2f;border-top-color:#5b8cff}.tab-item{-ms-flex-align:center;-ms-flex-pack:center;-webkit-align-items:center;align-items:center;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-justify-content:center;justify-content:center;padding:10rpx 20rpx;position:relative}.tab-icon-img{height:28rpx;margin-bottom:4rpx;opacity:.6;-webkit-transition:-webkit-transform .2s;transition:-webkit-transform .2s;transition:transform .2s;transition:transform .2s,-webkit-transform .2s;width:28rpx}.tab-item.active .tab-icon-img{opacity:1;-webkit-transform:scale(1.15);-ms-transform:scale(1.15);transform:scale(1.15)}.tab-label{color:#b08d8d;font-size:20rpx;-webkit-transition:color .2s;transition:color .2s}.custom-tab-bar.theme-dark .tab-label{color:#a0a0c0}.tab-item.active .tab-label{color:#ff9a9e;font-weight:600}.custom-tab-bar.theme-dark .tab-item.active .tab-label{color:#ff7eb3}
+.custom-tab-bar{-ms-flex-pack:distribute;-ms-flex-align:center;-webkit-align-items:center;align-items:center;background:#fff;border-top:3rpx dashed #a0c4ff;bottom:0;display:-webkit-flex;display:-ms-flexbox;display:flex;height:120rpx;-webkit-justify-content:space-around;justify-content:space-around;left:0;padding-bottom:env(safe-area-inset-bottom);position:fixed;right:0;z-index:1000}.custom-tab-bar.theme-dark{background:#000;border-top-color:#5b8cff}.tab-item{-ms-flex-align:center;-ms-flex-pack:center;-webkit-align-items:center;align-items:center;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-flex-direction:column;-ms-flex-direction:column;flex-direction:column;-webkit-justify-content:center;justify-content:center;padding:10rpx 20rpx;position:relative}.tab-icon-img{height:28rpx;margin-bottom:4rpx;opacity:.6;-webkit-transition:-webkit-transform .2s;transition:-webkit-transform .2s;transition:transform .2s;transition:transform .2s,-webkit-transform .2s;width:28rpx}.tab-item.active .tab-icon-img{opacity:1;-webkit-transform:scale(1.15);-ms-transform:scale(1.15);transform:scale(1.15)}.tab-label{color:#b08d8d;font-size:20rpx;-webkit-transition:color .2s;transition:color .2s}.custom-tab-bar.theme-dark .tab-label{color:#a8a8a8}.tab-item.active .tab-label{color:#ff9a9e;font-weight:600}.custom-tab-bar.theme-dark .tab-item.active .tab-label{color:#ff7eb3}

dist/theme.json

@@ -12,15 +12,15 @@
     "tabBarBorderStyle": "black"
   },
   "dark": {
-    "navBgColor": "#1e1e2f",
+    "navBgColor": "#000000",
     "navTxtStyle": "white",
-    "bgColor": "#1e1e2f",
+    "bgColor": "#000000",
     "bgTxtStyle": "light",
-    "bgColorTop": "#1e1e2f",
-    "bgColorBottom": "#1e1e2f",
-    "tabBarColor": "#a0a0c0",
+    "bgColorTop": "#000000",
+    "bgColorBottom": "#000000",
+    "tabBarColor": "#a8a8a8",
     "tabBarSelectedColor": "#ff7eb3",
-    "tabBarBgColor": "#1e1e2f",
+    "tabBarBgColor": "#000000",
     "tabBarBorderStyle": "white"
   }
 }

src/app.scss

@@ -14,7 +14,7 @@
 
 .theme-dark {
   min-height: 100vh;
-  background-color: var(--bg-page, #1e1e2f);
+  background-color: var(--bg-page, #000000);
   box-sizing: border-box;
 }
 
@@ -35,18 +35,18 @@
 }
 
 .theme-dark {
-  --bg-page: #1e1e2f;
+  --bg-page: #000000;
   --line-card: 3px dashed #5b8cff;
   --line-star: #5b8cff;
-  --text-primary: #e0e0f0;
-  --text-secondary: #a0a0c0;
-  --text-muted: #7070a0;
+  --text-primary: #e8e8e8;
+  --text-secondary: #a8a8a8;
+  --text-muted: #6f6f6f;
   --accent-pink: #ff7eb3;
   --accent-blue: #5cadff;
   --btn-gradient: linear-gradient(135deg, #ff7eb3 0%, #7a5cff 100%);
   --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.3);
-  --bg-input: #252540;
-  --bg-card: #2a2a40;
+  --bg-input: #141414;
+  --bg-card: #1a1a1a;
 }
 
 /* page 基础字体 */

src/custom-tab-bar/index.scss

@@ -16,7 +16,7 @@
 
 /* 自定义组件样式隔离：两套主题配色在组件内自包含，不依赖全局 app.wxss */
 .custom-tab-bar.theme-dark {
-  background: #1e1e2f;
+  background: #000000;
   border-top-color: #5b8cff;
 }
 
@@ -49,7 +49,7 @@
 }
 
 .custom-tab-bar.theme-dark .tab-label {
-  color: #a0a0c0;
+  color: #a8a8a8;
 }
 
 .tab-item.active .tab-label {

src/hooks/useStatusBar.ts

@@ -21,7 +21,7 @@ export function useStatusBar(resolvedTheme: 'light' | 'dark', options: UseStatus
   const apply = useCallback(() => {
     const isDarkText = mode === 'dark' || (mode === 'auto' && resolvedTheme === 'light')
     const frontColor = isDarkText ? '#000000' : '#ffffff'
-    const bgColor = isDarkText ? '#ffffff' : '#1e1e2f'
+    const bgColor = isDarkText ? '#ffffff' : '#000000'
 
     Taro.setNavigationBarColor({ frontColor, backgroundColor: bgColor })
     // 同步页面背景色，确保自定义导航区（状态栏下方、胶囊按钮区域）跟随主题，

src/theme.json

@@ -12,15 +12,15 @@
     "tabBarBorderStyle": "black"
   },
   "dark": {
-    "navBgColor": "#1e1e2f",
+    "navBgColor": "#000000",
     "navTxtStyle": "white",
-    "bgColor": "#1e1e2f",
+    "bgColor": "#000000",
     "bgTxtStyle": "light",
-    "bgColorTop": "#1e1e2f",
-    "bgColorBottom": "#1e1e2f",
-    "tabBarColor": "#a0a0c0",
+    "bgColorTop": "#000000",
+    "bgColorBottom": "#000000",
+    "tabBarColor": "#a8a8a8",
     "tabBarSelectedColor": "#ff7eb3",
-    "tabBarBgColor": "#1e1e2f",
+    "tabBarBgColor": "#000000",
     "tabBarBorderStyle": "white"
   }
 }

src/utils/themeBackground.ts

@@ -2,7 +2,7 @@ import Taro from '@tarojs/taro'
 
 /** 实际生效主题对应的窗口/页面背景色 */
 export function themePageColor(theme: 'light' | 'dark'): string {
-  return theme === 'dark' ? '#1e1e2f' : '#ffffff'
+  return theme === 'dark' ? '#000000' : '#ffffff'
 }
 
 /**