diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 82d8fed..63ab675 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -5,14 +5,25 @@
 </template>
 
 <script setup>
-import { onMounted } from 'vue'
+import { onMounted, computed } from 'vue'
 import { ConfigProvider as AConfigProvider } from 'ant-design-vue'
 import zhCN from 'ant-design-vue/es/locale/zh_CN'
 import { useAuthStore } from '@/stores/auth'
-import antdTheme from './antd-theme'
+import getAntdTheme from './antd-theme'
+import { useTheme, initTheme, watchSystemTheme } from '@/composables/useTheme'
 
 const authStore = useAuthStore()
 
+// 初始化主题（全局）
+initTheme()
+watchSystemTheme()
+
+// 使用主题
+const { isDark } = useTheme()
+
+// 动态生成 Ant Design 主题
+const antdTheme = computed(() => getAntdTheme(isDark.value))
+
 // 应用启动时验证 Token
 onMounted(async () => {
   if (authStore.isAuthenticated) {
diff --git a/frontend/src/antd-theme.js b/frontend/src/antd-theme.js
index 0fec889..d18ac4a 100644
--- a/frontend/src/antd-theme.js
+++ b/frontend/src/antd-theme.js
@@ -1,77 +1,185 @@
+import { theme } from 'ant-design-vue'
+
 /**
  * Ant Design Vue 主题配置
  * 匹配现有 Material Design 3 色彩系统
+ * @param {boolean} isDark - 是否为暗黑模式
  */
-export default {
-  token: {
-    // 主色调 - 绿色（与 MD3 primary 保持一致）
-    colorPrimary: '#4caf50',
+export default function getAntdTheme(isDark = false) {
+  return {
+    token: {
+      // 主色调 - 绿色（与 MD3 primary 保持一致）
+      colorPrimary: isDark ? '#81c784' : '#4caf50',
 
-    // 成功色
-    colorSuccess: '#4caf50',
+      // 成功色
+      colorSuccess: isDark ? '#81c784' : '#4caf50',
 
-    // 警告色
-    colorWarning: '#ff9800',
+      // 警告色
+      colorWarning: '#ff9800',
 
-    // 错误色
-    colorError: '#f56c6c',
+      // 错误色
+      colorError: '#f56c6c',
 
-    // 信息色 - 蓝色（与 MD3 secondary 保持一致）
-    colorInfo: '#2196f3',
+      // 信息色 - 蓝色（与 MD3 secondary 保持一致）
+      colorInfo: isDark ? '#64b5f6' : '#2196f3',
 
-    // 边框圆角 - 与 Material Design 3 一致
-    borderRadius: 12,
+      // 背景色
+      colorBgBase: isDark ? '#121212' : '#ffffff',
+      colorBgContainer: isDark ? '#1c1c1e' : '#ffffff',
+      colorBgElevated: isDark ? '#2c2c2e' : '#ffffff',
+      colorBgLayout: isDark ? '#121212' : '#fafafa',
+      colorBgSpotlight: isDark ? '#2c2c2e' : '#ffffff',
 
-    // 字体家族
-    fontFamily: "'Inter', 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif",
+      // 文字色
+      colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+      colorTextSecondary: isDark ? '#a0a0a3' : '#64748b',
+      colorTextTertiary: isDark ? '#808083' : '#94a3b8',
+      colorTextQuaternary: isDark ? '#606063' : '#cbd5e1',
 
-    // 链接色
-    colorLink: '#2196f3',
+      // 边框色
+      colorBorder: isDark ? '#3a3a3c' : '#e5e7eb',
+      colorBorderSecondary: isDark ? '#2c2c2e' : '#f3f4f6',
 
-    // 字体大小
-    fontSize: 14,
+      // 分割线颜色
+      colorSplit: isDark ? '#3a3a3c' : '#e5e7eb',
 
-    // 行高
-    lineHeight: 1.5715,
-  },
+      // 边框圆角 - 与 Material Design 3 一致
+      borderRadius: 12,
 
-  components: {
-    // Card 组件定制
-    Card: {
-      borderRadiusLG: 16,
-      boxShadowTertiary: '0 1px 3px 1px rgba(0, 0, 0, 0.08)',
-      paddingLG: 24,
-    },
+      // 字体家族
+      fontFamily: "'Inter', 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif",
 
-    // Button 组件定制
-    Button: {
-      borderRadius: 24, // 圆角按钮，类似 MD3
-      controlHeight: 40,
+      // 链接色
+      colorLink: isDark ? '#64b5f6' : '#2196f3',
+      colorLinkHover: isDark ? '#90caf9' : '#1976d2',
+      colorLinkActive: isDark ? '#42a5f5' : '#1565c0',
+
+      // 字体大小
       fontSize: 14,
-    },
 
-    // Input 组件定制
-    Input: {
-      borderRadius: 12,
+      // 行高
+      lineHeight: 1.5715,
+
+      // 控制组件高度
       controlHeight: 40,
     },
 
-    // Modal 组件定制
-    Modal: {
-      borderRadiusLG: 16,
+    components: {
+      // Card 组件定制
+      Card: {
+        borderRadiusLG: 16,
+        boxShadowTertiary: isDark
+          ? '0 1px 3px 1px rgba(0, 0, 0, 0.5)'
+          : '0 1px 3px 1px rgba(0, 0, 0, 0.08)',
+        paddingLG: 24,
+        colorBgContainer: isDark ? '#1c1c1e' : '#ffffff',
+        colorBorderSecondary: isDark ? '#3a3a3c' : '#f0f0f0',
+        colorTextHeading: isDark ? '#e5e5e7' : '#1c1b1f',
+      },
+
+      // Button 组件定制
+      Button: {
+        borderRadius: 24, // 圆角按钮，类似 MD3
+        controlHeight: 40,
+        fontSize: 14,
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorBgContainer: isDark ? '#2c2c2e' : '#ffffff',
+      },
+
+      // Input 组件定制
+      Input: {
+        borderRadius: 12,
+        controlHeight: 40,
+        colorBgContainer: isDark ? '#2c2c2e' : '#ffffff',
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorTextPlaceholder: isDark ? '#808083' : '#94a3b8',
+        colorBorder: isDark ? '#3a3a3c' : '#e5e7eb',
+      },
+
+      // Select 组件定制
+      Select: {
+        borderRadius: 12,
+        controlHeight: 40,
+        colorBgContainer: isDark ? '#2c2c2e' : '#ffffff',
+        colorBgElevated: isDark ? '#2c2c2e' : '#ffffff',
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorTextPlaceholder: isDark ? '#808083' : '#94a3b8',
+        colorBorder: isDark ? '#3a3a3c' : '#e5e7eb',
+      },
+
+      // Modal 组件定制
+      Modal: {
+        borderRadiusLG: 16,
+        colorBgElevated: isDark ? '#1c1c1e' : '#ffffff',
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorTextHeading: isDark ? '#e5e5e7' : '#1c1b1f',
+      },
+
+      // Table 组件定制
+      Table: {
+        borderRadius: 12,
+        colorBgContainer: isDark ? '#1c1c1e' : '#ffffff',
+        colorFillAlter: isDark ? '#2c2c2e' : '#f5f7fa',
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorTextHeading: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorBorderSecondary: isDark ? '#3a3a3c' : '#f0f0f0',
+      },
+
+      // Tabs 组件定制
+      Tabs: {
+        borderRadius: 12,
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorBgContainer: isDark ? '#1c1c1e' : '#ffffff',
+      },
+
+      // Menu 组件定制
+      Menu: {
+        colorItemBg: isDark ? '#1c1c1e' : '#ffffff',
+        colorItemBgHover: isDark ? '#2c2c2e' : '#f5f7fa',
+        colorItemBgSelected: isDark ? '#2c2c2e' : '#e8f5e9',
+        colorItemText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorItemTextSelected: isDark ? '#81c784' : '#4caf50',
+      },
+
+      // Dropdown 组件定制
+      Dropdown: {
+        colorBgElevated: isDark ? '#2c2c2e' : '#ffffff',
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+      },
+
+      // Descriptions 组件定制
+      Descriptions: {
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorTextSecondary: isDark ? '#a0a0a3' : '#64748b',
+        colorBgContainer: isDark ? '#1c1c1e' : '#ffffff',
+        colorFillAlter: isDark ? '#2c2c2e' : '#f5f7fa',
+      },
+
+      // Alert 组件定制
+      Alert: {
+        borderRadiusLG: 12,
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+      },
+
+      // Drawer 组件定制
+      Drawer: {
+        colorBgElevated: isDark ? '#1c1c1e' : '#ffffff',
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+      },
+
+      // Form 组件定制
+      Form: {
+        colorText: isDark ? '#e5e5e7' : '#1c1b1f',
+        colorTextHeading: isDark ? '#e5e5e7' : '#1c1b1f',
+      },
+
+      // Empty 组件定制
+      Empty: {
+        colorTextDescription: isDark ? '#a0a0a3' : '#94a3b8',
+      },
     },
 
-    // Table 组件定制
-    Table: {
-      borderRadius: 12,
-    },
-
-    // Tabs 组件定制
-    Tabs: {
-      borderRadius: 12,
-    },
-  },
-
-  // 算法配置
-  algorithm: [],
+    // 算法配置 - 使用 Ant Design 内置的暗黑算法
+    algorithm: isDark ? [theme.darkAlgorithm] : [],
+  }
 }
diff --git a/frontend/src/components/Layout.vue b/frontend/src/components/Layout.vue
index 039f29f..4ae76f5 100644
--- a/frontend/src/components/Layout.vue
+++ b/frontend/src/components/Layout.vue
@@ -29,6 +29,10 @@ onMounted(() => {
   background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
 }
 
+.dark .layout-container {
+  background: linear-gradient(135deg, #1a1a1a 0%, #0f0f0f 100%);
+}
+
 .main-content {
   flex: 1;
   overflow-y: auto;
diff --git a/frontend/src/components/Navbar.vue b/frontend/src/components/Navbar.vue
index c728599..2c55084 100644
--- a/frontend/src/components/Navbar.vue
+++ b/frontend/src/components/Navbar.vue
@@ -1,5 +1,5 @@
 <template>
-  <div class="sticky top-0 z-50 glass-effect border-b border-gray-200/50 shadow-md3-2">
+  <div class="sticky top-0 z-50 glass-effect border-b border-gray-200/50 dark:border-gray-700/50 shadow-md3-2">
     <nav class="max-w-7xl mx-auto px-6 py-4">
       <div class="flex items-center justify-between">
         <!-- Logo and Brand -->
@@ -23,8 +23,8 @@
                 :class="[
                   'px-4 py-2 rounded-full font-medium transition-all cursor-pointer',
                   isActive
-                    ? 'bg-primary-100 text-primary-700'
-                    : 'text-gray-700 hover:bg-gray-100'
+                    ? 'bg-primary-100 dark:bg-primary-900/30 text-primary-700 dark:text-primary-400'
+                    : 'text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700'
                 ]"
               >
                 <div class="flex items-center space-x-2">
@@ -44,8 +44,8 @@
                 :class="[
                   'px-4 py-2 rounded-full font-medium transition-all cursor-pointer',
                   isActive
-                    ? 'bg-primary-100 text-primary-700'
-                    : 'text-gray-700 hover:bg-gray-100'
+                    ? 'bg-primary-100 dark:bg-primary-900/30 text-primary-700 dark:text-primary-400'
+                    : 'text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700'
                 ]"
               >
                 <div class="flex items-center space-x-2">
@@ -65,8 +65,8 @@
                 :class="[
                   'px-4 py-2 rounded-full font-medium transition-all cursor-pointer',
                   isActive
-                    ? 'bg-primary-100 text-primary-700'
-                    : 'text-gray-700 hover:bg-gray-100'
+                    ? 'bg-primary-100 dark:bg-primary-900/30 text-primary-700 dark:text-primary-400'
+                    : 'text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700'
                 ]"
               >
                 <div class="flex items-center space-x-2">
@@ -81,7 +81,7 @@
               <a
                 :class="[
                   'px-4 py-2 rounded-full font-medium transition-all flex items-center space-x-2 cursor-pointer',
-                  isAdminPath ? 'bg-secondary-100 text-secondary-700' : 'text-gray-700 hover:bg-gray-100'
+                  isAdminPath ? 'bg-secondary-100 dark:bg-secondary-900/30 text-secondary-700 dark:text-secondary-400' : 'text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700'
                 ]"
               >
                 <SettingOutlined />
@@ -117,43 +117,57 @@
         </div>
 
         <!-- User Menu & Mobile Hamburger -->
-        <div class="flex items-center space-x-4">
-          <!-- Token Status Indicator (Desktop) -->
-          <a-tooltip v-if="!isMobile && showTokenStatus" :title="tokenStatusTooltip">
+        <div class="flex items-center space-x-2 md:space-x-4">
+          <!-- Token Status Indicator (Desktop & Mobile) -->
+          <a-tooltip v-if="showTokenStatus" :title="tokenStatusTooltip">
             <div
-              class="px-3 py-1.5 rounded-full cursor-pointer transition-all hover:bg-gray-100 flex items-center space-x-2"
+              class="px-2 md:px-3 py-1.5 rounded-full cursor-pointer transition-all hover:bg-gray-100 dark:hover:bg-gray-700 flex items-center space-x-1 md:space-x-2"
               @click="handleTokenStatusClick"
             >
               <a-badge :status="tokenBadgeStatus" />
-              <ClockCircleOutlined :class="tokenIconClass" />
-              <span class="text-sm">{{ tokenBadgeText }}</span>
-              <!-- 过期时显示刷新按钮 -->
+              <ClockCircleOutlined :class="[tokenIconClass, 'text-sm md:text-base']" />
+              <span class="text-xs md:text-sm hidden sm:inline">{{ tokenBadgeText }}</span>
+              <!-- 过期时显示刷新按钮（响应式设计） -->
               <a-button
                 v-if="remainingMinutes !== null && remainingMinutes < 0"
                 type="primary"
                 size="small"
+                class="!text-xs !px-2 md:!px-3"
                 @click.stop="handleRefreshToken"
               >
-                刷新
+                <span class="hidden sm:inline">刷新</span>
+                <ReloadOutlined class="sm:hidden" />
               </a-button>
             </div>
           </a-tooltip>
 
+          <!-- Theme Toggle Button -->
+          <a-tooltip :title="isDark ? '切换到亮色模式' : '切换到暗黑模式'">
+            <a-button
+              type="text"
+              class="!p-2 !flex !items-center !justify-center hover:!bg-gray-100 dark:hover:!bg-gray-700 transition-all"
+              @click="toggleTheme"
+            >
+              <BulbFilled v-if="isDark" class="text-lg text-yellow-400" />
+              <BulbOutlined v-else class="text-lg text-gray-700 dark:text-gray-300" />
+            </a-button>
+          </a-tooltip>
+
           <!-- Desktop User Menu -->
           <a-dropdown v-if="!isMobile" :trigger="['hover']">
-            <a class="flex items-center space-x-3 px-4 py-2 rounded-full hover:bg-gray-100 transition-all cursor-pointer">
+            <a class="flex items-center space-x-3 px-4 py-2 rounded-full hover:bg-gray-100 dark:hover:bg-gray-700 transition-all cursor-pointer">
               <a-avatar :style="{ backgroundColor: '#f56a00' }">
                 {{ userInitial }}
               </a-avatar>
-              <span class="hidden md:block font-medium text-gray-700">{{ authStore.user?.alias || '用户' }}</span>
-              <DownOutlined class="text-xs text-gray-500" />
+              <span class="hidden md:block font-medium text-gray-700 dark:text-gray-200">{{ authStore.user?.alias || '用户' }}</span>
+              <DownOutlined class="text-xs text-gray-500 dark:text-gray-400" />
             </a>
             <template #overlay>
               <a-menu>
                 <a-menu-item key="info" disabled>
                   <div class="px-2 py-1">
-                    <p class="text-sm font-medium text-gray-900">{{ authStore.user?.alias }}</p>
-                    <p class="text-xs text-gray-500 mt-1">{{ authStore.isAdmin ? '管理员' : '普通用户' }}</p>
+                    <p class="text-sm font-medium text-gray-900 dark:text-gray-100">{{ authStore.user?.alias }}</p>
+                    <p class="text-xs text-gray-500 dark:text-gray-400 mt-1">{{ authStore.isAdmin ? '管理员' : '普通用户' }}</p>
                   </div>
                 </a-menu-item>
                 <a-menu-divider />
@@ -176,7 +190,7 @@
             @click="drawerVisible = true"
             class="!p-2"
           >
-            <MenuOutlined class="text-xl" />
+            <MenuOutlined class="text-xl text-gray-700 dark:text-gray-300" />
           </a-button>
         </div>
       </div>
@@ -277,6 +291,7 @@ import { useAuthStore } from '@/stores/auth'
 import { useUserStore } from '@/stores/user'
 import { useTokenMonitor } from '@/composables/useTokenMonitor'
 import { useBreakpoint } from '@/composables/useBreakpoint'
+import { useTheme } from '@/composables/useTheme'
 import { Modal, message } from 'ant-design-vue'
 import QRCodeModal from './QRCodeModal.vue'
 import {
@@ -293,6 +308,9 @@ import {
   DownOutlined,
   CheckCircleOutlined,
   ClockCircleOutlined,
+  BulbOutlined,
+  BulbFilled,
+  ReloadOutlined,
 } from '@ant-design/icons-vue'
 
 const router = useRouter()
@@ -301,6 +319,7 @@ const authStore = useAuthStore()
 const userStore = useUserStore()
 const { isMobile } = useBreakpoint()
 const { getRemainingMinutes, tokenStatus } = useTokenMonitor()
+const { isDark, toggleTheme } = useTheme()
 
 const drawerVisible = ref(false)
 const qrcodeModalVisible = ref(false)
diff --git a/frontend/src/composables/useTheme.js b/frontend/src/composables/useTheme.js
new file mode 100644
index 0000000..90cfde9
--- /dev/null
+++ b/frontend/src/composables/useTheme.js
@@ -0,0 +1,106 @@
+import { ref, computed } from 'vue'
+
+const THEME_STORAGE_KEY = 'checkin-app-theme'
+
+// 全局主题状态（单例模式）
+const theme = ref('light')
+
+/**
+ * 应用主题到 DOM
+ */
+const applyTheme = (newTheme) => {
+  const html = document.documentElement
+
+  if (newTheme === 'dark') {
+    html.classList.add('dark')
+  } else {
+    html.classList.remove('dark')
+  }
+}
+
+/**
+ * 初始化主题
+ * 优先级: localStorage > 系统偏好 > 默认亮色
+ */
+export const initTheme = () => {
+  // 1. 尝试从 localStorage 读取
+  const savedTheme = localStorage.getItem(THEME_STORAGE_KEY)
+  if (savedTheme === 'light' || savedTheme === 'dark') {
+    theme.value = savedTheme
+    applyTheme(savedTheme)
+    return
+  }
+
+  // 2. 检测系统偏好
+  if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+    theme.value = 'dark'
+    applyTheme('dark')
+    return
+  }
+
+  // 3. 默认亮色
+  theme.value = 'light'
+  applyTheme('light')
+}
+
+/**
+ * 监听系统主题变化
+ */
+export const watchSystemTheme = () => {
+  if (!window.matchMedia) return
+
+  const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
+
+  const handleChange = (e) => {
+    // 仅在用户未手动设置主题时才跟随系统
+    const savedTheme = localStorage.getItem(THEME_STORAGE_KEY)
+    if (!savedTheme) {
+      const systemTheme = e.matches ? 'dark' : 'light'
+      theme.value = systemTheme
+      applyTheme(systemTheme)
+    }
+  }
+
+  mediaQuery.addEventListener('change', handleChange)
+
+  // 返回清理函数
+  return () => mediaQuery.removeEventListener('change', handleChange)
+}
+
+/**
+ * 主题管理 Composable
+ * 支持亮色/暗色模式切换，并持久化到 localStorage
+ */
+export function useTheme() {
+  /**
+   * 切换主题
+   */
+  const toggleTheme = () => {
+    const newTheme = theme.value === 'light' ? 'dark' : 'light'
+    theme.value = newTheme
+    applyTheme(newTheme)
+    localStorage.setItem(THEME_STORAGE_KEY, newTheme)
+  }
+
+  /**
+   * 设置指定主题
+   */
+  const setTheme = (newTheme) => {
+    if (newTheme !== 'light' && newTheme !== 'dark') {
+      console.warn(`Invalid theme: ${newTheme}. Using 'light' instead.`)
+      newTheme = 'light'
+    }
+
+    theme.value = newTheme
+    applyTheme(newTheme)
+    localStorage.setItem(THEME_STORAGE_KEY, newTheme)
+  }
+
+  return {
+    theme,
+    toggleTheme,
+    setTheme,
+    isDark: computed(() => theme.value === 'dark'),
+    isLight: computed(() => theme.value === 'light')
+  }
+}
diff --git a/frontend/src/main.js b/frontend/src/main.js
index 8716bd8..10c19d9 100644
--- a/frontend/src/main.js
+++ b/frontend/src/main.js
@@ -4,9 +4,6 @@ import { createPinia } from 'pinia'
 // Ant Design Vue
 import Antd from 'ant-design-vue'
 import 'ant-design-vue/dist/reset.css'
-import zhCN from 'ant-design-vue/es/locale/zh_CN'
-import { ConfigProvider } from 'ant-design-vue'
-import antdTheme from './antd-theme'
 
 import App from './App.vue'
 import router from './router'
@@ -18,13 +15,7 @@ const pinia = createPinia()
 app.use(pinia)
 app.use(router)
 
-// Ant Design Vue with custom theme
+// Ant Design Vue
 app.use(Antd)
 
-// Configure Ant Design globally
-app.config.globalProperties.$antdConfig = {
-  theme: antdTheme,
-  locale: zhCN,
-}
-
 app.mount('#app')
diff --git a/frontend/src/style.css b/frontend/src/style.css
index 49fb475..2f8337b 100644
--- a/frontend/src/style.css
+++ b/frontend/src/style.css
@@ -14,7 +14,7 @@
     font-weight: 400;
     color-scheme: light;
 
-    /* Material Design 3 color tokens */
+    /* Material Design 3 color tokens - Light Mode */
     --md-sys-color-primary: #4caf50;
     --md-sys-color-on-primary: #ffffff;
     --md-sys-color-secondary: #2196f3;
@@ -25,6 +25,21 @@
     --md-sys-color-on-background: #1c1b1f;
   }
 
+  /* Dark Mode Colors */
+  .dark {
+    color-scheme: dark;
+
+    /* Material Design 3 color tokens - Dark Mode */
+    --md-sys-color-primary: #81c784;
+    --md-sys-color-on-primary: #1b5e20;
+    --md-sys-color-secondary: #64b5f6;
+    --md-sys-color-on-secondary: #0d47a1;
+    --md-sys-color-surface: #1c1c1e;
+    --md-sys-color-on-surface: #e5e5e7;
+    --md-sys-color-background: #121212;
+    --md-sys-color-on-background: #e5e5e7;
+  }
+
   * {
     margin: 0;
     padding: 0;
@@ -41,6 +56,11 @@
     text-rendering: optimizeLegibility;
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
+    transition: background-color 0.3s ease, color 0.3s ease;
+  }
+
+  .dark body {
+    background: linear-gradient(135deg, #1a1a1a 0%, #0f0f0f 100%);
   }
 
   #app {
@@ -53,7 +73,7 @@
 @layer components {
   /* Material Design 3 Card */
   .md3-card {
-    @apply bg-white rounded-md3 shadow-md3-2 overflow-hidden transition-all duration-300;
+    @apply bg-white dark:bg-gray-800 rounded-md3 shadow-md3-2 overflow-hidden transition-all duration-300;
   }
 
   .md3-card:hover {
@@ -61,7 +81,7 @@
   }
 
   .md3-card-elevated {
-    @apply bg-white rounded-md3-lg shadow-md3-3;
+    @apply bg-white dark:bg-gray-800 rounded-md3-lg shadow-md3-3;
   }
 
   /* Material Design 3 Button */
@@ -71,25 +91,25 @@
   }
 
   .md3-button-filled {
-    @apply md3-button bg-primary-600 text-white hover:bg-primary-700 hover:shadow-md3-2;
+    @apply md3-button bg-primary-600 dark:bg-primary-500 text-white hover:bg-primary-700 dark:hover:bg-primary-600 hover:shadow-md3-2;
   }
 
   .md3-button-outlined {
-    @apply md3-button border-2 border-primary-600 text-primary-600 hover:bg-primary-50;
+    @apply md3-button border-2 border-primary-600 dark:border-primary-400 text-primary-600 dark:text-primary-400 hover:bg-primary-50 dark:hover:bg-gray-700;
   }
 
   .md3-button-text {
-    @apply md3-button text-primary-600 hover:bg-primary-50;
+    @apply md3-button text-primary-600 dark:text-primary-400 hover:bg-primary-50 dark:hover:bg-gray-700;
   }
 
   /* Fluent Design elements */
   .fluent-card {
-    @apply bg-white/80 backdrop-blur-xl rounded-lg border border-gray-200/50 shadow-lg;
-    @apply transition-all duration-300 hover:shadow-xl hover:border-gray-300/50;
+    @apply bg-white/80 dark:bg-gray-800/80 backdrop-blur-xl rounded-lg border border-gray-200/50 dark:border-gray-700/50 shadow-lg;
+    @apply transition-all duration-300 hover:shadow-xl hover:border-gray-300/50 dark:hover:border-gray-600/50;
   }
 
   .fluent-acrylic {
-    @apply bg-white/70 backdrop-blur-2xl backdrop-saturate-150;
+    @apply bg-white/70 dark:bg-gray-800/70 backdrop-blur-2xl backdrop-saturate-150;
   }
 
   /* Status badges */
@@ -98,24 +118,24 @@
   }
 
   .status-success {
-    @apply status-badge bg-green-100 text-green-800;
+    @apply status-badge bg-green-100 dark:bg-green-900/30 text-green-800 dark:text-green-300;
   }
 
   .status-warning {
-    @apply status-badge bg-yellow-100 text-yellow-800;
+    @apply status-badge bg-yellow-100 dark:bg-yellow-900/30 text-yellow-800 dark:text-yellow-300;
   }
 
   .status-error {
-    @apply status-badge bg-red-100 text-red-800;
+    @apply status-badge bg-red-100 dark:bg-red-900/30 text-red-800 dark:text-red-300;
   }
 
   .status-info {
-    @apply status-badge bg-blue-100 text-blue-800;
+    @apply status-badge bg-blue-100 dark:bg-blue-900/30 text-blue-800 dark:text-blue-300;
   }
 
   /* Loading skeleton */
   .skeleton {
-    @apply animate-pulse bg-gray-200 rounded;
+    @apply animate-pulse bg-gray-200 dark:bg-gray-700 rounded;
   }
 }
 
@@ -126,11 +146,11 @@
   }
 
   .glass-effect {
-    @apply bg-white/60 backdrop-blur-md backdrop-saturate-150;
+    @apply bg-white/60 dark:bg-gray-800/60 backdrop-blur-md backdrop-saturate-150;
   }
 
   .text-gradient {
-    @apply bg-gradient-to-r from-primary-600 to-secondary-600 bg-clip-text text-transparent;
+    @apply bg-gradient-to-r from-primary-600 to-secondary-600 dark:from-primary-400 dark:to-secondary-400 bg-clip-text text-transparent;
   }
 }
 
@@ -234,6 +254,12 @@
   font-weight: 600;
 }
 
+.dark .ant-table-thead > tr > th {
+  background: #2c2c2e;
+  color: #e5e5e7;
+  border-color: #3a3a3c;
+}
+
 /* Ant Design Tabs */
 .ant-tabs {
   color: var(--md-sys-color-on-surface);
@@ -264,15 +290,34 @@
   background: #f5f7fa;
 }
 
+.dark .ant-descriptions-bordered .ant-descriptions-item-label {
+  background: #2c2c2e;
+  color: #e5e5e7;
+}
+
+.dark .ant-descriptions-item-label,
+.dark .ant-descriptions-item-content {
+  color: #e5e5e7;
+  border-color: #3a3a3c;
+}
+
 /* Ant Design Statistic */
 .ant-statistic-title {
   color: #64748b;
 }
 
+.dark .ant-statistic-title {
+  color: #a0a0a3;
+}
+
 .ant-statistic-content {
   color: var(--md-sys-color-on-surface);
 }
 
+.dark .ant-statistic-content {
+  color: #e5e5e7;
+}
+
 /* Ant Design Drawer */
 .ant-drawer-content {
   border-radius: 16px 0 0 16px;
@@ -287,6 +332,308 @@
   border-radius: 12px;
 }
 
+/* Dark mode support for common elements */
+.dark .ant-card {
+  background: #1c1c1e;
+  border-color: #3a3a3c;
+  color: #e5e5e7;
+}
+
+.dark .ant-card-head {
+  color: #e5e5e7;
+  border-color: #3a3a3c;
+}
+
+.dark .ant-card-body {
+  color: #e5e5e7;
+}
+
+.dark .ant-select-selector {
+  background: #2c2c2e !important;
+  border-color: #3a3a3c !important;
+  color: #e5e5e7 !important;
+}
+
+.dark .ant-select-selection-item {
+  color: #e5e5e7;
+}
+
+.dark .ant-select-arrow {
+  color: #a0a0a3;
+}
+
+.dark .ant-input {
+  background: #2c2c2e;
+  border-color: #3a3a3c;
+  color: #e5e5e7;
+}
+
+.dark .ant-input::placeholder {
+  color: #808083;
+}
+
+.dark .ant-modal-content {
+  background: #1c1c1e;
+}
+
+.dark .ant-modal-header {
+  background: #1c1c1e;
+  border-color: #3a3a3c;
+}
+
+.dark .ant-modal-title {
+  color: #e5e5e7;
+}
+
+.dark .ant-modal-body {
+  color: #e5e5e7;
+}
+
+.dark .ant-table {
+  background: #1c1c1e;
+  color: #e5e5e7;
+}
+
+.dark .ant-table-tbody > tr > td {
+  border-color: #3a3a3c;
+  color: #e5e5e7;
+}
+
+.dark .ant-table-tbody > tr:hover > td {
+  background: #2c2c2e;
+}
+
+.dark .ant-pagination-item {
+  background: #2c2c2e;
+  border-color: #3a3a3c;
+}
+
+.dark .ant-pagination-item a {
+  color: #e5e5e7;
+}
+
+.dark .ant-pagination-item:hover {
+  border-color: #81c784;
+}
+
+.dark .ant-pagination-item:hover a {
+  color: #81c784;
+}
+
+.dark .ant-empty-description {
+  color: #a0a0a3;
+}
+
+.dark .ant-form-item-label > label {
+  color: #e5e5e7;
+}
+
+.dark .ant-checkbox-wrapper {
+  color: #e5e5e7;
+}
+
+.dark .ant-radio-wrapper {
+  color: #e5e5e7;
+}
+
+.dark .ant-divider {
+  border-color: #3a3a3c;
+}
+
+/* Dropdown 暗黑模式 */
+.dark .ant-dropdown-menu {
+  background: #2c2c2e;
+}
+
+.dark .ant-dropdown-menu-item {
+  color: #e5e5e7;
+}
+
+.dark .ant-dropdown-menu-item:hover {
+  background: #3a3a3c;
+}
+
+/* 通用文本颜色 - 暗黑模式 */
+.dark p,
+.dark span,
+.dark div {
+  color: inherit;
+}
+
+.dark .hint,
+.dark .card-header {
+  color: #e5e5e7;
+}
+
+/* Select dropdown 暗黑模式 */
+.dark .ant-select-dropdown {
+  background: #2c2c2e;
+}
+
+.dark .ant-select-item {
+  color: #e5e5e7;
+}
+
+.dark .ant-select-item:hover {
+  background: #3a3a3c;
+}
+
+.dark .ant-select-item-option-selected {
+  background: #2c2c2e;
+  color: #81c784;
+}
+
+/* Drawer 暗黑模式 */
+.dark .ant-drawer-content {
+  background: #1c1c1e;
+}
+
+.dark .ant-drawer-header {
+  background: #1c1c1e;
+  border-color: #3a3a3c;
+}
+
+.dark .ant-drawer-title {
+  color: #e5e5e7;
+}
+
+.dark .ant-drawer-body {
+  background: #1c1c1e;
+  color: #e5e5e7;
+}
+
+/* 通用文本和标签颜色 */
+.dark .ant-tag {
+  border-color: #3a3a3c;
+}
+
+.dark .ant-btn-text {
+  color: #e5e5e7;
+}
+
+.dark .ant-btn-text:hover {
+  background: #2c2c2e;
+}
+
+.dark .ant-skeleton-content .ant-skeleton-title {
+  background: linear-gradient(90deg, #2c2c2e 25%, #3a3a3c 37%, #2c2c2e 63%);
+}
+
+.dark .ant-skeleton-content .ant-skeleton-paragraph > li {
+  background: linear-gradient(90deg, #2c2c2e 25%, #3a3a3c 37%, #2c2c2e 63%);
+}
+
+/* Message 和 Notification */
+.dark .ant-message-notice-content {
+  background: #2c2c2e;
+  color: #e5e5e7;
+}
+
+.dark .ant-notification-notice {
+  background: #2c2c2e;
+  color: #e5e5e7;
+}
+
+/* Spin loading */
+.dark .ant-spin-dot-item {
+  background: #81c784;
+}
+
+/* Tooltip */
+.ant-tooltip-inner {
+  background: rgba(255, 255, 255, 0.95) !important;
+  color: #1c1b1f !important;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15) !important;
+  padding: 8px 12px !important;
+  display: flex !important;
+  align-items: center !important;
+  min-height: 32px !important;
+}
+
+.dark .ant-tooltip-inner {
+  background: rgba(50, 50, 50, 0.95) !important;
+  color: #e5e5e7 !important;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5) !important;
+}
+
+.ant-tooltip-arrow-content {
+  background: rgba(255, 255, 255, 0.95) !important;
+}
+
+.dark .ant-tooltip-arrow-content {
+  background: rgba(50, 50, 50, 0.95) !important;
+}
+
+/* 通用标题和文本颜色 */
+.dark h1,
+.dark h2,
+.dark h3,
+.dark h4,
+.dark h5,
+.dark h6 {
+  color: #e5e5e7;
+}
+
+/* 通用容器和组件类 */
+.dark .card-header,
+.dark .hint,
+.dark .label {
+  color: #e5e5e7;
+}
+
+.dark .hint {
+  color: #a0a0a3;
+}
+
+/* 亮色模式下的通用样式 */
+.card-header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-weight: bold;
+  color: #1c1b1f;
+}
+
+.hint {
+  margin-bottom: 20px;
+  color: #909399;
+  font-size: 14px;
+}
+
+.label {
+  font-weight: bold;
+  margin-bottom: 10px;
+  color: #606266;
+}
+
+/* Material Design 3 卡片 - 暗黑模式统一样式 */
+.dark .md3-card,
+.dark .md3-card-elevated {
+  background: #1c1c1e;
+  border-color: #3a3a3c;
+  color: #e5e5e7;
+}
+
+/* Fluent Design 卡片 - 暗黑模式 */
+.dark .fluent-card {
+  background: rgba(28, 28, 30, 0.8);
+  border-color: rgba(58, 58, 60, 0.5);
+}
+
+/* 通用按钮对齐 */
+.ant-btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.ant-btn .anticon {
+  display: inline-flex;
+  align-items: center;
+  vertical-align: middle;
+  line-height: 1;
+}
+
 /* Ant Design Pagination */
 .ant-pagination-item-active {
   border-color: var(--md-sys-color-primary);
diff --git a/frontend/src/views/DashboardView.vue b/frontend/src/views/DashboardView.vue
index bf934bc..45cbcdc 100644
--- a/frontend/src/views/DashboardView.vue
+++ b/frontend/src/views/DashboardView.vue
@@ -335,13 +335,6 @@ onMounted(async () => {
   margin: 0 auto;
 }
 
-.card-header {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  font-weight: bold;
-}
-
 .loading-container {
   padding: 20px;
 }
@@ -357,37 +350,8 @@ onMounted(async () => {
   padding: 20px;
 }
 
-.hint {
-  margin-bottom: 20px;
-  color: #909399;
-  font-size: 14px;
-}
-
 .last-check-in {
   width: 100%;
   margin-top: 20px;
 }
-
-.label {
-  font-weight: bold;
-  margin-bottom: 10px;
-  color: #606266;
-}
-
-.status-card {
-  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
-}
-
-/* 修复按钮图标对齐 */
-:deep(.ant-btn) {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-}
-
-:deep(.ant-btn .anticon) {
-  display: inline-flex;
-  align-items: center;
-  vertical-align: middle;
-}
 </style>
diff --git a/frontend/src/views/SettingsView.vue b/frontend/src/views/SettingsView.vue
index 4ae4e7b..136da6a 100644
--- a/frontend/src/views/SettingsView.vue
+++ b/frontend/src/views/SettingsView.vue
@@ -2,11 +2,11 @@
   <Layout>
     <div class="settings-view">
       <div class="max-w-4xl mx-auto">
-        <h1 class="text-3xl font-bold text-gray-800 mb-6">个人设置</h1>
+        <h1 class="text-3xl font-bold text-gray-800 dark:text-gray-100 mb-6">个人设置</h1>
 
         <!-- 基本信息卡片 -->
         <div class="md3-card p-6 mb-6">
-          <h2 class="text-xl font-bold text-gray-800 mb-4 flex items-center">
+          <h2 class="text-xl font-bold text-gray-800 dark:text-gray-100 mb-4 flex items-center">
             <UserOutlined class="mr-2" />
             基本信息
           </h2>
@@ -32,7 +32,7 @@
 
         <!-- 修改邮箱 -->
         <div class="md3-card p-6 mb-6">
-          <h2 class="text-xl font-bold text-gray-800 mb-4 flex items-center">
+          <h2 class="text-xl font-bold text-gray-800 dark:text-gray-100 mb-4 flex items-center">
             <EditOutlined class="mr-2" />
             修改个人信息
           </h2>
@@ -77,7 +77,7 @@
 
         <!-- 设置/修改密码 -->
         <div class="md3-card p-6">
-          <h2 class="text-xl font-bold text-gray-800 mb-4 flex items-center">
+          <h2 class="text-xl font-bold text-gray-800 dark:text-gray-100 mb-4 flex items-center">
             <KeyOutlined class="mr-2" />
             {{ hasPassword ? '修改密码' : '设置密码' }}
           </h2>
@@ -296,14 +296,7 @@ onMounted(() => {
 </script>
 
 <style scoped>
-.md3-card {
-  background: white;
-  border-radius: 12px;
-  box-shadow: 0 1px 3px 1px rgba(0, 0, 0, 0.08);
-  transition: all 0.3s ease;
-}
-
-.md3-card:hover {
-  box-shadow: 0 4px 8px 3px rgba(0, 0, 0, 0.10);
+.settings-view {
+  min-height: 100%;
 }
 </style>
diff --git a/frontend/src/views/TasksView.vue b/frontend/src/views/TasksView.vue
index e775e3b..70caa98 100644
--- a/frontend/src/views/TasksView.vue
+++ b/frontend/src/views/TasksView.vue
@@ -7,7 +7,7 @@
           <div class="flex items-center justify-between mb-4">
             <div>
               <h1 class="text-4xl font-bold text-gradient mb-2">任务管理</h1>
-              <p class="text-gray-600">管理您的自动打卡任务</p>
+              <p class="text-gray-600 dark:text-gray-400">管理您的自动打卡任务</p>
             </div>
             <a-button
               type="primary"
@@ -28,11 +28,11 @@
               <div class="fluent-card p-6 animate-slide-up">
                 <div class="flex items-center justify-between">
                   <div>
-                    <p class="text-sm text-gray-600 mb-1">总任务数</p>
-                    <p class="text-3xl font-bold text-primary-600">{{ taskStore.taskStats.total }}</p>
+                    <p class="text-sm text-gray-600 dark:text-gray-400 mb-1">总任务数</p>
+                    <p class="text-3xl font-bold text-primary-600 dark:text-primary-400">{{ taskStore.taskStats.total }}</p>
                   </div>
-                  <div class="w-12 h-12 bg-primary-100 rounded-md3 flex items-center justify-center">
-                    <FileTextOutlined class="text-2xl text-primary-600" />
+                  <div class="w-12 h-12 bg-primary-100 dark:bg-primary-900/30 rounded-md3 flex items-center justify-center">
+                    <FileTextOutlined class="text-2xl text-primary-600 dark:text-primary-400" />
                   </div>
                 </div>
               </div>
@@ -42,11 +42,11 @@
               <div class="fluent-card p-6 animate-slide-up" style="animation-delay: 0.1s">
                 <div class="flex items-center justify-between">
                   <div>
-                    <p class="text-sm text-gray-600 mb-1">启用中</p>
-                    <p class="text-3xl font-bold text-green-600">{{ taskStore.taskStats.active }}</p>
+                    <p class="text-sm text-gray-600 dark:text-gray-400 mb-1">启用中</p>
+                    <p class="text-3xl font-bold text-green-600 dark:text-green-400">{{ taskStore.taskStats.active }}</p>
                   </div>
-                  <div class="w-12 h-12 bg-green-100 rounded-md3 flex items-center justify-center">
-                    <CheckCircleOutlined class="text-2xl text-green-600" />
+                  <div class="w-12 h-12 bg-green-100 dark:bg-green-900/30 rounded-md3 flex items-center justify-center">
+                    <CheckCircleOutlined class="text-2xl text-green-600 dark:text-green-400" />
                   </div>
                 </div>
               </div>
@@ -56,11 +56,11 @@
               <div class="fluent-card p-6 animate-slide-up" style="animation-delay: 0.2s">
                 <div class="flex items-center justify-between">
                   <div>
-                    <p class="text-sm text-gray-600 mb-1">已禁用</p>
-                    <p class="text-3xl font-bold text-gray-600">{{ taskStore.taskStats.inactive }}</p>
+                    <p class="text-sm text-gray-600 dark:text-gray-400 mb-1">已禁用</p>
+                    <p class="text-3xl font-bold text-gray-600 dark:text-gray-300">{{ taskStore.taskStats.inactive }}</p>
                   </div>
-                  <div class="w-12 h-12 bg-gray-100 rounded-md3 flex items-center justify-center">
-                    <StopOutlined class="text-2xl text-gray-600" />
+                  <div class="w-12 h-12 bg-gray-100 dark:bg-gray-700 rounded-md3 flex items-center justify-center">
+                    <StopOutlined class="text-2xl text-gray-600 dark:text-gray-300" />
                   </div>
                 </div>
               </div>
diff --git a/frontend/tailwind.config.js b/frontend/tailwind.config.js
index 99c15ac..4f5e82d 100644
--- a/frontend/tailwind.config.js
+++ b/frontend/tailwind.config.js
@@ -1,5 +1,6 @@
 /** @type {import('tailwindcss').Config} */
 export default {
+  darkMode: 'class', // 启用 class 模式的暗黑模式
   content: [
     "./index.html",
     "./src/**/*.{vue,js,ts,jsx,tsx}",