diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 8a68ecf..5c818f3 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,6 +1,4 @@
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
-import { ConfigProvider } from 'antd';
-import zhCN from 'antd/locale/zh_CN';
 import ProjectList from './pages/ProjectList';
 import ProjectWizardNew from './pages/ProjectWizardNew';
 import Inspiration from './pages/Inspiration';
@@ -33,7 +31,7 @@ import './App.css';
 
 function App() {
   return (
-    <ConfigProvider locale={zhCN}>
+    <>
       {/* 🧧 春节喜庆装饰 */}
       <SpringFestival />
       <BrowserRouter
@@ -74,7 +72,7 @@ function App() {
           </Route>
         </Routes>
       </BrowserRouter>
-    </ConfigProvider>
+    </>
   );
 }
 
diff --git a/frontend/src/components/ThemeSwitch.tsx b/frontend/src/components/ThemeSwitch.tsx
new file mode 100644
index 0000000..e506ba3
--- /dev/null
+++ b/frontend/src/components/ThemeSwitch.tsx
@@ -0,0 +1,51 @@
+import { Segmented, Tooltip } from 'antd';
+import { BulbOutlined, MoonOutlined, DesktopOutlined } from '@ant-design/icons';
+import { useThemeMode } from '../theme/useThemeMode';
+import type { ThemeMode } from '../theme/themeStorage';
+import type { ReactNode } from 'react';
+
+interface ThemeSwitchProps {
+  size?: 'small' | 'middle' | 'large';
+  block?: boolean;
+}
+
+const options: Array<{ value: ThemeMode; label: ReactNode }> = [
+  {
+    value: 'light',
+    label: (
+      <Tooltip title="浅色模式">
+        <BulbOutlined />
+      </Tooltip>
+    ),
+  },
+  {
+    value: 'dark',
+    label: (
+      <Tooltip title="深色模式">
+        <MoonOutlined />
+      </Tooltip>
+    ),
+  },
+  {
+    value: 'system',
+    label: (
+      <Tooltip title="跟随系统">
+        <DesktopOutlined />
+      </Tooltip>
+    ),
+  },
+];
+
+export default function ThemeSwitch({ size = 'middle', block = false }: ThemeSwitchProps) {
+  const { mode, setMode } = useThemeMode();
+
+  return (
+    <Segmented
+      size={size}
+      value={mode}
+      onChange={(value) => setMode(value as ThemeMode)}
+      options={options}
+      block={block}
+    />
+  );
+}
diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index 4bee79d..213b42b 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -1,42 +1,14 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
-import { ConfigProvider } from 'antd'
-import zhCN from 'antd/locale/zh_CN'
 import 'antd/dist/reset.css'
 import './index.css'
 import App from './App.tsx'
+import { ThemeProvider } from './theme/ThemeProvider'
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
-    <ConfigProvider
-      locale={zhCN}
-      theme={{
-        token: {
-          colorPrimary: '#4D8088', // 天青
-          colorBgBase: '#F8F6F1', // 米汤色
-          colorTextBase: '#2B2B2B', // 墨色
-          borderRadius: 6,
-          wireframe: false,
-          fontFamily: "-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif",
-        },
-        components: {
-          Layout: {
-            bodyBg: '#F8F6F1',
-            headerBg: '#FFFFFF',
-            siderBg: '#FFFFFF',
-          },
-          Card: {
-            colorBgContainer: '#FFFFFF',
-            boxShadowTertiary: '0 4px 12px rgba(0, 0, 0, 0.05)', // 更柔和的阴影
-          },
-          Button: {
-            borderRadius: 6,
-            controlHeight: 36,
-          }
-        }
-      }}
-    >
+    <ThemeProvider>
       <App />
-    </ConfigProvider>
+    </ThemeProvider>
   </StrictMode>,
 )
diff --git a/frontend/src/theme/ThemeProvider.tsx b/frontend/src/theme/ThemeProvider.tsx
new file mode 100644
index 0000000..f75a719
--- /dev/null
+++ b/frontend/src/theme/ThemeProvider.tsx
@@ -0,0 +1,155 @@
+import { ConfigProvider } from 'antd';
+import zhCN from 'antd/locale/zh_CN';
+import { useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react';
+import type { PropsWithChildren } from 'react';
+import { getThemeConfig, type ResolvedThemeMode } from './themeConfig';
+import { ThemeModeContext } from './themeContext';
+import { getStoredThemeMode, setStoredThemeMode, type ThemeMode } from './themeStorage';
+
+const getSystemResolvedMode = (): ResolvedThemeMode => {
+  if (typeof window === 'undefined' || typeof window.matchMedia !== 'function') {
+    return 'light';
+  }
+  return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+};
+
+const getResolvedMode = (themeMode: ThemeMode, currentSystemMode: ResolvedThemeMode): ResolvedThemeMode => {
+  return themeMode === 'system' ? currentSystemMode : themeMode;
+};
+
+const hexToRgba = (hexColor: string, alpha: number): string => {
+  const hex = hexColor.replace('#', '').trim();
+
+  if (/^[\da-fA-F]{3}$/.test(hex)) {
+    const [r, g, b] = hex.split('');
+    return `rgba(${parseInt(`${r}${r}`, 16)}, ${parseInt(`${g}${g}`, 16)}, ${parseInt(`${b}${b}`, 16)}, ${alpha})`;
+  }
+
+  if (/^[\da-fA-F]{6}$/.test(hex)) {
+    return `rgba(${parseInt(hex.slice(0, 2), 16)}, ${parseInt(hex.slice(2, 4), 16)}, ${parseInt(hex.slice(4, 6), 16)}, ${alpha})`;
+  }
+
+  return `rgba(136, 77, 92, ${alpha})`;
+};
+
+export const ThemeProvider = ({ children }: PropsWithChildren) => {
+  const [mode, setModeState] = useState<ThemeMode>(() => getStoredThemeMode());
+  const [systemMode, setSystemMode] = useState<ResolvedThemeMode>(() => getSystemResolvedMode());
+  const transitionCleanupRef = useRef<number | null>(null);
+
+  useEffect(() => {
+    if (typeof window === 'undefined' || typeof window.matchMedia !== 'function') {
+      return;
+    }
+
+    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
+    const handleChange = (event: MediaQueryListEvent) => {
+      setSystemMode(event.matches ? 'dark' : 'light');
+    };
+
+    setSystemMode(mediaQuery.matches ? 'dark' : 'light');
+
+    if (typeof mediaQuery.addEventListener === 'function') {
+      mediaQuery.addEventListener('change', handleChange);
+      return () => mediaQuery.removeEventListener('change', handleChange);
+    }
+
+    mediaQuery.addListener(handleChange);
+    return () => mediaQuery.removeListener(handleChange);
+  }, []);
+
+  const resolvedMode: ResolvedThemeMode = getResolvedMode(mode, systemMode);
+  const themeConfig = useMemo(() => getThemeConfig(resolvedMode), [resolvedMode]);
+
+  const setMode = (nextMode: ThemeMode) => {
+    if (nextMode === mode) {
+      return;
+    }
+
+    const nextResolvedMode = getResolvedMode(nextMode, systemMode);
+    const applyMode = () => {
+      setModeState(nextMode);
+      setStoredThemeMode(nextMode);
+    };
+
+    if (typeof document === 'undefined') {
+      applyMode();
+      return;
+    }
+
+    const root = document.documentElement;
+    const docWithViewTransition = document as Document & {
+      startViewTransition?: (callback: () => void) => { finished: Promise<void> };
+    };
+
+    if (!docWithViewTransition.startViewTransition || nextResolvedMode === resolvedMode) {
+      applyMode();
+      return;
+    }
+
+    root.setAttribute('data-theme-transition', nextResolvedMode === 'dark' ? 'to-dark' : 'to-light');
+
+    try {
+      docWithViewTransition.startViewTransition(() => {
+        applyMode();
+      }).finished.finally(() => {
+        if (transitionCleanupRef.current !== null) {
+          window.clearTimeout(transitionCleanupRef.current);
+        }
+        transitionCleanupRef.current = window.setTimeout(() => {
+          root.removeAttribute('data-theme-transition');
+          transitionCleanupRef.current = null;
+        }, 50);
+      });
+    } catch {
+      root.removeAttribute('data-theme-transition');
+      applyMode();
+    }
+  };
+
+  useLayoutEffect(() => {
+    if (typeof document === 'undefined') {
+      return;
+    }
+
+    const root = document.documentElement;
+    root.setAttribute('data-theme-mode', mode);
+    root.setAttribute('data-theme-resolved', resolvedMode);
+    root.style.colorScheme = resolvedMode;
+
+    const tooltipBg = themeConfig.token?.colorPrimary ?? '#884d5c';
+    root.style.setProperty('--app-tooltip-bg', tooltipBg);
+    root.style.setProperty('--app-tooltip-shadow', hexToRgba(tooltipBg, 0.3));
+  }, [mode, resolvedMode, themeConfig]);
+
+  useEffect(() => {
+    return () => {
+      if (transitionCleanupRef.current !== null) {
+        window.clearTimeout(transitionCleanupRef.current);
+      }
+    };
+  }, []);
+
+  const contextValue = useMemo(
+    () => ({
+      mode,
+      resolvedMode,
+      setMode,
+    }),
+    [mode, resolvedMode],
+  );
+
+  return (
+    <ThemeModeContext.Provider value={contextValue}>
+      <ConfigProvider
+        locale={zhCN}
+        theme={{
+          ...themeConfig,
+          cssVar: true,
+        }}
+      >
+        {children}
+      </ConfigProvider>
+    </ThemeModeContext.Provider>
+  );
+};
diff --git a/frontend/src/theme/themeConfig.ts b/frontend/src/theme/themeConfig.ts
new file mode 100644
index 0000000..09aa7ec
--- /dev/null
+++ b/frontend/src/theme/themeConfig.ts
@@ -0,0 +1,65 @@
+import type { ThemeConfig } from 'antd';
+import { theme } from 'antd';
+import type { ThemeMode } from './themeStorage';
+
+export type ResolvedThemeMode = Exclude<ThemeMode, 'system'>;
+
+const sharedToken: ThemeConfig['token'] = {
+  colorPrimary: '#4D8088',
+  borderRadius: 8,
+  wireframe: false,
+  fontFamily: "-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif",
+};
+
+const sharedComponents: ThemeConfig['components'] = {
+  Button: {
+    borderRadius: 8,
+    controlHeight: 36,
+  },
+  Card: {
+    borderRadiusLG: 12,
+  },
+  Tooltip: {
+    colorBgSpotlight: sharedToken.colorPrimary,
+  },
+};
+
+const lightThemeConfig: ThemeConfig = {
+  algorithm: theme.defaultAlgorithm,
+  token: {
+    ...sharedToken,
+    colorBgBase: '#F8F6F1',
+    colorTextBase: '#2B2B2B',
+    colorBgLayout: '#F8F6F1',
+    colorBgContainer: '#FFFFFF',
+  },
+  components: {
+    ...sharedComponents,
+    Layout: {
+      bodyBg: '#F8F6F1',
+      headerBg: '#FFFFFF',
+      siderBg: '#FFFFFF',
+    },
+  },
+};
+
+const darkThemeConfig: ThemeConfig = {
+  algorithm: theme.darkAlgorithm,
+  token: {
+    ...sharedToken,
+    colorBgBase: '#141414',
+    colorTextBase: '#f5f5f5',
+  },
+  components: {
+    ...sharedComponents,
+    Layout: {
+      bodyBg: '#0f1115',
+      headerBg: '#141414',
+      siderBg: '#141414',
+    },
+  },
+};
+
+export const getThemeConfig = (mode: ResolvedThemeMode): ThemeConfig => {
+  return mode === 'dark' ? darkThemeConfig : lightThemeConfig;
+};
diff --git a/frontend/src/theme/themeContext.ts b/frontend/src/theme/themeContext.ts
new file mode 100644
index 0000000..06ee91c
--- /dev/null
+++ b/frontend/src/theme/themeContext.ts
@@ -0,0 +1,11 @@
+import { createContext } from 'react';
+import type { ResolvedThemeMode } from './themeConfig';
+import type { ThemeMode } from './themeStorage';
+
+export interface ThemeContextValue {
+  mode: ThemeMode;
+  resolvedMode: ResolvedThemeMode;
+  setMode: (mode: ThemeMode) => void;
+}
+
+export const ThemeModeContext = createContext<ThemeContextValue | undefined>(undefined);
diff --git a/frontend/src/theme/themeStorage.ts b/frontend/src/theme/themeStorage.ts
new file mode 100644
index 0000000..b109b74
--- /dev/null
+++ b/frontend/src/theme/themeStorage.ts
@@ -0,0 +1,30 @@
+export type ThemeMode = 'light' | 'dark' | 'system';
+
+const THEME_MODE_STORAGE_KEY = 'mumu_theme_mode';
+
+const isThemeMode = (value: string | null): value is ThemeMode => {
+  return value === 'light' || value === 'dark' || value === 'system';
+};
+
+export const getStoredThemeMode = (): ThemeMode => {
+  try {
+    const value = localStorage.getItem(THEME_MODE_STORAGE_KEY);
+    if (isThemeMode(value)) {
+      return value;
+    }
+  } catch (error) {
+    console.warn('读取主题模式失败:', error);
+  }
+
+  return 'system';
+};
+
+export const setStoredThemeMode = (mode: ThemeMode): void => {
+  try {
+    localStorage.setItem(THEME_MODE_STORAGE_KEY, mode);
+  } catch (error) {
+    console.warn('保存主题模式失败:', error);
+  }
+};
+
+export const getThemeModeStorageKey = (): string => THEME_MODE_STORAGE_KEY;
diff --git a/frontend/src/theme/useThemeMode.ts b/frontend/src/theme/useThemeMode.ts
new file mode 100644
index 0000000..db705cc
--- /dev/null
+++ b/frontend/src/theme/useThemeMode.ts
@@ -0,0 +1,11 @@
+import { useContext } from 'react';
+import { ThemeModeContext } from './themeContext';
+import type { ThemeContextValue } from './themeContext';
+
+export const useThemeMode = (): ThemeContextValue => {
+  const context = useContext(ThemeModeContext);
+  if (!context) {
+    throw new Error('useThemeMode 必须在 ThemeProvider 内使用');
+  }
+  return context;
+};