dark mode

web/src/components/ui/theme-toggle.tsx

@@ -0,0 +1,24 @@
+'use client';
+
+import * as React from 'react';
+import { Moon, Sun } from 'lucide-react';
+import { useTheme } from 'next-themes';
+
+import { Button } from '@/components/ui/button';
+
+export function ThemeToggle() {
+  const { theme, setTheme } = useTheme();
+
+  return (
+    <Button
+      variant="outline"
+      size="icon"
+      onClick={() => setTheme(theme === 'light' ? 'dark' : 'light')}
+      className="h-9 w-9"
+    >
+      <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
+      <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
+      <span className="sr-only">切换主题</span>
+    </Button>
+  );
+}