added dark mode

index.html

@@ -6,6 +6,17 @@
     <meta content="width=device-width, initial-scale=1.0,maximum-scale=1.0, user-scalable=no" name="viewport">
     <!-- todo -->
     <title>admin </title>
+    <script>
+      (function () {
+        try {
+          var raw = localStorage.getItem('color-schema')
+          var schema = raw ? JSON.parse(raw) : 'auto'
+          var prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches
+          var isDark = schema === 'dark' || (schema !== 'light' && prefersDark)
+          if (isDark) document.documentElement.classList.add('is-dark')
+        } catch (e) {}
+      })()
+    </script>
   </head>
   <body>
     <div id="app"></div>