first commit

app/Http/Controllers/Admin/ThemeController.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Cookie;
+
+class ThemeController extends Controller
+{
+    public function update(Request $request)
+    {
+        $theme = $request->input('theme', 'dark-blue');
+        
+        // 儲存主題偏好到 Cookie (365天)
+        Cookie::queue('theme', $theme, 525600);
+        
+        return redirect()->back()->with('success', '主題已更新');
+    }
+}