侧边栏组件

<div class="flex h-screen bg-gray-100 dark:bg-gray-900">
  <!-- Sidebar -->
  <div class="w-64 bg-gray-800 text-white dark:bg-gray-950 dark:text-gray-200 flex flex-col">
    <div class="p-6 text-2xl font-bold border-b border-gray-700 dark:border-gray-800">BrutalNav</div>
    <nav class="flex-grow">
      <a href="#" class="block py-2 px-6 text-gray-300 hover:bg-gray-700 hover:text-white dark:hover:bg-gray-800 dark:hover:text-gray-100 transition duration-200">Home</a>
      <a href="#" class="block py-2 px-6 text-gray-300 hover:bg-gray-700 hover:text-white dark:hover:bg-gray-800 dark:hover:text-gray-100 transition duration-200">About</a>
      <a href="#" class="block py-2 px-6 text-gray-300 hover:bg-gray-700 hover:text-white dark:hover:bg-gray-800 dark:hover:text-gray-100 transition duration-200">Services</a>
      <a href="#" class="block py-2 px-6 text-gray-300 hover:bg-gray-700 hover:text-white dark:hover:bg-gray-800 dark:hover:text-gray-100 transition duration-200">Contact</a>
    </nav>
  </div>

  <!-- Content Area (placeholder) -->
  <div class="flex-grow p-10 text-gray-800 dark:text-gray-200">
    <h1 class="text-3xl font-bold mb-6">Main Content</h1>
    <p>This is the main content area. The sidebar is on the left.</p>
  </div>
</div>