Mega Menu Component

<nav class="bg-gray-100 dark:bg-gray-900 shadow-lg">
  <div class="container mx-auto px-4">
    <div class="flex justify-between items-center py-4">
      <div>
        <a href="#" class="text-gray-800 dark:text-white text-xl font-bold">Dashboard</a>
      </div>
      <div class="hidden md:flex space-x-4">
        <div class="relative group">
          <button class="text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 focus:outline-none">Analytics</button>
          <div class="absolute z-10 hidden group-hover:block bg-white dark:bg-gray-800 shadow-md mt-2 rounded-md p-4">
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">Overview</a>
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">Reports</a>
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">Data Sources</a>
          </div>
        </div>
        <div class="relative group">
          <button class="text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 focus:outline-none">Users</button>
          <div class="absolute z-10 hidden group-hover:block bg-white dark:bg-gray-800 shadow-md mt-2 rounded-md p-4">
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">Manage Users</a>
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">Roles & Permissions</a>
          </div>
        </div>
        <div class="relative group">
          <button class="text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 focus:outline-none">Settings</button>
          <div class="absolute z-10 hidden group-hover:block bg-white dark:bg-gray-800 shadow-md mt-2 rounded-md p-4">
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">General Settings</a>
            <a href="#" class="block text-gray-800 dark:text-white hover:text-blue-600 dark:hover:text-blue-400 py-1">Billing</a>
          </div>
        </div>
      </div>
      <div class="md:hidden">
        <button class="text-gray-800 dark:text-white focus:outline-none">
          <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16m-7 6h7"></path></svg>
        </button>
      </div>
    </div>
  </div>
</nav>