認証コンポーネント

<div class="min-h-screen bg-gray-100 dark:bg-gray-900 flex items-center justify-center">
    <div class="bg-white dark:bg-gray-800 rounded-lg shadow-md p-8 max-w-sm w-full">
        <h2 class="text-2xl font-semibold text-gray-800 dark:text-gray-200 text-center">Login</h2>
        <form class="mt-4 space-y-4">
            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300">Email Address</label>
                <input type="email" required class="mt-1 block w-full border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-600 dark:bg-gray-700 dark:border-gray-600 dark:text-gray-200 dark:focus:ring-blue-500" placeholder="you@example.com">
            </div>
            <div>
                <label class="block text-sm font-medium text-gray-700 dark:text-gray-300">Password</label>
                <input type="password" required class="mt-1 block w-full border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-2 focus:ring-blue-600 dark:bg-gray-700 dark:border-gray-600 dark:text-gray-200 dark:focus:ring-blue-500" placeholder="********">
            </div>
            <button type="submit" class="w-full bg-blue-600 dark:bg-blue-500 text-white font-semibold py-2 rounded-md shadow hover:bg-blue-500 dark:hover:bg-blue-400 transition duration-300">Login</button>
        </form>
        <div class="mt-4 text-center">
            <p class="text-sm text-gray-600 dark:text-gray-400">Don't have an account? <a href="#" class="text-blue-600 dark:text-blue-400 hover:underline">Sign Up</a></p>
        </div>
    </div>
</div>