2要素認証コンポーネント

<div class="flex items-center justify-center min-h-screen bg-gradient-to-br from-purple-dark to-purple-light dark:from-gray-900 dark:to-black">
  <div class="relative p-8 rounded-xl shadow-lg bg-white bg-opacity-10 backdrop-filter backdrop-blur-lg border border-opacity-20 border-white max-w-md w-full mx-4">
    <div class="absolute inset-0 bg-white bg-opacity-5 dark:bg-black dark:bg-opacity-5 rounded-xl pointer-events-none"></div>
    
    <h2 class="text-3xl font-bold text-white mb-6 text-center">🔐 Two-Factor Authentication</h2>
    
    <p class="text-white text-opacity-80 mb-8 text-center">Please enter the 6-digit code from your authenticator app.</p>
    
    <div class="flex justify-center space-x-4 mb-8">
      <input type="text" maxlength="1" class="w-12 h-14 text-center text-white text-2xl bg-white bg-opacity-20 rounded-lg border border-opacity-30 border-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-opacity-60 transition duration-200 dark:bg-black dark:bg-opacity-20 dark:border-opacity-30 dark:border-gray-700" />
      <input type="text" maxlength="1" class="w-12 h-14 text-center text-white text-2xl bg-white bg-opacity-20 rounded-lg border border-opacity-30 border-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-opacity-60 transition duration-200 dark:bg-black dark:bg-opacity-20 dark:border-opacity-30 dark:border-gray-700" />
      <input type="text" maxlength="1" class="w-12 h-14 text-center text-white text-2xl bg-white bg-opacity-20 rounded-lg border border-opacity-30 border-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-opacity-60 transition duration-200 dark:bg-black dark:bg-opacity-20 dark:border-opacity-30 dark:border-gray-700" />
      <input type="text" maxlength="1" class="w-12 h-14 text-center text-white text-2xl bg-white bg-opacity-20 rounded-lg border border-opacity-30 border-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-opacity-60 transition duration-200 dark:bg-black dark:bg-opacity-20 dark:border-opacity-30 dark:border-gray-700" />
      <input type="text" maxlength="1" class="w-12 h-14 text-center text-white text-2xl bg-white bg-opacity-20 rounded-lg border border-opacity-30 border-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-opacity-60 transition duration-200 dark:bg-black dark:bg-opacity-20 dark:border-opacity-30 dark:border-gray-700" />
      <input type="text" maxlength="1" class="w-12 h-14 text-center text-white text-2xl bg-white bg-opacity-20 rounded-lg border border-opacity-30 border-white focus:outline-none focus:ring-2 focus:ring-white focus:ring-opacity-60 transition duration-200 dark:bg-black dark:bg-opacity-20 dark:border-opacity-30 dark:border-gray-700" />
    </div>
    
    <button class="w-full py-3 rounded-lg bg-purple-600 hover:bg-purple-700 text-white font-semibold text-lg transition duration-200 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:ring-opacity-70 dark:bg-purple-700 dark:hover:bg-purple-800">
      Verify Code
    </button>
    
    <p class="text-white text-opacity-70 text-center mt-6 text-sm">
      Didn