Componente di autenticazione a due fattori

<div class="min-h-screen flex items-center justify-center p-4 bg-gradient-to-br from-blue-100 to-blue-300 dark:from-gray-900 dark:to-blue-950 transition-all duration-500 ease-in-out font-sans">

  <div class="w-full max-w-md bg-white dark:bg-gray-800 rounded-3xl shadow-xl overflow-hidden transform transition-all duration-500 ease-in-out group hover:shadow-2xl dark:shadow-blue-900/50 border border-blue-50/50 dark:border-blue-900 relative">

    <!-- Background Blob/Gradient Effect -->
    <div class="absolute -top-20 -left-20 w-64 h-64 bg-gradient-to-br from-blue-400 to-blue-600 rounded-full mix-blend-multiply filter blur-xl opacity-70 animate-blob dark:from-blue-700 dark:to-blue-900 transition-all duration-500 ease-in-out"></div>
    <div class="absolute -bottom-20 -right-20 w-64 h-64 bg-gradient-to-br from-cyan-400 to-sky-600 rounded-full mix-blend-multiply filter blur-xl opacity-70 animation-delay-2000 animate-blob dark:from-sky-700 dark:to-teal-900 transition-all duration-500 ease-in-out"></div>
    <div class="absolute -top-10 -right-10 w-48 h-48 bg-gradient-to-br from-indigo-400 to-purple-600 rounded-full mix-blend-multiply filter blur-xl opacity-70 animation-delay-4000 animate-blob dark:from-purple-700 dark:to-fuchsia-900 transition-all duration-500 ease-in-out"></div>

    <div class="p-8 sm:p-10 relative z-10">
      <div class="text-center mb-8">
        <svg class="mx-auto h-16 w-16 text-blue-600 dark:text-blue-400 transform transition-all duration-500 ease-in-out group-hover:scale-110" 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="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z"></path>
        </svg>
        <h2 class="text-3xl font-extrabold text-gray-900 dark:text-white mt-4 leading-tight group-hover:text-amber-500 dark:group-hover:text-indigo-400 transition-colors duration-500 ease-in-out">
          Two-Factor Authentication
        </h2>
        <p class="mt-2 text-sm text-gray-600 dark:text-gray-300 transition-colors duration-500 ease-in-out">
          Please enter the 6-digit code sent to your device.
        </p>
      </div>

      <form action="#" method="POST">
        <div class="space-y-6">
          <div class="flex justify-center space-x-2 sm:space-x-4">
            <input type="text" maxlength="1" class="w-12 h-16 sm:w-14 sm:h-18 p-0 text-center text-3xl font-bold rounded-xl border-2 border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-4 focus:ring-blue-400 focus:border-blue-500 dark:focus:ring-blue-600 dark:focus:border-blue-500 transition-all duration-300 ease-in-out shadow-sm group-hover:border-blue-500 dark:group-hover:border-blue-600 appearance-none [-moz-appearance:textfield] [&::-webkit-inner-spin-button]:-webkit-appearance-none [&::-webkit-outer-spin-button]:-webkit-appearance-none" inputmode="numeric" pattern="[0-9]*">
            <input type="text" maxlength="1" class="w-12 h-16 sm:w-14 sm:h-18 p-0 text-center text-3xl font-bold rounded-xl border-2 border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-4 focus:ring-blue-400 focus:border-blue-500 dark:focus:ring-blue-600 dark:focus:border-blue-500 transition-all duration-300 ease-in-out shadow-sm group-hover:border-blue-500 dark:group-hover:border-blue-600 appearance-none [-moz-appearance:textfield] [&::-webkit-inner-spin-button]:-webkit-appearance-none [&::-webkit-outer-spin-button]:-webkit-appearance-none" inputmode="numeric" pattern="[0-9]*">
            <input type="text" maxlength="1" class="w-12 h-16 sm:w-14 sm:h-18 p-0 text-center text-3xl font-bold rounded-xl border-2 border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-4 focus:ring-blue-400 focus:border-blue-500 dark:focus:ring-blue-600 dark:focus:border-blue-500 transition-all duration-300 ease-in-out shadow-sm group-hover:border-blue-500 dark:group-hover:border-blue-600 appearance-none [-moz-appearance:textfield] [&::-webkit-inner-spin-button]:-webkit-appearance-none [&::-webkit-outer-spin-button]:-webkit-appearance-none" inputmode="numeric" pattern="[0-9]*">
            <span class="h-full w-2 sm:w-4 flex items-center justify-center text-gray-400 dark:text-gray-500 text-4xl">-</span>
            <input type="text" maxlength="1" class="w-12 h-16 sm:w-14 sm:h-18 p-0 text-center text-3xl font-bold rounded-xl border-2 border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-4 focus:ring-blue-400 focus:border-blue-500 dark:focus:ring-blue-600 dark:focus:border-blue-500 transition-all duration-300 ease-in-out shadow-sm group-hover:border-blue-500 dark:group-hover:border-blue-600 appearance-none [-moz-appearance:textfield] [&::-webkit-inner-spin-button]:-webkit-appearance-none [&::-webkit-outer-spin-button]:-webkit-appearance-none" inputmode="numeric" pattern="[0-9]*">
            <input type="text" maxlength="1" class="w-12 h-16 sm:w-14 sm:h-18 p-0 text-center text-3xl font-bold rounded-xl border-2 border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-4 focus:ring-blue-400 focus:border-blue-500 dark:focus:ring-blue-600 dark:focus:border-blue-500 transition-all duration-300 ease-in-out shadow-sm group-hover:border-blue-500 dark:group-hover:border-blue-600 appearance-none [-moz-appearance:textfield] [&::-webkit-inner-spin-button]:-webkit-appearance-none [&::-webkit-outer-spin-button]:-webkit-appearance-none" inputmode="numeric" pattern="[0-9]*">
            <input type="text" maxlength="1" class="w-12 h-16 sm:w-14 sm:h-18 p-0 text-center text-3xl font-bold rounded-xl border-2 border-blue-300 dark:border-blue-700 bg-blue-50 dark:bg-gray-700 text-gray-900 dark:text-white focus:ring-4 focus:ring-blue-400 focus:border-blue-500 dark:focus:ring-blue-600 dark:focus:border-blue-500 transition-all duration-300 ease-in-out shadow-sm group-hover:border-blue-500 dark:group-hover:border-blue-600 appearance-none [-moz-appearance:textfield] [&::-webkit-inner-spin-button]:-webkit-appearance-none [&::-webkit-outer-spin-button]:-webkit-appearance-none" inputmode="numeric" pattern="[0-9]*">
          </div>

          <button type="submit" class="w-full flex justify-center py-4 px-6 border border-transparent rounded-full shadow-lg text-lg font-semibold text-white bg-gradient-to-r from-blue-500 to-blue-700 hover:from-blue-600 hover:to-blue-800 focus:outline-none focus:ring-4 focus:ring-blue-500 focus:ring-opacity-75 dark:from-blue-700 dark:to-blue-900 dark:hover:from-blue-600 dark:hover:to-blue-800 dark:focus:ring-blue-700 transition-all duration-300 ease-in-out transform hover:-translate-y-0.5 hover:scale-105 group-hover:shadow-2xl group-hover:shadow-blue-500/40 dark:group-hover:shadow-blue-900/60">
            Verify Code
          </button>
        </div>
      </form>

      <div class="mt-8 text-center text-sm">
        <p class="mb-2 text-gray-600 dark:text-gray-300 transition-colors duration-500 ease-in-out">
          Didn't receive the code?
        </p>
        <p>
          <a href="#" class="font-medium text-blue-600 hover:text-blue-800 dark:text-blue-400 dark:hover:text-blue-300 transition-colors duration-300 ease-in-out hover:underline group-hover:text-blue-700 dark:group-hover:text-blue-500">
            Resend Code
          </a>
          <span class="mx-2 text-gray-400 dark:text-gray-600">•</span>
          <a href="#" class="font-medium text-blue-600 hover:text-blue-800 dark:text-blue-400 dark:hover:text-blue-300 transition-colors duration-300 ease-in-out hover:underline group-hover:text-blue-700 dark:group-hover:text-blue-500">
            Use another method
          </a>
        </p>

        <div class="mt-8 pt-6 border-t border-blue-100 dark:border-blue-900/50 transition-colors duration-500 ease-in-out">
          <p class="text-xs text-gray-500 dark:text-gray-400">
            Having trouble? <a href="#" class="text-blue-500 hover:text-blue-700 dark:text-blue-400 dark:hover:text-blue-300 underline">Contact Support</a>
          </p>
        </div>
      </div>
    </div>
  </div>
</div>

<style>
  /* This is for the blob animation - Tailwind CSS doesn't support complex keyframe animations directly */
  @keyframes blob {
    0% {
      transform: translate(0px, 0px) scale(1);
    }
    33% {
      transform: translate(30px, -50px) scale(1.1);
    }
    66% {
      transform: translate(-20px, 20px) scale(0.9);
    }
    100% {
      transform: translate(0px, 0px) scale(1);
    }
  }

  .animate-blob {
    animation: blob 7s infinite cubic-bezier(0.6, -0.28, 0.735, 0.045);
  }

  .animation-delay-2000 {
    animation-delay: 2s;
  }

  .animation-delay-4000 {
    animation-delay: 4s;
  }

  /* Styles for input focus/auto-tabbing - requires JS for full functionality, but basic styling can be here */
  .space-x-2 > input:focus, .space-x-4 > input:focus {
    outline: none !important; /* Remove default outline */
  }
</style>