CAPTCHAコンポーネント

<div class="flex items-center justify-center min-h-screen bg-gradient-to-br from-purple-500 via-pink-500 to-red-500 dark:from-gray-900 dark:via-gray-800 dark:to-gray-700 p-4">
  <div class="bg-white bg-opacity-10 dark:bg-gray-800 dark:bg-opacity-20 backdrop-filter backdrop-blur-lg rounded-xl shadow-2xl p-8 w-full max-w-md border border-white border-opacity-20 dark:border-gray-700 dark:border-opacity-30 transform transition-all duration-300 hover:scale-105">
    <h2 class="text-3xl font-bold text-white dark:text-gray-100 mb-6 text-center drop-shadow-lg">Verify You Are Human</h2>

    <div class="flex flex-col md:flex-row items-center justify-between bg-white bg-opacity-15 dark:bg-gray-700 dark:bg-opacity-30 rounded-lg p-4 mb-6 shadow-inner border border-white border-opacity-20 dark:border-gray-600">
      <img src="https://picsum.photos/id/1025/100/50" alt="CAPTCHA Image" class="rounded-md mb-4 md:mb-0 md:mr-4 shadow-md">
      <div class="flex-grow">
        <p class="text-white dark:text-gray-200 text-sm mb-2">Click the image that contains a <b>bicycle</b>.</p>
        <div class="grid grid-cols-3 gap-2">
          <img src="https://picsum.photos/id/237/80/80" alt="Option 1" class="w-full h-20 object-cover rounded-md cursor-pointer border-2 border-transparent hover:border-blue-300 transition-all duration-200 shadow-sm">
          <img src="https://picsum.photos/id/190/80/80" alt="Option 2" class="w-full h-20 object-cover rounded-md cursor-pointer border-2 border-transparent hover:border-blue-300 transition-all duration-200 shadow-sm">
          <img src="https://picsum.photos/id/257/80/80" alt="Option 3" class="w-full h-20 object-cover rounded-md cursor-pointer border-2 border-transparent hover:border-blue-300 transition-all duration-200 shadow-sm">
          <img src="https://picsum.photos/id/214/80/80" alt="Option 4" class="w-full h-20 object-cover rounded-md cursor-pointer border-2 border-transparent hover:border-blue-300 transition-all duration-200 shadow-sm">
          <img src="https://picsum.photos/id/286/80/80" alt="Option 5" class="w-full h-20 object-cover rounded-md cursor-pointer border-2 border-transparent hover:border-blue-300 transition-all duration-200 shadow-sm">
          <img src="https://picsum.photos/id/27/80/80" alt="Option 6" class="w-full h-20 object-cover rounded-md cursor-pointer border-2 border-transparent hover:border-blue-300 transition-all duration-200 shadow-sm">
        </div>
      </div>
    </div>

    <div class="flex items-center text-white dark:text-gray-200 mb-6">
      <input type="checkbox" id="robot-check" class="form-checkbox h-5 w-5 text-blue-400 bg-white bg-opacity-30 dark:bg-gray-600 dark:bg-opacity-50 border-white border-opacity-30 dark:border-gray-500 rounded-md focus:ring-blue-400 mr-3">
      <label for="robot-check" class="text-sm select-none">I'm not a robot</label>
    </div>

    <button class="w-full py-3 bg-blue-500 hover:bg-blue-600 text-white font-bold rounded-lg shadow-lg transform transition-transform duration-200 hover:scale-105 focus:outline-none focus:ring-4 focus:ring-blue-300 focus:ring-opacity-75 dark:bg-blue-600 dark:hover:bg-blue-700 dark:focus:ring-blue-800">
      Verify
    </button>

    <p class="text-white dark:text-gray-300 text-xs text-center mt-4 opacity-75">Verification helps keep our community safe.</p>
  </div>
</div>