CAPTCHAコンポーネント

<div class="flex items-center justify-center min-h-screen p-4 bg-gray-100 dark:bg-gray-900 font-sans">
  <div class="w-full max-w-sm p-6 bg-white dark:bg-gray-800 rounded-lg shadow-xl border border-gray-200 dark:border-gray-700 space-y-6 md:p-8">
    <h2 class="text-2xl font-bold tracking-tight text-gray-900 dark:text-white text-center sm:text-3xl lg:text-4xl">
      Security Check
    </h2>
    <p class="text-sm text-gray-600 dark:text-gray-300 text-center leading-relaxed mb-4">
      Please complete the security check to proceed.
    </p>

    <div class="space-y-4">
      <!-- CAPTCHA Display Area -->
      <div class="relative bg-gradient-to-r from-red-500 via-pink-500 to-purple-500 p-1 rounded-md shadow-inner">
        <div class="w-full h-24 sm:h-32 flex items-center justify-center bg-gray-200 dark:bg-gray-700 rounded-md overflow-hidden relative">
          <span class="text-4xl sm:text-5xl lg:text-6xl font-extrabold text-blue-800 dark:text-blue-200 tracking-widest leading-none select-none italic transform -rotate-6">
            kL5pQRt9
          </span>
          <!-- Noise Overlay -->
          <div class="absolute inset-0 bg-gradient-to-br from-transparent to-black opacity-10 dark:opacity-20 pointer-events-none"></div>
          <div class="absolute inset-0 flex items-center justify-center p-2">
            <!-- Placeholder lines or distortions -->
            <div class="w-full h-px bg-yellow-400 absolute top-1/3 left-0 transform rotate-3"></div>
            <div class="w-full h-px bg-green-400 absolute bottom-1/4 right-0 transform -rotate-5"></div>
          </div>
        </div>
      </div>

      <!-- Input Field -->
      <div>
        <label for="captcha-input" class="sr-only">Enter CAPTCHA here</label>
        <input type="text" id="captcha-input" placeholder="Enter the text above" class="w-full p-3 sm:p-4 border border-blue-400 dark:border-blue-600 rounded-md focus:ring-4 focus:ring-blue-300 dark:focus:ring-blue-800 focus:border-blue-500 dark:focus:border-blue-700 dark:bg-gray-700 dark:text-white placeholder-gray-500 dark:placeholder-gray-400 outline-none text-base sm:text-lg tracking-wider transition-all duration-200 ease-in-out">
      </div>

      <!-- Action Buttons -->
      <div class="grid grid-cols-2 gap-3 sm:gap-4 md:flex md:justify-end md:space-x-4">
        <button type="button" class="w-full md:w-auto p-3 sm:p-4 text-center text-sm sm:text-base font-medium rounded-md focus:outline-none focus:ring-4 transition-all duration-200 ease-in-out
          bg-blue-100 text-blue-800 dark:bg-blue-900 dark:text-blue-200 hover:bg-blue-200 dark:hover:bg-blue-800 focus:ring-blue-300 dark:focus:ring-blue-800 shadow-sm">
          <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5 sm:h-6 sm:w-6 inline-block mr-2" viewBox="0 0 20 20" fill="currentColor">
            <path fill-rule="evenodd" d="M4 2a1 1 0 011 1v2.101a7.002 7.002 0 0111.601 2.566 1 1 0 11-1.885.666A5.002 5.002 0 005 7c-1.378 0-2.684.254-3.86-.713a1 1 0 010-1.419A1 1 0 012 4h-.002zm14 8a1 1 0 01-1 1v2.101a7.002 7.002 0 01-11.601 2.566 1 1 0 111.885.666A5.002 5.002 0 0015 13c1.378 0 2.684.254 3.86.713a1 1 0 010 1.419A1 1 0 0118 16h-.002z" clip-rule="evenodd" />
          </svg>
          Refresh
        </button>

        <button type="submit" class="w-full md:w-auto p-3 sm:p-4 text-center text-sm sm:text-base font-semibold rounded-md focus:outline-none focus:ring-4 transition-all duration-200 ease-in-out
          bg-gradient-to-r from-teal-500 to-emerald-600 text-white hover:from-teal-600 hover:to-emerald-700 focus:ring-teal-300 dark:focus:ring-teal-800 shadow-lg">
          Verify
          <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5 sm:h-6 sm:w-6 inline-block ml-2" viewBox="0 0 20 20" fill="currentColor">
            <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clip-rule="evenodd" />
          </svg>
        </button>
      </div>
    </div>

    <div class="pt-4 border-t border-gray-200 dark:border-gray-700 text-center">
      <p class="text-xs text-gray-500 dark:text-gray-400">
        Having trouble? <a href="#" class="text-blue-600 dark:text-blue-400 hover:underline font-medium">Contact support</a>
      </p>
    </div>
  </div>
</div>