ローダーコンポーネント

<div class="flex flex-col items-center justify-center min-h-screen bg-gray-100 dark:bg-gray-900 p-4">

  <!-- Component: Complex Material Design Loader for Portfolio -->
  <div class="w-full max-w-2xl bg-white dark:bg-gray-800 rounded-lg shadow-xl p-8 space-y-8 animate-fade-in">

    <!-- Header/Title Section -->
    <div class="flex items-center justify-between pb-4 border-b border-gray-200 dark:border-gray-700">
      <h2 class="text-3xl font-extrabold text-blue-600 dark:text-blue-400 capitalize">Portfolio Showcase Loading</h2>
      <div class="flex space-x-2">
        <div class="w-8 h-8 bg-purple-500 dark:bg-purple-600 rounded-full animate-pulse"></div>
        <div class="w-8 h-8 bg-green-500 dark:bg-green-600 rounded-full animate-pulse delay-75"></div>
      </div>
    </div>

    <!-- Project/Item Loading Cards (Grid Layout) -->
    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">

      <!-- Loading Card 1 -->
      <div class="bg-gray-50 dark:bg-gray-700 rounded-lg p-6 shadow-md animate-pulse-slow">
        <div class="w-full h-40 bg-gray-200 dark:bg-gray-600 rounded-md mb-4"></div>
        <div class="h-6 bg-gray-200 dark:bg-gray-600 rounded w-3/4 mb-2"></div>
        <div class="h-4 bg-gray-200 dark:bg-gray-600 rounded w-1/2"></div>
      </div>

      <!-- Loading Card 2 -->
      <div class="bg-gray-50 dark:bg-gray-700 rounded-lg p-6 shadow-md animate-pulse-slow delay-150">
        <div class="w-full h-40 bg-gray-200 dark:bg-gray-600 rounded-md mb-4"></div>
        <div class="h-6 bg-gray-200 dark:bg-gray-600 rounded w-3/4 mb-2"></div>
        <div class="h-4 bg-gray-200 dark:bg-gray-600 rounded w-1/2"></div>
      </div>

      <!-- Loading Card 3 -->
      <div class="bg-gray-50 dark:bg-gray-700 rounded-lg p-6 shadow-md animate-pulse-slow delay-300">
        <div class="w-full h-40 bg-gray-200 dark:bg-gray-600 rounded-md mb-4"></div>
        <div class="h-6 bg-gray-200 dark:bg-gray-600 rounded w-3/4 mb-2"></div>
        <div class="h-4 bg-gray-200 dark:bg-gray-600 rounded w-1/2"></div>
      </div>

      <!-- Loading Card 4 (for larger screens) -->
      <div class="hidden lg:block bg-gray-50 dark:bg-gray-700 rounded-lg p-6 shadow-md animate-pulse-slow delay-[450ms]">
        <div class="w-full h-40 bg-gray-200 dark:bg-gray-600 rounded-md mb-4"></div>
        <div class="h-6 bg-gray-200 dark:bg-gray-600 rounded w-3/4 mb-2"></div>
        <div class="h-4 bg-gray-200 dark:bg-gray-600 rounded w-1/2"></div>
      </div>

    </div>

    <!-- Progress Bar Section -->
    <div class="space-y-4">
      <div class="h-4 bg-gray-200 dark:bg-gray-700 rounded-full overflow-hidden">
        <div class="h-full w-2/3 bg-gradient-to-r from-blue-500 to-green-400 dark:from-blue-600 dark:to-green-500 rounded-full animate-progress-fill"></div>
      </div>
      <p class="text-center text-gray-600 dark:text-gray-400 text-sm">Loading portfolio items... Please wait.</p>
    </div>

    <!-- Call to Action / Interactive Elements (Placeholder) -->
    <div class="flex flex-col sm:flex-row items-center justify-center space-y-4 sm:space-y-0 sm:space-x-4">
      <button class="w-full sm:w-auto px-8 py-3 bg-fuchsia-500 dark:bg-fuchsia-600 text-white font-semibold rounded-full shadow-lg hover:shadow-xl transition duration-300 ease-in-out transform hover:-translate-y-1 animate-bounce-slow">
        <div class="flex items-center justify-center space-x-2">
          <svg class="w-5 h-5 animate-spin" fill="none" viewBox="0 0 24 24">
            <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
            <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
          </svg>
          <span>Processing Data</span>
        </div>
      </button>
      <button class="w-full sm:w-auto px-8 py-3 bg-gray-200 dark:bg-gray-700 text-gray-800 dark:text-gray-200 font-semibold rounded-full shadow-lg hover:shadow-xl transition duration-300 ease-in-out transform hover:-translate-y-1">
        <span class="animate-pulse">Fetching Assets</span>
      </button>
    </div>

  </div>

  <!-- Tailwind CSS Customizations (Animations) -->
  <style>
    @keyframes fade-in {
      from { opacity: 0; transform: translateY(-20px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .animate-fade-in {
      animation: fade-in 0.8s ease-out forwards; 
    }

    @keyframes pulse-slow {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.7; }
    }
    .animate-pulse-slow {
      animation: pulse-slow 2s infinite ease-in-out;
    }

    @keyframes progress-fill {
      0% { width: 0%; }
      100% { width: 66.66%; } /* Simulating 2/3 progress */
    }
    .animate-progress-fill {
      animation: progress-fill 1.5s ease-out forwards;
    }
    
    @keyframes bounce-slow {
      0%, 100% { transform: translateY(0); }
      25% { transform: translateY(-5px); }
      50% { transform: translateY(0); }
      75% { transform: translateY(-2px); }
      100% { transform: translateY(0); }
    }
    .animate-bounce-slow {
        animation: bounce-slow 4s infinite ease-in-out;
    }

  </style>

</div>