* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }
    .container {
      max-width: 1200px;
      width: 100%;
    }
    .header {
      text-align: center;
      color: white;
      margin-bottom: 60px;
    }
    .header h1 {
      font-size: 3.5rem;
      font-weight: 700;
      margin-bottom: 15px;
      text-shadow: 0 4px 10px rgba(0,0,0,0.2);
    }
    .header p {
      font-size: 1.3rem;
      opacity: 0.95;
      font-weight: 300;
    }
    .layout-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 30px;
      margin-bottom: 40px;
    }
    .layout-card {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 60px rgba(0,0,0,0.3);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      cursor: pointer;
    }
    .layout-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 30px 80px rgba(0,0,0,0.4);
    }
    .layout-preview {
      height: 300px;
      background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      position: relative;
      overflow: hidden;
    }
    .layout-preview.classic {
      background: linear-gradient(135deg, #f6f7fb 0%, #e8eaed 100%);
    }
    .layout-preview.modern {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }
    .layout-content {
      padding: 30px;
    }
    .layout-title {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #2f3a56;
    }
    .layout-description {
      color: #5f6b7a;
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .layout-features {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
    }
    .feature-tag {
      background: #f0f2f5;
      color: #5f6b7a;
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
    }
    .btn-select {
      display: inline-block;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: white;
      padding: 12px 30px;
      border-radius: 10px;
      text-decoration: none;
      font-weight: 600;
      transition: all 0.3s ease;
      border: none;
      width: 100%;
      text-align: center;
    }
    .btn-select:hover {
      transform: scale(1.05);
      box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
      color: white;
    }
    .footer-note {
      text-align: center;
      color: white;
      opacity: 0.8;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .header h1 {
        font-size: 2.5rem;
      }
      .layout-grid {
        grid-template-columns: 1fr;
      }
    }