/* Reset and base styles */
      * { margin: 0; padding: 0; box-sizing: border-box; }
      body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #333; }
      
      /* Layout */
      .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
      .header { background: #2563eb; color: white; padding: 1rem 0; }
      .header h1 { font-size: 2rem; }
      .nav { background: #1e40af; padding: 0.5rem 0; }
      .nav ul { list-style: none; display: flex; gap: 2rem; }
      .nav a { color: white; text-decoration: none; }
      .nav a:hover { text-decoration: underline; }
      
      /* Content */
      .main { padding: 2rem 0; }
      .product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; margin: 2rem 0; }
      .product-card { border: 1px solid #e5e7eb; border-radius: 8px; padding: 1.5rem; background: white; }
      .product-card img { width: 100%; height: 200px; object-fit: cover; border-radius: 4px; margin-bottom: 1rem; }
      .product-card h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
      .product-card .price { font-size: 1.5rem; font-weight: bold; color: #2563eb; }
      .product-card .rating { color: #f59e0b; margin: 0.5rem 0; }
      .product-card .score { background: #10b981; color: white; padding: 0.25rem 0.5rem; border-radius: 4px; font-size: 0.875rem; }
      .btn { display: inline-block; background: #2563eb; color: white; padding: 0.75rem 1.5rem; border-radius: 4px; text-decoration: none; }
      .btn:hover { background: #1d4ed8; }
      
      /* Footer */
      .footer { background: #374151; color: white; padding: 2rem 0; margin-top: 3rem; text-align: center; }
      
      /* Responsive */
      @media (max-width: 768px) {
        .product-grid { grid-template-columns: 1fr; }
        .nav ul { flex-direction: column; gap: 1rem; }
      }