* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            line-height: 1.6;
            color: #333;
            background: #f5f5f5;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background: #fff;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            color: #2563eb;
            text-decoration: none;
        }
        
        .nav-links {
            display: flex;
            gap: 20px;
        }
        
        .nav-links a {
            color: #666;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: #2563eb;
        }
        
        .breadcrumb {
            padding: 15px 0;
            font-size: 14px;
            color: #666;
        }
        
        .breadcrumb a {
            color: #666;
            text-decoration: none;
        }
        
        .breadcrumb a:hover {
            color: #2563eb;
        }
        
        .product-card {
            background: #fff;
            border-radius: 10px;
            padding: 30px;
            margin: 20px 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        
        .product-title {
            font-size: 28px;
            font-weight: bold;
            margin-bottom: 20px;
            color: #333;
        }
        
        .product-image {
            width: 100%;
            max-width: 120px;
            height: auto;
            border-radius: 8px;
            margin-bottom: 20px;
        }
        
        .product-desc {
            font-size: 16px;
            line-height: 1.8;
            color: #666;
            margin-bottom: 20px;
        }
        
        .product-features {
            margin: 20px 0;
            padding: 20px;
            background: #f9f9f9;
            border-radius: 8px;
        }
        
        .product-features h3 {
            font-size: 18px;
            margin-bottom: 15px;
            color: #333;
        }
        
        .product-features ul {
            list-style: none;
        }
        
        .product-features li {
            padding: 8px 0;
            padding-left: 20px;
            position: relative;
        }
        
        .product-features li:before {
            content: "✓";
            position: absolute;
            left: 0;
            color: #2563eb;
            font-weight: bold;
        }
        
        .product-price {
            font-size: 32px;
            font-weight: bold;
            color: #dc2626;
            margin: 20px 0;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 120px;
            border-radius: 5px;
            text-decoration: none;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s;
            margin-right: 10px;
        }
        
        .btn-primary {
            background: #2563eb;
            color: #fff;
        }
        
        .btn-primary:hover {
            background: #1d4ed8;
        }
        
        .btn-secondary {
            background: #fff;
            color: #2563eb;
            border: 2px solid #2563eb;
        }
        
        .btn-secondary:hover {
            background: #2563eb;
            color: #fff;
        }
        
        .links-section {
            background: #fff;
            border-radius: 10px;
            padding: 30px;
            margin: 30px 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        
        .links-section h2 {
            font-size: 24px;
            margin-bottom: 20px;
            color: #333;
        }
        
        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }
        
        .link-card {
            padding: 20px;
            border: 1px solid #e5e7eb;
            border-radius: 8px;
            transition: all 0.3s;
            text-decoration: none;
            color: #333;
            display: block;
        }
        
        .link-card:hover {
            border-color: #2563eb;
            box-shadow: 0 4px 12px rgba(37,99,235,0.15);
            transform: translateY(-2px);
        }
        
        .link-card h3 {
            font-size: 16px;
            margin-bottom: 10px;
            color: #2563eb;
        }
        
        .link-card p {
            font-size: 14px;
            color: #666;
        }
        
        footer {
            background: #1f2937;
            color: #fff;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-section h3 {
            font-size: 18px;
            margin-bottom: 20px;
            color: #fff;
        }
        
        .footer-section p {
            font-size: 14px;
            color: #9ca3af;
            line-height: 1.6;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #9ca3af;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #fff;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #374151;
            color: #9ca3af;
            font-size: 14px;
        }
        
        .footer-bottom a {
            color: #9ca3af;
            text-decoration: none;
        }
        
        .footer-bottom a:hover {
            color: #fff;
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 15px;
            }
            
            .nav-links {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .product-title {
                font-size: 24px;
            }
            
            .links-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }