* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f8fafc;
            color: #334155;
            line-height: 1.6;
            padding: 0;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            margin-top: 30px;
            margin-bottom: 30px;
        }
        
        header {
            background: linear-gradient(135deg, #1e293b, #334155);
            color: white;
            padding: 50px 40px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        header::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100" opacity="0.05"><path d="M0 0h100v100H0z" fill="white"/><path d="M20 20h60v60H20z" stroke="white" stroke-width="2" fill="none"/></svg>');
            background-size: 80px 80px;
        }
        
        h1 {
            font-size: 42px;
            margin-bottom: 15px;
            font-weight: 700;
            letter-spacing: 0.5px;
            position: relative;
        }
        
        .subtitle {
            font-size: 20px;
            opacity: 0.9;
            font-weight: 300;
            max-width: 600px;
            margin: 0 auto;
            position: relative;
        }
        
        .product-container {
            display: flex;
            flex-wrap: wrap;
            padding: 40px;
        }
        
        .product-images {
            flex: 1;
            min-width: 320px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .main-image {
            width: 100%;
            height: 300px;
            object-fit: cover;
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
            margin-bottom: 25px;
        }
        
        .image-gallery {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            width: 100%;
        }
        
        .image-gallery img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            cursor: pointer;
        }
        
        .image-gallery img:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
        }
        
        .product-info {
            flex: 1;
            min-width: 320px;
            padding: 20px;
            display: flex;
            flex-direction: column;
        }
        
        h2 {
            color: #1e293b;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid #e2e8f0;
            font-weight: 600;
            font-size: 28px;
        }
        
        .product-info p {
            margin-bottom: 30px;
            font-size: 17px;
            color: #475569;
            line-height: 1.7;
        }
        
        .features {
            margin: 25px 0;
        }
        
        .feature-list {
            list-style: none;
            margin-top: 20px;
        }
        
        .feature-list li {
            padding: 15px 0;
            border-bottom: 1px solid #f1f5f9;
            display: flex;
            align-items: flex-start;
            transition: background-color 0.2s;
        }
        
        .feature-list li:hover {
            background-color: #f8fafc;
            padding-left: 10px;
            border-radius: 8px;
        }
        
        .feature-list li:last-child {
            border-bottom: none;
        }
        
        .feature-icon {
            color: #3b82f6;
            margin-right: 15px;
            font-size: 20px;
            margin-top: 2px;
            flex-shrink: 0;
        }
        
        .feature-text {
            flex: 1;
        }
        
        .feature-text strong {
            color: #1e293b;
            display: block;
            margin-bottom: 5px;
            font-size: 17px;
        }
        
        .specs {
            background: #f8fafc;
            padding: 25px;
            border-radius: 12px;
            margin: 25px 0;
            border-left: 4px solid #3b82f6;
        }
        
        .specs-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-top: 15px;
        }
        
        .spec-item {
            padding: 10px 0;
            display: flex;
            border-bottom: 1px solid #e2e8f0;
        }
        
        .spec-item:last-child {
            border-bottom: none;
        }
        
        .spec-name {
            font-weight: 600;
            color: #334155;
            min-width: 150px;
        }
        
        .certification {
            display: flex;
            align-items: center;
            margin-top: 25px;
            padding: 20px;
            background: linear-gradient(to right, #f0f9ff, #e0f2fe);
            border-radius: 10px;
            border: 1px solid #bae6fd;
        }
        
        .cert-badge {
            background: #0ea5e9;
            color: white;
            padding: 10px 18px;
            border-radius: 20px;
            font-size: 14px;
            margin-right: 20px;
            font-weight: 600;
            display: flex;
            align-items: center;
        }
        
        .cert-badge i {
            margin-right: 8px;
        }
        
        .dimension-visual {
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 20px 0;
            padding: 15px;
            background: #f8fafc;
            border-radius: 10px;
        }
        
        .dimension-box {
            width: 120px;
            height: 65px;
            background: #3b82f6;
            border-radius: 8px;
            position: relative;
            margin: 0 20px;
            box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
        }
        
        .dimension-label {
            text-align: center;
            font-size: 14px;
            color: #475569;
            margin-top: 10px;
        }
        
        footer {
            text-align: center;
            padding: 25px;
            background: #1e293b;
            color: #cbd5e1;
            font-size: 14px;
        }
        
        @media (max-width: 900px) {
            .product-container {
                flex-direction: column;
                padding: 30px 20px;
            }
            
            .image-gallery {
                grid-template-columns: 1fr;
            }
            
            .specs-grid {
                grid-template-columns: 1fr;
            }
            
            h1 {
                font-size: 34px;
            }
            
            .main-image {
                height: 250px;
            }
            
            .dimension-visual {
                flex-direction: column;
            }
            
            .dimension-box {
                margin: 10px 0;
            }
        }
        
        @media (max-width: 480px) {
            header {
                padding: 40px 20px;
            }
            
            h1 {
                font-size: 28px;
            }
            
            .subtitle {
                font-size: 18px;
            }
            
            .product-container {
                padding: 20px 15px;
            }
            
            .certification {
                flex-direction: column;
                text-align: center;
            }
            
            .cert-badge {
                margin-right: 0;
                margin-bottom: 15px;
            }
        }