:root {
            --primary-color: #1a1a1a;
            --accent-color: #fbbf24;
            --success-color: #16a34a;
            --border-color: #e5e7eb;
            --text-secondary: #6b7280;
            --bg-light: #f9fafb;
            --danger-color: #dc2626;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            color: var(--primary-color);
            line-height: 1.6;
        }
        
        /* Navbar */
        .navbar {
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
        }
        
        .navbar-brand {
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--primary-color) !important;
            letter-spacing: -0.5px;
        }
        
        .star-rating {
            color: var(--accent-color);
            font-size: 0.85rem;
            margin-left: 4px;
        }
        
        .nav-icons a {
            color: var(--primary-color);
            text-decoration: none;
            font-size: 1.2rem;
            transition: color 0.3s;
            position: relative;
        }
        
        .nav-icons a:hover {
            color: var(--accent-color);
        }
        
        .cart-badge {
            position: absolute;
            top: -8px;
            right: -8px;
            background: var(--danger-color);
            color: white;
            font-size: 0.65rem;
            padding: 2px 6px;
            border-radius: 10px;
            font-weight: 600;
        }
        
        /* Breadcrumb */
        .breadcrumb-section {
            background: var(--bg-light);
            padding: 12px 0;
        }
        
        .breadcrumb {
            margin: 0;
            background: transparent;
            padding: 0;
        }
        
        .breadcrumb-item a {
            color: var(--text-secondary);
            text-decoration: none;
        }
        
        .breadcrumb-item a:hover {
            color: var(--primary-color);
        }
        
        .breadcrumb-item.active {
            color: var(--primary-color);
        }
        
        /* Product Section */
        .product-section {
            padding: 40px 0;
        }
        
        .product-image-container {
            position: relative;
        }
        
        .wishlist-btn {
            position: absolute;
            top: 15px;
            right: 15px;
            background: white;
            border: none;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            box-shadow: 0 2px 8px rgba(0,0,0,0.15);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            z-index: 10;
        }
        
        .wishlist-btn:hover {
            background: var(--danger-color);
            color: white;
            transform: scale(1.1);
        }
        
        .wishlist-btn.active {
            background: var(--danger-color);
            color: white;
        }
        
        .product-image {
            width: 100%;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s;
        }
        
        .product-image:hover {
            transform: scale(1.02);
        }
        
        .thumbnail-container {
            display: flex;
            gap: 10px;
            margin-top: 15px;
            overflow-x: auto;
            padding: 5px 0;
        }
        
        .thumbnail {
            width: 80px;
            height: 80px;
            object-fit: cover;
            border-radius: 8px;
            cursor: pointer;
            border: 2px solid transparent;
            transition: all 0.3s;
            flex-shrink: 0;
        }
        
        .thumbnail:hover {
            border-color: var(--accent-color);
            transform: translateY(-2px);
        }
        
        .thumbnail.active {
            border-color: var(--primary-color);
            box-shadow: 0 2px 8px rgba(0,0,0,0.15);
        }
        
        /* Product Details */
        .product-title {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        
        .product-meta {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        
        .product-rating {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .rating-stars {
            color: var(--accent-color);
            font-size: 0.9rem;
        }
        
        .rating-count {
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        
        .product-sku {
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        
        .stock-badge {
            background: #dcfce7;
            color: var(--success-color);
            padding: 4px 12px;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 600;
        }
        
        .price-section {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 25px;
            flex-wrap: wrap;
        }
        
        .price-original {
            text-decoration: line-through;
            color: var(--text-secondary);
            font-size: 1.1rem;
        }
        
        .price-sale {
            color: var(--primary-color);
            font-size: 2rem;
            font-weight: 700;
        }
        
        .badge-sale {
            background-color: var(--danger-color);
            color: white;
            padding: 6px 14px;
            border-radius: 6px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        
        .discount-percent {
            color: var(--success-color);
            font-weight: 600;
            font-size: 0.9rem;
        }
        
        .form-label {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 10px;
            color: var(--primary-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .size-guide-link {
            color: var(--primary-color);
            font-size: 0.85rem;
            text-decoration: underline;
            font-weight: 400;
            cursor: pointer;
        }
        
        .size-guide-link:hover {
            color: var(--accent-color);
        }
        
        /* Size Selector Buttons */
        .size-selector {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        
        .size-btn {
            border: 2px solid var(--border-color);
            background: white;
            padding: 12px 20px;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
            min-width: 60px;
            text-align: center;
        }
        
        .size-btn:hover {
            border-color: var(--primary-color);
        }
        
        .size-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .size-btn.out-of-stock {
            opacity: 0.4;
            cursor: not-allowed;
            text-decoration: line-through;
        }
        
        /* Color Selector Buttons */
        .color-selector {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        
        .color-btn {
            width: 50px;
            height: 50px;
            border: 3px solid transparent;
            border-radius: 50%;
            cursor: pointer;
            transition: all 0.3s;
            position: relative;
        }
        
        .color-btn:hover {
            transform: scale(1.1);
            border-color: var(--primary-color);
        }
        
        .color-btn.active {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 2px white, 0 0 0 4px var(--primary-color);
        }
        
        .color-btn.black { background: #1a1a1a; }
        .color-btn.beige { background: #d4b896; }
        .color-btn.grey { background: #808080; }
        .color-btn.navy { background: #1e3a5f; }
        
        /* Quantity Selector */
        .quantity-selector {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .quantity-input-group {
            display: flex;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            width: fit-content;
        }
        
        .quantity-btn {
            background: white;
            border: none;
            padding: 12px 18px;
            font-size: 1.2rem;
            cursor: pointer;
            transition: all 0.3s;
            color: var(--primary-color);
            font-weight: 600;
        }
        
        .quantity-btn:hover {
            background: var(--bg-light);
        }
        
        .quantity-input {
            border: none;
            width: 60px;
            text-align: center;
            font-size: 1rem;
            font-weight: 600;
            border-left: 1px solid var(--border-color);
            border-right: 1px solid var(--border-color);
        }
        
        .quantity-input:focus {
            outline: none;
        }
        
        /* Delivery Info */
        .delivery-info {
            background: #dbeafe;
            border-left: 4px solid #3b82f6;
            padding: 12px 15px;
            border-radius: 6px;
            margin: 20px 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .delivery-info i {
            color: #3b82f6;
            font-size: 1.2rem;
        }
        
        .delivery-info p {
            margin: 0;
            font-size: 0.9rem;
            color: var(--primary-color);
        }
        
        /* Action Buttons */
        .btn-add-cart {
            background: white;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
            padding: 14px 24px;
            font-weight: 600;
            font-size: 1rem;
            border-radius: 8px;
            transition: all 0.3s;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        
        .btn-add-cart:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(26, 26, 26, 0.2);
        }
        
        .btn-buy-now {
            background: var(--success-color);
            color: white;
            padding: 14px 24px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            border-radius: 8px;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        
        .btn-buy-now:hover {
            background: #15803d;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
        }
        
        /* Trust Badges */
        .trust-badges {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            margin-top: 20px;
            padding: 20px;
            background: var(--bg-light);
            border-radius: 8px;
        }
        
        .trust-badge {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
        
        .trust-badge i {
            color: var(--success-color);
            font-size: 1.2rem;
        }
        
        /* Product Tabs */
        .product-tabs {
            margin-top: 40px;
        }
        
        .nav-tabs {
            border-bottom: 2px solid var(--border-color);
        }
        
        .nav-tabs .nav-link {
            color: var(--text-secondary);
            border: none;
            border-bottom: 3px solid transparent;
            padding: 12px 20px;
            font-weight: 600;
            transition: all 0.3s;
        }
        
        .nav-tabs .nav-link:hover {
            color: var(--primary-color);
            border-bottom-color: var(--accent-color);
        }
        
        .nav-tabs .nav-link.active {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
            background: transparent;
        }
        
        .tab-content {
            padding: 30px 0;
        }
        
        /* Product Features */
        .product-features p {
            margin-bottom: 12px;
            font-size: 0.95rem;
            line-height: 1.7;
            color: var(--primary-color);
        }
        
        .product-features p:last-child {
            margin-bottom: 0;
        }
        
        /* Reviews */
        .review-card {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 15px;
        }
        
        .review-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
        }
        
        .reviewer-name {
            font-weight: 600;
            color: var(--primary-color);
        }
        
        .review-date {
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        
        .review-rating {
            color: var(--accent-color);
            margin-bottom: 10px;
        }
        
        /* Share & Actions */
        .product-actions {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .btn-share,
        .btn-compare {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            color: var(--primary-color);
            padding: 10px 20px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .btn-share:hover,
        .btn-compare:hover {
            background: white;
            border-color: var(--primary-color);
            color: var(--primary-color);
        }
        
        /* Related Products */
        .related-products {
            padding: 60px 0;
            background: var(--bg-light);
        }
        
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 30px;
            color: var(--primary-color);
        }
        
        .related-product-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s;
            height: 100%;
        }
        
        .related-product-card:hover {
            box-shadow: 0 8px 24px rgba(0,0,0,0.12);
            transform: translateY(-4px);
        }
        
        .related-product-img-container {
            position: relative;
            overflow: hidden;
        }
        
        .related-product-img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            transition: transform 0.3s;
        }
        
        .related-product-card:hover .related-product-img {
            transform: scale(1.05);
        }
        
        .related-badge-sale {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--danger-color);
            color: white;
            padding: 6px 12px;
            border-radius: 6px;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
        }
        
        .related-product-content {
            padding: 20px;
        }
        
        .related-product-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--primary-color);
            margin: 0;
            line-height: 1.4;
        }
        
        /* Footer */
        .footer {
            background: var(--primary-color);
            color: white;
            padding: 50px 0 20px;
        }
        
        .footer h5 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        
        .footer ul {
            list-style: none;
            padding: 0;
        }
        
        .footer ul li {
            margin-bottom: 10px;
        }
        
        .footer ul li a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer ul li a:hover {
            color: white;
        }
        
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            color: white;
            text-decoration: none;
            transition: all 0.3s;
        }
        
        .social-links a:hover {
            background: var(--accent-color);
            transform: translateY(-2px);
        }
        
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 30px;
            padding-top: 20px;
            text-align: center;
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
        }
        
        /* Payment Methods */
        .payment-methods {
            display: flex;
            gap: 15px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        
        .payment-icon {
            background: white;
            padding: 8px 15px;
            border-radius: 6px;
            font-size: 1.5rem;
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .product-title {
                font-size: 1.5rem;
            }
            
            .price-sale {
                font-size: 1.5rem;
            }
            
            .product-section {
                padding: 20px 0;
            }
            
            .size-selector,
            .color-selector {
                gap: 8px;
            }
            
            .trust-badges {
                gap: 15px;
            }
        }