:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --accent-color: #fbbf24;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --border-color: #e5e7eb;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: var(--text-dark);
            background-color: #f9fafb;
        }

        .navbar {
            background: white;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            padding: 1rem 0;
        }

        /* Hero Section */
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 4rem 0;
            margin-bottom: 3rem;
        }

        .hero-title {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }

        .hero-subtitle {
            font-size: 1.25rem;
            opacity: 0.95;
        }

        /* Product Grid */
        .product-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
            height: 100%;
        }

        .product-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(37, 99, 235, 0.15);
        }

        .product-image-wrapper {
            position: relative;
            height: 250px;
            background: #f8f9fa;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .product-image {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
            padding: 1rem;
            transition: transform 0.3s ease;
        }

        .product-card:hover .product-image {
            transform: scale(1.1);
        }

        .product-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: #ef4444;
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
        }

        .product-info {
            padding: 1.5rem;
        }

        .product-category {
            color: var(--text-light);
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 0.5rem;
        }

        .product-name {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-dark);
        }

        .product-rating {
            color: var(--accent-color);
            font-size: 0.9rem;
            margin-bottom: 0.75rem;
        }

        .product-price {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        .product-original-price {
            font-size: 1rem;
            text-decoration: line-through;
            color: var(--text-light);
            margin-left: 8px;
        }

        /* Product Detail Page */
        .product-detail-page {
            display: none;
        }

        .product-container {
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.07);
            padding: 2rem;
            margin-top: 2rem;
            margin-bottom: 3rem;
        }

        .back-button {
            background: white;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
            padding: 0.75rem 1.5rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 2rem;
        }

        .back-button:hover {
            background: var(--primary-color);
            color: white;
        }

        .main-image-container {
            position: relative;
            background: #f8f9fa;
            border-radius: 8px;
            overflow: hidden;
            padding: 2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 400px;
        }

        .main-image {
            max-width: 100%;
            max-height: 450px;
            object-fit: contain;
            transition: transform 0.3s ease;
        }

        .main-image:hover {
            transform: scale(1.05);
        }

        .thumbnail-container {
            display: flex;
            gap: 10px;
            margin-top: 15px;
            flex-wrap: wrap;
        }

        .thumbnail {
            width: 80px;
            height: 80px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            cursor: pointer;
            object-fit: cover;
            transition: all 0.3s ease;
            background: #f8f9fa;
            padding: 5px;
        }

        .thumbnail:hover, .thumbnail.active {
            border-color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 4px 8px rgba(37, 99, 235, 0.2);
        }

        .product-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 1rem;
        }

        .price {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin: 1rem 0;
        }

        .original-price {
            font-size: 1.5rem;
            text-decoration: line-through;
            color: var(--text-light);
            margin-left: 10px;
        }

        .discount-badge {
            background: #ef4444;
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            display: inline-block;
            margin-left: 10px;
        }

        .rating-container {
            display: flex;
            align-items: center;
            gap: 10px;
            margin: 1rem 0;
        }

        .stars {
            color: var(--accent-color);
            font-size: 1.2rem;
        }

        .rating-text {
            color: var(--text-light);
            font-size: 0.95rem;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 1.5rem 0;
        }

        .feature-list li {
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
        }

        .feature-list li:last-child {
            border-bottom: none;
        }

        .feature-list li i {
            color: var(--primary-color);
            margin-right: 12px;
            font-size: 1.1rem;
        }

        .quantity-selector {
            display: flex;
            align-items: center;
            gap: 10px;
            margin: 1.5rem 0;
        }

        .qty-btn {
            width: 40px;
            height: 40px;
            border: 2px solid var(--border-color);
            background: white;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
        }

        .qty-btn:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
            transform: scale(1.1);
        }

        .qty-input {
            width: 60px;
            text-align: center;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            padding: 8px;
            font-weight: 600;
        }

        .add-to-cart-btn {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 1rem 3rem;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
            width: 100%;
            margin-top: 1rem;
        }

        .add-to-cart-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
        }

        .buy-now-btn {
            background: white;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
            padding: 1rem 3rem;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            width: 100%;
            margin-top: 0.5rem;
        }

        .buy-now-btn:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }

        .review-section {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 2px solid var(--border-color);
        }

        .review-card {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 1rem;
            transition: transform 0.3s ease;
        }

        .review-card:hover {
            transform: translateX(5px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }

        .review-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.75rem;
        }

        .reviewer-name {
            font-weight: 600;
            color: var(--text-dark);
        }

        .review-date {
            color: var(--text-light);
            font-size: 0.85rem;
        }

        .review-stars {
            color: var(--accent-color);
            margin: 0.5rem 0;
        }

        .specs-table {
            margin: 2rem 0;
        }

        .specs-table td {
            padding: 12px;
            border-bottom: 1px solid var(--border-color);
        }

        .specs-table td:first-child {
            font-weight: 600;
            width: 30%;
        }

        .toast-notification {
            position: fixed;
            top: 20px;
            right: 20px;
            background: #10b981;
            color: white;
            padding: 1rem 1.5rem;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            z-index: 1000;
            animation: slideIn 0.3s ease;
            display: none;
        }

        @keyframes slideIn {
            from {
                transform: translateX(400px);
                opacity: 0;
            }
            to {
                transform: translateX(0);
                opacity: 1;
            }
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: var(--text-dark);
        }

        .in-stock {
            color: #10b981;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .shipping-info {
            background: #eff6ff;
            border-left: 4px solid var(--primary-color);
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
        }

        .category-filter {
            display: flex;
            gap: 10px;
            margin-bottom: 2rem;
            flex-wrap: wrap;
            justify-content: center;
        }

        .category-btn {
            padding: 0.75rem 1.5rem;
            border: 2px solid var(--border-color);
            background: white;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
        }

        .category-btn:hover, .category-btn.active {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-2px);
        }

        /* Cart Sidebar */
        .cart-sidebar {
            position: fixed;
            right: -400px;
            top: 0;
            width: 400px;
            height: 100%;
            background: white;
            box-shadow: -2px 0 10px rgba(0,0,0,0.1);
            transition: right 0.3s ease;
            z-index: 2000;
            overflow-y: auto;
        }

        .cart-sidebar.active {
            right: 0;
        }

        .cart-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            display: none;
            z-index: 1999;
        }

        .cart-overlay.active {
            display: block;
        }

        .cart-header {
            padding: 1.5rem;
            border-bottom: 2px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--primary-color);
            color: white;
        }

        .cart-header h2 {
            margin: 0;
            font-size: 1.5rem;
        }

        .close-cart {
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            transition: transform 0.3s ease;
        }

        .close-cart:hover {
            transform: scale(1.2);
        }

        .cart-items {
            padding: 1rem;
            min-height: calc(100vh - 200px);
        }

        .cart-item {
            display: flex;
            gap: 1rem;
            padding: 1rem;
            border-bottom: 1px solid var(--border-color);
            align-items: center;
        }

        .cart-item-image {
            width: 80px;
            height: 80px;
            object-fit: contain;
            border-radius: 8px;
            background: #f8f9fa;
            padding: 5px;
        }

        .cart-item-details {
            flex: 1;
        }

        .cart-item-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
            font-size: 0.95rem;
        }

        .cart-item-price {
            color: var(--primary-color);
            font-weight: 700;
        }

        .cart-item-qty {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-top: 0.5rem;
        }

        .cart-qty-btn {
            width: 30px;
            height: 30px;
            border: 1px solid var(--border-color);
            background: white;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .cart-qty-btn:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }

        .remove-item {
            background: #ef4444;
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            cursor: pointer;
            font-size: 0.85rem;
            transition: all 0.3s ease;
        }

        .remove-item:hover {
            background: #dc2626;
            transform: translateY(-2px);
        }

        .cart-footer {
            position: sticky;
            bottom: 0;
            left: 0;
            right: 0;
            background: white;
            border-top: 2px solid var(--border-color);
            padding: 1.5rem;
        }

        .cart-total {
            display: flex;
            justify-content: space-between;
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-dark);
        }

        .checkout-btn {
            width: 100%;
            padding: 1rem;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .checkout-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
        }

        .empty-cart {
            text-align: center;
            padding: 3rem 1rem;
        }

        .empty-cart i {
            font-size: 4rem;
            color: var(--text-light);
            margin-bottom: 1rem;
        }

        .empty-cart p {
            color: var(--text-light);
            font-size: 1.1rem;
        }


        @media (max-width: 768px) {
            .hero-title {
                font-size: 2rem;
            }
            .cart-sidebar {
                width: 100%;
                right: -100%;
            }
        }