/* Main Content */
        .main-content {
            margin-top: 80px;
            padding: 40px 0;
        }

        /* Breadcrumb */
        .breadcrumb {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            padding: 15px 30px;
            border-radius: 10px;
            margin-bottom: 30px;
        }

        .breadcrumb a {
            color: #666;
            text-decoration: none;
            margin-right: 10px;
        }

        .breadcrumb a:hover {
            color: #e74c3c;
        }

        .breadcrumb .current {
            color: #e74c3c;
            font-weight: 600;
        }

        /* Product Detail */
        .product-detail {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-bottom: 40px;
        }

        .product-header {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            padding: 40px;
        }

        .product-gallery {
            position: relative;
            max-width: 520px;
        }

        .main-image {
            width: 100%;
            height: 400px;
            background-size: cover;
            background-position: center;
            border-radius: 15px;
            margin-bottom: 20px;
            position: relative;
        }

        .product-badge {
            position: absolute;
            top: 20px;
            right: 20px;
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
            padding: 8px 16px;
            border-radius: 25px;
            font-size: 0.9rem;
            font-weight: bold;
        }

        .thumbnail-gallery {
            display: flex;
            gap: 10px;
            overflow-x: auto;
        }

        .thumbnail {
            width: 80px;
            height: 60px;
            background-size: cover;
            background-position: center;
            border-radius: 8px;
            cursor: pointer;
            opacity: 0.7;
            transition: opacity 0.3s;
            flex-shrink: 0;
        }

        .thumbnail.active,
        .thumbnail:hover {
            opacity: 1;
            border: 2px solid #e74c3c;
        }

        .product-info {
            padding: 20px 0;
        }

        .product-category {
            color: #e74c3c;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .product-title {
            font-size: 2.5rem;
            font-weight: bold;
            color: #2c3e50;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        .product-price {
            font-size: 2rem;
            font-weight: bold;
            color: #e74c3c;
            margin-bottom: 20px;
        }

        .product-manufacturer {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
            padding: 12px 20px;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: 10px;
            border-left: 4px solid #3498db;
        }

        .manufacturer-label {
            color: #7f8c8d;
            font-size: 0.95rem;
            font-weight: 600;
        }

        .manufacturer-name {
            color: #2c3e50;
            font-size: 1.1rem;
            font-weight: 600;
        }

        .product-rating {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .stars {
            color: #f39c12;
        }

        .rating-text {
            color: #666;
            font-size: 0.9rem;
        }

        .product-description {
            color: #666;
            line-height: 1.8;
            margin-bottom: 30px;
            font-size: 1.1rem;
        }

        .key-features {
            margin-bottom: 30px;
        }

        .key-features h3 {
            color: #2c3e50;
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        .features-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        .feature-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
        }

        .feature-item i {
            color: #e74c3c;
            width: 20px;
        }

        .product-actions {
            display: flex;
            gap: 15px;
            margin-bottom: 30px;
        }

        .btn {
            padding: 15px 30px;
            border: none;
            border-radius: 30px;
            cursor: pointer;
            font-weight: 600;
            text-decoration: none;
            text-align: center;
            transition: all 0.3s;
            font-size: 1rem;
            flex: 1;
        }

        .btn-primary {
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(231, 76, 60, 0.3);
        }

        .btn-secondary {
            background: transparent;
            color: #e74c3c;
            border: 2px solid #e74c3c;
        }

        .btn-secondary:hover {
            background: #e74c3c;
            color: white;
        }

        .btn-outline {
            background: transparent;
            color: #2c3e50;
            border: 2px solid #2c3e50;
        }

        .btn-outline:hover {
            background: #2c3e50;
            color: white;
        }
        
        .btn-similar {
            background: linear-gradient(135deg, #ff9800, #ff5722);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(255, 152, 0, 0.3);
        }
        
        .btn-similar:hover {
            background: linear-gradient(135deg, #ff5722, #e64a19);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 152, 0, 0.4);
        }
        
        .btn-similar:active {
            transform: translateY(1px);
        }

        .contact-ab-info {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #e74c3c;
        }

        .contact-ab-info h4 {
            color: #2c3e50;
            margin-bottom: 10px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 8px;
        }

        .contact-item i {
            color: #e74c3c;
            width: 20px;
        }

        /* Specifications */
        .specifications {
            padding: 40px;
            border-top: 1px solid #eee;
        }

        .specifications h2 {
            color: #2c3e50;
            margin-bottom: 30px;
            font-size: 2rem;
        }

        .specs-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .spec-category {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 15px;
            border-left: 4px solid #e74c3c;
        }

        .spec-category h3 {
            color: #2c3e50;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }

        .spec-list {
            list-style: none;
        }

        .spec-list li {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid #ddd;
        }

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

        .spec-label {
            font-weight: 600;
            color: #2c3e50;
        }

        .spec-value {
            color: #666;
        }

        /* Related Products */
        .related-products {
            margin-top: 60px;
        }

        .related-products h2 {
            color: white;
            text-align: center;
            margin-bottom: 40px;
            font-size: 2.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .related-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s;
        }

        .related-card:hover {
            transform: translateY(-5px);
        }

        .related-image {
            width: 100%;
            height: 200px;
            background-size: cover;
            background-position: center;
        }

        .related-info {
            padding: 20px;
        }

        .related-title {
            font-size: 1.2rem;
            font-weight: bold;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        .related-price {
            font-size: 1.1rem;
            font-weight: bold;
            color: #e74c3c;
            margin-bottom: 15px;
        }

        .related-btn {
            display: block;
            text-align: center;
            text-decoration: none;
            width: 100%;
            padding: 10px;
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
            border: none;
            border-radius: 20px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }

        .related-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
        }

        /* 相似产品模态框样式 */
        .similar-products-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }

        .similar-products-modal {
            background: #fff;
            width: 90%;
            max-width: 1000px;
            max-height: 90vh;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 30px rgba(0, 0, 0, 0.2);
            animation: modalFadeIn 0.3s ease;
        }

        @keyframes modalFadeIn {
            from { opacity: 0; transform: translateY(-30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.5rem;
            border-bottom: 1px solid #eee;
        }

        .modal-header h3 {
            margin: 0;
            color: #333;
            font-size: 1.5rem;
        }

        .close-modal {
            font-size: 1.8rem;
            cursor: pointer;
            color: #666;
            transition: color 0.2s;
        }

        .close-modal:hover {
            color: #f44336;
        }

        .similar-products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            padding: 1.5rem;
            max-height: 70vh;
            overflow-y: auto;
        }

        .similar-product-card {
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            cursor: pointer;
        }

        .similar-product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }

        .similar-product-card .product-image {
            height: 180px;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }

        .similar-product-card .product-info {
            padding: 1rem;
        }

        .similar-product-card h4 {
            margin: 0 0 0.5rem;
            font-size: 1.1rem;
            color: #333;
        }

        .similar-product-card p {
            margin: 0 0 0.8rem;
            color: #666;
            font-size: 0.9rem;
        }

        .similar-product-card .product-price {
            font-weight: bold;
            color: #e53935;
            font-size: 1.2rem;
            margin-bottom: 1rem;
        }

        .btn-view-details {
            background: linear-gradient(135deg, #4CAF50, #2E7D32);
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: all 0.3s;
            width: 100%;
        }

        .btn-view-details:hover {
            background: linear-gradient(135deg, #43A047, #1B5E20);
            box-shadow: 0 2px 8px rgba(46, 125, 50, 0.3);
        }
        
        /* Footer */
        .footer {
            background: rgba(44, 62, 80, 0.95);
            backdrop-filter: blur(10px);
            color: white;
            text-align: center;
            padding: 40px 0;
            margin-top: 60px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .footer h3 {
            margin-bottom: 20px;
            color: #ecf0f1;
        }

        .footer-contact {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }

        .footer-contact-item {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .footer-contact-item i {
            color: #e74c3c;
            font-size: 1.2rem;
        }

        /* Rotating Banner */
        .rotating-banner {
            margin: 100px 0 40px;
            padding: 60px 0;
            position: relative;
        }

        .banner-container {
            position: relative;
            width: 980px;
            height: 600px;
            margin: 0 auto;
        }

        .central-bulldozer {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            z-index: 10;
        }

        .bulldozer-image {
            width: 675px;
            height: 400px;
            margin: 0 auto 20px;
            border-radius: 50%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
        }
        .bulldozer-image img {
            width: 100%;
            height: 100%;
        }

        .central-bulldozer h2 {
            font-size: 2rem;
            color: white;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }

        .central-bulldozer p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 1.1rem;
        }

        .rotating-cards {
            position: relative;
            width: 100%;
            height: 100%;
        }

        .card-orbit {
            position: absolute;
            width: 120px;
            height: 80px;
            top: 50%;
            left: 50%;
            transform-origin: 0 0;
        }

        .card-1 { transform: translate(180px, -90px)  translateX(250px); }
        .card-2 { transform: translate(160px, -50px) rotate(51.4deg) translateX(250px); }
        .card-3 { transform: translate(-220px, -70px) rotate(102.8deg) translateX(250px); }
        .card-4 { transform: translate(-180px, -140px) rotate(154.2deg) translateX(250px); }
        .card-5 { transform: translate(-70px, -100px) rotate(205.6deg) translateX(250px); }
        .card-6 { transform: translate(30px, -40px) rotate(257deg) translateX(250px); }
        .card-7 { transform: translate(100px, -70px) rotate(308.4deg) translateX(250px); }
        .card-8 { transform: translate(100px, 30px) rotate(102.8deg) translateX(250px); }

        /* 确保卡片内容始终朝上 */
        .card-1 .feature-card-mini { transform: rotate(0deg); }
        .card-2 .feature-card-mini { transform: rotate(-51.4deg); }
        .card-3 .feature-card-mini { transform: rotate(-102.8deg); }
        .card-4 .feature-card-mini { transform: rotate(-154.2deg); }
        .card-5 .feature-card-mini { transform: rotate(-205.6deg); }
        .card-6 .feature-card-mini { transform: rotate(-257deg); }
        .card-7 .feature-card-mini { transform: rotate(-308.4deg); }
        .card-8 .feature-card-mini { transform: rotate(-102.8deg); }

        .feature-card-mini {
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 15px;
            padding: 15px;
            text-align: center;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            width: 120px;
            height: 80px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            cursor: pointer;
        }

        .feature-card-mini i {
            font-size: 1.5rem;
            color: #e74c3c;
            margin-bottom: 8px;
        }

        .feature-card-mini span {
            font-size: 0.8rem;
            font-weight: 600;
            color: #fff;
            line-height: 1.2;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }

            .product-header {
                grid-template-columns: 1fr;
                gap: 20px;
                padding: 20px;
            }

            .product-title {
                font-size: 1.8rem;
            }

            .features-list {
                grid-template-columns: 1fr;
            }

            .product-actions {
                flex-direction: column;
            }

            .specs-grid {
                grid-template-columns: 1fr;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .banner-container {
                width: 400px;
                height: 400px;
            }

            .card-1 { transform: translate(-60px, -40px) rotate(0deg) translateX(170px); }
            .card-2 { transform: translate(-60px, -40px) rotate(51.4deg) translateX(170px); }
            .card-3 { transform: translate(-60px, -40px) rotate(102.8deg) translateX(170px); }
            .card-4 { transform: translate(-60px, -40px) rotate(154.2deg) translateX(170px); }
            .card-5 { transform: translate(-60px, -40px) rotate(205.6deg) translateX(170px); }
            .card-6 { transform: translate(-60px, -40px) rotate(257deg) translateX(170px); }
            .card-7 { transform: translate(-60px, -40px) rotate(308.4deg) translateX(170px); }

            .central-bulldozer h2 {
                font-size: 1.5rem;
            }
        }

        /* Feature Modules Styles */
        .feature-modules {
            padding: 60px 0;
            background: #f8f9fa;
        }

        .feature-module {
            margin-bottom: 80px;
            background: white;
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease;
        }

        .feature-module.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .feature-module h2 {
            text-align: center;
            margin-bottom: 40px;
            color: #2c3e50;
            font-size: 2.5rem;
            font-weight: 700;
        }

        /* Manual Module */
        .manual-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .manual-item {
            text-align: center;
            padding: 30px;
            border-radius: 15px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            transition: transform 0.3s ease;
        }

        .manual-item:hover {
            transform: translateY(-10px);
        }

        .manual-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 20px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .manual-icon i {
            font-size: 2rem;
        }

        .manual-item h3 {
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        /* Performance Module */
        .performance-charts {
            max-width: 600px;
            margin: 0 auto;
        }

        .chart-item {
            margin-bottom: 30px;
        }

        .chart-item h3 {
            margin-bottom: 10px;
            color: #2c3e50;
            font-size: 1.2rem;
        }

        .chart-bar {
            background: #ecf0f1;
            border-radius: 25px;
            height: 50px;
            position: relative;
            overflow: hidden;
        }

        .bar {
            height: 100%;
            background: linear-gradient(90deg, #3498db, #2ecc71);
            border-radius: 25px;
            display: flex;
            align-items: center;
            justify-content: flex-end;
            padding-right: 20px;
            color: white;
            font-weight: bold;
            transition: width 1s ease;
        }

        /* Service Module */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .service-item {
            text-align: center;
            padding: 30px;
            border-radius: 15px;
            background: white;
            border: 2px solid #e74c3c;
            transition: all 0.3s ease;
        }

        .service-item:hover {
            background: #e74c3c;
            color: white;
            transform: translateY(-5px);
        }

        .service-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 20px;
            background: #e74c3c;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            transition: all 0.3s ease;
        }

        .service-item:hover .service-icon {
            background: white;
            color: #e74c3c;
        }

        .service-icon i {
            font-size: 2rem;
        }

        .service-item h3 {
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        /* Testimonials */
        .testimonials {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .testimonial-item {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 15px;
            border-left: 5px solid #f39c12;
        }

        .testimonial-content p {
            font-style: italic;
            margin-bottom: 20px;
            font-size: 1.1rem;
            line-height: 1.6;
        }

        .testimonial-author strong {
            color: #2c3e50;
            display: block;
            margin-bottom: 5px;
        }

        .testimonial-author span {
            color: #7f8c8d;
            font-size: 0.9rem;
        }

        /* Gallery Module */
        .gallery-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }

        .gallery-item {
            position: relative;
            border-radius: 15px;
            overflow: hidden;
            aspect-ratio: 4/3;
        }

        .gallery-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .gallery-item:hover img {
            transform: scale(1.1);
        }

        .gallery-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
            color: white;
            padding: 20px;
            transform: translateY(100%);
            transition: transform 0.3s ease;
        }

        .gallery-item:hover .gallery-overlay {
            transform: translateY(0);
        }

        /* Video Module */
        .video-container {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
        }

        .video-container video {
            width: 100%;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

        /* Videos Grid - 多视频网格布局 */
        .videos-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .video-item {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }

        .video-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

        .video-wrapper {
            position: relative;
            width: 100%;
            padding-top: 56.25%; /* 16:9 宽高比 */
            background: #000;
            overflow: hidden;
        }

        .product-video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            border: none;
            outline: none;
        }

        .video-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.3s ease;
            pointer-events: none;
        }

        .video-item:hover .video-overlay {
            opacity: 1;
        }

        .video-overlay i {
            font-size: 4rem;
            color: rgba(255, 255, 255, 0.9);
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
        }

        .video-info {
            padding: 20px;
            text-align: center;
        }

        .video-info h4 {
            color: #2c3e50;
            font-size: 1.1rem;
            font-weight: 600;
            margin: 0;
        }

        .video-description {
            margin-top: 30px;
            text-align: center;
            padding: 30px;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: 15px;
        }

        .video-description h3 {
            color: #2c3e50;
            margin-bottom: 15px;
            font-size: 1.5rem;
        }

        .video-description p {
            color: #7f8c8d;
            line-height: 1.8;
            margin: 0;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .videos-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .video-overlay i {
                font-size: 3rem;
            }
        }

        /* Pricing Module */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .pricing-item {
            background: white;
            border: 2px solid #ecf0f1;
            border-radius: 20px;
            padding: 40px 30px;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .pricing-item:hover {
            border-color: #3498db;
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(52, 152, 219, 0.2);
        }

        .pricing-item h3 {
            color: #2c3e50;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }

        .price-value {
            font-size: 2.5rem;
            font-weight: bold;
            color: #3498db;
            margin-bottom: 30px;
        }

        .price-unit {
            font-size: 1rem;
            color: #7f8c8d;
        }

        .pricing-features {
            list-style: none;
            padding: 0;
        }

        .pricing-features li {
            padding: 10px 0;
            border-bottom: 1px solid #ecf0f1;
            color: #2c3e50;
        }

        .pricing-features li:last-child {
            border-bottom: none;
        }

        .pricing-features li:before {
            content: "✓";
            color: #27ae60;
            font-weight: bold;
            margin-right: 10px;
        }

        /* Download Section */
        .download-section {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 40px;
            margin: 40px 0;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .download-section h2 {
            color: #2c3e50;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 30px;
            text-align: center;
            position: relative;
            padding-bottom: 20px;
        }

        .download-section h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, #e74c3c, #f39c12);
            border-radius: 2px;
        }

        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }

        .download-item {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: 15px;
            padding: 25px;
            text-align: center;
            transition: all 0.3s ease;
            border: 2px solid transparent;
            position: relative;
            overflow: hidden;
        }

        .download-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #e74c3c, #c0392b);
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

        .download-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(231, 76, 60, 0.2);
            border-color: #e74c3c;
        }

        .download-item:hover::before {
            transform: scaleX(1);
        }

        .download-link {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            padding: 15px 30px;
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
            text-decoration: none;
            border-radius: 25px;
            font-weight: 600;
            font-size: 1rem;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
        }

        .download-link:hover {
            background: linear-gradient(135deg, #c0392b, #a93226);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(231, 76, 60, 0.4);
            color: white;
        }

        .download-link:active {
            transform: translateY(0);
        }

        .download-link i {
            font-size: 1.2rem;
        }

        .download-item-title {
            font-size: 1.1rem;
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        .download-item-desc {
            font-size: 0.9rem;
            color: #7f8c8d;
            margin-bottom: 15px;
        }

        .download-item-size {
            font-size: 0.85rem;
            color: #95a5a6;
            margin-top: 10px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .download-section {
                padding: 25px 20px;
            }

            .download-section h2 {
                font-size: 1.5rem;
            }

            .download-grid {
                grid-template-columns: 1fr;
            }

            .download-link {
                width: 100%;
                justify-content: center;
            }
        }

        /* 产品特性侧边导航栏 */
        .product-features-nav {
            position: fixed;
            top: 50%;
            left: 20px;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            z-index: 999;
            width: 280px;
            max-height: 80vh;
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .product-features-nav.collapsed {
            width: 60px;
        }

        .product-features-nav .nav-header {
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            color: white;
            padding: 15px 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: 14px;
            border-radius: 15px 15px 0 0;
        }

        .product-features-nav.collapsed .nav-header span {
            display: none;
        }

        .product-features-nav .nav-items {
            padding: 10px 0;
            max-height: calc(80vh - 120px);
            overflow-y: auto;
        }

        .product-features-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 20px;
            color: #333;
            text-decoration: none;
            transition: all 0.3s ease;
            border-left: 3px solid transparent;
            font-size: 14px;
        }

        .product-features-nav.collapsed .nav-item {
            justify-content: center;
            padding: 12px 0;
        }

        .product-features-nav.collapsed .nav-item span {
            display: none;
        }

        .product-features-nav .nav-item:hover {
            background: rgba(231, 76, 60, 0.1);
            border-left-color: #e74c3c;
            color: #e74c3c;
        }

        .product-features-nav .nav-item.active {
            background: rgba(231, 76, 60, 0.15);
            border-left-color: #e74c3c;
            color: #e74c3c;
            font-weight: 600;
        }

        .product-features-nav .nav-item i {
            width: 16px;
            text-align: center;
            font-size: 16px;
        }

        .product-features-nav .nav-toggle {
            position: absolute;
            top: 50%;
            right: -15px;
            transform: translateY(-50%);
            width: 30px;
            height: 30px;
            background: #e74c3c;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 2px 10px rgba(231, 76, 60, 0.3);
        }

        .product-features-nav .nav-toggle:hover {
            background: #c0392b;
            transform: translateY(-50%) scale(1.1);
        }

        .product-features-nav.collapsed .nav-toggle i {
            transform: rotate(180deg);
        }

        /* 响应式设计 */
        @media (max-width: 1200px) {
            .product-features-nav {
                right: 10px;
                width: 250px;
            }
        }

        @media (max-width: 768px) {
            .product-features-nav {
                display: none;
            }

            .feature-module {
                padding: 20px;
                margin-bottom: 40px;
            }

            .feature-module h2 {
                font-size: 2rem;
            }

            .manual-grid,
            .service-grid,
            .testimonials,
            .gallery-grid,
            .pricing-grid {
                grid-template-columns: 1fr;
            }

            .price-value {
                font-size: 2rem;
            }

            .back-to-top {
                bottom: 20px;
                right: 20px;
                width: 45px;
                height: 45px;
                font-size: 1.1rem;
            }
        }

        /* 滚动条样式 */
        .product-features-nav .nav-items::-webkit-scrollbar {
            width: 4px;
        }

        .product-features-nav .nav-items::-webkit-scrollbar-track {
            background: rgba(0, 0, 0, 0.1);
            border-radius: 2px;
        }

        .product-features-nav .nav-items::-webkit-scrollbar-thumb {
            background: #e74c3c;
            border-radius: 2px;
        }

        .product-features-nav .nav-items::-webkit-scrollbar-thumb:hover {
            background: #c0392b;
        }

        /* 图片放大功能样式 */
        .gallery-item {
            position: relative;
            cursor: pointer;
            overflow: hidden;
            border-radius: 10px;
            transition: transform 0.3s ease;
        }

        .gallery-item:hover {
            transform: scale(1.02);
        }

        .gallery-image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .gallery-overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .gallery-item:hover .gallery-overlay {
            opacity: 1;
        }

        .zoom-icon {
            margin-top: 10px;
            font-size: 1.5rem;
            color: white;
            background: rgba(231, 76, 60, 0.8);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }

        .zoom-icon:hover {
            background: rgba(231, 76, 60, 1);
            transform: scale(1.1);
        }

        /* 图片模态框样式 */
        .image-modal {
            display: none;
            position: fixed;
            z-index: 9999;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.9);
            backdrop-filter: blur(5px);
        }

        .modal-content {
            position: relative;
            margin: 70px auto 0;
            padding: 20px;
            width: 80%;
            height: 90%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
        }

        .close-modal {
            position: absolute;
            top: 20px;
            right: 35px;
            color: #fff;
            font-size: 40px;
            font-weight: bold;
            cursor: pointer;
            z-index: 10001;
            transition: color 0.3s ease;
        }

        .close-modal:hover {
            color: #e74c3c;
        }

        #modalImage {
            max-width: 100%;
            max-height: 80%;
            object-fit: contain;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
        }

        .modal-navigation {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 100%;
            display: flex;
            justify-content: space-between;
            padding: 0 20px;
            pointer-events: none;
        }

        .img-nav-btn {
            background: rgba(231, 76, 60, 0.8);
            color: white;
            border: none;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            cursor: pointer;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            pointer-events: auto;
        }

        .img-nav-btn:hover {
            background: rgba(231, 76, 60, 1);
            transform: scale(1.1);
        }

        .img-nav-btn:disabled {
            background: rgba(255, 255, 255, 0.3);
            cursor: not-allowed;
            transform: none;
        }

        .image-counter {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            color: white;
            background: rgba(0, 0, 0, 0.7);
            padding: 10px 20px;
            border-radius: 20px;
            font-size: 1rem;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .modal-content {
                padding: 10px;
            }

            .close-modal {
                top: 10px;
                right: 20px;
                font-size: 30px;
            }

            #modalImage {
                max-height: 70%;
            }

            .img-nav-btn {
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }

            .modal-navigation {
                padding: 0 10px;
            }

            .image-counter {
                bottom: 10px;
                font-size: 0.9rem;
                padding: 8px 16px;
            }
        }

        /* 产品优点模块样式 */
#product-advantages {
    margin: 60px 0;
    padding: 40px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
}

#product-advantages h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 50px;
    position: relative;
}

#product-advantages h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #ff6b35, #f7931e);
    border-radius: 2px;
}

.advantages-gallery {
    max-width: 1200px;
    margin: 0 auto;
}

.advantage-item {
    background: white;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.advantage-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.advantage-image {
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.advantage-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.advantage-item:hover .advantage-img {
    transform: scale(1.05);
}

.zoom-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.advantage-image:hover .zoom-overlay {
    opacity: 1;
}

.zoom-overlay i {
    color: white;
    font-size: 2rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.advantage-info {
    padding: 25px;
}

.advantage-info h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 15px;
    line-height: 1.3;
}

.advantage-info p {
    color: #6c757d;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* 图片放大模态框样式 */
.image-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    animation: fadeIn 0.3s ease;
}

.image-modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    animation: zoomIn 0.3s ease;
}

.modal-image {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.close-modal {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.5);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.close-modal:hover {
    background: rgba(255, 255, 255, 0.2);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes zoomIn {
    from { transform: scale(0.5); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .advantages-gallery {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 15px;
    }
    
    #product-advantages h2 {
        font-size: 2rem;
        margin-bottom: 30px;
    }
    
    .advantage-image {
        height: 200px;
    }
    
    .advantage-info {
        padding: 20px;
    }
    
    .advantage-info h3 {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    #product-advantages {
        margin: 30px 0;
        padding: 30px 0;
    }
    
    #product-advantages h2 {
        font-size: 1.8rem;
    }
    
    .advantage-image {
        height: 180px;
    }
    
    .modal-content {
        max-width: 95%;
        max-height: 95%;
    }
}