.product-detail-section {
            padding: 40px 0;
        }
        .product-main {
            display: grid;
            grid-template-columns: 3fr 2fr;
            gap: 40px;
            margin-bottom: 60px;
        }
        /* 左信息 右主图 */
        .product-info-section { grid-column: 1; }
        .product-image-section { grid-column: 2; }
        .product-image-section {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .product-main-image {
            width: 100%;
            height: 500px;
            background: #fff;
            border-radius: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            padding: 20px;
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.12);
        }
        .product-thumbnails {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 12px;
        }
        .product-thumbnail {
            width: 100%;
            height: 100px;
            background: #f3f4f6;
            border-radius: 4px;
            cursor: pointer;
            border: 2px solid transparent;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .product-thumbnail:hover {
            border-color: #d1d5db;
        }
        .product-thumbnail.active {
            border-color: #295b9e;
            border-width: 2px;
        }
        .product-info-section h1 {
            font-size: 32px;
            color: #1f2937;
            margin-bottom: 16px;
        }
        .product-model {
            font-size: 18px;
            color: #666;
            margin-bottom: 12px;
        }
        .product-id {
            font-size: 14px;
            color: #999;
            margin-bottom: 8px;
        }
        .product-specs { margin: 30px 0; }
        .product-specs h3 img { height: 24px; width: auto;}
        /* 规格下方的双列：左侧(下载+链接)，右侧(操作按钮) */
        .info-bottom-grid {
            display: grid;
            grid-template-columns: 1.6fr 0.8fr 0.6fr;
            gap: 24px;
            margin-top: 20px;
            border-top: 1px solid #e5e7eb;
        }
        .info-left-stack > * { margin-bottom: 20px; }
        @media (max-width: 992px) {
            .product-main { grid-template-columns: 1fr; }
            .product-info-section { grid-column: auto; }
            .product-image-section { grid-column: auto; }
            .info-bottom-grid { grid-template-columns: 1fr; }
        }
        .spec-item {
            display: flex;
            padding: 12px 0;
        }
        .spec-label {
            width: 200px;
            color: #666;
            font-size: 14px;
        }
        .spec-value {
            flex: 1;
            color: #1f2937;
            font-size: 14px;
        }
        .product-actions {
            margin: 30px 0;
        }
        .action-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            margin-right: 12px;
            margin-bottom: 12px;
            background: #295b9e;
            color: #fff;
            border-radius: 4px;
            border: none;
            cursor: pointer;
            font-size: 14px;
        }
        .action-btn:hover {
            background: #1d4ed8;
        }
        .action-btn.secondary {
            background: #fff;
            color: #295b9e;
            border: 1px solid #295b9e;
        }
        .action-btn.secondary:hover {
            background: #295b9e;
            color: #fff;
        }
        .download-section, .links-section {
            margin: 30px 0;
        }
        .download-link {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 0;
            color: #295b9e;
            font-size: 14px;
        }
        .download-link:hover {
            text-decoration: underline;
        }
        .tech-params {
            padding: 40px;
            border-radius: 8px;
            margin: 40px 0;
        }
        .tech-params h3 img { height: 24px; width: auto;}
        .tech-params h3 {
            font-size: 24px;
            color: #1f2937;
            margin-bottom: 30px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .params-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .param-column {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .param-row {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            border-bottom: 1px solid #e5e7eb;
        }
        .param-label {
            color: #666;
            font-size: 14px;
        }
        .param-value {
            color: #1f2937;
            font-size: 14px;
            font-weight: 500;
        }
        .prev-next {
            display: flex;
            justify-content: space-between;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid #e5e7eb;
        }
        .prev-next a {
            color: #666;
            font-size: 14px;
        }
        .prev-next a:hover {
            color: #295b9e;
        }
        
        @media (max-width: 768px) {
            .product-detail-section {
                padding: 30px 20px;
            }
            
            .product-main {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            
            .product-main-image {
                height: 300px;
            }
            
            .product-thumbnails {
                grid-template-columns: repeat(5, 1fr);
                gap: 10px;
            }
            
            .product-thumbnail {
                height: 80px;
            }
            
            .product-info-section h1 {
                font-size: 28px;
            }
            
            .product-model {
                font-size: 16px;
            }
            
            .info-bottom-grid {
                grid-template-columns: 1fr;
            }
            
            .params-grid {
                grid-template-columns: 1fr;
            }
        }