 <style>
        /* 全局重置与基础样式 - SEO友好：统一盒模型、字体，提升页面加载速度 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif; /* 适配中文显示，提升用户体验 */
        }

        /* 核心容器 - 语义化命名，提升SEO语义识别 */
        .container {
            max-width: 1300px;
            margin: 0 auto;
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            overflow: hidden;
        }

        /* 新增：导航菜单样式 - 语义化命名，适配整体风格与SEO */
        .nav-wrapper {
            background-color: #2c3e50;
            border-bottom: 2px solid #3498db;
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .main-nav {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        .nav-logo {
            color: #fff;
            font-size: 1.2rem;
            font-weight: 600;
            padding: 15px 0;
            text-decoration: none;
        }
        .nav-menu {
            display: flex;
            list-style: none;
        }
        .nav-item {
            position: relative;
        }
        .nav-link {
            color: #fff;
            text-decoration: none;
            padding: 15px 20px;
            display: block;
            font-size: 0.95rem;
            transition: all 0.2s ease;
        }
        .nav-link:hover {
            background-color: #3498db;
            color: #fff;
        }
        /* 下拉菜单样式 */
        .nav-dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            background-color: #fff;
            min-width: 200px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            border-radius: 4px;
            display: none;
            z-index: 999;
        }
        .dropdown-item {
            padding: 10px 15px;
            border-bottom: 1px solid #f0f5ff;
        }
        .dropdown-link {
            color: #2c3e50;
            text-decoration: none;
            font-size: 0.9rem;
            display: block;
            transition: all 0.2s ease;
        }
        .dropdown-link:hover {
            color: #3498db;
            padding-left: 20px;
        }
        .nav-item:hover .nav-dropdown {
            display: block;
        }
        /* 移动端导航触发按钮 */
        .nav-toggle {
            display: none;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 10px;
        }

        /* 头部样式 */
        header {
            background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
            color: white;
            padding: 25px 30px;
            text-align: center;
        }

        h1 {
            font-size: 2.2rem;
            margin-bottom: 8px;
            letter-spacing: 1px;
        }

        .subtitle {
            font-size: 1rem;
            opacity: 0.85;
            font-weight: 300;
        }

        /* 描述区域 */
        .description {
            padding: 20px 30px;
            background-color: #f0f5ff;
            border-bottom: 1px solid #e1e8f0;
            font-size: 0.95rem;
            color: #555;
        }

        .description p {
            margin-bottom: 8px;
        }

        /* 主体内容区 */
        .content {
            padding: 30px;
            font-size: 16px;
            line-height: 1.8;
        }

        /* 轴承专用容器（语义化命名，适配SEO） */
        .dscon-bearing-container {
            font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
            line-height: 1.8;
            color: #333;
            font-size: 16px;
            max-width: 100%;
            overflow-x: hidden;
            padding: 20px 30px;
        }

        /* 标题样式 - 语义化命名，提升SEO层级识别 */
        .dscon-h2 {
            font-size: 22px;
            color: #2c3e50;
            margin-top: 30px;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #3498db;
            font-weight: 600;
        }

        .dscon-h3 {
            font-size: 18px;
            color: #34495e;
            margin-top: 25px;
            margin-bottom: 10px;
            font-weight: 600;
        }

        /* 段落与强调样式 */
        .dscon-p {
            margin-bottom: 15px;
            text-align: justify; /* 两端对齐提升可读性，利于SEO用户体验 */
        }

        .dscon-strong {
            color: #c0392b;
            font-weight: 600;
        }

        /* 列表样式 - 语义化，提升内容结构化 */
        .dscon-ul {
            padding-left: 20px;
            margin-bottom: 20px;
        }
        .dscon-ul li {
            margin-bottom: 8px;
            list-style-type: disc;
        }
        .dscon-ol {
            padding-left: 25px;
            margin-bottom: 20px;
        }
        .dscon-ol li {
            margin-bottom: 10px;
            list-style-type: decimal;
        }

        /* 表格样式1：原生table */
        .product-table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            font-size: 15px;
            background-color: #fff;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            overflow-x: auto;
            display: block;
        }

        .product-table th {
            background-color: #2c3e50;
            color: white;
            padding: 12px 15px;
            text-align: left;
            font-weight: 500;
        }

        .product-table td {
            padding: 12px 15px;
            border-bottom: 1px solid #e1e8f0;
        }

        .product-table tr:nth-child(even) {
            background-color: #f8f9fa;
        }

        .product-table tr:hover {
            background-color: #f0f5ff;
            transition: background-color 0.2s ease;
        }

        /* 表格容器（适配滚动） */
        .table-container {
            overflow-x: auto;
            padding: 20px;
        }

        /* 表格样式2：DIV模拟表格（兼容场景） */
        .div-table {
            display: table;
            width: 100%;
            border-collapse: collapse;
            min-width: 900px;
        }

        .table-header {
            display: table-header-group;
            background-color: #2c3e50;
            color: white;
            font-weight: 600;
        }

        .table-row {
            display: table-row;
            transition: background-color 0.2s;
        }

        .table-row:nth-child(even) {
            background-color: #f8fafc;
        }

        .table-row:hover {
            background-color: #e8f4ff;
        }

        .table-cell {
            display: table-cell;
            padding: 15px 12px;
            border: 1px solid #e1e8f0;
            vertical-align: middle;
            text-align: center;
        }

        .table-header .table-cell {
            padding: 18px 12px;
            font-weight: 600;
            border-bottom: 2px solid #1a2530;
        }

        /* 表格列宽控制 */
        .col-part { width: 10%; }
        .col-diameter { width: 8%; }
        .col-rate { width: 12%; }
        .col-load { width: 10%; }
        .col-diameter2 { width: 12%; }
        .col-a { width: 8%; }
        .col-c { width: 8%; }
        .col-d { width: 8%; }

        /* 表格样式3：技术参数表（响应式） */
        .table-responsive {
            overflow-x: auto;
            margin: 20px 0;
            border-radius: 4px;
        }
        .tech-table {
            width: 100%;
            border-collapse: collapse;
            background-color: #fff;
            min-width: 600px;
        }
        .tech-table-full {
            width: 100%;
            border-collapse: collapse;
            background-color: #fff;
            min-width: 900px;
        }
        .tech-table th, .tech-table td,
        .tech-table-full th, .tech-table-full td {
            border: 1px solid #e0e0e0;
            padding: 12px 15px;
            text-align: left;
            font-size: 14px;
        }
        .tech-table th, .tech-table-full th {
            background-color: #f8f9fa;
            font-weight: 600;
            color: #333;
        }
        .tech-table tr:nth-child(even),
        .tech-table-full tr:nth-child(even) {
            background-color: #fcfcfc;
        }

        /* 系列高亮样式（语义化，提升内容区分度） */
        .series-fd { border-left: 4px solid #3498db; }
        .series-gd { border-left: 4px solid #2ecc71; }
        .series-hd { border-left: 4px solid #e74c3c; }
        .series-id { border-left: 4px solid #f39c12; }
        .series-jd { border-left: 4px solid #9b59b6; }
        .series-ad { border-left: 4px solid #1abc9c; }
        .series-bd { border-left: 4px solid #d35400; }
        .series-cd { border-left: 4px solid #c0392b; }
        .series-dd { border-left: 4px solid #16a085; }
        .series-ed { border-left: 4px solid #8e44ad; }

        /* 数据样式（语义化，提升内容识别） */
        .part-number {
            font-weight: 700;
            color: #2c3e50;
        }
        .diameter {
            font-weight: 600;
            color: #2c3e50;
        }
        .rate {
            color: #e74c3c;
            font-weight: 600;
        }
        .load {
            color: #27ae60;
            font-weight: 600;
        }
        .dimension {
            color: #2980b9;
            font-weight: 600;
        }

        /* 图例样式 */
        .legend {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            padding: 15px 30px;
            background-color: #f8fafc;
            border-top: 1px solid #e1e8f0;
            font-size: 0.85rem;
        }
        .legend-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 3px;
        }

        /* 链接样式 - SEO友好：语义化命名，优化交互 */
        .seo-keyword {
            text-decoration: none;
            color: inherit;
        }
        .internal-link {
            color: #3498db;
            text-decoration: none;
            border-bottom: 1px dotted #3498db;
        }
        .internal-link:hover {
            color: #e74c3c;
            border-bottom: 1px solid #e74c3c;
        }

        /* 型号链接样式（提升内链权重，适配SEO） */
        .model-links {
            margin: 30px 0;
            display: flex;
            flex-wrap: wrap;
            gap: 10px 15px;
            padding: 15px;
            background-color: #f8f9fa;
            border-radius: 6px;
            border: 1px solid #e1e8f0;
        }
        .model-links a {
            color: #3498db;
            text-decoration: none;
            font-weight: 600;
            padding: 6px 10px;
            border-radius: 4px;
            transition: all 0.2s ease;
        }
        .model-links a:hover {
            color: #fff;
            background-color: #3498db;
            text-decoration: none;
        }
        .model-links a.current-model {
            background-color: #e74c3c;
            color: #fff;
        }
        .model-links a.current-model:hover {
            background-color: #c0392b;
        }

        /* 页脚样式 */
        footer {
            text-align: center;
            padding: 20px;
            color: #7f8c8d;
            font-size: 0.9rem;
            border-top: 1px solid #e1e8f0;
        }

        /* 新增：案例展示样式 */
        .case-item {
            background-color: #f8f9fa;
            padding: 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            border-left: 4px solid #3498db;
        }
        .case-title {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        /* 新增：FAQ样式优化 */
        .faq-item {
            margin-bottom: 15px;
        }
        .faq-question {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 5px;
        }

        /* 响应式适配 - 提升移动端体验，符合百度移动优先索引规则 */
        @media (max-width: 768px) {
            /* 导航菜单响应式 */
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: #2c3e50;
                flex-direction: column;
                display: none;
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-link {
                padding: 12px 20px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .nav-dropdown {
                position: static;
                background-color: #34495e;
                box-shadow: none;
                border-radius: 0;
            }
            .dropdown-link {
                color: #fff;
            }
            .dropdown-item {
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }

            .container {
                border-radius: 8px;
            }
            h1 {
                font-size: 1.8rem;
            }
            .description {
                padding: 15px 20px;
            }
            .content {
                padding: 20px;
                font-size: 15px;
            }
            .dscon-h2 {
                font-size: 20px;
            }
            .dscon-bearing-container {
                font-size: 15px;
                padding: 0 10px;
            }
            /* 表格适配 */
            .product-table {
                font-size: 14px;
            }
            .product-table th, .product-table td {
                padding: 10px 12px;
            }
            .table-container {
                padding: 10px;
            }
            .table-cell {
                padding: 12px 8px;
                font-size: 0.9rem;
            }
            .table-header .table-cell {
                padding: 14px 8px;
                font-size: 0.9rem;
            }
            .tech-table th, .tech-table td,
            .tech-table-full th, .tech-table-full td {
                padding: 10px;
                font-size: 13px;
            }
            .model-links {
                gap: 8px 12px;
                font-size: 14px;
            }
        }

        @media (max-width: 480px) {
            header {
                padding: 20px 15px;
            }
            h1 {
                font-size: 1.5rem;
            }
            .description {
                padding: 12px 15px;
                font-size: 0.9rem;
            }
            .content {
                padding: 15px;
            }
            .legend {
                padding: 12px 15px;
                justify-content: center;
            }
            /* 表格适配小屏 */
            .product-table th, .product-table td {
                padding: 8px 10px;
            }
        }
    </style>