:root {
            --primary-blue: #0b2545;
            --accent-blue: #134074;
            --light-blue: #8da9c4;
            --dark-charcoal: #1d2d44;
            --pure-white: #ffffff;
            --border-color: #e2e8f0;
            --text-main: #334155;
            --alert-red: #d9383a;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--pure-white);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }
        .container {
            width: 100%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ========== 顶部信息条（与您的头部一致） ========== */
        .top-bar {
            background-color: var(--primary-blue);
            color: var(--pure-white);
            font-size: 14px;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .top-bar-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* ========== Header 导航（与您的头部一致） ========== */
        header {
            background: var(--pure-white);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
        }
        .header-flex {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            max-width: 100%;
            padding: 0 12%;
            margin: 0 auto;
            background: #fff;
        }
        .logo-area img {
            height: 55px;
            object-fit: contain;
        }
        nav ul {
            list-style: none;
            display: flex;
            gap: 20px;
        }
        nav ul li a {
            font-size: 16px;
            font-weight: 600;
            color: var(--dark-charcoal);
            padding: 8px 4px;
            letter-spacing: 0.5px;
        }
        nav ul li a:hover, nav ul li a.active {
            color: #3399ff;
            background-color: #e6f5ff;
            border-bottom: 6px solid #3399ff;
        }
        .menu-toggle {
            display: none;
            font-size: 28px;
            cursor: pointer;
            color: var(--dark-charcoal);
            padding: 8px;
            flex-shrink: 0;
        }

        /* ========== 页脚样式（与您的底部一致） ========== */
        footer {
            background-color: #2c2f38;
            color: #e2e8f0;
            padding: 50px 0 30px;
        }
        .footer-row {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 35px;
        }
        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            gap:14px;
            margin-bottom:22px;
        }
        .footer-contact-icon {
            width:50px;
            height:50px;
            border-radius:50%;
            background:#444750;
            display:flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
            font-size:24px;
        }
        .footer-col h5 {
            font-size:22px;
            margin-bottom:20px;
            font-weight:600;
            color:#fff;
        }
        .footer-col ul {
            list-style:none;
        }
        .footer-col ul li {
            margin-bottom:10px;
            font-size:16px;
        }
        .footer-col ul li a:hover {
            color:#8da9c4;
        }
        .footer-bottom-text {
            text-align:center;
            padding-top:25px;
            border-top:1px solid #444750;
            font-size:17px;
            color:#b0b8c4;
        }
        .footer-contact-text a{
            font-size:20px;
            font-weight:500;
            color:#fff;
        }

        /* ========== 以下为 xnair 产品内容页专属样式（xnair- 命名空间） ========== */
        .xnair-breadcrumb-wrap {
            background-color: #f8fafc;
            border-bottom: 1px solid var(--border-color);
            padding: 14px 0;
        }
        .xnair-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: #64748b;
            list-style: none;
        }
        .xnair-breadcrumb li {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .xnair-breadcrumb li a {
            color: var(--accent-blue);
            font-weight: 500;
        }
        .xnair-breadcrumb li a:hover {
            color: #3399ff;
            text-decoration: underline;
        }
        .xnair-breadcrumb li:last-child {
            color: var(--dark-charcoal);
            font-weight: 600;
        }
        .xnair-breadcrumb-sep {
            color: #cbd5e1;
            user-select: none;
        }

        .xnair-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 40px 60px;
        }

        /* Hero Section */
        .xnair-hero-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            margin-bottom: 40px;
        }
        .xnair-hero-img {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0,0,0,0.10);
            background: #f1f5f9;
        }
        .xnair-hero-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .xnair-hero-text h1 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .xnair-hero-subtitle {
            font-size: 1.05rem;
            color: #475569;
            margin-bottom: 20px;
            line-height: 1.7;
        }
        .xnair-hero-highlights {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 24px;
        }
        .xnair-hero-highlights span {
            display: inline-block;
            background: #eef4fb;
            color: var(--accent-blue);
            font-weight: 600;
            font-size: 0.9rem;
            padding: 8px 16px;
            border-radius: 20px;
            border: 1px solid #d0dff0;
            white-space: nowrap;
        }
        .xnair-cta-btn {
            display: inline-block;
            background: var(--alert-red);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            padding: 14px 32px;
            border-radius: 6px;
            letter-spacing: 0.5px;
            transition: background 0.25s ease, transform 0.2s ease;
            text-align: center;
        }
        .xnair-cta-btn:hover {
            background: #b72e30;
            transform: translateY(-2px);
            color: #fff;
        }

        /* TOC 目录模块 */
        .xnair-toc-wrap {
            background: #f8fafc;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px 24px;
            margin-bottom: 40px;
            position: sticky;
            top: 96px;
            z-index: 50;
        }
        .xnair-toc-title {
            font-weight: 700;
            font-size: 1rem;
            color: var(--primary-blue);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            user-select: none;
        }
        .xnair-toc-title .xnair-toc-arrow {
            transition: transform 0.3s ease;
            font-size: 0.8rem;
        }
        .xnair-toc-title.open .xnair-toc-arrow {
            transform: rotate(180deg);
        }
        .xnair-toc-list {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 10px 20px;
            transition: max-height 0.35s ease;
            overflow: hidden;
        }
        .xnair-toc-list li a {
            font-size: 0.9rem;
            color: var(--accent-blue);
            font-weight: 500;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
        }
        .xnair-toc-list li a:hover {
            color: #3399ff;
            border-bottom-color: #3399ff;
        }

        /* AI 摘要模块 */
        .xnair-summary-box {
            background: linear-gradient(135deg, #eef4fb 0%, #f8fafc 100%);
            border-left: 4px solid var(--accent-blue);
            border-radius: 0 8px 8px 0;
            padding: 24px 28px;
            margin-bottom: 40px;
        }
        .xnair-summary-box h2 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 10px;
        }
        .xnair-summary-box p {
            font-size: 1rem;
            color: #334155;
            line-height: 1.75;
        }

        /* 通用板块标题 */
        .xnair-section {
            margin-bottom: 48px;
        }
        .xnair-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 8px;
            padding-bottom: 12px;
            border-bottom: 3px solid #e2e8f0;
            position: relative;
        }
        .xnair-section h2::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--accent-blue);
            border-radius: 2px;
        }
        .xnair-section h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--dark-charcoal);
            margin: 24px 0 10px;
        }
        .xnair-section p {
            color: #475569;
            line-height: 1.8;
            margin-bottom: 14px;
        }

        /* 技术规格表 */
        .xnair-specs-table-wrap {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
        .xnair-specs-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
            margin: 20px 0;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0,0,0,0.05);
        }
        .xnair-specs-table thead th {
            background: var(--primary-blue);
            color: #fff;
            padding: 14px 18px;
            text-align: left;
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.4px;
        }
        .xnair-specs-table tbody td {
            padding: 13px 18px;
            border-bottom: 1px solid #e2e8f0;
            vertical-align: top;
        }
        .xnair-specs-table tbody tr:nth-child(even) {
            background: #f8fafc;
        }
        .xnair-specs-table tbody tr:hover {
            background: #eef4fb;
        }
        .xnair-spec-label {
            font-weight: 600;
            color: var(--dark-charcoal);
            white-space: nowrap;
            width: 38%;
        }

        /* 图文并排模块 */
        .xnair-media-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            margin: 30px 0;
        }
        .xnair-media-row.xnair-media-reverse {
            direction: rtl;
        }
        .xnair-media-row.xnair-media-reverse > * {
            direction: ltr;
        }
        .xnair-media-img {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 16px rgba(0,0,0,0.07);
            background: #f1f5f9;
        }
        .xnair-media-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .xnair-media-text h3 {
            margin-top: 0;
        }

        /* 工程细节列表 */
        .xnair-detail-list {
            list-style: none;
            padding: 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px 24px;
            margin: 16px 0;
        }
        .xnair-detail-list li {
            padding: 10px 0 10px 28px;
            position: relative;
            color: #334155;
            line-height: 1.6;
            border-bottom: 1px dotted #e2e8f0;
        }
        .xnair-detail-list li::before {
            content: '▸';
            position: absolute;
            left: 4px;
            top: 10px;
            color: var(--accent-blue);
            font-weight: 700;
            font-size: 0.85rem;
        }

        /* FAQ */
        .xnair-faq details {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            padding: 0;
            transition: box-shadow 0.2s ease;
        }
        .xnair-faq details[open] {
            box-shadow: 0 4px 16px rgba(0,0,0,0.06);
            border-color: #cbd5e1;
        }
        .xnair-faq summary {
            padding: 16px 20px;
            font-weight: 600;
            cursor: pointer;
            color: var(--dark-charcoal);
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            font-size: 1rem;
        }
        .xnair-faq summary::-webkit-details-marker {
            display: none;
        }
        .xnair-faq summary::after {
            content: '+';
            font-size: 1.3rem;
            font-weight: 400;
            color: var(--accent-blue);
        }
        .xnair-faq details[open] summary::after {
            content: '−';
        }
        .xnair-faq .xnair-faq-answer {
            padding: 0 20px 18px;
            color: #475569;
            line-height: 1.75;
            font-size: 0.95rem;
        }

        /* 质量认证 */
        .xnair-quality-box {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 28px 32px;
            margin: 24px 0;
        }
        .xnair-quality-box h3 {
            margin-top: 0;
            color: var(--primary-blue);
        }
        .xnair-quality-box ul {
            list-style: disc;
            padding-left: 22px;
            color: #334155;
            line-height: 1.9;
        }

        /* 上一篇/下一篇导航 */
        .xnair-pagination-nav {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-top: 50px;
            padding-top: 28px;
            border-top: 2px solid #e2e8f0;
            flex-wrap: wrap;
        }
        .xnair-pagination-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            color: var(--accent-blue);
            font-size: 0.95rem;
            padding: 10px 18px;
            border: 1px solid #d0dff0;
            border-radius: 6px;
            background: #fff;
            transition: all 0.25s ease;
        }
        .xnair-pagination-nav a:hover {
            background: #eef4fb;
            border-color: var(--accent-blue);
            color: var(--primary-blue);
        }
        .xnair-pagination-nav .xnair-prev::before {
            content: '← ';
        }
        .xnair-pagination-nav .xnair-next::after {
            content: ' →';
        }

        /* 相关产品 */
        .xnair-related-products {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 2px solid #e2e8f0;
        }
        .xnair-related-products h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 20px;
        }
        .xnair-related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 20px;
            list-style: none;
            padding: 0;
        }
        .xnair-related-grid li a {
            display: block;
            padding: 16px 18px;
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            font-weight: 600;
            color: var(--accent-blue);
            text-align: center;
            transition: all 0.25s ease;
        }
        .xnair-related-grid li a:hover {
            background: #eef4fb;
            border-color: var(--accent-blue);
            color: var(--primary-blue);
            transform: translateY(-3px);
            box-shadow: 0 6px 18px rgba(0,0,0,0.07);
        }

        /* ========== 响应式设计 ========== */
        @media(max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            /* 头部移动端 */
            .header-flex {
                position: relative;
                flex-wrap: wrap;
                flex-direction: row !important;
                justify-content: space-between;
                align-items: center;
            }
            .menu-toggle {
                display: block;
                order: 2;
            }
            .logo-area {
                order: 1;
            }
            header nav {
                width: 100%;
                position: absolute;
                left: 0;
                top: 100%;
                background: #fff;
                box-shadow: 0 8px 15px rgba(0,0,0,0.08);
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.35s ease;
                order: 3;
            }
            header nav.open {
                max-height: 600px;
            }
            nav ul {
                flex-direction: column;
                padding: 15px 20px;
                gap: 8px !important;
            }
            nav ul li a {
                display: block;
                padding: 10px 0;
                text-align: center;
            }
            .top-bar-flex {
                flex-direction: column;
                text-align: center;
                gap: 15px;
            }
            /* 产品内容移动端 */
            .xnair-main {
                padding: 24px 16px 40px;
            }
            .xnair-hero-wrap {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .xnair-hero-text h1 {
                font-size: 1.5rem;
            }
            .xnair-hero-highlights span {
                font-size: 0.8rem;
                padding: 6px 12px;
            }
            .xnair-toc-wrap {
                position: relative;
                top: auto;
                padding: 14px 16px;
            }
            .xnair-toc-list {
                max-height: 0;
                flex-direction: column;
                gap: 6px;
            }
            .xnair-toc-list.xnair-toc-open {
                max-height: 500px;
            }
            .xnair-toc-title {
                cursor: pointer;
            }
            .xnair-media-row, .xnair-media-row.xnair-media-reverse {
                grid-template-columns: 1fr;
                gap: 20px;
                direction: ltr;
            }
            .xnair-media-row.xnair-media-reverse > * {
                direction: ltr;
            }
            .xnair-specs-table {
                min-width: 600px;
                font-size: 0.85rem;
            }
            .xnair-specs-table thead th, .xnair-specs-table tbody td {
                padding: 10px 12px;
            }
            .xnair-detail-list {
                grid-template-columns: 1fr;
                gap: 6px 0;
            }
            .xnair-faq summary {
                font-size: 0.9rem;
                padding: 14px 16px;
            }
            .xnair-faq .xnair-faq-answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }
            .xnair-pagination-nav {
                flex-direction: column;
                gap: 10px;
            }
            .xnair-pagination-nav a {
                justify-content: center;
                font-size: 0.88rem;
                padding: 10px 14px;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .xnair-related-grid li a {
                font-size: 0.85rem;
                padding: 12px 10px;
            }
            .footer-row {
                grid-template-columns: 1fr;
            }
            .xnair-quality-box {
                padding: 18px 16px;
            }
        }
        @media(min-width: 769px) and (max-width: 1024px) {
            .xnair-hero-wrap {
                gap: 28px;
            }
            .xnair-hero-text h1 {
                font-size: 1.7rem;
            }
            .xnair-main {
                padding: 30px 24px 50px;
            }
            .xnair-detail-list {
                grid-template-columns: 1fr 1fr;
                gap: 8px 16px;
            }
            .footer-row {
                grid-template-columns: repeat(3, 1fr);
                gap: 25px;
            }
            .xnair-related-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        @media(min-width: 1441px) {
            .xnair-main {
                padding: 50px 0 70px;
            }
            .xnair-hero-text h1 {
                font-size: 2.3rem;
            }
            .xnair-hero-wrap {
                gap: 60px;
            }
        }