: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;
        }
        .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 {
            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;
        }
        @media(max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .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;
            }
        }
        /* ========== xnair产品页专属CSS变量（与头部底部隔离，使用xnair-命名空间） ========== */
        :root {
            --xnair-deep-navy: #0b2545;
            --xnair-steel-blue: #134074;
            --xnair-sky-mist: #8da9c4;
            --xnair-charcoal: #1d2d44;
            --xnair-pure-white: #ffffff;
            --xnair-border: #e2e8f0;
            --xnair-text: #334155;
            --xnair-accent-warm: #e6761a;
            --xnair-success-green: #2d8a56;
            --xnair-alert-red: #d9383a;
            --xnair-bg-light: #f8fafc;
            --xnair-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --xnair-shadow-md: 0 6px 24px rgba(0, 0, 0, 0.10);
            --xnair-radius: 8px;
            --xnair-transition: 0.3s ease;
        }

        /* ========== 面包屑导航样式 ========== */
        .xnair-breadcrumb-wrap {
            background: var(--xnair-bg-light);
            border-bottom: 1px solid var(--xnair-border);
            padding: 14px 0;
        }
        .xnair-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: #64748b;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .xnair-breadcrumb li {
            display: inline-flex;
            align-items: center;
        }
        .xnair-breadcrumb li+li::before {
            content: "›";
            margin-right: 8px;
            color: #94a3b8;
            font-weight: 700;
        }
        .xnair-breadcrumb a {
            color: var(--xnair-steel-blue);
            font-weight: 500;
        }
        .xnair-breadcrumb a:hover {
            color: var(--xnair-accent-warm);
            text-decoration: underline;
        }
        .xnair-breadcrumb .xnair-breadcrumb-current {
            color: var(--xnair-deep-navy);
            font-weight: 600;
        }

        /* ========== xnair产品页通用容器 ========== */
        .xnair-content-wrap {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ========== Hero区域 ========== */
        .xnair-hero-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            padding: 48px 0 40px;
        }
        .xnair-hero-text h1 {
            font-size: clamp(24px, 3.2vw, 34px);
            font-weight: 700;
            color: var(--xnair-deep-navy);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .xnair-hero-text .xnair-hero-subtitle {
            font-size: 17px;
            color: #475569;
            margin-bottom: 24px;
            line-height: 1.7;
        }
        .xnair-hero-highlights {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 24px;
        }
        .xnair-hero-highlight-tag {
            display: inline-block;
            background: #eef4fb;
            color: var(--xnair-steel-blue);
            font-size: 14px;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }
        .xnair-hero-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--xnair-accent-warm);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            padding: 14px 32px;
            border-radius: 6px;
            transition: background var(--xnair-transition), transform var(--xnair-transition);
            letter-spacing: 0.5px;
        }
        .xnair-hero-cta:hover {
            background: #c95e0f;
            transform: translateY(-2px);
        }
        .xnair-hero-image {
            position: relative;
        }
        .xnair-hero-image img {
            border-radius: var(--xnair-radius);
            box-shadow: var(--xnair-shadow-md);
            width: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
        }

        /* ========== AI Overview摘要模块 ========== */
        .xnair-overview-box {
            background: linear-gradient(135deg, #f0f6fc 0%, #e8f0f8 100%);
            border-left: 5px solid var(--xnair-steel-blue);
            border-radius: var(--xnair-radius);
            padding: 28px 32px;
            margin-bottom: 40px;
        }
        .xnair-overview-box h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 10px;
            letter-spacing: -0.2px;
        }
        .xnair-overview-box p {
            font-size: 16px;
            color: #3b4a5c;
            line-height: 1.8;
            max-width: 900px;
        }

        /* ========== 响应式TOC悬浮目录（上下排列，sticky定位） ========== */
        .xnair-toc-sticky {
            position: sticky;
            top: 100px;
            background: #fff;
            border: 1px solid var(--xnair-border);
            border-radius: var(--xnair-radius);
            padding: 24px 20px;
            box-shadow: var(--xnair-shadow-sm);
            z-index: 50;
            margin-bottom: 32px;
        }
        .xnair-toc-sticky h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 14px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .xnair-toc-sticky ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .xnair-toc-sticky ul li a {
            display: block;
            font-size: 14px;
            color: var(--xnair-steel-blue);
            font-weight: 500;
            padding: 6px 10px;
            border-radius: 4px;
            transition: background var(--xnair-transition), color var(--xnair-transition);
        }
        .xnair-toc-sticky ul li a:hover {
            background: #eef4fb;
            color: var(--xnair-deep-navy);
        }

        /* ========== 主内容两栏布局（桌面端：TOC侧边 + 内容主区） ========== */
        .xnair-main-layout {
            display: grid;
            grid-template-columns: 260px 1fr;
            gap: 40px;
            align-items: start;
        }
        .xnair-toc-col {
            position: relative;
        }
        .xnair-content-col {
            min-width: 0;
        }

        /* ========== 技术规格表样式 ========== */
        .xnair-specs-section h2,
        .xnair-global-section h2,
        .xnair-engineering-section h2,
        .xnair-faq-section h2,
        .xnair-quality-section h2,
        .xnair-related-section h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--xnair-steel-blue);
            display: inline-block;
            letter-spacing: -0.2px;
        }
        .xnair-specs-table-wrap {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            border-radius: var(--xnair-radius);
            box-shadow: var(--xnair-shadow-sm);
            border: 1px solid var(--xnair-border);
            margin-bottom: 12px;
        }
        .xnair-specs-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 15px;
            min-width: 600px;
        }
        .xnair-specs-table thead th {
            background: var(--xnair-deep-navy);
            color: #fff;
            font-weight: 600;
            padding: 14px 16px;
            text-align: left;
            letter-spacing: 0.4px;
            font-size: 14px;
            white-space: nowrap;
        }
        .xnair-specs-table tbody td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--xnair-border);
            vertical-align: top;
            color: var(--xnair-text);
        }
        .xnair-specs-table tbody tr:nth-child(even) {
            background: #fafcfd;
        }
        .xnair-specs-table tbody tr:hover {
            background: #eef4fb;
        }
        .xnair-specs-table .xnair-spec-param {
            font-weight: 700;
            color: var(--xnair-deep-navy);
            white-space: nowrap;
            width: 220px;
        }
        .xnair-specs-table .xnair-spec-note {
            font-size: 13px;
            color: #64748b;
            margin-top: 4px;
            font-style: italic;
        }

        /* ========== 应用场景卡片（带图片） ========== */
        .xnair-app-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin: 28px 0;
        }
        .xnair-app-card {
            background: #fff;
            border: 1px solid var(--xnair-border);
            border-radius: var(--xnair-radius);
            overflow: hidden;
            box-shadow: var(--xnair-shadow-sm);
            transition: box-shadow var(--xnair-transition), transform var(--xnair-transition);
        }
        .xnair-app-card:hover {
            box-shadow: var(--xnair-shadow-md);
            transform: translateY(-3px);
        }
        .xnair-app-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .xnair-app-card-body {
            padding: 18px 16px;
        }
        .xnair-app-card-body h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 6px;
        }
        .xnair-app-card-body p {
            font-size: 14px;
            color: #475569;
            line-height: 1.6;
        }

        /* ========== 全球适应性子区块 ========== */
        .xnair-global-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            margin: 24px 0;
        }
        .xnair-global-card {
            background: #fff;
            border: 1px solid var(--xnair-border);
            border-radius: var(--xnair-radius);
            padding: 24px 20px;
            box-shadow: var(--xnair-shadow-sm);
        }
        .xnair-global-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 10px;
        }
        .xnair-global-card p {
            font-size: 14px;
            color: #475569;
            line-height: 1.7;
        }

        /* ========== 工程细节列表 ========== */
        .xnair-eng-list {
            list-style: none;
            padding: 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 16px;
            margin: 20px 0;
        }
        .xnair-eng-list li {
            background: #f8fafc;
            border-radius: var(--xnair-radius);
            padding: 16px 18px;
            font-size: 15px;
            color: var(--xnair-text);
            border-left: 4px solid var(--xnair-steel-blue);
            line-height: 1.6;
        }
        .xnair-eng-list li strong {
            color: var(--xnair-deep-navy);
            display: block;
            margin-bottom: 4px;
        }

        /* ========== FAQ手风琴样式（纯CSS实现） ========== */
        .xnair-faq-item {
            border: 1px solid var(--xnair-border);
            border-radius: var(--xnair-radius);
            margin-bottom: 12px;
            overflow: hidden;
            background: #fff;
        }
        .xnair-faq-question {
            display: block;
            padding: 18px 20px;
            font-weight: 700;
            font-size: 16px;
            color: var(--xnair-deep-navy);
            cursor: pointer;
            background: #fafcfd;
            transition: background var(--xnair-transition);
            position: relative;
            padding-right: 48px;
            user-select: none;
        }
        .xnair-faq-question::after {
            content: "+";
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 22px;
            font-weight: 700;
            color: var(--xnair-steel-blue);
            transition: transform var(--xnair-transition);
        }
        .xnair-faq-item input[type="checkbox"] {
            display: none;
        }
        .xnair-faq-item input[type="checkbox"]:checked~.xnair-faq-question::after {
            content: "−";
            transform: translateY(-50%) rotate(180deg);
        }
        .xnair-faq-item input[type="checkbox"]:checked~.xnair-faq-question {
            background: #eef4fb;
        }
        .xnair-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.45s ease, padding 0.35s ease;
            padding: 0 20px;
            font-size: 15px;
            color: #475569;
            line-height: 1.7;
        }
        .xnair-faq-item input[type="checkbox"]:checked~.xnair-faq-answer {
            max-height: 600px;
            padding: 16px 20px 20px;
        }

        /* ========== 品质与认证模块 ========== */
        .xnair-quality-box {
            background: #f9fafb;
            border: 2px solid var(--xnair-border);
            border-radius: var(--xnair-radius);
            padding: 28px 24px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            align-items: center;
            margin: 24px 0;
        }
        .xnair-quality-box img {
            border-radius: var(--xnair-radius);
            width: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
        }
        .xnair-quality-text h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 12px;
        }
        .xnair-quality-text p {
            font-size: 15px;
            color: #475569;
            line-height: 1.7;
            margin-bottom: 8px;
        }
        .xnair-cert-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 12px;
        }
        .xnair-cert-badge {
            display: inline-block;
            background: var(--xnair-deep-navy);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 4px;
            letter-spacing: 0.5px;
        }

        /* ========== 分页导航（Previous/Next Article） ========== */
        .xnair-pagination-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            padding: 28px 0;
            border-top: 1px solid var(--xnair-border);
            border-bottom: 1px solid var(--xnair-border);
            margin: 36px 0;
            flex-wrap: wrap;
        }
        .xnair-pagination-row a {
            font-weight: 600;
            font-size: 15px;
            color: var(--xnair-steel-blue);
            padding: 10px 20px;
            border: 1px solid var(--xnair-border);
            border-radius: 6px;
            transition: all var(--xnair-transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .xnair-pagination-row a:hover {
            background: var(--xnair-deep-navy);
            color: #fff;
            border-color: var(--xnair-deep-navy);
        }

        /* ========== 相关产品推荐卡片 ========== */
        .xnair-related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin: 20px 0;
        }
        .xnair-related-card {
            border: 1px solid var(--xnair-border);
            border-radius: var(--xnair-radius);
            overflow: hidden;
            background: #fff;
            box-shadow: var(--xnair-shadow-sm);
            transition: box-shadow var(--xnair-transition);
        }
        .xnair-related-card:hover {
            box-shadow: var(--xnair-shadow-md);
        }
        .xnair-related-card img {
            width: 100%;
            height: 160px;
            object-fit: cover;
        }
        .xnair-related-card-body {
            padding: 14px;
        }
        .xnair-related-card-body h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--xnair-deep-navy);
            margin-bottom: 4px;
        }
        .xnair-related-card-body p {
            font-size: 13px;
            color: #64748b;
        }

        /* ========== 响应式断点 ========== */
        @media(max-width: 1024px) {
            .xnair-main-layout {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .xnair-toc-col {
                order: -1;
            }
            .xnair-toc-sticky {
                position: static;
                top: auto;
                display: flex;
                flex-wrap: wrap;
                align-items: center;
                gap: 10px;
                padding: 14px 16px;
            }
            .xnair-toc-sticky h3 {
                margin-bottom: 0;
                font-size: 14px;
                white-space: nowrap;
            }
            .xnair-toc-sticky ul {
                flex-direction: row;
                flex-wrap: wrap;
                gap: 6px;
            }
            .xnair-toc-sticky ul li a {
                font-size: 13px;
                padding: 4px 8px;
                white-space: nowrap;
            }
            .xnair-hero-section {
                grid-template-columns: 1fr;
                gap: 28px;
                padding: 32px 0 28px;
            }
            .xnair-quality-box {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        @media(max-width: 768px) {
            .xnair-content-wrap {
                padding: 0 20px;
            }
            .xnair-hero-highlights {
                gap: 8px;
            }
            .xnair-hero-highlight-tag {
                font-size: 12px;
                padding: 6px 12px;
            }
            .xnair-hero-cta {
                font-size: 14px;
                padding: 12px 24px;
            }
            .xnair-specs-table {
                font-size: 13px;
                min-width: 480px;
            }
            .xnair-specs-table thead th,
            .xnair-specs-table tbody td {
                padding: 8px 10px;
            }
            .xnair-specs-table .xnair-spec-param {
                width: 150px;
                font-size: 13px;
            }
            .xnair-app-grid,
            .xnair-global-grid,
            .xnair-related-grid {
                grid-template-columns: 1fr;
            }
            .xnair-pagination-row {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
            }
            .xnair-pagination-row a {
                justify-content: center;
            }
            .xnair-cert-badges {
                gap: 6px;
            }
            .xnair-cert-badge {
                font-size: 11px;
                padding: 4px 10px;
            }
            .xnair-toc-sticky ul {
                flex-direction: column;
                gap: 4px;
            }
        }
        @media(max-width: 480px) {
            .xnair-hero-text h1 {
                font-size: 22px;
            }
            .xnair-overview-box {
                padding: 18px 16px;
            }
            .xnair-overview-box h2 {
                font-size: 17px;
            }
            .xnair-overview-box p {
                font-size: 14px;
            }
            .xnair-specs-section h2,
            .xnair-global-section h2,
            .xnair-engineering-section h2,
            .xnair-faq-section h2,
            .xnair-quality-section h2,
            .xnair-related-section h2 {
                font-size: 21px;
            }
        }
        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;
        }
        @media(max-width: 1200px) {
            .footer-row {
                grid-template-columns: repeat(3, 1fr);
                gap: 25px;
            }
        }
        @media(max-width: 768px) {
            .footer-row {
                grid-template-columns: 1fr;
            }
        }