/* ========== 全站共用变量（原有，保留不动） ========== */
        :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;
            /* ====== 内容页新增变量 ====== */
            --xnair-accent: #0b2545;
            --xnair-table-stripe: #f8fafc;
            --xnair-toc-bg: #f1f5f9;
            --xnair-card-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            --xnair-highlight: #e8f4fd;
            --xnair-border-light: #e9ecef;
        }

        /* ========== 全局基础重置（原有，保留不动） ========== */
        * {
            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;
        }

        /* ========== 全局容器（原有，保留不动） ========== */
        .container {
            width: 100%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ========== 顶部信息条 top-bar 样式（原有，保留不动） ========== */
        .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 PC端基础样式（原有，保留不动） ========== */
        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;
        }

        /* ========== 汉堡菜单基础样式（原有，保留不动） ========== */
        .menu-toggle {
            display: none;
            font-size: 28px;
            cursor: pointer;
            color: var(--dark-charcoal);
            padding: 8px;
            flex-shrink: 0;
        }

        /* ========== 移动端768px适配（原有，保留不动） ========== */
        @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;
            }
        }

        /* ========== footer底部样式（原有，保留不动） ========== */
        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;
            }
        }

        /* ================================================================== */
        /* ========== 以下为【内容页新增样式 - xnair命名空间】全部注释标明 ========== */
        /* ================================================================== */

        /* ====== 面包屑导航样式 .xnair-breadcrumb ====== */
        .xnair-breadcrumb-wrap {
            background: #fafbfc;
            border-bottom: 1px solid var(--xnair-border-light);
            padding: 14px 0;
        }
        .xnair-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: #64748b;
            list-style: none;
        }
        .xnair-breadcrumb li {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .xnair-breadcrumb li a {
            color: #475569;
            transition: color 0.2s;
        }
        .xnair-breadcrumb li a:hover {
            color: #3399ff;
            text-decoration: underline;
        }
        .xnair-breadcrumb-sep {
            color: #cbd5e1;
            font-size: 11px;
            user-select: none;
        }
        .xnair-breadcrumb .xnair-breadcrumb-current {
            color: var(--xnair-accent);
            font-weight: 600;
            pointer-events: none;
        }

        /* ====== 产品页主内容区域 .xnair-product-main ====== */
        .xnair-product-main {
            padding: 40px 0 60px;
        }
        .xnair-product-main .container {
            max-width: 1320px;
        }

        /* ====== 两栏布局包装器 .xnair-content-layout ====== */
        .xnair-content-layout {
            display: grid;
            grid-template-columns: 260px 1fr;
            gap: 48px;
            align-items: start;
        }

        /* ====== TOC悬浮侧边栏 .xnair-toc-sidebar ====== */
        .xnair-toc-sidebar {
            position: sticky;
            top: 100px;
            background: var(--xnair-toc-bg);
            border: 1px solid var(--xnair-border-light);
            border-radius: 8px;
            padding: 22px 18px;
            z-index: 10;
        }
        .xnair-toc-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--xnair-accent);
            margin-bottom: 14px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        /* 目录项强制上下排列（垂直列表） */
        .xnair-toc-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .xnair-toc-list li {
            border-left: 3px solid transparent;
            padding-left: 12px;
            transition: all 0.2s;
        }
        .xnair-toc-list li:hover {
            border-left-color: #3399ff;
            background: rgba(51, 153, 255, 0.04);
        }
        .xnair-toc-list li a {
            display: block;
            font-size: 14px;
            color: #475569;
            line-height: 1.5;
            padding: 4px 0;
            transition: color 0.2s;
        }
        .xnair-toc-list li a:hover {
            color: #3399ff;
        }
        /* 移动端TOC折叠按钮 */
        .xnair-toc-toggle-btn {
            display: none;
            width: 100%;
            background: var(--xnair-toc-bg);
            border: 1px solid var(--xnair-border-light);
            border-radius: 6px;
            padding: 12px 16px;
            font-size: 15px;
            font-weight: 600;
            color: var(--xnair-accent);
            cursor: pointer;
            text-align: left;
            margin-bottom: 20px;
            position: relative;
        }
        .xnair-toc-toggle-btn::after {
            content: '▾';
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            transition: transform 0.3s;
        }
        .xnair-toc-toggle-btn.xnair-toc-open::after {
            transform: translateY(-50%) rotate(180deg);
        }
        .xnair-toc-collapsible {
            overflow: hidden;
            transition: max-height 0.4s ease;
        }

        /* ====== Hero区域 .xnair-hero-wrap ====== */
        .xnair-hero-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            margin-bottom: 36px;
        }
        .xnair-hero-text h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--xnair-accent);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: 0.2px;
        }
        .xnair-hero-text .xnair-hero-summary {
            font-size: 15px;
            color: #555;
            line-height: 1.7;
            margin-bottom: 18px;
        }
        .xnair-hero-highlights {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .xnair-hero-highlight-tag {
            display: inline-block;
            background: var(--xnair-highlight);
            color: var(--xnair-accent);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            border: 1px solid #d0e3f7;
            letter-spacing: 0.2px;
        }
        .xnair-hero-image img {
            border-radius: 8px;
            box-shadow: var(--xnair-card-shadow);
            width: 100%;
            object-fit: cover;
            aspect-ratio: 4/3;
            background: #eef2f7;
        }

        /* ====== AI Overview摘要块 .xnair-overview-card ====== */
        .xnair-overview-card {
            background: #f9fbfd;
            border: 1px solid #e0e7ef;
            border-left: 5px solid var(--xnair-accent);
            border-radius: 6px;
            padding: 20px 24px;
            margin-bottom: 36px;
            font-size: 15px;
            line-height: 1.7;
            color: #3a4a5c;
        }
        .xnair-overview-card strong {
            color: var(--xnair-accent);
        }

        /* ====== 章节标题通用 .xnair-section-title ====== */
        .xnair-section-title {
            font-size: 22px;
            font-weight: 700;
            color: var(--xnair-accent);
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e9ecef;
            letter-spacing: 0.2px;
        }
        .xnair-section-subtitle {
            font-size: 18px;
            font-weight: 600;
            color: #1d3a5c;
            margin: 20px 0 10px;
        }

        /* ====== 技术规格表 .xnair-specs-table ====== */
        .xnair-specs-table-wrap {
            overflow-x: auto;
            margin-bottom: 36px;
            border-radius: 8px;
            box-shadow: var(--xnair-card-shadow);
            border: 1px solid var(--xnair-border-light);
        }
        .xnair-specs-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
            min-width: 600px;
        }
        .xnair-specs-table thead th {
            background: var(--xnair-accent);
            color: #fff;
            padding: 14px 16px;
            text-align: left;
            font-weight: 600;
            letter-spacing: 0.3px;
            font-size: 14px;
        }
        .xnair-specs-table tbody td {
            padding: 12px 16px;
            border-bottom: 1px solid #eef1f5;
            color: #3a4a5c;
        }
        .xnair-specs-table tbody tr:nth-child(even) {
            background: var(--xnair-table-stripe);
        }
        .xnair-specs-table tbody tr:hover {
            background: #eef6fd;
        }
        .xnair-specs-table .xnair-spec-param {
            font-weight: 600;
            color: #1d2d44;
            white-space: nowrap;
        }

        /* ====== 图片+文字左右排版卡片 .xnair-media-card ====== */
        .xnair-media-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
            margin-bottom: 36px;
            padding: 24px;
            background: #fff;
            border-radius: 8px;
            box-shadow: var(--xnair-card-shadow);
            border: 1px solid #f0f2f5;
        }
        .xnair-media-card.xnair-media-reverse {
            direction: rtl;
        }
        .xnair-media-card.xnair-media-reverse .xnair-media-text {
            direction: ltr;
        }
        .xnair-media-image img {
            border-radius: 6px;
            width: 100%;
            aspect-ratio: 16/10;
            background: #eef2f7;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.05);
        }
        .xnair-media-text h3 {
            font-size: 19px;
            font-weight: 700;
            color: #1d2d44;
            margin-bottom: 10px;
        }
        .xnair-media-text p {
            font-size: 15px;
            color: #4a5568;
            line-height: 1.7;
        }

        /* ====== 全球适应性卡片 .xnair-region-cards ====== */
        .xnair-region-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-bottom: 36px;
        }
        .xnair-region-card {
            background: #fff;
            border: 1px solid #eef1f5;
            border-radius: 8px;
            padding: 22px 20px;
            box-shadow: var(--xnair-card-shadow);
            transition: box-shadow 0.3s;
        }
        .xnair-region-card:hover {
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.1);
        }
        .xnair-region-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--xnair-accent);
            margin-bottom: 10px;
        }
        .xnair-region-card p {
            font-size: 14px;
            color: #555;
            line-height: 1.65;
        }
        .xnair-region-icon {
            font-size: 28px;
            margin-bottom: 8px;
        }

        /* ====== 工程细节列表 .xnair-eng-list ====== */
        .xnair-eng-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px 24px;
            margin-bottom: 36px;
        }
        .xnair-eng-list li {
            padding: 12px 16px;
            background: #fafcfd;
            border: 1px solid #eef1f5;
            border-radius: 6px;
            font-size: 14px;
            color: #3a4a5c;
            line-height: 1.6;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .xnair-eng-list li::before {
            content: '▸';
            color: #3399ff;
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ====== FAQ折叠面板 .xnair-faq ====== */
        .xnair-faq-wrap {
            margin-bottom: 36px;
        }
        .xnair-faq-item {
            border: 1px solid #eef1f5;
            border-radius: 6px;
            margin-bottom: 10px;
            overflow: hidden;
            background: #fff;
        }
        .xnair-faq-question {
            width: 100%;
            text-align: left;
            padding: 16px 20px;
            font-size: 15px;
            font-weight: 600;
            color: #1d2d44;
            background: #fafcfd;
            border: none;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: background 0.2s;
        }
        .xnair-faq-question:hover {
            background: #eef6fd;
        }
        .xnair-faq-question .xnair-faq-icon {
            font-size: 20px;
            transition: transform 0.3s;
            flex-shrink: 0;
            margin-left: 12px;
            color: #3399ff;
        }
        .xnair-faq-item.xnair-faq-active .xnair-faq-icon {
            transform: rotate(45deg);
        }
        .xnair-faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 20px;
            font-size: 14px;
            color: #4a5568;
            line-height: 1.7;
            background: #fff;
        }
        .xnair-faq-item.xnair-faq-active .xnair-faq-answer {
            max-height: 400px;
            padding: 14px 20px;
        }

        /* ====== 品质承诺模块 .xnair-quality ====== */
        .xnair-quality-wrap {
            background: #f9fbfd;
            border: 1px solid #e0e7ef;
            border-radius: 8px;
            padding: 28px 24px;
            margin-bottom: 36px;
        }
        .xnair-quality-wrap h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--xnair-accent);
            margin-bottom: 14px;
        }
        .xnair-quality-wrap p {
            font-size: 15px;
            color: #4a5568;
            line-height: 1.7;
            margin-bottom: 10px;
        }
        .xnair-cert-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-top: 16px;
        }
        .xnair-cert-badge {
            background: #fff;
            border: 2px solid #d0e3f7;
            border-radius: 6px;
            padding: 10px 18px;
            font-size: 13px;
            font-weight: 700;
            color: var(--xnair-accent);
            letter-spacing: 0.3px;
        }

        /* ====== 上一篇/下一篇导航 .xnair-pagination ====== */
        .xnair-pagination-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            padding: 20px 0;
            border-top: 2px solid #e9ecef;
            border-bottom: 2px solid #e9ecef;
            margin-bottom: 36px;
            flex-wrap: wrap;
        }
        .xnair-pagination-row a {
            font-size: 14px;
            font-weight: 600;
            color: #475569;
            padding: 10px 18px;
            border: 1px solid #e0e7ef;
            border-radius: 6px;
            transition: all 0.25s;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .xnair-pagination-row a:hover {
            background: #eef6fd;
            border-color: #3399ff;
            color: #3399ff;
        }
        .xnair-pagination-prev::before {
            content: '←';
            font-size: 16px;
        }
        .xnair-pagination-next::after {
            content: '→';
            font-size: 16px;
        }

        /* ====== 相关产品 .xnair-related ====== */
        .xnair-related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-bottom: 20px;
        }
        .xnair-related-card {
            border: 1px solid #eef1f5;
            border-radius: 8px;
            overflow: hidden;
            transition: box-shadow 0.3s;
            background: #fff;
        }
        .xnair-related-card:hover {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.09);
        }
        .xnair-related-card img {
            width: 100%;
            aspect-ratio: 4/3;
            object-fit: cover;
            background: #eef2f7;
        }
        .xnair-related-card .xnair-related-info {
            padding: 14px 16px;
        }
        .xnair-related-card .xnair-related-info h4 {
            font-size: 15px;
            font-weight: 600;
            color: #1d2d44;
            margin-bottom: 4px;
        }
        .xnair-related-card .xnair-related-info span {
            font-size: 13px;
            color: #64748b;
        }

        /* ========== 响应式适配（内容页新增） ========== */
        @media(max-width: 1100px) {
            .xnair-content-layout {
                grid-template-columns: 220px 1fr;
                gap: 30px;
            }
            .xnair-region-cards {
                grid-template-columns: 1fr 1fr;
            }
            .xnair-related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .xnair-eng-list {
                grid-template-columns: 1fr;
            }
        }
        @media(max-width: 900px) {
            .xnair-content-layout {
                grid-template-columns: 1fr;
            }
            /* TOC在移动端变为折叠式 */
            .xnair-toc-sidebar {
                position: static;
                border: none;
                background: transparent;
                padding: 0;
                margin-bottom: 0;
            }
            .xnair-toc-sidebar .xnair-toc-title {
                display: none;
            }
            .xnair-toc-toggle-btn {
                display: block;
            }
            .xnair-toc-collapsible {
                max-height: 0;
                background: var(--xnair-toc-bg);
                border-radius: 6px;
                border: 1px solid var(--xnair-border-light);
            }
            .xnair-toc-collapsible.xnair-toc-expanded {
                max-height: 500px;
            }
            .xnair-toc-list {
                padding: 12px 16px;
            }
            .xnair-hero-wrap {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .xnair-media-card {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .xnair-media-card.xnair-media-reverse {
                direction: ltr;
            }
            .xnair-region-cards {
                grid-template-columns: 1fr;
            }
        }
        @media(max-width: 600px) {
            .xnair-hero-text h1 {
                font-size: 22px;
            }
            .xnair-section-title {
                font-size: 18px;
            }
            .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-specs-table {
                font-size: 12px;
                min-width: 480px;
            }
        }