/* ========== 全站共用变量（必须最先引入，所有页面共用配色 ========== */
        :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;
        }

        /* ========== 全局基础重置（所有页面通用） ========== */
        * {
            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（页面版心通用） ========== */
        .container {
            width: 100%;
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ========== 顶部信息条 top-bar 样式 ========== */
        .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 ========== */
        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 ========== */
        .menu-toggle {
            display: none;
            font-size: 28px;
            cursor: pointer;
            color: var(--dark-charcoal);
            padding: 8px;
            flex-shrink: 0;
        }

        /* ========== 移动端768px适配：导航折叠、Logo左汉堡右 ========== */
        @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;
            }
        }

        /* ========== 页脚样式 ========== */
        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;
        }

        /* 响应式适配页脚部分 */
        @media(max-width: 1200px) {
            .footer-row {
                grid-template-columns: repeat(3, 1fr);
                gap: 25px;
            }
        }
        @media(max-width: 768px) {
            .footer-row {
                grid-template-columns: 1fr;
            }
        }

        /* ================================================================
           ========== xnair 产品详情页定制样式（.xnair- 命名空间，避免冲突） ==========
           ================================================================ */

        /* -------- 面包屑导航 .xnair-breadcrumb -------- */
        .xnair-breadcrumb-wrap {
            background-color: #f8fafc;
            border-bottom: 1px solid var(--border-color);
            padding: 14px 0;
        }
        .xnair-breadcrumb {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: #64748b;
        }
        .xnair-breadcrumb li {
            display: inline-flex;
            align-items: center;
        }
        .xnair-breadcrumb li a {
            color: var(--accent-blue);
            font-weight: 500;
        }
        .xnair-breadcrumb li a:hover {
            color: #3399ff;
            text-decoration: underline;
        }
        .xnair-breadcrumb .xnair-breadcrumb-sep {
            margin: 0 4px;
            color: #94a3b8;
            user-select: none;
        }
        .xnair-breadcrumb .xnair-breadcrumb-current {
            color: var(--text-main);
            font-weight: 600;
            pointer-events: none;
        }

        /* -------- 内容区主容器：桌面端两栏（内容 + 悬浮TOC） -------- */
        .xnair-product-page {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            max-width: 1400px;
            margin: 0 auto;
            padding: 40px 40px 60px;
            align-items: start;
        }

        /* -------- 左侧主内容区 -------- */
        .xnair-main-content {
            min-width: 0;
        }

        /* -------- Hero Section -------- */
        .xnair-hero-wrap {
            margin-bottom: 36px;
        }
        .xnair-hero-wrap h1 {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .xnair-hero-subtitle {
            font-size: 17px;
            color: #64748b;
            margin-bottom: 24px;
            line-height: 1.5;
            max-width: 700px;
        }
        .xnair-hero-img-wrap {
            border-radius: 10px;
            overflow: hidden;
            background: #f1f5f9;
            border: 1px solid var(--border-color);
            aspect-ratio: 16 / 9;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .xnair-hero-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
        }

        /* -------- AI Overview 摘要卡片 -------- */
        .xnair-overview-card {
            background: #f0f7ff;
            border-left: 5px solid var(--accent-blue);
            border-radius: 8px;
            padding: 24px 28px;
            margin-bottom: 36px;
            font-size: 15px;
            color: var(--dark-charcoal);
            line-height: 1.65;
        }
        .xnair-overview-card strong {
            color: var(--primary-blue);
            font-weight: 700;
        }

        /* -------- 通用 section 标题 -------- */
        .xnair-section-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 18px;
            padding-bottom: 10px;
            border-bottom: 3px solid #e6f5ff;
            letter-spacing: -0.2px;
        }
        .xnair-section-subtitle {
            font-size: 20px;
            font-weight: 700;
            color: var(--accent-blue);
            margin-bottom: 12px;
            margin-top: 28px;
        }

        /* -------- 技术参数表 .xnair-specs-table -------- */
        .xnair-specs-table-wrap {
            overflow-x: auto;
            margin-bottom: 36px;
            -webkit-overflow-scrolling: touch;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            background: #fff;
        }
        .xnair-specs-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 14px;
            min-width: 700px;
        }
        .xnair-specs-table thead th {
            background: var(--primary-blue);
            color: #fff;
            padding: 14px 12px;
            text-align: center;
            font-weight: 600;
            font-size: 13px;
            letter-spacing: 0.3px;
            white-space: nowrap;
            border-right: 1px solid rgba(255, 255, 255, 0.15);
        }
        .xnair-specs-table thead th:last-child {
            border-right: none;
        }
        .xnair-specs-table tbody td {
            padding: 11px 12px;
            text-align: center;
            border-bottom: 1px solid var(--border-color);
            font-variant-numeric: tabular-nums;
            font-family: "SF Mono", "Consolas", "Monaco", monospace;
            font-size: 13px;
            color: var(--dark-charcoal);
        }
        .xnair-specs-table tbody tr:nth-child(even) {
            background: #f8fafc;
        }
        .xnair-specs-table tbody tr:hover {
            background: #e6f5ff;
        }
        .xnair-specs-table tbody td:first-child {
            font-weight: 600;
            color: var(--primary-blue);
            text-align: left;
            padding-left: 16px;
            white-space: nowrap;
        }
        .xnair-table-note {
            font-size: 12px;
            color: #94a3b8;
            margin-top: 8px;
            font-style: italic;
        }

        /* -------- 应用场景卡片网格 -------- */
        .xnair-app-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-bottom: 36px;
        }
        .xnair-app-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            overflow: hidden;
            transition: box-shadow 0.3s ease;
        }
        .xnair-app-card:hover {
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .xnair-app-card-img {
            aspect-ratio: 4 / 3;
            background: #f1f5f9;
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }
        .xnair-app-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .xnair-app-card-body {
            padding: 18px 20px;
        }
        .xnair-app-card-body h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 6px;
        }
        .xnair-app-card-body p {
            font-size: 14px;
            color: #64748b;
            line-height: 1.5;
        }

        /* -------- 工程细节列表 -------- */
        .xnair-eng-list {
            list-style: none;
            margin-bottom: 36px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .xnair-eng-list li {
            background: #f8fafc;
            border-radius: 8px;
            padding: 16px 18px;
            font-size: 14px;
            line-height: 1.55;
            border: 1px solid var(--border-color);
            color: var(--dark-charcoal);
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .xnair-eng-list li::before {
            content: "▸";
            color: var(--accent-blue);
            font-weight: 700;
            flex-shrink: 0;
            font-size: 16px;
            line-height: 1.4;
        }
        .xnair-eng-img-wrap {
            border-radius: 10px;
            overflow: hidden;
            background: #f1f5f9;
            border: 1px solid var(--border-color);
            margin-bottom: 36px;
            aspect-ratio: 16 / 7;
        }
        .xnair-eng-img-wrap img {
            width: 100%;
            height: 100%;
        }

        /* -------- 全球适应性子区块 -------- */
        .xnair-global-block {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 22px 26px;
            margin-bottom: 18px;
        }
        .xnair-global-block h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--accent-blue);
            margin-bottom: 8px;
        }
        .xnair-global-block p {
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.6;
        }

        /* -------- 物流与质检图片行 -------- */
        .xnair-dual-img-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-bottom: 36px;
        }
        .xnair-dual-img-item {
            border-radius: 10px;
            overflow: hidden;
            background: #f1f5f9;
            border: 1px solid var(--border-color);
            aspect-ratio: 4 / 3;
        }
        .xnair-dual-img-item img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .xnair-dual-img-caption {
            font-size: 13px;
            color: #64748b;
            text-align: center;
            margin-top: 6px;
        }

        /* -------- FAQ 折叠面板（纯CSS手风琴） -------- */
        .xnair-faq-wrap {
            margin-bottom: 36px;
        }
        .xnair-faq-item {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 10px;
            overflow: hidden;
        }
        .xnair-faq-q {
            display: block;
            cursor: pointer;
            padding: 16px 20px;
            font-weight: 700;
            font-size: 16px;
            color: var(--primary-blue);
            background: #f8fafc;
            user-select: none;
            position: relative;
            transition: background 0.25s ease;
        }
        .xnair-faq-q:hover {
            background: #e6f5ff;
        }
        .xnair-faq-q::after {
            content: "+";
            position: absolute;
            right: 20px;
            font-size: 22px;
            font-weight: 400;
            color: var(--accent-blue);
            transition: transform 0.3s ease;
        }
        .xnair-faq-checkbox {
            display: none;
        }
        .xnair-faq-checkbox:checked+.xnair-faq-q {
            background: #e6f5ff;
        }
        .xnair-faq-checkbox:checked+.xnair-faq-q::after {
            content: "−";
            transform: rotate(0deg);
        }
        .xnair-faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            background: #fff;
            padding: 0 20px;
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.65;
        }
        .xnair-faq-checkbox:checked+.xnair-faq-q+.xnair-faq-a {
            max-height: 400px;
            padding: 16px 20px;
        }

        /* -------- 品质认证模块 -------- */
        .xnair-quality-wrap {
            background: #f8fafc;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 28px 30px;
            margin-bottom: 36px;
        }
        .xnair-quality-wrap h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 16px;
        }
        .xnair-quality-wrap p {
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.65;
            margin-bottom: 10px;
        }
        .xnair-quality-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 16px;
        }
        .xnair-quality-badge {
            display: inline-block;
            background: #fff;
            border: 2px solid var(--accent-blue);
            color: var(--accent-blue);
            font-weight: 700;
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 14px;
            letter-spacing: 0.3px;
        }

        /* -------- 相关产品推荐卡片 -------- */
        .xnair-related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-bottom: 36px;
        }
        .xnair-related-card {
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            transition: box-shadow 0.3s ease;
            background: #fff;
        }
        .xnair-related-card:hover {
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
        }
        .xnair-related-card h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 6px;
        }
        .xnair-related-card p {
            font-size: 13px;
            color: #64748b;
        }
        .xnair-related-card a {
            color: var(--accent-blue);
            font-weight: 600;
            font-size: 14px;
            display: inline-block;
            margin-top: 8px;
        }
        .xnair-related-card a:hover {
            color: #3399ff;
            text-decoration: underline;
        }

        /* -------- 上一篇/下一篇导航 -------- */
        .xnair-pagination-row {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }
        .xnair-pagination-link {
            font-weight: 600;
            font-size: 15px;
            color: var(--accent-blue);
            padding: 12px 20px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .xnair-pagination-link:hover {
            background: #e6f5ff;
            border-color: var(--accent-blue);
            color: var(--primary-blue);
        }

        /* ========== 右侧悬浮TOC侧边栏（桌面端sticky） ========== */
        .xnair-toc-sidebar {
            position: sticky;
            top: 100px;
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 24px 20px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        .xnair-toc-sidebar h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 14px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        /* TOC列表：强制上下排列 */
        .xnair-toc-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .xnair-toc-list li {
            border-bottom: 1px solid #f1f5f9;
        }
        .xnair-toc-list li:last-child {
            border-bottom: none;
        }
        .xnair-toc-list li a {
            display: block;
            padding: 10px 8px;
            font-size: 14px;
            color: var(--text-main);
            font-weight: 500;
            transition: all 0.25s ease;
            border-radius: 4px;
            line-height: 1.4;
        }
        .xnair-toc-list li a:hover {
            background: #e6f5ff;
            color: var(--accent-blue);
            padding-left: 14px;
        }

        /* -------- 移动端TOC（内联于主内容区，默认隐藏） -------- */
        .xnair-toc-inline {
            display: none;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 20px 18px;
            margin-bottom: 28px;
            background: #fafbfc;
        }
        .xnair-toc-inline h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 10px;
        }
        .xnair-toc-inline ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .xnair-toc-inline ul li {
            border-bottom: 1px solid #e8ecf1;
        }
        .xnair-toc-inline ul li:last-child {
            border-bottom: none;
        }
        .xnair-toc-inline ul li a {
            display: block;
            padding: 9px 6px;
            font-size: 14px;
            color: var(--text-main);
            font-weight: 500;
        }
        .xnair-toc-inline ul li a:hover {
            color: var(--accent-blue);
        }

        /* ========== 响应式断点 ========== */
        @media(max-width: 1100px) {
            .xnair-product-page {
                grid-template-columns: 1fr;
                gap: 32px;
                padding: 28px 24px 48px;
            }
            /* 桌面端侧边栏TOC隐藏 */
            .xnair-toc-sidebar {
                display: none;
            }
            /* 移动端内联TOC显示 */
            .xnair-toc-inline {
                display: block;
            }
            .xnair-hero-wrap h1 {
                font-size: 26px;
            }
            .xnair-app-grid {
                grid-template-columns: 1fr;
            }
            .xnair-eng-list {
                grid-template-columns: 1fr;
            }
            .xnair-dual-img-row {
                grid-template-columns: 1fr;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr 1fr;
            }
            .xnair-pagination-row {
                flex-direction: column;
                gap: 12px;
            }
        }
        @media(max-width: 600px) {
            .xnair-product-page {
                padding: 20px 16px 36px;
            }
            .xnair-hero-wrap h1 {
                font-size: 22px;
            }
            .xnair-hero-subtitle {
                font-size: 15px;
            }
            .xnair-section-title {
                font-size: 20px;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr;
            }
            .xnair-specs-table {
                font-size: 12px;
                min-width: 560px;
            }
            .xnair-specs-table thead th {
                padding: 10px 8px;
                font-size: 11px;
            }
            .xnair-specs-table tbody td {
                padding: 8px 6px;
                font-size: 11px;
            }
            .xnair-overview-card {
                padding: 16px 18px;
                font-size: 14px;
            }
            .xnair-quality-wrap {
                padding: 18px 16px;
            }
            .xnair-toc-inline {
                padding: 14px 12px;
            }
        }