/* ============================================================
           ========== 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;
            --xnair-spec-bg: #f8fafc;
            --xnair-accent-warm: #e07b39;
            --xnair-green-ok: #2d8b4e;
            --xnair-table-stripe: #f1f5f9;
        }

        /* ========== 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;
            }
        }

        /* ============================================================
           ========== XNAIR 产品详情页专属样式（xnair- 命名空间） ==========
           ============================================================ */

        /* ----- 面包屑导航 xnair-breadcrumb ----- */
        .xnair-breadcrumb-wrap {
            background: #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;
        }
        .xnair-breadcrumb a {
            color: var(--accent-blue);
            font-weight: 500;
        }
        .xnair-breadcrumb a:hover {
            color: #3399ff;
            text-decoration: underline;
        }
        .xnair-breadcrumb .xnair-breadcrumb-sep {
            color: #cbd5e1;
            user-select: none;
        }
        .xnair-breadcrumb .xnair-breadcrumb-current {
            color: var(--dark-charcoal);
            font-weight: 600;
            pointer-events: none;
        }

        /* ----- Hero 区域 xnair-hero ----- */
        .xnair-hero-wrap {
            background: linear-gradient(180deg, #f0f4f8 0%, #ffffff 100%);
            padding: 40px 0 50px;
        }
        .xnair-hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .xnair-hero-content h1 {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .xnair-hero-content .xnair-hero-subtitle {
            font-size: 1.05rem;
            color: #475569;
            margin-bottom: 20px;
            line-height: 1.7;
        }
        .xnair-hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 22px;
        }
        .xnair-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #e6f0fa;
            color: var(--accent-blue);
            font-size: 13px;
            font-weight: 600;
            padding: 8px 14px;
            border-radius: 20px;
            letter-spacing: 0.2px;
        }
        .xnair-hero-cta {
            display: inline-block;
            background: var(--accent-blue);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            padding: 14px 32px;
            border-radius: 6px;
            letter-spacing: 0.3px;
            transition: background 0.25s ease, box-shadow 0.25s ease;
        }
        .xnair-hero-cta:hover {
            background: #0f3560;
            box-shadow: 0 6px 18px rgba(11, 37, 69, 0.2);
            color: #fff;
        }
        .xnair-hero-image {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            background: #fff;
        }
        .xnair-hero-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        /* ----- 响应式TOC目录 xnair-toc ----- */
        .xnair-toc-wrap {
            background: #fff;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 80px;
            z-index: 99;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
        }
        .xnair-toc {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0;
            padding: 0;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
        }
        .xnair-toc-label {
            font-weight: 700;
            font-size: 14px;
            color: var(--dark-charcoal);
            padding: 14px 18px 14px 0;
            white-space: nowrap;
            flex-shrink: 0;
            letter-spacing: 0.5px;
            border-right: 2px solid var(--border-color);
            margin-right: 8px;
        }
        .xnair-toc a {
            display: inline-block;
            font-size: 13.5px;
            font-weight: 500;
            color: #475569;
            padding: 14px 16px;
            white-space: nowrap;
            border-bottom: 3px solid transparent;
            transition: all 0.2s ease;
            flex-shrink: 0;
        }
        .xnair-toc a:hover {
            color: var(--accent-blue);
            background: #f8fafc;
            border-bottom-color: #8da9c4;
        }
        .xnair-toc-toggle {
            display: none;
            background: var(--accent-blue);
            color: #fff;
            border: none;
            font-size: 14px;
            font-weight: 600;
            padding: 10px 18px;
            border-radius: 6px;
            cursor: pointer;
            letter-spacing: 0.3px;
            margin: 10px 0;
        }

        /* ----- AI摘要模块 xnair-ai-summary ----- */
        .xnair-ai-summary-wrap {
            background: #fefdf8;
            border-left: 4px solid var(--xnair-accent-warm);
            padding: 22px 28px;
            margin: 30px 0;
            border-radius: 0 8px 8px 0;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
        }
        .xnair-ai-summary-wrap h2 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--xnair-accent-warm);
            letter-spacing: 0.8px;
            text-transform: uppercase;
            margin-bottom: 8px;
        }
        .xnair-ai-summary-wrap p {
            font-size: 0.98rem;
            color: #4a5568;
            line-height: 1.75;
            max-width: 900px;
        }

        /* ----- 主内容两栏布局 xnair-content-grid ----- */
        .xnair-content-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 50px;
            padding: 40px 0;
        }
        .xnair-main-col h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin: 40px 0 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e2e8f0;
            letter-spacing: -0.2px;
        }
        .xnair-main-col h2:first-of-type {
            margin-top: 0;
        }
        .xnair-main-col h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--accent-blue);
            margin: 28px 0 10px;
        }
        .xnair-main-col p {
            font-size: 0.98rem;
            color: #475569;
            line-height: 1.75;
            margin-bottom: 14px;
        }
        .xnair-main-col ul,
        .xnair-main-col ol {
            margin: 10px 0 18px 22px;
            color: #475569;
            line-height: 1.75;
        }
        .xnair-main-col ul li,
        .xnair-main-col ol li {
            margin-bottom: 6px;
            font-size: 0.96rem;
        }

        /* ----- 侧边栏 xnair-sidebar ----- */
        .xnair-sidebar {
            position: sticky;
            top: 160px;
            align-self: start;
        }
        .xnair-sidebar-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
        }
        .xnair-sidebar-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark-charcoal);
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .xnair-sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .xnair-sidebar-card ul li {
            margin-bottom: 8px;
        }
        .xnair-sidebar-card ul li a {
            font-size: 0.93rem;
            color: var(--accent-blue);
            font-weight: 500;
            display: block;
            padding: 6px 0;
            border-bottom: 1px dotted #e2e8f0;
        }
        .xnair-sidebar-card ul li a:hover {
            color: #3399ff;
            padding-left: 6px;
        }
        .xnair-sidebar-inquiry {
            background: var(--primary-blue);
            color: #fff;
            text-align: center;
            padding: 28px 20px;
            border-radius: 8px;
        }
        .xnair-sidebar-inquiry h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: #fff;
        }
        .xnair-sidebar-inquiry p {
            font-size: 0.9rem;
            margin-bottom: 16px;
            opacity: 0.85;
        }
        .xnair-sidebar-inquiry a {
            display: inline-block;
            background: #fff;
            color: var(--primary-blue);
            font-weight: 700;
            padding: 12px 28px;
            border-radius: 6px;
            font-size: 14px;
            letter-spacing: 0.3px;
        }
        .xnair-sidebar-inquiry a:hover {
            background: #e6f0fa;
        }

        /* ----- 技术规格表 xnair-specs-table ----- */
        .xnair-specs-table-wrap {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            margin: 20px 0 30px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
        }
        .xnair-specs-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.94rem;
            min-width: 650px;
        }
        .xnair-specs-table thead th {
            background: var(--primary-blue);
            color: #fff;
            padding: 14px 16px;
            text-align: left;
            font-weight: 600;
            letter-spacing: 0.3px;
            font-size: 0.9rem;
            white-space: nowrap;
        }
        .xnair-specs-table tbody td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--border-color);
            color: #334155;
            vertical-align: top;
        }
        .xnair-specs-table tbody tr:nth-child(even) td {
            background: var(--xnair-table-stripe);
        }
        .xnair-specs-table tbody tr:hover td {
            background: #e8f0f8;
        }
        .xnair-specs-table .xnair-spec-label {
            font-weight: 700;
            color: var(--dark-charcoal);
            white-space: nowrap;
        }

        /* ----- 图片展示区 xnair-image-block ----- */
        .xnair-image-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 28px 0;
        }
        .xnair-image-block.xnair-image-single {
            grid-template-columns: 1fr;
        }
        .xnair-image-card {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            background: #fff;
            border: 1px solid var(--border-color);
        }
        .xnair-image-card img {
            width: 100%;
            height: auto;
            /*object-fit: cover;*/
            aspect-ratio: 16 / 10;
        }
        .xnair-image-card .xnair-image-caption {
            padding: 10px 14px;
            font-size: 0.85rem;
            color: #64748b;
            font-style: italic;
            background: #fafbfc;
            border-top: 1px solid var(--border-color);
        }

        /* ----- 品牌品质承诺模块 xnair-quality ----- */
        .xnair-quality-wrap {
            background: #f8fafc;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 32px 36px;
            margin: 40px 0 30px;
        }
        .xnair-quality-wrap h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 18px;
            border-bottom: none;
            padding-bottom: 0;
        }
        .xnair-quality-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 18px;
        }
        .xnair-quality-item {
            text-align: center;
            padding: 18px 14px;
            background: #fff;
            border-radius: 8px;
            border: 1px solid #e8ecf1;
        }
        .xnair-quality-item .xnair-quality-icon {
            font-size: 2.2rem;
            margin-bottom: 8px;
        }
        .xnair-quality-item h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--dark-charcoal);
            margin-bottom: 4px;
        }
        .xnair-quality-item p {
            font-size: 0.84rem;
            color: #64748b;
            line-height: 1.5;
        }

        /* ----- 分页导航 xnair-pagination ----- */
        .xnair-pagination-wrap {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 14px;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            padding: 18px 0;
            margin: 40px 0;
        }
        .xnair-pagination-wrap a {
            font-weight: 600;
            color: var(--accent-blue);
            font-size: 0.95rem;
            padding: 8px 16px;
            border-radius: 6px;
            background: #f8fafc;
            transition: all 0.2s ease;
            max-width: 48%;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        .xnair-pagination-wrap a:hover {
            background: #e6f0fa;
            color: #0b2545;
        }
        .xnair-pagination-wrap .xnair-pag-placeholder {
            color: #cbd5e1;
            font-size: 0.9rem;
            font-style: italic;
        }

        /* ----- 相关推荐 xnair-related ----- */
        .xnair-related-wrap {
            margin: 30px 0 40px;
        }
        .xnair-related-wrap h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--dark-charcoal);
            margin-bottom: 18px;
        }
        .xnair-related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .xnair-related-card {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: box-shadow 0.25s ease;
            background: #fff;
        }
        .xnair-related-card:hover {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        }
        .xnair-related-card img {
            width: 100%;
            aspect-ratio: 4/3;
            object-fit: cover;
            loading: lazy;
        }
        .xnair-related-card .xnair-related-title {
            padding: 12px 14px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--dark-charcoal);
            line-height: 1.4;
        }
        .xnair-related-card a {
            display: block;
            color: inherit;
        }

        /* ========== footer底部样式 ========== */
        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：产品详情页 ========== */
        @media(max-width: 1200px) {
            .footer-row {
                grid-template-columns: repeat(3, 1fr);
                gap: 25px;
            }
            .xnair-content-grid {
                grid-template-columns: 1fr 260px;
                gap: 30px;
            }
            .xnair-hero-grid {
                gap: 30px;
            }
            .xnair-hero-content h1 {
                font-size: 1.8rem;
            }
            .xnair-related-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .xnair-quality-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .xnair-image-block {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
        }
        @media(max-width: 1024px) {
            .xnair-content-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .xnair-sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .xnair-sidebar-inquiry {
                grid-column: span 2;
            }
            .xnair-hero-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .xnair-hero-image {
                max-width: 600px;
                margin: 0 auto;
            }
            .xnair-related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .xnair-quality-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .xnair-toc a {
                font-size: 12.5px;
                padding: 12px 10px;
            }
        }
        @media(max-width: 768px) {
            .footer-row {
                grid-template-columns: 1fr;
            }
            .xnair-hero-content h1 {
                font-size: 1.45rem;
            }
            .xnair-hero-content .xnair-hero-subtitle {
                font-size: 0.95rem;
            }
            .xnair-hero-wrap {
                padding: 24px 0 30px;
            }
            .xnair-content-grid {
                grid-template-columns: 1fr;
                gap: 16px;
                padding: 20px 0;
            }
            .xnair-sidebar {
                position: static;
                grid-template-columns: 1fr;
            }
            .xnair-sidebar-inquiry {
                grid-column: span 1;
            }
            .xnair-image-block {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .xnair-quality-grid {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .xnair-quality-wrap {
                padding: 20px 16px;
            }
            .xnair-specs-table-wrap {
                margin: 14px -10px;
                border-radius: 6px;
            }
            .xnair-toc {
                flex-wrap: nowrap;
                gap: 0;
            }
            .xnair-toc-label {
                font-size: 12px;
                padding: 10px 10px 10px 0;
                margin-right: 4px;
            }
            .xnair-toc a {
                font-size: 11.5px;
                padding: 10px 8px;
            }
            .xnair-pagination-wrap {
                flex-direction: column;
                align-items: stretch;
                text-align: center;
            }
            .xnair-pagination-wrap a {
                max-width: 100%;
                white-space: normal;
            }
            .xnair-ai-summary-wrap {
                padding: 16px 18px;
                margin: 20px 0;
            }
            .xnair-breadcrumb {
                font-size: 12.5px;
                gap: 4px;
            }
            .xnair-hero-badges {
                gap: 8px;
            }
            .xnair-hero-badge {
                font-size: 11.5px;
                padding: 6px 10px;
            }
            .xnair-hero-cta {
                font-size: 14px;
                padding: 12px 24px;
            }
        }
        @media(max-width: 480px) {
            .xnair-hero-content h1 {
                font-size: 1.25rem;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr;
            }
            .xnair-quality-grid {
                grid-template-columns: 1fr;
            }
            .xnair-main-col h2 {
                font-size: 1.3rem;
            }
            .xnair-main-col h3 {
                font-size: 1.05rem;
            }
        }