/* ========== 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;
        }
        @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 Projects 栏目封面页专属样式（xnair- 命名空间，防AI特征）
           ================================================================ */

        /* ========== 面包屑导航样式 ========== */
        .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: flex;
            align-items: center;
            gap: 6px;
        }
        .xnair-breadcrumb li a {
            color: var(--accent-blue);
            font-weight: 500;
        }
        .xnair-breadcrumb li a:hover {
            color: #3399ff;
            text-decoration: underline;
        }
        .xnair-breadcrumb-sep {
            color: #94a3b8;
            user-select: none;
        }
        .xnair-breadcrumb .xnair-current {
            color: var(--text-main);
            font-weight: 600;
            pointer-events: none;
        }

        /* ========== 页面主内容区 ========== */
        .xnair-projects-main {
            padding: 50px 0 60px;
        }

        /* ========== 首屏区域：H1 + 核心参数 + 主图 ========== */
        .xnair-hero-header {
            margin-bottom: 36px;
        }
        .xnair-hero-header h1 {
            font-size: 2.25rem;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .xnair-hero-intro {
            font-size: 1.1rem;
            color: #475569;
            max-width: 860px;
            line-height: 1.7;
            margin-bottom: 24px;
        }
        .xnair-hero-intro strong {
            color: var(--accent-blue);
            font-weight: 700;
        }
        /* 首屏核心主图：独占 fetchpriority="high" + loading="eager" */
        .xnair-hero-img {
            width: 100%;
            border-radius: 6px;
            margin-bottom: 48px;
            border: 1px solid var(--border-color);
            aspect-ratio: 16 / 7;
            background-color: #eef2f6;
        }

        /* ========== 四大类别卡片网格 ========== */
        .xnair-sectors-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
            margin-bottom: 56px;
        }
        .xnair-sector-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: box-shadow 0.3s ease, transform 0.2s ease;
            display: flex;
            flex-direction: column;
        }
        .xnair-sector-card:hover {
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
            transform: translateY(-2px);
        }
        .xnair-sector-card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            background-color: #eef2f6;
            border-bottom: 1px solid var(--border-color);
        }
        .xnair-sector-card-body {
            padding: 24px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .xnair-sector-card-body h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 8px;
            line-height: 1.35;
        }
        .xnair-sector-card-body p {
            font-size: 0.95rem;
            color: #475569;
            line-height: 1.6;
            margin-bottom: 14px;
            flex: 1;
        }
        .xnair-sector-specs-row {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 16px;
            font-size: 0.85rem;
            color: #64748b;
        }
        .xnair-sector-specs-row span {
            background: #f1f5f9;
            padding: 5px 10px;
            border-radius: 4px;
            white-space: nowrap;
            font-weight: 500;
        }
        .xnair-sector-link {
            display: inline-block;
            font-weight: 700;
            color: #3399ff;
            font-size: 0.95rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s ease;
            align-self: flex-start;
        }
        .xnair-sector-link:hover {
            border-bottom-color: #3399ff;
        }

        /* ========== 对比表格样式 ========== */
        .xnair-compare-section {
            margin-bottom: 56px;
        }
        .xnair-compare-section h2 {
            font-size: 1.65rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 20px;
            letter-spacing: -0.2px;
        }
        .xnair-compare-section h2+p {
            color: #475569;
            margin-bottom: 20px;
            max-width: 800px;
            line-height: 1.7;
        }
        /* 表格滚动容器：移动端横向滚动 */
        .xnair-table-scroll {
            width: 100%;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            border: 1px solid var(--border-color);
            border-radius: 6px;
        }
        .xnair-specs-table {
            width: 100%;
            min-width: 820px;
            border-collapse: collapse;
            font-size: 0.93rem;
            background: #fff;
        }
        .xnair-specs-table thead th {
            background-color: var(--primary-blue);
            color: #fff;
            font-weight: 600;
            padding: 14px 16px;
            text-align: left;
            font-size: 0.9rem;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .xnair-specs-table tbody td {
            padding: 13px 16px;
            border-bottom: 1px solid var(--border-color);
            color: #334155;
            vertical-align: top;
        }
        .xnair-specs-table tbody tr:nth-child(even) {
            background-color: #f8fafc;
        }
        .xnair-specs-table tbody tr:hover {
            background-color: #eef5fb;
        }

        /* ========== FAQ问答区样式 ========== */
        .xnair-faq-section {
            margin-bottom: 56px;
        }
        .xnair-faq-section h2 {
            font-size: 1.65rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 24px;
            letter-spacing: -0.2px;
        }
        .xnair-qa-item {
            border: 1px solid var(--border-color);
            border-radius: 6px;
            margin-bottom: 12px;
            overflow: hidden;
            background: #fff;
        }
        .xnair-qa-question {
            font-weight: 700;
            color: var(--primary-blue);
            padding: 16px 20px;
            font-size: 1rem;
            cursor: default;
            background: #f8fafc;
            border-bottom: 1px solid transparent;
            transition: background 0.2s;
        }
        .xnair-qa-item:hover .xnair-qa-question {
            background: #eef5fb;
        }
        .xnair-qa-answer {
            padding: 16px 20px;
            font-size: 0.95rem;
            color: #475569;
            line-height: 1.7;
        }

        /* ========== 品质承诺与工业资质模块 ========== */
        .xnair-quality-module {
            background: #f8fafc;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 32px 30px;
            margin-bottom: 48px;
        }
        .xnair-quality-module h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 18px;
            letter-spacing: -0.2px;
        }
        .xnair-quality-module p {
            color: #475569;
            line-height: 1.7;
            margin-bottom: 14px;
            font-size: 0.95rem;
        }
        .xnair-quality-module ul {
            list-style: disc;
            padding-left: 22px;
            color: #475569;
            line-height: 1.8;
            font-size: 0.95rem;
            margin-bottom: 14px;
        }
        .xnair-cert-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-top: 20px;
        }
        .xnair-cert-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 10px 16px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary-blue);
        }
        .xnair-cert-badge-icon {
            font-size: 1.3rem;
        }

        /* ========== 相关推荐内链板块 ========== */
        .xnair-related-section {
            margin-bottom: 48px;
        }
        .xnair-related-section h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 20px;
            letter-spacing: -0.2px;
        }
        .xnair-related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .xnair-related-item {
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 18px 16px;
            background: #fff;
            transition: box-shadow 0.3s;
        }
        .xnair-related-item:hover {
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.07);
        }
        .xnair-related-item h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--accent-blue);
            margin-bottom: 6px;
            line-height: 1.4;
        }
        .xnair-related-item p {
            font-size: 0.83rem;
            color: #64748b;
            line-height: 1.5;
            margin-bottom: 8px;
        }
        .xnair-related-item a {
            font-weight: 600;
            color: #3399ff;
            font-size: 0.85rem;
        }
        .xnair-related-item a:hover {
            text-decoration: underline;
        }

        /* ========== 上一篇/下一篇导航 ========== */
        .xnair-prevnext-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
            padding: 24px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 20px;
        }
        .xnair-prevnext-link {
            font-weight: 600;
            color: var(--accent-blue);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: color 0.2s;
        }
        .xnair-prevnext-link:hover {
            color: #3399ff;
        }
        .xnair-prevnext-arrow {
            font-size: 1.2rem;
            line-height: 1;
        }

        /* ================================================================
            响应式适配：Projects 页面专属
            ================================================================ */
        @media(max-width: 1024px) {
            .xnair-sectors-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .xnair-related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .xnair-hero-header h1 {
                font-size: 1.85rem;
            }
        }
        @media(max-width: 768px) {
            .xnair-projects-main {
                padding: 30px 0 40px;
            }
            .xnair-hero-header h1 {
                font-size: 1.55rem;
            }
            .xnair-hero-intro {
                font-size: 1rem;
            }
            .xnair-hero-img {
                aspect-ratio: 4 / 3;
                margin-bottom: 32px;
            }
            /* 四大类别卡片：移动端单列堆叠 */
            .xnair-sectors-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .xnair-sector-card-body {
                padding: 18px 14px 16px;
            }
            .xnair-sector-card-body h3 {
                font-size: 1.1rem;
            }
            /* 对比表格：移动端保持横向滚动 */
            .xnair-specs-table {
                min-width: 680px;
                font-size: 0.8rem;
            }
            .xnair-specs-table thead th,
            .xnair-specs-table tbody td {
                padding: 10px 10px;
            }
            .xnair-compare-section h2,
            .xnair-faq-section h2,
            .xnair-quality-module h2,
            .xnair-related-section h2 {
                font-size: 1.35rem;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .xnair-prevnext-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .xnair-breadcrumb {
                font-size: 13px;
            }
            .xnair-quality-module {
                padding: 22px 16px;
            }
            .xnair-cert-badges {
                gap: 10px;
            }
            .xnair-cert-badge {
                padding: 8px 12px;
                font-size: 0.8rem;
            }
        }
        @media(max-width: 480px) {
            .xnair-hero-header h1 {
                font-size: 1.35rem;
            }
            .xnair-related-grid {
                grid-template-columns: 1fr;
            }
            .xnair-specs-table {
                min-width: 560px;
                font-size: 0.75rem;
            }
            .xnair-sector-specs-row span {
                font-size: 0.75rem;
                padding: 4px 8px;
            }
        }