:root {
            --brand: #1a6fb5;
            --brand-dark: #145a8c;
            --brand-light: #e8f2f9;
            --brand-ghost: #f4f8fc;
            --cta: #d9304c;
            --cta-hover: #c02a3f;
            --text: #1a1a1a;
            --text-secondary: #555;
            --text-muted: #888;
            --border: #e0e4e8;
            --border-light: #eef0f3;
            --bg: #f8f9fb;
            --white: #fff;
            --radius: 8px;
            --radius-sm: 6px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
            --transition: all 0.2s ease;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text);
            line-height: 1.7;
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            font-size: 15px;
        }
        a { transition: var(--transition); }

        /* 顶部导航 */
        .top-bar {
            background: var(--white);
            border-bottom: 1px solid var(--border);
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .top-bar-inner {
            width: 100%;
            max-width: 1360px;
            padding: 0 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .top-bar .logo img { height: 32px; display: block; filter: brightness(0); }
        .top-bar .nav-group { display: flex; align-items: center; gap: 32px; }
        .top-bar nav { display: flex; gap: 24px; }
        .top-bar nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 0;
            border-bottom: 2px solid transparent;
            transition: var(--transition);
        }
        .top-bar nav a:hover,
        .top-bar nav a.active { color: var(--brand); border-bottom-color: var(--brand); }
        .top-bar .header-phone {
            display: flex;
            align-items: center;
            background: var(--cta);
            color: #fff;
            padding: 10px 18px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            white-space: nowrap;
            transition: var(--transition);
            box-shadow: 0 2px 6px rgba(217,48,76,0.2);
            letter-spacing: 0.3px;
        }
        .top-bar .header-phone:hover { background: var(--cta-hover); box-shadow: 0 4px 12px rgba(217,48,76,0.3); transform: translateY(-1px); }

        /* 面包屑 */
        .breadcrumb-wrap { background: var(--white); border-bottom: 1px solid var(--border); }
        .breadcrumb {
            max-width: 1360px;
            margin: 0 auto;
            padding: 12px 32px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .breadcrumb a { color: var(--text-secondary); text-decoration: none; }
        .breadcrumb a:hover { color: var(--brand); }
        .breadcrumb .sep { margin: 0 5px; color: #ccc; }
        .breadcrumb .current { color: var(--text); font-weight: 500; }

        /* 同类型号切换 */
        .model-switcher-wrap { max-width: 1360px; margin: 16px auto 0; padding: 0 32px; }
        .model-switcher {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 10px 20px;
            display: flex;
            gap: 4px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-sm);
            align-items: center;
        }
        .model-switcher .switcher-label { font-size: 13px; font-weight: 600; color: var(--text-muted); margin-right: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
        .model-switcher a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 13px;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 20px;
            transition: var(--transition);
            letter-spacing: 0.2px;
        }
        .model-switcher a:hover { background: var(--brand-light); color: var(--brand); }
        .model-switcher a.current {
            background: var(--brand);
            color: #fff;
            pointer-events: none;
            font-weight: 600;
            box-shadow: 0 2px 6px rgba(26,111,181,0.25);
        }

        /* 主内容容器 */
        .main-wrap { max-width: 1360px; margin: 20px auto 60px; padding: 0 32px; }

        /* 卡片系统 */
        .card {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 48px;
            margin-bottom: 20px;
            box-shadow: var(--shadow-sm);
        }
        .card--accent { border-left: 4px solid var(--brand); background: var(--brand-ghost); }
        .card--dark { background: #1a2733; color: #e0e6ec; border: none; }
        .card--dark h2, .card--dark h3 { color: #fff; }
        .card--dark h2::before { background: #5ba4d9; }
        .card--dark p { color: #bcc5cf; }

        /* 标题层级 */
        .section-label {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--brand);
            margin-bottom: 8px;
            padding: 4px 12px;
            background: var(--brand-light);
            border-radius: 20px;
        }
        h1 { font-size: 34px; font-weight: 700; color: #111; margin-bottom: 10px; letter-spacing: -0.5px; line-height: 1.2; }
        .subtitle { font-size: 16px; color: var(--text-secondary); line-height: 1.6; max-width: 600px; }
        h2 {
            font-size: 22px; font-weight: 700; color: #111; margin-bottom: 20px; letter-spacing: -0.3px;
            position: relative; padding-left: 16px;
        }
        h2::before { content: ''; position: absolute; left: 0; top: 4px; bottom: 4px; width: 4px; background: var(--brand); border-radius: 2px; }
        h3 { font-size: 17px; font-weight: 600; color: #222; margin-bottom: 10px; }
        p { color: var(--text-secondary); margin-bottom: 12px; }
        .text-sm { font-size: 13px; color: var(--text-muted); }
        .text-note { font-size: 13px; color: var(--text-muted); font-style: italic; margin-top: 6px; }

        /* 头部区域 */
        .hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
        @media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; gap: 24px; } }
        .hero-img { position: relative; background: #f0f3f7; border-radius: var(--radius); padding: 20px; text-align: center; border: 1px solid var(--border-light); }
        .hero-img img { width: 100%; height: auto; max-width: 320px; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.08)); }
        .hero-img .img-badge { position: absolute; top: 16px; right: 16px; background: var(--brand); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 12px; letter-spacing: 0.5px; }


        /* 技术标签 */
        .tech-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
        .tech-tag { display: inline-block; padding: 8px 16px; background: var(--white); color: var(--brand-dark); font-size: 13px; font-weight: 600; border-radius: 20px; letter-spacing: 0.3px; border: 1px solid var(--brand-light); }

        /* 三栏网格 */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 24px; }

        @media (max-width: 960px) { .grid-3 { grid-template-columns: 1fr; } }
        .feature-item { padding: 0; }
        .feature-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: #111; padding-top: 16px; border-top: 3px solid var(--brand); display: inline-block; }
        .feature-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.65; margin: 8px 0 0 0; }

        /* 双栏布局 */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
        @media (max-width: 960px) { .grid-2 { grid-template-columns: 1fr; } }

        /* 规格表格 */
        .spec-table { width: 100%; border-collapse: collapse; font-size: 14px; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border-light); }
        .spec-table th, .spec-table td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--border-light); }
        .spec-table th { background: #f6f8fa; font-weight: 600; color: var(--text-secondary); font-size: 12px; text-transform: uppercase; letter-spacing: 0.6px; width: 180px; white-space: nowrap; }
        .spec-table td { color: var(--text); }
        .spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }
        .spec-table tr:hover td { background: #fafcfd; }
        .spec-table .val-highlight { font-weight: 700; color: var(--brand-dark); font-size: 16px; }

        /* 兼容性列表 */
        .compat-group { margin-bottom: 14px; display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
        .compat-group .compat-series { font-weight: 700; font-size: 14px; color: #111; min-width: 80px; white-space: nowrap; }
        .compat-group .compat-models { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
        .compat-group .compat-models a { color: var(--brand); text-decoration: none; }
        .compat-group .compat-models a:hover { text-decoration: underline; }
        .compat-incompatible { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border-light); }
        .compat-incompatible .compat-series { color: var(--text-muted); }
        .compat-incompatible .compat-models { color: var(--text-muted); }
        .compat-notes { margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border-light); font-size: 13px; color: var(--text-muted); line-height: 1.8; }

        /* 选型指引 */
        .cross-series-note { background: var(--brand-ghost); border: 1px solid var(--brand-light); border-radius: var(--radius-sm); padding: 16px 20px; font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
        .cross-series-note a { color: var(--brand); font-weight: 600; text-decoration: none; }
        .cross-series-note a:hover { text-decoration: underline; }

        /* 内容区咨询按钮 */
        .cta-inline { display: flex; align-items: center; justify-content: center; margin-top: 28px; }
        .btn-outline { display: inline-flex; align-items: center; padding: 12px 28px; border: 2px solid var(--brand); color: var(--brand); background: var(--white); border-radius: 6px; text-decoration: none; font-weight: 600; font-size: 14px; transition: var(--transition); letter-spacing: 0.3px; }
        .btn-outline:hover { background: var(--brand); color: #fff; box-shadow: 0 4px 12px rgba(26,111,181,0.2); transform: translateY(-1px); }

        /* 流程步骤 */
        .flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 16px; }
        @media (max-width: 960px) { .flow-steps { grid-template-columns: 1fr 1fr; } }
        @media (max-width: 480px) { .flow-steps { grid-template-columns: 1fr; } }
        .flow-step { text-align: center; padding: 24px 16px; background: var(--white); border-radius: var(--radius); border: 1px solid var(--border-light); transition: var(--transition); }
        .flow-step:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
        .flow-step .step-num { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: var(--brand); color: #fff; border-radius: 50%; font-size: 15px; font-weight: 700; margin-bottom: 10px; box-shadow: 0 2px 8px rgba(26,111,181,0.3); }
        .flow-step .step-title { font-size: 14px; font-weight: 600; color: #111; margin-bottom: 4px; }
        .flow-step .step-desc { font-size: 12px; color: var(--text-muted); line-height: 1.5; }

        /* 交付清单 */
        .delivery-list { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 12px; }
        .delivery-item { padding: 12px 20px; background: var(--bg); border-radius: var(--radius-sm); font-size: 14px; color: var(--text-secondary); border: 1px solid var(--border-light); display: flex; align-items: center; gap: 8px; }
        .delivery-item .check { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; background: #e6f4ea; color: #1a8c4a; border-radius: 50%; font-size: 13px; font-weight: 700; flex-shrink: 0; }

        /* FAQ */
        .faq-item { padding: 20px 0; border-bottom: 1px solid var(--border-light); }
        .faq-item:last-child { border-bottom: none; }
        .faq-q { font-weight: 600; color: #111; font-size: 15px; margin-bottom: 6px; }
        .faq-a { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

        /* CTA区域 */
        .cta-wrapper { margin-bottom: 20px; }
        .cta-card { background: linear-gradient(135deg, #1a6fb5 0%, #145a8c 100%); border-radius: var(--radius); padding: 44px 48px; text-align: center; box-shadow: var(--shadow-lg); position: relative; overflow: hidden; }
        .cta-card::before { content: ''; position: absolute; top: -50%; right: -20%; width: 300px; height: 300px; background: rgba(255,255,255,0.03); border-radius: 50%; pointer-events: none; }
        .cta-card .cta-title { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 10px; position: relative; }
        .cta-card .cta-phone { font-size: 36px; font-weight: 800; color: #fff; letter-spacing: 1px; margin: 12px 0; position: relative; text-shadow: 0 2px 8px rgba(0,0,0,0.2); }
        .cta-card .cta-sub { font-size: 14px; color: rgba(255,255,255,0.8); margin-bottom: 20px; position: relative; }
        .cta-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; }
        .cta-btn { display: inline-block; padding: 14px 32px; border-radius: 6px; text-decoration: none; font-weight: 700; font-size: 15px; transition: var(--transition); letter-spacing: 0.3px; }
        .cta-btn--primary { background: #fff; color: var(--brand-dark); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
        .cta-btn--primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.25); background: #f0f6fc; }
        .cta-btn--ghost { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.5); }
        .cta-btn--ghost:hover { background: rgba(255,255,255,0.1); border-color: #fff; transform: translateY(-2px); }
        .cta-links { margin-top: 20px; display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; position: relative; }
        .cta-links a { color: rgba(255,255,255,0.85); text-decoration: none; font-size: 14px; font-weight: 500; transition: var(--transition); }
        .cta-links a:hover { color: #fff; text-decoration: underline; }

        /* 底部 */
        .site-footer { text-align: center; padding: 32px; font-size: 12px; color: var(--text-muted); line-height: 1.8; background: var(--white); border-top: 1px solid var(--border); }
        .site-footer a { color: var(--text-muted); text-decoration: none; }
        .site-footer a:hover { color: var(--text-secondary); }

        /* 移动端底部固定电话 */
        .mobile-fixed-phone { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 99; background: var(--white); border-top: 1px solid var(--border); padding: 10px 16px; box-shadow: 0 -2px 8px rgba(0,0,0,0.06); }
        .mobile-fixed-phone a { display: flex; align-items: center; justify-content: center; background: var(--cta); color: #fff; padding: 12px 20px; border-radius: 6px; text-decoration: none; font-weight: 600; font-size: 15px; letter-spacing: 0.3px; }
        .mobile-fixed-phone a:hover { background: var(--cta-hover); }

        /* ========== 移动端适配 ========== */
        @media (max-width: 768px) {
            /* 统一左右边距 */
            .main-wrap { padding: 0 16px; }
            .model-switcher-wrap { padding: 0 16px; }
            .breadcrumb { padding: 10px 16px; }
            
            /* 卡片内边距缩小 */
            .card { padding: 28px 20px; }
            
            /* 顶部栏 */
            .top-bar { height: 52px; }
            .top-bar-inner { padding: 0 16px; }
            .top-bar .logo img { height: 28px; }
            
            /* 隐藏导航菜单和顶部电话 */
            .top-bar .nav-group nav { display: none !important; }
            .top-bar .header-phone { display: none !important; }
            
            /* 型号切换器样式调整 */
            .model-switcher {
                padding: 10px 16px;
                width: 100%;
                box-sizing: border-box;
            }
            .model-switcher a { padding: 6px 12px; font-size: 12px; }
            
            /* 表格滚动 */
            .spec-table { display: block; overflow-x: auto; white-space: nowrap; }
            
            /* 标题字体缩小 */
            h1 { font-size: 26px; }
            h2 { font-size: 20px; }
            
            /* CTA 区域 */
            .cta-card { padding: 28px 20px; }
            .cta-card .cta-phone { font-size: 26px; }
            
            /* 底部固定电话显示 */
            .mobile-fixed-phone { display: block; }
            .main-wrap { padding-bottom: 80px; }
            
            /* 兼容性列表移动端优化 */
            .compat-group { flex-direction: column; align-items: flex-start; gap: 4px; }
            .compat-series { margin-bottom: 4px; }
            
            /* hero 区域移动端居中 */
            .hero-grid { text-align: center; }
            .subtitle { margin-left: auto; margin-right: auto; }
            .tech-tags { justify-content: center; }
        }
        
        @media (max-width: 480px) {
            .model-switcher { gap: 8px; }
            .model-switcher a { padding: 5px 10px; font-size: 11px; }
            .flow-steps { gap: 12px; }
            .flow-step { padding: 16px 12px; }
            .delivery-item { padding: 8px 12px; font-size: 12px; }
            .tech-tag { padding: 5px 12px; font-size: 11px; }
        }