*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        /* 不使用 :root 变量，所有值直接定义 */
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: #2c2c2c;
            background-color: #f7f8fa;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* ===== 外层壳体 ===== */
        .xn_shell {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== 面包屑导航 ===== */
        .xn_crumbtrail {
            padding: 18px 0 10px;
            font-size: 14px;
            color: #6b7280;
            letter-spacing: 0.3px;
        }
        .xn_crumbtrail a {
            color: #1e4f7a;
            text-decoration: none;
            transition: color 0.2s;
        }
        .xn_crumbtrail a:hover {
            color: #0a2f4d;
            text-decoration: underline;
        }
        .xn_crumbtrail .xn_crumbsep {
            margin: 0 8px;
            color: #b0b8c1;
            user-select: none;
        }
        .xn_crumbtrail .xn_crumbcur {
            color: #374151;
            font-weight: 500;
        }

        /* ===== Banner 图区（长方形，栏目缩略图位置） ===== */
        .xn_heroframe {
            width: 100%;
            aspect-ratio: 2.0 / 1;
            /* 长方形banner比例，可替换图片 */
            overflow: hidden;
            border-radius: 6px;
            background-color: #e5e7eb;
            position: relative;
            margin-bottom: 28px;
            border: 1px solid #e0e3e8;
        }
        .xn_heroframe img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        /* 占位提示（替换图片后可删除此层） */
        .xn_heroframe .xn_heroph {
            position: absolute;
            inset: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #dbe1e8;
            color: #6b7b8d;
            font-size: 15px;
            letter-spacing: 1px;
            pointer-events: none;
            z-index: 0;
        }
        .xn_heroframe img {
            position: relative;
            z-index: 1;
        }

        /* ===== 主标题区 H1 ===== */
        .xn_masthead {
            margin-bottom: 10px;
        }
        .xn_masthead h1 {
            font-size: 32px;
            font-weight: 700;
            color: #0f263b;
            letter-spacing: 0.5px;
            line-height: 1.35;
            margin-bottom: 8px;
        }
        .xn_masthead .xn_sublead {
            font-size: 16px;
            color: #4b5563;
            line-height: 1.6;
            max-width: 860px;
        }

        /* ===== 通用区块 ===== */
        .xn_chillblock {
            background: #ffffff;
            border-radius: 6px;
            padding: 36px 32px;
            margin-bottom: 24px;
            border: 1px solid #e7eaef;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
        }
        .xn_chillblock .xn_blocktit {
            font-size: 22px;
            font-weight: 700;
            color: #0f263b;
            margin-bottom: 18px;
            padding-left: 14px;
            border-left: 4px solid #1a6daa;
            letter-spacing: 0.4px;
        }
        .xn_chillblock .xn_blocktit_sm {
            font-size: 18px;
            font-weight: 700;
            color: #1a3a52;
            margin-bottom: 12px;
        }

        /* ===== 痛点卡片网格 ===== */
        .xn_paingrid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 20px;
            margin-top: 8px;
        }
        .xn_paincard {
            background: #fafbfc;
            border: 1px solid #e9ecf1;
            border-radius: 6px;
            padding: 22px 18px;
            transition: border-color 0.25s, box-shadow 0.25s;
        }
        .xn_paincard:hover {
            border-color: #c4d4e2;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
        }
        .xn_paincard .xn_painicon {
            font-size: 28px;
            margin-bottom: 8px;
            display: block;
        }
        .xn_paincard .xn_painhead {
            font-weight: 700;
            font-size: 16px;
            color: #1a3a52;
            margin-bottom: 6px;
        }
        .xn_paincard .xn_paindesc {
            font-size: 14px;
            color: #4b5563;
            line-height: 1.6;
        }

        /* ===== 适用对象 ===== */
        .xn_userbadges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 6px;
        }
        .xn_userbadge {
            background: #eef5fa;
            color: #1a4f6e;
            padding: 8px 18px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        /* ===== 参数规格表 ===== */
        .xn_frostspec {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
            font-size: 14px;
        }
        .xn_frostspec thead th {
            background: #f0f4f8;
            color: #0f263b;
            font-weight: 700;
            padding: 14px 12px;
            text-align: left;
            border-bottom: 2px solid #d0dae4;
            font-size: 13px;
            letter-spacing: 0.4px;
            text-transform: uppercase;
        }
        .xn_frostspec tbody td {
            padding: 12px;
            border-bottom: 1px solid #eef1f5;
            color: #374151;
            vertical-align: top;
        }
        .xn_frostspec tbody tr:hover {
            background: #fafcfd;
        }
        .xn_frostspec .xn_specnote {
            font-size: 12px;
            color: #8b919d;
            display: block;
            margin-top: 3px;
        }
        /* 透明化提示 */
        .xn_transparenote {
            background: #fffdf5;
            border: 1px solid #f0e8c8;
            border-radius: 5px;
            padding: 14px 18px;
            margin-top: 16px;
            font-size: 13px;
            color: #6b5e2f;
            line-height: 1.7;
        }
        .xn_transparenote strong {
            color: #4a3a10;
        }

        /* ===== 核心优势 ===== */
        .xn_advgrid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
            margin-top: 6px;
        }
        .xn_advcard {
            padding: 20px 18px;
            border-radius: 6px;
            background: #f9fbfd;
            border: 1px solid #e3e9f0;
            position: relative;
        }
        .xn_advcard .xn_advnum {
            position: absolute;
            top: -12px;
            left: 16px;
            background: #1a6daa;
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .xn_advcard .xn_advhead {
            font-weight: 700;
            font-size: 16px;
            color: #0f263b;
            margin-top: 6px;
            margin-bottom: 6px;
        }
        .xn_advcard .xn_advdesc {
            font-size: 14px;
            color: #4b5563;
            line-height: 1.6;
        }

        /* ===== 资质矩阵 ===== */
        .xn_trustgrid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 14px;
            margin-top: 8px;
        }
        .xn_trustseal {
            background: #f6f8fa;
            border: 1px solid #e3e8ed;
            border-radius: 5px;
            padding: 16px 14px;
            font-size: 14px;
            color: #1a3a52;
            line-height: 1.5;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .xn_trustseal .xn_sealmark {
            flex-shrink: 0;
            font-size: 20px;
            color: #1a6daa;
            margin-top: 1px;
        }
        .xn_trustseal .xn_sealtxt strong {
            display: block;
            font-size: 15px;
            color: #0f263b;
            margin-bottom: 2px;
        }

        /* ===== 服务流程 ===== */
        .xn_iceflow {
            display: flex;
            flex-wrap: wrap;
            gap: 0;
            margin-top: 10px;
            counter-reset: xnstep;
        }
        .xn_icestep {
            flex: 1 1 180px;
            min-width: 150px;
            text-align: center;
            padding: 18px 10px;
            position: relative;
            counter-increment: xnstep;
        }
        .xn_icestep::after {
            content: '';
            position: absolute;
            right: 0;
            top: 28px;
            width: 1px;
            height: 40px;
            background: #dce3ea;
        }
        .xn_icestep:last-child::after {
            display: none;
        }
        .xn_icestep .xn_stepcircle {
            display: inline-block;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #1a6daa;
            color: #fff;
            line-height: 44px;
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 10px;
        }
        .xn_icestep .xn_steptit {
            font-weight: 700;
            font-size: 15px;
            color: #0f263b;
            margin-bottom: 4px;
        }
        .xn_icestep .xn_stepdesc {
            font-size: 13px;
            color: #5f6b7a;
            line-height: 1.5;
        }

        /* ===== 报价说明 ===== */
        .xn_quotebox {
            background: #fcfdfe;
            border: 1px solid #e3e9f0;
            border-radius: 6px;
            padding: 24px 22px;
            margin-top: 8px;
        }
        .xn_quotebox .xn_quotelist {
            list-style: none;
            padding: 0;
        }
        .xn_quotebox .xn_quotelist li {
            padding: 8px 0;
            border-bottom: 1px dotted #e8ecf1;
            font-size: 14px;
            color: #374151;
            display: flex;
            align-items: baseline;
            gap: 8px;
        }
        .xn_quotebox .xn_quotelist li::before {
            content: '▸';
            color: #1a6daa;
            flex-shrink: 0;
        }
        .xn_quotebox .xn_quotelist li:last-child {
            border-bottom: none;
        }

        /* ===== 材料配套说明 ===== */
        .xn_matenote {
            font-size: 14px;
            color: #4b5563;
            line-height: 1.8;
            margin-top: 6px;
        }
        .xn_matenote .xn_matebrand {
            display: inline-block;
            background: #eef5fa;
            color: #1a4f6e;
            padding: 2px 10px;
            border-radius: 3px;
            font-weight: 500;
            margin: 0 2px;
            font-size: 13px;
        }

        /* ===== FAQ区域 ===== */
        .xn_faqlist {
            margin-top: 6px;
        }
        .xn_faqitem {
            border-bottom: 1px solid #eef1f5;
            padding: 16px 0;
        }
        .xn_faqitem:last-child {
            border-bottom: none;
        }
        .xn_faqitem .xn_faqq {
            font-weight: 700;
            font-size: 15px;
            color: #0f263b;
            cursor: default;
            margin-bottom: 4px;
            padding-left: 20px;
            position: relative;
        }
        .xn_faqitem .xn_faqq::before {
            content: 'Q';
            position: absolute;
            left: 0;
            top: 0;
            color: #1a6daa;
            font-weight: 800;
            font-size: 14px;
        }
        .xn_faqitem .xn_faqa {
            font-size: 14px;
            color: #4b5563;
            line-height: 1.7;
            padding-left: 20px;
            position: relative;
        }
        .xn_faqitem .xn_faqa::before {
            content: 'A';
            position: absolute;
            left: 0;
            top: 0;
            color: #4a7c3f;
            font-weight: 800;
            font-size: 14px;
        }

        /* ===== CTA区域 ===== */
        .xn_ctablock {
            background: #0f263b;
            color: #e8edf2;
            border-radius: 6px;
            padding: 30px 28px;
            text-align: center;
            margin-bottom: 24px;
        }
        .xn_ctablock .xn_ctatit {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: 0.5px;
        }
        .xn_ctablock .xn_ctasub {
            font-size: 14px;
            color: #bcc8d4;
            margin-bottom: 16px;
            line-height: 1.6;
        }
        .xn_ctablock .xn_ctabtn {
            display: inline-block;
            background: #e8a830;
            color: #1a1a1a;
            padding: 12px 32px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 15px;
            text-decoration: none;
            letter-spacing: 0.5px;
            transition: background 0.25s;
        }
        .xn_ctablock .xn_ctabtn:hover {
            background: #d4951f;
        }

        /* ===== 响应式适配 ===== */
        @media (max-width: 768px) {
            .xn_shell {
                padding: 0 14px;
            }
            .xn_chillblock {
                padding: 22px 16px;
            }
            .xn_masthead h1 {
                font-size: 24px;
            }
            .xn_heroframe {
                aspect-ratio: 2 / 1;
            }
            .xn_paingrid,
            .xn_advgrid,
            .xn_trustgrid {
                grid-template-columns: 1fr;
            }
            .xn_iceflow {
                flex-direction: column;
                gap: 6px;
            }
            .xn_icestep::after {
                display: none;
            }
            .xn_frostspec {
                font-size: 12px;
            }
            .xn_frostspec thead th,
            .xn_frostspec tbody td {
                padding: 8px 6px;
            }
        }
        @media (max-width: 480px) {
            .xn_heroframe {
                aspect-ratio: 1.6 / 1;
            }
            .xn_masthead h1 {
                font-size: 20px;
            }
            .xn_userbadges {
                gap: 8px;
            }
            .xn_userbadge {
                padding: 6px 12px;
                font-size: 12px;
            }
            .xn_ctablock {
                padding: 20px 16px;
            }
        }