:root {
            --color-primary: #00a8ff;
            --color-accent: #FF6600;
            --color-success: #00c896;
            --color-dark: #0a1628;
            --color-dark2: #1a2a4a;
            --color-bg: #f8fafc;
            --color-border: #edf2f7;
            --radius-sm: 8px;
            --radius-md: 12px;
            --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 8px 36px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        /* ===== 共享 ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--color-bg); }
        .section-title { text-align: center; margin-bottom: 3rem; }
        .section-title h3 { font-weight: 700; font-size: 2rem; color: var(--color-dark2); margin-bottom: 0.5rem; }
        .section-title h3 span { color: var(--color-primary); }
        .section-title .subtitle { color: #888; font-size: 1rem; max-width: 650px; margin: 0 auto; }
        .gradient-text {
            background: linear-gradient(135deg, var(--color-primary), var(--color-success));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
        }
        .highlight-box {
            margin-top: 24px; padding: 20px 24px; border-radius: var(--radius-sm);
            border-left: 4px solid var(--color-primary); background: #f0f7ff;
            font-size: 0.92rem; color: #555; line-height: 1.8;
        }

        /* ===== 1. Banner ===== */
        .banner {
            background: linear-gradient(160deg, #080f1f 0%, #0f1f3d 40%, #0a1832 100%);
            position: relative; overflow: hidden; min-height: 520px;
            display: flex; align-items: center;
        }
        .banner::before {
            content: ''; position: absolute; inset: 0;
            background: 
                radial-gradient(ellipse 800px 400px at 20% 50%, rgba(0,168,255,0.06) 0%, transparent 60%),
                radial-gradient(ellipse 600px 300px at 75% 30%, rgba(0,200,150,0.04) 0%, transparent 60%),
                radial-gradient(ellipse 500px 350px at 50% 80%, rgba(255,102,0,0.03) 0%, transparent 50%);
        }
        .banner::after {
            content: ''; position: absolute; inset: 0;
            background-image: 
                linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
            background-size: 60px 60px;
            mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
        }
        .banner .container { position: relative; z-index: 1; }
        .banner-content { text-align: center; padding: 100px 0 80px; color: #fff; }
        .banner-badge {
            display: inline-block; border-radius: 20px; padding: 6px 20px;
            background: rgba(0,168,255,0.12); border: 1px solid rgba(0,168,255,0.2);
            color: #5cb8ff; font-size: 0.88rem; margin-bottom: 1.5rem; letter-spacing: 0.5px;
        }
        .banner-content h2 {
            font-size: 2.8rem; font-weight: 800; line-height: 1.4; margin-bottom: 1.2rem;
            background: linear-gradient(135deg, #4db8ff 0%, #5ce0c0 100%);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
        }
        .banner-content .lead {
            font-size: 1.1rem; color: rgba(255,255,255,0.7); max-width: 780px;
            margin: 0 auto 2rem; line-height: 1.9;
        }
        .banner-stats { display: flex; justify-content: center; gap: 48px; margin-top: 2rem; flex-wrap: wrap; }
        .banner-stat { text-align: center; }
        .banner-stat .num { font-size: 2rem; font-weight: 800; color: var(--color-primary); }
        .banner-stat .lbl { font-size: 0.82rem; color: rgba(255,255,255,0.5); margin-top: 2px; }

        /* ===== 2. 痛点 ===== */
        .pain-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
        .pain-card {
            background: #fff; border-radius: var(--radius-md); padding: 28px 24px;
            border: 1px solid var(--color-border); transition: var(--transition);
            display: flex; gap: 16px; align-items: flex-start;
        }
        .pain-card:hover { border-color: #fecaca; box-shadow: 0 6px 24px rgba(239,68,68,0.06); }
        .pain-card .pain-icon {
            width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
            background: #fef2f2; color: #ef4444; display: flex; align-items: center;
            justify-content: center; font-size: 1.2rem;
        }
        .pain-card h5 { font-weight: 700; font-size: 0.98rem; margin-bottom: 0.3rem; color: #1a1a2e; }
        .pain-card p { color: #888; font-size: 0.88rem; line-height: 1.65; margin: 0; }

        /* ===== 3. 双引擎 ===== */
        .engine-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 28px; }
        .engine-card {
            background: #fff; border-radius: var(--radius-md); padding: 40px 32px;
            box-shadow: var(--shadow-card); transition: var(--transition);
            position: relative; overflow: hidden;
        }
        .engine-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .engine-card.niu { border-top: 4px solid var(--color-accent); }
        .engine-card.ct  { border-top: 4px solid var(--color-primary); }
        .engine-card .eng-icon {
            width: 56px; height: 56px; border-radius: 14px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.5rem; margin-bottom: 1.2rem;
        }
        .engine-card.niu .eng-icon { background: rgba(255,102,0,0.1); color: var(--color-accent); }
        .engine-card.ct  .eng-icon { background: rgba(0,168,255,0.1); color: var(--color-primary); }
        .engine-card h4 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.7rem; }
        .engine-card .desc { color: #666; line-height: 1.8; font-size: 0.93rem; margin-bottom: 1.2rem; }
        .engine-features { list-style: none; padding: 0; margin: 0; }
        .engine-features li {
            padding: 5px 0 5px 26px; position: relative; color: #555; font-size: 0.9rem; line-height: 1.6;
        }
        .engine-features li::before {
            content: ''; position: absolute; left: 0; top: 12px;
            width: 14px; height: 2px; border-radius: 2px;
        }
        .niu .engine-features li::before { background: var(--color-accent); }
        .ct  .engine-features li::before { background: var(--color-primary); }
        .engine-link {
            display: inline-block; margin-top: 1.2rem; font-weight: 600; font-size: 0.9rem;
            text-decoration: none; transition: var(--transition);
        }
        .engine-link:hover { opacity: 0.8; }
        .engine-link.niu { color: var(--color-accent); }
        .engine-link.ct  { color: var(--color-primary); }

        /* ===== 4. 架构 ===== */
        .arch-flow { display: flex; justify-content: center; align-items: stretch; flex-wrap: wrap; gap: 0; margin-top: 2rem; }
        .arch-item { display: flex; align-items: center; }
        .arch-node {
            background: #fff; border: 2px solid #e0e7ef; border-radius: var(--radius-md);
            padding: 18px 22px; text-align: center; min-width: 110px; transition: var(--transition);
        }
        .arch-node:hover { border-color: var(--color-primary); box-shadow: 0 4px 16px rgba(0,168,255,0.1); }
        .arch-node .an-icon { font-size: 1.5rem; margin-bottom: 4px; }
        .arch-node .an-title { font-weight: 700; font-size: 0.92rem; color: var(--color-dark2); }
        .arch-node .an-sub { font-size: 0.75rem; color: #aaa; margin-top: 2px; }
        .arch-connector {
            width: 36px; height: 2px; background: linear-gradient(90deg, var(--color-primary), var(--color-success));
            margin: 0 4px; border-radius: 2px; flex-shrink: 0;
        }
        .arch-connector::after {
            content: ''; display: block; width: 8px; height: 8px;
            border-top: 2px solid var(--color-success); border-right: 2px solid var(--color-success);
            transform: translate(26px, -5px) rotate(45deg);
        }

        /* ===== 5. 核心能力 ===== */
        .cap-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
        .cap-card {
            background: #fff; border-radius: var(--radius-md); padding: 32px 28px;
            border: 1px solid var(--color-border); transition: var(--transition); height: 100%;
        }
        .cap-card:hover { border-color: var(--color-primary); box-shadow: 0 6px 24px rgba(0,168,255,0.06); }
        .cap-card .cap-num {
            font-size: 2.8rem; font-weight: 800; line-height: 1; margin-bottom: 0.5rem;
            background: linear-gradient(135deg, var(--color-primary), var(--color-success));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
        }
        .cap-card h5 { font-weight: 700; font-size: 1.05rem; margin-bottom: 0.5rem; color: var(--color-dark2); }
        .cap-card p { color: #777; font-size: 0.9rem; line-height: 1.75; margin: 0; }

        /* ===== 6. 订单管理 ===== */
        .order-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
        .order-card {
            background: #fff; border-radius: var(--radius-md); padding: 30px 26px;
            border: 1px solid var(--color-border); transition: var(--transition); height: 100%;
        }
        .order-card:hover { border-color: var(--color-primary); box-shadow: 0 6px 24px rgba(0,168,255,0.06); }
        .order-card .oc-icon {
            width: 48px; height: 48px; border-radius: 10px; display: flex; align-items: center;
            justify-content: center; font-size: 1.3rem; margin-bottom: 1rem;
        }
        .order-card h5 { font-weight: 700; font-size: 1.02rem; margin-bottom: 0.5rem; }
        .order-card p { color: #777; font-size: 0.9rem; line-height: 1.75; margin: 0; }

        .upload-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 18px; margin-top: 28px; }
        .upload-item {
            background: #f8fbff; border: 2px dashed #d0ddef; border-radius: var(--radius-md);
            padding: 24px 16px; text-align: center; transition: var(--transition);
        }
        .upload-item:hover { border-color: var(--color-primary); background: #f0f7ff; transform: translateY(-2px); }
        .upload-item .ui-icon { font-size: 2rem; margin-bottom: 0.6rem; }
        .upload-item h6 { font-weight: 700; font-size: 0.9rem; margin-bottom: 0.3rem; }
        .upload-item span { font-size: 0.77rem; color: #999; line-height: 1.6; }
        .badge-status { padding: 3px 12px; border-radius: 12px; font-size: 0.8rem; font-weight: 600; }
        .badge-pending { background: #fff3e0; color: #e65100; }
        .badge-shipping { background: #e3f2fd; color: #0d47a1; }
        .badge-done { background: #e8f5e9; color: #1b5e20; }
        /* ===== 7. 统计 ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 18px; margin-top: 2rem; }
        .stat-card {
            background: #fff; border-radius: var(--radius-md); padding: 24px 18px; text-align: center;
            border: 1px solid var(--color-border); transition: var(--transition);
        }
        .stat-card:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,168,255,0.06); }
        .stat-card .stat-value {
            font-size: 1.5rem; font-weight: 800; margin-bottom: 0.2rem; letter-spacing: 2px;
            background: linear-gradient(135deg, var(--color-dark2), var(--color-primary));
            -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
        }
        .stat-card .stat-label { color: #666; font-size: 0.88rem; font-weight: 600; }
        .stat-card .stat-unit { font-size: 0.78rem; color: #bbb; margin-top: 2px; }

        .dash-preview {
            background: #fff; border-radius: var(--radius-md); border: 1px solid var(--color-border);
            overflow: hidden; box-shadow: var(--shadow-card);
        }
        .dash-preview .dp-header {
            background: var(--color-dark2); color: #fff; padding: 16px 24px;
            font-weight: 700; font-size: 1.05rem; letter-spacing: 0.5px;
        }
        .dp-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
        .dp-cell {
            padding: 22px 16px; text-align: center;
            border-right: 1px solid #f0f4f8; border-bottom: 1px solid #f0f4f8;
        }
        .dp-cell .dp-num { font-size: 1.5rem; font-weight: 800; color: var(--color-dark2); letter-spacing: 2px; }
        .dp-cell .dp-desc { font-size: 0.8rem; color: #999; margin-top: 4px; }

        .report-list { list-style: none; padding: 0; margin: 0; }
        .report-list li {
            padding: 13px 16px; border-bottom: 1px solid #f0f4f8; display: flex;
            align-items: flex-start; gap: 12px; font-size: 0.88rem; line-height: 1.6; transition: var(--transition);
        }
        .report-list li:last-child { border-bottom: none; }
        .report-list li:hover { background: #f8fbff; }
        .report-list .ri-icon {
            width: 36px; height: 36px; border-radius: 8px; flex-shrink: 0;
            display: flex; align-items: center; justify-content: center; font-size: 0.95rem;
        }
        .ri-blue  { background: #e3f2fd; color: #1565c0; }
        .ri-green { background: #e8f5e9; color: #2e7d32; }
        .ri-orange{ background: #fff3e0; color: #e65100; }
        .ri-purple{ background: #f3e5f5; color: #7b1fa2; }

        /* ===== 8. 适用场景 ===== */
        .scene-table { width: 100%; border-collapse: separate; border-spacing: 0; margin-top: 1.5rem; }
        .scene-table th {
            background: var(--color-dark2); color: #fff; padding: 14px 18px;
            font-weight: 600; font-size: 0.93rem; text-align: left;
        }
        .scene-table th:first-child { border-radius: var(--radius-sm) 0 0 0; }
        .scene-table th:last-child { border-radius: 0 var(--radius-sm) 0 0; }
        .scene-table td {
            padding: 14px 18px; border-bottom: 1px solid var(--color-border);
            vertical-align: top; font-size: 0.9rem; line-height: 1.7; background: #fff;
        }
        .scene-table tr:last-child td:first-child { border-radius: 0 0 0 var(--radius-sm); }
        .scene-table tr:last-child td:last-child { border-radius: 0 0 var(--radius-sm) 0; }
        .scene-table tr:hover td { background: #f5faff; }
        .scene-label {
            display: inline-block; background: #e8f4fd; color: #0077cc;
            border-radius: 4px; padding: 3px 12px; font-size: 0.8rem; font-weight: 600;
        }

        /* ===== 9. 价值 ===== */
        .value-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
        .value-card {
            background: linear-gradient(135deg, #f8faff, #f0f7ff); border-radius: var(--radius-md);
            padding: 36px 28px; text-align: center; border: 1px solid #e0eaf5;
            transition: var(--transition); height: 100%;
        }
        .value-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,100,200,0.07); }
        .value-card .vc-icon {
            width: 62px; height: 62px; margin: 0 auto 1rem; border-radius: 50%;
            display: flex; align-items: center; justify-content: center; font-size: 1.5rem;
        }
        .value-card h5 { font-weight: 700; margin-bottom: 0.6rem; }
        .value-card p { color: #666; font-size: 0.9rem; line-height: 1.8; margin: 0; }

        /* ===== 10. 生态 ===== */
        .eco-row { display: flex; justify-content: center; align-items: stretch; flex-wrap: wrap; gap: 0; margin-top: 2rem; }
        .eco-node {
            background: #fff; border: 1px solid #e0e7ef; border-radius: var(--radius-md);
            padding: 20px 16px; text-align: center; transition: var(--transition); width: 150px;
        }
        .eco-node:hover { border-color: var(--color-primary); }
        .eco-node.current { border: 2px solid var(--color-primary); box-shadow: 0 4px 20px rgba(0,168,255,0.1); }
        .eco-node .en-icon { font-size: 1.3rem; margin-bottom: 6px; }
        .eco-node h6 { font-weight: 700; font-size: 0.9rem; margin-bottom: 3px; }
        .eco-node p { font-size: 0.76rem; color: #999; margin: 0; line-height: 1.5; }
        .eco-arrow {
            display: flex; align-items: center; justify-content: center; width: 30px;
            color: var(--color-primary); font-size: 1.2rem; flex-shrink: 0;
        }

        /* ===== 11. 联系 ===== */
        .contact-section {
            background: linear-gradient(135deg, var(--color-dark), var(--color-dark2));
            color: #fff; padding: 70px 0;
        }
        .contact-section h3 { font-weight: 700; margin-bottom: 1rem; }
        .contact-section p { color: rgba(255,255,255,0.7); line-height: 1.8; font-size: 0.95rem; }
        .contact-links a { color: rgba(255,255,255,0.6); text-decoration: none; transition: var(--transition); }
        .contact-links a:hover { color: #fff; }
        .contact-links a.link-niu { color: var(--color-accent); }
        .contact-links a.link-ct  { color: var(--color-primary); }

        /* ===== 页内导航 ===== */
        .page-nav {
            position: sticky; top: 70px; z-index: 99; background: #fff;
            border-bottom: 1px solid var(--color-border); padding: 0;
        }
        .page-nav .nav-list {
            display: flex; list-style: none; padding: 0; margin: 0;
            overflow-x: auto; -webkit-overflow-scrolling: touch;
        }
        .page-nav .nav-list::-webkit-scrollbar { display: none; }
        .page-nav .nav-list li { flex-shrink: 0; }
        .page-nav .nav-list a {
            display: block; padding: 12px 18px; font-size: 0.85rem; color: #888;
            text-decoration: none; border-bottom: 2px solid transparent; transition: var(--transition);
            white-space: nowrap;
        }
        .page-nav .nav-list a:hover,
        .page-nav .nav-list a.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

        /* ===== 响应式 ===== */
        @media (max-width: 991px) {
            .banner-content h2 { font-size: 2rem; }
            .arch-flow { flex-direction: column; align-items: center; gap: 0; }
            .arch-connector {
                width: 2px; height: 24px; margin: 0;
            }
            .arch-connector::after {
                border: none; border-left: 2px solid var(--color-success);
                border-bottom: 2px solid var(--color-success);
                width: 8px; height: 8px; transform: translate(-3px, 14px) rotate(-45deg);
            }
            .eco-row { flex-direction: column; align-items: center; }
            .eco-arrow { transform: rotate(90deg); }
            .eco-node { width: 100%; max-width: 250px; }
            .engine-row { grid-template-columns: 1fr; }
            .banner-stats { gap: 24px; }
            .section { padding: 50px 0; }
        }
        @media (max-width: 768px) {
            .banner-content h2 { font-size: 1.6rem; }
            .banner-content .lead { font-size: 0.9rem; }
            .banner-stats .num { font-size: 1.4rem; }
            .dp-grid { grid-template-columns: repeat(2, 1fr); }
            .section-title h3 { font-size: 1.5rem; }
        }
/* ===== 页内导航 ===== */
.page-nav {
    position: sticky; top: 70px; z-index: 100;
    background: rgba(255,255,255,0.95); backdrop-filter: blur(10px);
    border-bottom: 1px solid #edf2f7; padding: 0;
}
.page-nav .nav-list {
    display: flex; list-style: none; margin: 0; padding: 0;
    overflow-x: auto; white-space: nowrap;
}
.page-nav .nav-list li { flex-shrink: 0; }
.page-nav .nav-list a {
    display: block; padding: 14px 20px; font-size: 0.88rem;
    font-weight: 600; color: #666; text-decoration: none;
    border-bottom: 2px solid transparent; transition: all 0.25s;
}
.page-nav .nav-list a:hover,
.page-nav .nav-list a.active {
    color: var(--color-primary); border-bottom-color: var(--color-primary);
}
.contact-section {
    background: linear-gradient(160deg, #080f1f 0%, #0f1f3d 40%, #0a1832 100%);
    padding: 80px 0; color: rgba(255,255,255,0.8); position: relative; overflow: hidden;
}
.contact-section::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(ellipse 600px 300px at 80% 50%, rgba(0,168,255,0.08) 0%, transparent 60%);
}
.contact-section h3 { color: #fff; font-size: 2rem; font-weight: 700; margin-bottom: 0.8rem; }
.contact-section p { font-size: 1rem; line-height: 1.8; max-width: 600px; }
.link-niu { color: var(--color-accent); text-decoration: none; }
.link-niu:hover { text-decoration: underline; }
.link-ct  { color: var(--color-primary); text-decoration: none; }
.link-ct:hover { text-decoration: underline; }
/* ===== 延伸生态 ===== */
.eco-row {
    display: flex; justify-content: center; align-items: center;
    flex-wrap: wrap; gap: 8px; margin-top: 2rem;
}
.eco-node {
    text-align: center; padding: 20px 24px; border-radius: var(--radius-md);
    background: #fff; border: 1px solid var(--color-border); min-width: 130px;
    transition: var(--transition);
}
.eco-node:hover { border-color: var(--color-primary); transform: translateY(-3px); }
.eco-node.current { border-color: var(--color-primary); box-shadow: 0 4px 20px rgba(0,168,255,0.1); }
.eco-node .en-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.eco-node h6 { font-weight: 700; font-size: 0.9rem; margin-bottom: 0.3rem; }
.eco-node p { font-size: 0.78rem; color: #999; line-height: 1.5; margin: 0; }
.eco-arrow { font-size: 1.2rem; color: #ccc; font-weight: 700; }
/* ===== 客户价值 ===== */
.value-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.value-card {
    background: #fff; border-radius: var(--radius-md); padding: 30px 26px;
    border: 1px solid var(--color-border); transition: var(--transition); height: 100%;
}
.value-card:hover { transform: translateY(-3px); box-shadow: 0 6px 24px rgba(0,168,255,0.06); }
.value-card .vc-icon {
    width: 48px; height: 48px; border-radius: 10px; display: flex; align-items: center;
    justify-content: center; font-size: 1.3rem; margin-bottom: 0.8rem;
}
.value-card h5 { font-weight: 700; font-size: 1.02rem; margin-bottom: 0.5rem; }
.value-card p { color: #777; font-size: 0.9rem; line-height: 1.75; margin: 0; }