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

        body {
            background-color: #f4f8ff;
            color: #0c1a38;
            line-height: 1.5;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
           
        }
           .sl-banner{
            width: 100%;
            height: 671px;
            background: url(../images/5g.png) no-repeat;
                background-position: 50%;
    background-size: cover;
        }  
        .sl-banCon {
            box-sizing: border-box;
            padding-top: 240px;
        }
        .sl-banCon>h1 {
            font-size: 36px;
            color: #fff;
            font-weight: bold;
        }
        .sl-banCon>p {
            font-size: 22px;
            margin: 30px 0px 50px;
            color: #fff;
               width: 450px;
            line-height: 30px;
        }
        .btn-lg {
            padding: 1rem 2rem;
            font-size: 1.125rem;
            font-weight: 600;
        }
        .btn-primary {
            background: linear-gradient(135deg, #2f54eb 0%, #1d39c4 100%);
            color: #fff;
            box-shadow: 0 4px 16px rgba(47, 84, 235, 0.2);
            border: 1px solid #2f54eb;
        }
        .sl-banCon .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border-radius: 0.5rem;
            text-decoration: none;
            cursor: pointer;
            position: relative;
            overflow: hidden;
            white-space: nowrap;
            user-select: none;
            outline: none;
        }
        /* 延续网格背景，微调为蓝色调 */
        .grid-bg {
            background-image: 
                linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
            background-size: 60px 60px;
        }

        /* 头部 hero 区域 — 突出5G专网 Magic SD-WAN */
        .hero {
            padding: 70px 0 40px 0;
            position: relative;
            overflow: hidden;
        }

        .hero::after {
            content: '';
            position: absolute;
            top: -20%;
            right: -5%;
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(0, 162, 255, 0.07) 0%, rgba(0, 70, 140, 0.02) 70%);
            border-radius: 50%;
            z-index: -1;
        }

        .hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
        }

        .hero-text {
            flex: 1 1 450px;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(0, 102, 255, 0.12);
            color: #0047b3;
            font-weight: 600;
            font-size: 0.85rem;
            letter-spacing: 0.5px;
            padding: 6px 18px;
            border-radius: 40px;
            margin-bottom: 24px;
            border: 1px solid rgba(0, 102, 255, 0.25);
            backdrop-filter: blur(4px);
        }

        .hero h1 {
            font-size: 3.8rem;
            font-weight: 700;
            line-height: 1.1;
            letter-spacing: -1.5px;
            background: linear-gradient(135deg, #002866, #103d8c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 24px;
        }

        .hero .highlight {
            background: linear-gradient(120deg, #0066ff, #4d94ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.2rem;
            color: #2a4070;
            max-width: 620px;
            margin-bottom: 32px;
            border-left: 4px solid #0066ff;
            padding-left: 24px;
            background: rgba(255,255,255,0.5);
            backdrop-filter: blur(4px);
            border-radius: 0 12px 12px 0;
        }

        .hero-stats {
            display: flex;
            gap: 40px;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
        }

        .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: #002866;
        }

        .stat-label {
            font-size: 0.9rem;
            color: #4f6390;
        }

        .hero-visual {
            flex: 1 1 380px;
            background: radial-gradient(circle at 30% 30%, #ffffff, #e1edff);
            border-radius: 40px;
            padding: 20px;
            box-shadow: 0 40px 70px -20px rgba(0,70,150,0.25);
            border: 1px solid rgba(255,255,255,0.7);
            backdrop-filter: blur(8px);
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .fiveg-graphic {
            width: 100%;
            aspect-ratio: 1.2 / 1;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 320" fill="none"><circle cx="200" cy="150" r="70" stroke="%230066ff" stroke-width="3" fill="%23d9ecff" /><text x="170" y="170" fill="%230044aa" font-size="48" font-weight="bold">5G</text><path d="M120 250 L280 250" stroke="%230066ff" stroke-width="2" stroke-dasharray="6 4"/><circle cx="90" cy="230" r="10" fill="%230066ff" opacity="0.5"/><circle cx="310" cy="230" r="10" fill="%230066ff" opacity="0.5"/><text x="30" y="90" fill="%232222aa" font-size="12">N28 700MHz</text><text x="280" y="90" fill="%232222aa" font-size="12">N41 2.6GHz</text></svg>') no-repeat center;
            background-size: contain;
        }

        /* 两个核心概念卡片：双域专网 + 物联专网 */
        .feature-grid-2col {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
            margin: 80px 0 50px;
        }

        .concept-card {
            background: rgba(255,255,255,0.8);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(0,102,255,0.2);
            border-radius: 40px;
            padding: 40px 32px;
            box-shadow: 0 30px 40px -20px #1f56b0;
            transition: all 0.2s;
        }
        .concept-card:hover {
            border-color: #0066ff80;
            background: white;
        }

        .concept-icon {
            background: linear-gradient(145deg, #e3f0ff, white);
            width: 70px; height: 70px; border-radius: 26px;
            display: flex; align-items: center; justify-content: center;
            font-size: 2.4rem; color: #0066ff; margin-bottom: 28px;
            border: 1px solid white; box-shadow: 0 8px 16px -10px #0066ff;
        }

        .concept-card h2 {
            font-size: 2rem; font-weight: 700; letter-spacing: -0.01em; margin-bottom: 24px;
        }
        .concept-card p {
            color: #1d3c70; margin-bottom: 24px; font-size: 1.05rem;
        }

        .spec-list {
            list-style: none;
        }
        .spec-list li {
            padding: 6px 0; border-bottom: 1px solid #e0edff; display: flex; gap: 12px;
            font-weight: 500; color: #00358a;
        }
        .spec-list i {
            color: #0066ff; width: 24px; font-size: 1.2rem;
        }

        /* 频谱 + 覆盖优势卡片 (N28/N41) */
        .spectrum-row {
            display: flex; flex-wrap: wrap; gap: 30px; margin: 50px 0;
        }
        .spectrum-card {
            flex: 1 1 300px; background: #ffffffb8; backdrop-filter: blur(8px);
            border-radius: 36px; padding: 36px 28px; border: 1px solid #b9d6ff;
        }
        .freq-badge {
            background: #0066ff10; border-radius: 40px; padding: 8px 18px;
            font-weight: 600; color: #0044aa; border: 1px solid #0066ff30;
            display: inline-block; margin-bottom: 20px;
        }
        .spectrum-card h3 {
            font-size: 2rem; font-weight: 700; color: #002b70;
        }
        .cmcc-advantage {
            background: #00245e; color: white; border-radius: 48px; padding: 40px;
            margin: 50px 0; display: flex; flex-wrap: wrap; align-items: center; gap: 30px;
            background-image: linear-gradient(125deg, #00245e, #103d7a);
        }
        .advantage-text { flex: 2 1 300px; }
        .advantage-text h4 { font-size: 2rem; margin-bottom: 20px; }
        .advantage-text p { opacity: 0.9; }

        /* 灾备设计区域 (主备UPF/隧道) */
        .redundancy-section {
            background: #ffffffcc; backdrop-filter: blur(8px); border-radius: 56px;
            padding: 50px; margin: 60px 0; border: 1px solid white;
        }
        .redundancy-grid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 30px; margin-top: 30px;
        }
        .redund-item {
            background: #f0f7ff; border-radius: 32px; padding: 28px;
            border: 1px solid #c1dbff;
        }
        .redund-item i { font-size: 2.2rem; color: #0066ff; margin-bottom: 20px; }

        /* 无VPN设计 + 性能对比 (突出测试数据) */
        .novpn-showcase {
            background: #0a1f3f; color: white; border-radius: 70px; padding: 60px 50px;
            margin: 70px 0; background-image: radial-gradient(circle at 70% 40%, #1f4390, #06162e);
        }
        .novpn-flex {
            display: flex; flex-wrap: wrap; gap: 40px; align-items: center;
        }
        .speed-meter {
            background: #ffffff12; backdrop-filter: blur(8px); border-radius: 50px;
            padding: 32px; flex: 1 1 280px; border: 1px solid #5588dd;
        }
        .speed-list {
            list-style: none; margin-top: 20px;
        }
        .speed-list li {
            display: flex; justify-content: space-between; border-bottom: 1px dashed #6384c0;
            padding: 14px 0; font-weight: 500;
        }
        .speed-highlight {
            color: #b3dbff; font-weight: 700; font-size: 1.2rem;
        }

        /* 专网比较表格 (原页面表格) */
        .compare-section {
            background: white; border-radius: 56px; padding: 50px; margin: 70px 0;
            box-shadow: 0 30px 40px -25px #1f56b0;
        }
        .compare-table {
            width: 100%; border-collapse: collapse; margin-top: 30px;
        }
        .compare-table th {
            background: #eef4ff; padding: 18px 16px; text-align: left; font-weight: 600;
            border-radius: 28px 28px 0 0;
        }
        .compare-table td {
            padding: 16px; border-bottom: 1px solid #dde9ff;
        }
        .compare-table tr:last-child td { border-bottom: none; }
        .badge-yes { color: #006633; background: #dfffdf; padding: 4px 12px; border-radius: 30px; }
        .badge-no { color: #993333; background: #ffe3e3; padding: 4px 12px; border-radius: 30px; }

        /* 常见问题卡片区 */
        .faq-grid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(280px,1fr)); gap: 24px; margin: 40px 0;
        }
        .faq-card {
            background: #f4faff; border-radius: 32px; padding: 28px; border: 1px solid #cddfff;
        }
        .faq-card h4 { font-size: 1.3rem; margin-bottom: 12px; color: #003896; }

        .footer-note {
            border-top: 1px solid #99bbff; padding: 30px 0 40px;
            display: flex; justify-content: space-between; color: #2f4680; flex-wrap: wrap;
        }
        @media (max-width:700px){
            .container{padding:0 24px;}
            .hero h1{font-size:2.8rem;}
            .feature-grid-2col{grid-template-columns:1fr;}
        }