:root{
      --bg:#f6f8fc;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5a6784;
      --line:#d9e2f0;
      --brand:#1677ff;
      --brand2:#00b3a4;
      --accent:#ffd24d;
      --shadow:0 16px 40px rgba(28,55,90,.08);
      --radius:22px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,var(--bg2),#fff 26%,var(--bg) 100%);color:var(--text)}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    header{position:sticky;top:0;z-index:50;background:rgba(246,248,252,.88);backdrop-filter:blur(16px);border-bottom:1px solid rgba(217,226,240,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand img{width:42px;height:42px;object-fit:contain}
    .brand strong{display:block;font-size:18px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted);margin-top:3px}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#31405b;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover,.nav-links a:focus{background:#eaf2ff;color:var(--brand)}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;padding:12px 18px;font-weight:700;transition:.25s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f9dff);color:#fff;box-shadow:0 12px 24px rgba(22,119,255,.22)}
    .btn-primary:hover{transform:translateY(-2px)}
    .btn-ghost{background:#fff;color:#20304d;border-color:var(--line)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    .hero{padding:34px 0 20px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:stretch}
    .hero-main,.hero-side,.panel,.card,.faq-item,.review,.article,.formbox,.compare,.pricebox,.timeline,.tagbox{background:var(--card);border:1px solid rgba(217,226,240,.92);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:34px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none}
    .hero-main:before{width:260px;height:260px;background:radial-gradient(circle,rgba(22,119,255,.14),transparent 65%);right:-60px;top:-60px}
    .hero-main:after{width:180px;height:180px;background:radial-gradient(circle,rgba(0,179,164,.12),transparent 65%);left:-40px;bottom:-50px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#eef6ff;color:var(--brand);border:1px solid #d6e8ff;padding:8px 14px;border-radius:999px;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(32px,5vw,52px);line-height:1.08;letter-spacing:-.03em}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .metric{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f9fbff,#eef5ff);border:1px solid #dde8f7}
    .metric b{display:block;font-size:22px}
    .metric span{display:block;margin-top:6px;color:var(--muted);font-size:13px;line-height:1.5}
    .hero-side{padding:18px}
    .side-top{padding:18px;border-radius:18px;background:linear-gradient(135deg,#f3f8ff,#ecfff9);border:1px solid #dae7f6}
    .side-top h2{margin:0 0 8px;font-size:20px}
    .side-top p{margin:0;color:var(--muted);line-height:1.7}
    .mini-list{display:grid;gap:10px;margin-top:14px}
    .mini-item{display:flex;gap:10px;align-items:flex-start;color:#25334f;font-size:14px;line-height:1.6}
    .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));margin-top:6px;flex:0 0 auto}
    .section{padding:18px 0}
    .section h2{margin:0 0 12px;font-size:28px;line-height:1.15}
    .section p.sub{margin:0 0 18px;color:var(--muted);line-height:1.8}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .card{padding:20px}
    .card h3{margin:6px 0 10px;font-size:18px}
    .card p{margin:0;color:var(--muted);line-height:1.75}
    .badge{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;background:#f0f6ff;color:var(--brand);font-size:12px;font-weight:700}
    .section-alt{background:linear-gradient(180deg,transparent,#f9fbff);padding:24px 0;border-top:1px solid rgba(217,226,240,.65);border-bottom:1px solid rgba(217,226,240,.65)}
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:10px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#31405b;font-size:13px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;background:#fff;border:1px solid var(--line);border-radius:20px;position:relative}
    .step .num{font-size:12px;color:var(--brand);font-weight:800}
    .step h3{margin:8px 0 8px;font-size:17px}
    .step p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .table-wrap{overflow-x:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:900px}
    th,td{padding:16px 14px;text-align:left;border-bottom:1px solid #edf2f8;vertical-align:top}
    th{background:#f7faff;color:#20304d;font-size:14px}
    td{color:#3b4962;font-size:14px;line-height:1.7}
    .highlight{background:#f1f8ff}
    .rating{display:flex;align-items:center;gap:8px;color:#d98b00;font-weight:800}
    .stars{letter-spacing:2px}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .timeline{padding:20px}
    .timeline ul{list-style:none;padding:0;margin:0;display:grid;gap:14px}
    .timeline li{display:grid;grid-template-columns:72px 1fr;gap:12px;align-items:start;padding:12px 0;border-bottom:1px dashed #e6edf6}
    .timeline li:last-child{border-bottom:none}
    .timeline .tag{display:inline-flex;padding:5px 10px;border-radius:999px;background:#eef6ff;color:var(--brand);font-size:12px;font-weight:700}
    .reviews,.articles,.faq,.contact{display:grid;gap:16px}
    .review-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .review small{color:var(--muted)}
    .pricebox .row{display:flex;justify-content:space-between;gap:10px;padding:12px 0;border-bottom:1px solid #edf2f8}
    .pricebox .row:last-child{border-bottom:none}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px}
    summary{cursor:pointer;font-weight:700;color:#20304d}
    details p{margin:10px 0 0;color:var(--muted);line-height:1.75}
    .formbox{padding:22px}
    form{display:grid;gap:14px}
    .form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    label{display:grid;gap:8px;font-size:14px;color:#30415c;font-weight:700}
    input,select,textarea{width:100%;padding:13px 14px;border-radius:14px;border:1px solid #cfd9ea;background:#fff;font:inherit;color:var(--text);outline:none}
    input:focus,select:focus,textarea:focus{border-color:#8bb7ff;box-shadow:0 0 0 4px rgba(22,119,255,.12)}
    textarea{min-height:120px;resize:vertical}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    footer{margin-top:18px;padding:22px 0 30px;border-top:1px solid rgba(217,226,240,.85);background:#f8fbff;color:#2a3956}
    footer a{color:#1f63d6}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;align-items:start}
    .contact-list{display:grid;gap:10px;color:#34435f;line-height:1.7}
    .floating{position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px}
    .float-btn{width:50px;height:50px;border-radius:16px;background:linear-gradient(135deg,var(--brand),#47a5ff);color:#fff;display:grid;place-items:center;box-shadow:0 14px 30px rgba(22,119,255,.28)}
    .scrolltop{display:none}
    .fade{opacity:0;transform:translateY(18px);transition:.6s ease}
    .fade.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.split,.footer-grid,.grid-4,.grid-3,.steps,.form-row{grid-template-columns:1fr}
      .nav-links{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)}
      .nav-links.open{display:grid}
      .menu-toggle{display:inline-flex}
      .nav{position:relative}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max),calc(100% - 20px))}
      .hero-main,.hero-side,.card,.formbox{padding:18px}
      .hero-metrics{grid-template-columns:1fr}
      .hero-actions{flex-direction:column}
      .btn{width:100%}
      h1{font-size:30px}
      .section h2{font-size:24px}
      table{min-width:760px}
    }