:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f2f6ff;
      --text:#162033;
      --muted:#5d6b84;
      --line:#dbe3f1;
      --brand:#2b67ff;
      --brand-2:#19c3ff;
      --accent:#ff9a2f;
      --good:#19a974;
      --shadow:0 18px 50px rgba(25,41,73,.10);
      --radius:22px;
      --radius-sm:16px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at 10% 0%, rgba(43,103,255,.10), transparent 25%),
      radial-gradient(circle at 90% 10%, rgba(25,195,255,.10), transparent 22%),
      linear-gradient(180deg,#fbfcff 0%, #f7f8fc 100%);
      color:var(--text);line-height:1.7}
    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:30;background:rgba(247,248,252,.84);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,227,241,.9)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand img{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px}
    .brand .txt{min-width:0}
    .brand strong{display:block;font-size:16px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}
    .nav-links a,.nav-btn{padding:9px 12px;border-radius:999px;border:1px solid transparent;font-size:14px;color:var(--text);transition:.2s ease}
    .nav-links a:hover,.nav-btn:hover{background:#fff;border-color:var(--line);box-shadow:0 10px 24px rgba(22,32,51,.08);transform:translateY(-1px)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .nav-btn.primary,.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 14px 30px rgba(43,103,255,.22)}
    .nav-btn.primary:hover,.btn.primary:hover{filter:saturate(1.05);transform:translateY(-1px)}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    main{padding:26px 0 8px}
    section{scroll-margin-top:88px}
    .hero{padding:18px 0 8px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch}
    .hero-card,.panel,.stat,.feature,.case,.review,.faq-item,.article,.compare,.form-card,.network,.timeline,.price-card,.tags,.help-card{background:var(--panel);border:1px solid rgba(219,227,241,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-card{padding:34px;position:relative;overflow:hidden}
    .hero-card:before,.hero-card:after{content:"";position:absolute;border-radius:50%;pointer-events:none}
    .hero-card:before{width:240px;height:240px;background:radial-gradient(circle, rgba(25,195,255,.18), transparent 65%);right:-60px;top:-40px}
    .hero-card:after{width:180px;height:180px;background:radial-gradient(circle, rgba(43,103,255,.12), transparent 65%);left:-40px;bottom:-30px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:rgba(43,103,255,.08);color:var(--brand);font-weight:700;font-size:13px}
    h1{margin:14px 0 12px;font-size:clamp(30px,4vw,54px);line-height:1.08;letter-spacing:-.03em}
    .lead{margin:0;color:var(--muted);font-size:16px;max-width:60ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);font-weight:700;transition:.2s ease}
    .btn:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(22,32,51,.08)}
    .hero-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .stat{padding:22px}
    .stat strong{display:block;font-size:30px;line-height:1;color:var(--brand)}
    .stat span{display:block;margin-top:8px;color:var(--muted);font-size:14px}
    .hero-side{display:grid;gap:14px}
    .mini-panel{padding:22px}
    .mini-panel h3{margin:0 0 10px;font-size:18px}
    .mini-panel p{margin:0;color:var(--muted)}
    .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .chip{padding:8px 12px;border-radius:999px;background:var(--panel-2);border:1px solid #dce6fb;font-size:13px;color:#27406b}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .section{padding:18px 0}
    .section h2{margin:0 0 12px;font-size:28px;line-height:1.2}
    .section .sub{margin:0 0 18px;color:var(--muted);max-width:70ch}
    .feature{padding:22px}
    .feature h3{margin:0 0 10px;font-size:18px}
    .feature p{margin:0;color:var(--muted)}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .panel{padding:24px}
    .panel h3{margin:0 0 12px;font-size:20px}
    .panel ul{margin:0;padding-left:18px;color:var(--muted)}
    .panel li{margin:8px 0}
    .timeline{padding:22px}
    .steps{display:grid;gap:14px}
    .step{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;padding:16px;border-radius:18px;background:#fbfcff;border:1px solid var(--line)}
    .step b{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
    .step h4{margin:0 0 6px;font-size:16px}
    .step p{margin:0;color:var(--muted);font-size:14px}
    .compare{padding:24px;overflow:auto}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f5f8ff;color:#233553;font-size:14px}
    td{color:#44536f}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:rgba(25,169,116,.10);color:var(--good);font-weight:700;font-size:12px}
    .case-grid,.review-grid,.article-grid,.faq-grid,.network-grid,.price-grid,.tag-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .case,.review,.article,.faq-item,.network,.price-card,.tags,.help-card{padding:20px}
    .case h3,.review h3,.article h3,.faq-item h3,.help-card h3{margin:0 0 8px;font-size:18px}
    .meta{color:var(--muted);font-size:14px}
    .quote{color:var(--text);margin:10px 0 0}
    .faq-item summary{cursor:pointer;list-style:none;font-weight:700}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item p{margin:12px 0 0;color:var(--muted)}
    .form-card{padding:24px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    label{display:block;font-weight:700;font-size:14px;margin:0 0 8px;color:#24324c}
    input,select,textarea{width:100%;padding:13px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text);font:inherit;outline:none}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8ab0ff;box-shadow:0 0 0 4px rgba(43,103,255,.12)}
    .full{grid-column:1/-1}
    .footer{margin-top:18px;padding:24px 0 30px;border-top:1px solid var(--line);background:rgba(255,255,255,.55)}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer a{color:#224bcb}
    .footer p,.footer li{color:var(--muted)}
    .footer ul{margin:0;padding-left:18px}
    .floating{position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px}
    .float-btn{display:inline-flex;align-items:center;justify-content:center;min-width:52px;height:52px;padding:0 14px;border-radius:16px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 18px 40px rgba(43,103,255,.24);font-weight:700}
    .float-btn.secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .reveal{opacity:0;transform:translateY(16px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-links{display:none}
    @media (max-width: 1024px){
      .hero-grid,.split,.grid-4,.case-grid,.review-grid,.article-grid,.faq-grid,.network-grid,.price-grid,.tag-grid,.footer-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 760px){
      .nav-links,.nav-actions .nav-btn:not(.primary){display:none}
      .menu-toggle{display:inline-flex}
      .mobile-links{display:none;flex-direction:column;gap:8px;padding:0 0 14px}
      .mobile-links a{padding:11px 12px;border-radius:12px;background:#fff;border:1px solid var(--line)}
      .hero-grid,.split,.grid-4,.case-grid,.review-grid,.article-grid,.faq-grid,.network-grid,.price-grid,.tag-grid,.footer-grid,.form-grid{grid-template-columns:1fr}
      .hero-card{padding:24px}
      .hero-metrics{grid-template-columns:1fr 1fr}
      h2{font-size:24px}
    }