:root{
      --bg:#f5f9fb;
      --panel:#ffffff;
      --panel-2:#eef8fb;
      --text:#17313f;
      --muted:#5a7280;
      --line:#d9e7ee;
      --primary:#14b8a6;
      --primary-2:#2563eb;
      --accent:#0f766e;
      --shadow:0 14px 35px rgba(17, 44, 64, .08);
      --radius:20px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left, rgba(20,184,166,.12), transparent 28%),
      radial-gradient(circle at top right, rgba(37,99,235,.10), transparent 24%),
      var(--bg);color:var(--text);line-height:1.7}
    a{color:var(--primary-2);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .site-header{position:sticky;top:0;z-index:30;background:rgba(245,249,251,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(217,231,238,.75)}
    .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;border-radius:12px;background:#fff;padding:5px;border:1px solid var(--line)}
    .brand h2{margin:0;font-size:1rem;line-height:1.2}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:.82rem}
    .nav-links{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .nav-links a{color:var(--text);font-size:.92rem;padding:8px 10px;border-radius:999px}
    .nav-links a:hover,.nav-links a:focus{background:#e8f6f4;color:var(--accent)}
    .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:11px 16px;font-weight:700;cursor:pointer;transition:.25s ease;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 12px 24px rgba(20,184,166,.18)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px;color:var(--text)}
    main{padding:20px 0 8px}
    section{padding:20px 0}
    .hero{padding:18px 0 28px}
    .hero-grid{display:grid;grid-template-columns:1.18fr .82fr;gap:20px;align-items:stretch}
    .hero-copy,.hero-side,.card,.panel,.review,.faq-item,.article,.compare,.form-box,.timeline-item,.price-card,.badge-cloud,.network{background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(250,253,255,.97));border:1px solid rgba(217,231,238,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-copy{padding:30px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--accent);background:#e8faf7;border:1px solid #c7ece7;padding:7px 12px;border-radius:999px;font-size:.86rem;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(2rem,4vw,3.6rem);line-height:1.1;letter-spacing:-.02em}
    .lead{color:var(--muted);font-size:1.02rem;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0}
    .meta-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:22px}
    .meta{padding:14px;border-radius:16px;background:#f6fbfd;border:1px solid var(--line)}
    .meta strong{display:block;font-size:1.08rem}
    .meta span{color:var(--muted);font-size:.88rem}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:14px;justify-content:space-between}
    .hero-side .stack{display:grid;gap:12px}
    .stat-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f8fcff,#eef8fb);border:1px solid var(--line)}
    .stat strong{display:block;font-size:1.35rem}
    .stat span{color:var(--muted);font-size:.9rem}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:16px}
    .section-title h2{margin:0;font-size:1.45rem}
    .section-title p{margin:0;color:var(--muted)}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .card,.panel,.review,.article,.compare,.form-box,.price-card,.network,.timeline-item,.faq-item{padding:18px}
    .card h3,.panel h3,.review h3,.article h3,.compare h3,.form-box h3,.price-card h3,.network h3{margin:0 0 10px;font-size:1.08rem}
    .muted{color:var(--muted)}
    .pill-row,.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .pill,.tag{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#eef8fb;border:1px solid var(--line);color:var(--text);font-size:.9rem}
    .workflow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);position:relative}
    .step b{display:inline-flex;width:30px;height:30px;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;margin-bottom:10px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:900px}
    th,td{padding:14px 16px;border-bottom:1px solid #e8eef2;text-align:left;vertical-align:top}
    th{background:#f1f9fb;color:var(--text)}
    .rating{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:stretch}
    .stars{font-size:1.15rem;color:#f59e0b;letter-spacing:2px}
    .accordion{display:grid;gap:12px}
    .faq-item summary{cursor:pointer;font-weight:700;list-style:none}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .answer{color:var(--muted);padding-top:10px}
    .reviews .review{display:flex;flex-direction:column;gap:10px}
    .avatar{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#dff8f3,#dbeafe);color:var(--accent);font-weight:800}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start}
    .timeline-item .dot{width:12px;height:12px;border-radius:50%;background:var(--primary);margin-top:8px;box-shadow:0 0 0 6px rgba(20,184,166,.12)}
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article a{font-weight:700}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    input,select,textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);font:inherit}
    textarea{min-height:116px;resize:vertical}
    label{display:block;font-size:.92rem;margin:0 0 6px;font-weight:700}
    .full{grid-column:1/-1}
    .footer{margin-top:16px;background:#0f3b46;color:#e9fbff}
    .footer a{color:#b9f3ea}
    .footer .container{padding:24px 0}
    .footer-top{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .footer .brand h2,.footer h3,.footer p,.footer li{color:#e9fbff}
    .footer .muted{color:#b7d8df}
    .footer ul{margin:0;padding-left:18px}
    .footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:18px;padding-top:14px;color:#cfeaf0;font-size:.92rem}
    .float-box{position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px}
    .float-box a,.float-box button{border:none;box-shadow:0 10px 24px rgba(15,23,42,.16)}
    .backtop{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;border-radius:999px;padding:12px 14px}
    .mobile-only{display:none}
    .fade-in{opacity:0;transform:translateY(16px);transition:.6s ease}
    .fade-in.in-view{opacity:1;transform:none}
    .sitemap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
    .sitemap a{padding:12px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--text)}
    .logo-inline{display:flex;align-items:center;gap:10px}
    .logo-inline img{width:70px;height:70px;object-fit:contain;border-radius:18px;background:#fff;border:1px solid var(--line);padding:8px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.workflow,.article-list,.footer-top,.rating,.sitemap{grid-template-columns:1fr}
      .meta-row,.stat-strip{grid-template-columns:1fr 1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .mobile-only{display:block}
      .nav.open .nav-links{display:flex;position:absolute;left:16px;right:16px;top:68px;flex-direction:column;align-items:stretch;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
      .nav.open .nav-cta{display:none}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container), calc(100% - 22px))}
      .hero-copy,.hero-side,.card,.panel,.review,.article,.compare,.form-box,.timeline-item,.price-card,.network,.faq-item{padding:16px}
      .meta-row,.stat-strip,.form-grid{grid-template-columns:1fr}
      h1{font-size:1.95rem}
      .section-title{flex-direction:column;align-items:flex-start}
    }