:root{
      --bg:#f6f7fb;
      --panel:#ffffff;
      --panel-2:#f0f5ff;
      --text:#172033;
      --muted:#5c677d;
      --line:#dde5f2;
      --accent:#2563eb;
      --accent-2:#ff5b7d;
      --accent-3:#00b8a9;
      --shadow:0 18px 50px rgba(23,32,51,.10);
      --shadow-soft:0 10px 24px rgba(23,32,51,.08);
      --radius:22px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.12), transparent 26%),
        radial-gradient(circle at top right, rgba(255,91,125,.12), transparent 22%),
        linear-gradient(180deg, #ffffff 0%, #f7f9fe 26%, #f5f7fb 100%);
    }
    img{display:block;max-width:100%}
    a{color:inherit;text-decoration:none}
    .container{width:min(calc(100% - 32px), var(--container));margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:30;
      backdrop-filter:blur(14px);
      background:rgba(255,255,255,.82);
      border-bottom:1px solid rgba(221,229,242,.78);
    }
    .nav-bar{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}
    .ai-page-logo{width:42px;height:42px;object-fit:contain;flex:none}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:18px;line-height:1.1}
    .brand-text span{font-size:12px;color:var(--muted);margin-top:4px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px;font-weight:700}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#2c3550;padding:8px 10px;border-radius:10px;transition:.2s}
    .nav-links a:hover{background:#edf3ff;color:#1740aa}
    .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;font-size:14px;
      transition:transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
      cursor:pointer;
    }
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-soft)}
    .btn-primary{background:linear-gradient(135deg,var(--accent) 0%, #6d5efc 100%);color:#fff}
    .btn-secondary{background:#fff;color:#20304d;border-color:var(--line)}
    .hero{padding:54px 0 28px;position:relative;overflow:hidden}
    .hero-wrap{
      display:grid;grid-template-columns:1.18fr .82fr;gap:24px;align-items:stretch;
    }
    .hero-copy,.hero-panel,.section-card,.feature-card,.metric,.review,.faq-item,.form-card,.aside-card,.compare-card,.story-card,.article-card,.network-card,.price-card{
      background:rgba(255,255,255,.92);
      border:1px solid rgba(221,229,242,.9);
      box-shadow:var(--shadow-soft);
      border-radius:var(--radius);
    }
    .hero-copy{padding:34px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      background:linear-gradient(90deg, rgba(37,99,235,.12), rgba(255,91,125,.12));
      color:#1c3faa;border:1px solid rgba(37,99,235,.12);
      padding:8px 14px;border-radius:999px;font-size:13px;font-weight:700;
    }
    h1{margin:18px 0 14px;font-size:clamp(30px, 4.2vw, 52px);line-height:1.08;letter-spacing:-.03em}
    .lead{font-size:17px;line-height:1.75;color:var(--muted);margin:0 0 22px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:10px}
    .mini{
      background:linear-gradient(180deg,#f8fbff,#eef4ff);
      border:1px solid #dbe7ff;border-radius:18px;padding:14px
    }
    .mini strong{display:block;font-size:18px}
    .mini span{display:block;color:var(--muted);font-size:12px;margin-top:4px;line-height:1.5}
    .hero-panel{padding:22px;display:grid;gap:14px}
    .signal{
      border-radius:20px;padding:18px;background:linear-gradient(135deg,#0f172a 0%, #1d4ed8 55%, #ff4d7d 100%);color:#fff;position:relative;overflow:hidden;
      min-height:174px;
    }
    .signal::after{
      content:"";position:absolute;inset:-40px -20px auto auto;width:160px;height:160px;border-radius:50%;
      background:rgba(255,255,255,.12);filter:blur(8px);
    }
    .signal h2{margin:0 0 10px;font-size:22px}
    .signal p{margin:0;max-width:28ch;line-height:1.75;color:rgba(255,255,255,.9)}
    .signal .tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .tag{display:inline-flex;align-items:center;padding:7px 11px;border-radius:999px;background:rgba(255,255,255,.12);color:#fff;font-size:12px}
    .panel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .panel-box{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}
    .panel-box strong{display:block;font-size:18px}
    .panel-box span{display:block;color:var(--muted);font-size:13px;line-height:1.6;margin-top:6px}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:62ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .metric,.feature-card,.review,.article-card,.network-card,.price-card{padding:20px}
    .metric .num{font-size:30px;font-weight:800;line-height:1}
    .metric .label{margin-top:10px;font-weight:700}
    .metric .desc{margin-top:8px;color:var(--muted);font-size:13px;line-height:1.65}
    .feature-card h3,.review h3,.article-card h3,.network-card h3,.price-card h3{margin:0 0 10px;font-size:18px}
    .feature-card p,.review p,.article-card p,.network-card p,.price-card p{margin:0;color:var(--muted);line-height:1.75}
    .feature-card ul{margin:12px 0 0;padding:0;list-style:none;display:grid;gap:8px}
    .feature-card li{padding-left:18px;position:relative;color:#34415d;line-height:1.7}
    .feature-card li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2))}
    .section-card{padding:22px}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .timeline{display:grid;gap:14px}
    .step{
      display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;
      padding:16px;border:1px solid var(--line);border-radius:18px;background:#fff
    }
    .step b{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,#ebf2ff,#ffe8ef);color:#153a9e}
    .step h3{margin:0 0 6px;font-size:16px}
    .step p{margin:0;color:var(--muted);line-height:1.7}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:separate;border-spacing:0;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f4f8ff;color:#172033;font-size:14px}
    td{color:#34415d;line-height:1.7;font-size:14px}
    tr:last-child td{border-bottom:none}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700;background:#eef4ff;color:#1e40af}
    .compare-card .score{font-size:34px;font-weight:900;color:#0f4bd6}
    .compare-card .star{color:#ff9f0f;font-size:18px;letter-spacing:2px}
    .tags{display:flex;flex-wrap:wrap;gap:10px}
    .tags .tag{background:#fff;color:#24406a;border:1px solid var(--line)}
    .price-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .price-card .money{font-size:28px;font-weight:900;color:#1b3fd1;margin:8px 0}
    .faq-list{display:grid;gap:12px}
    .faq-item summary{
      list-style:none;cursor:pointer;padding:18px 20px;font-weight:700;display:flex;justify-content:space-between;gap:16px;align-items:center
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary::after{content:"+";font-size:22px;color:var(--accent);line-height:1}
    .faq-item[open] summary::after{content:"–"}
    .faq-item .answer{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .reviews,.articles,.network,.prices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .quote{font-size:14px;color:#4b5874;line-height:1.8;margin-top:10px}
    .avatar{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#e9efff,#ffe4ec);display:grid;place-items:center;font-weight:800;color:#2342ab}
    .review-top{display:flex;align-items:center;gap:12px}
    .review-top div{display:flex;flex-direction:column}
    .review-top strong{font-size:15px}
    .review-top span{font-size:12px;color:var(--muted)}
    .form-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start}
    form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    .field label{font-size:14px;font-weight:700}
    .field input,.field select,.field textarea{
      width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:13px 14px;
      font:inherit;color:var(--text);outline:none;transition:border-color .2s, box-shadow .2s
    }
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#8aa7ff;box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    .field textarea{min-height:132px;resize:vertical}
    .form-note{font-size:13px;color:var(--muted);line-height:1.7}
    .contact-list{display:grid;gap:12px}
    .contact-chip{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:#fff}
    .contact-chip strong{display:block}
    .contact-chip span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:18px;border:none;cursor:pointer;color:#fff;font-weight:800;
      box-shadow:var(--shadow);display:grid;place-items:center;
    }
    .float-a{background:linear-gradient(135deg,var(--accent),#6d5efc)}
    .float-b{background:linear-gradient(135deg,var(--accent-2),#ff8a5c)}
    .footer{
      margin-top:18px;padding:24px 0 30px;border-top:1px solid var(--line);background:rgba(255,255,255,.88);color:#24314d
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr 1fr;gap:16px;align-items:start}
    .footer a{color:#2347b7}
    .footer small{color:#5d6880;line-height:1.7}
    .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease}
    .reveal.in{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-wrap,.split,.form-grid,.footer-grid,.grid-3,.grid-4,.price-grid,.reviews,.articles,.network{grid-template-columns:1fr}
      .nav-toggle{display:inline-flex}
      .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);flex-direction:column;align-items:stretch}
      .nav-links.open{display:flex}
      .nav-links a{padding:12px 14px;background:#f7f9ff}
      .hero{padding-top:28px}
      .hero-copy{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .panel-grid{grid-template-columns:1fr}
      .section-head{align-items:start;flex-direction:column}
    }