:root{
      --bg:#f6f8fc;
      --card:#ffffff;
      --card2:#f2f7ff;
      --text:#172033;
      --muted:#5f6b84;
      --line:#dbe4f2;
      --brand:#2563eb;
      --brand2:#7c3aed;
      --accent:#ff7a59;
      --accent2:#12b981;
      --shadow:0 18px 45px rgba(25,42,70,.08);
      --radius:20px;
      --radius2:28px;
      --max:1200px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.10), transparent 30%),
        radial-gradient(circle at top right, rgba(124,58,237,.10), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f4f7fd 100%);
      color:var(--text);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--max)); margin:0 auto}
    header{
      position:sticky; top:0; z-index:40;
      backdrop-filter:blur(16px);
      background:rgba(248,251,255,.82);
      border-bottom:1px solid rgba(219,228,242,.85);
    }
    .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 .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:6px}
    .brand h1{font-size:18px;line-height:1.1;margin:0}
    .brand p{margin:3px 0 0;color:var(--muted);font-size:12px}
    .nav-links{display:flex; align-items:center; gap:18px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--muted);padding:8px 10px;border-radius:999px}
    .nav-links a:hover,.nav-links a:focus{background:#eef4ff;color:#15306b}
    .nav-actions{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; font-size:14px; cursor:pointer;
      transition:.25s ease; box-shadow:none;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; box-shadow:0 14px 30px rgba(37,99,235,.22)}
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 18px 34px rgba(37,99,235,.28)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{transform:translateY(-2px); border-color:#bfd0ee}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px}
    .menu-toggle span{display:block;width:18px;height:2px;background:var(--text);margin:4px auto;border-radius:2px}
    main{padding-bottom:18px}
    .hero{padding:34px 0 16px}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:20px;align-items:stretch}
    .hero-main,.hero-side,.section-card,.review-card,.faq-item,.article-card,.network-card,.compare-card,.form-card{
      background:rgba(255,255,255,.86); border:1px solid rgba(219,228,242,.9); border-radius:var(--radius2); box-shadow:var(--shadow)
    }
    .hero-main{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:#1d4ed8;background:#eef4ff;border:1px solid #d9e7ff;border-radius:999px;padding:8px 12px}
    .hero h2{font-size:clamp(32px,5vw,56px);line-height:1.05;margin:16px 0 14px}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.85}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .point{padding:14px;border-radius:18px;background:linear-gradient(180deg,#fff, #f7fbff);border:1px solid var(--line)}
    .point strong{display:block;font-size:18px;margin-bottom:6px}
    .point span{color:var(--muted);font-size:13px;line-height:1.6}
    .hero-side{padding:18px;display:flex;flex-direction:column;gap:14px}
    .mini-panel{padding:18px;border-radius:18px;background:linear-gradient(135deg,#eef6ff,#ffffff);border:1px solid var(--line)}
    .mini-panel h3{margin:0 0 8px;font-size:18px}
    .mini-panel ul{margin:0;padding-left:18px;color:var(--muted);line-height:1.8}
    .section{padding:16px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:14px}
    .section-head h3{margin:0;font-size:26px}
    .section-head p{margin:0;color:var(--muted);max-width:720px;line-height:1.7}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .section-card{padding:20px}
    .metric{font-size:28px;font-weight:800;margin:10px 0 4px}
    .sub{color:var(--muted);font-size:14px;line-height:1.7}
    .chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
    .chip{background:#eef4ff;color:#24428e;border:1px solid #d9e7ff;padding:7px 10px;border-radius:999px;font-size:12px}
    .cards-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .service{padding:20px}
    .service h4,.article-card h4,.review-card h4,.network-card h4{margin:0 0 8px;font-size:18px}
    .service p,.article-card p,.review-card p,.network-card p{margin:0;color:var(--muted);line-height:1.75}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;position:relative}
    .step .num{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:880px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2fa;text-align:left;vertical-align:top}
    th{background:#f5f8ff;font-size:14px}
    td{color:#31415f;line-height:1.7}
    .rating{display:flex;flex-direction:column;gap:10px;padding:22px}
    .stars{color:#f59e0b;font-size:22px;letter-spacing:2px}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;padding:18px 20px;display:flex;justify-content:space-between;align-items:center;gap:16px;background:transparent;border:none;font-size:16px;font-weight:700;color:var(--text);cursor:pointer;text-align:left}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease; padding:0 20px}
    .faq-a p{margin:0 0 18px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{max-height:220px}
    .faq-item.open .chev{transform:rotate(180deg)}
    .chev{transition:.25s ease}
    .review-card,.article-card,.network-card{padding:18px}
    .avatar{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#e7efff,#fdf1ee);display:grid;place-items:center;font-weight:800;color:#24428e;margin-bottom:12px}
    .form-card{padding:20px}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    label{font-size:14px;font-weight:700;display:block;margin-bottom:7px}
    input,select,textarea{
      width:100%; border:1px solid #dbe4f2; border-radius:14px; background:#fff;
      padding:12px 14px; font:inherit; color:var(--text); outline:none;
    }
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#9bb6e8; box-shadow:0 0 0 4px rgba(37,99,235,.09)}
    .full{grid-column:1/-1}
    .footer{
      margin-top:18px;
      background:#101a33;color:#dce6ff;border-top:1px solid rgba(255,255,255,.08)
    }
    .footer a{color:#ffffff}
    .footer .container{padding:24px 0}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:18px;align-items:start}
    .footer h4{margin:0 0 10px;font-size:18px;color:#fff}
    .footer p,.footer li{color:#c7d4f2;line-height:1.8}
    .footer ul{margin:0;padding-left:18px}
    .bottom{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.10);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#b8c6e6}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:50;display:flex;flex-direction:column;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 18px 30px rgba(37,99,235,.28)
    }
    .float-qrcode{
      position:fixed;right:16px;bottom:84px;z-index:49;width:240px;max-width:calc(100vw - 32px);
      background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:14px;display:none
    }
    .float-qrcode.open{display:block}
    .float-qrcode img{width:100%;border-radius:16px}
    .float-qrcode p{margin:10px 0 0;color:var(--muted);font-size:13px;line-height:1.6}
    .anchor-tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:10px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#30415f;font-size:13px}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .image-band{display:grid;grid-template-columns:1.1fr .9fr;gap:14px}
    .image-card{padding:18px}
    .image-card .ai-page-image{width:100%;border-radius:18px;border:1px solid var(--line);background:#fff}
    .mobile-only{display:none}
    .hidden{display:none}
    @media (max-width: 980px){
      .hero-grid,.grid-4,.cards-list,.timeline,.grid-3,.grid-2,.articles,.footer-grid,.image-band{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-grid;place-items:center}
      .nav-links.open{
        display:flex; position:absolute; left:16px; right:16px; top:72px;
        padding:14px; background:#fff; border:1px solid var(--line); border-radius:18px;
        box-shadow:var(--shadow); flex-direction:column; align-items:flex-start
      }
      .nav-actions .btn-ghost{display:none}
      .section-head{flex-direction:column;align-items:flex-start}
      .form-grid{grid-template-columns:1fr}
      .mobile-only{display:block}
    }