:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f1f5ff;
      --text:#172033;
      --muted:#5e6b84;
      --line:#dbe3f1;
      --brand:#6a5cff;
      --brand-2:#1fb6ff;
      --brand-3:#7cdbff;
      --accent:#ff7ac6;
      --shadow:0 18px 50px rgba(42,60,98,.10);
      --radius:22px;
      --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(106,92,255,.12), transparent 28%),
        radial-gradient(circle at top right, rgba(31,182,255,.10), transparent 24%),
        linear-gradient(180deg, #fbfcff 0%, #f7f8fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .topbar{
      position:sticky;top:0;z-index:60;
      backdrop-filter:blur(14px);
      background:rgba(247,248,252,.82);
      border-bottom:1px solid rgba(219,227,241,.8);
    }
    header .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 .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:0 8px 22px rgba(38,50,79,.10)}
    .brand h1{margin:0;font-size:18px;line-height:1.15}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:12px}
    .navlinks{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .navlinks a{font-size:14px;color:var(--text);opacity:.85}
    .navlinks a:hover{color:var(--brand)}
    .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:12px 18px;font-weight:700;
      transition:.25s ease;cursor:pointer;white-space:nowrap;
    }
    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg,var(--brand),#4f8cff 55%,var(--brand-2));
      box-shadow:0 14px 30px rgba(106,92,255,.24);
    }
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 18px 36px rgba(106,92,255,.28)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-1px)}
    .menu-toggle{
      display:none;border:1px solid var(--line);background:#fff;border-radius:12px;width:44px;height:44px;
    }
    .menu-toggle span{display:block;width:18px;height:2px;background:#25324b;margin:4px auto;border-radius:2px}
    main{overflow:hidden}
    section{padding:72px 0}
    .hero{padding:38px 0 54px;position:relative}
    .hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:26px;align-items:stretch}
    .hero-copy,.hero-side,.panel,.card,.quote,.faq-item,.form-wrap,.compare-wrap,.section-shell{
      background:rgba(255,255,255,.88);border:1px solid rgba(219,227,241,.85);box-shadow:var(--shadow);border-radius:var(--radius)
    }
    .hero-copy{padding:34px;position:relative;overflow:hidden}
    .hero-copy:before{
      content:"";position:absolute;inset:auto -40px -65px auto;width:220px;height:220px;border-radius:50%;
      background:radial-gradient(circle, rgba(124,219,255,.45), rgba(106,92,255,.08) 60%, transparent 70%);
    }
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,rgba(106,92,255,.12),rgba(31,182,255,.12));color:#3d4a69;border:1px solid rgba(106,92,255,.18);padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700}
    .hero h2{margin:18px 0 12px;font-size:clamp(32px,4vw,54px);line-height:1.05}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .mini{
      padding:14px 14px 12px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7f9ff);border:1px solid var(--line)
    }
    .mini strong{display:block;font-size:18px}
    .mini span{font-size:12px;color:var(--muted)}
    .hero-side{padding:20px;display:grid;gap:14px;align-content:start}
    .status{
      padding:18px;border-radius:18px;background:linear-gradient(135deg,rgba(106,92,255,.10),rgba(31,182,255,.08));
      border:1px solid rgba(106,92,255,.12)
    }
    .status h3,.section-title h3{margin:0 0 8px;font-size:18px}
    .status p,.section-title p{margin:0;color:var(--muted);line-height:1.7}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#304058}
    .section-title{display:flex;flex-direction:column;gap:10px;margin-bottom:22px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .card,.quote,.faq-item,.panel{padding:20px}
    .card h3,.quote h3,.panel h3{margin:0 0 10px;font-size:18px}
    .card p,.quote p,.card li{color:var(--muted);line-height:1.75}
    .metric{display:flex;align-items:flex-end;justify-content:space-between;gap:10px}
    .metric strong{font-size:28px}
    .metric span{font-size:12px;color:var(--muted)}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(106,92,255,.14),rgba(31,182,255,.16));color:var(--brand);font-weight:800
    }
    .split{display:grid;grid-template-columns:1.02fr .98fr;gap:18px;align-items:start}
    .panel ul{margin:12px 0 0;padding-left:18px}
    .panel li{margin:8px 0;color:var(--muted)}
    .steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{
      padding:20px;border-radius:22px;background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line);position:relative
    }
    .step:before{
      counter-increment:step;content:"0" counter(step);
      position:absolute;right:16px;top:16px;font-size:12px;font-weight:800;color:rgba(106,92,255,.35)
    }
    .step h3{margin:10px 0 8px}
    .table-wrap{overflow:auto}
    table{width:100%;border-collapse:separate;border-spacing:0;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f4f7ff;color:#2b3750;font-size:14px}
    tr:last-child td{border-bottom:none}
    .good{color:#1f8b6f;font-weight:700}
    .ok{color:#4f679a;font-weight:700}
    .bad{color:#aa5b5b;font-weight:700}
    .accordion{display:grid;gap:12px}
    .faq-item summary{
      list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px;font-weight:700
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary:after{content:"+";font-size:22px;color:var(--brand)}
    .faq-item[open] summary:after{content:"–"}
    .faq-item p{margin:14px 0 0;color:var(--muted);line-height:1.8}
    .quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .quote .meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}
    .stars{color:#ffb400;letter-spacing:1px}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .timeline .card{position:relative}
    .timeline .card:before{
      content:"";position:absolute;left:20px;top:22px;width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2))
    }
    .timeline .card{padding-top:34px}
    .news,.links,.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .news a{display:block;padding:16px 0;border-bottom:1px dashed var(--line);color:var(--text)}
    .news a:last-child{border-bottom:none;padding-bottom:0}
    .form-wrap{padding:22px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:grid;gap:8px;font-size:14px;font-weight:700}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;padding:13px 14px;font:inherit;color:var(--text);outline:none
    }
    textarea{min-height:120px;resize:vertical;grid-column:1/-1}
    input:focus,select:focus,textarea:focus{border-color:rgba(106,92,255,.6);box-shadow:0 0 0 4px rgba(106,92,255,.08)}
    .form-actions{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:12px;align-items:center}
    .note{color:var(--muted);font-size:13px;line-height:1.7}
    .footer{
      padding:34px 0 24px;border-top:1px solid rgba(219,227,241,.9);background:linear-gradient(180deg,#f7f8fc,#f2f5fb)
    }
    .footer a{color:#2f466f}
    .footer a:hover{color:var(--brand)}
    .copyright{margin-top:18px;color:var(--muted);font-size:13px}
    .floatbar{
      position:fixed;right:16px;bottom:18px;z-index:80;display:grid;gap:10px
    }
    .floatbar a,.floatbar button{
      width:50px;height:50px;border-radius:16px;border:1px solid rgba(219,227,241,.9);background:#fff;box-shadow:0 16px 34px rgba(38,50,79,.12);display:grid;place-items:center;cursor:pointer
    }
    .floatbar svg{width:22px;height:22px;fill:var(--brand)}
    .scrollup{display:none}
    .reveal{opacity:0;transform:translateY(14px);transition:.55s ease}
    .reveal.in{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.split,.grid-4,.grid-3,.steps,.quotes,.timeline,.news,.links,.footer-cols{grid-template-columns:1fr 1fr}
      .navlinks{display:none}
      .menu-toggle{display:inline-grid;place-items:center}
      .mobile-only{display:block}
    }
    @media (max-width: 720px){
      section{padding:56px 0}
      .hero{padding-top:22px}
      .hero-grid,.split,.grid-4,.grid-3,.steps,.quotes,.timeline,.news,.links,.footer-cols{grid-template-columns:1fr}
      .hero-copy{padding:24px}
      .hero-meta{grid-template-columns:1fr}
      .nav-actions .btn-ghost{display:none}
      form{grid-template-columns:1fr}
      textarea,.form-actions{grid-column:1}
      .floatbar{right:12px;bottom:12px}
      .menu-panel{
        display:none;position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);
        border-radius:18px;box-shadow:var(--shadow);padding:14px
      }
      .menu-panel.open{display:grid;gap:10px}
      .menu-panel a{padding:10px 6px;border-bottom:1px solid #eef2f8}
      .menu-panel a:last-child{border-bottom:none}
    }