:root{
      --bg:#f5f7fb;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#18212f;
      --muted:#5f6b7a;
      --line:#dbe4f0;
      --brand:#2764ff;
      --brand2:#ff7a59;
      --brand3:#18b8a7;
      --shadow:0 18px 50px rgba(25,46,95,.10);
      --radius:20px;
      --radius-sm:14px;
      --container: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;color:var(--text);background:
      radial-gradient(circle at top left, rgba(39,100,255,.12), transparent 30%),
      radial-gradient(circle at 90% 10%, rgba(255,122,89,.10), transparent 25%),
      linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #f8fbff 100%);
      line-height:1.7}
    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:50;backdrop-filter:saturate(180%) blur(12px);background:rgba(255,255,255,.82);border-bottom:1px solid rgba(219,228,240,.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:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:6px;box-shadow:0 8px 24px rgba(39,100,255,.08)}
    .brand strong{display:block;font-size:16px;line-height:1.2}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .navlinks{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .navlinks a{font-size:14px;color:var(--muted);padding:8px 10px;border-radius:999px;transition:.2s ease}
    .navlinks a:hover,.navlinks a.active{color:var(--text);background:#eef4ff}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.22s ease;white-space:nowrap}
    .btn-primary{color:#fff;background:linear-gradient(135deg,var(--brand),#5b8cff);box-shadow:0 12px 24px rgba(39,100,255,.24)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(39,100,255,.28)}
    .btn-ghost{background:#fff;border:1px solid var(--line);color:var(--text)}
    .btn-ghost:hover{transform:translateY(-2px);border-color:#bed1ff}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    header.hero{padding:36px 0 22px}
    .hero-shell{position:relative;overflow:hidden;border:1px solid rgba(255,255,255,.7);border-radius:28px;background:
      linear-gradient(135deg, rgba(39,100,255,.10), rgba(255,122,89,.08) 52%, rgba(24,184,167,.08));
      box-shadow:var(--shadow)}
    .hero-shell::before,.hero-shell::after{content:"";position:absolute;border-radius:999px;filter:blur(2px);pointer-events:none}
    .hero-shell::before{width:220px;height:220px;right:-70px;top:-70px;background:radial-gradient(circle, rgba(39,100,255,.28), transparent 68%)}
    .hero-shell::after{width:180px;height:180px;left:-50px;bottom:-60px;background:radial-gradient(circle, rgba(255,122,89,.18), transparent 68%)}
    .hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:24px;padding:40px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.72);border:1px solid rgba(219,228,240,.95);color:#345; border-radius:999px;padding:8px 14px;font-size:13px;font-weight:700}
    h1{margin:14px 0 14px;font-size:clamp(30px,4vw,54px);line-height:1.1;letter-spacing:-.02em}
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
    .metric{background:rgba(255,255,255,.82);border:1px solid rgba(219,228,240,.95);border-radius:18px;padding:16px;box-shadow:0 10px 30px rgba(31,47,82,.06)}
    .metric b{display:block;font-size:22px;margin-bottom:4px}
    .metric span{font-size:13px;color:var(--muted)}
    .hero-panel{align-self:stretch;background:rgba(255,255,255,.88);border:1px solid rgba(219,228,240,.95);border-radius:24px;padding:22px;display:flex;flex-direction:column;gap:14px}
    .hero-panel h2{margin:0;font-size:18px}
    .hero-tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{font-size:13px;color:#234;background:#eff5ff;border:1px solid #dce8ff;padding:8px 12px;border-radius:999px}
    section{padding:18px 0}
    .section-card{background:rgba(255,255,255,.92);border:1px solid rgba(219,228,240,.95);border-radius:26px;box-shadow:var(--shadow)}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted)}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;transition:.22s ease;box-shadow:0 10px 28px rgba(25,46,95,.05)}
    .card:hover{transform:translateY(-3px);box-shadow:0 18px 38px rgba(25,46,95,.10)}
    .card h3,.card h4{margin:0 0 10px}
    .card p{margin:0;color:var(--muted)}
    .icon{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg, rgba(39,100,255,.14), rgba(255,122,89,.12));color:#234;font-weight:800;margin-bottom:14px}
    .list{margin:0;padding-left:18px;color:var(--muted)}
    .list li{margin:8px 0}
    .timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{position:relative;padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff,#fbfdff);border:1px solid var(--line)}
    .step b{display:inline-flex;width:32px;height:32px;border-radius:50%;align-items:center;justify-content:center;color:#fff;background:linear-gradient(135deg,var(--brand),#5b8cff);margin-bottom:10px}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2f7;text-align:left;font-size:14px;vertical-align:top}
    th{background:#f6f9ff;color:#243042}
    .badge{display:inline-flex;align-items:center;padding:7px 11px;border-radius:999px;background:#eef7ff;color:#245;font-size:12px;font-weight:700}
    .faq details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px}
    .faq details+details{margin-top:12px}
    .faq summary{cursor:pointer;font-weight:700;list-style:none}
    .faq summary::-webkit-details-marker{display:none}
    .faq .answer{color:var(--muted);margin-top:10px}
    .review{display:flex;flex-direction:column;gap:14px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px}
    .stars{color:#ffb400;font-size:16px;letter-spacing:1px}
    .news-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .news-item{padding:18px;border-radius:18px;border:1px solid var(--line);background:#fff}
    .news-item a{display:block;font-weight:700;margin-top:8px;color:var(--text)}
    .form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    .field.full{grid-column:1/-1}
    label{font-size:14px;font-weight:700}
    input,select,textarea{width:100%;border:1px solid #d7e0ec;border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:.2s ease}
    input:focus,select:focus,textarea:focus{border-color:#8db0ff;box-shadow:0 0 0 4px rgba(39,100,255,.10)}
    textarea{min-height:120px;resize:vertical}
    .footer{padding:20px 0 26px;color:var(--muted)}
    .footer-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer a{color:#254dcb}
    .mini-links{display:flex;flex-wrap:wrap;gap:10px}
    .mini-links a{padding:8px 12px;border-radius:999px;background:#eef4ff;border:1px solid #dce7ff;color:#284}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px}
    .float-btn{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand2),#ff9d67);color:#fff;box-shadow:0 12px 24px rgba(255,122,89,.25)}
    .float-btn.secondary{background:linear-gradient(135deg,var(--brand),#5b8cff)}
    .kefu{display:flex;gap:14px;align-items:center}
    .kefu img{width:92px;height:92px;object-fit:cover;border-radius:18px;border:1px solid var(--line);background:#fff}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#365;font-size:13px}
    .subtle{color:var(--muted)}
    .fade-in{opacity:0;transform:translateY(14px);transition:.6s ease}
    .fade-in.show{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.timeline,.footer-inner,.news-list{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      .hero-metrics{grid-template-columns:1fr}
      .form{grid-template-columns:1fr}
      .navlinks{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);padding:12px 16px;box-shadow:0 16px 24px rgba(25,46,95,.08)}
      .navlinks.open{display:flex;flex-direction:column;align-items:flex-start;gap:4px}
      .menu-btn{display:inline-flex}
      .nav{position:relative}
    }