:root{
      --bg:#f6f7fb;
      --panel:#ffffff;
      --panel-2:#f0f4ff;
      --line:#e4e8f2;
      --text:#172033;
      --muted:#5d6880;
      --brand:#4a5cff;
      --brand-2:#ff6b6b;
      --brand-3:#00b8a9;
      --gold:#ffbf3c;
      --shadow:0 18px 40px rgba(23,32,51,.08);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Arial,Helvetica,"PingFang SC","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(74,92,255,.10), transparent 30%),
        radial-gradient(circle at 85% 10%, rgba(255,107,107,.10), transparent 26%),
        linear-gradient(180deg, #fbfcff 0%, #f6f7fb 30%, #f5f8ff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--container);margin:0 auto;padding:0 20px}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:saturate(140%) blur(14px);
      background:rgba(255,255,255,.86);
      border-bottom:1px solid rgba(228,232,242,.9);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      min-height:74px;
    }
    .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 6px 18px rgba(74,92,255,.12)}
    .brand-text{display:flex;flex-direction:column;line-height:1.15}
    .brand-text strong{font-size:18px;letter-spacing:.4px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:flex-end}
    .nav-links a,.nav-links button{
      border:1px solid transparent;background:transparent;color:var(--text);
      padding:9px 12px;border-radius:999px;font-size:14px;cursor:pointer;
      transition:.2s ease;
    }
    .nav-links a:hover,.nav-links button:hover{background:#eef2ff;border-color:#dbe3ff;transform:translateY(-1px)}
    .nav-cta{background:linear-gradient(135deg,var(--brand),#7a5cff)!important;color:#fff!important;box-shadow:0 10px 24px rgba(74,92,255,.22)}
    .menu-btn{display:none}
    .hero{
      padding:42px 0 26px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch;
    }
    .hero-panel{
      background:linear-gradient(135deg,#10182f 0%, #1c2b63 55%, #3a49bf 100%);
      color:#fff;border-radius:28px;padding:34px;position:relative;overflow:hidden;
      box-shadow:0 24px 60px rgba(26,38,86,.22);
    }
    .hero-panel:before,.hero-panel:after{
      content:"";position:absolute;border-radius:50%;filter:blur(2px);opacity:.6
    }
    .hero-panel:before{width:220px;height:220px;background:rgba(255,107,107,.28);right:-70px;top:-70px}
    .hero-panel:after{width:180px;height:180px;background:rgba(0,184,169,.24);left:-40px;bottom:-60px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);padding:8px 12px;border-radius:999px;font-size:13px}
    h1{margin:16px 0 12px;font-size:clamp(30px,4.5vw,54px);line-height:1.06}
    .hero p{margin:0;color:rgba(255,255,255,.84);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:13px 18px;border-radius:14px;font-weight:700;border:1px solid transparent;
      transition:.2s ease;cursor:pointer
    }
    .btn-primary{background:linear-gradient(135deg,#ffbf3c,#ff7a59);color:#10203d;box-shadow:0 16px 30px rgba(255,143,61,.26)}
    .btn-secondary{background:rgba(255,255,255,.10);color:#fff;border-color:rgba(255,255,255,.18)}
    .btn:hover{transform:translateY(-2px)}
    .hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .tag{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.14);font-size:13px}
    .hero-side{
      display:grid;gap:16px;
    }
    .mini-card{
      background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:24px;padding:20px;box-shadow:var(--shadow)
    }
    .mini-title{font-size:14px;color:var(--muted);margin:0 0 8px}
    .metric{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .metric div{background:linear-gradient(180deg,#f7f9ff,#fff);border:1px solid #e6ebf7;border-radius:18px;padding:14px}
    .metric strong{display:block;font-size:22px;margin-bottom:4px}
    .metric span{font-size:12px;color:var(--muted)}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:70ch}
    .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:var(--panel);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow);
      transition:.22s ease;position:relative;overflow:hidden
    }
    .card:hover{transform:translateY(-4px);border-color:#d7def0}
    .card h3{margin:0 0 10px;font-size:20px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .icon{
      width:46px;height:46px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(74,92,255,.12),rgba(255,107,107,.12));color:var(--brand);
      margin-bottom:12px;font-weight:800
    }
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{background:#f4f6ff;border:1px solid #e1e6fa;color:#334061;padding:8px 11px;border-radius:999px;font-size:13px}
    .steps{counter-reset:step}
    .step{
      display:flex;gap:14px;align-items:flex-start;padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff,#f9fbff);border:1px solid var(--line)
    }
    .step:before{
      counter-increment:step;content:counter(step);
      width:34px;height:34px;border-radius:50%;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),#7b61ff);color:#fff;font-weight:700;flex:none
    }
    .table-wrap{overflow:auto;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f5f7ff;color:#24314d;font-size:14px}
    td{color:var(--muted);font-size:14px}
    .rating{
      display:grid;grid-template-columns:1.05fr .95fr;gap:16px
    }
    .score-box{
      background:linear-gradient(135deg,#111b35,#283e8b 65%,#5f67ff);
      color:#fff;border-radius:24px;padding:24px
    }
    .score-big{font-size:58px;font-weight:800;line-height:1;margin:8px 0}
    .score-list{display:grid;gap:10px;margin-top:14px}
    .score-item{display:flex;justify-content:space-between;gap:10px;padding:11px 0;border-bottom:1px solid rgba(255,255,255,.12)}
    .score-item:last-child{border-bottom:none}
    .faq details{
      background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:var(--shadow)
    }
    .faq details+details{margin-top:12px}
    .faq summary{cursor:pointer;font-weight:700;list-style:none}
    .faq summary::-webkit-details-marker{display:none}
    .faq .ans{color:var(--muted);line-height:1.8;padding-top:10px}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review .name{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .stars{color:#ffb400;letter-spacing:2px;font-size:14px}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:110px 1fr;gap:14px;align-items:start;padding:14px 0;border-bottom:1px dashed #e2e7f2}
    .timeline-item:last-child{border-bottom:none}
    .muted{color:var(--muted)}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article a{display:inline-flex;margin-top:10px;color:var(--brand);font-weight:700}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700}
    input,select,textarea{
      width:100%;border:1px solid #dfe4ef;border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text)
    }
    textarea{min-height:120px;resize:vertical}
    .full{grid-column:1/-1}
    .footer{
      margin-top:12px;padding:24px 0 86px;border-top:1px solid var(--line);background:#f8faff;color:var(--text)
    }
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px}
    .footer a{color:#22305a}
    .footer small,.footer p{color:var(--muted)}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),#7b61ff);color:#fff;box-shadow:0 14px 28px rgba(74,92,255,.28)
    }
    .kefu{
      position:fixed;left:18px;bottom:18px;z-index:60;max-width:220px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden
    }
    .kefu header{padding:12px 14px;background:#f5f7ff;font-weight:700}
    .kefu .body{padding:12px 14px;font-size:14px;color:var(--muted)}
    .kefu img{width:100%;height:auto;border-radius:12px;margin-top:8px}
    .anchor-pill{display:inline-flex;align-items:center;gap:8px;margin-top:8px;font-size:13px;color:var(--muted)}
    .video-row{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .service-net{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
    .service-net div{background:#f7f9ff;border:1px solid #e5eafa;border-radius:16px;padding:14px;text-align:center;color:#30405f}
    .scroll-top{position:fixed;right:18px;bottom:84px;z-index:60;opacity:0;pointer-events:none;transition:.2s ease}
    .scroll-top.show{opacity:1;pointer-events:auto}
    .scroll-top .float-btn{width:46px;height:46px;border-radius:14px}
    .reveal{opacity:0;transform:translateY(16px);transition:.55s ease}
    .reveal.show{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-grid,.rating,.grid-3,.grid-2,.reviews,.articles,.footer-grid,.video-row,.service-net{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:20px;right:20px;top:78px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);justify-content:flex-start
      }
      .nav{position:relative}
      .form-grid{grid-template-columns:1fr}
      .timeline-item{grid-template-columns:1fr}
      .kefu{max-width:180px}
    }
    @media (max-width: 640px){
      .hero-panel{padding:24px;border-radius:22px}
      .section-head{flex-direction:column;align-items:flex-start}
      .score-big{font-size:46px}
      .container{padding:0 16px}
      .card,.mini-card,.score-box{border-radius:20px}
      .floating{right:14px;bottom:14px}
      .kefu{left:14px;bottom:14px}
    }