:root{
      --bg:#f7f6f2;
      --bg2:#eef3ff;
      --card:#ffffff;
      --text:#1f2a37;
      --muted:#5f6b7a;
      --line:#dbe3ef;
      --brand:#3a63ff;
      --brand2:#ff8a5b;
      --brand3:#7a5cff;
      --shadow:0 18px 48px rgba(35,52,92,.10);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family: -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,Helvetica,Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(58,99,255,.12), transparent 28%),
        radial-gradient(circle at 80% 10%, rgba(255,138,91,.12), transparent 24%),
        linear-gradient(180deg, #fbfbff 0%, var(--bg) 42%, #f9f7f3 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--container)); margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter: blur(16px);
      background:rgba(255,255,255,.76);
      border-bottom:1px solid rgba(219,227,239,.8);
    }
    .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;border:1px solid var(--line);padding:4px;box-shadow:0 8px 20px rgba(0,0,0,.05)}
    .brand-title{font-weight:800;letter-spacing:.2px;white-space:nowrap}
    .brand-sub{font-size:12px;color:var(--muted);margin-top:2px;white-space:nowrap}
    .nav-links{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:10px}
    .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:.25s ease;
    }
    .nav-links a:hover,.nav-links button:hover{background:#fff;border-color:var(--line);box-shadow:0 10px 24px rgba(0,0,0,.05);transform:translateY(-1px)}
    .nav-cta{background:linear-gradient(135deg,var(--brand),var(--brand3));color:#fff !important;box-shadow:0 14px 28px rgba(58,99,255,.22)}
    .menu-toggle{display:none}
    main{overflow:hidden}
    section{padding:54px 0}
    .hero{padding:42px 0 28px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
    .hero-copy,.hero-panel,.card,.info-box,.form-box,.faq-item,.review-card,.case-card,.article-card,.price-card,.compare-table,.timeline,.network-card,.help-card{
      background:rgba(255,255,255,.86);
      border:1px solid rgba(219,227,239,.9);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-copy{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:linear-gradient(135deg,rgba(58,99,255,.12),rgba(122,92,255,.12));color:#2940aa;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.08;letter-spacing:-.5px}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:62ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:13px 18px;border-radius:14px;border:1px solid var(--line);
      background:#fff;color:var(--text);font-weight:700;transition:.25s ease;cursor:pointer
    }
    .btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand3));color:#fff;border-color:transparent}
    .btn:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(0,0,0,.08)}
    .hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .metric{padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff, #f8fbff);border:1px solid var(--line)}
    .metric strong{display:block;font-size:24px;line-height:1;color:#20304d}
    .metric span{display:block;margin-top:6px;font-size:13px;color:var(--muted);line-height:1.5}
    .hero-panel{padding:24px;display:flex;flex-direction:column;gap:14px;justify-content:space-between;background:
      linear-gradient(180deg, rgba(58,99,255,.06), rgba(255,255,255,.92)),
      linear-gradient(135deg, #fff, #f9fbff);
    }
    .panel-tile{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .panel-tile h3{margin:0 0 8px;font-size:18px}
    .panel-tile p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 11px;border-radius:999px;background:#f4f7ff;border:1px solid #dce4ff;color:#3451c6;font-size:13px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:20px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:72ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .card{padding:22px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .card ul{margin:0;padding-left:18px}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(58,99,255,.12),rgba(255,138,91,.12));
      color:#3148af;font-weight:900;margin-bottom:14px
    }
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .image-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .image-grid img,.wide-images img{width:100%;border-radius:18px;border:1px solid var(--line);box-shadow:0 12px 28px rgba(0,0,0,.06)}
    .wide-images{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .steps{counter-reset:step}
    .step{position:relative;padding-left:58px}
    .step:before{
      counter-increment:step;content:counter(step);
      position:absolute;left:18px;top:22px;width:28px;height:28px;border-radius:50%;
      display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand3));color:#fff;font-weight:800
    }
    .table-wrap{overflow-x:auto;border-radius:22px}
    table{width:100%;border-collapse:collapse;min-width:760px;background:#fff}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f7f9ff;color:#20304d;font-size:14px}
    td{color:var(--muted);font-size:14px;line-height:1.7}
    .badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eef4ff;color:#2f4bc7;font-size:12px;font-weight:700}
    .score{font-size:34px;font-weight:900;color:#17306a}
    .reviews .review-card{padding:22px}
    .review-top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .review-name{font-weight:800}
    .review-role{font-size:13px;color:var(--muted)}
    .stars{color:#ff9b3f;letter-spacing:2px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;background:transparent;border:0;padding:18px 20px;font:inherit;text-align:left;display:flex;justify-content:space-between;gap:16px;align-items:center;color:var(--text);cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{padding-bottom:18px}
    .faq-item.open .faq-q{border-bottom:1px solid var(--line)}
    .faq-item.open .faq-arrow{transform:rotate(180deg)}
    .faq-arrow{transition:transform .25s ease}
    .article-list,.link-list{display:grid;gap:12px}
    .article-card{padding:18px 20px}
    .article-card a{font-weight:700}
    .article-card p{margin:8px 0 0;color:var(--muted);line-height:1.7}
    .form-box{padding:24px}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700;color:#30405f}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);
      padding:13px 14px;font:inherit;outline:none;transition:border-color .2s ease,box-shadow .2s ease
    }
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8cabff;box-shadow:0 0 0 4px rgba(58,99,255,.10)}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
    .footer{
      padding:28px 0 36px;border-top:1px solid rgba(219,227,239,.8);
      background:linear-gradient(180deg, rgba(255,255,255,.88), rgba(248,250,255,.96));
      color:var(--text)
    }
    .footer a{color:#1f4bd6}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px}
    .footer small,.footer p{color:var(--muted);line-height:1.7}
    .mini-list{display:grid;gap:10px}
    .mini-list a{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fff}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand3));color:#fff;box-shadow:0 16px 28px rgba(58,99,255,.28)
    }
    .chat-box{
      position:fixed;right:16px;bottom:82px;z-index:59;width:min(320px,calc(100vw - 32px));
      background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);
      padding:16px;display:none
    }
    .chat-box.open{display:block}
    .chat-box h4{margin:0 0 8px}
    .chat-box p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .chat-box .qr{margin-top:12px;padding:12px;border-radius:16px;background:#f8fbff;border:1px dashed #cfd9ff;text-align:center}
    .reveal{opacity:0;transform:translateY(18px);transition:.55s ease}
    .reveal.show{opacity:1;transform:translateY(0)}
    .service-net{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .timeline{padding:24px}
    .timeline-item{display:grid;grid-template-columns:24px 1fr;gap:14px;padding:12px 0}
    .timeline-dot{width:12px;height:12px;border-radius:50%;margin-top:7px;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 0 0 6px rgba(58,99,255,.08)}
    .compare-card{display:grid;gap:12px}
    .muted{color:var(--muted)}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.split,.grid-3,.grid-4,.footer-grid,.service-net{grid-template-columns:1fr}
      .hero-metrics,.form-grid,.wide-images,.image-grid{grid-template-columns:1fr 1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:68px;flex-direction:column;align-items:stretch;
        background:rgba(255,255,255,.98);padding:14px;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)
      }
      .nav.open{position:relative}
    }
    @media (max-width: 640px){
      section{padding:40px 0}
      .hero-copy,.hero-panel,.card,.form-box{padding:20px}
      .hero-metrics,.form-grid,.wide-images,.image-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .mobile-only{display:block}
      h1{font-size:30px}
    }