:root{
      --bg:#f7f8fb;
      --panel:#ffffff;
      --panel-2:#f3f6ff;
      --text:#182230;
      --muted:#5e6b7b;
      --line:#dbe3ef;
      --primary:#315efb;
      --primary-2:#8d53ff;
      --accent:#13b8a6;
      --warm:#ffb44d;
      --shadow:0 18px 50px rgba(31,54,99,.10);
      --shadow-soft:0 10px 24px rgba(31,54,99,.08);
      --radius:20px;
      --radius-sm:14px;
      --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;
      background:
        radial-gradient(circle at top left, rgba(49,94,251,.11), transparent 28%),
        radial-gradient(circle at 80% 0%, rgba(141,83,255,.12), transparent 26%),
        linear-gradient(180deg,#fbfcff 0%, #f6f8fc 48%, #f7f8fb 100%);
      color:var(--text);
      line-height:1.65;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{
      width:min(var(--container), calc(100% - 32px));
      margin:0 auto;
    }
    header{
      position:sticky;
      top:0;
      z-index:30;
      backdrop-filter: blur(14px);
      background: rgba(251,252,255,.82);
      border-bottom:1px solid rgba(219,227,239,.78);
    }
    .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:var(--shadow-soft)
    }
    .brand-name{display:flex;flex-direction:column;min-width:0}
    .brand-name strong{font-size:1.02rem;letter-spacing:.2px}
    .brand-name span{font-size:.82rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .nav-links{
      display:flex;
      align-items:center;
      gap:8px;
      flex-wrap:wrap;
      justify-content:center;
    }
    .nav-links a,.nav-links button{
      border:1px solid transparent;
      background:transparent;
      color:var(--text);
      padding:10px 12px;
      border-radius:999px;
      font-size:.92rem;
      cursor:pointer;
      transition:.22s ease;
    }
    .nav-links a:hover,.nav-links button:hover{background:#eef3ff;border-color:#d9e4ff;color:#2141c7}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      padding:12px 16px;
      border-radius:999px;
      border:1px solid transparent;
      font-weight:700;
      transition:.24s ease;
      cursor:pointer;
      white-space:nowrap;
    }
    .btn-primary{
      background:linear-gradient(135deg,var(--primary),var(--primary-2));
      color:#fff;
      box-shadow:0 12px 28px rgba(49,94,251,.25);
    }
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 34px rgba(49,94,251,.28)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:#b9c9ef;background:#f6f9ff}
    .menu-toggle{
      display:none;
      width:44px;height:44px;
      border-radius:14px;
      border:1px solid var(--line);
      background:#fff;
      align-items:center;
      justify-content:center;
    }
    .menu-toggle span{display:block;width:18px;height:2px;background:#30405a;position:relative}
    .menu-toggle span::before,.menu-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:#30405a}
    .menu-toggle span::before{top:-6px}.menu-toggle span::after{top:6px}
    main{overflow:hidden}
    section{padding:72px 0}
    .hero{
      padding:48px 0 34px;
      position:relative;
    }
    .hero-grid{
      display:grid;
      grid-template-columns: 1.12fr .88fr;
      gap:24px;
      align-items:stretch;
    }
    .hero-card,.panel,.feature-card,.review-card,.case-card,.faq-item,.article-card,.price-card,.timeline-card{
      background:rgba(255,255,255,.88);
      border:1px solid rgba(219,227,239,.92);
      box-shadow:var(--shadow-soft);
      border-radius:var(--radius);
    }
    .hero-card{
      padding:34px;
      position:relative;
      overflow:hidden;
      background:
        linear-gradient(135deg, rgba(255,255,255,.98), rgba(240,246,255,.92));
    }
    .hero-card::before{
      content:"";
      position:absolute;
      inset:-40% -25% auto auto;
      width:280px;height:280px;border-radius:50%;
      background:radial-gradient(circle, rgba(49,94,251,.18), transparent 68%);
      pointer-events:none;
    }
    .hero-card::after{
      content:"";
      position:absolute;
      inset:auto auto -70px -60px;
      width:240px;height:240px;border-radius:50%;
      background:radial-gradient(circle, rgba(19,184,166,.16), transparent 68%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      background:linear-gradient(135deg,#eef4ff,#f4efff);
      color:#2944ad;
      border:1px solid #d9e2ff;
      padding:8px 12px;
      border-radius:999px;
      font-size:.9rem;
      font-weight:700;
    }
    h1{font-size:clamp(2rem,4vw,3.45rem);line-height:1.12;margin:16px 0 14px;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:1.02rem;max-width:64ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:12px;
      margin-top:26px;
    }
    .point{
      padding:14px;
      border-radius:16px;
      background:#fff;
      border:1px solid var(--line);
    }
    .point strong{display:block;font-size:1.05rem}
    .point span{color:var(--muted);font-size:.88rem}
    .hero-side{
      display:grid;
      gap:16px;
    }
    .side-top{
      padding:22px;
      display:grid;
      gap:14px;
      background:linear-gradient(180deg,#ffffff,#f8fbff);
    }
    .metrics{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:12px;
    }
    .metric{
      padding:16px;
      border-radius:18px;
      background:linear-gradient(180deg,#ffffff,#f6f9ff);
      border:1px solid var(--line);
    }
    .metric strong{display:block;font-size:1.45rem;line-height:1.1}
    .metric span{font-size:.88rem;color:var(--muted)}
    .cta-note{
      padding:16px 18px;
      border-radius:18px;
      background:linear-gradient(135deg, rgba(49,94,251,.08), rgba(19,184,166,.08));
      border:1px solid #d9e9ff;
    }
    .cta-note strong{display:block;margin-bottom:4px}
    .cta-note span{color:var(--muted);font-size:.92rem}
    .section-head{
      display:flex;
      justify-content:space-between;
      gap:16px;
      align-items:end;
      margin-bottom:24px;
    }
    .section-head h2{margin:0;font-size:clamp(1.55rem,2.8vw,2.4rem);line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:64ch}
    .grid-3{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:16px;
    }
    .grid-4{
      display:grid;
      grid-template-columns:repeat(4,minmax(0,1fr));
      gap:16px;
    }
    .feature-card,.case-card,.review-card,.article-card,.price-card,.timeline-card,.panel{padding:22px}
    .feature-card h3,.case-card h3,.review-card h3,.article-card h3,.price-card h3,.timeline-card h3{margin:10px 0 8px;font-size:1.08rem}
    .icon{
      width:44px;height:44px;border-radius:14px;
      display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(49,94,251,.11), rgba(141,83,255,.12));
      color:#2444bc;
      font-weight:800;
      border:1px solid #dbe7ff;
    }
    .muted{color:var(--muted)}
    .chip-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .chip{
      padding:9px 12px;
      border-radius:999px;
      background:#fff;
      border:1px solid var(--line);
      font-size:.92rem;
    }
    .process{
      display:grid;
      grid-template-columns:repeat(4,minmax(0,1fr));
      gap:16px;
      counter-reset: step;
    }
    .step{
      padding:22px;
      border-radius:var(--radius);
      background:linear-gradient(180deg,#ffffff,#f8fbff);
      border:1px solid var(--line);
      position:relative;
    }
    .step::before{
      counter-increment: step;
      content:"0" counter(step);
      position:absolute;
      top:18px;right:18px;
      font-size:.9rem;font-weight:800;color:#94a3b8;
    }
    .step .icon{margin-bottom:10px}
    .compare-wrap{overflow:auto;border-radius:var(--radius);border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-soft)}
    table{width:100%;border-collapse:collapse;min-width:860px;background:#fff}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f4f7ff;color:#203056;font-size:.95rem}
    tbody tr:hover{background:#fbfdff}
    .rating{
      display:inline-flex;
      align-items:center;
      gap:6px;
      padding:8px 12px;
      border-radius:999px;
      background:#fff7e8;
      color:#9a5c00;
      border:1px solid #ffe1ab;
      font-weight:700;
    }
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%;
      text-align:left;
      border:0;
      background:transparent;
      padding:18px 20px;
      font-size:1rem;
      font-weight:700;
      color:var(--text);
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:12px;
      cursor:pointer;
    }
    .faq-q span{color:#28407e}
    .faq-a{
      max-height:0;
      overflow:hidden;
      transition:max-height .28s ease;
      border-top:1px solid transparent;
    }
    .faq-a p{margin:0;padding:0 20px 18px;color:var(--muted)}
    .faq-item.open .faq-a{max-height:180px;border-top-color:var(--line)}
    .faq-item.open .faq-q .chev{transform:rotate(180deg)}
    .chev{transition:transform .22s ease}
    .comments .review-card{height:100%}
    .stars{color:#f59e0b;font-size:1.02rem;letter-spacing:1px}
    .review-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:12px;color:var(--muted);font-size:.92rem}
    .case-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px}
    .case-highlight{
      padding:26px;
      border-radius:var(--radius);
      background:linear-gradient(135deg, #101c36, #22468f 55%, #4d2ea2);
      color:#fff;
      box-shadow:var(--shadow);
    }
    .case-highlight p,.case-highlight li{color:rgba(255,255,255,.88)}
    .case-list{display:grid;gap:14px}
    .case-mini{
      padding:18px;
      border-radius:18px;
      border:1px solid var(--line);
      background:#fff;
    }
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article-card .tag{
      display:inline-flex;
      padding:7px 10px;
      border-radius:999px;
      background:#eef5ff;
      color:#2450d8;
      font-size:.86rem;
      margin-bottom:12px;
    }
    .form-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:16px;
    }
    .form-card{
      padding:26px;
      border-radius:var(--radius);
      background:linear-gradient(180deg,#ffffff,#f8fbff);
      border:1px solid var(--line);
      box-shadow:var(--shadow-soft);
    }
    .field{display:grid;gap:8px}
    .field label{font-weight:700;font-size:.95rem}
    .field input,.field select,.field textarea{
      width:100%;
      border:1px solid #ced8e8;
      background:#fff;
      color:var(--text);
      border-radius:14px;
      padding:13px 14px;
      outline:none;
      transition:.2s ease;
      font:inherit;
    }
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#7692f6;box-shadow:0 0 0 4px rgba(49,94,251,.1)}
    .field textarea{min-height:132px;resize:vertical}
    .footer{
      padding:34px 0 28px;
      background:#0f1728;
      color:#d7e0ee;
      margin-top:28px;
    }
    .footer a{color:#eff4ff}
    .footer-grid{
      display:grid;
      grid-template-columns:1.2fr .8fr .9fr;
      gap:18px;
      align-items:start;
    }
    .footer small,.footer p,.footer li{color:#b9c4d6}
    .footer .chip{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.12);color:#e6eefb}
    .footer-bottom{
      margin-top:22px;
      padding-top:18px;
      border-top:1px solid rgba(255,255,255,.12);
      display:flex;
      justify-content:space-between;
      gap:12px;
      flex-wrap:wrap;
      font-size:.92rem;
    }
    .float-tools{
      position:fixed;
      right:18px;
      bottom:18px;
      display:grid;
      gap:10px;
      z-index:40;
    }
    .float-tools a,.float-tools button{
      width:52px;height:52px;
      border-radius:16px;
      border:1px solid rgba(219,227,239,.9);
      background:#fff;
      box-shadow:var(--shadow-soft);
      display:grid;
      place-items:center;
      color:#28407e;
      cursor:pointer;
    }
    .floating-card{
      position:fixed;
      left:18px;
      bottom:18px;
      z-index:35;
      width:min(300px, calc(100vw - 36px));
      background:#fff;
      border:1px solid var(--line);
      border-radius:20px;
      box-shadow:var(--shadow);
      overflow:hidden;
    }
    .floating-card header{
      position:static;
      background:linear-gradient(135deg,#eff4ff,#f5efff);
      border-bottom:1px solid #e1e8f6;
      backdrop-filter:none;
    }
    .floating-card .inner{padding:14px 16px}
    .floating-card .kefu{
      display:flex;
      gap:12px;
      align-items:center;
    }
    .floating-card img{width:76px;height:76px;object-fit:cover;border-radius:14px;border:1px solid var(--line)}
    .scroll-reveal{opacity:0;transform:translateY(12px);transition:.6s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    .topline{
      display:flex;gap:10px;flex-wrap:wrap;margin-top:16px;color:var(--muted);font-size:.92rem
    }
    .divider{height:1px;background:linear-gradient(90deg,transparent,rgba(219,227,239,.95),transparent);margin:18px 0}
    .list-compact{display:grid;gap:10px;padding-left:18px;margin:0}
    .list-compact li{color:var(--muted)}
    .anchor{scroll-margin-top:96px}
    .mobile-only{display:none}
    @media (max-width: 1060px){
      .hero-grid,.case-grid,.footer-grid,.form-grid{grid-template-columns:1fr}
      .grid-4,.grid-3,.process,.article-list{grid-template-columns:repeat(2,minmax(0,1fr))}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .nav.open .nav-links{
        display:flex;
        position:absolute;
        top:74px;left:0;right:0;
        padding:14px 16px 18px;
        background:rgba(251,252,255,.98);
        border-bottom:1px solid var(--line);
        box-shadow:var(--shadow-soft);
      }
      .nav.open .nav-links a,.nav.open .nav-links button{background:#fff;border-color:var(--line)}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 720px){
      section{padding:58px 0}
      .hero{padding-top:22px}
      .hero-card{padding:24px}
      .hero-points,.metrics,.grid-4,.grid-3,.process,.article-list{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:start}
      .nav-actions .btn-ghost{display:none}
      .floating-card{display:none}
      .float-tools{right:12px;bottom:12px}
      .container{width:min(var(--container), calc(100% - 24px))}
    }