:root{
      --bg:#f5f8ff;
      --panel:#ffffff;
      --panel-2:#f7faff;
      --line:#d9e2f2;
      --text:#162033;
      --muted:#5d6b84;
      --brand:#3b66ff;
      --brand-2:#9b5cff;
      --accent:#12b5cb;
      --shadow:0 18px 50px rgba(24, 47, 101, .10);
      --radius:20px;
      --max: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(59,102,255,.12), transparent 28%),
        radial-gradient(circle at top right, rgba(155,92,255,.10), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f5f8ff 45%, #f8fbff 100%);
    }
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--max);margin:0 auto;padding:0 20px}
    header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(18px);
      background:rgba(245,248,255,.82);
      border-bottom:1px solid rgba(217,226,242,.8);
    }
    .topbar{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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-shadow:0 10px 25px rgba(59,102,255,.12)}
    .brand h1{font-size:18px;line-height:1.1;margin:0;color:#10192a}
    .brand p{margin:4px 0 0;color:var(--muted);font-size:12px}
    nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    nav a{color:#23304a;font-size:14px;padding:8px 10px;border-radius:10px;transition:.2s}
    nav a:hover{background:rgba(59,102,255,.08);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;cursor:pointer;transition:.2s;white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 14px 30px rgba(59,102,255,.22)}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 18px 36px rgba(59,102,255,.28)}
    .btn-ghost{background:#fff;color:#22314e;border-color:var(--line)}
    .btn-ghost:hover{border-color:rgba(59,102,255,.35);color:var(--brand)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    .hero{
      padding:56px 0 28px;
      position:relative;
      overflow:hidden;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch;
    }
    .hero-copy,.hero-side,.card,.panel,.faq-item,.review,.article,.form-card,.compare-box,.metric,.timeline-item{
      background:rgba(255,255,255,.84);
      border:1px solid rgba(217,226,242,.88);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-copy{padding:32px;position:relative}
    .hero-copy::after{
      content:"";position:absolute;inset:auto -60px -60px auto;width:180px;height:180px;
      background:radial-gradient(circle, rgba(18,181,203,.24), transparent 68%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      background:rgba(59,102,255,.08);color:#2a4dd8;
      border:1px solid rgba(59,102,255,.18);
      border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700;
    }
    h2,h3{margin:0}
    .hero h2{font-size:clamp(32px,4vw,54px);line-height:1.08;margin:16px 0 16px}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:22px}
    .point{background:linear-gradient(180deg,#fff, #f6f9ff);border:1px solid var(--line);border-radius:16px;padding:14px}
    .point strong{display:block;font-size:14px;margin-bottom:4px}
    .point span{color:var(--muted);font-size:13px;line-height:1.6}
    .hero-side{padding:22px;display:grid;gap:14px}
    .metric{padding:18px;background:linear-gradient(180deg,#ffffff, #f7fbff)}
    .metric strong{display:block;font-size:24px;color:#14213b}
    .metric span{color:var(--muted);font-size:13px}
    .hero-mini{
      display:grid;grid-template-columns:repeat(2,1fr);gap:12px;
    }
    .mini{
      padding:16px;border-radius:16px;background:linear-gradient(135deg, rgba(59,102,255,.08), rgba(155,92,255,.08));
      border:1px solid rgba(59,102,255,.14);
    }
    .mini b{display:block;font-size:15px;margin-bottom:4px}
    .mini small{color:var(--muted);line-height:1.5}
    section{padding:28px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head p{margin:0;color:var(--muted);line-height:1.7}
    .section-title{font-size:28px;line-height:1.2}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .card{padding:22px}
    .card h3{font-size:18px;margin-bottom:10px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .card ul{margin:0;padding-left:18px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:999px;color:#26354d;font-size:13px}
    .process{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .step{
      position:relative;padding:20px;border-radius:18px;background:linear-gradient(180deg,#fff,#f8fbff);
      border:1px solid var(--line);
    }
    .step b{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;margin-bottom:14px}
    .step h3{font-size:16px;margin-bottom:8px}
    .step p{margin:0;color:var(--muted);line-height:1.7;font-size:14px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:920px}
    th,td{padding:16px;border-bottom:1px solid #edf2fb;text-align:left;vertical-align:top}
    th{background:linear-gradient(180deg,#f8fbff,#eef4ff);font-size:14px}
    td{color:var(--muted);line-height:1.7}
    .score{color:#0d2b7a;font-weight:800}
    details{
      background:#fff;border:1px solid var(--line);border-radius:16px;padding:0;overflow:hidden;
      box-shadow:var(--shadow)
    }
    details + details{margin-top:12px}
    summary{list-style:none;cursor:pointer;padding:18px 20px;font-weight:700;color:#17233a}
    summary::-webkit-details-marker{display:none}
    details p{padding:0 20px 18px;margin:0;color:var(--muted);line-height:1.75}
    .reviews,.articles,.timeline,.network{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review b,.article h3{display:block;margin-bottom:8px}
    .rating{color:#ff9f1a;font-size:14px;letter-spacing:1px}
    .article small,.timeline-item small{color:var(--muted)}
    .timeline-item{padding:20px}
    .timeline-item b{display:block;margin-bottom:8px}
    .form-card{padding:24px}
    form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .full{grid-column:1/-1}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px;color:#24324a}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d8e2f3;background:#fbfdff;
      color:#132033;font:inherit;outline:none;transition:.2s;
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(59,102,255,.55);box-shadow:0 0 0 4px rgba(59,102,255,.10)}
    textarea{min-height:120px;resize:vertical}
    .contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
    .contact-box{padding:22px}
    .contact-list{display:grid;gap:10px;margin-top:12px}
    .contact-item{display:flex;justify-content:space-between;gap:12px;padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:14px}
    footer{
      margin-top:28px;background:#0f1728;color:#dfe8ff;border-top:1px solid rgba(255,255,255,.08)
    }
    footer a{color:#9cc0ff}
    .footer-inner{padding:28px 0;display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:start}
    .footer-brand{display:flex;gap:12px;align-items:center}
    .footer-brand img{width:44px;height:44px;background:#fff;border-radius:12px;padding:6px}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;border:1px solid rgba(255,255,255,.12);border-radius:999px;background:rgba(255,255,255,.04)}
    .copy{border-top:1px solid rgba(255,255,255,.08);padding:14px 0;color:#b9c8ea;font-size:13px}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px;
    }
    .float-btn{
      display:flex;align-items:center;justify-content:center;gap:8px;
      background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
      border-radius:999px;padding:12px 16px;box-shadow:0 16px 36px rgba(59,102,255,.24)
    }
    .backtop{background:#fff;color:#20314f;border:1px solid var(--line)}
    .sticky-kefu{
      position:fixed;left:18px;bottom:18px;z-index:60;background:#fff;border:1px solid var(--line);
      border-radius:18px;box-shadow:var(--shadow);padding:10px;width:104px
    }
    .sticky-kefu img{border-radius:12px}
    .sticky-kefu span{display:block;text-align:center;color:#33415d;font-size:12px;margin-top:8px}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .scroll-reveal.is-visible{opacity:1;transform:none}
    .compare-box{padding:22px}
    .compare-score{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:14px}
    .compare-mini{background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line);border-radius:16px;padding:16px}
    .compare-mini strong{display:block;font-size:22px}
    .mobile-menu{display:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.process,.reviews,.articles,.timeline,.network,.contact-grid,.footer-inner{grid-template-columns:1fr}
      nav{display:none}
      .menu-btn{display:inline-flex}
      .mobile-menu{display:none;padding:0 0 14px}
      .mobile-menu.open{display:grid;gap:8px}
      .mobile-menu a{padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;color:#24324a}
      .hero{padding-top:28px}
      .hero-points,.hero-mini,.compare-score{grid-template-columns:1fr}
      form{grid-template-columns:1fr}
      .sticky-kefu{width:92px}
    }
    @media (max-width: 560px){
      .container{padding:0 16px}
      .hero-copy,.hero-side,.card,.panel,.faq-item,.review,.article,.form-card,.compare-box,.metric,.timeline-item{border-radius:18px}
      .hero-copy{padding:24px}
      .section-title{font-size:24px}
      .btn{width:100%}
      .hero-actions{flex-direction:column}
      .nav-actions{width:auto}
    }