:root{
      --bg:#f5f7fb;
      --panel:#ffffff;
      --panel-2:#f8fbff;
      --text:#16304a;
      --muted:#5f728a;
      --line:#d9e3ef;
      --brand:#4f7cff;
      --brand-2:#7d5cff;
      --accent:#18b7a7;
      --warm:#ffb84d;
      --shadow:0 14px 40px rgba(22,48,74,.08);
      --shadow-2:0 20px 60px rgba(79,124,255,.14);
      --radius:20px;
      --radius-sm:14px;
      --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",sans-serif;background:
      radial-gradient(circle at top left, rgba(79,124,255,.10), transparent 26%),
      radial-gradient(circle at 90% 10%, rgba(24,183,167,.10), transparent 24%),
      linear-gradient(180deg,#f8fbff 0%,#f5f7fb 45%,#f6f8fc 100%);
      color:var(--text);line-height:1.7}
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    header{position:sticky;top:0;z-index:50;background:rgba(246,249,253,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(217,227,239,.8)}
    .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;padding:5px;box-shadow:0 8px 20px rgba(79,124,255,.12)}
    .brand strong{display:block;font-size:16px;line-height:1.15}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--text);padding:8px 10px;border-radius:10px;transition:.2s}
    .nav-links a:hover,.nav-links a:focus{background:#eef4ff;color:var(--brand)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn,.btn-outline{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;padding:12px 18px;font-weight:700;border:1px solid transparent;transition:.22s;cursor:pointer}
    .btn{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:var(--shadow-2)}
    .btn:hover{transform:translateY(-2px);box-shadow:0 18px 38px rgba(79,124,255,.22)}
    .btn-outline{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-outline:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
    .menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    main{display:block}
    section{padding:72px 0}
    .hero{padding:40px 0 58px}
    .hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:stretch}
    .hero-copy,.hero-aside,.card,.panel,.quote,.timeline li,.faq-item,.form-card,.compare-box{background:rgba(255,255,255,.88);border:1px solid rgba(217,227,239,.9);box-shadow:var(--shadow);border-radius:var(--radius)}
    .hero-copy{padding:34px;position:relative;overflow:hidden}
    .hero-copy:before{content:"";position:absolute;inset:auto -10% -30% auto;width:280px;height:280px;background:radial-gradient(circle, rgba(79,124,255,.18), transparent 65%);pointer-events:none}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#eef4ff;color:#375dcf;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,52px);line-height:1.1;letter-spacing:-.02em}
    .lead{margin:0;color:var(--muted);font-size:16px;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}
    .mini-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
    .mini-tags span{padding:8px 12px;border-radius:999px;background:#f2f6ff;border:1px solid #dfe8f8;color:#35506d;font-size:13px}
    .metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}
    .metric{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7faff);border:1px solid #e3ebf7}
    .metric strong{display:block;font-size:22px}
    .metric span{font-size:13px;color:var(--muted)}
    .hero-aside{padding:22px;display:grid;gap:14px}
    .aside-top{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .stat{padding:18px;border-radius:18px;background:linear-gradient(145deg,#f7fbff,#eef4ff);border:1px solid #dfe8fb}
    .stat strong{display:block;font-size:18px}
    .stat span{color:var(--muted);font-size:13px}
    .aside-card{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .aside-card h3{margin:0 0 8px;font-size:18px}
    .aside-card p{margin:0;color:var(--muted);font-size:14px}
    .section-head{display:flex;justify-content:space-between;gap:18px;align-items:end;margin-bottom:22px}
    .section-head h2{margin:0;font-size:clamp(24px,3vw,36px);line-height:1.2}
    .section-head p{margin:0;color:var(--muted);max-width:62ch}
    .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:12px 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);font-size:14px}
    .icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#eef4ff,#e8fbf7);color:var(--brand);font-size:20px}
    .list{margin:0;padding-left:18px}
    .pill-row{display:flex;flex-wrap:wrap;gap:10px}
    .pill-row span{border:1px solid #dbe5f3;background:#fff;padding:8px 11px;border-radius:999px;font-size:13px;color:#35506d}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .process{display:grid;gap:12px}
    .step{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start}
    .step-num{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;display:grid;place-items:center;font-weight:800}
    .table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf2f8;text-align:left;vertical-align:top}
    th{background:#f7faff;color:#18324b}
    tr:hover td{background:#fbfdff}
    .rating{display:flex;align-items:center;gap:8px;font-weight:800;color:#d58500}
    .rating .stars{letter-spacing:2px}
    .compare-box{padding:22px}
    .highlight{padding:18px;border-radius:18px;background:linear-gradient(135deg,#f7fbff,#edf7ff);border:1px solid #dce9fb}
    .quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .quote{padding:20px}
    .quote p{margin:0 0 14px;color:var(--text)}
    .quote footer{padding:0;background:none;border:none;color:var(--muted);font-size:13px}
    .timeline{list-style:none;margin:0;padding:0;display:grid;gap:14px}
    .timeline li{padding:18px 18px 18px 20px}
    .timeline strong{display:block;margin-bottom:6px}
    .faq-list{display:grid;gap:12px}
    .faq-item summary{list-style:none;cursor:pointer;padding:18px 20px;font-weight:700;display:flex;justify-content:space-between;gap:16px}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .answer{padding:0 20px 18px;color:var(--muted)}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article{padding:20px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
    .article .meta{font-size:13px;color:var(--muted);margin-bottom:8px}
    .article h3{margin:0 0 10px}
    .form-card{padding:24px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .full{grid-column:1/-1}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px}
    input,select,textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:.2s}
    input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(79,124,255,.12)}
    textarea{min-height:120px;resize:vertical}
    .form-note{font-size:13px;color:var(--muted);margin-top:10px}
    .contact-grid{display:grid;grid-template-columns:1fr .95fr;gap:18px;align-items:start}
    .contact-box{padding:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .qrcode{display:flex;align-items:center;gap:16px}
    .qrcode img{width:140px;height:140px;object-fit:cover;border-radius:18px;border:1px solid var(--line);background:#fff}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    footer{background:#0f1c2d;color:#d7e6f9;padding:28px 0 24px;margin-top:0}
    footer a{color:#9fd2ff}
    footer .container{display:grid;gap:12px}
    .footer-top{display:flex;justify-content:space-between;gap:18px;align-items:center;flex-wrap:wrap}
    .footer-bottom{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#b7c8da;font-size:13px}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .floating a,.floating button{width:48px;height:48px;border:none;border-radius:16px;display:grid;place-items:center;box-shadow:var(--shadow-2);cursor:pointer}
    .floating .kf{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
    .floating .top{background:#fff;color:var(--brand);border:1px solid var(--line)}
    .mobile-panel{display:none}
    .fade-in{opacity:0;transform:translateY(16px);transition:opacity .6s ease,transform .6s ease}
    .fade-in.show{opacity:1;transform:none}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{background:#fff;border:1px solid #dce6f3;border-radius:999px;padding:8px 12px;font-size:13px;color:#3d5874}
    .service-net{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-net .card{min-height:100%}
    .small{font-size:13px;color:var(--muted)}
    @media (max-width: 1024px){
      .hero-grid,.split,.contact-grid,.grid-4,.grid-3,.quotes,.article-list,.service-net{grid-template-columns:1fr 1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .mobile-panel{display:none;padding:0 0 16px}
      .mobile-panel.open{display:block}
      .mobile-panel a{display:block;padding:10px 0;color:var(--text);border-top:1px solid #edf2f8}
    }
    @media (max-width: 720px){
      section{padding:56px 0}
      .hero{padding-top:24px}
      .hero-grid,.split,.contact-grid,.grid-4,.grid-3,.quotes,.article-list,.service-net,.metrics,.aside-top,form{grid-template-columns:1fr}
      .hero-copy{padding:24px}
      .section-head{flex-direction:column;align-items:flex-start}
      .metrics{grid-template-columns:1fr 1fr}
      .nav-actions .btn-outline{display:none}
      .qrcode{flex-direction:column;align-items:flex-start}
      .qrcode img{width:120px;height:120px}
      .floating{right:12px;bottom:12px}
      .floating a,.floating button{width:44px;height:44px;border-radius:14px}
    }