:root{
      --bg:#f5f8ff;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5c6780;
      --line:#dbe4f5;
      --brand:#2563eb;
      --brand2:#22c55e;
      --brand3:#f59e0b;
      --shadow:0 18px 40px rgba(20,35,70,.08);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:radial-gradient(circle at top left,#ffffff 0%,#f4f8ff 42%,#eef5ff 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(--container),calc(100% - 32px));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.85);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,228,245,.85)}
    .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:4px;box-shadow:0 8px 18px rgba(37,99,235,.12)}
    .brand h2{margin:0;font-size:18px;line-height:1.2}
    .brand small{display:block;color:var(--muted);font-size:12px;margin-top:2px}
    .navlinks{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .navlinks a{font-size:14px;color:var(--text);padding:8px 10px;border-radius:999px;transition:.2s ease}
    .navlinks a:hover,.navlinks a:focus{background:#eaf1ff;color:var(--brand)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px}
    .hero{padding:34px 0 20px}
    .hero-wrap{display:grid;grid-template-columns:1.28fr .72fr;gap:22px;align-items:stretch}
    .hero-main{position:relative;overflow:hidden;background:linear-gradient(135deg,#ffffff 0%,#eff5ff 50%,#e8f6ff 100%);border:1px solid #dbe7ff;border-radius:28px;padding:34px;box-shadow:var(--shadow)}
    .hero-main:before,.hero-main:after{content:"";position:absolute;border-radius:999px;filter:blur(2px);opacity:.9}
    .hero-main:before{width:180px;height:180px;right:-52px;top:-48px;background:radial-gradient(circle,#7dd3fc 0%,rgba(125,211,252,0) 68%)}
    .hero-main:after{width:220px;height:220px;left:-78px;bottom:-96px;background:radial-gradient(circle,#93c5fd 0%,rgba(147,197,253,0) 68%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;background:#e8f2ff;color:#1d4ed8;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,50px);line-height:1.1;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:56ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;border:1px solid transparent;font-weight:700;transition:.2s ease;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f8cff);color:#fff;box-shadow:0 14px 26px rgba(37,99,235,.22)}
    .btn-secondary{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover{transform:translateY(-2px);box-shadow:0 12px 24px rgba(16,24,40,.12)}
    .hero-side{display:grid;gap:14px}
    .stat-grid,.feature-grid,.case-grid,.review-grid,.info-grid,.timeline,.tags,.footer-grid{display:grid;gap:14px}
    .stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .panel,.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .stat{padding:18px}
    .stat strong{display:block;font-size:26px;line-height:1.1;margin-bottom:6px}
    .stat span{color:var(--muted);font-size:13px}
    .hero-mini{padding:18px}
    .hero-mini h3{margin:0 0 8px;font-size:16px}
    .hero-mini ul{margin:0;padding-left:18px;color:var(--muted)}
    section{padding:18px 0}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:14px}
    .section-title h2{margin:0;font-size:clamp(22px,2.5vw,32px)}
    .section-title p{margin:0;color:var(--muted);max-width:62ch}
    .feature-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .card{padding:20px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted)}
    .tag{display:inline-flex;align-items:center;padding:7px 11px;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-size:13px;margin:0 8px 8px 0}
    .workflow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{position:relative;overflow:hidden}
    .step:after{content:attr(data-step);position:absolute;right:16px;top:14px;font-size:38px;font-weight:800;color:#dbe7ff}
    .compare{overflow:auto}
    table{width:100%;border-collapse:collapse;min-width:860px;background:#fff}
    th,td{padding:14px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f2f7ff;font-size:14px}
    .score{font-size:30px;font-weight:800;color:#0f766e}
    .grid-two{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .faq details{border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow);overflow:hidden}
    .faq summary{list-style:none;padding:16px 18px;font-weight:700;cursor:pointer}
    .faq summary::-webkit-details-marker{display:none}
    .faq .answer{padding:0 18px 16px;color:var(--muted)}
    .reviews .review{border-left:4px solid #7aa7ff}
    .review .meta{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:10px}
    .articles a{display:flex;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px dashed var(--line);color:var(--text)}
    .articles a:last-child{border-bottom:0}
    .articles span{color:var(--muted)}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:grid;gap:8px}
    input,select,textarea{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);font:inherit;outline:none}
    textarea{min-height:132px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#7aa7ff;box-shadow:0 0 0 4px rgba(122,167,255,.15)}
    .full{grid-column:1/-1}
    .footer{margin-top:8px;padding:22px 0 28px;background:#f8fbff;border-top:1px solid var(--line);color:var(--text)}
    .footer-grid{grid-template-columns:1.15fr 1fr 1fr}
    .footer a{color:var(--brand)}
    .footer small,.footer p{color:var(--muted)}
    .floating{position:fixed;right:16px;bottom:18px;z-index:50;display:grid;gap:10px}
    .float-btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);color:var(--text);font-weight:700}
    .backtop{opacity:0;transform:translateY(12px);pointer-events:none;transition:.25s ease}
    .backtop.show{opacity:1;transform:translateY(0);pointer-events:auto}
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .media-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .media-grid img{width:100%;height:auto}
    .labels{display:flex;flex-wrap:wrap;gap:8px}
    .labels span{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--text);font-size:13px}
    .service-net{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .mini-note{font-size:13px;color:var(--muted)}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-wrap,.feature-grid,.workflow,.grid-two,.footer-grid,.service-net,.media-grid{grid-template-columns:1fr}
      .stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .navlinks{display:none}
      .nav-toggle{display:inline-flex}
      .navlinks.open{display:flex;position:absolute;left:16px;right:16px;top:68px;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
      .topbar{position:sticky}
      .mobile-only{display:block}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container),calc(100% - 22px))}
      .hero-main{padding:24px}
      .stat-grid,.form-grid{grid-template-columns:1fr}
      .hero-actions{flex-direction:column}
      .btn{width:100%}
      h1{font-size:30px}
      .section-title{flex-direction:column;align-items:flex-start}
      table{min-width:760px}
    }
    .reveal{opacity:0;transform:translateY(14px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}