:root{
      --bg:#f4f8ff;
      --bg2:#fff9f0;
      --card:#ffffff;
      --text:#1f2a37;
      --muted:#5b6677;
      --line:#dbe5f3;
      --primary:#246bff;
      --primary2:#17b3a3;
      --accent:#ff8a3d;
      --shadow:0 18px 40px rgba(36,107,255,.10);
      --radius:22px;
      --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:linear-gradient(180deg,var(--bg),#ffffff 42%,var(--bg2));color:var(--text)}
    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:50;background:rgba(244,248,255,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,229,243,.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;box-shadow:0 10px 24px rgba(36,107,255,.12)}
    .brand strong{display:block;font-size:18px;line-height:1.1}
    .brand span{display:block;color:var(--muted);font-size:12px;margin-top:2px}
    .nav-links{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .nav-links a,.nav-links button{border:1px solid transparent;background:#fff;color:var(--text);padding:9px 13px;border-radius:999px;font-size:14px;box-shadow:0 8px 18px rgba(16,24,40,.05)}
    .nav-links a.primary,.nav-links button.primary{background:linear-gradient(135deg,var(--primary),#5d8dff);color:#fff}
    .menu-btn{display:none}
    .hero{padding:46px 0 24px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.panel,.card,.faq-item,.review,.step,.article,.case,.compare,.form-box,.mini-box{background:var(--card);border:1px solid rgba(219,229,243,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:34px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{content:"";position:absolute;border-radius:999px;background:radial-gradient(circle, rgba(36,107,255,.14), rgba(36,107,255,0) 68%)}
    .hero-main:before{width:280px;height:280px;right:-80px;top:-80px}
    .hero-main:after{width:220px;height:220px;left:-80px;bottom:-90px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(36,107,255,.08);color:var(--primary);font-size:13px;font-weight:700}
    h1{font-size:clamp(32px,5vw,54px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.03em}
    .hero p{color:var(--muted);font-size:16px;line-height:1.8;margin:0}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .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:.22s ease}
    .btn:hover,.nav-links a:hover,.nav-links button:hover,.card:hover,.review:hover,.case:hover,.article:hover,.step:hover,.faq-item:hover{transform:translateY(-2px)}
    .btn.primary{background:linear-gradient(135deg,var(--primary),#5d8dff);color:#fff}
    .btn.secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .hero-side{padding:22px}
    .metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .metric{padding:18px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#eef5ff);border:1px solid #e4ecfa}
    .metric b{display:block;font-size:26px;margin-bottom:8px}
    .metric span{color:var(--muted);font-size:13px;line-height:1.5}
    section{padding:22px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:680px;line-height:1.7}
    .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,.step h3,.case h3,.review h3,.article h3{margin:0 0 10px;font-size:18px}
    .card p,.step p,.case p,.review p,.article p,.mini-box p{margin:0;color:var(--muted);line-height:1.75}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#41506a;font-size:13px}
    .panel{padding:22px}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;padding:14px;border-radius:16px;background:#f8fbff;border:1px solid #e4ecfa}
    .dot{width:12px;height:12px;border-radius:50%;margin-top:6px;background:linear-gradient(135deg,var(--primary),var(--primary2))}
    .table-wrap{overflow-x:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2fa;text-align:left;vertical-align:top}
    th{background:#f6f9ff;color:#24324a}
    .price-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
    .price{padding:18px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(180deg,#fff,#f7fbff)}
    .price b{display:block;font-size:22px;margin:10px 0 6px}
    .price small{color:var(--muted)}
    .faq{display:grid;gap:12px}
    .faq-item{padding:18px}
    .faq-q{display:flex;justify-content:space-between;align-items:center;gap:12px;cursor:pointer}
    .faq-q strong{font-size:16px}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
    .faq-item.open .faq-a{max-height:180px}
    .faq-a p{padding-top:12px;color:var(--muted);line-height:1.75;margin:0}
    .reviews,.articles,.cases,.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px;color:var(--muted);font-size:13px}
    .stars{color:#f7a11a;letter-spacing:2px}
    .form-box{padding:22px}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    input,select,textarea{width:100%;padding:13px 14px;border-radius:14px;border:1px solid #d8e2f0;background:#fff;color:var(--text);font:inherit;outline:none}
    textarea{min-height:120px;resize:vertical}
    .full{grid-column:1/-1}
    .footer{padding:24px 0 34px;color:#334155}
    .footer-inner{padding:20px 0 0;border-top:1px solid rgba(219,229,243,.9);display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer a{color:#1d4ed8}
    .floating{position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px}
    .floating a,.backtop{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),#5d8dff);color:#fff;box-shadow:0 16px 28px rgba(36,107,255,.22);border:none}
    .backtop{cursor:pointer}
    .brand-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .badge{padding:8px 11px;border-radius:999px;background:#eef6ff;color:#2152c9;font-size:12px;border:1px solid #d8e6ff}
    .scroll-fade{opacity:0;transform:translateY(16px);transition:.55s ease}
    .scroll-fade.in{opacity:1;transform:translateY(0)}
    @media (max-width: 960px){
      .hero-grid,.grid-3,.grid-2,.reviews,.articles,.cases,.steps,.price-grid,.footer-inner{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .nav.open .nav-links{display:flex;position:absolute;left:16px;right:16px;top:68px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
      .nav{position:relative}
      .form-grid{grid-template-columns:1fr}
    }