:root{
      --bg:#f6f8fc;--panel:#ffffff;--panel2:#f3f7ff;--text:#142033;--muted:#5f6b81;--line:#dce4f2;
      --brand:#4f46e5;--brand2:#00c2ff;--brand3:#a855f7;--ok:#17a34a;--shadow:0 18px 50px rgba(22,39,88,.10);
      --radius:22px;--radius2:16px;--max:1180px;
    }
    *{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at 15% 10%, rgba(79,70,229,.10), transparent 22%),
      radial-gradient(circle at 85% 0%, rgba(0,194,255,.10), transparent 20%),
      linear-gradient(180deg,#f9fbff 0%,#f5f8fd 40%,#f7f9ff 100%);color:var(--text)}
    a{color:inherit;text-decoration:none} img{display:block;max-width:100%}
    .container{max-width:var(--max);margin:0 auto;padding:0 20px}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(246,248,252,.78);backdrop-filter:blur(16px);border-bottom:1px solid rgba(220,228,242,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:74px}
    .brand{display:flex;align-items:center;gap:12px;font-weight:800}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:0 8px 24px rgba(79,70,229,.12)}
    .brand strong{display:block;font-size:18px;letter-spacing:.5px}
    .brand span{display:block;font-size:12px;color:var(--muted);font-weight:600}
    .navlinks{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .navlinks a{padding:9px 12px;border-radius:999px;color:#2a3550;font-size:14px}
    .navlinks a:hover,.navlinks a:focus{background:rgba(79,70,229,.08);color:var(--brand)}
    .nav-cta{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;transition:.25s ease;cursor:pointer;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand) 0%,var(--brand2) 100%);color:#fff;box-shadow:0 14px 28px rgba(79,70,229,.22)}
    .btn-secondary{background:#fff;border-color:var(--line);color:#20304a}
    .btn:hover{transform:translateY(-1px);box-shadow:0 12px 24px rgba(24,39,75,.10)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    header,main,footer{position:relative}
    .hero{padding:34px 0 22px}
    .hero-grid{display:grid;grid-template-columns:1.16fr .84fr;gap:22px;align-items:stretch}
    .hero-card,.section-card{background:linear-gradient(180deg,rgba(255,255,255,.92),rgba(255,255,255,.98));border:1px solid rgba(220,228,242,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-card{padding:34px;overflow:hidden;position:relative}
    .hero-card:before{content:"";position:absolute;inset:auto -80px -90px auto;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle, rgba(0,194,255,.18), transparent 62%);pointer-events:none}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(79,70,229,.08);color:var(--brand);font-weight:700;font-size:13px}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,52px);line-height:1.1;letter-spacing:-.02em}
    .lead{color:var(--muted);font-size:16px;line-height:1.8;max-width:60ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 16px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}
    .mini{background:rgba(247,249,255,.9);border:1px solid var(--line);border-radius:18px;padding:14px}
    .mini b{display:block;font-size:18px;color:var(--text);margin-bottom:4px}
    .mini span{color:var(--muted);font-size:13px;line-height:1.55}
    .hero-side{display:grid;gap:14px}
    .panel{padding:22px;border-radius:var(--radius);background:linear-gradient(180deg,#fff, #f7faff);border:1px solid var(--line);box-shadow:var(--shadow)}
    .panel h2,.section-head h2{margin:0 0 10px;font-size:26px}
    .section-head p{margin:0;color:var(--muted);line-height:1.7}
    .metric-grid,.service-grid,.case-grid,.review-grid,.article-grid,.faq-grid,.network-grid,.compare-grid,.flow-grid,.tag-grid{display:grid;gap:16px}
    .metric-grid{grid-template-columns:repeat(4,1fr)}
    .metric{padding:20px;border-radius:20px;background:linear-gradient(135deg,rgba(79,70,229,.06),rgba(0,194,255,.05));border:1px solid rgba(79,70,229,.10)}
    .metric strong{display:block;font-size:30px;line-height:1;color:#13213c}
    .metric span{display:block;margin-top:8px;color:var(--muted);font-size:14px}
    .section{padding:18px 0}
    .section-card{padding:26px}
    .service-grid{grid-template-columns:repeat(3,1fr)}
    .service,.case,.review,.article,.help-item{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;transition:transform .25s ease, box-shadow .25s ease,border-color .25s ease}
    .service:hover,.case:hover,.review:hover,.article:hover,.help-item:hover{transform:translateY(-3px);box-shadow:0 16px 34px rgba(24,39,75,.10);border-color:rgba(79,70,229,.22)}
    .service h3,.case h3,.review h3,.article h3,.help-item h3{margin:0 0 8px;font-size:18px}
    .service p,.case p,.review p,.article p,.help-item p{margin:0;color:var(--muted);line-height:1.75;font-size:14px}
    .chiprow{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
    .chip{padding:7px 10px;border-radius:999px;background:#f2f6ff;color:#2d3b56;font-size:12px;font-weight:700;border:1px solid #dfe7f5}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .steps{counter-reset:s}
    .step{display:flex;gap:14px;align-items:flex-start;padding:18px;background:#fff;border:1px solid var(--line);border-radius:20px}
    .step:before{counter-increment:s;content:counter(s);display:grid;place-items:center;flex:0 0 38px;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800}
    .step h3{margin:0 0 6px}
    table{width:100%;border-collapse:separate;border-spacing:0;overflow:hidden}
    .table-wrap{overflow:auto;border:1px solid var(--line);border-radius:20px;background:#fff}
    th,td{padding:14px 12px;text-align:left;border-bottom:1px solid #edf1f7;vertical-align:top;font-size:14px}
    th{background:#f7faff;color:#20304a;font-size:13px}
    tr:last-child td{border-bottom:none}
    .rating{display:flex;align-items:center;gap:10px;margin:8px 0 14px;color:#20304a;font-weight:700}
    .stars{color:#f59e0b;letter-spacing:2px}
    .faq-grid{grid-template-columns:1fr 1fr}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:0 16px}
    summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700;color:#1b2944}
    summary::-webkit-details-marker{display:none}
    details p{padding:0 0 16px;margin:0;color:var(--muted);line-height:1.8}
    .review-grid{grid-template-columns:repeat(3,1fr)}
    .review .meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
    .review .role{color:var(--brand);font-size:13px;font-weight:700}
    .article-grid{grid-template-columns:repeat(3,1fr)}
    .article .time{margin-top:10px;color:#7b879b;font-size:12px}
    .tag-grid{grid-template-columns:repeat(6,1fr)}
    .tag{padding:14px 12px;text-align:center;background:linear-gradient(180deg,#fff,#f7faff);border:1px solid var(--line);border-radius:16px;font-weight:700;color:#21324b}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .form-control{display:flex;flex-direction:column;gap:8px}
    label{font-size:13px;font-weight:700;color:#263750}
    input,select,textarea{width:100%;border:1px solid #d7e0ee;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:.2s}
    textarea{min-height:118px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(79,70,229,.45);box-shadow:0 0 0 4px rgba(79,70,229,.08)}
    .form-full{grid-column:1/-1}
    .foot{margin-top:16px;background:#0f172a;color:#d7e3ff}
    .foot a{color:#ffffff}
    .foot .container{padding-top:34px;padding-bottom:24px}
    .foot-grid{display:grid;grid-template-columns:1.1fr .9fr .9fr;gap:18px;align-items:start}
    .foot h3,.foot h4{margin:0 0 12px;color:#fff}
    .foot p,.foot li{color:#c8d4f1;line-height:1.8;font-size:14px}
    .foot ul{margin:0;padding-left:18px}
    .subfoot{border-top:1px solid rgba(255,255,255,.12);margin-top:20px;padding-top:16px;display:flex;gap:10px;justify-content:space-between;flex-wrap:wrap;color:#a9b7d8;font-size:13px}
    .floatbar{position:fixed;right:18px;bottom:18px;z-index:80;display:flex;flex-direction:column;gap:10px}
    .floatbar a,.floatbar button{border:none;border-radius:999px;box-shadow:0 14px 28px rgba(15,23,42,.15);padding:12px 14px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:700}
    .backtop{display:none}
    .mobile-panel{display:none}
    .fade{opacity:0;transform:translateY(18px);transition:all .6s ease}
    .fade.in{opacity:1;transform:none}
    .image-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .image-row img{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    @media (max-width: 1080px){
      .hero-grid,.two-col,.metric-grid,.service-grid,.review-grid,.article-grid,.tag-grid,.foot-grid{grid-template-columns:1fr 1fr}
      .faq-grid{grid-template-columns:1fr}
    }
    @media (max-width: 820px){
      .menu-btn{display:inline-flex}
      .navlinks,.nav-cta .btn-secondary{display:none}
      .mobile-panel{display:none;padding:0 0 16px}
      .mobile-panel.open{display:block}
      .mobile-panel .navlinks{display:flex;flex-direction:column;align-items:stretch}
      .mobile-panel .navlinks a{background:#fff;border:1px solid var(--line)}
      .hero-grid,.two-col,.metric-grid,.service-grid,.review-grid,.article-grid,.tag-grid,.foot-grid,.form-grid,.image-row{grid-template-columns:1fr}
      .hero-card{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .floatbar{right:12px;bottom:12px}
    }