:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f4f7ff;
      --text:#182235;
      --muted:#5c677d;
      --line:#dce3f3;
      --primary:#356dff;
      --accent:#ff7b54;
      --accent2:#18b8a6;
      --shadow:0 18px 45px rgba(28, 57, 132, .10);
      --radius:22px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left, rgba(53,109,255,.12), transparent 26%),
      radial-gradient(circle at 88% 8%, rgba(255,123,84,.12), transparent 22%),
      linear-gradient(180deg,#ffffff 0%, #f7f8fc 26%, #f4f7ff 100%);
      color:var(--text); line-height:1.65}
    a{color:var(--primary);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--container));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.84);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,227,243,.75)}
    .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 6px 18px rgba(0,0,0,.08)}
    .brand-text{display:flex;flex-direction:column;line-height:1.2}
    .brand-text strong{font-size:1.02rem}
    .brand-text span{font-size:.83rem;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:.95rem;color:var(--text);padding:8px 0;opacity:.88}
    .nav-links a:hover,.nav-links a:focus{color:var(--primary)}
    .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;cursor:pointer;transition:.25s ease;box-shadow:none}
    .btn:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(53,109,255,.18)}
    .btn-primary{background:linear-gradient(135deg,var(--primary),#6a8dff);color:#fff}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.18fr .82fr;gap:22px;align-items:stretch}
    .hero-card{background:linear-gradient(135deg,#ffffff 0%, #f7fbff 52%, #eef4ff 100%);border:1px solid rgba(220,227,243,.95);border-radius:28px;box-shadow:var(--shadow);padding:28px;position:relative;overflow:hidden}
    .hero-card:before{content:"";position:absolute;inset:auto -10% -35% auto;width:280px;height:280px;background:radial-gradient(circle, rgba(53,109,255,.18), transparent 64%);border-radius:50%}
    .badge{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#edf3ff;color:#2c56cf;font-size:.9rem;font-weight:700}
    h1{font-size:clamp(2rem,4vw,3.6rem);line-height:1.06;margin:16px 0 14px;letter-spacing:-.03em}
    .lead{font-size:1.05rem;color:var(--muted);max-width:60ch;margin:0}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:24px}
    .mini{background:rgba(255,255,255,.78);border:1px solid rgba(220,227,243,.92);border-radius:18px;padding:14px}
    .mini strong{display:block;font-size:1.05rem;margin-bottom:4px}
    .mini span{font-size:.9rem;color:var(--muted)}
    .hero-side{display:grid;gap:14px}
    .side-panel{background:var(--panel);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:20px}
    .stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .stat{background:linear-gradient(180deg,#ffffff,#f7faff);border:1px solid var(--line);border-radius:18px;padding:16px}
    .stat strong{display:block;font-size:1.55rem;color:#14306e}
    .stat span{font-size:.9rem;color:var(--muted)}
    .kefu{display:grid;grid-template-columns:104px 1fr;gap:14px;align-items:center}
    .kefu img{width:104px;border-radius:16px;border:1px solid var(--line)}
    .kefu h3{margin:0 0 8px;font-size:1.1rem}
    .kefu p{margin:0;color:var(--muted);font-size:.92rem}
    .section{padding:18px 0}
    .section h2{margin:0 0 14px;font-size:1.6rem}
    .section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:14px}
    .section-head p{margin:0;color:var(--muted)}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .card{background:var(--panel);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:18px;transition:transform .25s ease, box-shadow .25s ease}
    .card:hover{transform:translateY(-3px);box-shadow:0 20px 34px rgba(28,57,132,.14)}
    .card h3{margin:0 0 8px;font-size:1.08rem}
    .card p,.card li{color:var(--muted)}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#f0f5ff;border:1px solid #dce6ff;color:#2948aa;font-size:.9rem}
    .workflow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
    .step{position:relative;padding:18px 16px 16px 18px;background:linear-gradient(180deg,#fff, #f7fbff);border:1px solid var(--line);border-radius:20px}
    .step strong{display:inline-flex;width:34px;height:34px;border-radius:12px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--accent),#ffab7d);color:#fff;margin-bottom:10px}
    .step h3{margin:0 0 8px;font-size:1rem}
    .step p{margin:0;color:var(--muted);font-size:.94rem}
    .table-wrap{overflow:auto;border:1px solid var(--line);border-radius:20px;background:var(--panel);box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:820px}
    th,td{padding:15px 16px;border-bottom:1px solid #edf1fa;text-align:left;vertical-align:top}
    th{background:#f8fbff;color:#20315f;font-size:.95rem}
    tr:last-child td{border-bottom:none}
    .rating{font-weight:700;color:#0f4ac8}
    .review-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .review small{color:var(--accent2);font-weight:700}
    .case-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:14px}
    .gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
    .gallery img,.banner-stack img{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .article-list{display:grid;gap:10px}
    .article-list a{display:flex;justify-content:space-between;gap:16px;padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:16px;color:var(--text)}
    .article-list a span{color:var(--muted)}
    .faq{display:grid;gap:12px}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:0 16px;box-shadow:var(--shadow)}
    summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700}
    summary::-webkit-details-marker{display:none}
    details p{margin:0 0 16px;color:var(--muted)}
    .form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .form .full{grid-column:1/-1}
    input,select,textarea{width:100%;padding:14px 15px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);font:inherit;outline:none;transition:border-color .2s, box-shadow .2s}
    input:focus,select:focus,textarea:focus{border-color:#8ba9ff;box-shadow:0 0 0 4px rgba(53,109,255,.1)}
    textarea{min-height:120px;resize:vertical}
    .footer{margin-top:18px;padding:22px 0 30px;background:#f4f7ff;border-top:1px solid var(--line);color:var(--text)}
    .footer a{color:#234cc8}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer-note{color:var(--muted);font-size:.92rem}
    .floating{position:fixed;right:16px;bottom:16px;z-index:70;display:grid;gap:10px}
    .float-btn{width:50px;height:50px;border-radius:16px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),#6a8dff);color:#fff;box-shadow:var(--shadow)}
    .backtop{display:none}
    .reveal{opacity:0;transform:translateY(14px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 1080px){
      .hero-grid,.case-grid,.footer-grid{grid-template-columns:1fr}
      .grid-4,.grid-3,.review-grid,.workflow{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width: 760px){
      .nav-links,.nav-cta{display:none}
      .menu-btn,.mobile-only{display:inline-flex}
      .hero{padding-top:22px}
      .hero-card,.side-panel{padding:18px}
      .hero-points,.grid-4,.grid-3,.review-grid,.workflow,.form{grid-template-columns:1fr}
      .kefu{grid-template-columns:84px 1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      h1{font-size:2rem}
      .article-list a{flex-direction:column}
      .floating{right:12px;bottom:12px}
    }