:root{--bg:#f6f8fc;--panel:#ffffff;--panel2:#fff7ef;--line:#e5e9f2;--text:#1e293b;--muted:#5b6475;--brand:#ff5b4d;--brand2:#ffb12b;--brand3:#276ef1;--shadow:0 14px 40px rgba(31,41,55,.08);--shadow2:0 10px 24px rgba(255,91,77,.14);--radius:22px;--radius2:16px;--max: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,#fff 0%,#f8fafd 18%,#f5f7fc 100%);color:var(--text);line-height:1.7}
    a{color:inherit;text-decoration:none} img{display:block;max-width:100%}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.84);backdrop-filter:blur(12px);border-bottom:1px solid rgba(229,233,242,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 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(15,23,42,.08)}
    .brand .name{font-size:18px;font-weight:800;letter-spacing:.3px}
    .brand .sub{font-size:12px;color:var(--muted)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .nav-links{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
    .nav-links a,.chip{padding:9px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--text);font-size:13px;transition:.25s ease}
    .nav-links a:hover,.chip:hover,.btn:hover,.btn2:hover{transform:translateY(-1px);box-shadow:var(--shadow2)}
    .menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px}
    .hero{position:relative;overflow:hidden;padding:28px 0 20px}
    .hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none}
    .hero::before{width:260px;height:260px;background:radial-gradient(circle,rgba(255,91,77,.25),transparent 68%);right:-70px;top:20px}
    .hero::after{width:220px;height:220px;background:radial-gradient(circle,rgba(39,110,241,.16),transparent 68%);left:-70px;bottom:0}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-card{background:linear-gradient(135deg,#fff 0%,#fff8f5 52%,#f6fbff 100%);border:1px solid rgba(229,233,242,.9);border-radius:28px;box-shadow:var(--shadow);padding:30px;position:relative;isolation:isolate}
    .hero-card .eyebrow{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,rgba(255,91,77,.12),rgba(255,177,43,.18));color:#a63a22;padding:8px 12px;border-radius:999px;font-weight:700;font-size:13px}
    h1{font-size:clamp(32px,5vw,52px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.02em}
    .lead{color:var(--muted);font-size:16px;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn,.btn2{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:14px;padding:13px 18px;font-weight:700;border:1px solid transparent;transition:.25s ease}
    .btn{background:linear-gradient(135deg,var(--brand),#ff7d4f);color:#fff;box-shadow:0 14px 26px rgba(255,91,77,.22)}
    .btn2{background:#fff;border-color:var(--line);color:var(--text)}
    .hero-side{display:grid;gap:14px}
    .stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .stat,.panel,.card,.quote,.faq-item,.article,.timeline-item,.compare,.form-card,.info-box{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .stat{padding:18px;position:relative;overflow:hidden}
    .stat strong{display:block;font-size:24px;margin-bottom:6px}
    .stat span{color:var(--muted);font-size:13px}
    .stat:nth-child(1){background:linear-gradient(135deg,#fff, #fff7f5)}
    .stat:nth-child(2){background:linear-gradient(135deg,#fff, #f8fbff)}
    .hero-note{padding:18px;background:linear-gradient(135deg,#101828,#1d2b54);color:#fff;border-radius:22px}
    .hero-note p{margin:6px 0 0;color:rgba(255,255,255,.82)}
    .section{padding:22px 0}
    .section h2{font-size:clamp(24px,3vw,36px);margin:0 0 10px}
    .section p.section-lead{margin:0 0 18px;color:var(--muted);max-width:72ch}
    .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:20px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li,.panel p,.article p,.faq-item p,.quote p{color:var(--muted)}
    .badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:#8c3b24;background:#fff1ea;border-radius:999px;padding:6px 10px;margin-bottom:12px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud .chip{background:linear-gradient(180deg,#fff,#fff9f4)}
    .panel{padding:22px}
    .panel .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .list{margin:12px 0 0;padding:0;list-style:none;display:grid;gap:10px}
    .list li{display:flex;gap:10px;align-items:flex-start}
    .dot{width:9px;height:9px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));margin-top:8px;flex:none}
    .media-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow);width:100%;object-fit:cover}
    table{width:100%;border-collapse:collapse;background:#fff;border-radius:18px;overflow:hidden}
    th,td{padding:14px 12px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left;font-size:14px}
    th{background:#fff7f3}
    .scroll-x{overflow-x:auto;border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .rating{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .stars{color:#ff9d1f;font-size:18px;letter-spacing:2px}
    details{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px 18px;box-shadow:var(--shadow)}
    details+details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;list-style:none}
    summary::-webkit-details-marker{display:none}
    .quotes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .quote{padding:18px}
    .quote .role{font-weight:800;margin-top:12px}
    .quote .name{color:var(--brand);font-weight:700;font-size:13px}
    .timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .timeline-item{padding:18px;position:relative}
    .timeline-item .step{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800;margin-bottom:12px}
    .articles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article{padding:18px}
    .article .meta{font-size:12px;color:#6b7280;margin-top:8px}
    .form-card form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    label{font-weight:700;font-size:14px}
    input,select,textarea{width:100%;border:1px solid #dbe3f0;border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:.2s ease}
    input:focus,select:focus,textarea:focus{border-color:#ff8b62;box-shadow:0 0 0 4px rgba(255,91,77,.08)}
    textarea{min-height:120px;resize:vertical}
    .footer{padding:24px 0 36px;margin-top:8px;border-top:1px solid var(--line);background:linear-gradient(180deg,#fff,#f7f9fd)}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    .footer a{color:#1f4fd0}
    .mini{font-size:13px;color:var(--muted)}
    .float-box{position:fixed;right:14px;bottom:16px;z-index:40;display:grid;gap:10px}
    .float-box a,.to-top{display:inline-flex;align-items:center;justify-content:center;min-width:52px;height:52px;border-radius:16px;background:linear-gradient(135deg,var(--brand),#ff8c45);color:#fff;font-weight:800;box-shadow:0 14px 24px rgba(255,91,77,.26)}
    .to-top{background:#101828}
    .mobile-only{display:none}
    .section-fade{opacity:0;transform:translateY(14px);transition:.55s ease}
    .section-fade.in{opacity:1;transform:none}
    .flex-between{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}
    .inline-links{display:flex;flex-wrap:wrap;gap:10px}
    .inline-links a{padding:8px 10px;border-radius:999px;border:1px solid var(--line);background:#fff}
    .kefu{display:grid;grid-template-columns:132px 1fr;gap:16px;align-items:center}
    .kefu img{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow);background:#fff}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.quotes,.articles,.timeline,.footer-grid,.grid-2,.panel .split,.media-row{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:66px;background:#fff;padding:12px;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);z-index:20}
      .nav{position:relative}
      .stats{grid-template-columns:1fr 1fr}
      .desktop-only{display:none}
      .mobile-only{display:block}
      .kefu{grid-template-columns:1fr}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max),calc(100% - 24px))}
      .hero-card,.panel,.card,.quote,.article,.form-card,details,.timeline-item,.stat,.info-box{border-radius:18px}
      .hero-card{padding:22px}
      .stats{grid-template-columns:1fr}
      .nav-actions .btn2{display:none}
      .lead{font-size:15px}
      table{min-width:860px}
    }