:root{
      --bg:#f7f8fc;
      --bg2:#fff8f2;
      --card:#ffffff;
      --text:#162033;
      --muted:#5d6a7e;
      --line:#e7ebf2;
      --primary:#5b5eff;
      --accent:#ff5e7a;
      --accent2:#ffb347;
      --good:#1f9d63;
      --shadow:0 16px 40px rgba(31, 44, 72, .08);
      --radius:22px;
      --radius2:16px;
      --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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(91,94,255,.12), transparent 28%),
        radial-gradient(circle at right 14%, rgba(255,94,122,.10), transparent 24%),
        linear-gradient(180deg, #ffffff 0%, var(--bg) 50%, #f8fbff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .topbar,.site-header,.site-footer,.section{position:relative}
    .topbar{
      background:rgba(255,255,255,.72);
      backdrop-filter:blur(12px);
      border-bottom:1px solid rgba(231,235,242,.8);
    }
    .topbar .container{
      display:flex;justify-content:space-between;align-items:center;gap:16px;
      padding:10px 0;color:var(--muted);font-size:14px;
    }
    .topbar .quick{
      display:flex;flex-wrap:wrap;gap:12px;align-items:center
    }
    .quick a{color:var(--primary);font-weight:600}
    header.site-header{
      position:sticky;top:0;z-index:30;
      background:rgba(255,255,255,.82);
      backdrop-filter:blur(14px);
      border-bottom:1px solid rgba(231,235,242,.9);
    }
    .header-inner{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      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 8px 22px rgba(0,0,0,.08)
    }
    .brand-title{display:flex;flex-direction:column;line-height:1.1}
    .brand-title strong{font-size:18px;letter-spacing:.5px}
    .brand-title span{font-size:12px;color:var(--muted)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text);font-weight:700}
    nav.main-nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    nav.main-nav a{
      font-size:14px;color:var(--text);padding:8px 10px;border-radius:10px;transition:.25s ease
    }
    nav.main-nav a:hover{background:rgba(91,94,255,.08);color:var(--primary)}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:none;border-radius:14px;padding:12px 18px;font-weight:700;cursor:pointer;
      transition:.25s ease;box-shadow:none
    }
    .btn-primary{
      background:linear-gradient(135deg,var(--primary),#7c4dff);
      color:#fff;box-shadow:0 14px 30px rgba(91,94,255,.24)
    }
    .btn-primary:hover{transform:translateY(-2px)}
    .btn-ghost{background:#fff;border:1px solid var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:#d3d9e6;transform:translateY(-2px)}
    .hero{
      padding:38px 0 26px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch
    }
    .hero-copy,.hero-side,.card,.feature,.step,.review,.case,.panel,.faq-item,.form-wrap,.compare,.timeline{
      background:rgba(255,255,255,.88);
      border:1px solid rgba(231,235,242,.9);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-copy{padding:32px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;
      background:rgba(255,94,122,.10);color:#bf2950;font-weight:700;font-size:13px
    }
    h1{margin:16px 0 12px;font-size:clamp(30px,5vw,54px);line-height:1.06;letter-spacing:-.02em}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:24px
    }
    .mini{
      padding:14px;border-radius:16px;background:linear-gradient(180deg,#fff,#f8faff);border:1px solid var(--line)
    }
    .mini strong{display:block;font-size:18px;margin-bottom:4px}
    .mini span{font-size:13px;color:var(--muted)}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:14px;justify-content:space-between}
    .side-stat{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px
    }
    .stat{
      padding:16px;border-radius:18px;background:linear-gradient(135deg,#fff7fb,#f4f6ff);border:1px solid #eef0fb
    }
    .stat b{display:block;font-size:28px;line-height:1;color:var(--text)}
    .stat small{color:var(--muted)}
    .side-box{
      padding:16px;border-radius:18px;background:linear-gradient(135deg,rgba(91,94,255,.08),rgba(255,94,122,.08));
      border:1px dashed rgba(91,94,255,.22)
    }
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:clamp(24px,3.2vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:70ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .card,.feature,.step,.review,.case,.panel,.faq-item,.form-wrap,.compare,.timeline{padding:20px}
    .feature h3,.card h3,.step h3,.case h3,.panel h3{margin:10px 0 8px;font-size:18px}
    .feature p,.card p,.step p,.case p,.panel p,.review p,.timeline p{margin:0;color:var(--muted);line-height:1.75}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(91,94,255,.14),rgba(255,94,122,.14));color:var(--primary);font-weight:900
    }
    .tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:var(--text)}
    .media-strip{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:stretch}
    .panel .image-wrap{border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#fff}
    .panel img{width:100%;height:auto}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .step-num{
      width:32px;height:32px;border-radius:10px;display:grid;place-items:center;
      background:var(--primary);color:#fff;font-weight:800;font-size:14px
    }
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:820px}
    th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f8faff;font-size:14px;color:#233049}
    td{color:var(--text);font-size:14px;line-height:1.7}
    .rating{
      display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px
    }
    .stars{color:#ffb400;font-size:20px;letter-spacing:2px}
    .faq-list{display:grid;gap:12px}
    .faq-item summary{
      list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;font-weight:700
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .answer{color:var(--muted);margin-top:12px;line-height:1.8}
    .review-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
    .review .role{color:var(--primary);font-weight:700;font-size:13px}
    .quote{font-size:14px;line-height:1.8;color:var(--muted)}
    .case-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .case .pill{display:inline-flex;padding:7px 10px;border-radius:999px;background:rgba(31,157,99,.10);color:var(--good);font-size:12px;font-weight:700}
    .article-list{display:grid;gap:12px}
    .article{
      display:flex;justify-content:space-between;gap:16px;align-items:center;
      padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:#fff
    }
    .article span{color:var(--muted);font-size:13px}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px}
    input,select,textarea{
      width:100%;border:1px solid #dfe5ef;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:rgba(91,94,255,.65);box-shadow:0 0 0 4px rgba(91,94,255,.08)}
    textarea{min-height:124px;resize:vertical}
    .full{grid-column:1/-1}
    .footer{
      margin-top:12px;padding:24px 0 30px;border-top:1px solid rgba(231,235,242,.95);background:rgba(255,255,255,.78)
    }
    .footer-inner{display:grid;grid-template-columns:1.1fr .9fr .8fr;gap:18px;align-items:start}
    .footer h3{margin:0 0 12px;font-size:18px}
    .footer p,.footer a,.footer li{color:var(--muted);line-height:1.8}
    .footer a:hover{color:var(--primary)}
    .footer .links{display:flex;flex-wrap:wrap;gap:10px}
    .footer .links a{padding:8px 10px;border:1px solid var(--line);border-radius:12px;background:#fff}
    .copyright{margin-top:18px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
    .float-tools{
      position:fixed;right:18px;bottom:18px;z-index:40;display:flex;flex-direction:column;gap:10px
    }
    .float-tools a,.float-tools button{
      width:48px;height:48px;border-radius:16px;border:none;display:grid;place-items:center;
      background:#fff;box-shadow:0 12px 24px rgba(31,44,72,.14);cursor:pointer;color:var(--text)
    }
    .float-tools a{border:1px solid var(--line)}
    .float-tools .hot{background:linear-gradient(135deg,var(--accent),#ff8b58);color:#fff}
    .wechat-pop{
      position:fixed;right:18px;bottom:76px;z-index:39;width:min(280px, calc(100vw - 36px));
      background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:16px;display:none
    }
    .wechat-pop.show{display:block}
    .wechat-pop img{border-radius:16px;border:1px solid var(--line);margin-bottom:10px}
    .mobile-only{display:none}
    .scroll-reveal{opacity:0;transform:translateY(16px);transition:.6s ease}
    .scroll-reveal.in{opacity:1;transform:none}
    .sticky-note{
      padding:12px 14px;border-radius:16px;background:#fff7f7;border:1px solid #ffd9df;color:#a73a52;font-size:13px;line-height:1.7
    }
    .about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:stretch}
    .timeline{display:grid;gap:14px}
    .time-item{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start}
    .time-dot{width:12px;height:12px;border-radius:50%;margin-top:6px;background:linear-gradient(135deg,var(--primary),var(--accent))}
    .compare .badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(31,157,99,.12);color:var(--good);font-weight:700;font-size:12px}
    .service-network{
      display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px
    }
    .network-item{
      padding:14px;border-radius:16px;background:#fff;border:1px solid var(--line);text-align:center;font-weight:700
    }
    @media (max-width: 980px){
      .hero-grid,.about-grid,.media-strip,.footer-inner,.grid-4,.grid-3,.steps,.case-grid,.service-network{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 760px){
      .topbar .container{flex-direction:column;align-items:flex-start}
      .nav-toggle{display:inline-flex}
      nav.main-nav{
        display:none;position:absolute;left:16px;right:16px;top:100%;
        background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)
      }
      nav.main-nav.show{display:flex;flex-direction:column;align-items:stretch}
      nav.main-nav a{padding:12px 10px}
      .header-inner{position:relative}
      .hero-grid,.about-grid,.media-strip,.footer-inner,.grid-4,.grid-3,.steps,.case-grid,.service-network,.form-grid{grid-template-columns:1fr}
      .hero-copy{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .side-stat{grid-template-columns:1fr 1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .mobile-only{display:block}
      .desktop-only{display:none}
      table{min-width:760px}
    }