:root{
      --bg:#f4f7fb;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#10213a;
      --muted:#5d6b84;
      --line:#d8e2f0;
      --blue:#1557ff;
      --blue2:#0d3ea8;
      --cyan:#15b8ff;
      --gold:#f7b500;
      --shadow:0 14px 40px rgba(17, 48, 92, .10);
      --radius:22px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(21,87,255,.12), transparent 28%),
        radial-gradient(circle at 85% 15%, rgba(21,184,255,.12), transparent 22%),
        linear-gradient(180deg, #f7faff 0%, #f4f7fb 28%, #eef4ff 100%);
    }
    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:40;
      backdrop-filter:saturate(160%) blur(16px);
      background:rgba(247,250,255,.82);
      border-bottom:1px solid rgba(216,226,240,.8);
    }
    .topbar{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;padding:4px;box-shadow:0 8px 18px rgba(21,87,255,.10)}
    .brand h2{margin:0;font-size:16px;line-height:1.1}
    .brand p{margin:3px 0 0;color:var(--muted);font-size:12px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:14px;padding:10px 12px}
    nav{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    nav a{font-size:14px;color:#284160;padding:8px 10px;border-radius:999px;transition:.2s}
    nav a:hover{background:#eaf2ff;color:var(--blue2)}
    .home-link{background:linear-gradient(135deg,var(--blue),var(--cyan)); color:#fff !important; padding:10px 14px; box-shadow:0 10px 20px rgba(21,87,255,.18)}
    .hero{
      padding:38px 0 24px;
    }
    .hero-grid{
      display:grid;
      grid-template-columns:1.3fr .9fr;
      gap:22px;
      align-items:stretch;
    }
    .hero-main,.hero-side,.section-card,.faq-item,.review-card,.article-card,.case-card,.service-card,.metric,.flow-item,.compare-box,.form-wrap,.quote-card{
      background:rgba(255,255,255,.88);
      border:1px solid rgba(216,226,240,.9);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-main{padding:28px; position:relative; overflow:hidden}
    .hero-main:before{
      content:"";position:absolute;inset:auto -90px -110px auto;width:260px;height:260px;border-radius:50%;
      background:radial-gradient(circle, rgba(21,87,255,.15), transparent 65%);
      pointer-events:none;
    }
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef5ff;color:var(--blue2);font-weight:700;font-size:13px}
    h1{margin:16px 0 12px;font-size:clamp(30px,4vw,50px);line-height:1.08;letter-spacing:-.02em}
    .hero-main p{margin:0;color:var(--muted);line-height:1.85;font-size:16px;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:1px solid transparent;border-radius:14px;padding:12px 16px;font-weight:700;
      transition:.2s ease;cursor:pointer;white-space:nowrap
    }
    .btn-primary{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;box-shadow:0 10px 22px rgba(21,87,255,.18)}
    .btn-secondary{background:#fff;color:var(--blue2);border-color:var(--line)}
    .btn:hover{transform:translateY(-1px);box-shadow:0 12px 24px rgba(15,42,84,.12)}
    .hero-stats{
      display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px
    }
    .mini-stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#eef4ff);border:1px solid #dbe6fb}
    .mini-stat strong{display:block;font-size:22px;margin-bottom:4px}
    .mini-stat span{color:var(--muted);font-size:13px;line-height:1.5}
    .hero-side{padding:18px}
    .hero-side .panel{
      background:linear-gradient(180deg,#0f3fa8,#165df9);
      color:#fff;border-radius:18px;padding:18px;
      min-height:100%;
      display:flex;flex-direction:column;justify-content:space-between;gap:16px
    }
    .panel h3{margin:0;font-size:20px}
    .panel ul{margin:0;padding-left:18px;display:grid;gap:10px;line-height:1.6}
    .panel .tip{padding:12px 14px;border-radius:14px;background:rgba(255,255,255,.12)}
    .strip{margin:22px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .metric{padding:16px}
    .metric b{font-size:22px;display:block}
    .metric small{display:block;margin-top:6px;color:var(--muted);line-height:1.6}
    section{padding:14px 0 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin:18px 0 14px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:70ch;line-height:1.7}
    .section-card{padding:22px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-card,.case-card,.review-card,.article-card,.faq-item,.flow-item,.quote-card{padding:18px}
    .service-card h3,.case-card h3,.review-card h3,.article-card h3,.flow-item h3{margin:0 0 10px;font-size:18px}
    .service-card p,.case-card p,.review-card p,.article-card p,.flow-item p,.quote-card p{margin:0;color:var(--muted);line-height:1.75}
    .pill-row,.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .pill,.tag{display:inline-flex;align-items:center;padding:8px 11px;border-radius:999px;background:#eef4ff;color:#21406b;font-size:13px;border:1px solid #dbe6fb}
    .timeline{display:grid;gap:14px}
    .time-item{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:start;padding:14px 0;border-top:1px solid var(--line)}
    .time-item:first-child{border-top:none;padding-top:0}
    .time-item b{color:var(--blue2)}
    .compare-box table{width:100%;border-collapse:collapse}
    .compare-box th,.compare-box td{padding:14px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    .compare-box th{background:#f4f8ff;color:#24446d}
    .compare-note{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
    .rating{font-size:22px;font-weight:800;color:var(--blue2)}
    .faq-list{display:grid;gap:12px}
    .faq-item summary{cursor:pointer;list-style:none;font-weight:700;color:var(--text)}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item div{padding-top:10px;color:var(--muted);line-height:1.8}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .stars{color:#f39c12;font-size:14px;letter-spacing:2px;margin-bottom:10px}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article-card .meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:13px;margin-top:14px}
    .case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .case-card .badge{display:inline-flex;margin-bottom:10px;padding:7px 10px;border-radius:999px;background:#eaf3ff;color:var(--blue2);font-size:12px;font-weight:700}
    .form-wrap{padding:22px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .full{grid-column:1/-1}
    label{display:block;font-size:13px;color:#29415e;margin-bottom:8px;font-weight:700}
    input,select,textarea{
      width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:14px;
      background:#fff;color:var(--text);outline:none;transition:.2s
    }
    input:focus,select:focus,textarea:focus{border-color:#7aa6ff;box-shadow:0 0 0 4px rgba(21,87,255,.08)}
    textarea{min-height:120px;resize:vertical}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    footer{
      margin-top:18px;padding:22px 0 28px;border-top:1px solid rgba(216,226,240,.9);
      background:linear-gradient(180deg,#eff5ff,#eaf1fb);
      color:#1a2f4d;
    }
    .footer-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:start}
    .contact-card{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:center;padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .contact-card img{width:120px;height:120px;object-fit:cover;border-radius:16px;border:1px solid var(--line);background:#fff}
    .small{font-size:13px;color:var(--muted);line-height:1.75}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:50;display:grid;gap:10px
    }
    .float-btn{
      width:48px;height:48px;border:none;border-radius:16px;background:linear-gradient(135deg,var(--blue),var(--cyan));
      color:#fff;box-shadow:0 12px 24px rgba(21,87,255,.25);display:grid;place-items:center;cursor:pointer
    }
    .float-link{
      background:#fff;color:var(--blue2);border:1px solid var(--line);border-radius:16px;padding:11px 14px;font-weight:700;box-shadow:var(--shadow)
    }
    .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease, transform .6s ease}
    .reveal.show{opacity:1;transform:translateY(0)}
    .service-network{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
    .network-item{padding:14px;border-radius:16px;background:#f7fbff;border:1px solid #dce8fb;text-align:center;font-size:13px;color:#2c476c}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .note-list{margin:0;padding-left:18px;color:var(--muted);line-height:1.8}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.grid-4,.grid-3,.reviews,.article-list,.case-grid,.footer-grid,.split,.service-network{grid-template-columns:1fr 1fr}
      .strip{grid-template-columns:1fr 1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      form{grid-template-columns:1fr}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      nav{display:none;width:100%;padding:12px 0 2px;justify-content:flex-start}
      nav.open{display:flex}
      .topbar{flex-wrap:wrap}
      .hero-grid,.grid-4,.grid-3,.reviews,.article-list,.case-grid,.footer-grid,.split,.service-network,.strip{grid-template-columns:1fr}
      .hero{padding-top:24px}
      .hero-main{padding:22px}
      .hero-stats{grid-template-columns:1fr 1fr}
      .time-item{grid-template-columns:1fr}
      .contact-card{grid-template-columns:1fr}
      .mobile-only{display:block}
      .compare-box{overflow-x:auto}
      .compare-box table{min-width:780px}
    }