:root{
  --ink:#12161c;
  --ink-2:#4a5563;
  --ink-3:#7b8794;
  --line:#e6eaf0;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --brand:#1f6feb;
  --brand-dark:#1758c0;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}

/* header */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line);
}
.site-header .wrap{display:flex;align-items:center;height:66px;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:.2px}
.brand-mark{
  width:30px;height:30px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,#1f6feb,#38bdf8);color:#fff;font-size:14px;font-weight:800;
}
.nav{display:flex;gap:26px;margin-left:auto;font-size:15px;color:var(--ink-2)}
.nav a:hover{color:var(--brand)}
.nav-cta{
  margin-left:8px;padding:9px 18px;border-radius:10px;background:var(--brand);color:#fff;
  font-size:14px;font-weight:600;white-space:nowrap;transition:.18s;
}
.nav-cta:hover{background:var(--brand-dark)}

/* hero */
.hero{padding:86px 0 74px;background:
  radial-gradient(900px 420px at 12% -10%,#eaf2ff 0%,rgba(255,255,255,0) 62%),
  radial-gradient(700px 380px at 92% 0%,#eafaf4 0%,rgba(255,255,255,0) 60%);
  border-bottom:1px solid var(--line);
}
.hero h1{font-size:44px;line-height:1.25;letter-spacing:-.5px;font-weight:800}
.hero h1 span{color:var(--brand)}
.hero p.lead{margin-top:20px;font-size:17px;color:var(--ink-2);max-width:620px}
.hero-actions{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:11px;font-size:15px;font-weight:600;transition:.18s;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(31,111,235,.22)}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:#cfd8e3}

/* sections */
section.block{padding:70px 0}
.section-head{max-width:640px;margin-bottom:38px}
.section-head h2{font-size:28px;font-weight:750;letter-spacing:-.2px}
.section-head p{margin-top:12px;color:var(--ink-2)}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{
  border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;background:#fff;
  transition:.2s;
}
.card:hover{border-color:#d7e2ef;box-shadow:0 12px 28px rgba(18,22,28,.06);transform:translateY(-2px)}
.card .ico{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:var(--bg-soft);color:var(--brand);margin-bottom:16px;font-size:19px;
}
.card h3{font-size:17px;font-weight:700;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--ink-2)}

.stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:34px;
  border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;background:var(--bg-soft);
}
.stat b{display:block;font-size:26px;font-weight:800;color:var(--ink)}
.stat span{font-size:13.5px;color:var(--ink-3)}

.about-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:start}
.about-grid p{color:var(--ink-2);font-size:15.5px}
.about-grid p + p{margin-top:14px}
.about-side{
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;background:#fff;
}
.about-side dt{font-size:13px;color:var(--ink-3);margin-top:14px}
.about-side dt:first-child{margin-top:0}
.about-side dd{font-size:15px;font-weight:600}

.contact{
  border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;background:var(--bg-soft);
  display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;
}
.contact h2{font-size:22px;font-weight:750}
.contact p{margin-top:10px;color:var(--ink-2);font-size:15px}
.contact-list{margin-top:16px;display:flex;flex-direction:column;gap:6px;font-size:14.5px;color:var(--ink-2)}
.contact-list b{color:var(--ink);font-weight:600}

footer.site-footer{border-top:1px solid var(--line);padding:26px 0 34px;color:var(--ink-3);font-size:13.5px}
footer.site-footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer.site-footer a:hover{color:var(--brand)}

/* floating chat */
.chat-fab{
  position:fixed;right:22px;bottom:26px;z-index:60;display:inline-flex;align-items:center;gap:9px;
  padding:13px 20px;border-radius:999px;background:var(--brand);color:#fff;font-size:15px;font-weight:600;
  box-shadow:0 12px 30px rgba(31,111,235,.32);transition:.18s;
}
.chat-fab:hover{background:var(--brand-dark);transform:translateY(-2px)}
.chat-fab .dot{width:8px;height:8px;border-radius:50%;background:#7df0b0;box-shadow:0 0 0 3px rgba(125,240,176,.28)}

@media (max-width:900px){
  .nav{display:none}
  .hero{padding:56px 0 50px}
  .hero h1{font-size:31px}
  .hero p.lead{font-size:15.5px}
  .cards{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr;gap:16px}
  .about-grid{grid-template-columns:1fr;gap:24px}
  .contact{grid-template-columns:1fr}
  section.block{padding:52px 0}
  .section-head h2{font-size:23px}
  .chat-fab{right:14px;bottom:16px;padding:12px 18px;font-size:14px}
}