:root{
  --brand:#2071ff;
  --brand-dark:#0f47b8;
  --ink:#0b1220;
  --muted:#5b6780;
  --bg:#ffffff;
  --soft:#f4f7fe;
  --line:#e6ecf7;
  --radius:16px;
  --max:1200px;
}
*{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",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:28px;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px;letter-spacing:-.02em}
.brand .dot{width:12px;height:12px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 5px rgba(32,113,255,.16)}
.nav-links{display:flex;gap:24px;flex:1;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-weight:600;font-size:15px}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--brand)}
.lang{display:flex;gap:6px;font-size:13px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:4px 10px}
.lang a[aria-current="true"]{color:var(--brand);font-weight:700}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:11px 22px;font-weight:700;font-size:15px;transition:.2s;white-space:nowrap}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px rgba(32,113,255,.28)}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{border:1px solid var(--line);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}

/* hero */
.hero{position:relative;padding:88px 0 72px;background:linear-gradient(180deg,#eef4ff 0%,#ffffff 100%);overflow:hidden}
.hero h1{font-size:clamp(32px,5vw,56px);line-height:1.15;margin:0 0 16px;letter-spacing:-.03em}
.hero p.lead{font-size:18px;color:var(--muted);max-width:620px;margin:0 0 28px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero img{border-radius:24px;box-shadow:0 30px 60px rgba(11,18,32,.14)}
.stats{display:flex;gap:36px;margin-top:40px;flex-wrap:wrap}
.stats div strong{display:block;font-size:26px}
.stats div span{color:var(--muted);font-size:14px}

/* sections */
section{padding:72px 0}
.section-soft{background:var(--soft)}
h2{font-size:clamp(26px,3.4vw,38px);margin:0 0 12px;letter-spacing:-.02em}
.sub{color:var(--muted);max-width:680px;margin:0 0 36px}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(11,18,32,.08);border-color:#cfe0ff}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.badge{display:inline-block;background:rgba(32,113,255,.1);color:var(--brand);font-weight:700;font-size:13px;padding:5px 12px;border-radius:999px;margin-bottom:14px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split img{border-radius:20px;box-shadow:0 24px 50px rgba(11,18,32,.12)}
ul.check{list-style:none;padding:0;margin:0 0 24px}
ul.check li{position:relative;padding-left:26px;margin-bottom:10px;color:var(--muted)}
ul.check li::before{content:"";position:absolute;left:0;top:10px;width:10px;height:10px;border-radius:50%;background:var(--brand)}
.cta{background:linear-gradient(120deg,#123a94,#2071ff);color:#fff;border-radius:24px;padding:56px 40px;text-align:center}
.cta h2{color:#fff}
.cta p{color:rgba(255,255,255,.85);max-width:620px;margin:0 auto 26px}
.cta .btn-primary{background:#fff;color:var(--brand);box-shadow:none}
.price{display:flex;align-items:baseline;gap:6px;font-size:34px;font-weight:800;margin:8px 0 16px}
.price span{font-size:14px;color:var(--muted);font-weight:600}
details{border:1px solid var(--line);border-radius:14px;padding:18px 20px;background:#fff;margin-bottom:12px}
details summary{cursor:pointer;font-weight:700;list-style:none}
details summary::-webkit-details-marker{display:none}
details p{color:var(--muted);margin:12px 0 0}
.prose p,.prose li{color:var(--muted)}
.prose h2{margin-top:36px}

/* footer */
.site-footer{background:#0b1220;color:#aab6cc;padding:60px 0 28px;margin-top:20px}
.site-footer .brand{color:#fff;margin-bottom:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
.site-footer h4{color:#fff;font-size:15px;margin:0 0 14px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:10px;font-size:14px}
.site-footer a:hover{color:#fff}
.copyright{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:20px;font-size:13px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

@media (max-width:900px){
  .hero-grid,.split,.g4,.g3,.g2,.foot-grid{grid-template-columns:1fr}
  .nav{height:auto;padding:14px 0;flex-wrap:wrap;gap:14px}
  .nav-links{order:3;width:100%;gap:16px}
  section{padding:52px 0}
}