:root{
  --brand:#3b4ce2; --brand-dark:#2a38b0; --ink:#0f172a; --muted:#64748b;
  --bg:#ffffff; --soft:#f1f5f9; --line:#e2e8f0; --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:12px 22px;border-radius:999px;font-weight:600;transition:background .15s}
.btn:hover{background:var(--brand-dark)}
.btn-ghost{background:transparent;color:var(--brand);border:1px solid var(--brand)}
.btn-ghost:hover{background:var(--soft)}

header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.site .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--brand)}
.brand span{color:var(--ink)}
nav.main a{margin-left:22px;color:var(--muted);font-weight:500}
nav.main a:hover,nav.main a.active{color:var(--ink)}

.hero{background:linear-gradient(180deg,var(--soft),#fff);padding:72px 0 56px}
.hero h1{font-size:clamp(32px,5vw,52px);line-height:1.08;letter-spacing:-.03em;margin:0 0 16px;max-width:14ch}
.hero p{font-size:18px;color:var(--muted);max-width:52ch;margin:0 0 28px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}

.section{padding:56px 0}
.section h2{font-size:28px;letter-spacing:-.02em;margin:0 0 8px}
.section .lead{color:var(--muted);margin:0 0 32px;max-width:60ch}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:760px){.grid{grid-template-columns:1fr}nav.main a{margin-left:14px;font-size:14px}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.card h3{margin:0 0 6px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.icon{width:40px;height:40px;border-radius:10px;background:var(--soft);display:flex;align-items:center;justify-content:center;margin-bottom:14px;font-size:20px}

.band{background:var(--ink);color:#fff;border-radius:20px;padding:40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.band h2{margin:0;color:#fff}
.band p{margin:6px 0 0;color:#cbd5e1}

.note{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin-top:28px}
.note h3{margin:0 0 8px;font-size:16px}
.note p{margin:0 0 10px;color:var(--muted);font-size:14px}
pre{background:#0b1020;color:#e2e8f0;border-radius:10px;padding:14px 16px;overflow:auto;font-size:13px;line-height:1.5}
code{font-family:ui-monospace,Menlo,Consolas,monospace}

footer.site{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:14px;margin-top:40px}
footer.site .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}