:root{
  --bg:#ffffff; --fg:#1b1f24; --muted:#5b6672; --line:#e4e8ec;
  --accent:#1f6feb; --card:#f7f9fb; --radius:10px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--fg);font-family:var(--font);line-height:1.65;-webkit-font-smoothing:antialiased}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.nav{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{font-weight:700;font-size:1.15rem;color:var(--fg);letter-spacing:-.01em}
.nav nav a{margin-left:22px;color:var(--muted);font-size:.94rem}
.hero{padding:72px 0 56px;border-bottom:1px solid var(--line)}
.hero h1{font-size:2.3rem;line-height:1.2;margin:0 0 14px;letter-spacing:-.02em;max-width:22ch}
.lead{font-size:1.1rem;color:var(--muted);max-width:60ch;margin:0 0 26px}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:11px 20px;border-radius:var(--radius);font-weight:600;font-size:.95rem}
.btn:hover{text-decoration:none;filter:brightness(.94)}
.section{padding:52px 0}
h2{font-size:1.5rem;margin:0 0 22px;letter-spacing:-.01em}
h3{font-size:1.05rem;margin:0 0 8px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.steps{margin:0;padding-left:22px}
.steps li{margin-bottom:10px;color:var(--muted)}
.steps strong{color:var(--fg)}
.muted{color:var(--muted)}
footer{border-top:1px solid var(--line);padding:26px 0;font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
@media (max-width:640px){
  .hero{padding:48px 0 36px}
  .hero h1{font-size:1.75rem}
  .nav nav a{margin-left:14px;font-size:.88rem}
}
@media (prefers-color-scheme:dark){
  :root{--bg:#14171a;--fg:#e8eaed;--muted:#9aa4af;--line:#272c31;--card:#1b1f23}
  .nav{background:var(--bg)}
  .brand{color:var(--fg)}
}