:root{
  --brick:#D94A3D; --orange:#F09929; --blue:#3370B8; --green:#33B582;
  --cream:#FFF7EA; --ink:#1D2B36; --muted:#5c6b78; --bg:#fff; --card:#fff;
  --line:rgba(29,43,54,.10); --shadow:0 3px 10px rgba(0,0,0,.05);
  --sans:"Avenir Next",Avenir,-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--ink:#F2EDE4;--muted:#a4b1bc;--bg:#12191F;--card:#1A232B;--line:rgba(255,255,255,.11);--cream:#1A232B;--shadow:0 3px 10px rgba(0,0,0,.35)}
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--brick)}
.wrap{max-width:760px;margin:0 auto;padding:0 24px}
header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 24px;max-width:1080px;margin:0 auto}
.nav img{height:34px;width:auto}
.btn{display:inline-block;background:var(--brick);color:#fff;text-decoration:none;font-weight:700;padding:10px 18px;border-radius:999px;font-size:.94rem}
.btn.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.doc{padding:52px 24px 72px}
h1{font-size:clamp(2rem,4.6vw,2.9rem);font-weight:800;letter-spacing:-.02em;margin:0 0 8px}
h2{font-size:1.4rem;font-weight:800;letter-spacing:-.015em;margin:38px 0 10px}
h3{font-size:1.06rem;font-weight:700;margin:26px 0 6px}
p,li{margin:0 0 12px}
ul{padding-left:22px}
.muted{color:var(--muted);font-size:.92rem}
.lead{font-size:1.1rem;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:.9rem}
footer a{color:var(--muted)}