:root{--bg:#fbfaf7;--fg:#1d2321;--muted:#5d6763;--accent:#2f6b4f;--line:#e2ded5}
@media (prefers-color-scheme:dark){:root{--bg:#141816;--fg:#ecefed;--muted:#a3ada8;--accent:#7fc3a0;--line:#2b322f}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:56px 20px 80px}
header{display:flex;justify-content:space-between;align-items:center;margin-bottom:56px;gap:16px;flex-wrap:wrap}
.brand{font-weight:700;letter-spacing:-.01em;color:var(--fg);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:18px}nav a:hover{color:var(--accent)}
h1{font-size:2.2rem;line-height:1.15;letter-spacing:-.02em;margin:0 0 16px}
h2{font-size:1.15rem;margin:36px 0 8px}
p,li{color:var(--fg)}.lead{font-size:1.15rem;color:var(--muted)}
a{color:var(--accent)}
.card{border:1px solid var(--line);border-radius:12px;padding:22px 24px;margin:32px 0}
.card h3{margin:0 0 6px}
footer{margin-top:72px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}