:root{--bg:#f7f7f5;--fg:#1d1d1b;--muted:#5f5f5a;--card:#fff;--line:#e3e3de;--accent:#0b6e4f}
@media (prefers-color-scheme:dark){:root{--bg:#141414;--fg:#ececea;--muted:#a3a39e;--card:#1e1e1e;--line:#2e2e2c;--accent:#4cc79a}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:16px}
header{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
header nav{display:flex;gap:16px}
a{color:var(--accent)}
.brand{font-weight:700;font-size:1.15rem;text-decoration:none;color:var(--fg)}
main{background:var(--card);border:1px solid var(--line);border-radius:12px}
h1{font-size:1.7rem;line-height:1.25;margin:.4em 0}
h2{font-size:1.15rem;margin:1.6em 0 .4em}
.muted,footer{color:var(--muted);font-size:.9rem}
.lead{font-size:1.1rem}
.note{border-left:3px solid var(--accent);padding-left:12px;color:var(--muted)}