:root{--ink:#1f2a2e;--muted:#5d6b70;--line:#d9dfe1;--bg:#f7f8f6;--card:#fff;--accent:#2f6f5e;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
@media (prefers-color-scheme:dark){:root{--ink:#e6ecee;--muted:#a3b0b4;--line:#33403f;--bg:#141a19;--card:#1c2423;--accent:#7cc4ad}}
*{box-sizing:border-box}
body{margin:0;line-height:1.55;background:var(--bg)}
header,footer{padding:.8rem 1rem;border-bottom:1px solid var(--line);background:var(--card)}
footer{border-top:1px solid var(--line);border-bottom:0;margin-top:2rem;font-size:.85rem;color:var(--muted)}
header a.brand{font-weight:700;color:var(--ink);text-decoration:none}
nav{display:flex;gap:1rem;flex-wrap:wrap;margin-top:.3rem;font-size:.9rem}
main{max-width:42rem;margin:0 auto;padding:1rem}
h1{font-size:1.5rem;margin:.6rem 0}
h2{font-size:1.1rem;margin:1.6rem 0 .4rem}
a{color:var(--accent)}
.muted{color:var(--muted);font-size:.9rem}
.box{background:var(--card);border:1px solid var(--line);border-radius:.6rem;padding:.8rem 1rem;margin:1rem 0}