:root { --ink:#1c1d21; --muted:#5f6370; --paper:#fff; --line:#e4e5e9; --accent:#3d5afe; }
@media (prefers-color-scheme: dark) { :root { --ink:#e8e9ec; --muted:#9a9ea8; --paper:#16171b; --line:#2b2d33; --accent:#7c8cff; } }
body { margin:0; background:var(--paper); color:var(--ink); font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif; }
main { max-width:680px; margin:0 auto; padding:48px 16px; }
h1 { font-size:2rem; margin:0 0 .25rem; } h2 { font-size:1.15rem; margin-top:2rem; }
p.lead, .muted { color:var(--muted); } a { color:var(--accent); }
footer { margin-top:3rem; padding-top:1rem; border-top:1px solid var(--line); font-size:.9rem; color:var(--muted); }