:root { --bg:#ffffff; --fg:#1f2328; --muted:#59636e; --line:#d1d9e0; --link:#0969da; }
@media (prefers-color-scheme: dark) { :root { --bg:#0d1117; --fg:#e6edf3; --muted:#9198a1; --line:#3d444d; --link:#4493f8; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:16px/1.75 system-ui,-apple-system,"Segoe UI","Hiragino Sans","Noto Sans JP",sans-serif; }
main { max-width:720px; margin:0 auto; padding:40px 16px 64px; }
h1 { font-size:1.6rem; margin:0 0 .25rem; }
h2 { font-size:1.15rem; margin:2rem 0 .5rem; padding-bottom:.25rem; border-bottom:1px solid var(--line); }
p, li { margin:.4rem 0; }
.lead { color:var(--muted); margin-bottom:1.5rem; }
a { color:var(--link); }
code { font-size:.9em; }
footer { margin-top:3rem; padding-top:1rem; border-top:1px solid var(--line); color:var(--muted); font-size:.9rem; }