:root { color-scheme: light dark; --fg: #1f2328; --muted: #59636e; --bg: #ffffff; }
@media (prefers-color-scheme: dark) { :root { --fg: #e6edf3; --muted: #9198a1; --bg: #0d1117; } }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.7 system-ui, "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 42rem; margin: 0 auto; padding: 2rem 1rem 4rem; }
h1 { font-size: 1.5rem; } h2 { font-size: 1.15rem; margin-top: 2rem; }
p.muted, footer { color: var(--muted); font-size: .9rem; }
a { color: inherit; }