:root { --fg: #1d1d1f; --muted: #555; --bg: #fdfbf7; --line: #e4ded3; --link: #0b4f9c; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --fg: #f2f2f2; --muted: #b8b8b8; --bg: #141414; --line: #333; --link: #7fb8ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.75 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 1.6rem; line-height: 1.4; margin: 0 0 4px; }
h2 { font-size: 1.25rem; margin: 2.2em 0 .4em; padding-top: 1em; border-top: 1px solid var(--line); }
h3 { font-size: 1.05rem; margin: 1.6em 0 .3em; }
a { color: var(--link); }
.meta, .muted { color: var(--muted); font-size: .92rem; }
nav { margin: 0 0 24px; font-size: .95rem; }
nav a { margin-right: 1em; }
ul { padding-left: 1.3em; }
footer { margin-top: 48px; color: var(--muted); font-size: .9rem; }