:root { --bg: #fff; --fg: #222; --muted: #666; --link: #0b57d0; --code: #f2f2f2; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #151515; --fg: #e6e6e6; --muted: #9a9a9a; --link: #8ab4f8; --code: #262626; }
}
body { margin: 0; background: var(--bg); color: var(--fg); font-family: -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; line-height: 1.8; }
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 1.6rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 32px 0 8px; }
a { color: var(--link); }
code { background: var(--code); padding: 1px 6px; border-radius: 4px; font-size: .9em; word-break: break-all; }
footer { margin-top: 48px; color: var(--muted); font-size: .9rem; }