:root { --bg: #ffffff; --fg: #1d1d1f; --muted: #5f6368; --line: #e3e3e6; --accent: #0a6cbf; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #111214; --fg: #f2f2f4; --muted: #a8abb2; --line: #2c2e33; --accent: #6cb6ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
nav { display: flex; gap: 16px; font-size: 14px; margin-bottom: 24px; }
a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.4; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 36px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
h3 { font-size: 17px; margin: 24px 0 4px; }
.lead, .meta { color: var(--muted); }
.meta { font-size: 14px; }
footer { margin-top: 48px; font-size: 13px; color: var(--muted); }