:root { color-scheme: light dark; --bg: #fff; --fg: #1d1d1f; --muted: #6e6e73; --accent: #8a1c2e; --todo: #fff3a3; }
@media (prefers-color-scheme: dark) { :root { --bg: #111; --fg: #f2f2f2; --muted: #a1a1a6; --accent: #e0b84c; --todo: #5c4b00; } }
body { margin: 0 auto; max-width: 42rem; padding: 2rem 1rem 4rem; background: var(--bg); color: var(--fg);
  font: 17px/1.6 ui-serif, Georgia, "Times New Roman", serif; }
h1 { font-size: 2rem; line-height: 1.2; margin-bottom: .25rem; }
h2 { font-size: 1.25rem; margin-top: 2rem; }
a { color: var(--accent); }
.meta, footer { color: var(--muted); font-size: .9rem; }
nav { margin-bottom: 1.5rem; font-size: .95rem; }
mark.todo { background: var(--todo); color: inherit; padding: 0 .2em; }