:root { --accent: #2e5e4e; --bg: #f6f5f1; --fg: #1d1d1b; --muted: #6b6b66; }
@media (prefers-color-scheme: dark) {
  :root { --accent: #7fb59e; --bg: #151614; --fg: #ecebe6; --muted: #a3a29b; }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", sans-serif;
  font-size: 16px;
  line-height: 1.8;
}
main { max-width: 720px; margin: 0 auto; padding: 16px 16px 48px; }
h1 { font-size: 1.3rem; color: var(--accent); }
h2 { font-size: 1.05rem; margin-top: 28px; border-bottom: 1px solid var(--muted); }
ul { padding-left: 1.2em; }
.muted { color: var(--muted); font-size: .9rem; }
a { color: var(--accent); }