:root {
  --bg: #F4F2EC;
  --text: #1B2420;
  --muted: #5B6661;
  --link: #0F6B4C;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151C18;
    --text: #EEF0EA;
    --muted: #A3ADA7;
    --link: #6FC8A0;
  }
}
html { background: var(--bg); color: var(--text); }
body {
  margin: 0;
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 24px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--text); }
small, .muted { color: var(--muted); }
a { color: var(--link); }