:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --link: #0066cc;
  --link-hover: #004499;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #e0e0e0;
    --link: #7ab8ff;
    --link-hover: #aaccff;
  }
}

html {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  max-width: 680px;
  margin: 0 auto;
  padding: 1em;
}

body {
  background: var(--bg);
  color: var(--fg);
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

main {
  min-height: 60vh;
}

footer {
  margin-top: 2em;
  font-size: 0.9em;
  opacity: 0.7;
}