:root {
  --max-width: 720px; /* for top nav */
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --border: #dddddd;
  --link: #1a0dab;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --fg: #eaeaea;
    --muted: #aaaaaa;
    --border: #2a2a2a;
    --link: #8ab4f8;
  }
}

body {
  font-family: system-ui, serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  color: var(--fg);
  background: var(--bg);
}

a {
  color: var(--link);
}

header, footer {
  padding: 1rem 2rem;
  border-bottom: 1px solid #ddd;
}

.site-title {
  font-weight: 600;
  text-decoration: none;
  color: inherit;
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
}

header nav a {
  margin-left: 1rem;
  text-decoration: none;
  color: var(--muted);
}

header nav a:hover {
  color: var(--fg);
}

footer {
  margin: 0 auto;
  display: flex;
  font-size: 0.95em;
  color: var(--muted);
}

footer p {
  margin: 0 auto;
  padding: 1rem;
}

footer a {
  margin-left: 1rem;
  text-decoration: none;
  color: var(--muted);
}

footer nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
}

footer nav a:hover {
  color: var(--fg);
}

main {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.subnav a {
  margin-right: 1rem;
  color: var(--muted);
}

.subnav a:hover {
  color: var(--fg);
}