:root {
  color-scheme: light dark;
  --text: #111;
  --muted: #555;
  --line: #ddd;
  --bg: #fff;
  --link: #0b57d0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #eee;
    --muted: #aaa;
    --line: #333;
    --bg: #111;
    --link: #8ab4f8;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
}

h1 { font-size: 1.75rem; margin: 0 0 0.35rem; }
h2 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 0.92rem; }
a { color: var(--link); }
nav { margin-top: 0.75rem; }
nav a { margin-right: 1rem; }
ul { padding-left: 1.2rem; }
footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}