:root {
  color-scheme: light dark;
  --text: #1a1a1a;
  --muted: #555;
  --bg: #fff;
  --link: #0969da;
  --border: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6e6e6;
    --muted: #aaa;
    --bg: #0d1117;
    --link: #58a6ff;
    --border: #30363d;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1.5rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
}

h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin-top: 0;
}

h2 {
  font-size: 1.25rem;
  margin-top: 2rem;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

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

nav.links {
  margin: 2rem 0;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

nav.links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

nav.links li {
  margin: 0.5rem 0;
}

ul {
  padding-left: 1.25rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
}

a.btn {
  display: inline-block;
  margin: 0.5rem 0 1rem;
  padding: 0.75rem 1.25rem;
  background: var(--link);
  color: #fff;
  text-decoration: none;
  border-radius: 0.375rem;
  font-weight: 600;
}

a.btn:hover {
  filter: brightness(1.08);
}

a.btn:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
}

@media print {
  body {
    padding: 0;
  }
  nav.links {
    display: none;
  }
}