:root {
  --bg: #ffffff;
  --text: #1d1f24;
  --muted: #5d606b;
  --accent: #3b5bdb;
  --border: #dcdde3;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15161a;
    --text: #e8e9ed;
    --muted: #a0a3ad;
    --accent: #8ea2ff;
    --border: #33353d;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header,
main,
footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.25rem;
  border-bottom: 1px solid var(--border);
}

header a.brand {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 1rem;
}

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

main {
  padding-block: 1.5rem 2.5rem;
}

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

h2 {
  font-size: 1.2rem;
  margin-top: 2rem;
}

.muted {
  color: var(--muted);
}

footer {
  padding-block: 1.25rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}