:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --accent: #2481cc;
  --border: #d9d9de;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181c;
    --text: #f2f2f4;
    --muted: #a0a0a8;
    --accent: #5eb5f7;
    --border: #33353b;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, sans-serif;
}

header {
  border-bottom: 1px solid var(--border);
}

nav {
  display: flex;
  gap: 4px;
  max-width: 40rem;
  margin: 0 auto;
  padding: 4px 8px;
}

nav a {
  padding: 12px;
  color: var(--muted);
  text-decoration: none;
}

nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 600;
}

main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  margin: 8px 0 16px;
  font-size: 1.5rem;
}