:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #1f7a4d;
  --background: #ffffff;
  --card: #f5f5f7;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.55;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #4cc38a;
    --background: #000000;
    --card: #1c1c1e;
  }
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
}

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

nav {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

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

h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.2rem;
  margin: 2rem 0 0.5rem;
}

.lede {
  color: var(--muted);
  font-size: 1.1rem;
}

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

footer {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 3rem;
}