:root {
  --bg: #fbfaf6;
  --fg: #1c2420;
  --muted: #5b665f;
  --accent: #1f6b3a;
  --rule: #dfe3dc;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a17;
    --fg: #e8ece8;
    --muted: #a3ada6;
    --accent: #7fcf97;
    --rule: #2c3530;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

header, main, footer {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1rem;
}

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

header .brand {
  color: var(--fg);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
}

nav a { margin-left: 1rem; }
nav a:first-child { margin-left: 0; }

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

main { padding-top: 1.5rem; padding-bottom: 2rem; }

h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 1rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1rem; margin: 1.25rem 0 0.25rem; }

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

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

footer p { margin: 0.25rem 0; }