:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --rule: #e3e3e6;
  --accent: #0b5fd0;
  --card: #f7f7f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e9e9ec;
    --muted: #9a9aa2;
    --rule: #2a2d34;
    --accent: #79aaff;
    --card: #171a20;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2.5rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

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

h1 {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1.2;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.15rem;
  margin: 2.25rem 0 0.6rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  letter-spacing: -0.01em;
}

.updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 2rem;
}

p, li { margin: 0.7rem 0; }

ul { padding-left: 1.25rem; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.lede {
  font-size: 1.05rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1rem 1.15rem;
}

nav {
  margin: 0 0 2.5rem;
  font-size: 0.9rem;
}

nav a { margin-right: 1.1rem; }

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.85rem;
}