:root {
  --ink: #1c1c1e;
  --muted: #6b6b70;
  --rule: #e3e3e6;
  --bg: #ffffff;
  --accent: #0b6bcb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f7;
    --muted: #9a9aa0;
    --rule: #35353a;
    --bg: #131316;
    --accent: #6aa9f0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 .5rem;
}

h2 {
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  margin: 2.25rem 0 .5rem;
}

p, ul { margin: 0 0 1rem; }
ul { padding-left: 1.25rem; }
li { margin-bottom: .5rem; }

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

.lede {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.updated, .back {
  color: var(--muted);
  font-size: .9rem;
}

.back { margin-bottom: 2rem; }

.note {
  border-left: 3px solid var(--rule);
  padding: .25rem 0 .25rem 1rem;
  color: var(--muted);
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: .85rem;
}

footer p { margin: 0; }