:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1c1e;
  --muted: #5a5f66;
  --rule: #e2e5e9;
  --accent: #1f6feb;
  --card: #f6f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --fg: #e6e8ea;
    --muted: #a3aab3;
    --rule: #2b3036;
    --accent: #6ea8fe;
    --card: #1c2126;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2.5rem 1.25rem 5rem;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 44rem;
  margin: 0 auto;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.2;
  margin: 0 0 .35rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.2rem;
  margin: 2.5rem 0 .6rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  letter-spacing: -0.01em;
}

h2:first-of-type { border-top: 0; padding-top: 0; }

p, ul { margin: 0 0 1rem; }
ul { padding-left: 1.25rem; }
li { margin-bottom: .4rem; }

.meta {
  color: var(--muted);
  font-size: .92rem;
  margin-bottom: 2rem;
}

.summary {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 1.1rem 1.25rem;
  margin: 0 0 2rem;
}

.summary p:last-child { margin-bottom: 0; }

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

code {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: .1em .35em;
  font-size: .88em;
  word-break: break-word;
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: .9rem;
}

nav { margin-bottom: 2rem; font-size: .95rem; }
nav a { margin-right: 1.25rem; }