:root {
  --bg: #fbfcfd;
  --fg: #16202b;
  --muted: #5d6b7a;
  --rule: #e2e8ee;
  --accent: #2f6f8f;
  --card: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1418;
    --fg: #dfe7ec;
    --muted: #8b9aa6;
    --rule: #1e2830;
    --accent: #7fb7d4;
    --card: #141c22;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 5rem 1.5rem 6rem;
}

.mark {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 2.5rem;
}

h1 {
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  font-weight: 600;
}

h2 {
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  margin: 2.5rem 0 0.6rem;
  font-weight: 600;
}

p { margin: 0 0 1rem; }

.lede {
  font-size: 1.15rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

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

ul { padding-left: 1.1rem; margin: 0 0 1rem; }
li { margin-bottom: 0.35rem; }

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 3rem 0 1.5rem;
}

footer {
  font-size: 0.85rem;
  color: var(--muted);
}

footer a { margin-right: 1rem; }

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875em;
}

pre {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.updated {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}