:root {
  --ink: #0b1220;
  --muted: #5b6b82;
  --accent: #d97706;
  --cyan: #0e7490;
  --rule: #d7dee8;
  --bg: #fff;
}

html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}
h1 { font-size: 2rem; margin: 0 0 0.4em; letter-spacing: -0.02em; }
h1 span { color: var(--accent); }
h2 {
  font-size: 1.25rem;
  margin-top: 2em;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.2em;
}
a { color: var(--cyan); }
nav { font-size: 0.9rem; margin-bottom: 2rem; color: var(--muted); }
nav a { margin-right: 1rem; }
footer { margin-top: 3rem; font-size: 0.85rem; color: var(--muted); }
ul { padding-left: 1.2rem; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: #f4f6f9;
  padding: 1px 4px;
  border-radius: 4px;
}
.lede { color: var(--muted); margin-bottom: 1.4rem; }