:root {
  --border: #e5e7eb;
  --muted: #6b7280;
}

body {
  font:
    16px/1.6 system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Inter,
    Arial,
    sans-serif;
  color: #111827;
  margin: 0;
}

header,
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

header {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

header a {
  color: #2563eb;
  text-decoration: none;
}

h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0.4rem 0 0.25rem;
}

h2 {
  margin: 1.8rem 0 0.6rem;
}

h3 {
  margin: 1.1rem 0 0.35rem;
}

.muted {
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 950px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

.box {
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 1rem;
  background: #fff;
}

pre {
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.75rem;
  overflow: auto;
  background: #fff;
}

code {
  font:
    13px/1.45 ui-monospace,
    SFMono-Regular,
    Menlo,
    Consolas,
    monospace;
}

.pill {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.75rem;
  background: #fff;
  color: #374151;
}

.list {
  margin: 0.35rem 0 0 1rem;
}

.callout {
  border-left: 0.35rem solid #10b981;
  background: #f3fdf8;
}

.warn {
  border-left-color: #ef4444;
  background: #fff7f7;
}