:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #59636e;
  --border: #dcd9d0;
  --accent: #1f5f99;
  --accent-soft: #e6eef6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --surface: #1d2024;
    --text: #e6e6e3;
    --muted: #a0a6ad;
    --border: #33373d;
    --accent: #7cb3e8;
    --accent-soft: #1f2b38;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header,
main,
footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  padding-top: 3rem;
  padding-bottom: 1rem;
}

.brand {
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 0.25rem;
}

h1 {
  font-size: 2.1rem;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h2 {
  font-size: 1.3rem;
  margin: 2.25rem 0 0.5rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.card p:first-child {
  margin-top: 0;
}

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

.note {
  background: var(--accent-soft);
  border-color: transparent;
}

ul {
  padding-left: 1.25rem;
}

li + li {
  margin-top: 0.35rem;
}

code {
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

footer a {
  color: inherit;
}