:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #0b57d0;
  --rule: #e5e5e5;
  --code-bg: #f4f4f4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #e8e8e8;
    --muted: #9a9a9a;
    --accent: #8ab4f8;
    --rule: #2c2c2c;
    --code-bg: #1e1e1e;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0 auto;
  padding: 1.25rem 1.25rem 4rem;
  max-width: 42rem;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
}

header {
  margin-bottom: 2.5rem;
}

h1 {
  font-size: 2rem;
  font-family: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.tagline {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0;
}

section {
  margin-bottom: 2.25rem;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
}

h3 {
  font-size: 1.05rem;
  margin: 0 0 0.25rem;
}

p {
  margin: 0 0 0.9rem;
}

ul.rules {
  list-style: none;
  margin: 0;
  padding: 0;
}

ul.rules li {
  margin-bottom: 1.25rem;
}

ol.how {
  margin: 0;
  padding-inline-start: 1.4rem;
}

ol.how li {
  margin-bottom: 0.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.languages {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  font-size: 0.85rem;
  margin-bottom: 3rem;
}

.languages .current {
  color: var(--muted);
  font-weight: 600;
}

.meta {
  font-size: 0.9rem;
  color: var(--muted);
}