:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fdfdfc;
  --muted: #62666e;
  --link: #0a5cc4;
  --border: #e4e4e0;
  --code-bg: #f2f2ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e6;
    --bg: #14161a;
    --muted: #9a9fa8;
    --link: #6cb2ff;
    --border: #2a2d33;
    --code-bg: #1d2025;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

header, footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

header a {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
}

footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
}

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

h1 { font-size: 1.9rem; margin-top: 0.2rem; }
h2 { font-size: 1.3rem; margin-top: 2.2rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
h3 { font-size: 1.05rem; margin-top: 1.6rem; }

code {
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  background: var(--code-bg);
  padding: 0.9rem;
  border-radius: 6px;
  overflow-x: auto;
}

pre code { background: none; padding: 0; }

ul, ol { padding-left: 1.4rem; }

li { margin: 0.3rem 0; }