:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111418;
  --muted: #5b6573;
  --rule: #e5e8ec;
  --accent: #1a56db;
  --code-bg: #f3f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --fg: #e6e9ee;
    --muted: #9aa3b2;
    --rule: #1f242c;
    --accent: #7ea8ff;
    --code-bg: #161b22;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

header { margin-bottom: 2rem; }

h1 {
  font-size: 2rem;
  margin: 0 0 .25rem;
  letter-spacing: -.01em;
}

h2 {
  font-size: 1.15rem;
  margin: 2rem 0 .5rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.5rem;
}

section:first-of-type h2 {
  border-top: none;
  padding-top: 0;
  margin-top: 1.5rem;
}

p, ul { margin: .6rem 0; }
ul { padding-left: 1.25rem; }
li { margin: .25rem 0; }

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { text-decoration-thickness: 2px; }

code {
  background: var(--code-bg);
  padding: .1rem .35rem;
  border-radius: 4px;
  font-size: .92em;
}

blockquote {
  margin: 1rem 0;
  padding: .75rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--code-bg);
  border-radius: 0 6px 6px 0;
}

.tagline { color: var(--muted); margin: 0; }
.breadcrumb { color: var(--muted); font-size: .9rem; margin: 0 0 .5rem; }
.meta { color: var(--muted); font-size: .9rem; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: .9rem;
}