:root {
  --fg: #1f2328;
  --bg: #ffffff;
  --muted: #59636e;
  --accent: #0969da;
  --border: #d1d9e0;
  --code-bg: #f6f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --bg: #0d1117;
    --muted: #9198a1;
    --accent: #4493f8;
    --border: #3d444d;
    --code-bg: #161b22;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 17px;
}

body {
  max-width: 48rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

h1,
h2,
h3,
h4 {
  line-height: 1.25;
  margin: 2rem 0 0.75rem;
}

h1 {
  font-size: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3em;
}

h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3em;
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

code {
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  border: 1px solid var(--border);
}

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

blockquote {
  margin: 1rem 0;
  padding: 0 1rem;
  color: var(--muted);
  border-left: 4px solid var(--border);
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
  display: block;
  overflow-x: auto;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.75rem;
  text-align: left;
}

th {
  background: var(--code-bg);
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

#TOC {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.92rem;
}

#TOC ul {
  padding-left: 1.1rem;
  margin: 0.25rem 0;
}

header#title-block-header {
  margin-bottom: 1.5rem;
}

header .subtitle,
header .author,
header .date {
  color: var(--muted);
  margin: 0.25rem 0;
}

#TOC li.toc-h3 {
  margin-left: 1.1rem;
}