:root {
  color-scheme: light dark;
  --text: #1a1a1a;
  --muted: #555;
  --link: #0969da;
  --border: #d8dee4;
  --bg: #fff;
  --nav-bg: #f6f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6edf3;
    --muted: #8b949e;
    --link: #4493f8;
    --border: #30363d;
    --bg: #0d1117;
    --nav-bg: #161b22;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

.site-nav {
  border-bottom: 1px solid var(--border);
  background: var(--nav-bg);
  padding: 0.75rem 1rem;
}

.site-nav ul {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 48rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.site-nav a {
  color: var(--link);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-nav a[aria-current="page"] {
  font-weight: 600;
  color: var(--text);
}

.site-nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

main img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: 4px;
}

main h1 {
  font-size: 1.75rem;
  margin-top: 0;
  line-height: 1.3;
}

.page-toc {
  margin: 1.25rem 0 2rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--nav-bg);
  font-size: 0.95rem;
}

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

.page-toc > ul > li {
  margin: 0.35rem 0;
}

.page-toc > ul > li > ul {
  margin: 0.25rem 0 0.5rem;
  padding-left: 1.25rem;
}

.page-toc > ul > li > ul > li {
  margin: 0.2rem 0;
  font-size: 0.9rem;
}

.page-toc a {
  text-decoration: none;
}

.page-toc a:hover {
  text-decoration: underline;
}

main h2 {
  font-size: 1.35rem;
  margin-top: 2rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border);
}

main h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
}

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

main table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

main th,
main td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

main th {
  background: var(--nav-bg);
}

main code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

main pre code {
  font-size: 0.85em;
}

main hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}