:root {
  --max-width: 52rem;
  --sidebar-width: 14rem;
  --gap: 2rem;
  --fg: #1a1a1a;
  --fg-muted: #555;
  --bg: #fff;
  --bg-alt: #f6f8fa;
  --border: #d0d7de;
  --link: #0969da;
  --link-hover: #0550ae;
  --code-bg: #f6f8fa;
  --active: #0969da;
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --fg-muted: #8b949e;
    --bg: #0d1117;
    --bg-alt: #161b22;
    --border: #30363d;
    --link: #58a6ff;
    --link-hover: #79c0ff;
    --code-bg: #161b22;
    --active: #58a6ff;
  }
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

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

header {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

header nav {
  max-width: calc(var(--max-width) + var(--sidebar-width) + var(--gap));
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.site-logo {
  height: 1.4rem;
  width: 1.4rem;
}

header nav a { color: var(--fg-muted); text-decoration: none; }
header nav a:hover { color: var(--fg); }

.container {
  max-width: calc(var(--max-width) + var(--sidebar-width) + var(--gap));
  margin: 0 auto;
  display: flex;
  gap: var(--gap);
  padding: 2rem 1.5rem;
}

aside { width: var(--sidebar-width); flex-shrink: 0; }

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  position: sticky;
  top: 4rem;
}

.sidebar a {
  color: var(--fg-muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}

.sidebar a:hover { color: var(--fg); background: var(--bg-alt); }
.sidebar a.active { color: var(--active); font-weight: 600; background: var(--bg-alt); }

.sidebar-children {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border);
  margin-left: 0.5rem;
}

main { flex: 1; min-width: 0; }

article h1 { font-size: 1.75rem; margin-bottom: 1rem; line-height: 1.3; }
article h2 { font-size: 1.35rem; margin-top: 2rem; margin-bottom: 0.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
article h3 { font-size: 1.1rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }
article h4 { font-size: 1rem; margin-top: 1.25rem; margin-bottom: 0.5rem; }
article p { margin-bottom: 1rem; }
article ul, article ol { margin-bottom: 1rem; padding-left: 1.5rem; }
article li { margin-bottom: 0.25rem; }
article a { color: var(--link); text-decoration: none; }
article a:hover { color: var(--link-hover); text-decoration: underline; }

article dl { margin-bottom: 1rem; }
article dt { font-weight: 600; margin-top: 0.75rem; }
article dd { margin-left: 1.5rem; margin-bottom: 0.5rem; }

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow-x: auto;
  margin-bottom: 1rem;
  line-height: 1.5;
}

pre code { background: none; padding: 0; border-radius: 0; }

blockquote {
  border-left: 3px solid var(--active);
  padding: 0.5rem 1rem;
  color: var(--fg-muted);
  background: var(--bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 1rem;
}

blockquote p:last-child { margin-bottom: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
}

td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tr:hover td { background: var(--bg-alt); }

.page-item {
  margin-bottom: 1.5rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s;
}

.page-item:hover { border-color: var(--active); }
.page-item h2 { margin: 0 0 0.25rem; font-size: 1.1rem; border: none; padding: 0; }
.page-item p { color: var(--fg-muted); margin: 0; }

.page-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.page-footer a { color: var(--fg-muted); text-decoration: none; }
.page-footer a:hover { color: var(--link); text-decoration: underline; }

@media (max-width: 48rem) {
  .container { flex-direction: column; padding: 1rem; }
  aside { width: 100%; }
  .sidebar {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.25rem;
    position: static;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
  }
  .sidebar-children {
    border-left: none;
    margin-left: 0;
    padding-left: 0;
    flex-direction: row;
    flex-wrap: wrap;
  }
}