:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1b1f24;
  --muted: #5b6572;
  --rule: #e2e6ea;
  --accent: #0b5fff;
  --code-bg: #f5f7f9;
  --sidebar-bg: #fafbfc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --fg: #e6edf3;
    --muted: #9aa7b4;
    --rule: #232c37;
    --accent: #6ea8ff;
    --code-bg: #161b22;
    --sidebar-bg: #11161d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.layout { display: flex; min-height: 100vh; align-items: flex-start; }
.sidebar {
  width: 260px;
  flex: 0 0 260px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--rule);
  padding: 28px 20px 48px;
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow-y: auto;
}
.sidebar h1 { font-size: 15px; letter-spacing: 0.02em; margin: 0 0 4px; }
.sidebar .tagline { color: var(--muted); font-size: 13px; margin: 0 0 22px; }
.sidebar h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 22px 0 8px;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 0 0 2px; }
.sidebar a {
  display: block;
  padding: 5px 10px;
  border-radius: 6px;
  color: var(--fg);
  font-size: 14px;
}
.sidebar a:hover { background: var(--rule); text-decoration: none; }
.sidebar a[aria-current="page"] { background: var(--accent); color: #fff; }
main { flex: 1 1 auto; min-width: 0; padding: 40px 44px 96px; max-width: 900px; }
main h1 { font-size: 30px; line-height: 1.25; margin: 0 0 20px; }
main h2 { font-size: 22px; margin: 36px 0 12px; padding-bottom: 6px;
  border-bottom: 1px solid var(--rule); }
main h3 { font-size: 17px; margin: 26px 0 8px; }
main img { max-width: 100%; }
code {
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
}
pre code { background: none; padding: 0; font-size: 13px; line-height: 1.55; }
table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; margin: 18px 0; }
th, td { border: 1px solid var(--rule); padding: 8px 12px; text-align: left; font-size: 14px; }
th { background: var(--code-bg); }
blockquote {
  margin: 18px 0;
  padding: 2px 16px;
  border-left: 3px solid var(--rule);
  color: var(--muted);
}
.header-anchor { color: var(--muted); text-decoration: none; opacity: 0; padding-left: 8px; }
h2:hover .header-anchor, h3:hover .header-anchor { opacity: 1; }
footer {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 13px;
}
@media (max-width: 860px) {
  .layout { display: block; }
  .sidebar { width: auto; flex: none; position: static; max-height: none;
    border-right: none; border-bottom: 1px solid var(--rule); }
  main { padding: 28px 20px 72px; }
}