:root {
  --bg: #ffffff; --fg: #1d232a; --muted: #5b6570; --accent: #0b63c4;
  --panel: #f4f6f8; --border: #dce2e8; --code-bg: #eef1f4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d; --fg: #d9e0e7; --muted: #8b97a3; --accent: #7ab8ff;
    --panel: #191f26; --border: #2a323b; --code-bg: #1e252d;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 17rem; flex: none; background: var(--panel);
  border-right: 1px solid var(--border); padding: 1.4rem 1.1rem 3rem;
}
.sidebar .brand {
  display: block; font-weight: 700; font-size: 1.05rem; color: var(--fg);
  text-decoration: none; padding: .3rem .5rem; border-radius: 6px;
}
.sidebar .brand span { color: var(--muted); font-weight: 500; }
.sidebar h2 {
  font-size: .72rem; letter-spacing: .09em; text-transform: uppercase;
  color: var(--muted); margin: 1.5rem 0 .35rem; padding: 0 .5rem;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li a {
  display: block; padding: .28rem .5rem; border-radius: 6px;
  color: var(--fg); text-decoration: none; font-size: .93rem;
}
.sidebar a:hover { background: var(--code-bg); }
.sidebar a.active { background: var(--accent); color: var(--bg); font-weight: 600; }
.sidebar .brand.active { background: transparent; color: var(--accent); }
main { flex: 1; min-width: 0; padding: 2.6rem 2.2rem 4rem; }
article { max-width: 46rem; margin: 0 auto; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 1.1rem; letter-spacing: -.01em; }
h2 {
  font-size: 1.32rem; margin: 2.3rem 0 .8rem;
  border-bottom: 1px solid var(--border); padding-bottom: .3rem;
}
h3 { font-size: 1.08rem; margin: 1.9rem 0 .6rem; }
h4 { font-size: 1rem; margin: 1.5rem 0 .5rem; }
p { margin: .8rem 0; }
a { color: var(--accent); }
article a { text-underline-offset: 2px; }
code {
  font-family: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas,
    Menlo, monospace;
  font-size: .875em; background: var(--code-bg);
  padding: .1em .35em; border-radius: 4px;
}
pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 8px; padding: .85rem 1rem; overflow-x: auto;
  line-height: 1.5; margin: 1rem 0;
}
pre code { background: none; padding: 0; font-size: .85rem; }
.table-wrap { overflow-x: auto; margin: 1rem 0; }
table { border-collapse: collapse; font-size: .9rem; }
th, td {
  border: 1px solid var(--border); padding: .45rem .65rem;
  text-align: left; vertical-align: top;
}
th { background: var(--panel); }
blockquote {
  margin: 1rem 0; padding: .35rem 1rem;
  border-left: 3px solid var(--accent); background: var(--panel);
  border-radius: 0 8px 8px 0; color: var(--fg);
}
hr { border: none; border-top: 1px solid var(--border); margin: 2.3rem 0; }
ul, ol { padding-left: 1.5rem; margin: .8rem 0; }
li { margin: .3rem 0; }
li > p { margin: .5rem 0; }
li > ul, li > ol { margin: .3rem 0; }
.task { color: var(--muted); }
footer {
  max-width: 46rem; margin: 3.5rem auto 0; padding-top: 1rem;
  border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem;
}
@media (max-width: 880px) {
  .layout { display: block; }
  .sidebar {
    width: auto; border-right: none;
    border-bottom: 1px solid var(--border); padding-bottom: 1.2rem;
  }
  main { padding: 1.6rem 1.1rem 3rem; }
}