:root {
  --bg: #fbfaf7; --panel: #f3f1ec; --text: #1d2330; --muted: #5d6677; --line: #e2ded5;
  --accent: #0d5c8c; --accent-soft: #e3eef6; --code-bg: #f1efe9; --mark: #ffe8a3;
  --note: #0d5c8c; --tip: #1f7a4d; --warning: #a15c00; --danger: #b3261e;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151c; --panel: #171c25; --text: #dfe4ec; --muted: #939cad; --line: #283040;
    --accent: #6cb6e8; --accent-soft: #1b2a3a; --code-bg: #1a202b; --mark: #5a4a12;
    --note: #6cb6e8; --tip: #5fc48f; --warning: #e0a33e; --danger: #ef7a72;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--sans); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar { position: sticky; top: 0; z-index: 10; height: 56px; display: flex; align-items: center; gap: 16px;
  padding: 0 20px; background: var(--bg); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.anchor { color: var(--accent); }
.menu { display: none; background: none; border: 1px solid var(--line); color: var(--text); border-radius: 6px; font-size: 18px; padding: 2px 8px; }
.search { position: relative; margin-left: auto; width: min(420px, 50vw); }
.search input { width: 100%; padding: 7px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--text); font: inherit; font-size: 14px; }
#results { position: absolute; right: 0; top: 42px; width: min(560px, 92vw); max-height: 70vh; overflow: auto; background: var(--bg);
  border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,.15); }
#results a { display: block; padding: 10px 14px; border-bottom: 1px solid var(--line); color: var(--text); }
#results a:hover { background: var(--accent-soft); text-decoration: none; }
#results small { color: var(--muted); margin-left: 8px; }
#results span { display: block; font-size: 13px; color: var(--muted); }
#results .none { padding: 12px 14px; color: var(--muted); }
mark { background: var(--mark); color: inherit; border-radius: 2px; }

.layout { display: grid; grid-template-columns: 250px minmax(0, 1fr) 220px; max-width: 1400px; margin: 0 auto; }
.sidebar { position: sticky; top: 56px; height: calc(100vh - 56px); overflow: auto; padding: 20px 12px 40px 20px; border-right: 1px solid var(--line); font-size: 14px; }
.nav-group { margin-bottom: 18px; }
.nav-title { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; margin: 0 0 6px 8px; }
.sidebar a { display: block; padding: 4px 8px; border-radius: 6px; color: var(--text); }
.sidebar a:hover { background: var(--panel); text-decoration: none; }
.sidebar a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

main { padding: 28px 48px 60px; min-width: 0; }
.crumb { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
article h1 { font-size: 2.1rem; line-height: 1.2; margin: 6px 0 8px; }
.lede { font-size: 1.15rem; color: var(--muted); margin-top: 0; }
article h2 { margin-top: 2.4em; padding-top: .4em; border-top: 1px solid var(--line); font-size: 1.5rem; }
article h3 { margin-top: 1.8em; font-size: 1.15rem; }
.headerlink { opacity: 0; margin-left: 6px; font-weight: 400; }
h2:hover .headerlink, h3:hover .headerlink { opacity: .6; }
article img { max-width: 100%; }
code { font-family: var(--mono); font-size: .88em; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre { background: var(--code-bg); padding: 14px 16px; border-radius: 8px; overflow: auto; font-size: 13.5px; line-height: 1.3; border: 1px solid var(--line); }
pre code { background: none; padding: 0; font-size: inherit; }
table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 14.5px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
th { background: var(--panel); }
blockquote { margin: 1.2em 0; padding: 10px 18px; border-left: 4px solid var(--accent); background: var(--panel); border-radius: 0 8px 8px 0; }
blockquote p { margin: .4em 0; }
blockquote .src { display: block; font-size: 13px; color: var(--muted); }
hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }

.admonition { border: 1px solid var(--line); border-left: 4px solid var(--note); background: var(--panel); border-radius: 8px; padding: 10px 16px; margin: 1.2em 0; }
.admonition-title { font-weight: 700; margin: 0 0 4px; }
.admonition.tip { border-left-color: var(--tip); } .admonition.tip .admonition-title { color: var(--tip); }
.admonition.warning { border-left-color: var(--warning); } .admonition.warning .admonition-title { color: var(--warning); }
.admonition.danger { border-left-color: var(--danger); } .admonition.danger .admonition-title { color: var(--danger); }
.admonition.note .admonition-title { color: var(--note); }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; margin: 1.2em 0; }
.card { display: block; border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; background: var(--panel); color: var(--text); }
.card:hover { border-color: var(--accent); text-decoration: none; }
.card b { display: block; color: var(--accent); margin-bottom: 4px; }
.card span { font-size: 14px; color: var(--muted); }

.prevnext { display: flex; justify-content: space-between; gap: 12px; margin-top: 48px; }
.pn { flex: 1; border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; color: var(--text); }
.pn:hover { border-color: var(--accent); text-decoration: none; }
.pn span { display: block; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.pn.next { text-align: right; }
footer { margin-top: 40px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; }

.toc { position: sticky; top: 56px; height: calc(100vh - 56px); overflow: auto; padding: 28px 16px; font-size: 13px; }
.toc-title { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; margin-bottom: 6px; }
.toc ul { list-style: none; padding-left: 0; margin: 0; }
.toc ul ul { padding-left: 12px; }
.toc a { display: block; padding: 3px 0; color: var(--muted); }
.toc a:hover { color: var(--accent); }

/* pygments (codehilite) — neutral palette that works in both modes */
.hl .c, .hl .c1, .hl .cm { color: var(--muted); font-style: italic; }
.hl .k, .hl .kd, .hl .nb { color: #a0522d; }
.hl .s, .hl .s1, .hl .s2 { color: #2e7d32; }
.hl .nv, .hl .nt, .hl .na { color: var(--accent); }
.hl .m, .hl .mi { color: #8e44ad; }

@media (max-width: 1150px) { .layout { grid-template-columns: 240px minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .menu { display: block; }
  .sidebar { display: none; position: fixed; top: 56px; left: 0; width: 280px; background: var(--bg); z-index: 9; box-shadow: 0 0 30px rgba(0,0,0,.2); }
  body.nav-open .sidebar { display: block; }
  main { padding: 20px 18px 50px; }
  .brand { font-size: 15px; }
}