:root {
  --ok: #2e7d32; --ok-soft: #dcefdc;
  --bg: #f7f4ee; --surface: #fffdf8; --ink: #22201c; --muted: #6b645a; --line: #e2dccf;
  --accent: #a0620f; --accent-soft: #f3e3c4; --warn: #9b2c1c; --warn-soft: #f6dcd5;
  --code: #efe9dc; --radius: 10px; --nav-w: 270px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1a17; --surface: #23211d; --ink: #ece6da; --muted: #a39b8d; --line: #3a362f;
    --ok: #7fcf86; --ok-soft: #22382a;
    --accent: #e8b04a; --accent-soft: #3d3222; --warn: #f08a70; --warn-soft: #43261f; --code: #2d2a24;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.6; font-size: 16px; }
a { color: var(--accent); text-underline-offset: 2px; }
a.ext::after { content: "↗"; font-size: .75em; margin-left: 1px; opacity: .7; }
code { background: var(--code); padding: .1em .35em; border-radius: 4px; font-size: .9em; }
pre { background: var(--code); padding: .8em 1em; border-radius: var(--radius); overflow-x: auto; }
pre code { background: none; padding: 0; }

.top { position: sticky; top: 0; z-index: 10; display: flex; gap: 12px; align-items: center;
  padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--line); }
.brand { display: flex; gap: 8px; align-items: center; font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap; }
.burger { display: none; background: none; border: 1px solid var(--line); color: var(--ink); border-radius: 8px;
  font-size: 18px; padding: 4px 10px; cursor: pointer; }
.search { position: relative; flex: 1; max-width: 520px; margin-left: auto; }
.search input { width: 100%; padding: 8px 12px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink); font-size: 15px; }
.suggest { position: absolute; left: 0; right: 0; top: calc(100% + 6px); background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 24px rgb(0 0 0 / .15); overflow: hidden; }
.suggest a { display: block; padding: 8px 12px; color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line); }
.suggest a:last-child { border-bottom: 0; }
.suggest a:hover, .suggest a.active { background: var(--accent-soft); }
.suggest small { display: block; color: var(--muted); font-size: 12px; }

.layout { display: grid; grid-template-columns: var(--nav-w) minmax(0, 1fr); max-width: 1240px; margin: 0 auto; }
.nav { padding: 18px 12px 40px 16px; border-right: 1px solid var(--line); font-size: 14.5px;
  position: sticky; top: 55px; align-self: start; max-height: calc(100vh - 55px); overflow-y: auto; }
.nav ul { list-style: none; margin: 0; padding-left: 12px; }
.nav .tree { padding-left: 0; }
.nav li { margin: 2px 0; }
.nav a, .nav span { display: block; padding: 3px 8px; border-radius: 6px; color: var(--ink); text-decoration: none; }
.nav .folder > a, .nav .folder > span { font-weight: 600; }
.nav a:hover { background: var(--accent-soft); }
.nav a[aria-current] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.nav .home { font-weight: 600; }
.nav .extra { margin-top: 16px; padding-top: 10px; border-top: 1px solid var(--line); padding-left: 0; }

main { padding: 24px 32px 60px; min-width: 0; }
.page { max-width: 820px; }
.page h1 { font-size: 2rem; line-height: 1.2; margin: .2em 0 .3em; }
.page h2 { margin-top: 1.8em; padding-bottom: .2em; border-bottom: 1px solid var(--line); font-size: 1.35rem; }
.page h3 { margin-top: 1.4em; font-size: 1.1rem; }
.anchor { margin-left: .4em; opacity: 0; text-decoration: none; font-weight: 400; }
h2:hover .anchor, h3:hover .anchor { opacity: .5; }
.crumbs { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 4px; font-size: 13.5px; color: var(--muted); }
.crumbs li + li::before { content: "›"; margin-right: 4px; }
.meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.badge, .chip { font-size: 12px; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); white-space: nowrap; }
.badge.kind { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.badge.draft, .badge.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.aliases { color: var(--muted); font-size: 14px; margin: 0; }
.summary { font-size: 1.08rem; color: var(--muted); }
.toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 14px; margin: 12px 0; }
.toc summary { cursor: pointer; font-weight: 600; }
.toc ul { list-style: none; padding-left: 0; margin: 6px 0; columns: 2 220px; }
.toc .l3 { padding-left: 14px; font-size: .92em; }
.table { overflow-x: auto; margin: 1em 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; background: var(--surface); }
th, td { padding: 7px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--code); position: sticky; top: 0; }
tr:last-child td { border-bottom: 0; }
blockquote { margin: 1em 0; padding: .4em 1em; border-left: 4px solid var(--accent); background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; }
.task { list-style: none; margin-left: -1.4em; }
.task input { margin-right: .5em; }
.tag { font-size: .85em; color: var(--accent); background: var(--accent-soft); padding: 0 .35em; border-radius: 4px; }
a[href*="sources.html#src-"]:not(.ext) { font-size: .8em; vertical-align: super; text-decoration: none; }
.cards { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
.cards li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; }
.cards li > a { font-weight: 600; }
.cards p { margin: 4px 0 0; font-size: 14px; color: var(--muted); }
.cards time { font-size: 12px; color: var(--muted); }
.refs ol { font-size: 14.5px; }
.file { margin-top: 3em; font-size: 13px; color: var(--muted); }
.entries { list-style: none; padding: 0; }
.entry { padding: 10px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 70px; }
.entry:target { background: var(--accent-soft); border-radius: 6px; padding: 10px; }
.etitle { font-weight: 600; }
.emeta, .citedby { font-size: 13px; color: var(--muted); margin: 2px 0; }
.entry p { margin: 4px 0; font-size: 14.5px; }
.filter { width: 100%; padding: 8px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); margin: 8px 0 4px; }
.results .hit { padding: 10px 0; border-bottom: 1px solid var(--line); }
.results .hit a { font-weight: 600; }
.results .hit p { margin: 2px 0; color: var(--muted); font-size: 14px; }
mark { background: var(--accent-soft); color: inherit; padding: 0 1px; }
footer { text-align: center; font-size: 13px; color: var(--muted); padding: 20px 16px 40px; border-top: 1px solid var(--line); }

@media (max-width: 860px) {
  .layout { display: block; }
  .burger { display: inline-block; }
  .nav { position: fixed; inset: 55px 0 0 0; max-height: none; background: var(--surface); z-index: 9;
    transform: translateX(-100%); transition: transform .2s; border-right: 0; width: min(85vw, 340px); visibility: hidden; }
  body.nav-open .nav { transform: none; visibility: visible; box-shadow: 4px 0 20px rgb(0 0 0 / .2); }
  main { padding: 16px 16px 40px; }
  .brand { font-size: 0; gap: 0; }
  .page h1 { font-size: 1.6rem; }
}
@media print { .top, .nav, footer, .toc { display: none; } .layout { display: block; } }

/* figures: images sit on a light card so line drawings stay readable in dark mode */
figure { margin: 1.4em 0; text-align: center; }
figure img, .body img { max-width: 100%; height: auto; background: #fff; border-radius: var(--radius);
  border: 1px solid var(--line); padding: 6px; }
figure .zoom { display: block; cursor: zoom-in; }
figure img[src$=".svg"] { width: 100%; max-width: 760px; }
figcaption { font-size: 14px; color: var(--muted); margin-top: 6px; }
figcaption .credit { display: block; font-size: 12px; }
figcaption .note { display: block; color: var(--ink); margin-top: 2px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin: 1.2em 0; }
.gallery figure { margin: 0; }
.gallery figcaption { font-size: 13px; }
@media (max-width: 480px) { .gallery { grid-template-columns: 1fr 1fr; gap: 8px; } }
.lightbox { position: fixed; inset: 0; z-index: 50; background: rgb(0 0 0 / .85); display: flex;
  align-items: center; justify-content: center; padding: 16px; cursor: zoom-out; }
.lightbox img { max-width: 100%; max-height: 100%; background: #fff; border-radius: 8px; }
.lightbox img[src$=".svg"] { width: min(100%, 1100px); }

/* verification */
.badge.verified { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.unverified-banner { background: var(--warn-soft); color: var(--warn); border-left: 4px solid var(--warn);
  border-radius: 0 var(--radius) var(--radius) 0; padding: 10px 14px; margin: 10px 0 14px; font-size: 15px; }
.unverified-banner strong { white-space: nowrap; }
.nav a.unverified::after { content: " ⚠"; color: var(--warn); font-size: .85em; }
.nav a.verified::after { content: " ✓"; color: var(--ok); font-size: .85em; }
.verified-note { background: var(--ok-soft); color: var(--ok); border-left: 4px solid var(--ok);
  border-radius: 0 var(--radius) var(--radius) 0; padding: 10px 14px; margin: 10px 0 14px; font-size: 15px; }
blockquote.callout-warn { border-left-color: var(--warn); background: var(--warn-soft); }
blockquote.callout-warn > p:first-child strong:first-child { color: var(--warn); }

/* collapsible menu: a folder is a <details>, open only around the current page */
.nav details > summary { list-style: none; display: flex; align-items: center; cursor: pointer; }
.nav details > summary::-webkit-details-marker { display: none; }
.nav details > summary::before { content: "▸"; width: 14px; flex: none; color: var(--muted); font-size: 12px;
  transition: transform .15s; }
.nav details[open] > summary::before { transform: rotate(90deg); }
.nav details > summary > a, .nav details > summary > span { flex: 1; }