/* ggchord documentation: one semantic palette, two distinct navigation levels. */
:root {
  --accent: #087f75;
  --coral: #e64b35;
  --gold: #d59b17;
  --ink: #203d46;
  --body-ink: #35464a;
  --paper: #fffefa;
  --canvas: #f7f4eb;
  --rule: #d9e1da;
  --code-paper: #f1f5ef;
  --gg-soft: #e7f3ec;
  --gg-line: var(--rule);
  --gg-muted: #526865;
  --bs-primary: #087f75;
  --bs-link-color: #08786f;
  --bs-link-hover-color: #b83728;
}
[data-bs-theme=dark] {
  --accent: #65d8bb;
  --coral: #ff8e79;
  --gold: #f4cd64;
  --ink: #edf6eb;
  --body-ink: #d1ded7;
  --paper: #162b30;
  --canvas: #102126;
  --rule: #365053;
  --code-paper: #1b3437;
  --gg-soft: #22433f;
  --gg-muted: #b0cac3;
  --bs-link-color: #78dfc4;
  --bs-link-hover-color: #ffc09c;
}
body {
  padding-top: 90px !important;
  color: var(--body-ink);
  background: var(--canvas);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.8;
}
.container { max-width: 1640px; padding-inline: 28px; }
.navbar {
  min-height: 78px;
  border-top: 4px solid var(--accent);
  border-bottom: 1px solid var(--rule);
  background: var(--paper) !important;
  box-shadow: 0 3px 18px #183f3210 !important;
}
.navbar.headroom { transform: none !important; }
.navbar .container { max-width: 1640px; gap: 8px; }
.navbar .navbar-brand { font-size: 1.55rem; font-weight: 800; letter-spacing: -.04em; color: var(--ink); }
.navbar .nav-link { font-size: 1.03rem; font-weight: 600; color: var(--ink) !important; padding-inline: 12px; }
.navbar .nav-link:hover, .navbar .nav-link.active { color: var(--accent) !important; }
.navbar .dropdown-item { font-size: .96rem; padding-block: .55rem; }
.navbar .dropdown-item:hover { background: var(--gg-soft); }
.navbar .nav-text { font-size: .76rem; color: var(--gg-muted); }
.navbar-collapse { order: 2; }
.navbar-toggler { order: 4; }
.language-control { position: relative; order: 3; margin-left: 8px; font-size: .96rem; flex-shrink: 0; }
.language-control summary {
  cursor: pointer; list-style: none; border: 1px solid var(--accent);
  border-radius: 8px; padding: 7px 11px; color: var(--ink); background: var(--gg-soft); font-weight: 650;
}
.language-control summary::-webkit-details-marker { display: none; }
.language-control nav {
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 160px; z-index: 1100;
  background: var(--paper); border: 1px solid var(--rule); border-radius: 8px; padding: 6px;
  box-shadow: 0 8px 24px #163e3226;
}
.language-control a { display: block; padding: 7px 12px; color: var(--ink); text-decoration: none; border-radius: 4px; }
.language-control a:hover, .language-control a[aria-current] { background: var(--gg-soft); color: var(--accent); }
.local-search { position: relative; max-width: 190px; margin-left: 8px; }
.local-search input { font-size: .9rem; border-color: var(--rule); background: var(--canvas); padding: .5rem .65rem; }
.search-results:empty { display: none; }
.search-results {
  position: absolute; right: 0; top: 100%; z-index: 1100; min-width: 280px; max-width: min(420px,90vw);
  max-height: 65vh; overflow: auto; padding: 16px; background: var(--paper); border: 1px solid var(--rule); box-shadow: 0 8px 24px #163e3226;
}
.search-results a { display: block; font-size: .9rem; padding: 8px 0; border-bottom: 1px solid var(--rule); }
.search-count { font-size: .8rem; color: var(--gg-muted); }
.doc-layout {
  display: grid; grid-template-columns: 170px minmax(0,1fr) 235px; gap: 28px; align-items: start;
  margin-inline: 0 !important;
}
.doc-layout > main.col-md-9, .doc-layout > aside.col-md-3 { width: auto; max-width: none; }
.doc-layout > main {
  grid-column: 2; grid-row: 1; min-width: 0; min-height: 80vh; padding: 30px 36px 64px;
  border-inline: 1px solid var(--rule); background: var(--paper); overflow-wrap: break-word;
}
.page-nav { grid-column: 1; grid-row: 1; }
.chapter-nav { grid-column: 3; grid-row: 1; }
.page-nav, .chapter-nav {
  position: sticky; top: 104px; max-height: calc(100vh - 120px); overflow: auto; padding: 26px 0;
  font-size: .85rem; scrollbar-width: thin;
}
.navigation-title { font-size: .9rem; font-weight: 800; color: var(--ink); margin: 0 0 16px; }
.page-nav ul { list-style: none; padding: 0; margin: 0; }
.page-nav a { display: block; line-height: 1.55; padding: 6px 8px; color: var(--gg-muted); text-decoration: none; border-left: 2px solid var(--rule); }
.page-nav a:hover, .page-nav a[aria-current] { color: var(--accent); border-left-color: var(--accent); background: var(--gg-soft); }
.chapter-nav section, .chapter-drawer section { margin: 0 0 22px; }
.chapter-group { color: var(--ink); font-size: .85rem; font-weight: 750; margin: 0 0 5px; }
.chapter-nav section:nth-of-type(2) .chapter-group { color: var(--coral); }
.chapter-nav section:nth-of-type(3) .chapter-group { color: var(--accent); }
.chapter-nav section:nth-of-type(4) .chapter-group { color: var(--gold); }
.chapter-nav a, .chapter-drawer nav a { display: block; padding: 5px 9px; color: var(--gg-muted); line-height: 1.55; text-decoration: none; border-left: 2px solid transparent; }
.chapter-nav a:hover, .chapter-drawer a:hover { color: var(--accent); background: var(--gg-soft); }
.chapter-nav a[aria-current=page], .chapter-drawer a[aria-current=page] { font-weight: 700; color: var(--accent); border-color: var(--accent); background: var(--gg-soft); }
.chapter-drawer, .page-outline { display: none; }
main h1 { font-size: 2.45rem; line-height: 1.25; color: var(--ink); letter-spacing: -.035em; font-weight: 800; margin-bottom: 1.4rem; }
main h2 { font-size: 1.55rem; color: var(--ink); line-height: 1.4; margin-top: 2.5rem; padding-top: 1.65rem; border-top: 2px solid var(--rule); }
main h3 { font-size: 1.17rem; color: var(--ink); line-height: 1.5; margin-top: 1.8rem; }
main p { margin-bottom: 1.1rem; }
main p, main li { line-height: 1.85; }
main a { text-underline-offset: .2em; text-decoration-thickness: 1px; }
main img { max-width: 100%; height: auto; }
main .package-logo, body:not([data-page=index]) main img.logo { display: none !important; }
body[data-page=index] main .package-logo { display: block !important; float: right; width: 320px; height: 320px; margin: 0 0 18px 24px; object-fit: contain; }
.candidate-note { color: var(--gg-muted); font: .74rem/1.7 ui-monospace, monospace; margin-bottom: 22px; }
.reference-language-note { border-left: 3px solid var(--accent); padding: 12px 16px; background: var(--gg-soft); font-size: .87rem; }
main pre { overflow: auto; white-space: pre; font-size: .86rem; line-height: 1.65; padding: 20px !important; background: var(--code-paper) !important; }
main code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; overflow-wrap: anywhere; }
main pre code { overflow-wrap: normal; }
main pre a { color: inherit; text-decoration: none; }
main pre a:hover { text-decoration: underline; }
details.code-disclosure { position: relative; border: 1px solid var(--rule); border-radius: 7px; overflow: hidden; margin-block: 22px; }
details.code-disclosure summary { padding: 7px 120px 7px 14px; font: .78rem/1.8 ui-monospace, monospace; background: var(--code-paper); color: var(--gg-muted); cursor: pointer; }
details.code-disclosure pre { margin: 0; border: 0; border-radius: 0; }
.btn-copy-ex { display: none; }
.copy-code { position: absolute; right: 8px; top: 4px; padding: 2px 9px; border: 1px solid var(--rule); border-radius: 4px; background: var(--paper); color: var(--ink); font-size: .75rem; }
.copy-code:focus-visible, .figure-link:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.preparation { border: 1px solid var(--rule); border-radius: 7px; padding: 14px 18px; background: var(--canvas); margin-block: 20px; }
.preparation > summary { color: var(--ink); font-size: .9rem; font-weight: 700; cursor: pointer; }
main table { width: 100%; display: table; font-size: .9rem; border: 1px solid var(--rule); margin-block: 22px; }
main th { background: var(--gg-soft); color: var(--ink); }
main td, main th { padding: 10px !important; vertical-align: top; border-color: var(--rule) !important; overflow-wrap: anywhere; }
.lesson-intro { font-size: 1.13rem; color: var(--ink); }
.lesson-goal, .lesson-check { border-left: 4px solid var(--accent); background: var(--gg-soft); padding: 16px 20px; margin-block: 24px; }
.lesson-check { border-left-color: var(--gold); }
.lesson-path { font: .8rem/1.8 ui-monospace, monospace; color: var(--gg-muted); margin-block: 20px; }
.home-intro { display: flow-root; padding: 12px 0 28px; border-bottom: 3px solid var(--accent); margin-bottom: 24px; }
.eyebrow { font: .7rem/1.8 ui-monospace, monospace; color: var(--accent); letter-spacing: .09em; }
.home-lead { font-size: clamp(1.9rem,3vw,2.7rem); font-weight: 800; letter-spacing: -.04em; color: var(--ink); line-height: 1.25 !important; }
.home-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin-top: 24px; font-size: .95rem; }
.home-actions a { text-decoration: none; }
.primary-action { padding: 10px 18px; color: white !important; background: var(--accent); border-radius: 6px; font-weight: 650; }
.primary-action:hover { background: #066359; }
.route-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; margin-block: 24px; }
.route-card { display: block; border: 1px solid var(--rule); border-top: 4px solid var(--accent); border-radius: 7px; padding: 20px; text-decoration: none; background: var(--paper); }
.route-card:nth-child(3n+1) { border-top-color: var(--coral); }
.route-card:nth-child(3n) { border-top-color: var(--gold); }
.route-card:hover { background: var(--gg-soft); }
.route-card strong { display: block; color: var(--ink); font-size: 1rem; margin-bottom: 6px; }
.route-card span { display: block; font-size: .87rem; line-height: 1.7; color: var(--gg-muted); }
.documentation-figure { clear: both; padding: 8px; margin-block: 26px; border: 1px solid var(--rule); border-radius: 8px; background: #fffcf5; }
.documentation-figure > a { display: block; }
.documentation-figure img { display: block; width: 100%; background: #fffcf5; }
main figcaption { padding: 10px 8px 3px; font-size: .8rem; line-height: 1.6; color: #516159; }
.figure-hint { white-space: nowrap; text-decoration: underline; text-underline-offset: .2em; }
.mode-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
.mode-card { min-width: 0; }
.mode-card h3 { font-size: 1rem; }
.mode-card img { width: 100%; }
.gallery-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 22px; }
.gallery-card { min-width: 0; padding-bottom: 16px; border-bottom: 1px solid var(--rule); }
.gallery-card h3 { font-size: 1rem; min-height: 3em; }
.gallery-card .documentation-figure img { height: 260px; object-fit: contain; }
.gallery-card figcaption { display: none; }
.gallery-card p, .asset-size { font-size: .83rem; }
.next-step { display: block; border-top: 1px solid var(--rule); padding-top: 18px; margin-top: 30px; }
.figure-backdrop { position: fixed; inset: 0; z-index: 2000; display: grid; place-items: center; background: #102b26c9; }
.figure-backdrop[hidden] { display: none; }
.figure-viewer { width: 96vw; max-width: 2000px; height: 94vh; overflow: hidden; border: 1px solid var(--rule); border-radius: 10px; background: var(--paper); color: var(--ink); }
.figure-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--rule); }
.figure-toolbar strong { flex: 1 1 260px; font-size: .92rem; }
.figure-toolbar button { padding: 4px 10px; color: var(--ink); background: var(--gg-soft); border: 1px solid var(--rule); border-radius: 4px; }
.figure-toolbar a { font-size: .86rem; }
.figure-canvas { overflow: auto; max-height: calc(94vh - 90px); padding: 8px; background: #fffcf5; }
.figure-canvas img { display: block; width: auto; height: auto; max-width: 100%; max-height: calc(94vh - 140px); margin: auto; }
.native-size .figure-canvas img { max-width: none; max-height: none; width: auto; margin: 0; }
footer { border-top: 1px solid var(--rule); font-size: .8rem; color: var(--gg-muted); padding-top: 20px; }
@media (min-width: 992px) and (max-width: 1239px) {
  .navbar .nav-link { font-size: .95rem; padding-inline: 7px; }
  .navbar .nav-text { display: none; }
  .local-search { max-width: 145px; }
  .language-control { font-size: .87rem; }
}
@media (max-width: 1199px) {
  .doc-layout { grid-template-columns: minmax(0,1fr) 225px; gap: 20px; }
  .doc-layout > main { grid-column: 1; padding-inline: 28px; }
  .page-nav { display: none; }
  .chapter-nav { grid-column: 2; }
  .page-outline { display: block; border-left: 3px solid var(--accent); background: var(--gg-soft); padding: 10px 16px; margin-bottom: 22px; }
  .page-outline summary { cursor: pointer; color: var(--ink); font-size: .9rem; font-weight: 650; }
  .page-outline ul { padding-left: 18px; margin: 10px 0; font-size: .9rem; }
}
@media (max-width: 991.98px) {
  .navbar-collapse { width: 100%; order: 5; }
  .language-control { margin-left: auto; }
  .local-search { max-width: none; margin: 12px 0; }
  .search-results { left: 0; right: auto; min-width: 100%; }
  .navbar .nav-link { font-size: 1rem; }
}
@media (max-width: 899px) {
  .container { padding-inline: 14px; }
  .doc-layout { display: block; }
  .chapter-nav, .page-nav { display: none; }
  .chapter-drawer { display: block; padding: 10px 14px; margin-bottom: 20px; border: 1px solid var(--accent); border-radius: 6px; background: var(--gg-soft); }
  .chapter-drawer summary { cursor: pointer; font-size: .9rem; font-weight: 700; color: var(--ink); }
  .chapter-drawer nav { max-height: 65vh; overflow: auto; padding-top: 14px; }
  .doc-layout > main { padding: 24px; border: 0; }
  main h1 { font-size: 2rem; }
}
@media (max-width: 650px) {
  body { font-size: 16px; }
  .container { padding-inline: 0; }
  .navbar .container { padding-inline: 16px; }
  .navbar .navbar-brand { font-size: 1.4rem; }
  .navbar .nav-text { display: none; }
  .language-control summary { padding: 5px 8px; }
  .doc-layout > main { padding: 20px 16px 40px; }
  main h1 { font-size: 1.8rem; }
  main h2 { font-size: 1.35rem; }
  main pre { font-size: .78rem; padding: 14px !important; }
  main table { display: block; overflow-x: auto; }
  body[data-page=index] main .package-logo { width: 140px; height: 140px; float: right; margin: 0 0 10px 12px; }
  .home-intro .eyebrow { display: none; }
  .home-intro .home-lead { font-size: 1.7rem; }
  .route-grid, .gallery-grid, .mode-grid { grid-template-columns: 1fr; }
  .home-actions { gap: 12px; }
  .documentation-figure { padding: 4px; margin-inline: -3px; }
  .figure-viewer { width: 98vw; }
  .figure-toolbar strong { flex-basis: 100%; }
  .figure-canvas { max-height: calc(94vh - 130px); }
}
@media print {
  .navbar, .chapter-nav, .page-nav, .chapter-drawer, .page-outline, .candidate-note, .copy-code { display: none !important; }
  .doc-layout { display: block; }
  .doc-layout > main { padding: 0; border: 0; }
}

/* Keep promotional figures in the first screen; avoid duplicate brand headings. */
body[data-page=index] main > h1 {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.route-grid > p { display: contents; }
.showcase-overview { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; margin-block: 22px; }
.showcase-card { border: 1px solid var(--rule); border-top: 4px solid var(--coral); border-radius: 7px; padding: 8px; background: #fffcf5; }
.showcase-card:nth-child(2) { border-top-color: var(--accent); }
.showcase-card:nth-child(3) { border-top-color: var(--gold); }
.showcase-card a { display: block; text-decoration: none; }
.showcase-card img { width: 100%; height: 150px; object-fit: contain; }
.showcase-card strong { display: block; font-size: .85rem; text-align: center; color: #203d46; margin: 8px 0; }
@media(max-width:650px) {
  .showcase-overview { grid-template-columns: repeat(3,minmax(0,1fr)); gap: 7px; }
  .showcase-card { padding: 4px; }
  .showcase-card img { height: 100px; }
  .showcase-card strong { font-size: .75rem; }
}