:root {
  color-scheme: light dark;
  --fg: #1b1f23;
  --bg: #ffffff;
  --muted: #57606a;
  --border: #d0d7de;
  --code-bg: #f6f8fa;
  --accent: #0969da;
  --accent-contrast: #ffffff;
  --ok-bg: #dafbe1;
  --err-bg: #ffebe9;
  --err-fg: #82071e;
  --syn-keyword: #cf222e;
  --syn-string: #0a3069;
  --syn-function: #8250df;
  --syn-number: #005cc5;
  --syn-variable: #953800;
  --comunica-fg: #9c0510;
  --comunica-bg: #fdeceb;
  --wikidata-fg: #0b7285;
  --orcid-fg: #5a7d1a;
  --note-bg: #ddf4ff;
  max-width: 100%;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --bg: #0d1117;
    --muted: #8b949e;
    --border: #30363d;
    --code-bg: #161b22;
    --accent: #4493f8;
    --accent-contrast: #0d1117;
    --ok-bg: #12261e;
    --err-bg: #2d1214;
    --err-fg: #ff8182;
    --comunica-fg: #ff8b93;
    --comunica-bg: #2d1214;
    --wikidata-fg: #39c5cf;
    --orcid-fg: #a6ce39;
    --note-bg: #122b42;
    --syn-keyword: #ff7b72;
    --syn-string: #a5d6ff;
    --syn-function: #d2a8ff;
    --syn-number: #79c0ff;
    --syn-variable: #ffa657;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1rem clamp(16px, 4vw, 2rem);
}

.site-header .brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
  font-size: 1.05rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  margin-top: 0.5rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-nav a:hover, .site-nav a.active {
  color: var(--accent);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown summary {
  list-style: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-dropdown summary::-webkit-details-marker {
  display: none;
}

.nav-dropdown summary::marker {
  content: '';
}

.nav-dropdown summary::after {
  content: '\25BE';
  font-size: 0.7em;
  position: relative;
  top: 1px;
}

.nav-dropdown summary:hover,
.nav-dropdown summary.active,
.nav-dropdown[open] summary {
  color: var(--accent);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  min-width: 190px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.35rem;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
  z-index: 30;
}

.nav-dropdown-menu a {
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
  white-space: nowrap;
}

.nav-dropdown-menu a:hover {
  background: var(--code-bg);
}

.nav-dropdown-menu a.active {
  color: var(--accent);
  font-weight: 600;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.5rem clamp(16px, 4vw, 2rem) 4rem;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 860px) 220px;
  gap: 2.5rem;
  justify-content: center;
  align-items: start;
}

.page-layout:not(:has(.page-toc)) {
  grid-template-columns: minmax(0, 860px);
}

.page-content {
  min-width: 0;
}

.page-toc {
  position: sticky;
  top: 1.25rem;
  align-self: start;
  font-size: 0.85rem;
  max-height: calc(100vh - 2.5rem);
  overflow-y: auto;
}

.page-toc-title {
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

.page-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--border);
}

.page-toc li {
  margin: 0;
}

.page-toc a {
  display: block;
  padding: 0.25rem 0 0.25rem 0.75rem;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.35;
}

.page-toc a:hover {
  color: var(--accent);
  border-left-color: var(--border);
}

.page-toc-h3 a {
  padding-left: 1.5rem;
  font-size: 0.92em;
}

@media (max-width: 1000px) {
  main {
    max-width: 860px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-toc {
    position: static;
    order: -1;
    max-height: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
  }
}

.notebook-download {
  margin: 0 0 0.5rem;
  text-align: right;
}

.notebook-download a {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.notebook-download a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

h1, h2, h3, h4 { line-height: 1.25; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.4rem; margin-top: 2.2rem; border-top: 1px solid var(--border); padding-top: 1.5rem; }
h3 { font-size: 1.15rem; margin-top: 1.6rem; }

a { color: var(--accent); }

code {
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}

pre code { background: none; padding: 0; }

.token.comment { color: var(--muted); font-style: italic; }
.token.string,
.token.multiline-string,
.token.url { color: var(--syn-string); }
.token.keyword,
.token.tag { color: var(--syn-keyword); font-weight: 600; }
.token.function { color: var(--syn-function); }
.token.number,
.token.boolean { color: var(--syn-number); }
.token.variable { color: var(--syn-variable); }
.token.punctuation { color: var(--muted); }

table {
  border-collapse: collapse;
  width: 100%;
  overflow-x: auto;
  display: block;
  margin: 0.75rem 0;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  text-align: left;
  font-size: 0.92rem;
}

th { background: var(--code-bg); }

.sparql-fixture {
  margin: 1rem 0 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.sparql-fixture summary {
  cursor: pointer;
  padding: 0.5rem 0.9rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.sparql-editable-hint {
  font-style: italic;
}

.sparql-fixture pre {
  margin: 0;
  border: none;
  border-top: 1px solid var(--border);
  border-radius: 0;
}

.sparql-example {
  margin: 0.5rem 0 1.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.sparql-example .sparql-query {
  margin: 0;
  border: none;
  border-radius: 0;
}

[contenteditable="true"] {
  outline: none;
  cursor: text;
}

[contenteditable="true"]:hover {
  box-shadow: inset 0 0 0 1px var(--accent);
}

[contenteditable="true"]:focus {
  box-shadow: inset 0 0 0 2px var(--accent);
  background: var(--bg);
}

.sparql-example-toolbar,
.sparql-fixture-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  background: var(--code-bg);
  border-top: 1px solid var(--border);
}

.sparql-fixture-toolbar {
  border-radius: 0 0 6px 6px;
}

.sparql-btn {
  border: none;
  border-radius: 5px;
  padding: 0.4rem 0.9rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.sparql-run,
.sparql-graph-toggle {
  background: var(--accent);
  color: var(--accent-contrast);
}

.sparql-btn:disabled { opacity: 0.6; cursor: progress; }
.sparql-btn:hover:not(:disabled) { filter: brightness(1.08); }

.sparql-btn-secondary {
  background: transparent;
  color: var(--muted);
  box-shadow: inset 0 0 0 1px var(--border);
}

.sparql-reference-note {
  font-size: 0.85rem;
  color: var(--muted);
}

.sparql-results {
  padding: 0 0.9rem;
}

.sparql-results:empty { padding: 0; }

.sparql-empty {
  color: var(--muted);
  font-style: italic;
  padding: 0.75rem 0;
}

.sparql-ask-result {
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.75rem 0;
}

.sparql-error {
  background: var(--err-bg);
  color: var(--err-fg);
  border: none;
  border-radius: 4px;
  margin: 0.75rem 0;
  white-space: pre-wrap;
}

.sparql-graph {
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.sparql-graph:empty {
  border-top: none;
}

.sparql-graph-svg {
  display: block;
  touch-action: none;
  cursor: grab;
}

.sparql-graph-svg:active {
  cursor: grabbing;
}

.sparql-graph-links line {
  stroke: var(--muted);
  stroke-opacity: 0.6;
  stroke-width: 1.5px;

  &.sparql-graph-link-predicate {
    stroke-dasharray: 2 3;
    stroke-opacity: 0.45;
    stroke-width: 1px;
  }

  &.sparql-graph-link-source-wikidata {
    stroke: var(--wikidata-fg);
    stroke-opacity: 0.8;
  }

  &.sparql-graph-link-source-orcid {
    stroke: var(--orcid-fg);
    stroke-opacity: 0.8;
  }
}

.sparql-graph-link-labels text {
  fill: var(--muted);
  font-size: 10px;
  text-anchor: middle;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 3px;

  &.sparql-graph-link-source-wikidata {
    fill: var(--wikidata-fg);
  }

  &.sparql-graph-link-source-orcid {
    fill: var(--orcid-fg);
  }
}

.sparql-graph-nodes circle {
  stroke: var(--bg);
  stroke-width: 1.5px;
}

.sparql-graph-nodes text {
  fill: var(--fg);
  font-size: 11px;
  font-weight: 600;
  text-anchor: middle;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 3px;
}

.sparql-graph-nodes g {
  cursor: grab;
}

.sparql-graph-node-literal {
  rect {
    fill: var(--code-bg);
    stroke: var(--muted);
    stroke-width: 1.5px;
  }

  text {
    fill: var(--fg);
    font-size: 11px;
    font-weight: 400;
    font-style: italic;
    text-anchor: middle;
    paint-order: stroke;
    stroke: none;
  }
}

.sparql-graph-node-source-wikidata {
  circle {
    fill: var(--wikidata-fg);
  }

  rect {
    stroke: var(--wikidata-fg);
    stroke-width: 2px;
  }
}

.sparql-graph-node-source-orcid {
  circle {
    fill: var(--orcid-fg);
  }

  rect {
    stroke: var(--orcid-fg);
    stroke-width: 2px;
  }
}

.sparql-graph-empty {
  color: var(--muted);
  font-style: italic;
  padding: 0.9rem;
  margin: 0;
}

.sparql-shacl-graph-svg .sparql-shacl-edge-extends {
  stroke: var(--accent);
  stroke-opacity: 0.7;
  stroke-width: 1.5px;
  stroke-dasharray: 4 3;
}

.sparql-shacl-graph-svg .sparql-shacl-edge-property {
  stroke: var(--muted);
  stroke-opacity: 0.6;
  stroke-width: 1.5px;
}

.sparql-shacl-node-shape rect {
  fill: var(--code-bg);
  stroke: var(--accent);
  stroke-width: 1.5px;
}

.sparql-shacl-node-shape text {
  fill: var(--fg);
  font-size: 11px;
  font-weight: 600;
}

.sparql-shacl-node-class circle {
  fill: #3fb950;
  stroke: var(--bg);
  stroke-width: 1.5px;
}

.sparql-shacl-node-datatype circle {
  fill: #d29922;
  stroke: var(--bg);
  stroke-width: 1.5px;
}

.sparql-shacl-node-class text,
.sparql-shacl-node-datatype text {
  fill: var(--fg);
  font-size: 11px;
  font-weight: 600;
  text-anchor: middle;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 3px;
}

.sparql-shacl-node rect,
.sparql-shacl-node circle {
  cursor: grab;
}

.reference-block {
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin: 1rem 0 1.75rem;
}

.sparql-live-fetch {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin: 1rem 0 1.75rem;

  .sparql-live-fetch-legend {
    margin: 0;
    font-size: 0.8rem;
    color: var(--muted);
  }

  .sparql-live-fetch-swatch {
    display: inline-block;
    width: 0.7em;
    height: 0.7em;
    border-radius: 50%;
    margin: 0 0.3em 0 0.9em;
    vertical-align: middle;

    &.sparql-live-fetch-swatch-wikidata {
      background: var(--wikidata-fg);
      margin-left: 0;
    }

    &.sparql-live-fetch-swatch-orcid {
      background: var(--orcid-fg);
    }
  }

  .sparql-live-fetch-status {
    margin: 0;
    font-size: 0.85rem;
    color: var(--muted);

    &.is-error {
      color: var(--err-fg);
    }
  }
}

.comunica-note {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  border: 1px solid var(--comunica-fg);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin: 1rem 0 1.75rem;
  background: var(--comunica-bg);

  .comunica-icon {
    flex: none;
    width: 26px;
    height: 26px;
    margin-top: 0.15rem;
    fill: var(--comunica-fg);
  }

  .comunica-note-body {
    min-width: 0;
  }

  .comunica-note-label {
    margin: 0 0 0.35rem;
    color: var(--comunica-fg);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }
}

/* The one consistent way this site marks up a short side-remark -- a "Note",
   "One honest caveat", "Worth remembering", whatever a page's prose used to
   call it ad hoc -- so every aside looks the same everywhere instead of each
   page inventing its own unstyled lead-in phrase. Reuses --accent rather
   than a dedicated color pair: a plain informational note doesn't need its
   own hue the way a branded Comunica-limitation callout does. */
.sparql-note {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  border: 1px solid var(--accent);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin: 1rem 0 1.75rem;
  background: var(--note-bg);

  .sparql-note-icon {
    flex: none;
    width: 22px;
    height: 22px;
    margin-top: 0.15rem;
    color: var(--accent);
  }

  .sparql-note-body {
    min-width: 0;
  }

  .sparql-note-label {
    margin: 0 0 0.35rem;
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }
}

.reference-block .reference-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1.5rem clamp(16px, 4vw, 2rem) 3rem;
  text-align: center;
}