/* Lucid exercises: numbered labels, copy-reference buttons, and scope notes.

   Labels
     <span class="exercise-label" data-exercise-id="E1.2">E1.2</span>
     <span class="question-group-label" data-question-group-id="Q3">Q3</span>
     <span data-copy-ref="2.4">2.4</span>          any other numbered label
   A label inside a heading receives a copy-reference button (js/copy-refs.js).

   Scope notes
     <details class="scope-note preview">   content that continues elsewhere
     <details class="scope-note optional">  optional extension material */

.exercise-label,
.question-label,
.question-group-label,
[data-copy-ref],
[data-page-id],
[data-section-id] {
  color: var(--bs-primary);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  white-space: nowrap;
}

.exercise-label,
.question-group-label,
[data-copy-ref],
[data-page-id],
[data-section-id] {
  scroll-margin-top: 5rem;
}

/* The label replaces the automatic section number in headings and the TOC. */
.exercise-heading > .header-section-number,
.question-group-heading > .header-section-number,
#TOC a:has(.question-group-label) > .header-section-number,
#TOC a:has(.exercise-label) > .header-section-number {
  display: none;
}

h3.exercise-heading,
h4.exercise-heading,
h5.exercise-heading {
  color: color-mix(in srgb, var(--lucid-text) 60%, var(--lucid-muted));
}

h3.exercise-heading {
  font-size: 1.25rem;
}

h4.exercise-heading {
  font-size: 1.1rem;
}

h5.exercise-heading {
  font-size: 1rem;
  font-style: normal;
}

.copy-ref-button {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 0.25rem;
  color: var(--bs-secondary-color);
  display: inline-flex;
  font-size: 0.72em;
  justify-content: center;
  margin-left: 0.35rem;
  opacity: 0.45;
  padding: 0.15rem 0.25rem;
  vertical-align: middle;
}

.copy-ref-button:hover,
.copy-ref-button:focus-visible,
.copy-ref-button.copied {
  background: color-mix(in srgb, var(--bs-primary) 10%, transparent);
  color: var(--bs-primary);
  opacity: 1;
}

.copy-ref-button:focus-visible {
  outline: 2px solid var(--bs-primary);
  outline-offset: 2px;
}

details.scope-note {
  border: 1px solid var(--lucid-line);
  border-radius: 0.4rem;
  margin: 1.25rem 0;
  padding: 0.75rem 1rem;
}

details.scope-note > summary {
  color: var(--lucid-muted);
  cursor: pointer;
  line-height: 1.4;
}

details.scope-note[open] > summary {
  border-bottom: 1px solid var(--lucid-line);
  margin-bottom: 0.9rem;
  padding-bottom: 0.65rem;
}

details.scope-note.preview {
  background: color-mix(in srgb, var(--bs-primary) 4%, transparent);
}

details.scope-note.optional {
  background: color-mix(in srgb, var(--lucid-muted) 6%, transparent);
}

/* "Solution [-@exr-id]" callouts are retitled by js/callouts.js. */
.callout[title^="Solution [-@"] .callout-title-container .quarto-xref {
  display: none;
}

@media print {
  .copy-ref-button {
    display: none !important;
  }

  details.scope-note {
    border: 0;
    padding: 0;
  }

  details.scope-note > summary {
    font-weight: 700;
  }
}