/* Published ladder geometry stays fixed; only its labels move into this legend. */
.article-structure-chart {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  margin: 1.4rem 0;
}
.article-structure-chart .structure-chart-scroll {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}
.article-structure-chart .article-structure-svg {
  display: block;
  width: 100% !important;
  min-width: 560px;
  max-width: none !important;
  height: auto !important;
  overflow: visible;
}
.article-structure-chart .structure-chart-number {
  font-size: 12px;
  font-weight: 700;
}
.article-structure-chart .structure-chart-caption {
  margin-top: .65rem;
  color: var(--fg);
  text-align: left;
}
.article-structure-chart .structure-chart-guide,
.article-structure-chart .structure-chart-note {
  margin: .7rem 0;
  color: var(--mut);
  font-size: .9rem;
  line-height: 1.75;
  overflow-wrap: anywhere;
}
.article-structure-chart .structure-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem 1.2rem;
  list-style: none;
  padding: 0;
  margin: .65rem 0;
}
.article-structure-chart .structure-chart-legend li {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  min-width: 0;
  max-width: 100%;
  margin: 0;
  overflow-wrap: anywhere;
}
.article-structure-chart .structure-chart-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-width: 1.6em;
  height: 1.6em;
  padding: 0 .2em;
  border: 1px solid var(--line);
  border-radius: .35rem;
  font-size: .85em;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
@media (max-width: 600px) {
  .article-structure-chart .structure-chart-legend { gap: .6rem 1rem; }
  .article-structure-chart .structure-chart-legend li { flex-basis: calc(50% - .5rem); }
}