.about-boundaries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.about-boundaries div {
  border-top: 1px solid var(--border);
  padding-top: .8rem;
}

.about-boundaries dt {
  font-weight: 700;
}

.about-boundaries dd {
  margin: .35rem 0 0;
  color: var(--text-soft);
}

.about-route-note {
  margin-top: 1rem;
  padding: .85rem 1rem;
  border-left: 2px solid var(--accent);
  background: var(--surface-2);
}

.about-disclosure {
  margin: 1rem 0 0;
  border: 1px solid var(--border);
  border-radius: .75rem;
  background: var(--surface-2);
  overflow: clip;
}

.about-disclosure > summary {
  cursor: pointer;
  padding: 1rem 1.1rem;
  font-weight: 700;
  list-style-position: inside;
}

.about-disclosure > summary span {
  display: block;
  margin-top: .25rem;
  color: var(--text-soft);
  font-size: .92rem;
  font-weight: 400;
}

.about-disclosure-body {
  padding: 0 1.1rem 1.1rem;
}

.about-disclosure-body > * + * {
  margin-top: .8rem;
}

.about-history {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

.about-history-entry {
  border-left: 2px solid var(--accent);
  padding: .9rem 1rem;
  background: var(--surface-2);
}

.about-history-entry time {
  display: block;
  margin-bottom: .35rem;
  color: var(--accent);
  font-size: var(--text-sm);
  font-weight: 700;
}

.about-history-entry h3 {
  margin: 0;
}

.about-history-entry p {
  margin-top: .55rem;
  color: var(--text-soft);
}

@media (max-width: 640px) {
  .about-boundaries {
    grid-template-columns: 1fr;
  }
}