/* Collapsible sections (static/collapsible.js, collapsible_toggle macro).
   The whole header is a click target; the chevron button is the keyboard and
   screen-reader control. The body is hidden with the attribute and
   `is-collapsed` styles the header, so nothing animates layout; only the
   chevron turns (a transform), and not at all under reduced motion. */
[data-collapsible] {
  scroll-margin-top: calc(var(--t-topbar-h, 61px) + 16px);
}
[data-collapsible-head]:has([data-collapsible-toggle]) {
  cursor: pointer;
}
[data-collapsible-body][hidden] {
  display: none !important;
}

button.dx-collapse-toggle {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: var(--t-radius-sm, 8px);
  background: transparent;
  color: var(--t-fg-soft);
  font-size: 16px;
  box-shadow: none;
  cursor: pointer;
  transition:
    background var(--t-trans-fast, 120ms),
    color var(--t-trans-fast, 120ms);
}
.dx-collapse-toggle .ph {
  transition: transform 160ms ease;
}
/* The global button rules (forms.css) lift, shadow and outline every button:
   this one stays flat. */
[data-collapsible-head]:hover button.dx-collapse-toggle,
button.dx-collapse-toggle:hover {
  background: var(--t-surface-soft);
  border-color: transparent;
  box-shadow: none;
  transform: none;
  color: var(--t-fg);
}
button.dx-collapse-toggle:active {
  transform: none;
  box-shadow: none;
}
button.dx-collapse-toggle:focus-visible {
  outline: 2px solid var(--t-accent);
  outline-offset: 2px;
  box-shadow: none;
}
.is-collapsed [data-collapsible-head] .dx-collapse-toggle .ph {
  transform: rotate(-90deg);
}
/* A collapsed section is just its header: no rule or gap under it. */
.dx-section-card.is-collapsed .dx-section-head {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom-width: 0;
}
/* ``card_head`` cards (the .card chrome): the chevron sits last in the action
   slot, and a collapsed card is just its header. */
.card-head-action:has(.dx-collapse-toggle) {
  display: flex;
  align-items: center;
  gap: var(--t-space-2, 8px);
}
.is-collapsed > .card-head {
  margin-bottom: 0;
}
@media (max-width: 540px) {
  button.dx-collapse-toggle {
    width: 36px;
    height: 36px;
  }
}
@media (prefers-reduced-motion: reduce) {
  button.dx-collapse-toggle,
  .dx-collapse-toggle .ph {
    transition: none;
  }
}
@media print {
  button.dx-collapse-toggle {
    display: none;
  }
}