/*
 * TreeView
 *
 * Rows take Sidebar's rhythm — 32px minimum, 8px inset, `md` radius,
 * `surface/hover` and `surface/selected` fills — because a tree row and a
 * sidebar row are the same density of choice, and a tree often sits in the
 * same column a sidebar would.
 *
 *   indent    level x spacing/20, from `--ion-tree-view-level`, set per row
 *   toggle    24px square chevron button, rotated 90deg when open
 *   spacer    the same 24px on a leaf, so every label at a level lines up
 *   check     MultiSelect's drawn Small Checkbox, only in `multiple`
 *   icon      16px, icon/secondary; icon/primary on a selected row
 *
 * The block carries `surface/default` so the translucent hover has a ground
 * in this file — the contrast gate's rule, see sidebar.css.
 */
.ion-tree-view {
  --ion-tree-view-indent: var(--spacing-20);

  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  background-color: var(--surface-default);
  color: var(--text-secondary);
  font-family: var(--font-family-sans);
  font-size: var(--type-body-sm);
  line-height: var(--type-body-sm-line-height);
}

.ion-tree-view__row {
  --ion-tree-view-level: 0;

  /* A one-line row centres in its 32px; a row with a description grows. */
  display: flex;
  align-items: center;
  min-height: var(--spacing-32);
  padding-block: var(--spacing-4);
  padding-inline: calc(
      var(--spacing-4) + var(--ion-tree-view-level) *
        var(--ion-tree-view-indent)
    )
    var(--spacing-8);
  border-radius: var(--radius-md);
  cursor: default;
  outline: none;
  user-select: none;
}

.ion-tree-view__cell {
  display: flex;
  flex: 1;
  align-items: flex-start;
  gap: var(--spacing-4);
  min-width: 0;
}

.ion-tree-view__toggle,
.ion-tree-view__spacer {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: var(--spacing-24);
  height: var(--spacing-24);

  /* Centred on the label's first line. */
  margin-block: calc((var(--type-body-sm-line-height) - var(--spacing-24)) / 2);
}

.ion-tree-view__toggle {
  margin-inline: 0;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--icon-secondary);
  cursor: pointer;
}

.ion-tree-view__toggle svg {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
  transition: transform var(--ion-duration-base) var(--ion-ease-out);
}

.ion-tree-view__toggle--expanded svg {
  transform: rotate(90deg);
}

.ion-tree-view__check {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: var(--spacing-16);
  height: var(--spacing-16);
  margin-block-start: calc(
    (var(--type-body-sm-line-height) - var(--spacing-16)) / 2
  );
  margin-inline-end: var(--spacing-4);
  background-color: var(--surface-default);
  border: var(--border-width-thick) solid var(--border-stronger);
  border-radius: var(--radius-xs);
}

.ion-tree-view__check svg {
  width: calc(var(--spacing-16) / 2 + var(--spacing-4));
  height: calc(var(--spacing-16) / 2 + var(--spacing-4));
  opacity: 0;
}

.ion-tree-view__icon {
  display: inline-flex;
  flex: none;
  align-items: center;
  height: var(--type-body-sm-line-height);
  margin-inline-end: var(--spacing-4);
  color: var(--icon-secondary);
}

.ion-tree-view__icon svg {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
}

.ion-tree-view__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.ion-tree-view__label {
  overflow-wrap: anywhere;
}

.ion-tree-view__description {
  color: var(--text-tertiary);
  font-size: var(--type-caption);
  line-height: var(--type-caption-line-height);
}

/* ------------------------------------------------------------------ states */

@media (hover: hover) {
  .ion-tree-view__row:hover {
    background-color: var(--surface-hover);
    color: var(--text-default);
  }

  .ion-tree-view__toggle:hover {
    color: var(--icon-default);
  }
}

.ion-tree-view__row--selected {
  background-color: var(--surface-selected);
  color: var(--text-default);
  font-weight: var(--font-weight-medium);
}

.ion-tree-view__row--selected .ion-tree-view__icon {
  color: var(--icon-primary);
}

@media (hover: hover) {
  .ion-tree-view__row--selected:hover {
    background-color: var(--surface-selected-hover);
  }
}

.ion-tree-view__row--selected .ion-tree-view__check {
  color: var(--icon-on-color);
  background-color: var(--surface-primary);
  border-width: var(--border-width-default);
  border-color: var(--border-primary-strong);
  box-shadow: var(--ion-shadow-raised-flush-xs);
}

.ion-tree-view__row--selected .ion-tree-view__check svg {
  opacity: 1;
}

/* Two classes, so a disabled row does not react to hover — see sidebar.css. */
.ion-tree-view .ion-tree-view__row--disabled {
  background-color: var(--surface-default);
  color: var(--text-disabled);
  cursor: not-allowed;
}

.ion-tree-view .ion-tree-view__row--disabled .ion-tree-view__icon,
.ion-tree-view .ion-tree-view__row--disabled .ion-tree-view__toggle {
  color: var(--icon-disabled);
}

.ion-tree-view .ion-tree-view__row--disabled .ion-tree-view__check {
  background-color: var(--surface-disabled);
  border-color: var(--border-disabled);
  box-shadow: none;
}

.ion-tree-view__row[data-focus-visible='true'] {
  outline: var(--border-width-thick) solid var(--border-focus);
  outline-offset: calc(-1 * var(--border-width-thick));
}

/*
 * Closed, the chevron points the reading direction. Turned half round rather
 * than mirrored, so opening animates 180° to 90°, down, instead of flipping
 * through a squashed glyph.
 */
.ion-tree-view__toggle:dir(rtl):not(.ion-tree-view__toggle--expanded) svg {
  transform: rotate(180deg);
}

@media (forced-colors: active) {
  .ion-tree-view__row--selected {
    outline: var(--border-width-default) solid;
  }

  .ion-tree-view__row--selected .ion-tree-view__check {
    background-color: Highlight;
    color: HighlightText;
  }
}