/* styles/default/components/c-tree.css — #26 strom sekcí: c-tree (navigace, M8) a c-tree--editable (nastavení: drag & drop, přejmenování, přidání); smazané = c-fold, řádek číselníku = c-option (M9-11)
   Stavy: is-open · is-active · is-dragging · is-drop-before · is-drop-after · is-drop-into · is-drop-invalid · is-editing
   Created :: 2026-10-22
   Updated :: 2026-10-28
   2026-10-28 :: M9 – M9-11 (viz 04 kap. 3) */

.c-tree { list-style: none; margin: 0; padding: 0; }
.c-tree__item { position: relative; }

.c-tree__row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: var(--row-h-compact);
  padding: var(--sp-1) var(--sp-5) var(--sp-1) var(--sp-4);
  border-top: 1px solid var(--color-border);
  transition: background-color var(--dur-1) var(--ease-out);
}
.c-tree__row:hover, .c-tree__row:focus-within { background: var(--color-surface-hover); }
.c-tree__row:focus-visible { outline: none; box-shadow: inset var(--focus-ring); }

.c-tree__handle { display: inline-flex; align-items: center; color: var(--color-text-subtle); cursor: grab; touch-action: none; }
.c-tree__handle:hover { color: var(--color-text); }
.c-tree__item.is-dragging > .c-tree__row .c-tree__handle { cursor: grabbing; }
.c-tree__icon { color: var(--color-text-subtle); flex-shrink: 0; }

.c-tree__name {
  flex: 0 1 auto;
  min-width: 0;
  padding: var(--sp-half) .5rem;
  margin-left: -.5rem;
  border-radius: var(--r-sm);
  color: inherit;
  font-weight: var(--fw-medium);
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
button.c-tree__name:hover { background: var(--color-surface-2); }
button.c-tree__name:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.c-tree__input { flex: 1 1 auto; min-width: 8rem; max-width: 40rem; }
.c-tree__item.is-editing > .c-tree__row { background: var(--color-surface-hover); }

.c-tree__actions { display: flex; align-items: center; gap: var(--sp-1); margin-left: auto; opacity: 0; transition: opacity var(--dur-1) var(--ease-out); }
.c-tree__row:hover .c-tree__actions, .c-tree__row:focus-within .c-tree__actions, .c-tree__row:has([aria-expanded="true"]) .c-tree__actions { opacity: 1; }
@media (hover: none) { .c-tree__actions { opacity: 1; } }

/* Podsekce: odsazení s vodicí linkou */
.c-tree__children { position: relative; list-style: none; margin: 0; padding: 0 0 0 var(--sp-6); }
.c-tree__children::before { content: ""; position: absolute; left: calc(var(--sp-6) - 1px); top: 0; bottom: 0; border-left: 1px dashed var(--color-border); }
.c-tree__children .c-tree__row { padding-left: var(--sp-3); }

/* Drag & drop */
.c-tree__item.is-dragging { opacity: .45; }
.c-tree__item.is-drop-before > .c-tree__row { box-shadow: inset 0 var(--stroke-2) 0 var(--color-primary); }
.c-tree__item.is-drop-after > .c-tree__row { box-shadow: inset 0 calc(-1 * var(--stroke-2)) 0 var(--color-primary); }
.c-tree__item.is-drop-into > .c-tree__row { background: var(--color-primary-soft); box-shadow: inset 0 0 0 1px var(--color-primary); }
.c-tree__item.is-drop-invalid > .c-tree__row { background: var(--color-danger-soft); cursor: not-allowed; }

/* Navigační varianta (bez --editable, mobilní sheet sekcí): řádek je odkaz, počet vpravo, aktivní položka zvýrazněná */
a.c-tree__row { color: inherit; text-decoration: none; }
a.c-tree__row:hover { text-decoration: none; }
.c-tree__count { margin-left: auto; }   /* počet v navigačním stromu (proj_l2_sheet) */
.c-tree:not(.c-tree--editable) .c-tree__item.is-active > .c-tree__row { background: var(--color-surface-selected); }
.c-tree:not(.c-tree--editable) .c-tree__item.is-active > .c-tree__row .c-tree__name { color: var(--color-primary-text); }
.c-tree:not(.c-tree--editable) .c-tree__item:first-child > .c-tree__row { border-top: 0; }

/* Přidání sekce (nad stromem) a podsekce (inline v seznamu) */
.c-tree-add { border-bottom: 0; }
.c-tree-add__form { display: flex; align-items: flex-end; gap: var(--sp-3); }
.c-tree__add { padding: var(--sp-2) var(--sp-5) var(--sp-3) var(--sp-3); }
.c-tree-add__inline { display: flex; align-items: center; gap: var(--sp-2); }
.c-tree-add__input { flex: 1 1 auto; max-width: 40rem; }

@media (max-width: 767.98px) {
  .c-tree__row { min-height: var(--touch-min); padding: var(--sp-1) var(--sp-4) var(--sp-1) var(--sp-3); }
  .c-tree__children { padding-left: var(--sp-5); }
  .c-tree__children::before { left: calc(var(--sp-5) - 1px); }
  .c-tree__add-label { display: none; }   /* „Přidat podsekci“ jen ikona */
  .c-tree-add__form { flex-wrap: wrap; }
  .c-tree-add__field { flex: 1 1 100%; }
}