/* ==========================================================================
   SOURCE: form-builder-drag-drop.css
   ========================================================================== */
/* ============================================================
   FORM BUILDER -DRAG + DROP
   Add after form-builder.css and form-sections-flow.css.
   ============================================================ */

/* Palette items are still buttons, so clicking remains supported. */

.builder-field-button[draggable="true"] {
  cursor: grab;
}

.builder-field-button[draggable="true"]:active {
  cursor: grabbing;
}

/* Existing fields can be dragged to reorder them. */

.builder-canvas-fields article[draggable="true"] {
  cursor: grab;
}

.builder-canvas-fields article[draggable="true"]:active {
  cursor: grabbing;
}

/* ------------------------------------------------------------
   INSERTION DROP ZONES

   Normally nearly invisible so the canvas does not become noisy.
   During a drag they expand into clear insertion targets.
   ------------------------------------------------------------ */

.builder-drop-zone {
  position: relative;

  height: 6px;
  min-height: 14px;

  display: grid;
  place-items: center;

  margin: 2px 6px;

  border-radius: 7px;

  transition:
    height var(--if-transition-fast),
    margin var(--if-transition-fast),
    background var(--if-transition-fast),
    border-color var(--if-transition-fast);
}

.builder-drop-zone > span {
  opacity: 0;

  color: var(--if-secondary);

  font-size: 0.875rem;
  font-weight: 800;

  letter-spacing: 0.04em;

  text-transform: uppercase;

  pointer-events: none;

  transition: opacity var(--if-transition-fast);
}

.builder-drop-zone-active {
  height: 24px;
  min-height: 30px;

  margin-top: 4px;
  margin-bottom: 4px;

  border: 1px dashed color-mix(in srgb, var(--if-secondary), transparent 55%);

  background: color-mix(in srgb, var(--if-secondary), transparent 96%);
}

.builder-drop-zone-active > span {
  opacity: 0.62;
}

.builder-drop-zone-hover {
  height: 36px;

  border-color: var(--if-secondary);

  background: var(--if-secondary-soft);

  box-shadow: inset 0 0 0 1px
    color-mix(in srgb, var(--if-secondary), transparent 60%);
}

.builder-drop-zone-hover::before {
  content: "";

  position: absolute;

  left: 12px;
  right: 12px;
  top: 50%;

  height: 2px;

  background: var(--if-secondary);

  transform: translateY(-50%);

  pointer-events: none;
}

.builder-drop-zone-hover::after {
  content: "+";

  position: absolute;

  top: 50%;
  left: 50%;

  width: 22px;
  height: 22px;

  display: grid;
  place-items: center;

  border-radius: 999px;

  background: var(--if-secondary);
  color: var(--if-surface);

  font-size: 0.8rem;
  font-weight: 800;

  transform: translate(-50%, -50%);

  pointer-events: none;
}

.builder-drop-zone-hover > span {
  opacity: 0;
}

/* ------------------------------------------------------------
   EMPTY CANVAS DROP TARGET
   ------------------------------------------------------------ */

.builder-empty-drop-label {
  display: none;

  margin-top: 9px;

  color: var(--if-secondary);

  font-size: 0.875rem;
  font-weight: 800;

  letter-spacing: 0.04em;

  text-transform: uppercase;
}

.builder-empty-form-dragging {
  border-color: color-mix(in srgb, var(--if-secondary), transparent 35%);

  background: color-mix(in srgb, var(--if-secondary), transparent 96%);
}

.builder-empty-form-dragging .builder-empty-drop-label {
  display: block;
}

.builder-empty-form-drop-hover {
  border-color: var(--if-secondary);

  background: var(--if-secondary-soft);

  box-shadow: inset 0 0 0 1px
    color-mix(in srgb, var(--if-secondary), transparent 55%);
}

/* ------------------------------------------------------------
   DRAG AFFORDANCE

   Keep the existing toolbar buttons because they provide a
   keyboard/touch-friendly alternative to dragging.
   ------------------------------------------------------------ */

/* Drag handle is rendered explicitly in FormBuilder.razor.
   Disable the legacy pseudo-element so no mojibake symbol appears. */
.builder-canvas-field-toolbar::before {
  content: none;
  display: none;
}

/* Touch devices keep the click/move-button workflow. */

@media (hover: none), (pointer: coarse) {
  .builder-field-button[draggable="true"],
  .builder-canvas-fields article[draggable="true"] {
    cursor: default;
  }

  .builder-drop-zone {
    display: none;
  }
}

/* ============================================================
   DRAG + DROP -PRECISION / USABILITY FIX
   ============================================================ */

/*
 * While dragging, the field itself is also a valid target.
 * Dropping directly on a field inserts immediately before it.
 */

.builder-canvas-field[draggable="true"] {
  transition:
    border-color var(--if-transition-fast),
    box-shadow var(--if-transition-fast),
    opacity var(--if-transition-fast);
}

.builder-canvas-field[draggable="true"]:hover {
  border-color: color-mix(in srgb, var(--if-secondary), var(--if-border) 45%);
}

/* ============================================================
   FORM BUILDER -UNDO / REDO
   ============================================================ */

.builder-history-actions {
  display: inline-flex;
  align-items: center;

  gap: 4px;

  padding-right: 8px;
  margin-right: 4px;

  border-right: 1px solid var(--if-border);
}

.builder-history-button {
  min-width: 68px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  gap: 5px;
}

.builder-history-button > span {
  font-size: 0.875rem;
  line-height: 1;
}

.builder-history-button:disabled {
  opacity: 0.42;
}

@media (max-width: 900px) {
  .builder-history-actions {
    padding-right: 0;
    margin-right: 0;

    border-right: 0;
  }

  .builder-history-button {
    min-width: 36px;
    font-size: 0;
  }

  .builder-history-button > span {
    font-size: 0.875rem;
  }
}