.tree {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  min-width: fit-content;
  position: relative; /* For absolute positioning of drop indicator */
}

.tree.drag-disabled .drag-handle {
  visibility: hidden;
  pointer-events: none;
}

.tree.tree-deadline-mode,
.tree.tree-inbox-mode,
.tree.tree-reminder-mode {
  min-width: 0;
  width: 100%;
}

/* Deadline mode section dividers */
.deadline-section-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0 2px;
  max-width: 400px;
  user-select: none;
  pointer-events: none;
}

.deadline-section-divider-line {
  flex: 1;
  height: 1px;
  background: var(--accent-primary);
}

.deadline-section-divider-text {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* Free-sort group dividers */
.free-sort-group-divider {
  display: flex;
  align-items: center;
  padding: 2px 0;
  user-select: none;
  pointer-events: none;
}

.free-sort-group-divider-line {
  flex: 1;
  height: 1px;
  background: var(--border-color);
  opacity: 0.25;
}

/* Reminder mode */
.reminder-mode-toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 0 0 24px;
  margin-bottom: -13px;
}

.reminder-mode-select-all {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.reminder-mode-select-all:hover {
  color: var(--text-primary);
}

.reminder-mode-snooze-btn {
  padding: 4px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.reminder-mode-snooze-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.reminder-mode-snooze-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.reminder-mode-row {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  overflow: hidden;
}

.reminder-mode-checkbox {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin: 0;
  vertical-align: middle;
  cursor: pointer;
  flex-shrink: 0;
  border: 2px solid #888;
  border-radius: 3px;
  background: transparent;
  position: relative;
}

.reminder-mode-checkbox:checked {
  background: #4f8cff;
  border-color: #4f8cff;
}

.reminder-mode-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 0px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.reminder-mode-select-all span {
  line-height: 16px;
  transform: translateY(-1px);
}

.reminder-mode-row > .tree-node,
.reminder-mode-row > .tree-node-row {
  flex: 1;
  min-width: 0;
}

/* Inbox mode */
.inbox-mode-toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 4px 14px;
  margin-bottom: -13px;
}

.inbox-mode-select-all {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.inbox-mode-select-all:hover {
  color: var(--text-primary);
}

.inbox-mode-select-all span {
  line-height: 16px;
  transform: translateY(-1px);
}

.inbox-mode-row {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  overflow: hidden;
}

.inbox-mode-checkbox {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin: 0;
  vertical-align: middle;
  cursor: pointer;
  flex-shrink: 0;
  border: 2px solid #888;
  border-radius: 3px;
  background: transparent;
  position: relative;
}

.inbox-mode-checkbox:checked {
  background: #4f8cff;
  border-color: #4f8cff;
}

.inbox-mode-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 0px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.inbox-mode-row > .tree-node,
.inbox-mode-row > .tree-node-row {
  flex: 1;
  min-width: 0;
}

@media (max-width: 768px) {
  .reminder-mode-checkbox,
  .inbox-mode-checkbox {
    width: 24px;
    height: 24px;
  }
  .reminder-mode-checkbox:checked::after,
  .inbox-mode-checkbox:checked::after {
    left: 5px;
    top: 1px;
    width: 7px;
    height: 13px;
  }
}