.gantt {
  --gantt-sidebar-width: 340px;
  --gantt-row-height: 44px;
  --gantt-day-width: 32px;
  --gantt-header-month-height: 26px;
  --gantt-header-day-height: 34px;
  --gantt-header-height: calc(var(--gantt-header-month-height) + var(--gantt-header-day-height));
  --gantt-toolbar-height: 48px;
  --gantt-border: var(--border-color, #e2e8f0);
  --gantt-grid-line: #e5e7eb;
  --gantt-accent: var(--accent-color, #1e3a8a);
  --gantt-accent-hover: var(--accent-hover, #1d4ed8);
  --gantt-accent-soft: color-mix(in srgb, var(--gantt-accent) 8%, white);
  --gantt-accent-muted: color-mix(in srgb, var(--gantt-accent) 14%, white);
  --gantt-bar-super-category: #334155;
  --gantt-bar-category: #64748b;
  --gantt-bar-activity: var(--gantt-accent);
  --gantt-bar-activity-progress: var(--gantt-accent-hover);
  --gantt-row-hover: #f8fafc;
  --gantt-row-super: #f1f5f9;
  --gantt-row-category: #f8fafc;
  --gantt-today-line: var(--gantt-accent);
  --gantt-today-bg: color-mix(in srgb, var(--gantt-accent) 6%, white);
  --gantt-weekend-bg: #fafafa;
  --gantt-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.04);
}

.gantt,
.gantt *,
.gantt *::before,
.gantt *::after {
  box-sizing: border-box;
}

.gantt__layout {
  display: flex;
  border: 1px solid var(--gantt-border);
  border-radius: 0.75rem;
  background: #fff;
  overflow: hidden;
  min-height: 480px;
  box-shadow: var(--gantt-shadow);
}

.gantt__sidebar {
  width: var(--gantt-sidebar-width);
  flex-shrink: 0;
  border-right: 1px solid var(--gantt-border);
  display: flex;
  flex-direction: column;
  background: var(--sidebar-bg, #f8fafc);
}

.gantt__sidebar-header {
  height: calc(var(--gantt-toolbar-height) + var(--gantt-header-height));
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--gantt-border);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.875rem;
  flex-shrink: 0;
  background: #fff;
}

.gantt__sidebar-title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #64748b;
}

.gantt__sidebar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.gantt__sidebar-body {
  overflow-y: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: #cbd5e1 transparent;
}

.gantt__chart-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: #fff;
}

.gantt__toolbar {
  height: var(--gantt-toolbar-height);
  border-bottom: 1px solid var(--gantt-border);
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0 1rem;
  flex-shrink: 0;
  background: #fff;
}

.gantt__toolbar-group {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 0.125rem;
  border: 1px solid var(--gantt-border);
  border-radius: 0.5rem;
  background: #f8fafc;
}

.gantt__toolbar-btn {
  border: none;
  background: transparent;
  color: #475569;
  border-radius: 0.375rem;
  padding: 0.3125rem 0.625rem;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.25rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.gantt__toolbar-btn:hover {
  background: #fff;
  color: var(--gantt-accent);
}

.gantt__toolbar-btn--label {
  cursor: default;
  min-width: 3rem;
  text-align: center;
  color: #64748b;
}

.gantt__toolbar-btn--label:hover {
  background: transparent;
  color: #64748b;
}

.gantt__toolbar-btn[data-gantt-today] {
  border: 1px solid var(--gantt-border);
  border-radius: 0.5rem;
  background: #fff;
  padding: 0.3125rem 0.75rem;
}

.gantt__toolbar-btn[data-gantt-today]:hover {
  border-color: var(--gantt-accent-muted);
  background: var(--gantt-accent-soft);
  color: var(--gantt-accent);
}

.gantt__toolbar-select {
  border: 1px solid var(--gantt-border);
  border-radius: 0.5rem;
  padding: 0.3125rem 0.625rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: #475569;
  background: #fff;
  cursor: pointer;
}

.gantt__toolbar-select:focus {
  border-color: var(--gantt-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--gantt-accent) 12%, transparent);
}

.gantt__toolbar-hint {
  margin-left: auto;
  font-size: 0.75rem;
  color: #94a3b8;
}

.gantt__viewport {
  overflow: auto;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: #cbd5e1 transparent;
}

.gantt__canvas {
  position: relative;
  min-width: 100%;
}

.gantt__header {
  position: sticky;
  top: 0;
  z-index: 2;
  height: var(--gantt-header-height);
  border-bottom: 1px solid var(--gantt-border);
  background: #fff;
  display: flex;
  flex-direction: column;
}

.gantt__header-months {
  display: flex;
  height: var(--gantt-header-month-height);
  flex-shrink: 0;
  border-bottom: 1px solid var(--gantt-border);
  background: #f8fafc;
}

.gantt__header-month {
  flex-shrink: 0;
  width: calc(var(--gantt-day-width) * var(--gantt-month-span));
  padding: 0 0.625rem;
  display: flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: #475569;
  text-transform: capitalize;
  border-right: 1px solid var(--gantt-grid-line);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.gantt__header-days {
  display: flex;
  height: var(--gantt-header-day-height);
  flex-shrink: 0;
}

.gantt__header-day {
  position: relative;
  flex-shrink: 0;
  width: var(--gantt-day-width);
  border-right: 1px solid var(--gantt-grid-line);
  text-align: center;
  font-size: 0.6875rem;
  color: #94a3b8;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1875rem;
  text-transform: lowercase;
}

.gantt__header-day-number {
  font-weight: 600;
  font-size: 0.8125rem;
  color: #475569;
}

.gantt__header-day--weekend {
  background: var(--gantt-weekend-bg);
}

.gantt__header-day--weekend .gantt__header-day-number {
  color: #94a3b8;
}

.gantt__header-day--today {
  background: var(--gantt-today-bg);
}

.gantt__header-day--today .gantt__header-day-number {
  color: var(--gantt-accent);
  font-weight: 700;
}

.gantt__header-day--today::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1.25rem;
  height: 2px;
  border-radius: 1px;
  background: var(--gantt-today-line);
}

.gantt__rows {
  position: relative;
}

/* Shared fixed row height — sidebar and chart must stay pixel-perfect aligned */
.gantt__sidebar-row,
.gantt__rows > .gantt__row {
  height: var(--gantt-row-height);
  min-height: var(--gantt-row-height);
  max-height: var(--gantt-row-height);
  flex-shrink: 0;
  border-bottom: 1px solid var(--gantt-border);
  overflow: hidden;
}

.gantt__row {
  display: block;
}

.gantt__row--hidden {
  display: none;
}

.gantt__row--super-category {
  background: var(--gantt-row-super);
}

.gantt__row--category {
  background: var(--gantt-row-category);
}

.gantt__chart-cell {
  position: relative;
  width: 100%;
  height: 100%;
}

.gantt__chart-cell-inner {
  position: relative;
  height: 100%;
}

.gantt__grid-lines {
  position: absolute;
  inset: 0;
  display: flex;
  pointer-events: none;
}

.gantt__grid-line {
  flex-shrink: 0;
  width: var(--gantt-day-width);
  border-right: 1px solid var(--gantt-grid-line);
  height: 100%;
}

.gantt__grid-line--weekend {
  background: var(--gantt-weekend-bg);
}

.gantt__grid-line--today {
  background: var(--gantt-today-bg);
  box-shadow: inset 2px 0 0 var(--gantt-today-line);
}

.gantt__bar {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  height: 24px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 500;
  white-space: nowrap;
  text-overflow: ellipsis;
  padding: 0 0.625rem;
  box-sizing: border-box;
  z-index: 1;
  transition: filter 0.15s ease;
}

.gantt__bar:hover {
  filter: brightness(1.06);
}

.gantt__bar--super-category {
  background: var(--gantt-bar-super-category);
  height: 20px;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.gantt__bar--category {
  background: var(--gantt-bar-category);
  height: 18px;
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.gantt__bar--activity {
  background: var(--gantt-bar-activity);
  cursor: grab;
  touch-action: none;
  user-select: none;
}

.gantt__bar--activity.gantt__bar--interacting {
  cursor: grabbing;
  filter: none;
  z-index: 3;
}

.gantt__bar--super-category.gantt__bar--interacting,
.gantt__bar--category.gantt__bar--interacting {
  cursor: grabbing;
  filter: none;
  z-index: 3;
}

.gantt__bar-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 10px;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.12s ease;
}

.gantt__bar--activity:hover .gantt__bar-handle,
.gantt__bar--activity.gantt__bar--interacting .gantt__bar-handle {
  opacity: 1;
}

.gantt__bar-handle--start {
  left: 0;
  cursor: col-resize;
  border-radius: 4px 0 0 4px;
  background: color-mix(in srgb, #fff 22%, transparent);
}

.gantt__bar-handle--end {
  right: 0;
  cursor: col-resize;
  border-radius: 0 4px 4px 0;
  background: color-mix(in srgb, #fff 22%, transparent);
}

.gantt__bar-progress {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  background: var(--gantt-bar-activity-progress);
  border-radius: 4px 0 0 4px;
  pointer-events: none;
}

.gantt__bar-label {
  position: relative;
  z-index: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.gantt__bar-percent {
  position: relative;
  z-index: 1;
  margin-left: auto;
  font-size: 0.625rem;
  font-weight: 600;
  background: color-mix(in srgb, #000 18%, transparent);
  border-radius: 3px;
  padding: 0.0625rem 0.3125rem;
}

.gantt__toggle {
  border: none;
  background: transparent;
  color: #94a3b8;
  cursor: pointer;
  padding: 0;
  width: 1.375rem;
  height: 1.375rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: 0.25rem;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.gantt__toggle:hover {
  color: var(--gantt-accent);
  background: var(--gantt-accent-soft);
}

.gantt__toggle-icon {
  width: 0.875rem;
  height: 0.875rem;
  transition: transform 0.15s ease;
}

.gantt__toggle-icon--collapsed {
  transform: rotate(-90deg);
}

.gantt__sidebar-row {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0 0.75rem 0 0.5rem;
  transition: background-color 0.12s ease;
}

.gantt__sidebar-row .truncate {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.gantt__sidebar-row:hover {
  background: var(--gantt-row-hover);
}

.gantt__sidebar-row--super-category {
  background: var(--gantt-row-super);
  font-weight: 600;
  font-size: 0.875rem;
  color: #1e293b;
}

.gantt__sidebar-row--super-category:hover {
  background: color-mix(in srgb, var(--gantt-row-super) 70%, #fff);
}

.gantt__sidebar-row--category {
  font-weight: 500;
  font-size: 0.8125rem;
  color: #334155;
}

.gantt__sidebar-row--activity {
  font-size: 0.8125rem;
  color: #475569;
}

.gantt__sidebar-row--activity::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gantt-accent);
  flex-shrink: 0;
  margin-left: 0.125rem;
  opacity: 0.7;
}

.gantt__indent-1 {
  padding-left: 1.5rem;
}

.gantt__indent-2 {
  padding-left: 2.75rem;
}

.gantt__drag-handle {
  color: #cbd5e1;
  cursor: grab;
  flex-shrink: 0;
  display: inline-flex;
  padding: 0.125rem;
  border-radius: 0.25rem;
  transition: color 0.15s ease;
  user-select: none;
  -webkit-user-select: none;
}

.gantt__sidebar-row:hover .gantt__drag-handle {
  color: #94a3b8;
}

.gantt__drag-handle:active {
  cursor: grabbing;
  color: var(--gantt-accent);
}

.gantt__drag-image {
  position: fixed;
  top: -1000px;
  left: -1000px;
  z-index: -1;
  pointer-events: none;
  background: #fff;
  box-shadow: 0 4px 12px rgb(15 23 42 / 0.12);
  border-radius: 0.375rem;
}

.gantt__row-actions {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.125rem;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.12s ease;
}

.gantt__row-actions form {
  display: inline-flex;
  margin: 0;
  line-height: 0;
}

.gantt__sidebar-row:hover .gantt__row-actions,
.gantt__sidebar-row:focus-within .gantt__row-actions {
  opacity: 1;
}

.gantt__row-action {
  color: #94a3b8;
  padding: 0.25rem;
  border-radius: 0.375rem;
  transition: color 0.12s ease, background-color 0.12s ease;
}

.gantt__row-action:hover {
  color: var(--gantt-accent);
  background: var(--gantt-accent-soft);
}

.gantt__row-action--danger:hover {
  color: #dc2626;
  background: #fef2f2;
}

.gantt__sortable-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.gantt__sortable-item {
  margin: 0;
  padding: 0;
  display: block;
}

.gantt__sortable-item--dragging > .gantt__sidebar-row {
  opacity: 0.45;
}

.gantt__sortable-item--dragging > .gantt__sortable-list {
  display: none;
}

.gantt__empty {
  padding: 3rem 1.5rem;
  text-align: center;
  color: #94a3b8;
  font-size: 0.875rem;
  line-height: 1.5;
}

.gantt__schedule-form-card {
  margin-top: 1.5rem;
}