/* Gantt Chart Container */
.gantt-wrapper {
  display: flex;
  flex: 1;
  height: calc(100vh - 120px);
  position: relative;
  overflow: hidden;
  background-color: var(--bg-surface);
}

/* Left Panel: Task List / Hierarchy */
.gantt-sidebar {
  width: 380px;
  min-width: 280px;
  max-width: 550px;
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  background-color: var(--bg-surface);
  z-index: 10;
  flex-shrink: 0;
}

.gantt-sidebar-header {
  height: 52px;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--gantt-header-bg);
  display: flex;
  align-items: center;
  padding: 0 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  justify-content: space-between;
}

.gantt-sidebar-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
}

/* Split Pane Resizer */
.gantt-resizer {
  width: 5px;
  cursor: col-resize;
  background-color: transparent;
  transition: background-color var(--transition-fast);
  z-index: 20;
}

.gantt-resizer:hover, .gantt-resizer.active {
  background-color: var(--color-primary);
}

/* Right Panel: Interactive Timeline */
.gantt-timeline-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-app);
  position: relative;
}

.gantt-timeline-header-container {
  height: 52px;
  min-height: 52px;
  overflow: hidden;
  background-color: var(--gantt-header-bg);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.gantt-timeline-body-container {
  flex: 1;
  min-width: 0;
  overflow: auto;
  position: relative;
  background-color: var(--bg-app);
  overscroll-behavior: contain;
}

.gantt-timeline-scale-primary {
  height: 26px;
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
}

.gantt-timeline-scale-secondary {
  height: 26px;
  display: flex;
}

.scale-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-right: 1px solid var(--border-subtle);
  user-select: none;
}

.scale-cell.weekend {
  background-color: var(--gantt-weekend-header-bg);
  color: var(--gantt-weekend-text);
  font-weight: 700;
  border-right-color: var(--gantt-weekend-border);
}

.scale-cell .day-letter {
  font-size: 0.7rem;
  opacity: 0.8;
  margin-right: 2px;
}

.scale-cell.weekend .day-letter {
  opacity: 1;
  font-weight: 800;
  color: var(--gantt-weekend-text);
}

/* Timeline Body */
.gantt-timeline-body {
  position: relative;
  min-height: 100%;
}

.gantt-grid-columns {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  pointer-events: none;
  z-index: 1;
}

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

/* Visually highlighted weekend columns in Days view */
.gantt-grid-col.weekend {
  background-color: var(--gantt-weekend-bg);
  border-right-color: var(--gantt-weekend-border);
  position: relative;
}

.gantt-grid-col.weekend::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 6px,
    rgba(212, 106, 128, 0.03) 6px,
    rgba(212, 106, 128, 0.03) 12px
  );
  pointer-events: none;
}

/* Visually highlighted weekend in Weeks view (Saturday & Sunday: last 28.6% of week cell) */
.gantt-grid-col.week-col {
  position: relative;
  background: linear-gradient(
    to right,
    transparent 0%,
    transparent calc(100% * 5 / 7),
    var(--gantt-weekend-bg) calc(100% * 5 / 7),
    var(--gantt-weekend-bg) 100%
  );
}

.gantt-grid-col.week-col::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(100% * 5 / 7);
  width: 1px;
  border-left: 1px dashed var(--gantt-weekend-border);
  pointer-events: none;
}

/* SVG Dependency Layer */
.gantt-dependency-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

.dependency-line {
  stroke: var(--color-primary);
  stroke-width: 2;
  stroke-dasharray: 4 2;
  fill: none;
  opacity: 0.75;
  transition: stroke var(--transition-fast);
}

.dependency-arrow {
  fill: var(--color-primary);
}

/* Vertical Markers: Today & Wedding Day */
.gantt-marker-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  z-index: 12;
  pointer-events: none;
}

.gantt-marker-today {
  background-color: var(--color-primary);
  box-shadow: 0 0 8px rgba(212, 106, 128, 0.6);
}

.gantt-marker-wedding {
  background-color: var(--color-gold);
  width: 3px;
  box-shadow: 0 0 10px rgba(197, 160, 89, 0.7);
}

.marker-label {
  position: sticky;
  top: 56px;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  white-space: nowrap;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  box-shadow: var(--shadow-sm);
}

.gantt-marker-today .marker-label {
  background-color: var(--color-primary);
  color: #fff;
}

.gantt-marker-wedding .marker-label {
  background-color: var(--color-gold);
  color: #fff;
}

/* Rows in Sidebar and Timeline */
.gantt-row {
  height: 44px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  transition: background-color var(--transition-fast);
}

.gantt-sidebar .gantt-row:nth-child(even) {
  background-color: var(--gantt-row-even);
}

.gantt-sidebar .gantt-row:nth-child(odd) {
  background-color: var(--gantt-row-odd);
}

.gantt-sidebar .gantt-row:hover, .gantt-sidebar .gantt-row.hovered {
  background-color: var(--gantt-row-hover);
}

.gantt-bars-layer .gantt-row {
  background-color: transparent !important;
}

.gantt-bars-layer .gantt-row:hover, .gantt-bars-layer .gantt-row.hovered {
  background-color: rgba(212, 106, 128, 0.04) !important;
}

/* Category Group Header Rows */
.gantt-row-category {
  background-color: var(--bg-surface-alt) !important;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.category-toggle-icon {
  margin-right: 0.5rem;
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

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

/* Sidebar Row Content */
.sidebar-row-content {
  display: flex;
  align-items: center;
  padding: 0 0.85rem;
  width: 100%;
  gap: 0.65rem;
}

.task-checkbox {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1.5px solid var(--border-subtle);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.task-checkbox:hover {
  border-color: var(--color-primary);
}

.task-checkbox.completed {
  background-color: #217346;
  border-color: #217346;
  color: #fff;
}

.sidebar-task-title {
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  color: var(--text-primary);
  cursor: pointer;
}

.sidebar-task-title:hover {
  color: var(--color-primary);
}

.sidebar-task-title.completed {
  text-decoration: line-through;
  color: var(--text-muted);
}

.assignee-badge {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.68rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.assignee-badge.partner1 {
  background-color: var(--partner1-color);
}

.assignee-badge.partner2 {
  background-color: var(--partner2-color);
}

.assignee-badge.both {
  background-color: var(--both-color);
}

.assignee-badge.unassigned {
  background-color: var(--unassigned-color);
}

.task-row-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.gantt-row:hover .task-row-actions {
  opacity: 1;
}

/* Timeline Task Bars */
.gantt-task-bar {
  position: absolute;
  top: 7px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-gradient);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
  color: #fff;
  display: flex;
  align-items: center;
  padding: 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: move;
  z-index: 6;
  user-select: none;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.gantt-task-bar:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  z-index: 8;
  filter: brightness(1.05);
}

.gantt-task-bar.status-done {
  opacity: 0.8;
  filter: saturate(0.85);
}

.gantt-task-bar.status-done .task-bar-content span::before {
  content: '✓ ';
  font-weight: 700;
  margin-right: 2px;
}

/* Progress Fill inside Task Bar */
.task-bar-progress {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.18);
  pointer-events: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.task-bar-content {
  position: relative;
  z-index: 2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  width: 100%;
}

/* Resize Handles */
.resize-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 8px;
  cursor: ew-resize;
  z-index: 4;
}

.resize-handle-left {
  left: 0;
}

.resize-handle-right {
  right: 0;
}

.resize-handle:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

/* Milestone Diamond */
.gantt-milestone-marker {
  position: absolute;
  top: 9px;
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, #F3C363 0%, #C5A059 100%);
  transform: rotate(45deg);
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(197, 160, 89, 0.5);
  cursor: pointer;
  z-index: 7;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.gantt-milestone-marker:hover {
  transform: rotate(45deg) scale(1.15);
  box-shadow: 0 4px 14px rgba(197, 160, 89, 0.7);
  z-index: 9;
}

.gantt-milestone-marker::after {
  content: '💍';
  transform: rotate(-45deg);
  font-size: 0.75rem;
}

.milestone-label-text {
  position: absolute;
  top: 10px;
  margin-left: 18px;
  white-space: nowrap;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  pointer-events: none;
  background: var(--bg-surface);
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

/* Dragging Tooltip */
.drag-date-tooltip {
  position: fixed;
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 600;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -120%);
  white-space: nowrap;
}