/* ==========================================================================
   Kanban Board Styles (Columns, Issue Cards, Swimlanes, Drag & Drop)
   ========================================================================== */

.board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
  min-width: 0;
  width: 100%;
}

.board-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex-shrink: 1;
}

.board-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.board-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.board-filters {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 4px 6px;
  border-radius: var(--radius-md);
}

.filter-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface-elevated);
}

.filter-btn.active {
  background: var(--brand-primary);
  color: #ffffff;
  font-weight: 600;
}

/* Kanban Board Container */
.kanban-board {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 16px;
  min-height: calc(100vh - 180px);
  align-items: flex-start;
  max-width: 100%;
}

/* Kanban Column */
.kanban-column {
  width: 300px;
  min-width: 300px;
  max-width: 300px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 190px);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.kanban-column.drag-over {
  border-color: var(--brand-primary);
  background: var(--bg-surface);
}

.column-header {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.column-title-wrapper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.column-color-indicator {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
}

.column-title {
  font-size: 0.84rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.column-badge {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-weight: 600;
  border: 1px solid var(--border-subtle);
}

.column-wip-warning {
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.4);
}

.column-body {
  padding: 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-height: 120px;
}

/* Issue Card */
.issue-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 12px;
  box-shadow: var(--shadow-sm);
  cursor: grab;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  user-select: none;
}

.issue-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-focus);
}

.issue-card.dragging {
  opacity: 0.4;
  cursor: grabbing;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 8px;
}

.card-epic-tag {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--type-epic);
  background: var(--type-epic-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.card-meta-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-meta-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-key {
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-weight: 600;
}

.card-subtasks {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 3px;
}

.card-avatar {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.68rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--brand-primary);
}

/* Swimlanes */
.swimlane-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
}

.swimlane-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.swimlane-header:hover {
  background: var(--bg-surface-elevated);
}

.swimlane-title {
  font-weight: 600;
  font-size: 0.92rem;
}

/* Responsive Board Adjustments */
@media (max-width: 768px) {
  .board-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .board-title-group {
    width: 100%;
  }
  .board-controls {
    width: 100%;
    justify-content: space-between;
  }
  .board-filters {
    overflow-x: auto;
    max-width: 100%;
    padding: 3px;
  }
  .kanban-board {
    gap: 12px;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
  }
  .kanban-column {
    width: 270px;
    min-width: 270px;
    max-width: 270px;
    scroll-snap-align: start;
    max-height: calc(100vh - 230px);
  }
}

@media (max-width: 480px) {
  .kanban-column {
    width: 250px;
    min-width: 250px;
    max-width: 250px;
  }
}