/* ========== KANBAN LAYOUT - Board, columns, header ========== */

/* ========== ASSEMBLY LINE HEADER ========== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-xl);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Station badge */
.station-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.station-badge__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: var(--font-xs);
}

.station-badge__label {
  font-size: var(--font-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--text-muted);
}

/* Project title */
.header h1 {
  font-size: var(--font-lg);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
}

/* Stat group */
.stat-group {
  display: flex;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-tertiary);
}

.stat-item__value {
  font-size: var(--font-sm);
  font-weight: 600;
  color: var(--text-primary);
  min-width: 20px;
  text-align: right;
}

.stat-item__label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--text-muted);
}

.stat-item--backlog .stat-item__value {
  color: #6366f1;
}

.stat-item--progress .stat-item__value {
  color: #fbbf24;
}

.stat-item--done .stat-item__value {
  color: #22c55e;
}

/* Search input */
.search-input {
  width: 120px;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-sm);
}

/* Action group */
.action-group {
  display: flex;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.action-group .btn {
  border-radius: 0;
  border: none;
}

.action-group .btn:first-child {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.action-group .btn:last-child {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* Ghost button variant */
.btn--ghost {
  background: var(--bg-tertiary);
  border: none;
  color: var(--text-secondary);
}

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

/* Responsive header */
@media (max-width: 900px) {
  .header {
    flex-wrap: wrap;
  }

  .header-right {
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  .header-left {
    flex-wrap: wrap;
    width: 100%;
  }

  .header-right {
    width: 100%;
    justify-content: flex-start;
  }

  .stat-item__label {
    display: none;
  }

  .action-group {
    display: none;
  }
}

/* ========== BOARD CONTAINER ========== */
.board-container {
  padding: var(--spacing-lg);
  min-height: calc(100vh - 52px);
  overflow-x: auto;
}

/* ========== KANBAN BOARD ========== */
.kanban-board {
  display: flex;
  gap: var(--spacing-lg);
  min-height: calc(100vh - 100px);
  align-items: flex-start;
}

.kanban-board.loading {
  justify-content: center;
  align-items: center;
  color: var(--text-muted);
}

/* ========== COLUMNS ========== */
.kanban-column {
  flex: 0 0 300px;
  min-width: 280px;
  max-width: 340px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 100px);
}

.kanban-column--collapsed {
  flex: 0 0 48px;
  min-width: 48px;
  max-width: 48px;
}

/* Column header */
.column-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.column-header__color {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.column-header__title {
  font-size: var(--font-md);
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.column-header__count {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 var(--spacing-xs);
  background: var(--station-bg);
  border: 1px solid var(--station-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-xs);
  font-weight: 600;
  color: var(--text-muted);
}

.column-header__collapse {
  padding: var(--spacing-xs);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.column-header__collapse:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Collapsed column */
.kanban-column--collapsed .column-header {
  flex-direction: column;
  padding: var(--spacing-md) var(--spacing-sm);
  border-radius: var(--radius-xl);
  height: 100%;
  min-height: 200px;
}

.kanban-column--collapsed .column-header__title {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  white-space: nowrap;
}

.kanban-column--collapsed .column-cards,
.kanban-column--collapsed .column-footer {
  display: none;
}

/* Column cards area */
.column-cards {
  flex: 1;
  padding: var(--spacing-md);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  min-height: 100px;
}

/* Drop zone indicator */
.column-cards.drag-over {
  background: var(--accent-subtle);
  border-radius: var(--radius-md);
}

/* Hide empty state when dragging over */
.column-cards.drag-over .column-empty-state {
  display: none;
}

.column-cards--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--font-sm);
  min-height: 100px;
}

/* Empty state should not block drag events */
.column-empty-state {
  pointer-events: none;
}

/* Column footer */
.column-footer {
  padding: var(--spacing-sm) var(--spacing-md);
  border-top: 1px solid var(--border);
}

.column-add-btn {
  width: 100%;
  padding: var(--spacing-sm);
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: var(--font-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.column-add-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* ========== COLUMN SETTINGS ========== */
.column-settings {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.column-setting-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: grab;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.column-setting-row:hover {
  border-color: var(--accent);
}

.column-setting-row.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.column-setting-row.drag-over {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.column-setting-row--default {
  cursor: default;
}

.column-setting-row__drag {
  color: var(--text-muted);
  cursor: grab;
  padding: var(--spacing-xs);
}

.column-setting-row__drag:hover {
  color: var(--text-secondary);
}

.column-setting-row__color-input {
  width: 32px;
  height: 32px;
  padding: 0;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
}

.column-setting-row__color-input::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.column-setting-row__color-input::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

.column-setting-row__name-input {
  flex: 1;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.column-setting-row__name-input:focus {
  outline: none;
  border-color: var(--accent);
}

.column-setting-row__badge {
  font-size: var(--font-xs);
  color: var(--text-muted);
  padding: 2px var(--spacing-xs);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
}

.column-setting-row__delete {
  padding: var(--spacing-xs);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.column-setting-row__delete:hover {
  background: var(--status-error-subtle);
  color: var(--status-error);
}

.column-setting-row__delete:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.column-setting-row__delete:disabled:hover {
  background: transparent;
  color: var(--text-muted);
}

/* Form hint text */
.form-hint {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
}

/* Wide modal variant */
.modal-panel--wide {
  max-width: 500px;
}