/* ============================================
   KANBAN — Columns, Cards
   ============================================ */

/* ---- Column ---- */
.column {
  flex-shrink: 0;
  width: var(--column-width);
  max-height: 100%;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-lg);
  background: var(--surface-sunken);
  transition: background-color var(--transition-slow);
}

.column__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4) var(--space-3);
  position: sticky;
  top: 0;
  z-index: 1;
}

.column__header-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.column__icon {
  font-size: 1rem;
  line-height: 1;
}

.column__title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.column__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-hover);
  border-radius: var(--radius-full);
}

.column__header-right {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* ---- Column Body (scrollable task list) ---- */
.column__body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 var(--space-3) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 80px;
  transition: background-color var(--transition-fast), border var(--transition-fast);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  margin: 0 var(--space-1) var(--space-1);
}

/* ---- Column Footer (add task) ---- */
.column__footer {
  padding: var(--space-2) var(--space-3) var(--space-3);
}

.column__add-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  font-size: 0.8125rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.column__add-btn:hover {
  background: var(--bg-hover);
  color: var(--text-secondary);
}

.column__add-btn svg {
  width: 16px;
  height: 16px;
}

/* ---- Card ---- */
.card {
  position: relative;
  background: var(--surface-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  user-select: none;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

.card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--card-priority-color, var(--priority-medium));
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

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

.card:hover::before {
  opacity: 1;
}

.card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Priority variants */
.card--urgent { --card-priority-color: var(--priority-urgent); }
.card--high   { --card-priority-color: var(--priority-high); }
.card--medium { --card-priority-color: var(--priority-medium); }
.card--low    { --card-priority-color: var(--priority-low); }

/* ---- Card Content ---- */
.card__title {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: var(--space-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.card__meta-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.card__assignee {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.card__assignee-avatar {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.625rem;
  font-weight: 600;
  color: white;
  flex-shrink: 0;
}

.card__due-date {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: center;
  gap: 3px;
}

.card__due-date svg {
  width: 12px;
  height: 12px;
}

.card__due-date--overdue {
  color: var(--danger);
  font-weight: 500;
}

.card__due-date--today {
  color: var(--warning);
  font-weight: 500;
}

/* ---- Card Footer (tags + indicators) ---- */
.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.card__tags {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
  min-width: 0;
}

.card__tag {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  font-size: 0.6875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  white-space: nowrap;
  line-height: 1.6;
}

.card__indicators {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.card__indicator {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 0.6875rem;
  color: var(--text-tertiary);
}

.card__indicator svg {
  width: 14px;
  height: 14px;
}

/* ---- Quick Actions (on hover) ---- */
.card__actions {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  display: none;
  gap: var(--space-1);
}

.card:hover .card__actions {
  display: flex;
}

/* ---- Empty Column ---- */
.column__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
  text-align: center;
}

.column__empty-icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
  opacity: 0.5;
}

.column__empty-text {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* ---- Mobile ---- */
@media (max-width: 768px) {
  .column {
    width: 85vw;
    min-width: 280px;
    scroll-snap-align: center;
  }
}