/* ========================================
   Kanban Board Styles
   ======================================== */

/* Main Layout */
.kanban-main {
  min-height: calc(100vh - var(--header-height) - var(--footer-height));
  background: var(--color-bg-tertiary);
  padding: var(--space-6) 0;
}

.kanban-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Header */
.kanban-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.kanban-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0;
}

.kanban-stats {
  display: flex;
  gap: var(--space-6);
}

.kanban-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.kanban-stat-value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.kanban-stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.kanban-stat-progress .kanban-stat-value {
  color: var(--color-success);
}

/* Search Bar */
.kanban-search {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: var(--space-4);
}

.kanban-search-icon {
  position: absolute;
  left: var(--space-4);
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
}

.kanban-search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  padding-left: calc(var(--space-4) + 26px);
  padding-right: calc(var(--space-4) + 32px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  font-size: var(--font-size-sm);
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.kanban-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.kanban-search-input::placeholder {
  color: var(--color-text-muted);
}

.kanban-search-clear {
  position: absolute;
  right: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.kanban-search-clear:hover {
  color: var(--color-text-primary);
  background: var(--color-gray-100);
}

.kanban-search-clear svg {
  width: 16px;
  height: 16px;
}

/* Filter Bar */
.kanban-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  padding: var(--space-3);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.kanban-filter {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-white);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kanban-filter:hover {
  background: var(--color-gray-100);
  border-color: var(--color-gray-300);
}

.kanban-filter.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.kanban-filter[data-phase]:not([data-phase="all"]).active {
  background: var(--filter-color);
  border-color: var(--filter-color);
}

.filter-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--filter-color);
}

.kanban-filter.active .filter-dot {
  background: var(--color-white);
}

/* Filter count badge */
.filter-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-left: var(--space-1);
}

.kanban-filter.active .filter-count {
  color: rgba(255, 255, 255, 0.8);
}

.kanban-add-task-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin-left: auto;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kanban-add-task-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.kanban-add-task-btn svg {
  width: 16px;
  height: 16px;
}

/* Kanban Board - 3 Columns */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
  min-height: 500px;
}

/* Columns */
.kanban-column {
  display: flex;
  flex-direction: column;
  background: var(--color-gray-100);
  border-radius: var(--radius-lg);
  min-height: 400px;
}

.kanban-column[data-status="todo"] {
  --column-color: var(--color-gray-500);
}

.kanban-column[data-status="in_progress"] {
  --column-color: var(--color-primary);
}

.kanban-column[data-status="done"] {
  --column-color: var(--color-success);
}

.kanban-column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4);
  border-bottom: 2px solid var(--column-color);
}

.kanban-column-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

.column-icon {
  font-size: 1.1em;
}

.kanban-column-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 var(--space-2);
  background: var(--column-color);
  color: var(--color-white);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.kanban-column-items {
  flex: 1;
  padding: var(--space-3);
  overflow-y: auto;
  min-height: 200px;
}

/* Cards */
.kanban-card {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  padding-left: calc(var(--space-4) + 20px);
  margin-bottom: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  border-left: 4px solid var(--card-phase-color, var(--color-gray-300));
}

/* Drag Handle */
.kanban-card-drag-handle {
  position: absolute;
  left: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-400);
  cursor: grab;
  opacity: 0.5;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.kanban-card-drag-handle svg {
  width: 12px;
  height: 18px;
}

.kanban-card:hover .kanban-card-drag-handle {
  opacity: 1;
  color: var(--color-gray-600);
}

.kanban-card-drag-handle:active {
  cursor: grabbing;
}

.kanban-card:hover {
  box-shadow: var(--shadow-md);
}

.kanban-card.keyboard-focused {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: var(--shadow-md);
}

.kanban-card.custom-task {
  border-left-style: dashed;
}

.kanban-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.kanban-card-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  line-height: var(--line-height-tight);
}

.kanban-card-step-number {
  flex-shrink: 0;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--card-phase-color, var(--color-text-muted));
  background: var(--card-phase-light, var(--color-gray-100));
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.kanban-card-description {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kanban-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border-light);
}

.kanban-card-phase-badge {
  font-size: var(--font-size-xs);
  color: var(--card-phase-color, var(--color-text-muted));
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.kanban-card-phase-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--card-phase-color, var(--color-gray-400));
}

.kanban-card-actions {
  margin-left: auto;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.kanban-card:hover .kanban-card-actions {
  opacity: 1;
}

.kanban-card-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.kanban-card-action-btn:hover {
  background: var(--color-gray-100);
  color: var(--color-text-primary);
}

.kanban-card-action-btn svg {
  width: 14px;
  height: 14px;
}

/* Drag States */
.kanban-card.sortable-ghost {
  opacity: 0.4;
  background: var(--color-gray-200);
}

.kanban-card.sortable-chosen {
  box-shadow: var(--shadow-lg);
  transform: rotate(3deg);
}

.kanban-card.sortable-drag {
  box-shadow: var(--shadow-xl);
}

.kanban-column-items.sortable-drop-zone {
  background: var(--color-primary-light);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-md);
}

/* Phase Colors on Cards */
.kanban-card[data-phase="1"] {
  --card-phase-color: var(--phase-1-color);
  --card-phase-light: var(--phase-1-light);
}
.kanban-card[data-phase="2"] {
  --card-phase-color: var(--phase-2-color);
  --card-phase-light: var(--phase-2-light);
}
.kanban-card[data-phase="3"] {
  --card-phase-color: var(--phase-3-color);
  --card-phase-light: var(--phase-3-light);
}
.kanban-card[data-phase="4"] {
  --card-phase-color: var(--phase-4-color);
  --card-phase-light: var(--phase-4-light);
}
.kanban-card[data-phase="5"] {
  --card-phase-color: var(--phase-5-color);
  --card-phase-light: var(--phase-5-light);
}
.kanban-card[data-phase="6"] {
  --card-phase-color: var(--phase-6-color);
  --card-phase-light: var(--phase-6-light);
}

/* Empty State */
.kanban-column-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  color: var(--color-text-muted);
  text-align: center;
}

.kanban-column-empty-icon {
  font-size: 2rem;
  margin-bottom: var(--space-2);
  opacity: 0.5;
}

.kanban-column-empty-text {
  font-size: var(--font-size-sm);
}

/* Modals */
.kanban-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  padding: var(--space-4);
}

.kanban-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.kanban-modal {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: transform var(--transition-base);
}

.kanban-modal-overlay.active .kanban-modal {
  transform: translateY(0);
}

.kanban-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.kanban-modal-header h2 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin: 0;
}

.kanban-modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.kanban-modal-close:hover {
  background: var(--color-gray-100);
  color: var(--color-text-primary);
}

.kanban-modal-close svg {
  width: 20px;
  height: 20px;
}

.kanban-modal-body {
  padding: var(--space-5);
}

.kanban-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-gray-50);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* Form Styles */
.kanban-form-group {
  margin-bottom: var(--space-4);
}

.kanban-form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.kanban-form-group input,
.kanban-form-group textarea,
.kanban-form-group select {
  width: 100%;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.kanban-form-group input:focus,
.kanban-form-group textarea:focus,
.kanban-form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.kanban-form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.kanban-form-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

/* Buttons */
.kanban-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kanban-btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.kanban-btn-primary:hover {
  background: var(--color-primary-dark);
}

.kanban-btn-secondary {
  background: var(--color-gray-100);
  color: var(--color-text-primary);
}

.kanban-btn-secondary:hover {
  background: var(--color-gray-200);
}

.kanban-btn-danger {
  background: var(--color-danger);
  color: var(--color-white);
}

.kanban-btn-danger:hover {
  background: #c82333;
}

.kanban-btn-link {
  background: transparent;
  color: var(--color-primary);
  padding: var(--space-2) var(--space-3);
}

.kanban-btn-link:hover {
  background: var(--color-primary-light);
}

/* Card Detail Modal Content */
.card-detail-phase {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--card-phase-light, var(--color-gray-100));
  color: var(--card-phase-color, var(--color-text-secondary));
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
}

.card-detail-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

.card-detail-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
}

.card-detail-link:hover {
  text-decoration: underline;
}

.card-detail-link svg {
  width: 16px;
  height: 16px;
}

/* Custom Task Badge */
.custom-task-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 8px;
  background: var(--color-gray-100);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  margin-left: auto;
}

/* Due Date Badge */
.kanban-card-due-date {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  margin-left: auto;
}

.kanban-card-due-date svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

.kanban-card-due-date.due-overdue {
  background: #fef2f2;
  color: #dc2626;
}

.kanban-card-due-date.due-today {
  background: #fef3c7;
  color: #d97706;
}

.kanban-card-due-date.due-soon {
  background: #fef9c3;
  color: #ca8a04;
}

.kanban-card-due-date.due-future {
  background: var(--color-gray-100);
  color: var(--color-text-muted);
}

/* Form Row */
.kanban-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 480px) {
  .kanban-form-row {
    grid-template-columns: 1fr;
  }
}

/* Undo Toast */
.kanban-toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-gray-900);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-tooltip);
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.kanban-toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.kanban-toast-message {
  font-size: var(--font-size-sm);
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kanban-toast-undo {
  padding: var(--space-1) var(--space-3);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kanban-toast-undo:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.kanban-toast-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  font-size: 18px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.kanban-toast-close:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

/* Responsive Design */
@media (max-width: 900px) {
  .kanban-board {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .kanban-column {
    min-height: auto;
  }

  .kanban-column-items {
    min-height: 150px;
    max-height: 400px;
  }

  .kanban-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .kanban-stats {
    width: 100%;
    justify-content: space-around;
  }

  .kanban-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .kanban-filters::-webkit-scrollbar {
    display: none;
  }

  .kanban-filter {
    flex-shrink: 0;
  }

  .kanban-add-task-btn {
    margin-left: 0;
  }
}

@media (max-width: 480px) {
  .kanban-container {
    padding: 0 var(--space-3);
  }

  .kanban-main {
    padding: var(--space-4) 0;
  }

  .kanban-title {
    font-size: var(--font-size-xl);
  }

  .kanban-filters {
    padding: var(--space-2);
  }

  .kanban-filter {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
  }

  .kanban-card {
    padding: var(--space-3);
    padding-left: calc(var(--space-3) + 20px);
  }

  .kanban-modal {
    max-width: none;
    margin: var(--space-2);
    max-height: calc(100vh - var(--space-4));
  }

  .kanban-toast {
    left: var(--space-3);
    right: var(--space-3);
    transform: translateX(0) translateY(100px);
    bottom: var(--space-4);
  }

  .kanban-toast.visible {
    transform: translateX(0) translateY(0);
  }

  .kanban-toast-message {
    flex: 1;
    max-width: none;
  }
}

/* Print Styles */
@media print {
  .kanban-filters,
  .kanban-add-task-btn,
  .kanban-card-actions {
    display: none;
  }

  .kanban-board {
    grid-template-columns: repeat(3, 1fr);
  }

  .kanban-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--color-border);
  }
}

/* Accessibility */
.kanban-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .kanban-card,
  .kanban-modal,
  .kanban-modal-overlay {
    transition: none;
  }
}