/* タスク関係表示のスタイル */
.task-relations-container {
  margin-bottom: 20px;
  background-color: var(--card-background);
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 15px;
}

.task-relations-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.task-relations-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.view-controls {
  display: flex;
  gap: 10px;
}

.view-btn {
  background-color: var(--light-gray);
  color: var(--text-color);
  border: none;
  border-radius: 4px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;
}

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

/* 選択されたタスク表示 */
.selected-task-display {
  margin-bottom: 15px;
  padding: 12px;
  border-radius: 6px;
  background-color: var(--light-gray);
}

.selected-task {
  margin-bottom: 10px;
}

.selected-task-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.selected-task-header h3 {
  margin: 0;
  font-size: 1.1rem;
}

.task-status {
  padding: 3px 8px;
  border-radius: 10px;
  font-size: 0.8rem;
}

.task-status.completed {
  background-color: var(--success-color);
  color: white;
}

.task-status.pending {
  background-color: var(--warning-color);
  color: white;
}

.task-description {
  margin: 0 0 10px 0;
  font-size: 0.9rem;
  color: var(--light-text-color);
}

.task-relations-info {
  font-size: 0.9rem;
}

.relations-info-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.relation-info {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
}

.relation-label {
  color: var(--light-text-color);
  font-weight: bold;
  min-width: 100px;
}

.relation-value {
  flex: 1;
}

.related-task {
  color: var(--primary-color);
  cursor: pointer;
  text-decoration: underline;
}

.warning-badge {
  background-color: var(--warning-color);
  color: white;
  padding: 3px 6px;
  border-radius: 4px;
  font-size: 0.75rem;
  margin-left: 5px;
}

.no-task-selected {
  text-align: center;
  padding: 20px;
  color: var(--light-text-color);
}

.relation-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 10px;
}

.add-relation-btn, .remove-relation-btn {
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;
  border: none;
}

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

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

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

.remove-relation-btn:hover {
  background-color: var(--danger-color-dark);
}

/* タスクツリー */
.task-tree-container {
  overflow-x: auto;
  max-height: 400px;
}

.task-tree {
  list-style: none;
  padding: 0;
  margin: 0;
}

.child-tasks {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tree-node {
  padding: 5px 0;
  position: relative;
}

.tree-node:before {
  content: '';
  position: absolute;
  left: -15px;
  top: 15px;
  height: 100%;
  width: 2px;
  background-color: var(--border-color);
}

.tree-node:last-child:before {
  height: 0;
}

.tree-node:after {
  content: '';
  position: absolute;
  left: -15px;
  top: 15px;
  width: 15px;
  height: 2px;
  background-color: var(--border-color);
}

.tree-node-content {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.tree-node-content:hover {
  background-color: var(--hover-color);
}

.tree-node.selected > .tree-node-content {
  background-color: var(--selected-color);
}

.tree-node.completed > .tree-node-content {
  opacity: 0.7;
}

.tree-node.completed .task-node-title {
  text-decoration: line-through;
}

.toggle-children-btn {
  background: none;
  border: none;
  padding: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--light-text-color);
  cursor: pointer;
}

.toggle-placeholder {
  width: 20px;
  height: 20px;
}

.task-node-details {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.task-node-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* プログレスバー */
.task-progress-bar {
  height: 8px;
  width: 100px;
  background-color: var(--light-gray);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.task-progress-bar.small {
  height: 5px;
  width: 50px;
}

.progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 4px;
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.7rem;
  font-weight: bold;
  color: white;
  mix-blend-mode: difference;
}

/* 依存関係表示 */
.dependencies-container {
  margin-top: 20px;
}

.dependencies-diagram {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
}

.dependencies-section {
  width: 100%;
}

.dependencies-section h4 {
  margin: 0 0 10px 0;
  text-align: center;
  font-size: 1rem;
  color: var(--light-text-color);
}

.related-tasks {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
  padding: 10px;
  border-radius: 6px;
  background-color: var(--light-gray);
}

.related-task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px;
  border-radius: 4px;
  background-color: var(--card-background);
  cursor: pointer;
  transition: transform 0.2s;
}

.related-task-item:hover {
  transform: translateY(-2px);
}

.related-task-item.completed {
  opacity: 0.7;
}

.related-task-item.completed .task-title {
  text-decoration: line-through;
}

.current-task-section {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  margin: 10px 0;
}

.current-task-section:before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--border-color);
  z-index: 1;
}

.current-task {
  position: relative;
  z-index: 2;
  padding: 10px 15px;
  border-radius: 6px;
  background-color: var(--selected-color);
  border: 2px solid var(--primary-color);
  font-weight: bold;
}

.empty-message {
  text-align: center;
  color: var(--light-text-color);
  font-style: italic;
  padding: 10px;
}

/* モーダル */
.relation-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.relation-modal .modal-content {
  background-color: var(--card-background);
  border-radius: 8px;
  padding: 20px;
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
}

.selected-task-info {
  background-color: var(--light-gray);
  padding: 10px;
  border-radius: 4px;
  margin-bottom: 15px;
  font-weight: bold;
}

.warning {
  color: var(--warning-color);
  font-size: 0.85rem;
  margin-top: 5px;
}

.help-text {
  color: var(--light-text-color);
  font-size: 0.85rem;
  margin-top: 5px;
}

.relation-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 4px;
  margin-bottom: 5px;
}

.relation-option:hover {
  background-color: var(--hover-color);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
}

.form-actions button {
  padding: 8px 16px;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
}

.cancel-btn, .close-btn {
  background-color: var(--light-gray);
  color: var(--text-color);
}

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

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

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .dependencies-diagram {
    flex-direction: column;
  }
  
  .task-progress-bar {
    width: 80px;
  }
  
  .relation-info {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .relation-label {
    min-width: auto;
  }
}