/* ===== 统一知识图谱浏览器布局 ===== */
.explorer-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--navbar-height));
  overflow: hidden;
  margin-top: var(--navbar-height);
}

/* ===== 顶部导航栏 ===== */
.explorer-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  flex-wrap: wrap;
  row-gap: var(--space-1);
}

.explorer-nav .subject-select {
  padding: 4px 12px;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  font-size: var(--text-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-width: 120px;
}

.explorer-nav .subject-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}

.explorer-nav .nav-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 3px;
}

.explorer-nav .nav-tab {
  padding: 6px 20px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.explorer-nav .nav-tab.active {
  background: var(--bg-primary);
  color: var(--primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.explorer-nav .nav-tab:hover:not(.active) {
  color: var(--text-primary);
}

.explorer-nav .nav-spacer {
  flex: 1;
}

.explorer-nav .nav-badge {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-left: var(--space-2);
}

.explorer-nav .nav-stat {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  white-space: nowrap;
}

.explorer-nav .nav-stat b {
  font-weight: 600;
  color: var(--text-primary);
}

.explorer-nav .nav-sep {
  width: 1px;
  height: 18px;
  background: var(--border-medium);
  flex-shrink: 0;
}

.explorer-nav .nav-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  margin: 0;
  padding-left: 2px;
}

.explorer-nav .nav-switch .form-check-label {
  font-size: var(--text-xs);
}

/* legend items & connect buttons inside explorer-nav */
.explorer-nav .legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
  white-space: nowrap;
}

.explorer-nav .legend-item:hover {
  background: var(--bg-secondary);
}

.explorer-nav .legend-item.legend-active {
  background: var(--bg-secondary);
  border-color: var(--border-medium);
}

.legend-dot {
  width: 18px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}

.legend-dot.depends_on { background: #0071e3; }
.legend-dot.applies { background: #ff9500; }
.legend-dot.covers { background: #34c759; }

.explorer-nav .connect-btn {
  padding: 3px 10px;
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  background: var(--bg-primary);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.explorer-nav .connect-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.explorer-nav .connect-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ===== 树视图布局 ===== */
.tree-view {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.tree-panel {
  width: 400px;
  min-width: 300px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-light);
  background: var(--bg-primary);
}

.tree-panel-header {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.tree-panel-toolbar {
  display: flex;
  gap: 4px;
  padding: var(--space-1) var(--space-2);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  flex-wrap: wrap;
  align-items: center;
}

.toolbar-icon-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  font-size: 15px;
}

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

.toolbar-icon-btn.active {
  background: var(--primary-bg);
  color: var(--primary);
}

.tree-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2) 0;
}

/* 树节点样式 */
.tree-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tree-list .tree-list {
  padding-left: 0;
}

.tree-node-item {
  user-select: none;
}

.tree-node-content {
  display: flex;
  align-items: center;
  padding: 3px 8px 3px 0;
  cursor: pointer;
  transition: background 0.1s;
  min-height: 30px;
  position: relative;
}

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

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

.tree-node-content.disabled-node {
  opacity: 0.5;
  background: var(--bg-secondary);
}

.tree-node-indent {
  display: flex;
  flex-shrink: 0;
}

.tree-node-guide {
  width: 20px;
  flex-shrink: 0;
  position: relative;
}

.tree-node-guide.has-line::after {
  content: '';
  position: absolute;
  left: 9px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border-light);
}

.tree-node-bullet {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 4px;
  position: relative;
  z-index: 1;
}

.tree-node-bullet::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}

.tree-node-bullet.leaf::before {
  width: 5px;
  height: 5px;
  border: 1.5px solid var(--text-muted);
  background: transparent;
}

.tree-node-expander {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 2px;
  transition: transform 0.15s;
  opacity: 0.5;
  cursor: pointer;
}

.tree-node-expander:hover {
  opacity: 1;
}

.tree-node-expander.expanded {
  transform: rotate(90deg);
}

.tree-node-expander.leaf {
  visibility: hidden;
}

.tree-node-name {
  flex: 1;
  font-size: var(--text-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-node-badge {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 10px;
  flex-shrink: 0;
  margin-left: 4px;
}

.tree-node-badge.count {
  background: var(--primary-bg);
  color: var(--primary);
}

.tree-node-badge.disabled-badge {
  background: #fee2e2;
  color: #dc2626;
  font-size: 10px;
}

/* ===== 编辑面板 ===== */
.edit-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  overflow-y: auto;
}

.edit-panel-header {
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.edit-panel-body {
  flex: 1;
  padding: var(--space-4);
  overflow-y: auto;
}

.edit-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  gap: var(--space-3);
}

.edit-form-section {
  margin-bottom: var(--space-4);
}

.edit-form-section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--border-light);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.form-actions {
  display: flex;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-light);
}

/* ===== 图谱视图 ===== */
.graph-view {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.graph-svg-container {
  width: 100%;
  height: 100%;
}

/* 图提示框 */
.graph-tooltip {
  position: fixed;
  z-index: 1000;
  max-width: 320px;
  padding: 10px 14px;
  background: rgba(30, 30, 32, 0.94);
  backdrop-filter: blur(8px);
  color: #fff;
  border-radius: 10px;
  font-size: var(--text-xs);
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
}

.graph-tooltip .tt-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin-bottom: 4px;
  opacity: 0.8;
}

.graph-tooltip .tt-sep {
  margin: 0 2px;
  opacity: 0.5;
}

.graph-tooltip .tt-title {
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: 2px;
}

.graph-tooltip .tt-desc {
  opacity: 0.7;
  margin-bottom: 4px;
}

.graph-tooltip .tt-meta {
  opacity: 0.6;
  font-size: 11px;
}

/* ===== 模态框 ===== */
.parent-tree-modal-body {
  max-height: 50vh;
  overflow-y: auto;
}

/* 响应式 */
@media (max-width: 992px) {
  .tree-view {
    flex-direction: column;
  }
  .tree-panel {
    width: 100%;
    height: 45%;
    min-width: unset;
  }
}

/* 移动端：nav 自动换行 */
@media (max-width: 768px) {
  .explorer-nav {
    padding: var(--space-1) var(--space-2);
    gap: 4px;
    row-gap: 4px;
  }
  .explorer-nav .nav-tab {
    padding: 4px 10px;
    font-size: var(--text-xs);
  }
  .explorer-nav .subject-select {
    min-width: 90px;
    padding: 3px 8px;
    font-size: var(--text-xs);
  }
  .explorer-nav .legend-item {
    padding: 1px 6px;
    font-size: 11px;
  }
  .explorer-nav .connect-btn {
    padding: 2px 8px;
    font-size: 11px;
  }
  .explorer-nav .nav-sep {
    height: 14px;
  }
}

/* 移动端：弹性布局，子导航 + 内容区 + 底部栏 */
@media (max-width: 767.98px) {
  #explorerApp {
    display: flex;
    flex-direction: column;
    height: 100vh;
  }
  .explorer-container {
    height: auto;
    flex: 1;
    margin-top: 0;
    min-height: 0;
  }
}