/* ═══════════════════════════════════════════════════════════════
   Alpha-0 Batch 1 — 盒子管理器 + 卡片编辑器 样式
   追加到 style.css 末尾
   设计令牌: 沿用全局 --c-bg / --c-accent / --c-danger 等
   ═══════════════════════════════════════════════════════════════ */

/* ─── 盒子管理器 (.bm-*) ─── */

.bm-root {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--c-bg, #fff);
  color: var(--c-text, #1a1a1a);
  font-size: 13px;
  overflow: hidden;
}

/* 布局: 左栏 + 右栏 */
.bm-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── 左栏: 盒子列表 ── */
.bm-sidebar {
  width: 200px;
  min-width: 160px;
  border-right: 1px solid var(--c-border, #e5e5e5);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.bm-sidebar-header {
  padding: 8px 12px;
  border-bottom: 1px solid var(--c-border, #e5e5e5);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bm-sidebar-title {
  font-weight: 600;
  font-size: 12px;
  color: var(--c-text-muted, #888);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.bm-btn-new-box {
  width: 24px;
  height: 24px;
  border: none;
  background: var(--c-accent, #2563eb);
  color: #fff;
  border-radius: var(--r-sm, 6px);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.15s;
}
.bm-btn-new-box:hover { opacity: 0.85; }

.bm-box-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

/* 盒子列表项 — 扁平无层级 */
.bm-box-item {
  padding: 6px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.1s;
  border-left: 3px solid transparent;
}
.bm-box-item:hover {
  background: var(--c-bg-hover, #f5f5f5);
}
.bm-box-item.active {
  background: var(--c-bg-active, #eff6ff);
  border-left-color: var(--c-accent, #2563eb);
}

.bm-box-icon {
  font-size: 14px;
  flex-shrink: 0;
}

.bm-box-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}

.bm-box-count {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  flex-shrink: 0;
}

/* 拖拽悬停态 */
.bm-box-item.drop-target {
  background: var(--c-bg-active, #eff6ff);
  border-left-color: var(--c-accent, #2563eb);
  outline: 2px dashed var(--c-accent, #2563eb);
  outline-offset: -2px;
}

/* ── 右栏: 主内容区 ── */
.bm-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* 盒子信息区 */
.bm-box-info {
  padding: 12px 16px;
  border-bottom: 1px solid var(--c-border, #e5e5e5);
}

.bm-box-info-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.bm-box-info-name {
  font-size: 16px;
  font-weight: 600;
  flex: 1;
  border: 1px solid transparent;
  padding: 2px 6px;
  border-radius: var(--r-sm, 6px);
  outline: none;
  background: transparent;
  transition: border-color 0.15s;
}
.bm-box-info-name:hover {
  border-color: var(--c-border, #e5e5e5);
}
.bm-box-info-name:focus {
  border-color: var(--c-accent, #2563eb);
  background: #fff;
}

.bm-box-info-desc {
  font-size: 12px;
  color: var(--c-text-muted, #888);
  border: 1px solid transparent;
  padding: 2px 6px;
  border-radius: var(--r-sm, 6px);
  outline: none;
  background: transparent;
  width: 100%;
  resize: none;
  transition: border-color 0.15s;
}
.bm-box-info-desc:hover {
  border-color: var(--c-border, #e5e5e5);
}
.bm-box-info-desc:focus {
  border-color: var(--c-accent, #2563eb);
  background: #fff;
}

.bm-box-info-meta {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  margin-top: 4px;
}

/* ── Tab 栏 ── */
.bm-tab-bar {
  display: flex;
  border-bottom: 1px solid var(--c-border, #e5e5e5);
  padding: 0 16px;
  gap: 0;
}

.bm-tab {
  padding: 8px 16px;
  cursor: pointer;
  font-size: 12px;
  color: var(--c-text-muted, #888);
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  user-select: none;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  border-radius: 0;
  outline: none;
  margin-bottom: -1px;
}
.bm-tab:hover {
  color: var(--c-text, #1a1a1a);
}
.bm-tab.active {
  color: var(--c-accent, #2563eb);
  border-bottom-color: var(--c-accent, #2563eb);
  font-weight: 500;
}

.bm-tab-badge {
  display: inline-block;
  background: var(--c-bg-hover, #f5f5f5);
  color: var(--c-text-muted, #888);
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 8px;
  margin-left: 4px;
}
.bm-tab.active .bm-tab-badge {
  background: var(--c-accent, #2563eb);
  color: #fff;
}

/* ── 内容面板 ── */
.bm-content-panel {
  flex: 1;
  overflow-y: auto;
  padding: 8px 16px;
}

/* 工具栏 */
.bm-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.bm-search-input {
  flex: 1;
  height: 28px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  padding: 0 8px;
  font-size: 12px;
  outline: none;
  transition: border-color 0.15s;
}
.bm-search-input:focus {
  border-color: var(--c-accent, #2563eb);
}

.bm-view-toggle {
  display: flex;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  overflow: hidden;
}

.bm-view-btn {
  padding: 4px 8px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 12px;
  color: var(--c-text-muted, #888);
  transition: background 0.1s, color 0.1s;
}
.bm-view-btn:hover { background: var(--c-bg-hover, #f5f5f5); }
.bm-view-btn.active {
  background: var(--c-accent, #2563eb);
  color: #fff;
}

.bm-btn-add-ref {
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  background: #fff;
  cursor: pointer;
  font-size: 12px;
  color: var(--c-text, #1a1a1a);
  transition: border-color 0.15s, background 0.15s;
}
.bm-btn-add-ref:hover {
  border-color: var(--c-accent, #2563eb);
  background: var(--c-bg-active, #eff6ff);
}

/* ── 卡片网格视图 ── */
.bm-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}

.bm-card-thumb {
  background: #fff;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  padding: 10px;
  cursor: pointer;
  transition: box-shadow 0.15s, border-color 0.15s;
  position: relative;
}
.bm-card-thumb:hover {
  border-color: var(--c-accent, #2563eb);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.08));
}

.bm-card-thumb.dragging {
  opacity: 0.4;
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.12));
}

.bm-card-type-badge {
  display: inline-block;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--c-bg-hover, #f5f5f5);
  color: var(--c-text-muted, #888);
  margin-bottom: 4px;
}

.bm-card-thumb-title {
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bm-card-thumb-preview {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-height: 1.4;
  min-height: 28px;
}

.bm-card-thumb-tags {
  display: flex;
  gap: 3px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.bm-card-mini-tag {
  font-size: 9px;
  padding: 0 4px;
  border-radius: 3px;
  background: var(--c-bg-hover, #f5f5f5);
  color: var(--c-text-muted, #888);
}

/* ── 卡片列表视图 ── */
.bm-cards-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.bm-card-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--r-sm, 6px);
  cursor: pointer;
  transition: background 0.1s;
}
.bm-card-row:hover {
  background: var(--c-bg-hover, #f5f5f5);
}

.bm-card-row.dragging {
  opacity: 0.4;
}

.bm-card-row-type {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  width: 40px;
  flex-shrink: 0;
}

.bm-card-row-title {
  flex: 1;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bm-card-row-media {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  width: 40px;
  flex-shrink: 0;
  text-align: right;
}

.bm-card-row-order {
  font-size: 10px;
  color: var(--c-text-muted, #888);
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

/* 拖拽排序指示器 */
.bm-drop-indicator {
  height: 2px;
  background: var(--c-accent, #2563eb);
  margin: 0 8px;
  border-radius: 1px;
  transition: opacity 0.1s;
}

/* ── 关联关系 Tab ── */
.bm-ref-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bm-ref-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  background: #fff;
}

.bm-ref-type-badge {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  flex-shrink: 0;
}
.bm-ref-type-badge.embed {
  background: #dbeafe;
  color: #1d4ed8;
}
.bm-ref-type-badge.shortcut {
  background: #fef3c7;
  color: #92400e;
}

.bm-ref-target-name {
  flex: 1;
  font-size: 13px;
  cursor: pointer;
}
.bm-ref-target-name:hover {
  color: var(--c-accent, #2563eb);
  text-decoration: underline;
}

.bm-ref-remove {
  width: 20px;
  height: 20px;
  border: none;
  background: transparent;
  color: var(--c-text-muted, #888);
  cursor: pointer;
  border-radius: 50%;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, color 0.1s;
}
.bm-ref-remove:hover {
  background: #fee2e2;
  color: var(--c-danger, #ef4444);
}

/* ── 独立卡片 Tab ── */
.bm-orphan-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.bm-orphan-title {
  font-size: 13px;
  font-weight: 500;
}

.bm-orphan-hint {
  font-size: 11px;
  color: var(--c-text-muted, #888);
}

.bm-orphan-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
}

.bm-orphan-card {
  background: #fff;
  border: 1px dashed var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  padding: 8px;
  cursor: grab;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.bm-orphan-card:hover {
  border-color: var(--c-accent, #2563eb);
  border-style: solid;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.08));
}

.bm-orphan-card.dragging {
  opacity: 0.4;
  cursor: grabbing;
}

/* ── 盒子右键菜单 ── */
.bm-context-menu {
  position: fixed;
  z-index: 10000;
  background: #fff;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  box-shadow: var(--shadow-lg, 0 8px 24px rgba(0,0,0,0.12));
  padding: 4px 0;
  min-width: 140px;
}

.bm-context-menu-item {
  padding: 6px 14px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.1s;
}
.bm-context-menu-item:hover {
  background: var(--c-bg-hover, #f5f5f5);
}
.bm-context-menu-item.danger {
  color: var(--c-danger, #ef4444);
}
.bm-context-menu-item.danger:hover {
  background: #fee2e2;
}

.bm-context-menu-sep {
  height: 1px;
  background: var(--c-border, #e5e5e5);
  margin: 4px 0;
}

/* ── 添加关联对话框 ── */
.bm-dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bm-dialog {
  background: #fff;
  border-radius: 8px;
  box-shadow: var(--shadow-lg, 0 8px 24px rgba(0,0,0,0.12));
  width: 360px;
  max-height: 400px;
  display: flex;
  flex-direction: column;
}

.bm-dialog-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--c-border, #e5e5e5);
  font-weight: 600;
  font-size: 14px;
}

.bm-dialog-body {
  padding: 12px 16px;
  flex: 1;
  overflow-y: auto;
}

.bm-dialog-search {
  width: 100%;
  height: 30px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  padding: 0 8px;
  font-size: 12px;
  outline: none;
  margin-bottom: 8px;
}
.bm-dialog-search:focus {
  border-color: var(--c-accent, #2563eb);
}

.bm-dialog-ref-type-toggle {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

.bm-dialog-ref-type-btn {
  flex: 1;
  padding: 6px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  background: #fff;
  cursor: pointer;
  font-size: 12px;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}
.bm-dialog-ref-type-btn.active {
  border-color: var(--c-accent, #2563eb);
  background: var(--c-bg-active, #eff6ff);
  color: var(--c-accent, #2563eb);
  font-weight: 500;
}

.bm-dialog-box-item {
  padding: 6px 8px;
  cursor: pointer;
  border-radius: var(--r-sm, 6px);
  font-size: 13px;
  transition: background 0.1s;
}
.bm-dialog-box-item:hover {
  background: var(--c-bg-hover, #f5f5f5);
}
.bm-dialog-box-item.selected {
  background: var(--c-bg-active, #eff6ff);
  color: var(--c-accent, #2563eb);
}

.bm-dialog-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--c-border, #e5e5e5);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.bm-dialog-btn {
  padding: 6px 14px;
  border-radius: var(--r-sm, 6px);
  font-size: 12px;
  cursor: pointer;
  border: 1px solid var(--c-border, #e5e5e5);
  background: #fff;
  transition: background 0.15s;
}
.bm-dialog-btn:hover { background: var(--c-bg-hover, #f5f5f5); }
.bm-dialog-btn.primary {
  background: var(--c-accent, #2563eb);
  color: #fff;
  border-color: var(--c-accent, #2563eb);
}
.bm-dialog-btn.primary:hover { opacity: 0.9; }
.bm-dialog-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── 底栏 ── */
.bm-footer {
  padding: 6px 16px;
  border-top: 1px solid var(--c-border, #e5e5e5);
  font-size: 11px;
  color: var(--c-text-muted, #888);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── 空状态 ── */
.bm-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  color: var(--c-text-muted, #888);
  font-size: 13px;
  text-align: center;
}
.bm-empty-icon {
  font-size: 32px;
  margin-bottom: 8px;
  opacity: 0.4;
}


/* ═══════════════════════════════════════════════════════════════
   卡片编辑器 (.ce-*)
   ═══════════════════════════════════════════════════════════════ */

.ce-root {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--c-bg, #fff);
  color: var(--c-text, #1a1a1a);
  font-size: 13px;
  overflow: hidden;
}

/* ── 工具栏 ── */
.ce-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 12px;
  border-bottom: 1px solid var(--c-border, #e5e5e5);
  flex-shrink: 0;
}

.ce-tgroup {
  display: flex;
  align-items: center;
  gap: 4px;
}

.ce-tlabel {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  flex-shrink: 0;
}

/* 自定义下拉选择器 */
.ce-select {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px 6px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  cursor: pointer;
  font-size: 12px;
  transition: border-color 0.15s;
  user-select: none;
}
.ce-select:hover {
  border-color: var(--c-accent, #2563eb);
}

.ce-select-val {
  max-width: 60px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ce-select-arrow {
  font-size: 10px;
  color: var(--c-text-muted, #888);
}

.ce-select-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 100;
  min-width: 100%;
  background: #fff;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.12));
  padding: 4px 0;
  margin-top: 2px;
}

.ce-select-opt {
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.1s;
}
.ce-select-opt:hover {
  background: var(--c-bg-hover, #f5f5f5);
}
.ce-select-opt.active {
  color: var(--c-accent, #2563eb);
  font-weight: 500;
}

/* entity_code 显示 */
.ce-code-group {
  margin-left: auto;
}

.ce-code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 11px;
  color: var(--c-text-muted, #888);
  background: var(--c-bg-hover, #f5f5f5);
  padding: 2px 6px;
  border-radius: 4px;
}

/* 保存状态 */
.ce-save-status {
  font-size: 10px;
  transition: color 0.2s;
}

/* ── 拖拽手柄 ── */
.ce-drag-group {
  margin-left: 4px;
}

.ce-drag-handle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 16px;
  color: var(--c-text-muted, #888);
  cursor: grab;
  border-radius: var(--r-sm, 6px);
  transition: background 0.15s, color 0.15s;
  user-select: none;
}
.ce-drag-handle:hover {
  background: var(--c-bg-hover, #f5f5f5);
  color: var(--c-text, #1a1a1a);
}
.ce-drag-handle:active {
  cursor: grabbing;
}
.ce-drag-handle.ce-dragging {
  opacity: 0.4;
}

/* ── 编辑区 ── */
.ce-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.ce-title-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 20px;
  font-weight: 600;
  padding: 0 0 8px 0;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--c-border, #e5e5e5);
  background: transparent;
  color: var(--c-text, #1a1a1a);
}
.ce-title-input::placeholder {
  color: var(--c-text-muted, #888);
}

.ce-content {
  min-height: 200px;
  outline: none;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text, #1a1a1a);
}
.ce-content:empty::before {
  content: attr(data-placeholder);
  color: var(--c-text-muted, #888);
  pointer-events: none;
}

/* ── 标签行 ── */
.ce-tags-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-top: 1px solid var(--c-border, #e5e5e5);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.ce-tags-label {
  font-size: 11px;
  color: var(--c-text-muted, #888);
  flex-shrink: 0;
}

.ce-tags {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.ce-tag {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 1px 6px;
  background: var(--c-bg-hover, #f5f5f5);
  border-radius: 4px;
  font-size: 11px;
  color: var(--c-text, #1a1a1a);
}

.ce-tag-x {
  cursor: pointer;
  font-size: 12px;
  color: var(--c-text-muted, #888);
  line-height: 1;
  transition: color 0.1s;
}
.ce-tag-x:hover {
  color: var(--c-danger, #ef4444);
}

.ce-tag-input {
  border: none;
  outline: none;
  font-size: 11px;
  background: transparent;
  min-width: 80px;
  flex: 1;
  color: var(--c-text, #1a1a1a);
}
.ce-tag-input::placeholder {
  color: var(--c-text-muted, #888);
}

/* ── 底栏 ── */
.ce_footer,
.ce-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  border-top: 1px solid var(--c-border, #e5e5e5);
  flex-shrink: 0;
}

.ce-footer-left {
  font-size: 11px;
  color: var(--c-text-muted, #888);
}

.ce-footer-right {
  display: flex;
  gap: 6px;
}

.ce-fbtn {
  padding: 4px 10px;
  border: 1px solid var(--c-border, #e5e5e5);
  border-radius: var(--r-sm, 6px);
  background: #fff;
  cursor: pointer;
  font-size: 12px;
  color: var(--c-text, #1a1a1a);
  transition: background 0.15s, border-color 0.15s;
}
.ce-fbtn:hover {
  background: var(--c-bg-hover, #f5f5f5);
  border-color: var(--c-border, #d4d4d4);
}

.ce-fbtn-save {
  background: var(--c-accent, #2563eb);
  color: #fff;
  border-color: var(--c-accent, #2563eb);
}
.ce-fbtn-save:hover {
  opacity: 0.9;
  background: var(--c-accent, #2563eb);
}

.ce-fbtn-close {
  color: var(--c-text-muted, #888);
}
.ce-fbtn-close:hover {
  color: var(--c-danger, #ef4444);
  border-color: var(--c-danger, #ef4444);
  background: #fee2e2;
}

/* ═══════════ 拖拽协议：Ghost / 三态反馈 / 动作标签 ═══════════ */

/* Ghost 预览（setDragImage 捕获后移除） */
.drag-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: #fff;
  border: 1px solid var(--c-border, #d4d4d4);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  font-size: 13px;
  color: var(--c-text, #1a1a1a);
  pointer-events: none;
  user-select: none;
}
.drag-ghost-icon {
  font-size: 16px;
  line-height: 1;
}
.drag-ghost-label {
  white-space: nowrap;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Tooltip overlay（跟随鼠标的动作提示） */
.drag-tooltip-overlay {
  position: fixed;
  z-index: 99999;
  padding: 4px 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  border-radius: 4px;
  font-size: 12px;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
  display: none;
}

/* 三态反馈：idle（valid） */
.drag-target-valid {
  outline: 2px dashed #2563eb !important;
  outline-offset: -2px;
  background-color: rgba(37, 99, 235, 0.04) !important;
}

/* 三态反馈：hover（即将放置） */
.drag-target-hover {
  outline: 2px solid #2563eb !important;
  outline-offset: -2px;
  background-color: rgba(37, 99, 235, 0.08) !important;
}

/* 三态反馈：incompatible（不兼容） */
.drag-target-incompatible {
  outline: 2px dashed #aaa !important;
  outline-offset: -2px;
  background-color: rgba(0,0,0,0.02) !important;
  opacity: 0.6;
}

/* 拖拽源：拖拽中半透明 */
.drag-source-dragging {
  opacity: 0.4;
}

/* 动作标签（target 内显示的动作文字） */
.drag-action-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 2px 8px;
  background: rgba(37, 99, 235, 0.9);
  color: #fff;
  border-radius: 4px;
  font-size: 11px;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
  z-index: 10;
}

/* 动作提示（跟随鼠标的浮动标签） */
.drag-action-tooltip {
  position: fixed;
  z-index: 99998;
  padding: 4px 10px;
  background: rgba(37, 99, 235, 0.9);
  color: #fff;
  border-radius: 4px;
  font-size: 12px;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
  display: none;
}