.category-tree-widget {
  background: var(--card-bg, #fff);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}

/* 头部样式优化 */
.ct-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--hr-border, #f0f0f0);
  background: var(--card-bg, #fff);
  transition: padding 0.3s;
}

.ct-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: bold;
  color: var(--font-color, #4c4948);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ct-title i {
  color: var(--main, #49b1f5);
  font-size: 16px;
}

/* 操作按钮优化 */
.ct-actions {
  display: flex;
  gap: 6px;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.category-tree-widget:hover .ct-actions {
  opacity: 1;
}

.ct-actions button,
.ct-close-fullwidth {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--font-color, #999);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.ct-actions button:hover,
.ct-close-fullwidth:hover {
  color: var(--main, #49b1f5);
  background: rgba(73, 177, 245, 0.1);
  transform: scale(1.1);
}

/* 列表区域 */
.ct-root {
  list-style: none;
  margin: 0;
  padding: 8px 0;
  max-height: 400px;
  overflow-y: auto;
  position: relative;
}

/* 滚动条美化 */
.ct-root::-webkit-scrollbar {
  width: 4px;
}

.ct-root::-webkit-scrollbar-track {
  background: transparent;
}

.ct-root::-webkit-scrollbar-thumb {
  background: #e0e0e0;
  border-radius: 2px;
}

.ct-root::-webkit-scrollbar-thumb:hover {
  background: var(--main, #49b1f5);
}

/* 列表项样式 */
.ct-item {
  list-style: none;
  position: relative;
}

.ct-item-inner {
  display: flex;
  align-items: center;
  padding: 5px 12px;
  transition: all 0.2s;
  cursor: pointer;
  position: relative;
  margin: 1px 0;
  border-radius: 4px;
  margin: 0 4px;
}

.ct-item-inner:hover {
  background: rgba(73, 177, 245, 0.08);
}

/* 展开箭头 */
.ct-toggle {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #999;
  flex-shrink: 0;
  margin-right: 2px;
  transition: color 0.2s;
  z-index: 2;
}

.ct-item-inner:hover .ct-toggle {
  color: var(--main, #49b1f5);
}

.ct-toggle i {
  font-size: 10px;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.ct-item.has-children.expanded > .ct-item-inner > .ct-toggle i {
  transform: rotate(90deg);
  color: var(--main, #49b1f5);
}

.ct-toggle.ct-leaf {
  color: transparent;
  pointer-events: none;
}

/* 链接样式 */
.ct-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  min-width: 0;
  text-decoration: none;
  color: var(--font-color, #555);
  font-size: 14px;
  padding: 2px 0;
  transition: color 0.2s;
}

.ct-item-inner:hover .ct-link {
  color: var(--main, #49b1f5);
}

.ct-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.5;
}

/* 数量标签 */
.ct-count {
  font-size: 12px;
  color: #bbb;
  background: rgba(0,0,0,0.03);
  padding: 0 6px;
  border-radius: 8px;
  margin-left: 8px;
  flex-shrink: 0;
  min-width: 20px;
  text-align: center;
  transition: all 0.2s;
}

.ct-item-inner:hover .ct-count {
  color: var(--main, #49b1f5);
  background: rgba(73, 177, 245, 0.1);
}

/* 子菜单容器 */
.ct-children {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

.ct-item.expanded > .ct-children {
  max-height: 2000px;
  opacity: 1;
}

/* --- 树形连接线 (Tree Guides) --- */
.ct-children .ct-item {
  position: relative;
}

/* 垂直线 */
.ct-children .ct-item::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0; /* 这里的 left 会根据层级动态调整，但在 CSS 中很难动态计算，所以我们用伪元素在 item-inner 上做文章 */
  width: 1px;
  background: transparent; /* 默认不显示，我们在 item-inner 里画线 */
}

/* 更好的连接线实现方式：在 ct-item-inner 上画辅助线 */
.ct-children .ct-item-inner::before {
  content: '';
  position: absolute;
  left: -9px; /* 相对于 padding-left 的偏移 */
  top: -8px; /* 向上延伸到父级 */
  bottom: 50%; /* 延伸到当前项的一半高度 */
  width: 1px;
  background-color: transparent;
  border-left: 1px dashed #e0e0e0;
  z-index: 1;
}

/* 只有当不是第一层时才显示连接线 */
.ct-item[data-level="1"] > .ct-item-inner::before,
.ct-item[data-level="2"] > .ct-item-inner::before,
.ct-item[data-level="3"] > .ct-item-inner::before,
.ct-item[data-level="4"] > .ct-item-inner::before,
.ct-item[data-level="5"] > .ct-item-inner::before {
  display: block;
}

.ct-item[data-level="0"] > .ct-item-inner::before {
  display: none;
}

/* 修复最后一项的连接线 */
.ct-item:last-child > .ct-item-inner::before {
  bottom: 50%;
  border-left: 1px dashed #e0e0e0;
  height: auto;
}

/* 全屏遮罩 - 恢复高斯模糊，增加质感 */
.ct-fullwidth-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: 2147483000;
  opacity: 0;
  animation: fadeIn 0.3s forwards;
  pointer-events: auto;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

/* 全屏模式窗口 */
.category-tree-widget.fullwidth-mode {
  position: fixed !important;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%) scale(0.95) !important;
  width: 85vw !important;
  max-width: 900px !important;
  max-height: 85vh !important;
  z-index: 2147483001 !important;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25) !important;
  border-radius: 12px !important;
  opacity: 0;
  animation: popIn 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
  border: 1px solid rgba(0,0,0,0.05);
  
  /* 关键修复：设置不透明背景，防止内容穿透 */
  background-color: #ffffff !important; 
  pointer-events: auto;
}

/* 全屏模式下隐藏其他可能干扰的元素 */
body.ct-modal-open #rightside,
body.ct-modal-open #chatra, 
body.ct-modal-open .tidio-chat-widget,
body.ct-modal-open #gitter-chat-embed,
body.ct-modal-open .gitter-chat-embed {
  display: none !important;
  z-index: -1 !important;
}

@keyframes popIn {
  to { 
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.category-tree-widget.fullwidth-mode .ct-root {
  max-height: calc(85vh - 70px);
  padding: 15px 20px;
}

.category-tree-widget.fullwidth-mode .ct-header {
  padding: 16px 24px;
  background: #f9f9f9;
  border-bottom: 1px solid #eee;
}

.category-tree-widget.fullwidth-mode .ct-title {
  font-size: 18px;
}

.category-tree-widget.fullwidth-mode .ct-item-inner {
  padding: 8px 16px;
  margin: 2px 0;
}

.category-tree-widget.fullwidth-mode .ct-name {
  font-size: 15px;
}

/* --- 暗色模式适配 --- */
[data-theme="dark"] .category-tree-widget {
  background: var(--card-bg, #1d1e22);
  border: 1px solid #2c2d31;
}

[data-theme="dark"] .ct-header {
  border-bottom-color: #2c2d31;
  background: #1d1e22;
}

[data-theme="dark"] .ct-title {
  color: #a0a0a0;
}

[data-theme="dark"] .ct-link {
  color: #a0a0a0;
}

[data-theme="dark"] .ct-item-inner:hover {
  background: rgba(73, 177, 245, 0.15);
}

[data-theme="dark"] .ct-item-inner:hover .ct-link {
  color: #fff;
}

[data-theme="dark"] .ct-count {
  background: rgba(255,255,255,0.05);
  color: #777;
}

[data-theme="dark"] .ct-root::-webkit-scrollbar-thumb {
  background: #444;
}

[data-theme="dark"] .ct-children .ct-item-inner::before {
  border-left-color: #444;
}

[data-theme="dark"] .ct-fullwidth-overlay {
  background: rgba(0, 0, 0, 0.7);
}

[data-theme="dark"] .category-tree-widget.fullwidth-mode {
  border: 1px solid #333;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.5) !important;
  background-color: #1d1e22 !important; /* 确保暗色模式下也是不透明背景 */
}

[data-theme="dark"] .category-tree-widget.fullwidth-mode .ct-header {
  background: #25262a;
}

/* ============================================
   分类页树形展示样式 (Category Page Tree)
   ============================================ */

.category-page-tree {
  margin-bottom: 30px;
}

.cpt-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0 10px 14px;
  font-size: 13px;
  color: var(--font-color, #4c4948);
}

.cpt-breadcrumb-link {
  color: var(--main, #49b1f5);
  text-decoration: none;
  transition: color 0.2s ease;
}

.cpt-breadcrumb-link:hover {
  color: var(--main, #49b1f5);
  text-decoration: underline;
}

.cpt-breadcrumb-sep {
  color: #bbb;
}

.cpt-breadcrumb-current {
  color: var(--font-color, #4c4948);
  font-weight: 600;
}

.cpt-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 20px;
  padding: 0 10px;
}

.cpt-actions {
  display: flex;
  gap: 10px;
}

.cpt-actions button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: 20px;
  background: var(--card-bg, #fff);
  color: var(--font-color, #4c4948);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.cpt-actions button:hover {
  background: var(--main, #49b1f5);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(73, 177, 245, 0.3);
}

.cpt-actions button i {
  font-size: 12px;
}

.cpt-tree-content {
  background: var(--card-bg, #fff);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.cpt-direct-posts {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--hr-border, #eee);
}

.cpt-direct-posts-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--font-color, #4c4948);
}

.cpt-direct-posts-header i {
  color: var(--main, #49b1f5);
}

.cpt-category-section {
  margin-bottom: 8px;
  border-radius: 8px;
  overflow: hidden;
}

.cpt-category-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(73, 177, 245, 0.05);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.25s ease;
  user-select: none;
}

.cpt-category-header:hover {
  background: rgba(73, 177, 245, 0.12);
}

.cpt-category-header .cpt-toggle {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--main, #49b1f5);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.cpt-category-header .cpt-toggle i {
  font-size: 12px;
}

.cpt-category-header[data-expanded="false"] .cpt-toggle {
  transform: rotate(-90deg);
}

.cpt-category-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--font-color, #4c4948);
  font-weight: 600;
  font-size: 15px;
  flex: 1;
  transition: color 0.2s;
}

.cpt-category-link:hover {
  color: var(--main, #49b1f5);
}

.cpt-category-link i {
  color: var(--main, #49b1f5);
  font-size: 16px;
}

.cpt-category-name {
  flex: 1;
}

.cpt-category-count {
  font-size: 12px;
  font-weight: normal;
  color: #999;
  background: rgba(0, 0, 0, 0.05);
  padding: 2px 10px;
  border-radius: 12px;
  min-width: 24px;
  text-align: center;
}

.cpt-category-content {
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), 
              opacity 0.3s ease,
              padding 0.3s ease;
  max-height: 2000px;
  opacity: 1;
  padding: 8px 0 8px 20px;
}

.cpt-category-header[data-expanded="false"] + .cpt-category-content {
  max-height: 0;
  opacity: 0;
  padding: 0 0 0 20px;
}

.cpt-posts-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 0;
}

.cpt-post-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--font-color, #555);
  border-radius: 8px;
  transition: all 0.2s ease;
  position: relative;
}

.cpt-post-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--main, #49b1f5);
  border-radius: 2px;
  transition: height 0.2s ease;
}

.cpt-post-item:hover {
  background: rgba(73, 177, 245, 0.08);
}

.cpt-post-item:hover::before {
  height: 60%;
}

.cpt-post-item:hover .cpt-post-title {
  color: var(--main, #49b1f5);
}

.cpt-post-date {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #999;
  flex-shrink: 0;
  min-width: 110px;
}

.cpt-post-date i {
  font-size: 12px;
}

.cpt-post-title {
  flex: 1;
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.2s;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cpt-subcategories {
  margin-top: 8px;
  padding-left: 16px;
  border-left: 2px solid rgba(73, 177, 245, 0.2);
}

/* 暗色模式适配 */
[data-theme="dark"] .cpt-breadcrumb {
  color: #a0a0a0;
}

[data-theme="dark"] .cpt-breadcrumb-link {
  color: var(--main, #49b1f5);
}

[data-theme="dark"] .cpt-breadcrumb-sep {
  color: #666;
}

[data-theme="dark"] .cpt-breadcrumb-current {
  color: #c0c0c0;
}

[data-theme="dark"] .cpt-actions button {
  background: var(--card-bg, #1d1e22);
  color: #a0a0a0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .cpt-actions button:hover {
  background: var(--main, #49b1f5);
  color: #fff;
}

[data-theme="dark"] .cpt-tree-content {
  background: var(--card-bg, #1d1e22);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .cpt-direct-posts {
  border-bottom-color: #333;
}

[data-theme="dark"] .cpt-direct-posts-header {
  color: #a0a0a0;
}

[data-theme="dark"] .cpt-category-header {
  background: rgba(73, 177, 245, 0.1);
}

[data-theme="dark"] .cpt-category-header:hover {
  background: rgba(73, 177, 245, 0.18);
}

[data-theme="dark"] .cpt-category-link {
  color: #c0c0c0;
}

[data-theme="dark"] .cpt-category-count {
  background: rgba(255, 255, 255, 0.08);
  color: #888;
}

[data-theme="dark"] .cpt-post-item {
  color: #a0a0a0;
}

[data-theme="dark"] .cpt-post-item:hover {
  background: rgba(73, 177, 245, 0.12);
}

[data-theme="dark"] .cpt-post-date {
  color: #666;
}

[data-theme="dark"] .cpt-subcategories {
  border-left-color: rgba(73, 177, 245, 0.3);
}

/* 响应式适配 */
@media screen and (max-width: 768px) {
  .cpt-header {
    justify-content: center;
  }
  
  .cpt-actions button span {
    display: none;
  }
  
  .cpt-actions button {
    padding: 10px;
    border-radius: 50%;
  }
  
  .cpt-tree-content {
    padding: 15px;
  }
  
  .cpt-category-header {
    padding: 10px 12px;
  }
  
  .cpt-post-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 12px;
  }
  
  .cpt-post-date {
    min-width: auto;
    font-size: 12px;
  }
  
  .cpt-post-title {
    white-space: normal;
  }
  
  .cpt-subcategories {
    padding-left: 12px;
  }
}

/* ============================================
   文章悬浮预览样式 (Post Preview Tooltip)
   ============================================ */

.cpt-preview-tooltip {
  position: fixed;
  z-index: 9999;
  width: 320px;
  max-width: 90vw;
  background: var(--card-bg, #fff);
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px rgba(0, 0, 0, 0.05);
  padding: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px) scale(0.98);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  pointer-events: none;
  overflow: hidden;
}

.cpt-preview-tooltip.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.cpt-preview-cover {
  width: 100%;
  height: 120px;
  object-fit: cover;
  display: block;
}

.cpt-preview-no-cover {
  width: 100%;
  height: 80px;
  background: linear-gradient(135deg, var(--main, #49b1f5) 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cpt-preview-no-cover i {
  font-size: 32px;
  color: rgba(255, 255, 255, 0.8);
}

.cpt-preview-content {
  padding: 16px;
}

.cpt-preview-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--font-color, #333);
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.cpt-preview-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: #999;
  margin-bottom: 10px;
}

.cpt-preview-meta i {
  margin-right: 4px;
}

.cpt-preview-description {
  font-size: 13px;
  color: #666;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.cpt-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cpt-preview-tag {
  font-size: 11px;
  padding: 3px 8px;
  background: rgba(73, 177, 245, 0.1);
  color: var(--main, #49b1f5);
  border-radius: 12px;
  white-space: nowrap;
}

.cpt-preview-footer {
  padding: 10px 16px;
  background: rgba(0, 0, 0, 0.02);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  font-size: 12px;
  color: #999;
  display: flex;
  align-items: center;
  gap: 6px;
}

.cpt-preview-footer i {
  color: var(--main, #49b1f5);
}

/* 暗色模式适配 */
[data-theme="dark"] .cpt-preview-tooltip {
  background: var(--card-bg, #1d1e22);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .cpt-preview-title {
  color: #e0e0e0;
}

[data-theme="dark"] .cpt-preview-meta {
  color: #777;
}

[data-theme="dark"] .cpt-preview-description {
  color: #999;
}

[data-theme="dark"] .cpt-preview-tag {
  background: rgba(73, 177, 245, 0.15);
}

[data-theme="dark"] .cpt-preview-footer {
  background: rgba(255, 255, 255, 0.02);
  border-top-color: rgba(255, 255, 255, 0.05);
  color: #666;
}

/* 移动端不显示悬浮预览 */
@media screen and (max-width: 768px) {
  .cpt-preview-tooltip {
    display: none !important;
  }
}