hexo-theme-stellar/source/css/_layout/widgets/toc_common.styl

.toc-item
  margin-top: 2px
.toc-child
  margin-top: 2px
.widget-wrapper.toc .widget-body
  margin-top: 0
  ul ul, ul ol
    padding-left: 0
  ol ul, ol ol
    padding-left: 0

  .toc
    padding: 0
    margin: 0
    padding-left: 0.25rem
    .toc-item .toc-link
      padding: 0.5rem
      font-weight: 500
      font-size: $fs-13
      color: var(--text-p1)
    .toc-child .toc-item .toc-link
      padding: 0.25rem 0.5rem 0.25rem 1.3rem
      font-weight: 400
      color: var(--text-p2)
    .toc-child .toc-child .toc-item .toc-link
      padding-left: 2.1rem
      font-size: $fs-12
      color: var(--text-p3)
    .toc-child .toc-child .toc-child .toc-item .toc-link
      padding-left: 2.9rem


.widget-wrapper.toc .toc-item
  color: var(--text-p2)
  font-size: $fs-12
  padding: 0
  list-style: none
  &.active
    background: var(--alpha50)
    border-left-color: @color
  .toc-child .toc-item
    padding: 0
.widget-wrapper.toc a.toc-link
  color: inherit
  display: block
  line-height: 1.2
  border-radius: $border-bar
  position: relative
  trans1 background
  &:before
    content: ''
    position: absolute
    left: -6px
    top: 'calc(50% - %s)' % 6px
    bottom: 'calc(50% - %s)' % 6px
    width: 2px
    border-radius: 2px
    background: var(--text)
    visibility: hidden
  &.active
    background: var(--alpha50)
    &:before
      visibility: visible
  &:hover
    background: var(--alpha100)
  
  
// 始终折叠
.widget-wrapper.toc[collapse='true']
  .toc-item a.toc-link+ol
    display: none
  // 激活上级目录时显示子目录
  .toc a.toc-link.active+ol
    display: block

// 自动折叠
.widget-wrapper.toc[collapse='auto']
  .toc-item a.toc-link+ol
    display: none
  // 激活上级目录时显示子目录
  .toc a.toc-link.active+ol
    display: block
  // 鼠标放上去时显示子目录
  &:hover a.toc-link+ol
    display: block

// 子目录激活时显示
.widget-wrapper.toc[collapse='true'] ol:has(> .toc-item a.active)
  display: block
.widget-wrapper.toc[collapse='auto'] ol:has(> .toc-item a.active)
  display: block