FixIt/assets/css/_partials/_single/_toc.scss

// Common styles for all TOC types
.toc {
  .toc-title {
    font-size: $toc-title-font-size;
    font-weight: bold;
    text-transform: uppercase;
  }

  .toc-content {
    font-size: $toc-content-font-size;

    code {
      @extend %code;
    }

    ul {
      margin: 0;
      text-indent: -0.8em;
      padding-left: 0.8em;
      list-style: none;

      a:first-child::before {
        content: '|';
        font-weight: bolder;
        margin-right: 0.5em;
        position: relative;
        bottom: 2px;
        color: $single-link-color;

        [data-theme='dark'] & {
          color: $single-link-color-dark;
        }
      }

      ul {
        padding-left: 1em;
      }
    }

    ol {
      margin: 0;
      padding-left: 2.25em;

      ol {
        padding-left: 1.25em;
      }

      li:has(> a:hover)::marker {
        color: $single-link-color;

        [data-theme='dark'] & {
          color: $single-link-color-dark;
        }
      }
    }
  }

  ruby {
    background: $code-background-color;

    rt {
      color: $global-font-secondary-color;
    }

    [data-theme='dark'] & {
      background: $code-background-color-dark;

      rt {
        color: $global-font-secondary-color-dark;
      }
    }
  }
}

// Common active state styles for auto and dialog TOC
#toc-auto,
#toc-dialog {
  .toc-content {
    li.has-active {
      &::marker {
        color: $single-link-color;

        [data-theme='dark'] & {
          color: $single-link-color-dark;
        }
      }

      &:has(> .active)::marker {
        font-weight: bold;
      }

      > a {
        color: $single-link-color;

        [data-theme='dark'] & {
          color: $single-link-color-dark;
        }
      }
    }

    ul {
      a.active::before {
        color: $single-link-hover-color;

        [data-theme='dark'] & {
          color: $single-link-hover-color-dark;
        }
      }
    }

    a.active {
      font-weight: bold;
    }
  }
}

#toc-auto {
  display: block;
  position: sticky;
  top: calc(#{$header-height} + var(#{$rootPrefix}breadcrumb-height));
  box-sizing: border-box;
  visibility: hidden;
  @include overflow-wrap(break-word);
  @include blur;
  @extend .print-d-none;

  [data-header-desktop='normal'] & {
    #{$rootPrefix}scroll-mt: #{$global-scroll-margin-top};
  }

  .toc-title {
    margin-block: 0 0.5em;
    cursor: pointer;
    @include user-select(none);

    &::before {
      content: '|';
      font-weight: bolder;
      margin-right: 0.5em;
      position: relative;
      bottom: 2px;
      color: $global-border-color;

      [data-theme='dark'] & {
        color: $global-border-color-dark;
      }
    }

    i.toc-icon {
      @include transition(transform 0.2s ease);
    }
  }

  &.toc-hidden i.toc-icon {
    @include transform(rotate(-90deg));
    @include transition(transform 0.2s ease);
  }

  .toc-content {
    overflow-y: scroll;
    // TODO 这里计算错误，待重构
    max-height: calc(100vh - #{2 * $header-height});
    @include scrollbar-width(none, 0);

    &.always-active ul,
    &.always-active ol {
      display: block;
    }

    // for unordered list automatically collapsed
    ul {
      ul {
        display: none;
      }

      .has-active > ul {
        display: block;
      }
    }

    // for ordered list automatically collapsed
    ol {
      ol {
        display: none;
      }

      .has-active > ol {
        display: block;
      }
    }
  }
}

#toc-static {
  display: none;
  margin: 0.8em 0;

  &[data-kept='true'] {
    display: block;
  }

  .toc-title {
    display: flex;
    justify-content: space-between;
    line-height: 2em;
    padding: 0 0.75em;
    background: darken($code-background-color, 3%);

    [data-theme='dark'] & {
      background: darken($code-background-color-dark, 6%);
    }
  }

  .toc-content {
    background-color: $code-background-color;

    > nav {
      > ul {
        padding: 0.4em 1em 0.4em 1.8em;

        a:hover {
          font-weight: bold;

          &::before {
            color: $single-link-hover-color;

            [data-theme='dark'] & {
              color: $single-link-hover-color-dark;
            }
          }
        }
      }

      > ol {
        padding: 0.4em 1em 0.4em 2.25em;

        li:has(> a:hover)::marker,
        a:hover {
          font-weight: bold;
        }
      }
    }

    [data-theme='dark'] & {
      background-color: $code-background-color-dark;
    }
  }

  &.open {
    .toc-title {
      background: darken($code-background-color, 6%);

      [data-theme='dark'] & {
        background: darken($code-background-color-dark, 3%);
      }
    }
  }
}

#toc-dialog {
  transition:
    display 0.2s allow-discrete,
    overlay 0.2s allow-discrete,
    translate 0.2s,
    opacity 0.2s 0.4s;
  opacity: 0;
  translate: 100vw 0;
  width: MIN(100%, 500px);
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  margin-right: 0;
  border: none;

  .toc {
    max-width: 100%;
    margin-inline: 1rem 5rem;

    .toc-title {
      font-size: $toc-title-font-size * 1.5;
      line-height: $toc-title-font-size * 2;
      margin-block: $toc-title-font-size;
    }

    .toc-content {
      font-size: max($toc-content-font-size, 1rem);

      nav {
        max-height: calc(100vh - 5rem);
        overflow: auto;
      }
    }
  }

  &::backdrop {
    transition:
      display 0.5s allow-discrete,
      overlay 0.5s allow-discrete,
      opacity 0.2s 0.4s;
    opacity: 0;
  }

  &[open],
  &[open]::backdrop {
    opacity: 1;
    transition:
      display 0.2s allow-discrete,
      overlay 0.2s allow-discrete,
      translate 0.2s,
      opacity 0.2s;
  }

  &[open] {
    translate: 4rem 0;
  }

  @starting-style {
    &[open],
    &[open]::backdrop {
      opacity: 0;
    }

    &[open] {
      translate: 100vw 0;
    }
  }
}

html:has(#toc-dialog[open]) {
  overflow: hidden;
}