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

// Collection Navigation
.collection-card {
  font-size: 0.875rem;
  background-color: darken($global-background-color, 3%);
  margin-top: 0.5rem;
  padding: 1rem 1.25rem;
  position: relative;
  @include border-radius($global-border-radius * 1.5);
  @include user-select(none);

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

  &:has(.collection-nav-item:nth-child(2))::before {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0.75rem;
    width: 1px;
    height: 2rem;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.03), rgba(0, 0, 0, 0.05) 50%, rgba(0, 0, 0, 0.03) 100%);

    [data-theme='dark'] & {
      background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0.03),
        rgba(255, 255, 255, 0.05) 50%,
        rgba(255, 255, 255, 0.03) 100%
      );
    }
  }

  .collection-title {
    @include link(false, false);
  }

  .collection-nav {
    display: flex;
    justify-content: space-between;
    gap: 1rem;

    &:not(:empty) {
      margin-top: 0.5rem;
    }

    .collection-nav-item {
      flex-grow: 1;
      max-width: calc(50% - 0.5rem);
      font-weight: 500;
      display: flex;
      align-items: center;
      @include transition(all 0.3s ease-out);

      &:only-child {
        max-width: 100%;
      }

      i {
        flex-shrink: 0;
      }

      span {
        flex-grow: 1;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
      }

      &[rel='next'] {
        text-align: right;
      }

      &[rel='prev']:hover {
        @include transform(translateX(-4px));
      }

      &[rel='next']:hover {
        @include transform(translateX(4px));
      }
    }
  }
}

// Collection List
.collection-details {

  &:not(:last-of-type) {
    margin-bottom: 0.5rem;
  }

  &.open {
    .collection-summary {
      background-color: darken($global-background-color, 4%);

      [data-theme='dark'] & {
        background-color: lighten($global-background-color-dark, 4%);
      }
    }
  }

  .collection-summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.2rem 0.5rem;
    background-color: darken($global-background-color, 3%);

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

    .details-icon {
      flex-shrink: 0;
    }

    .collection-name {
      font-weight: bold;
    }

    @include user-select(none);
  }

  .collection-content {
    font-size: $toc-content-font-size;
    background-color: darken($global-background-color, 2%);

    [data-theme='dark'] & {
      background-color: lighten($global-background-color-dark, 2%);
    }

    .collection-list {
      margin: 0;
      padding-inline: 1.6rem 0.8rem;
      padding-block: 0.4rem;
      text-indent: -0.8rem;
      list-style: none;
      overflow-y: scroll;
      max-height: 60vh;

      &::-webkit-scrollbar {
        width: 0;
      }

      .collection-item > a::before,
      .collection-item > span::before {
        content: '|';
        font-weight: 600;
        margin-right: 0.5rem;
        position: relative;
        bottom: 2px;
        color: $single-link-color;

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

      .collection-item > .active {
        font-weight: bold;
        color: $single-link-color;

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

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

    .collection-nav-simple {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background-color: darken($global-background-color, 3%);

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

      > i.collection-nav-item {
        cursor: not-allowed;
      }
    }
  }
}