:host {
  .folded:not(.unfolded) & {
    > .group-title {
      align-items: center;

      > span {
        opacity: 0;
        transition: opacity 200ms ease;
      }

      &:before {
        content: '';
        display: block;
        position: absolute;
        min-width: 1.6rem;
        border-top: 2px solid;
        opacity: 0.2;
      }
    }
  }
}