@mixin dot() {
  content: " ";

  position: absolute;
  z-index: 2;

  border: 1px solid var(--dot-border-color);
  border-radius: 50%;

  background: var(--dot-color);

  transition:
    background var(--vp-t-color),
    border-color var(--vp-t-color);
}

.timeline-list-wrapper {
  --dot-color: #fff;
  --dot-bar-color: #eaecef;
  --dot-border-color: #ddd;

  padding: 8px 0;

  [data-theme="dark"] & {
    --dot-color: #444;
    --dot-bar-color: #333;
    --dot-border-color: #555;
  }

  .timeline-list-title {
    cursor: pointer;

    .icon {
      position: relative;
      bottom: -0.125rem;

      width: 16px;
      height: 16px;
      margin: 0 6px;
    }

    .num {
      position: relative;
      margin: 0 2px;
      font-size: 22px;
    }
  }

  .timeline-content {
    overflow-y: auto;
    max-height: 80vh;

    &::-webkit-scrollbar-track-piece {
      background: transparent;
    }
  }

  .timeline-list {
    position: relative;
    box-sizing: border-box;
    margin: 0 8px;
    list-style: none;

    &::after {
      content: " ";

      position: absolute;
      inset-inline-start: 0;
      top: 14px;
      z-index: -1;

      width: 4px;
      height: calc(100% - 14px);
      margin-inline-start: -2px;

      background: var(--dot-bar-color);

      transition: background var(--vp-t-color);
    }
  }

  .timeline-year {
    position: relative;

    margin: 20px 0 0;

    color: var(--vp-c-text);

    font-weight: 700;
    font-size: 20px;

    &::before {
      @include dot;
      inset-inline-start: -20px;
      top: 50%;

      width: 8px;
      height: 8px;
      margin-top: -4px;
      margin-inline-start: -4px;
    }
  }

  .timeline-year-wrapper {
    padding-inline-start: 0 !important;
  }

  .timeline-date {
    display: inline-block;
    vertical-align: bottom;

    width: 36px;

    font-size: 12px;
    line-height: 32px;

    transition: color var(--vp-t-color);

    &::before {
      @include dot;
      inset-inline-start: -19px;
      top: 24px;

      width: 6px;
      height: 6px;
      margin-inline-start: -4px;
    }
  }

  .timeline-title {
    color: inherit;

    font-size: 14px;
    line-height: 32px;

    cursor: pointer;

    transition: color var(--vp-t-color);
  }

  .timeline-item {
    position: relative;

    display: flex;

    padding: 12px 0 4px;
    border-bottom: 1px dashed var(--vp-c-border);

    list-style: none;

    transition: border-color var(--vp-t-color);

    &:hover {
      .timeline-date {
        color: var(--vp-c-accent);

        // stylelint-disable-next-line max-nesting-depth
        &::before {
          border-color: var(--dot-color);
          background: var(--vp-c-accent);
        }
      }

      .timeline-title {
        color: var(--vp-c-accent);
      }
    }
  }
}