discourse/plugins/chat/assets/stylesheets/common/chat-message-thread-indicator.scss

.chat-message {
  container-type: inline-size;
}

.chat-message-thread-indicator {
  cursor: pointer;
  grid-area: threadindicator;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  background-color: var(--primary-very-low);
  margin: 4px 0 -2px calc(var(--message-left-width) - 0.25rem);
  padding: 0.5rem;
  border-radius: var(--d-border-radius-large);
  color: var(--primary);

  > * {
    pointer-events: none;
  }

  &:visited,
  &:hover {
    color: var(--primary);
  }

  &:hover {
    .chat-message-thread-indicator__replies-count {
      text-decoration: underline;
    }
  }

  .touch & {
    &.-active {
      box-shadow: var(--shadow-dropdown);
    }
  }

  .no-touch & {
    &:hover {
      box-shadow: var(--shadow-dropdown);
    }
  }

  &__last-reply-avatar {
    grid-area: avatar;
    margin-right: 0.5rem;

    .chat-user-avatar {
      width: auto !important;
    }
  }

  &__last-reply-username {
    @include ellipsis;
    font-weight: bold;
    color: var(--primary-very-high);
  }

  &__last-reply-info {
    grid-area: info;
    display: flex;
    align-items: center;
    gap: 0.25rem;
  }

  &__last-reply-timestamp {
    color: var(--primary-high);
    font-size: var(--font-down-3);
  }

  &__last-reply-excerpt {
    @include ellipsis;
    grid-area: excerpt;
  }

  .chat-thread-participants {
    grid-area: participants;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.25rem;
  }

  &__replies-count {
    @include ellipsis;
    color: var(--tertiary);
    font-size: var(--font-down-1);
    text-align: right;
  }
}