discourse/plugins/chat/assets/stylesheets/common/base-common.scss

:root {
  --message-left-width: 42px;
  --full-page-border-radius: 12px;
  --full-page-sidebar-width: 275px;
  --channel-list-avatar-size: 30px;
  --chat-header-offset: 50px;
}

// Very specific hack to ensure the contextual menu (copy/paste/...) is
// not completely over the textarea, the rules to position this menu are quite obscure
// and under DiscourseHUB the space between the textarea and the keyboard is so small that
// it sometimes prefer to appear on top of the textarea, making any gesture very complicated
html.ios-device.keyboard-visible body #main-outlet .full-page-chat {
  padding-bottom: 0.2rem;
}

.uppy-is-drag-over .chat-composer .drop-a-file {
  display: flex;
  position: absolute;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.75);
  z-index: z("header");
  &-content {
    width: max-content;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2em;
    background-color: #1d1d1d;
    border-radius: 0.25em;
    &-images {
      .d-icon {
        height: 3em;
        width: 3em;
        color: var(--secondary-or-primary);
        &:first-of-type {
          transform: rotate(-5deg);
        }
        &:nth-of-type(2) {
          height: 4em;
          width: 4em;
        }
        &:last-of-type {
          transform: rotate(5deg);
        }
      }
    }
    &-text {
      margin: 1.5em 0 0 0;
      font-size: var(--font-up-1);
      color: var(--secondary-or-primary);
      .d-icon-upload {
        padding-right: 0.25em;
        position: relative;
        bottom: 2px;
        color: var(--secondary-or-primary);
      }
    }
  }
}

.header-dropdown-toggle.chat-header-icon {
  .icon {
    .chat-channel-unread-indicator {
      @include chat-unread-indicator;
      border: 2px solid var(--header_background);
      position: absolute;
      top: 0;
      right: 2px;

      &.-urgent {
        display: flex;
        align-items: center;
        justify-content: center;
        width: auto;
        height: 1em;
        min-width: 0.6em;
        padding: 0.21em 0.42em;
        top: -1px;
        right: 0;
      }
    }
  }

  span.icon {
    cursor: auto;

    &:hover {
      .d-icon {
        color: var(--header_primary-low-mid);
      }

      background: none;
    }
  }

  a.icon {
    &.active {
      .d-icon-comment {
        color: var(--primary-medium);
      }
    }

    &:hover {
      .chat-channel-unread-indicator {
        border-color: var(--primary-low);
      }
    }
  }
}

.chat-messages-container {
  word-wrap: break-word;
  white-space: normal;
  position: relative;

  .chat-message-container {
    display: grid;

    &.-selectable {
      grid-template-columns: 1.5em 1fr;
    }

    .chat-message-selector {
      align-self: center;
      justify-self: end;
      margin: 0;
    }
  }

  .chat-time {
    color: var(--primary-high);
    font-size: var(--font-down-2);
  }

  .emoji-picker {
    position: fixed;
  }

  &:hover {
    .chat-.chat-message-react-btn {
      display: inline-block;
    }
  }
}

.chat-emoji-avatar {
  width: var(--message-left-width);
  align-items: center;

  img {
    display: block;
    margin-left: auto;
    margin-right: auto;
  }
}

.avatar {
  border: 1px solid transparent;
  padding: 0;
  box-sizing: border-box;

  .is-online & {
    border: 1px solid var(--secondary);
    box-shadow: 0px 0px 0px 1px var(--success);
  }
}

.topic-title-chat-icon {
  display: inline-block;
  * {
    display: inline-block;
  }
}

body.has-sidebar-page.has-full-page-chat #main-outlet-wrapper {
  gap: 0;
}

body.has-full-page-chat {
  .alert-error,
  .alert-info,
  .alert-success,
  .alert-warning {
    margin: 0;
    border-bottom: 1px solid var(--primary-low);
  }
}

.full-page-chat {
  display: grid;
  grid-template-columns: var(--full-page-sidebar-width) 1fr;
  background: var(--d-content-background);

  .chat-full-page-header {
    border-top: 1px solid var(--primary-low);
    border-bottom: 1px solid var(--primary-low);
    background: var(--secondary);
    z-index: 3;
    display: flex;
    align-items: center;

    &__back-btn {
      width: 40px;
      min-width: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .chat-channel-title {
      .category-chat-name,
      .chat-name,
      .dm-usernames {
        color: var(--primary);
        display: inline;
        text-overflow: ellipsis;
        white-space: nowrap;
      }
    }

    .-not-following {
      .chat-channel-title {
        max-width: calc(100% - 50px);
      }
      .join-channel-btn {
        margin-left: auto;
      }
    }
  }

  .chat-messages-scroll {
    box-sizing: border-box;
    height: 100%;
  }
}

.chat-full-page-header__left-actions {
  display: flex;
  align-items: stretch;
}

.chat-full-page-header__title {
  display: flex;
  align-items: stretch;
}

.chat-full-page-header__right-actions {
  align-items: stretch;
  display: flex;
  flex-grow: 1;
  gap: 0.5rem;
  font-size: var(--font-up-1);
  justify-content: flex-end;
}

.chat-full-page-header {
  box-sizing: border-box;

  .chat-channel-header-details {
    display: flex;
    align-items: stretch;
    flex: 1;
    max-width: 100%;

    .chat-channel-archive-status {
      text-align: right;
      padding-right: 1em;
    }
  }

  .chat-channel-title {
    margin: 0;
    max-width: 100%;

    .d-icon:not(.d-icon-lock) {
      height: 1.25em;
      width: 1.25em;
    }

    .category-chat-name,
    .dm-username {
      font-weight: 700;
      font-size: var(--font-up-1);
      line-height: var(--font-up-1);
    }

    .dm-usernames {
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
  .chat-channel-retry-archive {
    display: flex;
    margin-top: 1em;
  }
}

.user-preferences .chat-setting .controls {
  margin-bottom: 0;
}

.chat-message-collapser,
.chat-message-text {
  > p {
    margin: 0.5em 0 0.5em;
  }

  > p:first-of-type {
    margin-top: 0.1em;
  }

  > p:last-of-type {
    margin-bottom: 0.1em;
  }
}

.reviewable-chat-message {
  .chat-channel-title {
    max-width: 100%;
  }
}

.chat-channel-dm-title {
  display: flex;
  align-items: center;
  justify-content: space-between;

  .channel-name {
    font-weight: 700;
    font-size: var(--font-up-1);
    line-height: var(--font-up-1);
  }
}

.chat-channel-status {
  background: var(--secondary);
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--primary-low);
}

html.has-full-page-chat {
  height: 100%;
  width: 100%;

  body {
    height: 100%;
    width: 100%;

    #main-outlet {
      display: flex;
      flex-direction: column;

      .full-page-chat {
        height: 100%;
        min-height: 0;
      }

      .main-chat-outlet {
        min-height: 0;
        overflow: hidden;
      }
    }
  }

  &.mobile-view {
    #main-outlet-wrapper {
      padding: 0;
    }
  }

  // these need to apply to desktop too, because iPads
  &.discourse-touch {
    .full-page-chat,
    .chat-channel,
    #main-outlet {
      // allows containers to shrink to fit
      min-height: 0;
    }
  }
  [data-popper-reference-hidden] {
    visibility: hidden;
  }
}