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

.chat-composer {
  &__wrapper {
    display: flex;
    flex-direction: column;
    z-index: 3;
    background-color: var(--primary-very-low);
    padding: 0.5rem 0 env(safe-area-inset-bottom) 0;

    .keyboard-visible & {
      padding-bottom: 0;
    }

    #chat-full-page-uploader,
    #chat-widget-uploader {
      display: none;
    }

    .drop-a-file {
      display: none;
    }

    .chat-replying-indicator {
      padding-inline: 1rem;
    }
  }

  .chat-composer-button,
  .chat-composer-separator {
    align-self: flex-end;
  }

  &__outer-container {
    display: flex;
    align-items: center;
    box-sizing: border-box;
    width: 100%;
    padding-inline: 1rem;
  }

  &__inner-container {
    display: flex;
    align-items: center;
    box-sizing: border-box;
    width: 100%;
    flex-direction: row;
    border: 1px solid var(--primary-low);
    border-radius: 10px;
    background-color: var(--secondary);
    min-height: 50px;
    overflow: hidden;

    .chat-composer.is-focused & {
      border-color: var(--primary-low-mid);
      box-shadow: 0px 0px 4px 1px rgba(0, 0, 0, 0.1);
    }

    .chat-composer.is-disabled & {
      background: var(--primary-low);

      &:hover {
        cursor: not-allowed;
      }
    }
  }

  .chat-composer-button__btn {
    background: none;

    &:not(:disabled) {
      .d-icon {
        color: var(--primary-high);
      }

      .no-touch & {
        &:hover,
        &:focus {
          .d-icon {
            color: var(--primary);
          }

          &.primary {
            .d-icon {
              color: var(--tertiary);
            }
          }
        }
      }

      &.primary {
        .d-icon {
          color: var(--tertiary);
        }
      }
    }

    &:disabled {
      cursor: default;

      .d-icon {
        color: var(--primary-low-mid);
      }
    }
  }

  &__send-btn {
    will-change: scale;

    @keyframes sendingScales {
      0% {
        transform: scale(0.9);
      }
      50% {
        transform: scale(1.2);
      }
      100% {
        transform: scale(0.9);
      }
    }

    .chat-composer.is-sending & {
      animation: sendingScales 1s infinite linear;
    }

    &:not(:disabled) {
      &:hover {
        .d-icon {
          transform: scale(1.2);
        }
      }
    }
  }

  &__input-container {
    display: flex;
    align-items: center;
    box-sizing: border-box;
    width: 100%;
    align-self: stretch;
  }

  --100dvh: 100vh;
  @supports (height: 100dvh) {
    --100dvh: 100dvh;
  }

  &__input {
    overflow-x: hidden;
    width: 100%;
    appearance: none;
    outline: none;
    border: 0;
    resize: none;
    max-height: calc(
      (
          var(--100dvh) - var(--header-offset, 0px) -
            var(--chat-header-offset, 0px)
        ) / 100 * 25
    );
    background: none;
    padding: 0;
    margin: 5px 0;
    text-overflow: ellipsis;
    cursor: inherit;
    @include chat-scrollbar();

    &[disabled] {
      background: none;

      .d-icon {
        opacity: 0.4;
      }
    }

    &:focus,
    &:active {
      outline: none;
    }

    &:placeholder-shown,
    &::placeholder {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
  }

  &__unreliable-network {
    color: var(--danger);
    padding: 0 0.5em;
  }
}

.chat-composer-message-details {
  padding: 0 0.75rem 0.5rem;
  display: flex;
  align-items: center;

  .cancel-message-action {
    margin-left: auto;
  }
}