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

:root {
  --channel-list-avatar-size: 38px;
}

.chat-message:not(.user-info-hidden) {
  padding-top: 0.75em;
}

html.has-full-page-chat {
  .footer-nav {
    display: none !important;
  }

  body #main-outlet {
    padding: 0;

    .main-chat-outlet {
      .chat-channel {
        min-width: 0;
      }

      &.has-side-panel-expanded {
        grid-template-columns: 1fr;
        grid-template-areas: "threads";

        .chat-channel {
          display: none;
        }
      }
    }
  }
}

.full-page-chat {
  grid-template-columns: 100%;
  overflow-x: hidden;
  width: 100%;

  .btn:active,
  .btn:hover {
    background: var(--secondary-very-high);

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

  .chat-channel {
    border-radius: 0;
    padding: 0;
  }

  .chat-drawer {
    width: 100%;
  }

  .chat-full-page-header {
    background-color: var(--secondary);
    padding: 0 10px;
    height: 50px;
    min-height: 50px;
  }
}

.sidebar-container .channels-list .chat-channel-divider {
  padding-left: 1em;
}

.sidebar-container .channels-list .chat-channel-row {
  padding: 0.5em;
}

.create-channel-modal {
  .modal-inner-container {
    width: 95%;
  }
}

.chat-full-page-header {
  .chat-channel-header-details {
    .chat-channel-retry-archive {
      flex-direction: column;

      .chat-channel-archive-failed-retry {
        margin-top: 0.5em;
      }
    }
  }
}

.chat-message-separator {
  margin-left: 0;
}

.header-dropdown-toggle.chat-header-icon {
  .icon {
    &.active {
      border: 1px solid var(--primary-low);
      background: var(--primary-very-low);

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