mastodon/app/javascript/flavours/glitch/styles/components/columns.scss

.column__wrapper {
  display: flex;
  flex: 1 1 auto;
  position: relative;
}

.columns-area {
  display: flex;
  flex: 1 1 auto;
  flex-direction: row;
  justify-content: flex-start;
  overflow-x: auto;
  position: relative;
}

.react-swipeable-view-container {
  &,
  .columns-area,
  .column {
    height: 100%;
  }
}

.react-swipeable-view-container > * {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.column {
  width: 330px;
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;

  > .scrollable {
    background: $ui-base-color;
  }
}

.ui {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  background: darken($ui-base-color, 7%);
}

.column {
  overflow: hidden;
}

@include multi-columns('screen and (min-width: 631px)', $parent: null) {
  .columns-area {
    padding: 0;
  }

  .column {
    flex: 0 0 auto;
    padding: 10px;
    padding-left: 5px;
    padding-right: 5px;

    &:first-child {
      padding-left: 10px;
    }

    &:last-child {
      padding-right: 10px;
    }
  }

  .columns-area > div {
    .column {
      padding-left: 5px;
      padding-right: 5px;
    }
  }
}

.column-back-button {
  background: lighten($ui-base-color, 4%);
  color: $highlight-text-color;
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 16px;
  border: 0;
  text-align: unset;
  padding: 15px;
  margin: 0;
  z-index: 3;

  &:hover {
    text-decoration: underline;
  }
}

.column-header__back-button {
  background: lighten($ui-base-color, 4%);
  border: 0;
  font-family: inherit;
  color: $highlight-text-color;
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 16px;
  padding: 0 5px 0 0;
  z-index: 3;

  &:hover {
    text-decoration: underline;
  }

  &:last-child {
    padding: 0 15px 0 0;
  }
}

.column-back-button__icon {
  display: inline-block;
  margin-right: 5px;
}

.column-back-button--slim {
  position: relative;
}

.column-back-button--slim-button {
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 16px;
  padding: 15px;
  position: absolute;
  right: 0;
  top: -48px;
}

.column-link {
  background: lighten($ui-base-color, 8%);
  color: $primary-text-color;
  display: block;
  font-size: 16px;
  padding: 15px;
  text-decoration: none;

  &:hover {
    background: lighten($ui-base-color, 11%);
  }
}

.column-link__icon {
  display: inline-block;
  margin-right: 5px;
}

.column-subheading {
  background: $ui-base-color;
  color: $dark-text-color;
  padding: 8px 20px;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  cursor: default;
}

.column-header__wrapper {
  position: relative;
  flex: 0 0 auto;

  &.active {
    &::before {
      display: block;
      content: "";
      position: absolute;
      top: 35px;
      left: 0;
      right: 0;
      margin: 0 auto;
      width: 60%;
      pointer-events: none;
      height: 28px;
      z-index: 1;
      background: radial-gradient(ellipse, rgba($ui-highlight-color, 0.23) 0%, rgba($ui-highlight-color, 0) 60%);
    }
  }
}

.column-header {
  display: flex;
  font-size: 16px;
  background: lighten($ui-base-color, 4%);
  flex: 0 0 auto;
  cursor: pointer;
  position: relative;
  z-index: 2;
  outline: 0;
  overflow: hidden;

  & > button {
    margin: 0;
    border: none;
    padding: 15px;
    color: inherit;
    background: transparent;
    font: inherit;
    text-align: left;
    text-overflow: ellipsis;
    overflow: hidden;
    white-space: nowrap;
    flex: 1;
  }

  & > .column-header__back-button {
    color: $highlight-text-color;
  }

  &.active {
    box-shadow: 0 1px 0 rgba($ui-highlight-color, 0.3);

    .column-header__icon {
      color: $highlight-text-color;
      text-shadow: 0 0 10px rgba($ui-highlight-color, 0.4);
    }
  }

  &:focus,
  &:active {
    outline: 0;
  }
}

.column {
  width: 330px;
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  overflow: hidden;

  .wide & {
    flex: auto;
    min-width: 330px;
    max-width: 400px;
  }

  > .scrollable {
    background: $ui-base-color;
  }
}

.column-header__buttons {
  height: 48px;
  display: flex;
  margin-left: 0;
}

.column-header__links {
  margin-bottom: 14px;
}

.column-header__links .text-btn {
  margin-right: 10px;
}

.column-header__button {
  background: lighten($ui-base-color, 4%);
  border: 0;
  color: $darker-text-color;
  cursor: pointer;
  font-size: 16px;
  padding: 0 15px;

  &:hover {
    color: lighten($darker-text-color, 7%);
  }

  &.active {
    color: $primary-text-color;
    background: lighten($ui-base-color, 8%);

    &:hover {
      color: $primary-text-color;
      background: lighten($ui-base-color, 8%);
    }
  }

  // glitch - added focus ring for keyboard navigation
  &:focus {
    text-shadow: 0 0 4px darken($ui-highlight-color, 5%);
  }
}

.column-header__notif-cleaning-buttons {
  display: flex;
  align-items: stretch;
  justify-content: space-around;

  button {
    @extend .column-header__button;
    background: transparent;
    text-align: center;
    padding: 10px 0;
    white-space: pre-wrap;
  }

  b {
    font-weight: bold;
  }
}

// The notifs drawer with no padding to have more space for the buttons
.column-header__collapsible-inner.nopad-drawer {
  padding: 0;
}

.column-header__collapsible {
  max-height: 70vh;
  overflow: hidden;
  overflow-y: auto;
  color: $darker-text-color;
  transition: max-height 150ms ease-in-out, opacity 300ms linear;
  opacity: 1;

  &.collapsed {
    max-height: 0;
    opacity: 0.5;
  }

  &.animating {
    overflow-y: hidden;
  }

  hr {
    height: 0;
    background: transparent;
    border: 0;
    border-top: 1px solid lighten($ui-base-color, 12%);
    margin: 10px 0;
  }

  // notif cleaning drawer
  &.ncd {
    transition: none;
    &.collapsed {
      max-height: 0;
      opacity: 0.7;
    }
  }
}

.column-header__collapsible-inner {
  background: lighten($ui-base-color, 8%);
  padding: 15px;
}

.column-header__setting-btn {
  &:hover {
    color: $darker-text-color;
    text-decoration: underline;
  }
}

.column-header__setting-arrows {
  float: right;

  .column-header__setting-btn {
    padding: 0 10px;

    &:last-child {
      padding-right: 0;
    }
  }
}

.column-header__title {
  display: inline-block;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  flex: 1;
}

.column-header__icon {
  display: inline-block;
  margin-right: 5px;
}

.empty-column-indicator,
.error-column {
  color: $dark-text-color;
  background: $ui-base-color;
  text-align: center;
  padding: 20px;
  font-size: 15px;
  font-weight: 400;
  cursor: default;
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: center;
  @supports(display: grid) { // hack to fix Chrome <57
    contain: strict;
  }

  & > span {
    max-width: 400px;
  }

  a {
    color: $highlight-text-color;
    text-decoration: none;

    &:hover {
      text-decoration: underline;
    }
  }
}

.error-column {
  flex-direction: column;
}

// more fixes for the navbar-under mode
@mixin fix-margins-for-navbar-under {
  .tabs-bar {
    margin-top: 0 !important;
    margin-bottom: -6px !important;
  }
}

.single-column.navbar-under {
  @include fix-margins-for-navbar-under;
}

.auto-columns.navbar-under {
  @media screen and (max-width: 360px) {
    @include fix-margins-for-navbar-under;
  }
}

.auto-columns.navbar-under .react-swipeable-view-container .columns-area,
.single-column.navbar-under .react-swipeable-view-container .columns-area {
  @media screen and (max-width: 360px) {
    height: 100% !important;
  }
}

.column-inline-form {
  padding: 7px 15px;
  padding-right: 5px;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  background: lighten($ui-base-color, 4%);

  label {
    flex: 1 1 auto;

    input {
      width: 100%;
      margin-bottom: 6px;

      &:focus {
        outline: 0;
      }
    }
  }

  .icon-button {
    flex: 0 0 auto;
    margin: 0 5px;
  }
}

.floating-action-button {
  position: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 3.9375rem;
  height: 3.9375rem;
  bottom: 1.3125rem;
  right: 1.3125rem;
  background: darken($ui-highlight-color, 3%);
  color: $white;
  border-radius: 50%;
  font-size: 21px;
  line-height: 21px;
  text-decoration: none;
  box-shadow: 2px 3px 9px rgba($base-shadow-color, 0.4);

  &:hover,
  &:focus,
  &:active {
    background: lighten($ui-highlight-color, 7%);
  }
}