soapbox/app/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;
  position: relative;

  &__panels {
    display: flex;
    justify-content: center;
    width: 100%;
    height: 100%;

    &__pane {
      height: 100%;
      pointer-events: none;
      display: flex;
      justify-content: flex-end;
      padding-top: 15px;

      &--start {
        justify-content: flex-start;
      }

      &__inner {
        width: 265px;
        pointer-events: auto;
        height: 100%;
      }
    }

    &__main {
      display: flex;
      flex-direction: column;
      box-sizing: border-box;
      width: 100%;
      max-width: 600px;
      padding: 0 20px;
      @media screen and (max-width: 375px) {
        padding: 0 10px;
      }
      @media screen and (min-width: 895px) {
        margin: 0 20px;
        padding: 0;
      }
    }
  }
}

.column {
  width: 350px;
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

@media screen and (min-width: 631px) {
  .columns-area {
    padding: 0;
  }

  .column,
  .drawer {
    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,
    .drawer {
      padding-left: 5px;
      padding-right: 5px;
    }
  }
}

.columns-area--mobile {
  display: block;
  flex-direction: column;
  width: 100%;
  margin: 0 auto;
  padding: 15px 0;

  .column,
  .drawer {
    width: 100%;
    height: 100%;
    padding: 0;
  }

  .autosuggest-textarea__textarea {font-size: 16px;}

  .search__input {
    line-height: 18px;
    font-size: 16px;
    padding: 15px;
    padding-right: 30px;
    border-radius: 0;
    background-color: var(--foreground-color);
  }

  .search__icon .fa {top: 15px;}
  @media screen and (min-width: 630px) {
    .detailed-status {
      padding: 15px;

      .media-gallery,
      .video-player {
        margin-top: 15px;
      }
    }
    .account__header__bar {padding: 5px 10px;}

    .navigation-bar,
    .compose-form {
      padding: 15px;
    }

    .status {
      padding: 15px 15px 15px (48px + 15px * 2);
      min-height: 48px + 2px;

      &__avatar {
        left: 15px;
        top: 17px;
      }

      &__content {
        padding-top: 5px;
      }

      &__prepend {
        margin-left: 48px + 15px * 2;
        padding-top: 15px;
      }

      &__prepend-icon-wrapper {
        left: -32px;
      }

      .media-gallery,
      .video-player {
        margin-top: 10px;
      }
    }

    .account {
      padding: 15px 10px;
    }

    .notification {
      &__message {
        margin-left: 48px + 15px * 2;
        padding-top: 15px;
      }

      &__favourite-icon-wrapper {
        left: -32px;
      }

      .status {
        padding-top: 8px;
      }

      .account {
        padding-top: 8px;
      }

      .account__avatar-wrapper {
        margin-left: 17px;
        margin-right: 15px;
      }
    }
  }
}

// This controls where the left column breaks.
@media screen and (max-width: 600px + (285px * 1) + (10px * 1)) {
  .columns-area__panels__pane--left {
    display: none;
  }
}

@media screen and (max-width: 600px + (285px * 2) + (10px * 2)) {
  .columns-area__panels__pane--right {
    display: none;
  }
}

.column-back-button {
  background: var(--accent-color--faint);
  color: var(--highlight-text-color);
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 16px;
  line-height: inherit;
  border: 0;
  border-radius: 10px 10px 0 0;
  text-align: unset;
  padding: 15px;
  margin: 0;
  z-index: 3;
  outline: 0;

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

.column-header__back-button {
  background: var(--brand-color--faint);
  border: 0;
  font-family: inherit;
  color: var(--highlight-text-color);
  cursor: pointer;
  white-space: nowrap;
  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: -49px;

  @media screen and (max-width: $nav-breakpoint-2) {
    top: -35px;
    font-size: 14px;
    padding: 8px 15px;
  }
}

.column-link {
  background: var(--brand-color--med);
  color: var(--primary-text-color);
  display: block;
  font-size: 16px;
  padding: 15px;
  text-decoration: none;

  &:hover,
  &:focus,
  &:active {
    background: var(--brand-color--faint);
  }

  &:focus {
    outline: 0;
  }

  &--transparent {
    background: transparent;
    color: var(--background-color);

    &:hover,
    &:focus,
    &:active {
      background: transparent;
      color: var(--primary-text-color);
    }

    &.active {
      color: var(--brand-color);
    }
  }
}

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

.column-link__badge {
  display: inline-block;
  border-radius: 4px;
  font-size: 12px;
  line-height: 19px;
  font-weight: 500;
  background: var(--brand-color--med);
  padding: 4px 8px;
  margin: -6px 10px;
}

.column-subheading {
  background: var(--brand-color--med);
  color: var(--primary-text-color--faint);
  padding: 8px 20px;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  cursor: default;
}

.columns-area--mobile .column {
  @include standard-panel;
}

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

  &.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, hsla(var(--brand-color_hsl), 0.23) 0%, hsla(var(--brand-color_hsl), 0) 60%);
    }
  }
}

.column-header {
  display: flex;
  font-size: 16px;
  flex: 0 0 auto;
  cursor: pointer;
  position: relative;
  z-index: 2;
  outline: 0;
  overflow-x: auto;

  & > button,
  & > .btn {
    margin: 0;
    border: 0;
    padding: 15px;
    color: inherit;
    background: transparent;
    font: inherit;
    text-align: left;
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.2s;

    &--sub {
      font-size: 14px;
      padding: 6px 10px;
    }

    &.grouped {
      margin: 6px;
      color: var(--primary-text-color--faint);
    }

    &.active {
      color: var(--primary-text-color);

      &::before {
        height: 100%;
        opacity: 1;
      }
    }

    &::before {
      content: '';
      display: block;
      position: absolute;
      width: 100%;
      background-color: var(--accent-color--faint);
      border-radius: 10px;
      transition: 0.2s;
      opacity: 0;
    }

    @media screen and (max-width: $nav-breakpoint-2) {
      padding: 8px;
      font-size: 14px;

      &.grouped {
        margin: 6px 2px 6px 6px;
      }

      &.active {
        border-radius: 5px;
      }
    }
  }

  &:hover .btn.grouped {

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

  & > .column-header__back-button {
    color: var(--highlight-text-color);
  }

  &.active {
    box-shadow: 0 1px 0 hsla(var(--highlight-text-color_hsl), 0.3);

    .column-header__icon {
      color: var(--highlight-text-color);
      text-shadow: 0 0 10px hsla(var(--highlight-text-color_hsl), 0.4);
    }
  }

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

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

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

.column-header__button {
  cursor: pointer;
  border: 0;
  padding: 0 15px;
  font-size: 16px;
  color: var(--primary-text-color--faint);
  background: transparent;

  &:hover {
    color: hsla(var(--primary-text-color_hsl), 0.8);
  }

  &.active {
    color: var(--primary-text-color);
    background: var(--accent-color--med);

    &:hover {
      color: var(--primary-text-color);
      background: var(--accent-color--med);
    }
  }
}

.column-header__collapsible {
  max-height: 70vh;
  overflow: hidden;
  overflow-y: auto;
  color: var(--primary-text-color--faint);
  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 var(--brand-color--med);
    margin: 10px 0;
  }
}

.column-header__collapsible-inner {
  background: var(--background-color);
  padding: 15px;
}

.column-header__setting-btn {
  &--link {
    text-decoration: none;

    .fa {
      margin-left: 10px;
    }
  }

  &:hover {
    color: var(--primary-text-color--faint);
    text-decoration: underline;
  }
}

.column-header__setting-arrows {
  float: right;

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

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

.column-header__expansion {
  overflow-x: scroll;
  overflow-y: hidden;
  white-space: nowrap;
}

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

.column-settings__outer {
  background: var(--brand-color--med);
  padding: 15px;
}

.column-settings__section {
  color: var(--primary-text-color--faint);
  cursor: default;
  display: block;
  font-weight: 500;
  margin-bottom: 10px;
}

.column-settings__hashtags {
  .column-settings__row {
    margin-bottom: 15px;
  }

  .column-select {
    &__control {
      @include search-input;
    }

    &__placeholder {
      color: var(--primary-text-color);
      padding-left: 2px;
      font-size: 12px;
    }

    &__value-container {
      padding-left: 6px;
    }

    &__multi-value {
      background: var(--brand-color--med);

      &__remove {
        cursor: pointer;

        &:hover,
        &:active,
        &:focus {
          background: var(--brand-color--med);
          color: var(--primary-text-color);
        }
      }
    }

    &__multi-value__label,
    &__input {
      color: var(--primary-text-color--faint);
    }

    &__clear-indicator,
    &__dropdown-indicator {
      cursor: pointer;
      transition: none;
      color: var(--primary-text-color);

      &:hover,
      &:active,
      &:focus {
        color: var(--primary-text-color);
      }
    }

    &__indicator-separator {
      background-color: var(--brand-color--med);
    }

    &__menu {
      @include search-popout;
      padding: 0;
      background: var(--background-color);
    }

    &__menu-list {
      padding: 6px;
    }

    &__option {
      color: var(--primary-text-color);
      border-radius: 4px;
      font-size: 14px;

      &--is-focused,
      &--is-selected {
        background: var(--background-color);
      }
    }
  }
}

.column-settings__row {
  .text-btn {
    margin-bottom: 15px;
  }
}

.empty-column-indicator,
.error-column {
  color: var(--primary-text-color);
  background: var(--accent-color--med);
  text-align: center;
  padding: 40px;
  font-size: 15px;
  font-weight: 400;
  cursor: default;
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: center;
  min-height: 160px;

  @supports(display: grid) { // hack to fix Chrome <57
    contain: strict;
  }

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

  a {
    color: var(--highlight-text-color);
    text-decoration: none;

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

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

.column-link--transparent .icon-with-badge__badge {
  border-color: var(--background-color);
}