Overleaf/services/web/frontend/stylesheets/components/footer.scss

@use 'sass:map';

// Max width of the sidebar
$footer-width-delta: 320px;

@mixin cookie-banner-light {
  --cookie-banner-background: var(--bg-light-primary);
  --cookie-banner-content: var(--content-primary);
  --cookie-banner-link: var(--link-ui);
}

@mixin cookie-banner-dark {
  --cookie-banner-background: var(--bg-dark-secondary);
  --cookie-banner-content: var(--content-primary-dark);
  --cookie-banner-link: var(--link-ui-dark);
}

@mixin footer-pre-redesign {
  --footer-background: var(--bg-dark-primary);
  --footer-content: var(--content-secondary-dark);
  --footer-link: var(--content-secondary-dark);
  --footer-logo-url: url('../../../frontend/js/shared/svgs/overleaf-green.svg');
}

@mixin footer-light {
  --footer-background: var(--bg-light-secondary);
  --footer-content: var(--content-primary);
  --footer-link: var(--content-primary);
  --footer-logo-url: url('../../../frontend/js/shared/svgs/overleaf-green.svg');
}

@mixin footer-dark {
  --footer-background: var(--bg-dark-primary);
  --footer-content: var(--content-primary-dark);
  --footer-link: var(--content-placeholder-dark);
  --footer-logo-url: url('../../../frontend/js/shared/svgs/overleaf-white.svg');
}

@mixin socials-light {
  --facebook-logo-background: #0866ff;
  --facebook-logo-path: transparent;
  --x-logo-path: #000;
  --linkedin-logo-background: #2867b2;
  --linkedin-logo-path: #fff;
}

@mixin socials-dark {
  --facebook-logo-background: #fff;
  --facebook-logo-path: transparent;
  --x-logo-path: #fff;
  --linkedin-logo-background: #fff;
  --linkedin-logo-path: #000;
}

:root {
  .fat-footer {
    @include footer-pre-redesign;
  }

  .cookie-banner {
    @include cookie-banner-light;
  }

  .website-redesign-fat-footer,
  .website-redesign .fat-footer {
    @include footer-light;
    @include socials-light;
  }

  @include theme('default') {
    .ide-redesign-main,
    .project-ds-nav-page {
      .cookie-banner {
        @include cookie-banner-dark;
      }

      .fat-footer {
        @include footer-dark;
        @include socials-dark;
      }
    }
  }
}

@mixin footer-container-up($bp) {
  $size: map.get($grid-breakpoints, $bp);

  @supports (container-type: inline-size) {
    @container fatfooter (width >= #{$size}) {
      @content;
    }
  }

  @supports not (container-type: inline-size) {
    @at-root {
      .project-ds-nav-page & {
        @media (min-width: #{$size + $footer-width-delta}) {
          @content;
        }
      }

      :not(.project-ds-nav-page *) & {
        @media (min-width: #{$size}) {
          @content;
        }
      }
    }
  }
}

@mixin footer-container-down($bp) {
  $size: map.get($grid-breakpoints, $bp);

  @supports (container-type: inline-size) {
    @container fatfooter (width < #{$size}) {
      @content;
    }
  }

  @supports not (container-type: inline-size) {
    @at-root {
      .project-ds-nav-page & {
        @media (max-width: #{$size + $footer-width-delta}) {
          @content;
        }
      }

      :not(.project-ds-nav-page *) & {
        @media (max-width: #{$size}) {
          @content;
        }
      }
    }
  }
}

footer.site-footer {
  --link-color: var(--link-web);
  --link-hover-color: var(--link-web-hover);
  --link-visited-color: var(--link-web-visited);
  --link-text-decoration: none;
  --link-hover-text-decoration: underline;

  background-color: var(--bg-light-primary);
  border-top: 1px solid var(--border-primary-dark);

  @include body-sm;

  min-height: $thin-footer-height;
  line-height: $thin-footer-height - 1; // Hack — in Chrome, using the full $footer-height would generate vertical scrolling

  ul.site-footer-items {
    list-style: none;
    margin: 0;

    > li {
      display: inline-block;
      margin: 0 var(--spacing-04);
    }

    i {
      font-size: var(--font-size-05);
    }
  }
}

.site-footer-content {
  @extend .container-fluid;
}

.sprite-icon-lang {
  display: inline-block;
  vertical-align: middle;
}

#language-picker-toggle {
  text-decoration: none;
  cursor: pointer;

  &::after {
    display: none;
  }

  &:hover {
    .language-picker-text {
      text-decoration: var(--link-hover-text-decoration);
    }
  }

  .material-symbols {
    vertical-align: -0.1875rem;
  }
}

.language-picker .dropdown-menu {
  .dropdown-item {
    &.active {
      color: var(--green-70);
    }

    &:hover {
      text-decoration: none;
    }
  }
}

.fat-footer {
  --footer-text-color: var(--footer-content);
  --footer-background-color: var(--footer-background);
  --link-color: var(--footer-link);
  --link-hover-color: var(--footer-link);
  --link-visited-color: var(--footer-link);
  --link-text-decoration: none;
  --link-hover-text-decoration: underline;

  container-name: fatfooter;
  container-type: inline-size;
  background: var(--footer-background-color);
  color: var(--footer-text-color);
  display: flex;
  flex-direction: column;

  .fat-footer-container {
    margin: var(--spacing-11) auto;

    @include footer-container-down(sm) {
      margin: var(--spacing-11) 0;
    }
  }

  .footer-brand-container {
    flex: 1;
  }

  .fat-footer-sections {
    display: grid;
    column-gap: var(--spacing-07);
    padding: 0 var(--spacing-07) var(--spacing-07);
  }

  .footer-brand {
    display: block;
    height: 37px;
    width: 130px;
    background-image: url('../../../public/img/ol-brand/overleaf-white.svg');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: left center;
  }

  .footer-section-heading {
    color: var(--footer-text-color);

    @include heading-sm;

    margin-bottom: var(--spacing-07);
    margin-top: var(--spacing-07);
  }

  .footer-section ul {
    @include body-sm;
  }

  .footer-section li {
    padding-bottom: var(--spacing-04);
  }

  #footer-brand {
    grid-column: 1/-1;
    margin-top: var(--spacing-07);
  }

  .fat-footer-base {
    color: var(--content-disabled);

    @include body-sm;

    #language-picker-toggle {
      color: var(--footer-text-color);
    }

    .fat-footer-base-meta a:not(.dropdown-toggle, .dropdown-item) {
      color: inherit;
    }

    .language-picker .dropdown-menu {
      .dropdown-header {
        display: none; /* hiding rather than removing as still needed in the thin footer */
      }
    }
  }

  .fat-footer-base-item {
    display: flex;
    white-space: nowrap;
  }

  .fat-footer-social {
    &.x-logo svg path {
      fill: var(--footer-text-color);
    }

    &.facebook-logo svg,
    &.linkedin-logo svg {
      path.background {
        fill: var(--footer-text-color);
      }
    }

    &.facebook-logo svg {
      path.text {
        fill: transparent;
      }
    }

    &.linkedin-logo svg {
      path.text {
        fill: var(--footer-background-color);
      }
    }
  }

  @include footer-container-down(md) {
    .fat-footer-sections {
      grid-template-columns: repeat(2, 1fr);
      grid-template-rows: repeat(4, auto);
    }

    .fat-footer-base {
      display: flex;
      flex-direction: column;
      align-items: center;

      .fat-footer-base-section {
        display: flex;
        align-items: center;
      }

      .fat-footer-base-social {
        order: 1;
      }

      .fat-footer-base-meta {
        display: flex;
        flex-direction: column-reverse;
        align-items: center;
        order: 2;
      }

      .fat-footer-base-item {
        flex-wrap: wrap;
        padding: var(--spacing-02);
        margin: var(--spacing-06);
      }

      .fat-footer-base-meta .fat-footer-base-item {
        gap: var(--spacing-09);
        justify-content: center;

        @include footer-container-down(sm) {
          gap: var(--spacing-06);
        }
      }

      .fat-footer-base-social .fat-footer-base-item {
        gap: var(--spacing-07);
        margin-top: var(--spacing-00);
      }

      .fat-footer-base-copyright {
        order: 2;
      }
    }
  }

  @include footer-container-up(md) {
    .fat-footer-container {
      width: (map.get($grid-breakpoints, 'md') - ($spacing-04 * 2));
    }

    #footer-brand {
      grid-column: auto;
      grid-row: 1/-1;
    }

    .fat-footer-sections {
      grid-template-columns: repeat(4, 1fr);
      grid-template-rows: repeat(2, auto);
    }

    .footer-section:last-of-type {
      grid-column: 4;
    }

    .fat-footer-base {
      display: flex;
      justify-content: space-between;
      margin: var(--spacing-07) auto;

      .fat-footer-base-section {
        display: flex;
        align-items: center;
      }

      .fat-footer-base-item {
        padding: var(--spacing-02);
        margin: var(--spacing-02);
      }

      .fat-footer-base-meta .fat-footer-base-item {
        gap: var(--spacing-07);
      }

      .fat-footer-social {
        margin: var(--spacing-07) var(--spacing-03);
      }
    }
  }

  @include footer-container-up(lg) {
    .fat-footer-container {
      width: (map.get($grid-breakpoints, 'lg') - $spacing-07);
    }

    .fat-footer-sections {
      grid-template-columns: repeat(4, 1fr);
    }
  }

  @include footer-container-up(xl) {
    .fat-footer-container {
      width: (map.get($grid-breakpoints, 'xl') - $spacing-09);
    }

    .fat-footer-sections {
      grid-template-columns: repeat(7, 1fr);
      grid-template-rows: auto;
    }

    .footer-section:last-of-type {
      grid-column: 7;
    }
  }
}

.cookie-banner {
  @include body-sm;

  padding: var(--spacing-05) var(--spacing-07);
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg-light-secondary);
  box-shadow: 0 -5px 8px 0 #0000001a;
  background-color: var(--cookie-banner-background);
  color: var(--cookie-banner-content);

  .cookie-banner-actions {
    padding-top: var(--spacing-04);
  }

  @include media-breakpoint-up(md) {
    align-items: center;
    display: flex;
    flex-wrap: wrap;

    .cookie-banner-content {
      flex: 1;
    }

    .cookie-banner-actions {
      flex-shrink: 0;
      white-space: nowrap;
      padding-top: var(--spacing-00);
    }

    .cookie-banner-content a,
    .cookie-banner-actions .btn-link {
      color: var(--cookie-banner-link);
    }
  }
}

.website-redesign-fat-footer,
.website-redesign .fat-footer {
  --footer-text-color: var(--footer-content);

  .fat-footer-container {
    @include footer-container-down(sm) {
      margin: var(--spacing-11) 0;
    }
  }

  &.fat-footer {
    background: var(--footer-background);

    h2 {
      font-weight: 400;
    }

    .fat-footer-base {
      color: var(--footer-content);

      #language-picker-toggle {
        color: inherit;
      }
    }

    // This is duplication of fill colours in the SVGs themselves. This could be fixed by using :has() but that's not
    // supported in older versions of browsers and these logos need to be correct.
    .fat-footer-social {
      &.x-logo svg path {
        fill: var(--x-logo-path);
      }

      &.facebook-logo svg {
        path.text {
          fill: var(--facebook-logo-path);
        }

        path.background {
          fill: var(--facebook-logo-background);
        }
      }

      &.linkedin-logo svg {
        path.text {
          fill: var(--linkedin-logo-path);
        }

        path.background {
          fill: var(--linkedin-logo-background);
        }
      }
    }
  }

  .footer-brand {
    background-image: var(--footer-logo-url);
  }

  @include footer-container-down(sm) {
    .fat-footer-sections {
      grid-template-columns: repeat(1, 1fr);
      grid-template-rows: repeat(6, auto);
    }
  }
}