FreeTube/src/renderer/views/Watch/Watch.scss

@mixin dual-column-template {
  grid-template: 'video video sidebar' 0fr 'info info sidebar' auto 'info info sidebar' 1fr / 1fr 1fr 1fr;
}

@mixin theatre-mode-template {
  grid-template: 'video video video' auto 'info info sidebar' auto 'info info sidebar' auto / 1fr 1fr 1fr;
}

@mixin single-column-template {
  grid-template: 'video' auto 'info' auto 'sidebar' auto / auto;
}

.ageRestricted {
  @include single-column-template;

  display: inline-block;
  max-inline-size: calc(80vh * 1.78);

  @media only screen and (min-width: 901px) {
    inline-size: 300%;
  }
}

.videoLayout {
  @include dual-column-template;

  align-items: start;
  display: grid;

  &.isLoading,
  &.noSidebar {
    @include single-column-template;
  }

  .videoArea {
    grid-area: video;

    .videoAreaMargin {
      margin-block: 0 16px;
      margin-inline: 0;
    }

    .videoPlayer {
      grid-column: 1;
      margin-block: 0;
      margin-inline: auto;
      max-inline-size: calc(80vh * 1.78);
      position: relative;

      .upcomingThumbnail {
        inline-size: 100%;
      }

      .premiereDate {
        align-items: center;
        background-color: rgb(0 0 0 / 80%);
        border-radius: 5px;
        inset-block-end: 12px;
        color: #fff;
        display: flex;
        block-size: 60px;
        inset-inline-start: 12px;
        padding-block: 0;
        padding-inline: 12px;
        position: absolute;

        .premiereIcon {
          float: var(--float-left-ltr-rtl-value);
          font-size: 25px;
          margin-block: 0;
          margin-inline: 12px;
        }

        .premiereText {
          margin-block: 0;
          margin-inline: 12px;
          min-inline-size: 200px;

          .premiereTextTimestamp {
            font-size: 0.85em;
            font-weight: bold;
          }
        }
      }
    }
  }

  .watchVideo {
    grid-column: 1;
    margin-block: 0 16px;
    margin-inline: 0;
  }

  .infoArea {
    grid-area: info;
    position: relative;
  }

  .sidebarArea {
    grid-area: sidebar;

    @media only screen and (min-width: 901px) {
      min-inline-size: 380px;
    }

    @at-root .noSidebar#{&} {
      grid-area: auto;
    }
  }

  .watchVideoPlaylist,
  .watchVideoSidebar,
  .theatrePlaylist {
    margin-block: 0 16px;
    margin-inline: 8px;
  }

  .watchVideoSidebar,
  .watchVideoPlaylist {
    block-size: 500px;
  }

  .watchVideoPlaylist {
    :deep(.videoThumbnail) {
      margin-block-start: auto;
      margin-block-end: auto;
    }
    @media (max-width: 768px) {
      block-size: auto;
    }
  }

  .watchVideoRecommendations,
  .theatreRecommendations {
    margin-block: 0 16px;
    margin-inline: 0;

    @media only screen and (min-width: 901px) {
      margin-block: 0 16px;
      margin-inline: 8px;
    }
  }

  @media only screen and (max-width: 1350px) {
    @include theatre-mode-template;
  }

  @media only screen and (min-width: 901px) {
    &.useTheatreMode {
      @include theatre-mode-template;
    }
  }

  @media only screen and (max-width: 900px) {
    @include single-column-template;
  }

  @media only screen and (min-width: 901px) {
    .infoArea {
      scroll-margin-block-start: 76px;
    }

    .infoAreaSticky {
      position: sticky;
      inset-block-start: 76px;
    }
  }
}