/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
:root:not([inDOMFullscreen='true']):not([chromehidden~='location']):not([chromehidden~='toolbar']) {
  & #tabbrowser-tabbox #tabbrowser-tabpanels .browserSidebarContainer,
  #tabbrowser-tabpanels[dragging-split='true'] {
    width: -moz-available;
    position: relative;

    &.browserSidebarContainer {
      :root:not([zen-no-padding='true']) &:not(.zen-glance-overlay) {
        border-radius: var(--zen-native-inner-radius);
        box-shadow: var(--zen-big-shadow);
        overflow: clip;
      }

      & browser[type='content'] {
        &:not([transparent='true']) {
          background: light-dark(rgb(255, 255, 255), rgb(32, 32, 32));
        }

        &[transparent='true'] {
          background: light-dark(rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.1));
        }
      }

      @media not -moz-pref('layout.css.prefers-color-scheme.content-override', 2) {
        & browser[type='content'] {
          color-scheme: env(-moz-content-preferred-color-scheme);
        }
      }

      @media -moz-pref('zen.theme.acrylic-elements') {
        & browser[type='content'] {
          /* For the rendering engine to apply layering optimizations. This
           * is a hacky solution, but it works for now. */
          will-change: transform;
        }
      }
    }
  }
}