:root {
  --letterbox-multiply-calculated: calc(6px * var(--letterbox-multiply-factor));
}

:root[zen-single-toolbar='true']:not([customizing]) {
  #zen-appcontent-navbar-container {
    @media (-moz-bool-pref: 'zen.view.hide-window-controls') {
      &:not([zen-has-hover='true']):not([has-popup-menu]):not(:focus-within):not(:has(*:is([panelopen='true'], [open='true']))) {
        height: 0px !important;
      }
    }
  }
}

:root:not([inDOMFullscreen='true']):not([chromehidden~='location']):not([chromehidden~='toolbar']) {
  & #zen-tabbox-wrapper {
    margin-bottom: var(--letterbox-multiply-calculated) !important;
  }
  
  &[zen-single-toolbar='true'] {
    & #zen-tabbox-wrapper {
      margin-top: var(--letterbox-multiply-calculated) !important;
      transition: margin-top 0.15s ease;
      transition-delay: 0.2s;
    }
    & #zen-appcontent-navbar-container[zen-has-hover="true"] + #zen-tabbox-wrapper {
      margin-top: 0 !important;
    }
  }
  
  &:not([zen-right-side="true"]) #zen-tabbox-wrapper {
    margin-right: var(--letterbox-multiply-calculated) !important;
  }
}