@media (-moz-bool-pref: "zen.tabs.vertical") {

  /* COLOR POP of pinned tabs (when toggled) */
  @media (-moz-bool-pref: "uc.pins.bg-color.pop") and (not (-moz-bool-pref: "uc.pins.disable-bg-color")) {
    /* background color of pinned tabs in a normal state (not hovered/selected) */
    .tabbrowser-tab[pinned] .tab-stack .tab-background {
      background-color: light-dark(hsl(from var(--zen-primary-color) h 70% 92%), hsl(from var(--zen-primary-color) h 25% 15%)) !important;
    }
    /* background color when hovering */
    .tabbrowser-tab[pinned]:hover .tab-stack .tab-background{
      background-color: light-dark(hsl(from var(--zen-primary-color) h 70% 90%), hsl(from var(--zen-primary-color) h 25% 17%)) !important;
    }
    /* background color when selected */
    .tabbrowser-tab[pinned][selected="true"] .tab-stack .tab-background,
    .tabbrowser-tab[pinned][multiselected="true"] .tab-stack .tab-background {
      background-color: light-dark(hsl(from var(--zen-primary-color) h 70% 85%), hsl(from var(--zen-primary-color) h 25% 28%)) !important;
    }
    /* background color when hovering and selected */
    .tabbrowser-tab[pinned][selected="true"]:hover .tab-stack .tab-background,
    .tabbrowser-tab[pinned][multiselected="true"]:hover .tab-stack .tab-background{
      background-color: light-dark(hsl(from var(--zen-primary-color) h 70% 83%), hsl(from var(--zen-primary-color) h 25% 30%)) !important;
    }
  }
    
  /* Makes pinned tabs transparent (when toggled) */
  @media (-moz-bool-pref: "uc.pins.disable-bg-color") {
    .tabbrowser-tab[pinned]:not(:hover):not([selected="true"]) .tab-stack .tab-background {
      background-color: transparent !important;
    }
  }
  
  /* Make pinned tabs taller (when toggled) */
  @media (-moz-bool-pref: "uc.pins.tall") and (-moz-bool-pref: "zen.view.sidebar-expanded") and (not (-moz-bool-pref: "zen.view.sidebar-expanded.on-hover")) {
    .tabbrowser-tab[pinned] { 
      min-height: 43px !important;
    }
  }  
  
  @media (-moz-bool-pref: "zen.view.sidebar-expanded") and (not (-moz-bool-pref: "zen.view.sidebar-expanded.on-hover")) {

    /* Set width of pinned tabs (Dropdown) */
    :root:has(#theme-SuperPins[uc-pins-width="Thin"]) {
      --pins-width: 50px;
    }
    :root:has(#theme-SuperPins[uc-pins-width="Normal"]) {
      --pins-width: 60px;
    }
    :root:has(#theme-SuperPins[uc-pins-width="Wide"]) {
      --pins-width: 70px;
    }

    :root:has(#theme-SuperPins[uc-pins-width="Thin"],
              #theme-SuperPins[uc-pins-width="Normal"],
              #theme-SuperPins[uc-pins-width="Wide"]) {
              #vertical-pinned-tabs-container {
                grid-template-columns: repeat(auto-fit, minmax(var(--pins-width), auto)) !important;
              }
    }

    /* Set margin between pinned tabs (Dropdown) */
    :root:has(#theme-SuperPins[uc-pins-gap="Small"]) {
      --pins-gap: 1px;
    }
    :root:has(#theme-SuperPins[uc-pins-gap="Normal"]) {
      --pins-gap: 3.5px;
    }
    :root:has(#theme-SuperPins[uc-pins-gap="Big"]) {
      --pins-gap: 6px;
    }

    :root:has(#theme-SuperPins[uc-pins-gap="Small"],
              #theme-SuperPins[uc-pins-gap="Normal"],
              #theme-SuperPins[uc-pins-gap="Big"]) {
                #vertical-pinned-tabs-container {
                  gap: var(--pins-gap) calc(var(--pins-gap) + 3.5px) !important;
                }
    }

    @media (-moz-bool-pref: "uc.pins.tall") {
      .tabbrowser-tab[pinned] { 
        min-height: 43px !important;
      }
    }
  }
  
  /* Make pinned tabs look more box like */
  @media (-moz-bool-pref: "uc.pins.box-like-corners") {
    .tabbrowser-tab[pinned] .tab-stack .tab-background{
      border-radius: 5px !important;
    }
  }

  /* Adds border to pinned tabs (when toggled) */
  @media (-moz-bool-pref: "uc.pins.border") {
    .tabbrowser-tab[pinned] .tab-stack .tab-background{
      border: 1px solid var(--zen-colors-border) !important;
    }
  }
  
  /* Hides unloaded tabs when tab bar is collapsed (when toggled)*/
  @media (not (-moz-bool-pref: "zen.view.sidebar-expanded")) {
    :root:has(#theme-SuperPins[uc-pins-only-show-active="Normal"]) {
      .tabbrowser-tab[pinned][pending="true"] {
        position: absolute !important; /* Using position: absolute and visibility: hidden instead of display:none stops the icons of unloaded tabs from loading when sidebar expands */
        visibility: hidden !important;
      }
    }

    /* Shows all pins when user is hovering over them when tab bar is collapsed */
    :root:has(#theme-SuperPins[uc-pins-only-show-active="OnHover"]) {
      .tabbrowser-tab[pinned][pending="true"] {
        position: absolute !important; /* Using position: absolute and visibility: hidden instead of display:none stops the icons of unloaded tabs from loading when sidebar expands */
        visibility: hidden !important;
      }

      #vertical-pinned-tabs-container:hover .tabbrowser-tab[pinned][pending="true"] {
        position: relative !important;
        visibility: visible !important;
      }

      #vertical-pinned-tabs-container {
        position: relative;
      }

      #vertical-pinned-tabs-container::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 10px;
        background-color: transparent;
      }

      #vertical-pinned-tabs-container::before:hover .tabbrowser-tab[pinned][pending="true"] {
        position: relative !important;
        visibility: visible !important;
      }
    }
  }
  
  /* Hides unloaded tabs when tab bar is collapsed when in "Expand on hove" mode (when toggled) */
  @media (-moz-bool-pref: "zen.view.sidebar-expanded") and (-moz-bool-pref: "zen.view.sidebar-expanded.on-hover") {
    :root:has(#theme-SuperPins[uc-pins-only-show-active="Normal"]),
    :root:has(#theme-SuperPins[uc-pins-only-show-active="OnHover"]) { 
      #navigator-toolbox:not(
        :is( 
        #navigator-toolbox[zen-has-hover],
        #navigator-toolbox:focus-within,
        #navigator-toolbox[movingtab],
        #navigator-toolbox[flash-popup],
        #navigator-toolbox[has-popup-menu],
        #navigator-toolbox:has(.tabbrowser-tab:active),
        #navigator-toolbox:has(*[open='true']:not(tab):not(#zen-sidepanel-button)))) {
          .tabbrowser-tab[pinned][pending="true"] {
            position: absolute !important; /* Using position: absolute and visibility: hidden instead of display:none stops the icons of unloaded tabs from loading when sidebar expands */
            visibility: hidden !important;
          }
      }
    }
  }
}