zen-desktop/src/zen/workspaces/zen-workspaces.css

/*
 * 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/.
 */
@namespace html 'http://www.w3.org/1999/xhtml';
@namespace xul 'http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul';

#zen-workspaces-button {
  justify-content: center;
  align-items: center;
  display: flex;
  font-size: x-small;
  padding: 0 3px;
  margin: 0;
  appearance: auto;

  position: relative;

  &[dont-show='true'] {
    display: none !important;
  }

  --toolbarbutton-hover-background: transparent !important;
  border-radius: var(--zen-button-border-radius) !important;
  background: transparent;
  appearance: unset !important;
  height: fit-content;
  gap: 3px;

  container-type: inline-size;
  width: 100%;

  & toolbarbutton {
    margin: 0;
    width: 25px;
    display: flex;
    justify-content: center;
    padding: 0 !important;
    align-items: center;
    position: relative;

    & .zen-workspace-icon[no-icon='true'] {
      width: 6px;
      height: 6px;
      background: light-dark(rgba(0, 0, 0, 0.4), rgba(255, 255, 255, 0.4));
      border-radius: 50%;
    }

    filter: grayscale(1);
    opacity: 0.5;
    transition:
      filter 0.2s,
      opacity 0.2s,
      width 0.1s;

    &[active='true'],
    &:hover {
      filter: grayscale(0);
      opacity: 1;
    }

    &:hover {
      background-color: var(--zen-toolbar-element-bg);
    }
  }

  &[icons-overflow] {
    gap: 0 !important;

    & toolbarbutton {
      margin: 0;
    }

    /* Inlcude separately since ther'es a bug in the 
     * rendering of XUL in firefox */
    & toolbarbutton:not([active='true']) {
%include overflow-icons.inc.css
    }

    &:has(toolbarbutton:hover) toolbarbutton[active='true'] {
%include overflow-icons.inc.css 
    }
  }
}

#zen-workspaces-button .zen-workspace-sidebar-wrapper {
  position: absolute;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  pointer-events: none;
}

#zen-workspaces-button .zen-workspace-sidebar-name {
  margin-left: 0.2rem;
  display: none;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 13px;
}

/** Keep these selectors in sync with the ones in vertical-tabs.css */
#navigator-toolbox {
  & #zen-workspaces-button .zen-workspace-sidebar-name {
    display: block;
  }

  & #zen-workspaces-button .zen-workspace-sidebar-icon {
    margin-inline-end: 5px;
  }

  & #zen-workspaces-button {
    overflow: hidden;
    display: flex;
    gap: 0.5ch;
    overflow-x: auto;
    scrollbar-width: none;
    scroll-behavior: smooth;
  }
}

/* Mark workspaces indicator */
.zen-current-workspace-indicator {
  padding: calc(4px + var(--tab-inline-padding) + var(--zen-toolbox-padding));
  font-weight: 600;
  position: relative;
  max-height: var(--zen-workspace-indicator-height);
  min-height: var(--zen-workspace-indicator-height);
  gap: 10px;
  align-items: center;
  flex-direction: row !important;
  max-width: 100%;
  width: 100%;
  font-size: small;
  padding-right: 10px;

  &::before {
    border-radius: var(--border-radius-medium);
    background: transparent;
    transition: background 0.1s;
    pointer-events: none;
    content: '';
    position: absolute;
    top: var(--zen-toolbox-padding);
    left: calc(var(--zen-toolbox-padding) + 2px);
    width: calc(100% - var(--zen-toolbox-padding) * 2 - 4px);
    height: calc(100% - var(--zen-toolbox-padding) * 2);
  }

  :root:not([zen-private-window]) & {
    &:hover,
    &[open='true'] {
      &::before {
        background: var(--tab-hover-background-color);
      }
    }
  }

  & .zen-current-workspace-indicator-icon {
    font-size: 12px;
    line-height: 1;
  }

  .zen-current-workspace-indicator-name {
    opacity: 0.5;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: auto;
  }

  .zen-workspaces-actions {
    --toolbarbutton-inner-padding: 4px;
    margin-left: auto !important;
    opacity: 0;
    visibility: collapse;
    transition: opacity 0.1s;
    order: 5;
  }

  :root:not([zen-private-window]) &:hover .zen-workspaces-actions,
  & .zen-workspaces-actions[open='true'] {
    visibility: visible;
    pointer-events: auto;
    opacity: 1;
  }
}

/* mark: workspace element */
zen-workspace {
  flex-direction: column;
  width: calc(100% + var(--zen-toolbox-padding) * 2);
  position: absolute;
  height: 100%;
  overflow: hidden;

  :root:not([zen-sidebar-expanded='true']) & {
    width: 100%;
  }

  & > arrowscrollbox {
    max-height: 100%;
    overflow: hidden;
    position: relative;

    &::part(scrollbutton-up),
    &::part(scrollbutton-down) {
      display: none;
    }

    &::part(scrollbox) {
      scrollbar-width: auto;
      scrollbar-color: color-mix(in srgb, currentColor 35%, transparent 65%) transparent; /* Custom scrollbar */
      overflow-y: auto;
    }

    :root[swipe-gesture] &::part(scrollbox) {
      scrollbar-width: none;
    }

    &[overflowing] {
      --zen-scrollbar-overflow-background: light-dark(rgba(0, 0, 0, 0.08), rgba(255, 255, 255, 0.08));
      &::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 1px;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.1s;
        background-color: var(--zen-scrollbar-overflow-background);
      }

      &::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 1px;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.1s;
        background-color: var(--zen-scrollbar-overflow-background);
      }

      &:not([scrolledtostart])::before {
        opacity: 1;
      }

      &:not([scrolledtoend])::after {
        opacity: 1;
      }
    }

    &,
    & .zen-workspace-normal-tabs-section {
      height: 100%;
    }
  }
}

/** Customiable UI, this is an auto generated ID */
#wrapper-zen-workspaces-button {
  width: 100%;
}