.grid-container.menu-collapsed {
  --menu-width: var(--sidebar-collapsed-width);
}

.grid-container.controls-collapsed {
  --controls-width: var(--sidebar-collapsed-width);
}

.panel-toggle {
  position: absolute;
  z-index: 2;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 13px;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: #fff;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
}

.menu-toggle {
  right: -13px;
}

.menu-toggle::before {
  content: "‹";
}

.controls-toggle {
  left: -13px;
}

.controls-toggle::before {
  content: "›";
}

.panel-toggle-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.panel-toggle:hover,
.panel-toggle:focus-visible {
  font-weight: bold;
  font-size: 22px;
}

.grid-container.menu-collapsed #divMenu,
.grid-container.controls-collapsed #divControls {
  overflow: hidden;
  background: var(--board-color);
  background-clip: padding-box;
}

.grid-container.menu-collapsed #divMenuInner,
.grid-container.controls-collapsed #divControlsInner {
  visibility: hidden;
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  padding: 0;
  border-width: 0;
  pointer-events: none;
}

.grid-container.menu-collapsed .menu-toggle,
.grid-container.controls-collapsed .controls-toggle {
  inset: 0;
  width: auto;
  flex-direction: column;
  gap: 6px;
}

.grid-container.menu-collapsed .menu-toggle .panel-toggle-label,
.grid-container.controls-collapsed .controls-toggle .panel-toggle-label {
  position: static;
  width: auto;
  height: auto;
  clip: auto;
  overflow: visible;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: var(--font-collapsed);
  line-height: 1.2;
  white-space: nowrap;
}

.grid-container.menu-collapsed .menu-toggle::before {
  content: "›";
}

.grid-container.controls-collapsed .controls-toggle::before {
  content: "‹";
}