.rail {
  --rail-workspace-size: var(--control-size-lg);
  position: relative;
  z-index: 3;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-2) calc(var(--space-3) + var(--rail-dock-clearance, var(--shell-dock-clearance)));
  overflow: visible;
}

.railCollapsed {
  --rail-workspace-size: calc(var(--control-size-md) + 0.1rem);
  justify-content: flex-start;
  gap: 0;
  padding-top: var(--space-4);
  padding-inline: var(--space-1);
}

.topCluster {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.topCluster {
  gap: var(--space-3);
}

.railCollapsed .topCluster {
  gap: var(--space-3);
}

.railCollapsed .topCluster {
  align-items: center;
}

.items {
  width: 100%;
  min-height: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  overflow: visible;
  padding-block: var(--space-1);
}

.itemSlot {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  overflow: visible;
}

.itemSlot:hover,
.itemSlot:focus-within,
.itemSlotActive {
  z-index: 12;
}

.activeIndicator {
  position: absolute;
  left: calc(50% - (var(--rail-workspace-size) / 2) - var(--space-2));
  top: 50%;
  width: 0.26rem;
  height: 0.55rem;
  border-radius: var(--radius-pill);
  background: hsl(0 0% 100% / 0.94);
  transform: translateY(-50%) scaleY(0.72);
  transform-origin: center;
  opacity: 0;
  z-index: 2;
  transition:
    opacity 140ms var(--easing-standard),
    height 180ms var(--easing-standard),
    transform 180ms var(--easing-standard);
}

.itemSlot:hover .activeIndicator {
  opacity: 1;
  height: 1.1rem;
  transform: translateY(-50%) scaleY(1);
}

.itemSlotActive .activeIndicator {
  opacity: 1;
  height: 2.1rem;
  transform: translateY(-50%) scaleY(1);
}

.hoverLabel {
  position: absolute;
  left: calc(100% + var(--space-3));
  top: 50%;
  z-index: 8;
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0 var(--space-3);
  border: 1px solid color-mix(in srgb, var(--color-border-strong) 52%, transparent);
  border-radius: var(--radius-md);
  background: var(--color-surface-muted);
  color: var(--color-text);
  white-space: nowrap;
  box-shadow: 0 12px 28px color-mix(in srgb, black 16%, transparent);
  @include text-label;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-50%) translateX(calc(var(--space-2) * -1));
  transition:
    opacity 140ms var(--easing-standard),
    transform 180ms cubic-bezier(0.22, 1, 0.36, 1);
}

.hoverLabel::before {
  content: "";
  position: absolute;
  top: 50%;
  left: calc(var(--space-2) * -1);
  width: 0.7rem;
  height: 0.7rem;
  border-left: 1px solid color-mix(in srgb, var(--color-border-strong) 52%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border-strong) 52%, transparent);
  background: var(--color-surface-muted);
  transform: translateY(-50%) rotate(45deg);
}

.sectionDivider {
  width: calc(var(--rail-workspace-size) - var(--space-2));
  height: 1px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-border-strong) 58%, transparent);
}

.itemSlot:hover .hoverLabel {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.workspaceButton {
  width: var(--rail-workspace-size);
  height: var(--rail-workspace-size);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  @include interactive-frame(var(--color-surface-muted), var(--color-border), var(--color-text-muted), var(--radius-lg));
  @include text-label;
  @include interactive-frame-hover();
  transition:
    border-radius 180ms var(--easing-standard),
    background 180ms var(--easing-standard),
    color 180ms var(--easing-standard),
    transform 180ms var(--easing-standard);
}

.personalButton {
  background: var(--color-accent);
  border-color: transparent;
  color: var(--color-accent-contrast);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.itemSlot:hover .workspaceButton,
.itemSlot:focus-within .workspaceButton {
  border-radius: var(--radius-md);
  transform: translateY(-1px);
}

.workspaceButtonActive {
  background: var(--color-accent);
  border-color: transparent;
  color: var(--color-accent-contrast);
  border-radius: var(--radius-md);
  box-shadow: none;
}