Stirling-PDF/frontend/src/components/shared/rightRail/RightRail.css

.right-rail {
  background-color: var(--right-rail-bg);
  width: 3.5rem;
  min-width: 3.5rem;
  max-width: 3.5rem;
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  height: 100vh;
  border-left: 1px solid var(--border-subtle);
}

.right-rail-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 0.5rem;
}

.right-rail-section {
  background-color: var(--right-rail-foreground);
  border-radius: 12px;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.right-rail-divider {
  width: 2.75rem;
  border: none;
  border-top: 1px solid var(--tool-subcategory-rule-color);
  margin: 0.25rem 0;
}

.right-rail-icon {
  color: var(--right-rail-icon);
}

.right-rail-icon[aria-disabled="true"],
.right-rail-icon[disabled] {
  color: var(--right-rail-icon-disabled) !important;
  background-color: transparent !important;
}

.right-rail-spacer {
  flex: 1;
}

/* Animated grow-down slot for buttons (mirrors current-tool-slot behavior) */
.right-rail-slot {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 450ms ease-out, opacity 300ms ease-out;
}

.right-rail-enter {
  animation: rightRailGrowDown 450ms ease-out;
}

.right-rail-exit {
  animation: rightRailShrinkUp 450ms ease-out;
}

.right-rail-slot.visible {
  max-height: 18rem; /* increased to fit additional controls + divider */
  opacity: 1;
}

@keyframes rightRailGrowDown {
  0% {
    max-height: 0;
    opacity: 0;
  }
  100% {
    max-height: 18rem;
    opacity: 1;
  }
}

@keyframes rightRailShrinkUp {
  0% {
    max-height: 18rem;
    opacity: 1;
  }
  100% {
    max-height: 0;
    opacity: 0;
  }
}

/* Remove bottom margin from close icon */
.right-rail-slot .right-rail-icon {
  margin-bottom: 0;
}

/* Inline appear/disappear animation for page-number selector button */
.right-rail-fade {
  transition-property: opacity, transform, max-height, visibility;
  transition-duration: 220ms, 220ms, 220ms, 0s;
  transition-timing-function: ease, ease, ease, linear;
  transition-delay: 0s, 0s, 0s, 0s;
  transform-origin: top center;
  overflow: hidden;
}

.right-rail-fade.enter {
  opacity: 1;
  transform: scale(1);
  max-height: 3rem;
  visibility: visible;
}

.right-rail-fade.exit {
  opacity: 0;
  transform: scale(0.85);
  max-height: 0;
  visibility: hidden;
  /* delay visibility change so opacity/max-height can finish */
  transition-delay: 0s, 0s, 0s, 220ms;
  pointer-events: none;
}