.custom-tooltip {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  will-change: transform, opacity, visibility;
  backface-visibility: hidden;
  
  transform: translate(var(--tooltip-x, 0), var(--tooltip-y-offset, -4px)) scale(0.96);
  transition: opacity 0.18s cubic-bezier(0.2, 0, 0, 1),
              transform 0.18s cubic-bezier(0.2, 0, 0, 1),
              visibility 0.18s;

  background-color: var(--color-tooltip-bg);
  color: var(--color-tooltip-text);
  font-family: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.2px;

  padding: 6px 10px;
  border-radius: 8px;
  box-shadow: 0 4px 12px var(--color-tooltip-shadow);
  white-space: nowrap;
	user-select: none;
}

.custom-tooltip.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(var(--tooltip-x, 0), var(--tooltip-y, 0)) scale(1);
}