.eq-tooltip {
  position: absolute;
  z-index: 1000;
  background: var(--md-default-bg-color, #fff);
  border: 1px solid var(--md-default-fg-color--lightest, #ddd);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  padding: 12px 16px;
  max-width: 90vw;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease-in-out;
  overflow-x: auto;
}

.eq-tooltip.visible {
  opacity: 1;
}

/* Arrow pointing down toward the reference */
.eq-tooltip::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 10px;
  background: var(--md-default-bg-color, #fff);
  border-right: 1px solid var(--md-default-fg-color--lightest, #ddd);
  border-bottom: 1px solid var(--md-default-fg-color--lightest, #ddd);
  transform: translateX(-50%) rotate(45deg);
}

/* When tooltip is below the reference, arrow points up */
.eq-tooltip.below::after {
  bottom: auto;
  top: -6px;
  transform: translateX(-50%) rotate(-135deg);
}

/* Dashed underline on cross-page equation refs */
a.eq-ref {
  text-decoration: underline;
  text-decoration-style: dashed;
  text-underline-offset: 2px;
  cursor: pointer;
}