.tooltip {
  position: fixed;
  z-index: 10000;
  max-width: 320px;
  padding: .4em .7em;
  background: var(--f1-bg);
  color: var(--text);
  border: var(--border-width) solid var(--f3-border);
  border-radius: var(--border-radius);
  font-size: .85em;
  line-height: 1.4;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-duration);
  white-space: pre-line;
}

.tooltip.visible {
  opacity: 1;
}