span.s,
span.t,
span.c {
  position: relative;
}

span.s:hover,
span.t:hover,
span.c:hover {
  cursor: help;
  text-decoration: underline dotted;
}

/* Custom tooltip container */
.custom-tooltip {
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: white;
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 12px;
  white-space: pre-wrap;
  word-wrap: break-word;
  max-width: 300px;
  pointer-events: none;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.1s ease-in-out;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  text-transform: none;
  font-weight: normal;
}

/* Arrow for tooltip */
.custom-tooltip::before {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #333;
}

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

/* Hide empty spans and their line breaks */
span.s:empty,
span.t:empty,
span.c:empty {
  display: none;
}

span.s:empty + br,
span.t:empty + br,
span.c:empty + br {
  display: none;
}