Pure CSS Tooltip

.tooltip {
  position: relative;
  cursor: help;
}

.tooltip::before,
.tooltip::after {
  position: absolute;
  left: 50%;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
}

/* Tooltip text */
.tooltip::before {
  content: attr(data-tooltip);
  bottom: calc(100% + 10px);
  transform: translateX(-50%);
  padding: 8px 12px;
  background: #1a1a2e;
  color: #fff;
  font-size: 14px;
  white-space: nowrap;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Tooltip arrow */
.tooltip::after {
  content: '';
  bottom: calc(100% + 2px);
  transform: translateX(-50%);
  border: 8px solid transparent;
  border-top-color: #1a1a2e;
}

.tooltip:hover::before,
.tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}

/* Bottom tooltip variant */
.tooltip.bottom::before {
  bottom: auto;
  top: calc(100% + 10px);
}

.tooltip.bottom::after {
  bottom: auto;
  top: calc(100% + 2px);
  border-top-color: transparent;
  border-bottom-color: #1a1a2e;
}