.po-tooltip {
  position: fixed;
  z-index: 1000;
  background-color: #363636;
  border-radius: 4px;
  box-shadow: 0 4px 8px rgba(0,0,0,.15);
  max-width: 15rem;
  padding: 8px 16px;
  font-size: .875rem;
  line-height: 1.25rem;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease; /* fade suave */
}

.po-tooltip-arrow {
  width: 8px;
  height: 8px;
  position: absolute;
  background-color: #363636;
  opacity: 0.9;
}

.po-arrow-bottom {
  top: calc(100% - 4px);
  transform: rotate(-135deg);
}

.po-tooltip-content {
  font-family: 'OpenSans', sans-serif;
  font-weight: 400;
  font-size: 0.875rem;
  line-height: 24px;
  color: #fff;
  opacity: 0.9;
  white-space: normal;
  word-wrap: break-word;
  text-align: left;
}