.mention-popup {
  position: fixed;
  background: white;
  padding: 12px;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border: 1px solid #e0e0e0;
  z-index: 1000;
  min-width: 200px;
}

.mention-popup:after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid white;
}

.mention-popup h4 {
  margin: 0 0 8px 0;
  font-size: 16px;
  color: #333;
}

.mention-popup p {
  margin: 0;
  font-size: 14px;
  color: #666;
}