/* Popup overlay background */
#popupOverlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 999;
}

/* Popup box styling */
#popupBox {
  background: linear-gradient(145deg, #ffffff, #f4f8ff);
  width: 90%;
  max-width: 420px;
  margin: 100px auto;
  padding: 30px 25px;
  text-align: center;
  border-radius: 20px;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.25);
  font-family: 'Segoe UI', Arial, sans-serif;
  color: #333;
  border: 1px solid rgba(0, 123, 255, 0.1);
  backdrop-filter: blur(6px);
  animation: popupSlide 0.8s ease-out;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Hover effect */
#popupBox:hover {
  transform: scale(1.05);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
}
 #popupMessage { margin-top: 10px; color: #333; }

/* Slide and fade animation */
@keyframes popupSlide {
  0% {
    opacity: 0;
    transform: translateY(-40px) scale(0.9);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}