#ad-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 9999;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.4s ease;
}
#ad-popup {
  position: relative;
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(0,0,0,0.25);
  max-width: 420px;
  width: 90%;
  transform: scale(0.9);
  transition: transform 0.4s ease;
}
#ad-popup.show { transform: scale(1); }
#ad-popup img { width: 100%; display: block; cursor: pointer; }
#close-ad {
  position: absolute; top: 10px; right: 10px;
  background: #ff3b30; color: #fff;
  font-size: 22px; border: none;
  border-radius: 50%; width: 38px; height: 38px;
  cursor: pointer; transition: 0.3s ease;
  z-index: 10000;
}
#close-ad:hover { background: #c00; transform: scale(1.1); }