.popup-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(0,0,0,0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.popup-overlay.show {
  display: flex;
}

.popup-window {
  position: relative;
  background: white;
  padding: 2rem;
  border-radius: 10px;
  max-width: 500px;
  text-align: center;
  z-index: 1000;
}

.popup-close {
  position: absolute;
  top: 10px;
  right: 20px;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 1001;
}