/* Overlay nền mờ */
.popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0,1);
  display: none;
  z-index: 9998;
}

/* Popup banner */
.popup-banner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 600px;
  width: 90%;
  border-radius: 6px;
  z-index: 9999;
}

/* Ảnh banner */
.popup-banner img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
}

/* Nút đóng */
.popup-close {
  position: absolute;
  top: -12px;
  right: -12px;
  background: red;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  font-size: 14px;
  cursor: pointer;
}