.center-notice-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: 9998;
  display: none;
}

.center-notice-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 30px;
  border-radius: 12px;
  max-width: 400px;
  z-index: 9999;
  text-align: center;
}

.center-notice-overlay.show { display: block; }