/* static/loader.css */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #000;          /* 読み込み中は真っ黒 */
  display: flex;
  overflow: hidden;
  transition: opacity .6s ease;
}
#preloader.hide {
  opacity: 0;
  pointer-events: none;
}
#preloader iframe {
  border: none;
  width: 100vw;
  height: 100vh;
  pointer-events: none;      /* 誤タップ防止 */
}