.floating-banner {
  position: fixed;
  bottom: -200px;
  left: 50%;
  transform: translateX(-50%);
  transition: bottom 0.5s ease;
  z-index: 9999;
  overflow: visible;
}

.floating-banner.show {
  bottom: 30px;
}

.floating-banner .banner-img {
  display: block;
  width: 100%; /* PCでは100% */
  max-width: none;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.floating-banner .close-btn {
  position: absolute;
  top: -12px;
  right: -10px;
  width: 24px;
  height: 24px;
  cursor: pointer;
}

.hidden {
  display: none;
}

/* ▼ モバイル（768px以下）では幅1.5倍＆中央に調整 */
@media screen and (max-width: 768px) {
  .floating-banner {
    left: 50%;
    transform: translateX(-75%); /* 150%の中央に配置 */
  }

  .floating-banner .banner-img {
    width: 150%;
  }
  .floating-banner .close-btn {
    position: absolute;
    top: -12px;
    right: -105px;
  }
}