/* ===== スクロール追従バナー ===== */
.mv__banner {
  position: fixed;
  right: 20px;
  bottom: 40px;
  width: clamp(140px, 13vw, 248px);
  z-index: 90;
}
.mv__banner img { width: 100%; border-radius: 4px; }
.mv__banner-close {
  position: absolute;
  top: -12px;
  right: -12px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #005eb8;
  color: #fff;
  border: none;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: background 0.2s;
}
.mv__banner-close:hover { background: #003f80; }
.mv__banner.is-hidden { display: none; }

@media (max-width: 640px) {
  .mv__banner { display: none; }
}