.back-home-fixed {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.85);
  color: #e5e7eb;
  font-size: 12px;
  text-decoration: none;
  backdrop-filter: blur(6px);
}
.back-home-fixed:hover {
  background: rgba(30, 64, 175, 0.9);
}

.bgm-toggle {
  position: fixed;
  bottom: 12px;
  right: 12px;
  z-index: 1000;
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: none;
  background: rgba(15, 23, 42, 0.85);
  color: #e5e7eb;
  font-size: 16px;
  cursor: pointer;
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
}
.bgm-toggle:hover {
  background: rgba(30, 64, 175, 0.9);
}