#music-toggle {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 1100;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(16, 18, 23, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: rgba(255, 255, 255, 0.55);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.15s ease;
}
#music-toggle:hover {
  color: rgba(255, 255, 255, 0.9);
  transform: scale(1.06);
}
#music-toggle.on {
  color: #e76f9e;
  border-color: rgba(231, 111, 158, 0.6);
  box-shadow: 0 0 18px rgba(231, 111, 158, 0.4);
}