.music-toggle-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 99999;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  font-family: Arial, sans-serif;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.music-toggle-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.48);
}

.music-toggle-btn:active {
  transform: translateY(0);
}

.music-toggle-btn:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 3px;
}

.music-toggle-btn--disabled {
  opacity: 0.72;
  cursor: not-allowed;
}

.music-toggle-btn--disabled:hover {
  transform: none;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
}

.music-toggle-btn--loading {
  opacity: 0.88;
  cursor: wait;
}

@media (max-width: 640px) {
  .music-toggle-btn {
    right: 14px;
    bottom: 14px;
    padding: 10px 14px;
    font-size: 12px;
  }
}