/* 音乐悬浮开关 - 玻璃半透明风格 */
#music-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(47, 65, 84, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(47, 65, 84, 0.35);
  color: #fff;
}

#music-toggle:hover {
  background: rgba(47, 65, 84, 0.92);
  box-shadow: 0 6px 28px rgba(47, 65, 84, 0.5);
  transform: scale(1.08);
}

#music-toggle:active {
  transform: scale(0.95);
}

#music-toggle svg {
  width: 20px;
  height: 20px;
  fill: #fff;
  transition: opacity 0.2s ease;
}

#music-toggle .icon-pause { display: none; }
#music-toggle.playing .icon-play { display: none; }
#music-toggle.playing .icon-pause { display: block; }