/* Background music toggle (bottom-right) */
.music-btn{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:150;
  width:46px;height:46px;border-radius:50%;border:1px solid var(--gold-soft,#e3c27a);
  background:rgba(74,22,32,.88);backdrop-filter:blur(6px);
  display:flex;align-items:center;justify-content:center;gap:3px;padding:0}
.music-btn span{width:3px;height:16px;border-radius:2px;background:var(--gold-soft,#e3c27a);
  transform:scaleY(.25);opacity:.7;transition:opacity .3s}
.music-btn.playing span{opacity:1;animation:eq 1.1s ease-in-out infinite}
.music-btn.playing span:nth-child(2){animation-delay:.28s}
.music-btn.playing span:nth-child(3){animation-delay:.55s}
.music-btn.playing span:nth-child(4){animation-delay:.12s}
@keyframes eq{0%,100%{transform:scaleY(.25)}50%{transform:scaleY(1)}}