.floating-music-button {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 90;
  display: inline-grid;
  grid-template-columns: auto auto;
  align-items: center;
  gap: 8px;
  min-height: 54px;
  padding: 0 16px 0 12px;
  border: 1px solid rgba(0,255,255,.48);
  border-radius: 999px;
  background:
    radial-gradient(circle at 20% 18%, rgba(0,255,255,.25), transparent 40%),
    linear-gradient(145deg, rgba(0,0,0,.9), rgba(9,13,18,.94));
  color: #fff;
  box-shadow: 0 16px 42px rgba(0,0,0,.5), 0 0 22px rgba(0,255,255,.14);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
  backdrop-filter: blur(16px);
}
.floating-music-button:hover,
.floating-music-button:focus-visible {
  border-color: var(--academy-gold, #ffd700);
  box-shadow: 0 18px 48px rgba(0,0,0,.58), 0 0 28px rgba(255,215,0,.2);
  outline: none;
}
.floating-music-button.is-playing {
  border-color: rgba(255,215,0,.7);
  color: var(--academy-gold, #ffd700);
}
.floating-music-button.is-autoplay-pending {
  border-color: rgba(255,215,0,.7);
  animation: floating-music-pulse 1.4s ease-in-out infinite;
}
.floating-music-button.is-autoplay-pending .floating-music-icon {
  box-shadow: 0 0 0 6px rgba(255,215,0,.12);
}
@keyframes floating-music-pulse {
  0%, 100% { transform: translateY(0); box-shadow: 0 16px 42px rgba(0,0,0,.5), 0 0 22px rgba(0,255,255,.14); }
  50% { transform: translateY(-2px); box-shadow: 0 20px 52px rgba(0,0,0,.58), 0 0 30px rgba(255,215,0,.22); }
}
.floating-music-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--academy-gold, #ffd700);
  color: #000;
  font-size: .9rem;
  line-height: 1;
}
.floating-music-label {
  font-size: .82rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}