/* ==========================================================================
   Tombol musik — pojok kanan bawah frame
   Hanya muncul saat tamu scroll, hilang lagi setelah diam (lihat music.js),
   supaya tidak menutupi konten pojok bawah saat tamu membaca.
   ========================================================================== */

.music-toggle {
  position: absolute;
  right: 1rem;
  bottom: calc(1rem + env(safe-area-inset-bottom, 0rem));
  z-index: var(--z-float);
  display: grid;
  place-items: center;
  width: 3.25rem;
  height: 3.25rem;
  background: var(--color-accent);
  color: var(--color-ink-strong);
  border: var(--border);
  box-shadow: var(--shadow-hard-sm);
  transition:
    transform var(--dur-fast) var(--ease-snap),
    box-shadow var(--dur-fast) var(--ease-snap),
    opacity var(--dur-base) var(--ease-snap);
}

/* Tersembunyi: sebelum JS siap, saat tamu tidak sedang scroll, dan selama
   Cover tampil (desain Cover tanpa tombol musik). */
.music-toggle:not(.is-ready),
.music-toggle:not(.is-visible),
.frame:has(.cover.is-active) .music-toggle {
  opacity: 0;
  transform: translateY(1rem) rotate(-8deg);
  pointer-events: none;
  transition-duration: var(--dur-base);
}

/* Efek "ditekan": tombol turun menutup bayangannya */
.music-toggle:active {
  transform: translate(var(--border-w), var(--border-w));
  box-shadow: 0 0 0 var(--color-ink-strong);
}

.music-toggle .icon {
  font-size: 1.75rem;
  transition: transform var(--dur-base) var(--ease-overshoot);
}

/* Saat musik main, ikon sedikit bergoyang */
.music-toggle[aria-pressed="true"] .icon {
  animation: music-wobble 1.2s steps(2, jump-none) infinite;
}

.music-toggle[aria-pressed="false"] {
  background: var(--color-paper-soft);
}

@keyframes music-wobble {
  from { transform: rotate(-8deg); }
  to { transform: rotate(8deg); }
}

@media (prefers-reduced-motion: reduce) {
  .music-toggle[aria-pressed="true"] .icon {
    animation: none;
  }
}