/* ── ReadyKiddo Mute Button ─────────────────────────────── */
.rk-mute-btn {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 9999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: background 0.2s, transform 0.15s, border-color 0.2s;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  line-height: 1;
}

.rk-mute-btn:hover {
  background: rgba(0, 0, 0, 0.65);
  border-color: rgba(255, 255, 255, 0.6);
  transform: scale(1.08);
}

.rk-mute-btn:active {
  transform: scale(0.95);
}

.rk-mute-btn[aria-pressed="true"] {
  border-color: rgba(255, 80, 80, 0.6);
  background: rgba(80, 0, 0, 0.55);
}

.rk-mute-icon {
  pointer-events: none;
  user-select: none;
}