/* Botón flotante */
#btn-play {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 64px;
  height: 64px;
  background: black;
  border: none;
  border-radius: 50%;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  transition: transform 0.2s ease, background 0.3s;
  z-index: 999;
}

#btn-play:hover {
  background: black;
  transform: scale(1.1);
}

#btn-play:active {
  transform: scale(0.95);
}

/* Ripple efecto (ondas) */
.ripple::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  width: 120%;
  height: 120%;
  background: rgba(255, 255, 255, 0.25);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple {
  from {
    transform: scale(0);
    opacity: 1;
  }
  to {
    transform: scale(1.5);
    opacity: 0;
  }
}

/* SVG icónico */
#icon {
  pointer-events: none;
}

/* Responsive */
@media (max-width: 600px) {
  #btn-play {
    width: 52px;
    height: 52px;
  }
}