html, body {
  margin: 0;
  height: 100%;
  background: #ffffff;
}

#pembuka {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #475467;
  text-align: center;
  padding: 24px;
}

#pembuka img {
  animation: denyut 1.6s ease-in-out infinite;
}

@keyframes denyut {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

@media (prefers-reduced-motion: reduce) {
  #pembuka img { animation: none; }
}