#intro-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity 0.45s ease;
}

#intro-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.img360 {
  animation: pulse 2s infinite;
  filter: drop-shadow(0 0 18px rgba(255, 255, 255, 0.2));
}

.overlay-content {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 220px;
  height: 220px;
}

.arrow {
  position: absolute;
  width: 40px;
  height: 40px;
  fill: #ffffff;
  opacity: 0.82;
  animation: pulse 1.5s infinite;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.35));
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.9;
  }
  50% {
    transform: scale(1.3);
    opacity: 0.5;
  }
}

.arrow.up {
  top: 10%;
  transform: translateX(-50%) rotate(0deg);
}

.arrow.down {
  bottom: 10%;
  transform: translateX(-50%) rotate(180deg);
}

.arrow.left {
  left: 10%;
  transform: translateY(-50%) rotate(-90deg);
}

.arrow.right {
  right: 10%;
  transform: translateY(-50%) rotate(90deg);
}