.scene-bg{background:linear-gradient(180deg,#000000,#0a1a2a);width:100%;height:100%;position:relative;overflow:hidden}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.scene-bg>div:last-child:not(.loading-overlay){animation:fadeIn .3s ease-out forwards}.loading-overlay{animation:fadeOutOverlay 1.2s ease-out 5s forwards}@keyframes fadeOutOverlay{0%{opacity:1;visibility:visible}to{opacity:0;visibility:hidden}}