html,body {margin:0; padding:0; width:100%;height:100%;overflow:hidden;}
body {display:flex;align-items:center;justify-content:center;background:#9fdfef url(cloud-course.jpg) center/cover no-repeat;}
body::before {content:"";position:fixed;inset:0;background:rgba(11,57,72,.13);pointer-events:none;}
#GameDiv {position:relative;width:min(100%,56.25vh);width:min(100%,56.25dvh);height:100%;height:100dvh;box-shadow:0 0 70px rgba(17,65,77,.25);}
#Cocos3dGameContainer,#GameCanvas {width:100%;height:100%;display:block;outline:none;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent;}
:root {--safe-top:env(safe-area-inset-top);--safe-right:env(safe-area-inset-right);--safe-bottom:env(safe-area-inset-bottom);--safe-left:env(safe-area-inset-left);}