body{margin:0;padding:0;overflow:hidden;font-family:sans-serif}canvas{display:block;width:100vw;height:100vh}button{font-family:inherit;background-color:#fff;color:#000;border:none;padding:1em 2em;font-size:18px;cursor:pointer;border-radius:8px;box-shadow:0 4px 10px #0003;transition:background .3s ease}button:hover{background-color:#f0f0f0}#transition{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000;opacity:0;pointer-events:none;z-index:999;transition:opacity 1s ease}#transition.active{opacity:1;pointer-events:all}