:root{color-scheme:dark;--bg: #0b1220;--text: #f4f7fb;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:radial-gradient(circle at top,#1a2740,var(--bg) 55%);color:var(--text)}#game-container{width:100%;height:100%}#game-container canvas{display:block;margin:0 auto;image-rendering:auto}