html, body, #game { margin:0; width:100%; height:100%; overflow:hidden; background:#0b1018; }
body { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
canvas { display:block; margin:0 auto; }

html,body{overscroll-behavior:none;touch-action:none;user-select:none;-webkit-user-select:none;}
#rotate-hint{display:none;position:fixed;inset:0;z-index:9999;background:#071019;color:#eaf5ff;
align-items:center;justify-content:center;text-align:center;font-size:32px;font-weight:700;letter-spacing:2px;}
#rotate-hint span{display:block;margin-top:14px;font-size:16px;font-weight:400;color:#91a8bc;letter-spacing:0;}
@media (orientation:portrait) and (max-width:900px){#rotate-hint{display:flex;flex-direction:column;}#game{visibility:hidden;}}