*{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;overflow:hidden;touch-action:none;background:#0f172a}#app{display:block;width:100%;height:100%;cursor:pointer}.grid-size-input{position:fixed;z-index:2;width:48px;height:34px;padding:0 6px;border:1px solid #475569;border-radius:10px;background:#1e293b;color:#f8fafc;font:bold 14px system-ui,sans-serif;text-align:center;pointer-events:auto}.grid-size-input:focus{outline:2px solid #6366f1;border-color:#6366f1}