*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:system-ui,Segoe UI,Roboto,Arial}
body{background:#1e1e1e;color:#eee;display:flex;align-items:center;justify-content:center}
#gameCanvas{background:#0b663e;border:6px solid #2b3a2b;display:block}
#ui{position:fixed;left:12px;top:12px;color:#fff}
#stats{display:flex;gap:12px;margin-bottom:6px}
#instructions{font-size:13px;opacity:0.9}
span{background:rgba(0,0,0,0.3);padding:6px 8px;border-radius:6px}