:root{--game-width: 420px;--game-height: 700px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;display:flex;align-items:center;justify-content:center;background:radial-gradient(circle at top,#f7f7ff,#cfe8ff 45%,#9cc9f0);font-family:Trebuchet MS,Segoe UI,Tahoma,sans-serif}#root{width:100%;display:flex;justify-content:center}.app{width:min(92vw,var(--game-width));display:flex;flex-direction:column;align-items:center}.game-frame{width:100%;aspect-ratio:420 / 700;max-height:92vh}canvas{width:100%;height:100%;display:block;border-radius:18px;background:#7cc9ff;box-shadow:0 18px 40px #0f1e3c40;touch-action:manipulation}