:root{font-family:Arial,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{display:flex;flex-direction:column;align-items:center;background:#e3f2fd}#root{display:flex;flex-direction:column;align-items:center;width:100%}.game-root{display:flex;flex-direction:column;align-items:center;padding:1rem;position:relative}.equation{font-size:32px;font-weight:700;margin:10px;color:#0d47a1;min-height:1.4em}.hud{font-size:16px;color:#1565c0;margin-bottom:8px;display:flex;gap:1.5rem;font-weight:600}.game-canvas{border:3px solid #1565C0;border-radius:8px;cursor:pointer;max-width:100%;height:auto}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:grid;place-items:center;z-index:10}.overlay-box{background:#fff;color:#0d47a1;padding:2rem 3rem;border-radius:12px;text-align:center;box-shadow:0 8px 32px #0000004d}.overlay-box h2{font-size:2rem;margin-bottom:.5rem}.overlay-box p{font-size:1.2rem;margin-bottom:1.5rem}.overlay-box button{background:#1565c0;color:#fff;border:none;padding:.75rem 2rem;font-size:1rem;border-radius:8px;cursor:pointer;font-weight:600}.overlay-box button:hover{background:#0d47a1}