*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Arial,sans-serif;background:linear-gradient(135deg,#eef5ff,#fff7ed);color:#172033;display:flex;justify-content:center;align-items:center}.home,.game{width:min(900px,92%);text-align:center;padding:30px 0}h1{font-size:clamp(2.2rem,6vw,4rem);margin:0 0 10px}.subtitle{font-size:1.25rem;color:#5d6678;margin-bottom:35px}.operation-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.operation{min-height:180px;border-radius:25px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;font-size:4rem;color:white;text-decoration:none;box-shadow:0 12px 25px #0002;transition:.2s}.operation:hover{transform:translateY(-5px)}.operation span{font-size:1.5rem;font-weight:700}.addition{background:#2e9d68}.subtraction{background:#e26d5a}.multiplication{background:#4778c9}.division{background:#9b65c9}.back{display:inline-block;margin-bottom:15px;color:#40557a;text-decoration:none;font-weight:700}.settings{display:flex;justify-content:center;align-items:center;gap:10px;margin:20px 0;flex-wrap:wrap}select,input{border:2px solid #d7dce5;border-radius:12px;padding:12px 15px;font-size:1rem;background:white}button{border:0;border-radius:12px;padding:12px 20px;font-size:1rem;font-weight:700;cursor:pointer}.primary{background:#315ca8;color:white}.secondary{background:#e7ebf2;color:#24324a}.card{background:white;border-radius:28px;padding:30px;box-shadow:0 15px 40px #0002}.progress{display:flex;justify-content:space-between;color:#667085;font-weight:700}.question{font-size:clamp(3rem,10vw,6rem);font-weight:800;margin:45px 0}#answerForm{display:flex;justify-content:center;gap:10px}#answer{width:220px;text-align:center}.feedback{min-height:30px;font-size:1.2rem;font-weight:700;margin:20px 0}.correct{color:#16834a}.wrong{color:#c53d32}.final{font-size:1.5rem}.hidden{display:none!important}@media(max-width:600px){.operation-grid{grid-template-columns:1fr}.operation{min-height:140px}#answerForm{flex-direction:column;align-items:stretch}#answer{width:auto}}