*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;background:#eef4ff;color:#172033;font-family:system-ui,"Microsoft YaHei",sans-serif}.game{width:min(92vw,620px);text-align:center;background:#fff;padding:28px;border-radius:20px;box-shadow:0 18px 45px #1d4ed81c}.game h1{margin:0 0 5px}.game p{margin:0 0 12px;color:#64748b}.score{margin:10px;font-size:18px;color:#2563eb}canvas{width:100%;max-width:560px;border-radius:12px;background:linear-gradient(#dbeafe,#f8fbff);border:1px solid #bfdbfe;display:block;margin:auto}button{margin-top:18px;border:0;border-radius:10px;background:#2563eb;color:#fff;padding:10px 20px;font-size:15px;cursor:pointer}