body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;display:flex;justify-content:center;align-items:center;height:100vh;margin:0;background-color:#f0f2f5;color:#333}#app{text-align:center;background-color:#fff;padding:2rem 3rem;border-radius:8px;box-shadow:0 4px 12px #0000001a}h1{margin-top:0;color:#1a202c}.counter-display{font-size:4rem;font-weight:700;margin:1rem 0;color:#2c5282}.button-group button{font-size:1.5rem;padding:.5rem 1.5rem;margin:0 .5rem;border:none;border-radius:4px;cursor:pointer;background-color:#4a90e2;color:#fff;transition:background-color .2s ease-in-out}.button-group button:hover{background-color:#357abd}.button-group button:active{background-color:#2a659b}