:root{color:#1a1a1a;background-color:#f6f6f6;font-family:system-ui,sans-serif;line-height:1.6}body{place-items:center;min-height:100vh;margin:0;display:grid}.container{text-align:center;max-width:480px;padding:2rem}h1{margin-bottom:.5rem;font-size:2.4rem}button{cursor:pointer;background-color:#fff;border:1px solid #ccc;border-radius:8px;margin:1rem 0;padding:.6rem 1.2rem;font-size:1rem}button:hover{border-color:#646cff}.hint{color:#555;font-size:.9rem}code{background-color:#eaeaea;border-radius:4px;padding:.1rem .3rem}