:root{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:#111827;background:linear-gradient(135deg,#fd8a86,#fad56e)}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center}.app{width:min(92vw,560px);padding:2rem;border-radius:16px;background:#fff;box-shadow:0 10px 30px #0f172a1f}h1{margin-top:0;font-size:1.6rem}p{color:#334155;margin-bottom:1.2rem}button{border:0;border-radius:10px;padding:.7rem 1rem;cursor:pointer;background:#0ea5e9;color:#fff;font-weight:600}button:hover{background:#0284c7}