*{box-sizing:border-box;margin:0;padding:0}body{background:linear-gradient(135deg,#667eea,#764ba2);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app,body{align-items:center;display:flex;justify-content:center;min-height:100vh}.card{background:#fff;border-radius:16px;box-shadow:0 10px 40px #0003;padding:3rem 4rem;text-align:center}.card h1{color:#333;font-size:2.5rem;margin-bottom:1rem}.card p{color:#666;font-size:1.1rem}