.app{background:#fff;border-radius:16px;box-shadow:0 20px 60px #0000004d;padding:32px;margin-top:20px}.app-header{text-align:center;margin-bottom:32px}.app-header h1{color:#333;font-size:2.5rem;margin-bottom:8px}.subtitle{color:#666;font-size:1rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:20px}#root{max-width:800px;margin:0 auto}