.app{display:flex;justify-content:center;align-items:center;min-height:100vh}.app-header{text-align:center;padding:2rem;background:#fff;border-radius:12px;box-shadow:0 4px 16px #0000001a}.app-header h1{font-size:3rem;color:#1a1a2e;margin-bottom:.5rem}.app-header p{font-size:1.2rem;color:#555}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:#f0f2f5}