*{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;line-height:1.6;color:#333}.App{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:0 20px}.text-center{text-align:center}.btn{display:inline-block;padding:12px 24px;background-color:#007bff;color:#fff;text-decoration:none;border-radius:6px;transition:background-color .3s ease}.btn:hover{background-color:#0056b3}.btn-secondary{background-color:#6c757d}.btn-secondary:hover{background-color:#545b62}