*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);display:flex;justify-content:center;align-items:center;min-height:100vh;color:white}.container{text-align:center;padding:2rem}h1{font-size:3rem;font-weight:700}
