.container{text-align:center;padding:2rem}h1{font-size:clamp(2.5rem,8vw,5rem);color:#fff;font-weight:800;letter-spacing:-.02em}*{margin:0;padding:0;box-sizing:border-box}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2)}