*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;background:linear-gradient(120deg,#0f2027,#203a43,#2c5364);color:#fff}.container{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;text-align:center}.card{background:rgba(255,255,255,.1);padding:1.5rem;border-radius:12px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);max-width:320px}