body{margin:0;font-family:Arial,sans-serif;background:linear-gradient(135deg,#4b2cff,#ff4fa0);display:flex;justify-content:center;align-items:center;min-height:100vh}
.card{background:rgba(255,255,255,.12);backdrop-filter:blur(18px);padding:2rem;border-radius:20px;color:#fff;width:min(90%,420px);box-shadow:0 10px 30px rgba(0,0,0,.3)}
input,button{width:100%;padding:12px;margin:10px 0;border-radius:10px;border:none}
button{background:#fff;color:#4b2cff;font-weight:bold;cursor:pointer}
a{color:#fff}
@media(min-width:768px){.card{width:500px}}