*{box-sizing:border-box;font-family:Arial}
body{
margin:0;
min-height:100vh;
/* background:linear-gradient(135deg,#4facfe,#00f2fe); */
display:flex;
justify-content:center;
align-items:center;
}
.container{width:100%;padding:15px}
.card{
max-width:420px;
background:#fff;
padding:30px;
border-radius:12px;
box-shadow:0 10px 30px rgba(0,0,0,.2);
margin:auto;
}
h2{text-align:center;margin-bottom:20px}
input{
width:100%;
padding:12px;
margin-bottom:12px;
border:1px solid #ccc;
border-radius:8px;
}
button{
width:100%;
padding:12px;
background:#4facfe;
border:none;
color:#fff;
font-size:16px;
border-radius:8px;
cursor:pointer;
}
button:hover{background:#00c6ff}
.hidden{display:none}
#msg{text-align:center;margin-top:10px}
@media(max-width:480px){
.card{padding:20px}
}