body{
    margin:0;
    background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
    height:100vh;
    display:flex;
    align-items:center;
    justify-content:center;
}
.auth-container{
    background:#fff;
    padding:40px 30px;
    border-radius:12px;
    box-shadow:0 8px 30px rgba(0,0,0,.15);
    width:100%;
    max-width:400px;
}
.auth-container h2{
    text-align:center;
    margin-bottom:25px;
    color:#667eea;
}
.form-group{
    margin-bottom:18px;
}
.form-group label{
    display:block;
    margin-bottom:6px;
    font-weight:500;
}
.form-group input[type=text],
.form-group input[type=email],
.form-group input[type=password]{
    width:100%;
    padding:10px 12px;
    border:1px solid #ccc;
    border-radius:6px;
    font-size:15px;
}
.form-group input:focus{
    outline:none;
    border-color:#667eea;
}
.btn{
    width:100%;
    padding:12px;
    background:#667eea;
    color:#fff;
    border:none;
    border-radius:6px;
    font-size:16px;
    cursor:pointer;
    transition:background .3s;
}
.btn:hover{
    background:#5a67d8;
}
.error{
    background:#fee;
    color:#c33;
    padding:8px 12px;
    border-radius:4px;
    margin-bottom:15px;
    font-size:14px;
}
.link{
    text-align:center;
    margin-top:15px;
    font-size:14px;
}
.link a{
    color:#667eea;
    text-decoration:none;
}