body{
    min-height:100vh;
    background: var(--bg-beranda) center center/cover no-repeat;
    display:flex;
    justify-content:center;
    align-items:center;
    padding:20px;
}
.overlay{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,0.45);
}

.login-title{
    font-weight:bold;
    color:#2c3e50;
    font-size:24px;
}

@media (max-width:576px){
    .login-title{
        font-size:18px;
        line-height:1.4;
    }
}

.login-card{
    width:100%;
    max-width:420px;
    margin:50px auto;
}

.btn-login{
    background:#2c3e50;
    border:none;
}

.btn-login:hover{
    background:#1a252f;
}

@media (max-width:576px){
    .btn-back{
        width:38px;
        height:38px;
        font-size:15px;
        top:12px;
        left:12px;
    }
}

.btn-back{
    position:fixed;
    top:20px;
    left:20px;
    z-index:3;
    width:45px;
    height:45px;
    border-radius:50%;
    background:#ffffff;
    display:flex;
    justify-content:center;
    align-items:center;
    text-decoration:none;
    color:#2c3e50;
    font-size:18px;
    box-shadow:0 2px 8px rgba(0,0,0,0.3);
}

.btn-back:hover{
    background:#2c3e50;
    color:#fff;
}

.text-muted{
    font-size:14px;
}

@media(max-width:576px){
    .text-muted{
        font-size:12px;
    }
}