*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{

    min-height:100vh;

    display:flex;

    justify-content:center;

    align-items:center;

    font-family:'Segoe UI',sans-serif;

    background:
    linear-gradient(
        135deg,
        var(--tema-fondo,#1d3557),
        #3f72af,
        #dbe6f6
    );

}

.login-card{

    width:420px;

    background:#fff;

    border-radius:18px;

    padding:40px;

    box-shadow:
    0 15px 40px rgba(0,0,0,.20);

}

.logo{

    width:90px;

    display:block;

    margin:auto;

    margin-bottom:15px;

}

h1{

    text-align:center;

    color:#1d3557;

    margin-bottom:5px;

    font-size:28px;

}

p{

    text-align:center;

    color:#666;

    margin-bottom:30px;

}

.grupo{

    position:relative;

    margin-bottom:20px;

}

.grupo i:first-child{

    position:absolute;

    left:15px;

    top:15px;

    color:#777;

}

.grupo input{

    width:100%;

    padding:14px 45px;

    border:1px solid #ccc;

    border-radius:10px;

    outline:none;

    transition:.25s;

    font-size:15px;

}

.grupo input:focus{

    border-color:#3f72af;

    box-shadow:
    0 0 8px rgba(63,114,175,.3);

}

#mostrar{

    position:absolute;

    right:15px;

    top:14px;

    cursor:pointer;

    color:#666;

}

button{

    width:100%;

    padding:14px;

    border:none;

    border-radius:10px;

    background:#1d3557;

    color:white;

    font-size:16px;

    cursor:pointer;

    transition:.3s;

}

button:hover{

    background:#284d7a;

}

@media(max-width:500px){

.login-card{

width:92%;

padding:30px;

}

}