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

body{
font-family:Arial;
background:linear-gradient(135deg,#0f172a,#1e293b);
min-height:100vh;
display:flex;
justify-content:center;
align-items:center;
padding:20px;
color:white;
}

.contenedor{
background:#1e293b;
padding:30px;
border-radius:10px;
width:100%;
max-width:400px;
}

h1{
text-align:center;
margin-bottom:20px;
}

#password{
width:100%;
padding:12px;
font-size:18px;
border:none;
border-radius:6px;
margin-bottom:10px;
text-align:center;
}

/* BARRA SEGURIDAD */

.seguridad{
width:100%;
height:10px;
background:#334155;
border-radius:5px;
margin-bottom:5px;
}

#barra{
height:10px;
width:0%;
border-radius:5px;
transition:0.3s;
}

#nivel{
text-align:center;
margin-bottom:15px;
font-weight:bold;
}

/* OPCIONES */

.opciones{
display:flex;
flex-direction:column;
gap:10px;
margin-bottom:20px;
}

.longitud{
display:flex;
justify-content:space-between;
align-items:center;
margin-bottom:20px;
}

.botones{
display:flex;
gap:10px;
}

button{
flex:1;
padding:12px;
border:none;
border-radius:6px;
background:#38bdf8;
font-weight:bold;
cursor:pointer;
}

button:hover{
background:#0ea5e9;
}

/* RESPONSIVE */

@media(max-width:480px){

h1{
font-size:20px;
}

}