body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
    color: #333;
}

header {
    text-align: center;
    padding: 20px 0;
    background: #007bff;
    color: white;
}

h1 {
    margin: 0;
    font-size: 1.8em;
}

main {
    width: 90%;
    max-width: 400px;
    margin: 20px auto;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
}

.contenedor-salida {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 20px;
}

#mostrarContraseña {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1em;
    text-align: center;
}

#botonCopiar {
    padding: 10px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

#botonCopiar:hover {
    background: #218838;
}

.medidor-seguridad {
    margin-bottom: 20px;
}

#barraSeguridad {
    background: #ccc;
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    margin-top: 5px;
}

#nivelSeguridad {
    height: 100%;
    width: 30%;
    background: #e74c3c;
    transition: width 0.3s, background 0.3s;
}

.configuracion label {
    display: flex;
    align-items: center;
    margin: 10px 0;
    font-size: 0.9em;
}

.configuracion input[type="checkbox"] {
    margin-right: 10px;
}

#longitudcontraseña {
    width: 100%;
}

#valorLongitud {
    font-weight: bold;
    margin-left: 10px;
}

.botones-accion {
    text-align: center;
}

#botonGenerar {
    padding: 10px 20px;
    font-size: 1em;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

#botonGenerar:hover {
    background: #0056b3;
}