:root {
    --color-principal: #1E3A8A;
    --color-secundario: #FBBF24;
    --color-exito: #28a745;
    --color-beige: #FDF6EC;
    --color-gris-hielo: #E5E7EB;
    --color-gris-navegador: #4B5563;
    --color-azure-links: azure;
    --fuente: 'Courier New', Courier, monospace;
    --tamaño-fuente: 34px;
}

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

body {
    font-size: 20px;
    background-color: var(--color-gris-hielo);
    font-family: Arial, Helvetica, sans-serif;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

h1 {
    color: var(--color-principal);
    text-align: center;
    margin: 1rem 0;
}

/* --- Navegación --- */
nav {
    background: var(--color-gris-navegador);
    border: 0.3px solid var(--color-beige);
    padding: 0.5rem 0;
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    margin: 0;
    padding-left: 0;
}

nav ul li {
    margin: 5px 10px;
}

a {
    /* color: var(--color-principal); */
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* --- Contenedor principal --- */
.container {
    width: 100%;
    max-width: 750px;
    margin: 1rem auto;
    padding: 1rem;
    background: var(--color-principal);
    border-radius: 5px;
    box-shadow: 0 5px 10px var(--color-gris-navegador);
}

label {
    font-weight: 600;
    margin-top: 1.6rem;
    display: block;
    color: var(--color-beige);
}

textarea,
select,
button {
    width: 100%;
    font-size: 1.6rem;
    margin-top: 1rem;
    border: 1px solid var(--color-gris-navegador);
    border-radius: 5px;
    transition: all 300ms ease-in-out;
    font-family: inherit;
}

textarea {
    resize: vertical;
    min-height: 10rem;
}

select:focus,
textarea:focus {
    border-color: var(--color-principal);
    outline: none;
    box-shadow: 0 0 0 2px rgb(135, 180, 226);
}

button {
    background-color: var(--color-exito);
    color: var(--color-azure-links);
    border: none;
    margin-top: 2rem;
    cursor: pointer;
    font-weight: bold;
    transition: all 300ms ease-in-out;
    padding: 0.5rem 1rem;
}

button:hover {
    background-color: #11862c;
}

#salidatexto {
    margin-top: 3rem;
    padding: 2rem;
    background-color: var(--color-gris-hielo);
    border: 1px solid var(--color-gris-navegador);
    border-radius: 5px;
    font-size: 1.6rem;
    color: var(--color-gris-navegador);
    white-space: pre-wrap;
    min-height: 120px;
    line-height: 1.6;
}

/* --- Pie de página --- */
footer {
    color: var(--color-principal);
    text-align: center;
    padding: 1%;
}

.link_green {
    color: #34D399;
}

/* --- Responsividad --- */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    h1 {
        font-size: 1.8rem;
        padding: 0 1rem;
    }

    textarea,
    select,
    button {
        font-size: 1rem;
    }

    nav {
        text-align: center;
        height: auto;
        padding: 10px 0;
    }

    nav ul {
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 5px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.5rem;
    }

    textarea {
        min-height: 7rem;
    }

    button {
        font-size: 1rem;
        padding: 0.5rem;
    }

    #salidatexto {
        font-size: 1.2rem;
        padding: 1rem;
    }
}