/* Menú superior */
header {
    background: #ffffff;
    padding: 1rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Botón hamburguesa */
.menu-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #111;
    display: none;
    margin-top: 0.5rem;
}

/* Estilo del ícono hamburguesa (líneas) */
.menu-toggle::before {
    content: "☰";
    padding-inline: 10px;
}

/* Navegación */
nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: background 0.3s ease, color 0.3s ease;
}

nav a:hover {
    background: #1d4ed8;
    color: #fff;
}

/* Responsive */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
        font-size: 16px;
    }

    nav {
        flex-direction: column;
        display: none;
        width: 100%;
        margin-top: 1rem;
        background: #ffffff;
        padding: 1rem 0;
        border-radius: 0.5rem;
    }

    nav.show {
        display: flex;
    }

    nav a {
        width: 100%;
        text-align: center;
    }
}