body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;

    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #005a8d;
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    background-color: #003f66;
    margin: 0;
    flex-wrap: wrap; /* esto permite que el menú no se desborde en pantallas pequeñas */
}

nav ul li {
    position: relative;
    margin: 0 15px;
}

nav ul li a {
    text-decoration: none;
    color: white;
    padding: 15px;
    display: block;
}

nav ul li:hover > .submenu {
    display: block;
}

.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #0073b1;
    list-style: none;
    padding: 0;
    z-index: 10;
    min-width: 180px;
}

.submenu li a {
    padding: 10px;
    display: block;
    color: white;
}

main {
    padding: 40px;
    text-align: center;

    flex-grow: 1;
}

h2 {
    color: #005a8d;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
    border-top: 3px solid #007bff;
    position: relative;
    bottom: 0;
    width: 97.3%;
}

footer p {
    margin: 0;
    font-size: 15px;
}

/* 🔁 MEDIA QUERIES: para celulares y tablets */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: stretch;
    }

    nav ul li {
        margin: 0;
        border-bottom: 1px solid #004466;
    }

    nav ul li a {
        padding: 12px 20px;
        text-align: left;
    }

    .submenu {
        position: static;
        background-color: #005a8d;
    }

    .submenu li a {
        padding-left: 30px;
        background-color: #005a8d;
    }

    main {
        padding: 20px 15px;
    }

    h2 {
        font-size: 22px;
    }

    footer {
        width: 100%; /* corregir ancho completo en móvil */
        font-size: 14px;
        padding: 15px;
    }

    header {
        padding: 15px;
    }
}