/* ======= ESTILOS GENERALES ======= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Arial, sans-serif;
}

body {
    background-color: #f4f7fb;
    color: #222;
    line-height: 1.6;
}

/* ======= ENCABEZADO ======= */
header {
    background: linear-gradient(135deg, #0077be, #00a2e8);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    border-bottom: 4px solid #003366;
}

header h1 {
    font-size: 2.5rem;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1rem;
    max-width: 800px;
    margin: 0 auto;
    font-style: italic;
}

/* ======= NAVEGACIÓN ======= */
nav {
    background-color: #003366;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 1rem 1.5rem;
    display: inline-block;
    transition: background 0.3s, color 0.3s;
    font-weight: 500;
}

nav a:hover {
    background-color: #0077be;
    color: #fff;
}

/* ======= CONTENIDO PRINCIPAL ======= */
main {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 1rem;
}

/* Secciones y artículos */
section {
    margin-bottom: 2rem;
}

article {
    background: white;
    border-radius: 8px;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.2s ease;
}

article:hover {
    transform: translateY(-5px);
}

article h3 {
    color: #003366;
    margin-bottom: 0.8rem;
}

article p {
    color: #333;
}

article img {
    width: 100%;
    max-height: 250px;
    object-fit: cover;
    border-radius: 6px;
    margin-top: 1rem;
}

/* ======= LISTAS ======= */
ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

li {
    margin: 0.5rem 0;
}

/* ======= ASIDE ======= */
aside {
    background-color: #e6f1fa;
    padding: 1rem;
    text-align: center;
    margin: 0rem 1rem 2rem 1rem;
    border-left: 3px solid #0077be;
    border-radius: 6px;
}

/* ======= PIE DE PÁGINA ======= */
footer {
    background-color: #003366;
    color: white;
    text-align: center;
    padding: 1.5rem 1rem;
    font-size: 0.9rem;
    border-top: 4px solid #0077be;
}

footer p {
    max-width: 900px;
    margin: 0 auto;
}

.imagenes-centrada {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 20%; 
}

/* ======= RESPONSIVE ======= */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    nav {
        flex-direction: column;
        text-align: center;
    }

    nav a {
        padding: 0.8rem;
        border-top: 1px solid rgba(255, 255, 255, 0.2);
    }

    article {
        padding: 1rem;
    }

    footer {
        font-size: 0.8rem;
    }

}