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

header {
    background: #111;
    color: white;
    text-align: center;
    padding: 2em 0;
}

header h1 {
    font-size: 2.5em;
}

nav a {
    margin: 0 1em;
    color: white;
    text-decoration: none;
}

section {
    padding: 2em;
}

.libro-destacado img {
    width: 100%;
    max-width: 500px;
}

footer {
    text-align: center;
    padding: 1em;
    background: #111;
    color: white;
}