body {
    background-color: #fdfdfd;
    color: #222;
    font-family: "DejaVu Sans", Arial, sans-serif;
    margin: 0;
    padding: 0;
}

/* HEADER */
header {
    text-align: center;
    padding: 20px 0;
    border-bottom: 1px solid #ccc;
}

header h1 {
    margin: 0;
    font-size: 2em;
    font-weight: normal;
}

header p {
    margin: 5px 0 0;
    font-size: 1em;
    color: #555;
}

/* NAV */
nav {
    border-bottom: 1px solid #ccc;
    padding: 10px 0;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li a {
    color: #006400; /* verde GNU */
    text-decoration: none;
    font-weight: normal;
}

nav ul li a:hover {
    text-decoration: underline;
}

/* MAIN */
main {
    padding: 20px;
    max-width: 800px;
    margin: auto;
}

/* SECCIONES */
section {
    margin-bottom: 30px;
}

section h2 {
    border-bottom: 1px solid #ccc;
    padding-bottom: 5px;
    font-size: 1.4em;
    font-weight: normal;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 10px 0;
    border-top: 1px solid #ccc;
    font-size: 0.9em;
    color: #666;
}