body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    max-width: 680px;
    margin: 40px auto;
    padding: 0 20px;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

header {
    text-align: center;
    margin-bottom: 2em;
}

h1 {
    font-size: 1.6em;
    margin-bottom: 0.2em;
    color: #111;
}

h2 {
    font-size: 1.2em;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    color: #444;
}

p {
    margin-bottom: 1em;
}

p.updated {
    color: #666;
    font-size: 0.9em;
    margin-top: 0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 2em 0;
}

nav ul li {
    margin-bottom: 10px;
}

nav ul li a, footer a {
    color: #0066cc;
    text-decoration: none;
}

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

footer {
    margin-top: 3em;
    text-align: center;
    font-size: 0.9em;
    color: #888;
    border-top: 1px solid #ddd;
    padding-top: 1em;
}

@media (max-width: 600px) {
    body {
        margin: 20px auto;
    }
}