body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 2em;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    padding: 1em;
    background-color: #f9f9f9;
    color: #333;
}

h1, h2, h3 {
    color: #0056b3;
}

h1 {
    border-bottom: 2px solid #eee;
    padding-bottom: 0.3em;
}

h2 {
    border-bottom: 1px solid #eee;
    padding-bottom: 0.2em;
}

nav#TOC ul {
    list-style: none;
    padding-left: 0;
}

nav#TOC > ul {
    border: 1px solid #ddd;
    background-color: #fff;
    padding: 1em;
    border-radius: 5px;
    margin-bottom: 2em;
}

nav#TOC li {
    margin-bottom: 0.5em;
}

nav#TOC a {
    text-decoration: none;
    color: #0056b3;
}

nav#TOC a:hover {
    text-decoration: underline;
}

code {
    background-color: #eee;
    padding: 0.2em 0.4em;
    border-radius: 3px;
}

pre code {
    background-color: transparent;
    padding: 0;
}

pre {
    background-color: #eee;
    padding: 1em;
    border-radius: 5px;
    overflow-x: auto;
}

/* Basic responsive design */
@media (max-width: 600px) {
    body {
        margin: 1em;
        padding: 0.5em;
    }
}