h1 {
    font-size: 2em;
}

h2 {
    font-size: 1.7em;
    margin-top: 2em;
    margin-bottom: 0.5em;
}

h3 {
    font-size: 1.5em;
    margin-top: 1.5em;
    margin-bottom: 1em;
}

h4 {
    font-size: 1.2em;
    margin-top: 1.5em;
    margin-bottom: 1em;
}

nav#article-menu a {
    text-decoration: underline;
}

nav#article-menu > nav {
    font-size: 16px;
    line-height: 1.4;
    font-weight: bold;
}

nav#article-menu > nav > nav {
    font-size: 13px;
    line-height: 1.3;
    font-weight: normal;
    margin-bottom: 0.1em;
}