body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    color: #333;
}
h1 {
    color: #000;
    font-size: 26px;
    margin-bottom: 10px;
}
h2 {
    color: #000;
    font-size: 18px;
    margin-top: 30px;
    margin-bottom: 15px;
}
h3 {
    color: #000;
    font-size: 16px;
    margin-top: 25px;
    margin-bottom: 10px;
}
.subtitle {
    color: #7f7f7f;
    font-size: 15px;
    margin-bottom: 20px;
}
.toc {
    margin: 30px 0;
}
.toc a {
    color: #003afa;
    text-decoration: none;
    display: block;
    margin: 5px 0;
}
.toc a:hover {
    text-decoration: underline;
}
ul {
    list-style-type: square;
    margin: 15px 0;
    padding-left: 30px;
}
ul ul {
    list-style-type: circle;
}
ul ul ul {
    list-style-type: square;
}
a {
    color: #003afa;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
strong {
    font-weight: bold;
}
em {
    font-style: italic;
}
.section {
    margin: 30px 0;
}