body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}

h1,
h2,
h3,
h4 {
    color: #2c3e50;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 0.5em;
}

h2 {
    font-size: 2em;
    margin-top: 1.5em;
    margin-bottom: 1em;
    padding-bottom: 0.3em;
    border-bottom: 1px solid #eee;
}

h3 {
    font-size: 1.5em;
    margin-top: 1.2em;
    margin-bottom: 0.8em;
}

h4 {
    font-size: 1.2em;
    margin-top: 1em;
    margin-bottom: 0.6em;
}

p {
    margin-bottom: 1em;
}

ul,
ol {
    margin-bottom: 1em;
    padding-left: 1.5em;
}

li {
    margin-bottom: 0.5em;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

code {
    background-color: #f8f9fa;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.9em;
}

pre {
    background-color: #f8f9fa;
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: 1em;
}

pre code {
    background: none;
    padding: 0;
}

.card {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card h2 {
    margin-top: 0;
    color: #3498db;
}

.footer {
    text-align: center;
    margin-top: 40px;
    color: #7f8c8d;
    font-size: 0.9em;
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.table-of-contents {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.table-of-contents h2 {
    margin-top: 0;
    border-bottom: none;
}

.table-of-contents ul {
    list-style-type: none;
    padding-left: 0;
}

.table-of-contents li {
    margin-bottom: 8px;
}

.table-of-contents a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
}

.table-of-contents a:hover {
    color: #3498db;
}