body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    background: #ffffff;
    color: #24292e;
}
h1 {
    font-size: 2.5em;
    border-bottom: 2px solid #0366d6;
    padding-bottom: 0.3em;
    margin-top: 0;
}
h2 {
    font-size: 1.8em;
    border-bottom: 1px solid #eaecef;
    padding-bottom: 0.3em;
    margin-top: 1.5em;
}
h3 { font-size: 1.4em; margin-top: 1.2em; }
h4 { font-size: 1.1em; margin-top: 1em; }
a { color: #0366d6; text-decoration: none; }
a:hover { text-decoration: underline; }
code {
    background: #f6f8fa;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: "SF Mono", Monaco, Menlo, Consolas, monospace;
    font-size: 0.9em;
}
pre {
    background: #f6f8fa;
    padding: 16px;
    border-radius: 6px;
    overflow-x: auto;
    border: 1px solid #e1e4e8;
}
pre code { background: none; padding: 0; }
table {
    border-collapse: collapse;
    width: 100%;
    margin: 1em 0;
}
th, td {
    border: 1px solid #dfe2e5;
    padding: 10px 13px;
    text-align: left;
}
th {
    background: #f6f8fa;
    font-weight: 600;
}
blockquote {
    border-left: 4px solid #dfe2e5;
    padding-left: 16px;
    color: #6a737d;
    margin: 1em 0;
}
ul, ol { padding-left: 2em; }
li { margin: 0.5em 0; }
hr { border: 0; border-top: 1px solid #eaecef; margin: 2em 0; }
kbd {
    background: #fafbfc;
    border: 1px solid #d1d5da;
    border-radius: 3px;
    box-shadow: inset 0 -1px 0 #d1d5da;
    display: inline-block;
    font-family: "SF Mono", Monaco, monospace;
    font-size: 0.85em;
    padding: 3px 5px;
    vertical-align: middle;
}
.toc {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 6px;
    margin: 2em 0;
}
.toc ul { list-style: none; padding-left: 0; }
.toc ul ul { padding-left: 1.5em; }