body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 16px;
}
h1 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}
h2 {
    color: #2980b9;
    scroll-margin-top: 16px;
}
h3 {
    color: #2c3e50;
}
a {
    color: #3498db;
}
.meta {
    color: #777;
    margin-top: -8px;
}
.summary {
    background: #f4f8fb;
    border-left: 4px solid #3498db;
    padding: 4px 20px;
    margin: 24px 0;
}
.toc ol {
    columns: 2;
    column-gap: 32px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.95em;
}
th,
td {
    border: 1px solid #ddd;
    padding: 8px 10px;
    text-align: left;
    vertical-align: top;
}
th {
    background: #f4f8fb;
}
.footer {
    margin-top: 40px;
    border-top: 1px solid #ccc;
    padding-top: 10px;
    font-size: 0.9em;
    color: #777;
}
@media (max-width: 600px) {
    .toc ol {
        columns: 1;
    }
    table,
    thead,
    tbody,
    tr,
    th,
    td {
        display: block;
    }
    thead {
        display: none;
    }
    td {
        border: none;
        padding: 4px 0;
    }
    tr {
        border: 1px solid #ddd;
        padding: 8px 10px;
        margin-bottom: 8px;
    }
    td:first-child {
        font-weight: bold;
    }
}