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    h1{font-size:28px; margin-bottom:6px;}
    h2{font-size:20px; margin-top:28px;}
    h3{font-size:16px; margin-top:18px;}
    .toc{background:#f7f8fa;border:1px solid #e3e6ea;padding:14px;border-radius:6px;}
    .toc ul{padding-left:18px;}
    .toc a{color:#0a66c2;text-decoration:none;}
    .lead{font-size:16px;color:#333;}
    img{max-width:100%;height:auto;border-radius:4px;margin:12px 0;}
    .figure-caption{font-size:13px;color:#666;margin-bottom:12px;}
    .cta{display:inline-block;background:#0a66c2;color:white;padding:10px 16px;border-radius:6px;text-decoration:none;margin-top:10px;}
    .internal-links{background:#fff8e6;padding:12px;border:1px solid #ffe8b5;border-radius:6px;margin:18px 0;}
    .meta{font-size:13px;color:#555;}
    .small{font-size:13px;color:#666;}
    footer{margin-top:30px;font-size:13px;color:#666;}
    pre.code{background:#0f1720;color:#e6eef8;padding:12px;border-radius:6px;overflow:auto;}