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    h1{font-size:28px; color:#0a3d62;}
    h2{font-size:20px; color:#0a3d62; margin-top:30px;}
    h3{font-size:16px; color:#0a3d62; margin-top:22px;}
    .toc{background:#f5fbff;border:1px solid #e1eef8;padding:14px;border-radius:8px;}
    .toc ul{padding-left:18px;}
    .toc a{color:#0563c1; text-decoration:none;}
    .lead{font-size:16px;color:#333;}
    img{max-width:100%; height:auto; border-radius:8px; margin:12px 0;}
    .figure-caption{font-size:13px;color:#666;margin-bottom:14px;}
    .internal-links{background:#fff8e6;padding:12px;border:1px solid #ffe8b5;border-radius:6px;margin:18px 0;}
    footer{font-size:13px;color:#666;margin-top:32px;}
    pre.code{background:#f4f7fb;padding:12px;border-radius:6px;overflow:auto;}