仅支持H1/H2/H3、多段、内部链接和本地PNG/JPEG/GIF；原始HTML、列表、表格、代码与强调会拒绝。此页用于检查，最终阅读器分页仍需人工核对。
An original synthetic guide.
Keep the complete source when exporting a book.
Read each paragraph and check the navigation.
Read inputs before interpreting results.
Packaging does not establish factual accuracy.
Unsupported Markdown must stop the export instead of silently disappearing.