The file renders perfectly in a fresh browser context — no garbled text at all. Chinese characters display correctly: 叶宇航, 中南林业科技大学, all sections.

Self-check conclusion:

1. ✅ File is valid UTF-8 without BOM
2. ✅ <meta charset="UTF-8"> is declared as the very first thing in <head>, before any Chinese content appears (within first 400 bytes — actually the meta tag is at ~byte 70, before the title/Chinese content)
3. ✅ Chinese content intact (叶宇航, 中南林业科技大学, etc. all present and decodable)
4. ✅ Fresh browser rendering shows zero garbled characters
5. ✅ Cannot be misinterpreted as GBK (GBK decode fails)

So the file is NOT the source of the乱码. The user says "在网站上打开是乱码" — "opens as garbled text on the website". This suggests:

Most likely causes on their end:

1. 他们打开方式不对：直接双击用记事本打开？No — 记事本 detects UTF-8 fine on Win10/11. But older Windows or if opened with an editor defaulting to ANSI/GBK...
2. 下载/传输过程损坏：If they downloaded the file via some platform that re-encodes, or copied only partially.
3. 用 Word 打开 HTML：Word might prompt encoding.
4. 某种"网站"预览：Maybe they uploaded to some online preview (like the WorkBuddy assignment platform, or QQ/WeChat preview) which guesses encoding. Some preview services detect encoding poorly.
5. 浏览器缓存：They might be viewing an old cached version.
6. 文件没有下载完整 — they might have copied text from chat into a file instead of downloading.

Wait — actually, there's a subtle possibility I should consider: the user might have downloaded the file through the artifact card, and the platform serves it with a wrong Content-Type: text/html; charset=xxx header? When opened via file:// the meta charset governs; when served via HTTP, the HTTP header charset overrides the meta tag. If a platform serves the file with charset=gbk or charset=iso-8859-1 header, the browser would honor the header and show乱码, regardless of our meta tag!

Hmm, but I can't control that. However — I CAN add a defense: the <meta charset="UTF-8"> is already there. For HTTP-served cases with wrong headers, nothing in the file can override the header. But this is rare for typical file hosting.

Another VERY likely scenario: 用户双击打开时用的是 IE 或旧版浏览器? Unlikely.

Or: the user opened it in VS Code or another editor that auto-detects wrongly? VS Code detects UTF-8 reliably.

Hmm, wait — one more important scenario: 用户把文件上传到某个作业提交网站/预览平台，那个平台按 GBK 解码渲染。比如某些教学平台预览 HTML 时按本地编码（Windows 中文环境 GBK）解码 UTF-8 文件 → 乱码。This is actually the classic scenario for Chinese students: 提交到实验平台后在线预览乱码.

What can I do to make it robust against GBK-misinterpretation? If a viewer decodes UTF-8 bytes as GBK, the text WILL be garbled — nothing in the file can fix that retroactively (byte sequences already misread). The only "defense" is... nothing file-side.

BUT there's one thing: if the platform respects the meta charset when no BOM... most browsers do when rendering from file:// or when HTTP header lacks charset.

Practical solutions to give the user:

1. 自检结果：文件本身编码完全正确（UTF-8 + charset 声明 + 实测渲染正常）——给出证据（截图）。

2. 解释乱码的真正原因 likely: 打开方式/传输问题。列出可能原因与对应解决办法:

   • 用浏览器打开而不是记事本/Word：右键 → 打开方式 → Chrome/Edge
   • 如果是在线平台预览乱码：那是平台按 GBK 解码的问题，下载到本地用浏览器打开即可正常
   • 浏览器手动切换编码：Edge/Chrome 新版没有编码切换菜单了；老浏览器可以
   • 确保下载的是原文件而不是复制粘贴的文本

3. 额外加固：我可以给文件加上 UTF-8 BOM？BOM 会强制很多程序正确识别 UTF-8（记事本、某些编辑器）。BOM 对浏览器无害（浏览器会忽略 BOM）。加 BOM 的好处：Windows 记事本、Word、一些平台能更可靠地识别为 UTF-8。缺点：极少数老 PHP 系统会有问题，但对纯静态 HTML 无影响。加 BOM 是一个不错的防御措施！

   Hmm wait, but earlier my python check showed "前12字节: b'<!DOCTYPE ht'" — no BOM. Adding BOM (EF BB BF before <!DOCTYPE) helps editors/preview tools that sniff encoding. Chrome/Firefox/Edge all handle BOM fine. I think adding BOM is a good practical fix for "在网站/其他工具打开乱码" scenarios.

   Actually, let me think more carefully about whether BOM could cause issues:

   • Browsers: fine, strip it.
   • The meta charset stays too — harmless redundancy.
   • Some very old versions of PHP include issues — irrelevant here.
     So yes, add BOM.

4. Also possible: 用户说的"网站"是 WorkBuddy 的 artifact 预览？The preview in our chat showed fine (I presented it). Hmm, "在网站上打开" — maybe they published it via 发布为应用? Or opened via some URL?

Actually, let me also consider: maybe they're opening the file through a path with Chinese characters "叶宇航-个人简历" — some servers/tools mishandle non-ASCII paths → could corrupt or fail. When they download the folder and the filename/folder contains Chinese... on Windows that's fine.

One more: if they opened it via QQ/微信 transmission — 微信 sometimes downloads HTML as .txt or blocks it. QQ may open in built-in preview with wrong encoding?

I think my response should:

1. Show self-check results (file is correct; render proof)
2. Add BOM + regenerate both files as a hardening measure
3. Give clear instructions on the most common causes & fixes on their side:
   • 确认用浏览器（Chrome/Edge）打开，而不是记事本/Word/WPS
   • 如果是在线平台预览：平台解码问题，文件本身正常，本地浏览器打开即可
   • 重新下载完整文件（不要复制粘贴文本）
   • 清除缓存/强制刷新 Ctrl+F5（如果浏览器缓存了旧版本）

Let me apply the BOM fix and regenerate. Also re-verify rendering after BOM addition.

Actually hold on — should I really add BOM? Let me weigh: The <meta charset="UTF-8"> as first element in head is the standard, sufficient for all modern browsers. BOM additionally helps: Notepad (older), some text editors, some Java-based tools, some online preview services that sniff encoding. Since the user reports乱码 somewhere, BOM increases robustness of encoding detection across tools. Risk is negligible for a static HTML file. I'll add it.

Wait, one consideration: some homework platforms might do byte-level diff or strip BOM... irrelevant.

Also — I realize I should double check: is there any chance the file the user downloaded was corrupted by the download mechanism (e.g., the artifact card serving the base64-embedded 52KB file)? The screenshot render I just did proves the workspace file is fine. The user's copy may differ. I'll tell them to re-download after my fix.

Plan:

1. Python: read index-1.html (or template), add BOM, write both files with BOM ('utf-8-sig').
2. Verify: BOM present, render again quickly.
3. Reply: self-check conclusion + what I hardened + likely causes and fixes on their side.

Actually also worth checking