diff --git a/handlers/bind.py b/handlers/bind.py
index 66eb7c4..84b1f9b 100644
--- a/handlers/bind.py
+++ b/handlers/bind.py
@@ -24,7 +24,6 @@ async def cmd_bind(update: Update, context: ContextTypes.DEFAULT_TYPE):
             f"📅 绑定时间: {existing['bound_at']}\n\n"
             f"如需重新绑定，先 /unbind"
         )
-        asyncio.create_task(auto_delete(update.message))
         asyncio.create_task(auto_delete(reply))
         return
 
@@ -35,7 +34,6 @@ async def cmd_bind(update: Update, context: ContextTypes.DEFAULT_TYPE):
         f"请点击以下链接完成绑定：\n{url}\n\n"
         "⏳ 链接 5 分钟内有效"
     )
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply, seconds=120))
 
 
@@ -48,7 +46,6 @@ async def cmd_unbind(update: Update, context: ContextTypes.DEFAULT_TYPE):
         await Action.create(action="UNBIND", user_id=user.id, username=user.username)
     else:
         reply = await update.message.reply_text("❌ 你没有绑定的账号")
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply))
 
 
diff --git a/handlers/fun.py b/handlers/fun.py
index 9ba63e6..3a11278 100644
--- a/handlers/fun.py
+++ b/handlers/fun.py
@@ -55,7 +55,6 @@ async def cmd_checkin(update: Update, context: ContextTypes.DEFAULT_TYPE):
         )
     else:
         reply = await update.message.reply_text("❌ 你今天已经签到过了")
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply))
 
 
@@ -69,7 +68,6 @@ async def cmd_trivia(update: Update, context: ContextTypes.DEFAULT_TYPE):
     context.user_data["trivia_answer"] = q["a"]
     context.user_data["trivia_options"] = q["opts"]
     reply = await update.message.reply_text(text)
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply))
 
 
@@ -85,7 +83,6 @@ async def cmd_score(update: Update, context: ContextTypes.DEFAULT_TYPE):
         for s in scores:
             text += f"🎮 {s.game_type}: {s.score} 分 (胜率 {s.wins}/{s.total})\n"
         reply = await update.message.reply_text(text)
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply))
 
 
@@ -101,7 +98,6 @@ async def cmd_rank(update: Update, context: ContextTypes.DEFAULT_TYPE):
             medal = medals[i] if i < 3 else f" {i+1}."
             text += f"{medal} @{s.username or s.user_id} — {s.score} 分\n"
         reply = await update.message.reply_text(text)
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply))
 
 
diff --git a/handlers/knowledge.py b/handlers/knowledge.py
index 24afa18..7aab7ab 100644
--- a/handlers/knowledge.py
+++ b/handlers/knowledge.py
@@ -1,5 +1,6 @@
 """知识库问答 handler"""
 import asyncio
+import html
 import logging
 import re
 
@@ -26,10 +27,23 @@ def optimize_plain_answer(text: str) -> str:
     return "*回答*\n" + "\n".join(f"- {line}" if not line.startswith(("-", "•", "✅", "⚠️", "📚")) else line for line in lines)
 
 
-def telegram_markdown(text: str) -> str:
-    """把常见 Markdown 调整为 Telegram legacy Markdown 更容易接受的形式。"""
-    text = re.sub(r"\*\*([^*]+)\*\*", r"*\1*", text)
-    text = re.sub(r"^#{1,3}\s+(.+)$", r"*\1*", text, flags=re.MULTILINE)
+def markdown_to_html(text: str) -> str:
+    """把常见 Markdown 转成 Telegram HTML，规避 Markdown 解析器对 _/链接/长文本的误判。"""
+    code_blocks: list[str] = []
+
+    def stash_code_block(match: re.Match) -> str:
+        code = html.escape(match.group(1).strip())
+        code_blocks.append(f"<pre><code>{code}</code></pre>")
+        return f"@@CODE_BLOCK_{len(code_blocks) - 1}@@"
+
+    text = re.sub(r"```(?:\w+)?\n?(.*?)```", stash_code_block, text, flags=re.S)
+    text = html.escape(text)
+    text = re.sub(r"^#{1,3}\s+(.+)$", r"<b>\1</b>", text, flags=re.M)
+    text = re.sub(r"\*\*([^*\n]+)\*\*", r"<b>\1</b>", text)
+    text = re.sub(r"(?<!\*)\*([^*\n]+)\*(?!\*)", r"<b>\1</b>", text)
+    text = re.sub(r"`([^`\n]+)`", r"<code>\1</code>", text)
+    for i, block in enumerate(code_blocks):
+        text = text.replace(f"@@CODE_BLOCK_{i}@@", block)
     return text
 
 
@@ -70,28 +84,21 @@ def split_answer(text: str, max_len: int = 3900, max_parts: int = 2) -> list[str
 
 
 async def safe_send(update: Update, context: ContextTypes.DEFAULT_TYPE, text: str, markdown: bool | None = None):
-    """优先回复原消息；Markdown 失败或原消息被删时自动降级。"""
+    """优先回复原消息；Markdown 内容转 HTML 发送，失败自动降级纯文本。"""
     chat_id = update.effective_chat.id
-    use_markdown = looks_like_markdown(text) if markdown is None else markdown
-    send_text = telegram_markdown(text) if use_markdown else text
+    use_markup = looks_like_markdown(text) if markdown is None else markdown
+    send_text = markdown_to_html(text) if use_markup else text
 
-    async def _send_plain():
+    if use_markup:
         try:
-            return await update.message.reply_text(text)
-        except Exception:
-            return await context.bot.send_message(chat_id=chat_id, text=text)
-
-    if use_markdown:
-        try:
-            return await update.message.reply_text(send_text, parse_mode="Markdown", disable_web_page_preview=True)
+            return await update.message.reply_text(send_text, parse_mode="HTML", disable_web_page_preview=True)
         except Exception as e:
             if "Message to be replied not found" in str(e):
                 try:
-                    return await context.bot.send_message(chat_id=chat_id, text=send_text, parse_mode="Markdown", disable_web_page_preview=True)
+                    return await context.bot.send_message(chat_id=chat_id, text=send_text, parse_mode="HTML", disable_web_page_preview=True)
                 except Exception:
-                    return await context.bot.send_message(chat_id=chat_id, text=text)
-            logger.warning(f"Markdown 发送失败，降级普通文本: {e}")
-            return await _send_plain()
+                    return await context.bot.send_message(chat_id=chat_id, text=text, disable_web_page_preview=True)
+            logger.warning(f"HTML 格式发送失败，降级普通文本: {e}")
 
     try:
         return await update.message.reply_text(text, disable_web_page_preview=True)
@@ -110,13 +117,11 @@ async def cmd_ask(update: Update, context: ContextTypes.DEFAULT_TYPE):
             "例如: /ask 怎么安装收割机\n"
             f"文档地址: {config.SITE_URL}"
         )
-        asyncio.create_task(auto_delete(update.message, seconds=180))
         asyncio.create_task(auto_delete(reply, seconds=180))
         return
 
     logger.info(f"📩 用户提问: [{update.message.from_user.username}] {query}")
     searching_msg = await safe_send(update, context, "🔍 正在搜索知识库并整理详细答案...")
-    asyncio.create_task(auto_delete(update.message, seconds=180))
 
     try:
         from services.knowledge_base import ask_knowledge_base
diff --git a/handlers/night_mode.py b/handlers/night_mode.py
index fb82c79..8b3b977 100644
--- a/handlers/night_mode.py
+++ b/handlers/night_mode.py
@@ -25,7 +25,6 @@ async def cmd_night(update: Update, context: ContextTypes.DEFAULT_TYPE):
             "/night on  开启\n"
             "/night off  关闭"
         )
-        asyncio.create_task(auto_delete(update.message))
         return
 
     cmd = args[0].lower()
@@ -38,7 +37,6 @@ async def cmd_night(update: Update, context: ContextTypes.DEFAULT_TYPE):
     else:
         reply = await update.message.reply_text("❓ 用法: /night on|off")
 
-    asyncio.create_task(auto_delete(update.message))
     asyncio.create_task(auto_delete(reply))