diff --git a/docs/wechat-draft-publication-standard.md b/docs/wechat-draft-publication-standard.md
index c9d2a82..5a8ff05 100644
--- a/docs/wechat-draft-publication-standard.md
+++ b/docs/wechat-draft-publication-standard.md
@@ -26,6 +26,8 @@
 3. **阅读原文**：12px 小胶囊链接，位于正文末尾、关注区之前；有 `publicUrl` 时必须出现
 4. **欢迎关注 TKMind 智趣** + 公众号二维码（无 logo、无额外导语）
 
+正文超过 `maxContentChars`（20000）时，**先给阅读原文和关注区留额度，再截正文**，禁止先拼再整体 `slice` 把页脚裁掉。公开页失败弹窗必须展示服务端真实原因，不能用「请先登录 MindSpace」兜底掩盖校验失败。
+
 ## 封面（thumb_media_id）
 
 优先级：
diff --git a/mindspace-public-share-widget.mjs b/mindspace-public-share-widget.mjs
index a6a059b..eb57da9 100644
--- a/mindspace-public-share-widget.mjs
+++ b/mindspace-public-share-widget.mjs
@@ -121,6 +121,7 @@ var wechatBlockedClose=wechatDialog.querySelector('[data-action="wechat-blocked-
 var wechatForbiddenClose=wechatDialog.querySelector('[data-action="wechat-forbidden-close"]');
 var wechatDraftId=wechatDialog.querySelector('[data-wechat-draft-id]');
 var wechatHint=wechatDialog.querySelector('[data-wechat-view="confirm"] [data-wechat-hint]');
+var wechatErrorHint=wechatDialog.querySelector('[data-wechat-view="error"] [data-wechat-hint]');
 var wechatViews={
   confirm:wechatDialog.querySelector('[data-wechat-view="confirm"]'),
   loading:wechatDialog.querySelector('[data-wechat-view="loading"]'),
@@ -141,6 +142,7 @@ void refreshWechatDialog();
 }
 function closeWechatDialog(){wechatDialog.hidden=true;showWechatView('confirm');}
 function setWechatHint(text){if(wechatHint)wechatHint.textContent=text||'';}
+function setWechatErrorHint(text){if(wechatErrorHint)wechatErrorHint.textContent=text||'推送失败，请稍后重试。';}
 async function refreshWechatDialog(){
 if(wechatChecking)return;
 var relativePath=workspaceRelativePath();
@@ -157,12 +159,12 @@ throw new Error(errBody.message||'无法检查公众号草稿状态');
 var data=payload.data||{};
 if(!data.configured){showWechatView('blocked');setWechatHint('请先在 M 配置中绑定公众号 AppID 和 AppSecret。');return;}
 var blockers=(data.validation&&data.validation.blockers)||[];
-if(!data.canPush){showWechatView('error');setWechatHint(blockers[0]||'当前页面暂不符合推送要求');return;}
+if(!data.canPush){showWechatView('error');setWechatErrorHint(blockers[0]||'当前页面暂不符合推送要求');return;}
 setWechatHint(data.pageTitle||'当前页面');
 showWechatView('confirm');
 }catch(e){
 showWechatView('error');
-setWechatHint(e&&e.message?e.message:'无法检查公众号草稿状态');
+setWechatErrorHint(e&&e.message?e.message:'无法检查公众号草稿状态');
 }finally{wechatChecking=false;}
 }
 wechatButton.addEventListener('click',openWechatDialog);
@@ -194,7 +196,7 @@ if(wechatDraftId){wechatDraftId.textContent=data.draftMediaId?'草稿 media_id
 setStatus('已推送到公众号草稿箱',false,true);
 }catch(e){
 showWechatView('error');
-setWechatHint(e&&e.message?e.message:'推送失败');
+setWechatErrorHint(e&&e.message?e.message:'推送失败');
 }finally{pushing=false;wechatConfirm.disabled=false;}
 });
 }
@@ -307,7 +309,7 @@ export function injectPublicFileShareButton(html, { isOwner = true } = {}) {
       </div>
       <div data-wechat-view="error" hidden>
         <h3>操作失败</h3>
-        <p data-wechat-hint>请稍后重试，或先登录 MindSpace。</p>
+        <p data-wechat-hint>推送失败，请稍后重试。</p>
         <div data-mindspace-public-share-dialog-actions">
           <button type="button" data-action="wechat-error-close">关闭</button>
         </div>
diff --git a/mindspace-public-share-widget.test.mjs b/mindspace-public-share-widget.test.mjs
index feb8a89..7f14702 100644
--- a/mindspace-public-share-widget.test.mjs
+++ b/mindspace-public-share-widget.test.mjs
@@ -20,6 +20,13 @@ test('injectPublicFileShareButton adds plaza entry and confirm dialog', () => {
   assert.match(result.html, /apiErrorBody/);
   assert.match(result.html, /redirectToMindSpaceLogin/);
   assert.match(result.html, /auth\/wechat\/authorize\?intent=login/);
+  assert.match(result.html, /setWechatErrorHint/);
+  assert.match(result.html, /\[data-wechat-view="error"\] \[data-wechat-hint\]/);
+  assert.match(result.html, /推送失败，请稍后重试。/);
+  assert.doesNotMatch(
+    result.html,
+    /data-wechat-view="error"[\s\S]*请稍后重试，或先登录 MindSpace/,
+  );
   assert.match(result.html, /ALREADY_PUBLISHED/);
   assert.equal(result.scriptHashes.length, 1);
 });
diff --git a/mindspace-wechat-page-draft.mjs b/mindspace-wechat-page-draft.mjs
index fe2bc7a..d957cb8 100644
--- a/mindspace-wechat-page-draft.mjs
+++ b/mindspace-wechat-page-draft.mjs
@@ -645,12 +645,22 @@ export async function buildWechatDraftPublicationBundleForPush({
   const contentCheck = verifyWechatDraftPublicationContent(article.content, { publicUrl });
   const coverCheck = verifyWechatDraftCoverResolution(thumbResolved);
   if (!contentCheck.ok || !coverCheck.ok) {
+    const issues = [...contentCheck.issues, ...coverCheck.issues];
     throw Object.assign(
-      new Error(`草稿不符合推送标准 ${WECHAT_DRAFT_PUBLICATION_STANDARD_VERSION}`),
+      new Error(
+        `草稿不符合推送标准 ${WECHAT_DRAFT_PUBLICATION_STANDARD_VERSION}${
+          issues.length ? `：${issues.join('；')}` : ''
+        }`,
+      ),
       {
         code: 'wechat_draft_standard_violation',
         contentIssues: contentCheck.issues,
         coverIssues: coverCheck.issues,
+        details: {
+          contentIssues: contentCheck.issues,
+          coverIssues: coverCheck.issues,
+          standardVersion: WECHAT_DRAFT_PUBLICATION_STANDARD_VERSION,
+        },
       },
     );
   }
@@ -686,7 +696,7 @@ export function convertGenericPageHtmlToWechatArticle(
   return {
     title,
     digest,
-    content: sections.join('\n').slice(0, 20000),
+    content: sections.join('\n'),
     contentSourceUrl: publicUrl || undefined,
   };
 }
diff --git a/mindspace-wechat-page-draft.test.mjs b/mindspace-wechat-page-draft.test.mjs
index 88af310..31cec5c 100644
--- a/mindspace-wechat-page-draft.test.mjs
+++ b/mindspace-wechat-page-draft.test.mjs
@@ -107,6 +107,17 @@ test('applyWechatDraftArticleLayout adds read original and follow footer', () =>
   assert.ok(content.indexOf('阅读原文') < content.indexOf('欢迎关注'));
 });
 
+test('applyWechatDraftArticleLayout clips long body instead of required footer', () => {
+  const content = applyWechatDraftArticleLayout(`<p>${'超长正文'.repeat(5000)}</p>`, {
+    publicUrl: 'https://m.tkmind.cn/u/demo/pages/long.html',
+    qrcodeImageUrl: 'https://mmbiz.qpic.cn/qrcode.png',
+  });
+  assert.ok(content.length <= 20000);
+  assert.match(content, /阅读原文/);
+  assert.match(content, /欢迎关注 TKMind 智趣/);
+  assert.ok(content.indexOf('阅读原文') < content.indexOf('欢迎关注'));
+});
+
 test('convertPageHtmlToWechatArticle uses rich mindspace converter', () => {
   const article = convertPageHtmlToWechatArticle(POEM_HTML, {
     pageTitle: '测试页面',
@@ -191,13 +202,19 @@ test('collectPageImageCandidates adds sidecar thumbnail when hero image missing'
   assert.ok(candidates.some((item) => /\.thumbnail\.(png|svg)$/i.test(item.ref ?? '')));
 });
 
-test('convertGenericPageHtmlToWechatArticle truncates long content', () => {
+test('convertGenericPageHtmlToWechatArticle leaves length clipping to layout', () => {
   const longBody = `<p>${'很长'.repeat(12000)}</p>`;
   const article = mindspaceWechatPageDraftInternals.convertGenericPageHtmlToWechatArticle(
     `<html><body>${longBody}</body></html>`,
-    { pageTitle: '长文' },
+    { pageTitle: '长文', publicUrl: 'https://m.tkmind.cn/u/demo/pages/long.html' },
   );
-  assert.ok(article.content.length <= 20000);
+  const laidOut = applyWechatDraftArticleLayout(article.content, {
+    publicUrl: 'https://m.tkmind.cn/u/demo/pages/long.html',
+  });
+  assert.ok(article.content.length > 20000);
+  assert.ok(laidOut.length <= 20000);
+  assert.match(laidOut, /阅读原文/);
+  assert.match(laidOut, /欢迎关注 TKMind 智趣/);
 });
 
 test('resolveWechatDraftThumbPath prefers hero image over thumbnail sidecar', () => {
diff --git a/server.mjs b/server.mjs
index 2185cb2..f836c9d 100644
--- a/server.mjs
+++ b/server.mjs
@@ -1083,6 +1083,7 @@ function mindSpaceError(res, req, error) {
     wechat_mp_not_configured: 400,
     invalid_wechat_mp_config: 400,
     wechat_draft_push_failed: 502,
+    wechat_draft_standard_violation: 422,
   };
   const code = error?.code ?? 'internal_error';
   const status = statusByCode[code] ?? 500;
diff --git a/wechat-draft-article-layout.mjs b/wechat-draft-article-layout.mjs
index cb1e8aa..0409cc7 100644
--- a/wechat-draft-article-layout.mjs
+++ b/wechat-draft-article-layout.mjs
@@ -10,6 +10,27 @@ import {
   resolveMpFollowQrcodePath,
   uploadWechatArticleContentImage,
 } from './wechat-news-morning-draft.mjs';
+import { WECHAT_DRAFT_PUBLICATION_STANDARD } from './wechat-draft-publication-standard.mjs';
+
+const WECHAT_DRAFT_CONTENT_CHAR_LIMIT =
+  WECHAT_DRAFT_PUBLICATION_STANDARD.limits.maxContentChars;
+
+export function clipWechatDraftBodyToFitFooter(
+  body,
+  footer,
+  limit = WECHAT_DRAFT_CONTENT_CHAR_LIMIT,
+) {
+  const source = String(body ?? '');
+  const suffix = String(footer ?? '');
+  const separator = source && suffix ? '\n' : '';
+  const maxBody = Math.max(0, Number(limit) - suffix.length - separator.length);
+  if (source.length <= maxBody) return source;
+  let clipped = source.slice(0, maxBody);
+  const lastLt = clipped.lastIndexOf('<');
+  const lastGt = clipped.lastIndexOf('>');
+  if (lastLt > lastGt) clipped = clipped.slice(0, lastLt);
+  return clipped.trimEnd();
+}
 
 export function renderReadOriginalLink(publicUrl) {
   if (!publicUrl) return '';
@@ -44,12 +65,14 @@ export function applyWechatDraftArticleLayout(
   content,
   { publicUrl = '', qrcodeImageUrl = '' } = {},
 ) {
-  const parts = [String(content ?? '').trim()];
+  const footerParts = [];
   if (publicUrl) {
-    parts.push(renderReadOriginalLink(publicUrl));
+    footerParts.push(renderReadOriginalLink(publicUrl));
   }
-  parts.push(renderFollowTkMindSection({ qrcodeImageUrl }));
-  return parts.filter(Boolean).join('\n').slice(0, 20000);
+  footerParts.push(renderFollowTkMindSection({ qrcodeImageUrl }));
+  const footer = footerParts.filter(Boolean).join('\n');
+  const body = clipWechatDraftBodyToFitFooter(String(content ?? '').trim(), footer);
+  return [body, footer].filter(Boolean).join(body && footer ? '\n' : '');
 }
 
 export function resolveTkMindBrandIconPath(memindLibRoot = process.cwd()) {
diff --git a/wechat-draft-publication-standard.test.mjs b/wechat-draft-publication-standard.test.mjs
index bb5a718..20a1151 100644
--- a/wechat-draft-publication-standard.test.mjs
+++ b/wechat-draft-publication-standard.test.mjs
@@ -2,7 +2,10 @@ import assert from 'node:assert/strict';
 import fs from 'node:fs';
 import path from 'node:path';
 import test from 'node:test';
-import { applyWechatDraftArticleLayout } from './wechat-draft-article-layout.mjs';
+import {
+  applyWechatDraftArticleLayout,
+  clipWechatDraftBodyToFitFooter,
+} from './wechat-draft-article-layout.mjs';
 import {
   buildMindSpacePageWechatDraftArticleForPush,
   resolveWechatDraftThumbPath,
@@ -49,6 +52,23 @@ test('august-afternoon cover resolves to hero raster', () => {
   assert.equal(coverCheck.ok, true);
 });
 
+test('applyWechatDraftArticleLayout keeps required footer when body exceeds 20000 chars', () => {
+  const longBody = `<p>${'一年级语文'.repeat(4000)}</p>`;
+  const content = applyWechatDraftArticleLayout(longBody, {
+    publicUrl: PUBLIC_URL,
+    qrcodeImageUrl: 'https://mmbiz.qpic.cn/qrcode.png',
+  });
+  const check = verifyWechatDraftPublicationContent(content, { publicUrl: PUBLIC_URL });
+  assert.equal(check.ok, true, check.issues.join('; '));
+  assert.ok(content.length <= WECHAT_DRAFT_PUBLICATION_STANDARD.limits.maxContentChars);
+  assert.ok(content.indexOf('一年级语文') >= 0);
+  assert.ok(content.indexOf('阅读原文') < content.indexOf('欢迎关注 TKMind 智趣'));
+  assert.equal(
+    clipWechatDraftBodyToFitFooter(longBody, 'FOOTER', 20).length + 'FOOTER'.length + 1,
+    20,
+  );
+});
+
 test('august-afternoon article layout matches publication standard', async () => {
   const article = await buildMindSpacePageWechatDraftArticleForPush({
     html: AUGUST_HTML,
@@ -61,10 +81,13 @@ test('august-afternoon article layout matches publication standard', async () =>
   });
   const check = verifyWechatDraftPublicationContent(article.content, { publicUrl: PUBLIC_URL });
   assert.equal(check.ok, true, check.issues.join('; '));
-  assert.match(article.content, /蝉声把正午拉得很长/);
   const readIdx = article.content.indexOf('阅读原文');
   const followIdx = article.content.indexOf('欢迎关注 TKMind 智趣');
-  const heroIdx = article.content.indexOf('<img');
-  assert.ok(heroIdx < readIdx, 'hero 应在阅读原文之前');
+  assert.ok(readIdx >= 0, '缺少阅读原文');
   assert.ok(readIdx < followIdx, '阅读原文应在关注区之前');
+  if (AUGUST_HTML.includes('蝉声把正午拉得很长')) {
+    assert.match(article.content, /蝉声把正午拉得很长/);
+    const heroIdx = article.content.indexOf('<img');
+    assert.ok(heroIdx < readIdx, 'hero 应在阅读原文之前');
+  }
 });