diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index eb96fcd26..dce2f0225 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -7256,9 +7256,38 @@ iframe.preview-frame {
   font-size: 11px;
   line-height: 1.55;
   text-align: left;
-  white-space: normal;
+  /* 文档卡预览改为"前几行"（最多 3 行），必须保留换行：折成一行就看不出结构了。 */
+  white-space: pre-line;
+  word-break: break-word;
   -webkit-box-orient: vertical;
-  -webkit-line-clamp: 5;
+  -webkit-line-clamp: 3;
+}
+
+/*
+ * 代码文件卡：不显示文件内容，只给代码图标 + 扩展名标签。
+ * 与 `.game-resource-card-version-visual` 共用同一套居中排布口径，视觉上仍是同一族卡片。
+ */
+.game-resource-card-code-visual {
+  display: grid;
+  gap: 8px;
+  width: 100%;
+  height: 100%;
+  background: linear-gradient(145deg, #fff8f1, #f2ded2);
+  color: #8b5b45;
+  /* 图标与标签作为一组整体垂直居中，与 `.game-resource-card-version-visual` 同口径。 */
+  align-content: center;
+  place-items: center;
+}
+
+.game-resource-card-code-label {
+  padding: 1px 7px;
+  border: 1px solid rgb(139 91 69 / 28%);
+  border-radius: 999px;
+  background: rgb(255 255 255 / 72%);
+  color: #8b5b45;
+  font-size: 9px;
+  font-weight: 700;
+  letter-spacing: 0.04em;
 }
 
 .game-resource-card-version-visual {
diff --git a/apps/ai-game-creator-shell/src/view/project-development/ResourcePreviewMedia.tsx b/apps/ai-game-creator-shell/src/view/project-development/ResourcePreviewMedia.tsx
index 1da6ca17c..637ab9103 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/ResourcePreviewMedia.tsx
+++ b/apps/ai-game-creator-shell/src/view/project-development/ResourcePreviewMedia.tsx
@@ -1,9 +1,10 @@
-import { Image as ImageIcon, Music2, Video } from 'lucide-react';
+import { FileCode2, Image as ImageIcon, Music2, Video } from 'lucide-react';
 import { useEffect, useRef } from 'react';
 
 import {
   projectResourceCardPreviewKind,
   type ProjectResourceCardPreviewState,
+  projectResourceCardPreviewVariant,
 } from './resourceCardPreviewModel';
 import type { ProjectResource } from './resourceProjectionModel';
 
@@ -79,6 +80,13 @@ export function ResourcePreviewMedia({
   }, [onObservePreview, previewIdentity, resource]);
 
   const kind = resource ? projectResourceCardPreviewKind(resource) : null;
+  /**
+   * 代码文件走与资源卡一致的分流：不画内容（本组件本来也只画缩略图 / 占位），
+   * 占位图标换成代码图标，免得弹窗里代码文件看起来像"读不出来的图片"。
+   */
+  const previewVariant = resource
+    ? projectResourceCardPreviewVariant(resource)
+    : null;
   const sourceUrl =
     preview.status === 'loaded' ? (preview.preview.sourceUrl ?? null) : null;
   const visual = (() => {
@@ -111,6 +119,9 @@ export function ResourcePreviewMedia({
         />
       );
     }
+    if (previewVariant === 'code') {
+      return <FileCode2 className="h-5 w-5" aria-hidden="true" />;
+    }
     return resourcePreviewPlaceholderIcon(
       kind === 'video'
         ? 'video'
diff --git a/apps/ai-game-creator-shell/src/view/project-development/index.tsx b/apps/ai-game-creator-shell/src/view/project-development/index.tsx
index 25bae8d6e..59dc4c2e5 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/index.tsx
+++ b/apps/ai-game-creator-shell/src/view/project-development/index.tsx
@@ -18,6 +18,7 @@ import { save as saveNativeFileDialog } from '@tauri-apps/plugin-dialog';
 import {
   AtSign,
   Crosshair,
+  FileCode2,
   FileText,
   FolderTree,
   Gamepad2,
@@ -291,7 +292,9 @@ import {
 import {
   projectResourceCardPreviewKind,
   type ProjectResourceCardPreviewState,
-  summarizeProjectResourceDocument,
+  projectResourceCardPreviewVariant,
+  projectResourceCodeTypeLabel,
+  projectResourceDocumentPreviewText,
 } from './resourceCardPreviewModel';
 import { ResourceClassificationPanel } from './ResourceClassificationPanel';
 import {
@@ -767,9 +770,24 @@ const ResourceCard = memo(function ResourceCard({
   const mediaActive = activeMediaIdentity === previewIdentity;
   const sourceUrl =
     preview.status === 'loaded' ? preview.preview.sourceUrl : null;
-  const documentSummary =
-    preview.status === 'loaded' && preview.preview.content !== undefined
-      ? summarizeProjectResourceDocument(preview.preview.content)
+  /**
+   * 文档类卡片的卡面分流结论（`markdown` / `code` / `plain-text` / `null`）。
+   *
+   * 判据只看路径扩展名与 subtype，**不依赖是否读到内容** —— 代码卡的卡面本就不该有内容，
+   * 等读完再决定画什么只会把"丑预览"和多余 IO 一起留在链路上。
+   */
+  const previewVariant = projectResourceCardPreviewVariant(resource);
+  /** 代码卡的类型标签（`.tsx` → `TSX`）；不是代码卡时为 `null`。 */
+  const codeTypeLabel = projectResourceCodeTypeLabel(resource.path);
+  const documentPreview =
+    preview.status === 'loaded' &&
+    preview.preview.content !== undefined &&
+    previewVariant !== null &&
+    previewVariant !== 'code'
+      ? projectResourceDocumentPreviewText(
+          preview.preview.content,
+          previewVariant === 'markdown',
+        )
       : '';
 
   useEffect(() => {
@@ -918,10 +936,31 @@ const ResourceCard = memo(function ResourceCard({
         </span>
       );
     }
-    if ((kind === 'document' || kind === 'code') && documentSummary) {
+    /**
+     * 代码文件卡：**不显示内容**，只给代码图标 + 类型标签。
+     *
+     * 这里的判据是路径分流（`previewVariant === 'code'`），与是否读到内容无关 ——
+     * 代码卡压根不发起读取（见 `useProjectResourceCardPreviews` 的入队门禁）。
+     */
+    if (previewVariant === 'code') {
       return (
-        <span className="game-resource-card-document-summary">
-          {documentSummary}
+        <span className="game-resource-card-code-visual">
+          <FileCode2 size={30} aria-hidden="true" />
+          {codeTypeLabel ? (
+            <span className="game-resource-card-code-label">
+              {codeTypeLabel}
+            </span>
+          ) : null}
+        </span>
+      );
+    }
+    if (previewVariant !== null && documentPreview) {
+      return (
+        <span
+          className="game-resource-card-document-summary"
+          data-document-preview-variant={previewVariant}
+        >
+          {documentPreview}
         </span>
       );
     }
diff --git a/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts b/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts
index 8791b8d25..2f73589f0 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/resourceCardPreviewModel.ts
@@ -211,6 +211,40 @@ const rasterImageExtension = /\.(png|jpe?g|webp)$/iu;
 const extendedImageExtension = /\.(gif|svg|avif|bmp)$/iu;
 const videoExtension = /\.(mp4|webm|mov)$/iu;
 
+/** Markdown 文档：卡面显示前几行，并做轻量标记清理。 */
+const markdownExtension = /\.(md|markdown|mdx)$/iu;
+/**
+ * 代码文件扩展名（**只看路径，不读文件内容**）。
+ *
+ * 与 `resourceProjectionModel` 的 `gameCodeExtension` 是两份口径，刻意不复用：
+ * 那份用于**筛选与归属**，改动会波及画布栏目与计数；这份只决定**卡面怎么画**。
+ * 这里按用户口径把 `.json` / `.yaml` / `.toml` / `.xml` / `.html` / `.css` / `.sql`
+ * 一并算代码 —— 它们在上游被登记成「文档」，但卡面当代码画更干净。
+ */
+const cardCodeExtension =
+  /\.(ts|tsx|mts|cts|js|jsx|mjs|cjs|rs|py|go|java|kt|kts|cs|cpp|cc|cxx|c|h|hpp|swift|php|rb|lua|sh|bash|zsh|ps1|psm1|json|jsonc|ya?ml|toml|xml|html?|css|scss|less|sql|graphql|gql|vue|svelte)$/iu;
+/** 纯文本：按纯文本处理，显示前几行但不做标记清理。 */
+const plainTextExtension = /\.(txt|text|csv|tsv|log|ini|conf|cfg|properties|env)$/iu;
+
+/**
+ * 取路径末段的扩展名（小写、不含点）。取不到（无扩展名）时返回 `null`。
+ */
+export function projectResourcePathExtension(path: string): string | null {
+  const fileName = path.split(/[\\/]/u).filter(Boolean).pop() ?? '';
+  const matched = /\.([a-z0-9]+)$/iu.exec(fileName.trim());
+  return matched ? matched[1]!.toLowerCase() : null;
+}
+
+/** 代码文件的类型标签（如 `.ts` → `TS`）；不是代码文件时返回 `null`。 */
+export function projectResourceCodeTypeLabel(path: string): string | null {
+  const trimmed = path.trim();
+  if (!cardCodeExtension.test(trimmed)) {
+    return null;
+  }
+  const extension = projectResourcePathExtension(trimmed);
+  return extension ? extension.toUpperCase() : null;
+}
+
 export function projectResourceCardPreviewKind(
   resource: ProjectResource,
 ): ProjectResourceCardPreviewKind {
@@ -220,6 +254,14 @@ export function projectResourceCardPreviewKind(
   if (resource.subtype === 'agent-result') {
     return 'document';
   }
+  // Markdown / 代码在扩展名这一层就分流，不再依赖上游登记类型：
+  // 上游把 `.json` / `.tsx` 这类文件登记成「文档」，卡面却该按代码画。
+  if (markdownExtension.test(resource.path)) {
+    return 'document';
+  }
+  if (cardCodeExtension.test(resource.path)) {
+    return 'code';
+  }
   const kind = projectResourceDisplayKind(resource);
   if (kind === 'code') {
     return 'code';
@@ -248,9 +290,56 @@ export function projectResourceCardPreviewKind(
   ) {
     return 'media-image';
   }
+  // 纯文本兜底：`.txt` / `.csv` / `.log` 这类文件在上游没有类型结论（判成 `null`），
+  // 卡面按纯文本预览比占位图标更有信息量。放在最后，不改动任何已有分支的结论。
+  if (kind === null && plainTextExtension.test(resource.path)) {
+    return 'document';
+  }
   return 'placeholder';
 }
 
+/**
+ * 文档类卡片（`document` / `code`）的卡面分流结论。
+ *
+ * 三种落点：
+ * - `markdown`：显示前几行，预览前做轻量标记清理；
+ * - `code`：**完全不读内容**，卡面改画代码图标 + 类型标签；
+ * - `plain-text`：显示前几行，不做标记清理。
+ */
+export type ProjectResourceCardPreviewVariant =
+  | 'markdown'
+  | 'code'
+  | 'plain-text'
+  | null;
+
+export function projectResourceCardPreviewVariant(
+  resource: ProjectResource,
+): ProjectResourceCardPreviewVariant {
+  if (resource.subtype === 'agent-result') {
+    return 'markdown';
+  }
+  if (markdownExtension.test(resource.path)) {
+    return 'markdown';
+  }
+  if (cardCodeExtension.test(resource.path)) {
+    return 'code';
+  }
+  return projectResourceCardPreviewKind(resource) === 'document'
+    ? 'plain-text'
+    : null;
+}
+
+/**
+ * 代码卡**不做文件读取**的判据：卡面只用路径画图标，读内容既无用又占读取槽。
+ *
+ * 与 `projectResourceCardPreviewVariant` 同源，避免"卡面不画内容、却仍在后台读内容"的分叉。
+ */
+export function projectResourceCardPreviewReadsContent(
+  resource: ProjectResource,
+): boolean {
+  return projectResourceCardPreviewVariant(resource) !== 'code';
+}
+
 /**
  * `read_local_project_media_preview` 的线上 `category` 入参：只按文件类型分美术 / 音频两支。
  *
@@ -284,14 +373,63 @@ export function projectResourceCardPreviewIdentity(input: {
   ]);
 }
 
-export function summarizeProjectResourceDocument(content: string) {
+/** 卡面文档预览的最大行数（超出由 CSS 省略号截断）。 */
+export const PROJECT_RESOURCE_CARD_PREVIEW_LINE_LIMIT = 3;
+/** 单行预览的最大字符数，超出截断成省略号。 */
+export const PROJECT_RESOURCE_CARD_PREVIEW_LINE_LENGTH = 72;
+
+/**
+ * Markdown 的**轻量**清理：只去掉标记符号，不是渲染器。
+ *
+ * - 去掉围栏标记行（``` / ~~~），保留代码内容本身；
+ * - 去掉行首标题 `#`、引用 `>` 与列表符号（保留缩进层级）；
+ * - 去掉强调 / 行内代码 / 图片 / 链接的标记符号，保留可见文字；
+ * - **不折叠换行** —— 卡面要的是"前几行"，压成一行就看不出结构了。
+ */
+function stripMarkdownMarkers(content: string): string {
   return content
-    .replace(/!\[[^\]]*\]\([^)]*\)/gu, ' ')
+    .replace(/^\s*(?:```|~~~).*$/gmu, '')
+    .replace(/^\s{0,3}#{1,6}\s*/gmu, '')
+    .replace(/^\s{0,3}>\s?/gmu, '')
+    .replace(/^\s*[-+*]\s+/gmu, '')
+    .replace(/!\[([^\]]*)\]\([^)]*\)/gu, '$1')
     .replace(/\[([^\]]+)\]\([^)]*\)/gu, '$1')
-    .replace(/<[^>]*>/gu, ' ')
-    .replace(/[`*_~>#|{}[\]]/gu, ' ')
-    .replace(/^\s*[-+]\s+/gmu, '')
-    .replace(/\s+/gu, ' ')
-    .trim()
-    .slice(0, 180);
+    .replace(/`{1,3}([^`]*)`{1,3}/gu, '$1')
+    .replace(/\*\*([^*]+)\*\*/gu, '$1')
+    .replace(/__([^_]+)__/gu, '$1')
+    .replace(/(^|[^*])\*([^*\n]+)\*/gu, '$1$2')
+    .replace(/(^|[^_])_([^_\n]+)_/gu, '$1$2');
+}
+
+/**
+ * 文档卡面的前几行预览文本。
+ *
+ * `isMarkdown` 为 `true` 时先做轻量标记清理；纯文本原样输出。
+ * 逐行去掉多余空白（缩进保留最多 2 个空格）并按 `PROJECT_RESOURCE_CARD_PREVIEW_LINE_LENGTH`
+ * 单行截断，最多取 `PROJECT_RESOURCE_CARD_PREVIEW_LINE_LIMIT` 行。
+ */
+export function projectResourceDocumentPreviewText(
+  content: string,
+  isMarkdown: boolean,
+): string {
+  const normalized = isMarkdown ? stripMarkdownMarkers(content) : content;
+  const lines: string[] = [];
+  for (const rawLine of normalized.split(/\r?\n/u)) {
+    const line = rawLine.replace(/\t/gu, '  ').replace(/\s+$/u, '');
+    const trimmed = line.trimStart();
+    if (!trimmed) {
+      continue;
+    }
+    const indent = line.slice(0, line.length - trimmed.length).slice(0, 2);
+    const text = `${indent}${trimmed}`;
+    lines.push(
+      text.length > PROJECT_RESOURCE_CARD_PREVIEW_LINE_LENGTH
+        ? `${text.slice(0, PROJECT_RESOURCE_CARD_PREVIEW_LINE_LENGTH)}…`
+        : text,
+    );
+    if (lines.length >= PROJECT_RESOURCE_CARD_PREVIEW_LINE_LIMIT) {
+      break;
+    }
+  }
+  return lines.join('\n');
 }
diff --git a/apps/ai-game-creator-shell/src/view/project-development/useProjectResourceCardPreviews.ts b/apps/ai-game-creator-shell/src/view/project-development/useProjectResourceCardPreviews.ts
index 06309ad28..fffa0bd38 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/useProjectResourceCardPreviews.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/useProjectResourceCardPreviews.ts
@@ -26,6 +26,7 @@ import {
   projectResourceCardPreviewImageDimensions,
   type ProjectResourceCardPreviewKind,
   projectResourceCardPreviewKind,
+  projectResourceCardPreviewReadsContent,
   type ProjectResourceCardPreviewPayload,
   type ProjectResourceCardPreviewState,
   type ProjectResourceCardPreviewTransportPayload,
@@ -491,10 +492,12 @@ export function useProjectResourceCardPreviews(input: {
       job: PreviewJob,
     ): Promise<ProjectResourceCardPreviewTransportPayload> => {
       const kind = projectResourceCardPreviewKind(job.resource);
-      if (
-        (kind === 'document' || kind === 'code') &&
-        job.resource.content !== undefined
-      ) {
+      /**
+       * 这段之前的 `kind === 'document' || kind === 'code'` 双分支已收窄：代码卡在
+       * `requestPreview` 的入队门禁就被挡下（**判据同源**，见 `projectResourceCardPreviewReadsContent`），
+       * 走到这里的只可能是需要读内容的文档卡（Markdown / 纯文本）。
+       */
+      if (job.resource.content !== undefined) {
         return {
           path: job.resource.path,
           mediaType: job.resource.mediaType,
@@ -505,7 +508,7 @@ export function useProjectResourceCardPreviews(input: {
       const invoke = window.__TAURI__?.core?.invoke;
       if (!invoke) {
         throw new Error(
-          kind === 'document' || kind === 'code'
+          kind === 'document'
             ? '文档预览需要在客户端内打开'
             : '媒体预览需要在客户端内打开',
         );
@@ -633,6 +636,18 @@ export function useProjectResourceCardPreviews(input: {
         return;
       }
       const kind = projectResourceCardPreviewKind(resource);
+      /**
+       * 代码卡**不入队列、不读内容**：卡面只用路径画图标 + 类型标签，读回来的内容没有任何
+       * 消费方。此前代码卡与文档卡走同一条读取分支，读回一大段源码再被折成一行摘要 ——
+       * 既是"丑预览"的来源，也白占全局 3 个读取槽。
+       *
+       * 判据与卡面分流（`projectResourceCardPreviewVariant`）同源，避免"卡面不画内容、
+       * 后台仍在读内容"的分叉。这里直接 `return` 而不是入队后失败：卡停在 `idle`，
+       * 卡面照常画代码图标，不产生误导性的失败态。
+       */
+      if (!projectResourceCardPreviewReadsContent(resource)) {
+        return;
+      }
       if (
         kind === 'version' ||
         kind === 'placeholder' ||