diff --git a/packages/client/src/components/hermes/chat/MarkdownRenderer.vue b/packages/client/src/components/hermes/chat/MarkdownRenderer.vue
index 85421e0..5f586ca 100644
--- a/packages/client/src/components/hermes/chat/MarkdownRenderer.vue
+++ b/packages/client/src/components/hermes/chat/MarkdownRenderer.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { computed, nextTick, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
-import { NDrawer, NSpin, useMessage } from 'naive-ui'
+import { NDrawer, NDrawerContent, NSpin, useMessage } from 'naive-ui'
 import type MarkdownIt from 'markdown-it'
 import MarkdownItConstructor from 'markdown-it'
 import { handleCodeBlockCopyClick, renderHighlightedCodeBlock } from './highlight'
@@ -17,7 +17,7 @@ import {
 } from './mermaidRenderer'
 import { downloadFile, getDownloadUrl, fetchFileText } from '@/api/hermes/download'
 
-const PREVIEW_AREA_WIDTH = 500
+const PREVIEW_AREA_WIDTH = 'min(800px, 100vw)'
 
 const props = withDefaults(defineProps<{
     content: string
@@ -62,9 +62,12 @@ const previewUrl = ref<string | null>(null)
 
 // Preview config variable
 const textPreviewContent = ref<string | null>(null)
+const textPreviewFileName = ref('')
 const textPreviewLoading = ref(false)
 const textPreviewVisible = ref(false)
 
+const textPreviewIsMarkdown = computed(() => /\.(md|markdown)$/i.test(textPreviewFileName.value))
+
 let renderGeneration = 0
 let unmounted = false
 
@@ -137,11 +140,13 @@ const renderedHtml = computed(() => {
         <polyline points="14 2 14 8 20 8" />
       </svg>
       <span class="att-name">${fileName}</span>
-      <svg class="att-download-icon" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-        <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
-        <polyline points="7 10 12 15 17 10" />
-        <line x1="12" y1="15" x2="12" y2="3" />
-      </svg>
+      <button class="att-download-btn" type="button" title="${t('download.downloadFile')}" aria-label="${t('download.downloadFile')}">
+        <svg class="att-download-icon" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
+          <polyline points="7 10 12 15 17 10" />
+          <line x1="12" y1="15" x2="12" y2="3" />
+        </svg>
+      </button>
     </div>`
   })
 
@@ -316,24 +321,24 @@ async function handleMarkdownClick(event: MouseEvent): Promise<void> {
     event.preventDefault()
     event.stopPropagation()
     const path = fileCard.getAttribute('data-path')
-    const fileName = fileCard.getAttribute('data-filename')
+    const fileName = fileCard.getAttribute('data-filename') || undefined
 
     const isDownloadBtn = target.closest('.att-download-btn')
 
     if (isDownloadBtn && path) { // Only download file with download icon clicked.
       message.info(t('download.downloading'))
-      downloadFile(path, fileName || undefined).catch((err: Error) => {
+      downloadFile(path, fileName).catch((err: Error) => {
         message.error(err.message || t('download.downloadFailed'))
       })
       return
     }
 
     if (path) {
-      const ext = fileName.split('.').pop()?.toLowerCase()
+      const ext = fileName?.split('.').pop()?.toLowerCase()
       if (SUPPORT_PREVIEW_FILE_TYPES.includes(ext || '')) {
-        previewTextFile(path, fileName)
+        previewTextFile(path, fileName || '')
       } else { // Download file immediately
-        downloadFile(path, fileName || undefined).catch((err: Error) => {
+        downloadFile(path, fileName).catch((err: Error) => {
           message.error(err.message || t('download.downloadFailed'))
         })
       }
@@ -389,6 +394,8 @@ async function handleMarkdownClick(event: MouseEvent): Promise<void> {
 async function previewTextFile(path: string, fileName: string): Promise<void> {
   textPreviewLoading.value = true
   textPreviewVisible.value = true
+  textPreviewFileName.value = fileName
+  textPreviewContent.value = null
   try {
     textPreviewContent.value = await fetchFileText(path, fileName)
   } catch (err: any) {
@@ -397,6 +404,10 @@ async function previewTextFile(path: string, fileName: string): Promise<void> {
     textPreviewLoading.value = false
   }
 }
+
+function closeTextPreview(): void {
+  textPreviewVisible.value = false
+}
 </script>
 
 <template>
@@ -408,13 +419,21 @@ async function previewTextFile(path: string, fileName: string): Promise<void> {
     placement="right"
     :show-mask="false"
     :trap-focus="false"
+    class="markdown-text-preview-drawer"
   >
-    <template #header>
-      📄 {{ t('download.preview') }}
-    </template>
-    <NSpin :show="textPreviewLoading">
-      <pre v-if="textPreviewContent !== null" class="text-preview-body">{{ textPreviewContent }}</pre>
-    </NSpin>
+    <NDrawerContent
+      :title="t('download.contentDisplay')"
+      closable
+      :body-content-style="{ padding: 0 }"
+      @close="closeTextPreview"
+    >
+      <NSpin :show="textPreviewLoading">
+        <div v-if="textPreviewContent !== null && textPreviewIsMarkdown" class="text-preview-markdown">
+          <MarkdownRenderer :content="textPreviewContent" />
+        </div>
+        <pre v-else-if="textPreviewContent !== null" class="text-preview-body">{{ textPreviewContent }}</pre>
+      </NSpin>
+    </NDrawerContent>
   </NDrawer>
   <Teleport to="body">
     <div v-if="previewUrl" class="image-preview-overlay" @click.self="previewUrl = null">
@@ -545,7 +564,22 @@ async function previewTextFile(path: string, fileName: string): Promise<void> {
       transition: opacity 0.15s ease;
     }
 
-    &:hover .att-download-icon {
+    .att-download-btn {
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
+      flex-shrink: 0;
+      width: 18px;
+      height: 18px;
+      padding: 0;
+      color: inherit;
+      background: transparent;
+      border: 0;
+      cursor: pointer;
+    }
+
+    &:hover .att-download-icon,
+    .att-download-btn:hover .att-download-icon {
       opacity: 1;
     }
   }
@@ -654,6 +688,40 @@ async function previewTextFile(path: string, fileName: string): Promise<void> {
   white-space: pre-wrap;
   word-break: break-all;
   color: $text-primary;
-  background: $code-bg;
+}
+
+.text-preview-markdown {
+  padding: 16px;
+  overflow: auto;
+}
+
+.markdown-text-preview-drawer {
+  max-width: 100vw;
+
+  .n-drawer-content,
+  .n-drawer-body-content-wrapper {
+    max-width: 100vw;
+  }
+}
+
+@media (max-width: $breakpoint-mobile) {
+  .markdown-text-preview-drawer {
+    max-width: 100vw;
+
+    .n-drawer-content,
+    .n-drawer-body-content-wrapper {
+      max-width: 100vw;
+    }
+  }
+
+  .text-preview-body {
+    padding: 12px;
+    max-width: 100vw;
+  }
+
+  .text-preview-markdown {
+    padding: 12px;
+    max-width: 100vw;
+  }
 }
 </style>
diff --git a/packages/client/src/i18n/locales/de.ts b/packages/client/src/i18n/locales/de.ts
index 31e61a9..abfb770 100644
--- a/packages/client/src/i18n/locales/de.ts
+++ b/packages/client/src/i18n/locales/de.ts
@@ -1161,6 +1161,7 @@ jobTriggered: 'Job ausgelost',
     backendTimeout: 'Zeituberschreitung beim Lesen der Datei',
     unsupportedBackend: 'Aktuelles Terminal-Backend unterstutzt keine Datei-Downloads',
     invalidPath: 'Ungultiger Dateipfad',
+    contentDisplay: 'Inhalt anzeigen',
     download: 'Herunterladen',
     downloadFile: 'Datei herunterladen',
   },
diff --git a/packages/client/src/i18n/locales/en.ts b/packages/client/src/i18n/locales/en.ts
index 99dedc6..85df13a 100644
--- a/packages/client/src/i18n/locales/en.ts
+++ b/packages/client/src/i18n/locales/en.ts
@@ -1196,6 +1196,7 @@ export default {
     backendTimeout: 'File read timed out',
     unsupportedBackend: 'Current terminal backend does not support file download',
     invalidPath: 'Invalid file path',
+    contentDisplay: 'Content display',
     download: 'Download',
     downloadFile: 'Download file',
   },
diff --git a/packages/client/src/i18n/locales/es.ts b/packages/client/src/i18n/locales/es.ts
index 3720957..679f4ab 100644
--- a/packages/client/src/i18n/locales/es.ts
+++ b/packages/client/src/i18n/locales/es.ts
@@ -1161,6 +1161,7 @@ jobTriggered: 'Job ejecutado',
     backendTimeout: 'Tiempo de lectura del archivo agotado',
     unsupportedBackend: 'El backend del terminal actual no admite la descarga de archivos',
     invalidPath: 'Ruta de archivo invalida',
+    contentDisplay: 'Contenido',
     download: 'Descargar',
     downloadFile: 'Descargar archivo',
   },
diff --git a/packages/client/src/i18n/locales/fr.ts b/packages/client/src/i18n/locales/fr.ts
index aa5bcb4..dc300f7 100644
--- a/packages/client/src/i18n/locales/fr.ts
+++ b/packages/client/src/i18n/locales/fr.ts
@@ -1161,6 +1161,7 @@ jobTriggered: 'Job declenche',
     backendTimeout: 'Delai de lecture du fichier depasse',
     unsupportedBackend: 'Le backend de terminal actuel ne prend pas en charge le telechargement de fichiers',
     invalidPath: 'Chemin de fichier invalide',
+    contentDisplay: 'Affichage du contenu',
     download: 'Telecharger',
     downloadFile: 'Telecharger le fichier',
   },
diff --git a/packages/client/src/i18n/locales/ja.ts b/packages/client/src/i18n/locales/ja.ts
index 709fc0f..fd7da5c 100644
--- a/packages/client/src/i18n/locales/ja.ts
+++ b/packages/client/src/i18n/locales/ja.ts
@@ -1161,6 +1161,7 @@ export default {
     backendTimeout: 'ファイルの読み取りがタイムアウトしました',
     unsupportedBackend: '現在のターミナルバックエンドはファイルのダウンロードに対応していません',
     invalidPath: '無効なファイルパス',
+    contentDisplay: '内容表示',
     download: 'ダウンロード',
     downloadFile: 'ファイルをダウンロード',
   },
diff --git a/packages/client/src/i18n/locales/ko.ts b/packages/client/src/i18n/locales/ko.ts
index 59ccc47..c349ba8 100644
--- a/packages/client/src/i18n/locales/ko.ts
+++ b/packages/client/src/i18n/locales/ko.ts
@@ -1161,6 +1161,7 @@ export default {
     backendTimeout: '파일 읽기 시간 초과',
     unsupportedBackend: '현재 터미널 백엔드는 파일 다운로드를 지원하지 않습니다',
     invalidPath: '잘못된 파일 경로',
+    contentDisplay: '내용 표시',
     download: '다운로드',
     downloadFile: '파일 다운로드',
   },
diff --git a/packages/client/src/i18n/locales/pt.ts b/packages/client/src/i18n/locales/pt.ts
index 0009e4f..d133fec 100644
--- a/packages/client/src/i18n/locales/pt.ts
+++ b/packages/client/src/i18n/locales/pt.ts
@@ -1161,6 +1161,7 @@ jobTriggered: 'Job acionado',
     backendTimeout: 'Tempo esgotado para ler o arquivo',
     unsupportedBackend: 'O backend de terminal atual nao suporta download de arquivos',
     invalidPath: 'Caminho de arquivo invalido',
+    contentDisplay: 'Exibicao de conteudo',
     download: 'Baixar',
     downloadFile: 'Baixar arquivo',
   },
diff --git a/packages/client/src/i18n/locales/zh-TW.ts b/packages/client/src/i18n/locales/zh-TW.ts
index d943688..4da2417 100644
--- a/packages/client/src/i18n/locales/zh-TW.ts
+++ b/packages/client/src/i18n/locales/zh-TW.ts
@@ -1201,6 +1201,7 @@ export default {
     backendTimeout: '檔案讀取逾時',
     unsupportedBackend: '目前 terminal backend 暫不支援檔案下載',
     invalidPath: '無效的檔案路徑',
+    contentDisplay: '內容展示',
     download: '下載',
     downloadFile: '下載檔案',
   },
diff --git a/packages/client/src/i18n/locales/zh.ts b/packages/client/src/i18n/locales/zh.ts
index f9400e2..00e51d9 100644
--- a/packages/client/src/i18n/locales/zh.ts
+++ b/packages/client/src/i18n/locales/zh.ts
@@ -1198,6 +1198,7 @@ export default {
     backendTimeout: '文件读取超时',
     unsupportedBackend: '当前 terminal backend 暂不支持文件下载',
     invalidPath: '无效的文件路径',
+    contentDisplay: '内容展示',
     download: '下载',
     downloadFile: '下载文件',
   },
diff --git a/tests/client/markdown-rendering-mermaid-import-timeout.test.ts b/tests/client/markdown-rendering-mermaid-import-timeout.test.ts
index 026f531..23a4347 100644
--- a/tests/client/markdown-rendering-mermaid-import-timeout.test.ts
+++ b/tests/client/markdown-rendering-mermaid-import-timeout.test.ts
@@ -12,6 +12,16 @@ vi.mock('vue-i18n', () => ({
 }))
 
 vi.mock('naive-ui', () => ({
+  NDrawer: {
+    props: ['show'],
+    template: '<div v-if="show"><slot /></div>',
+  },
+  NDrawerContent: {
+    template: '<section><slot /></section>',
+  },
+  NSpin: {
+    template: '<div><slot /></div>',
+  },
   useMessage: () => ({
     error: vi.fn(),
     success: vi.fn(),
diff --git a/tests/client/markdown-rendering.test.ts b/tests/client/markdown-rendering.test.ts
index b00deb2..224a04e 100644
--- a/tests/client/markdown-rendering.test.ts
+++ b/tests/client/markdown-rendering.test.ts
@@ -10,6 +10,12 @@ const mermaidMock = vi.hoisted(() => ({
   })),
 }))
 
+const downloadApiMock = vi.hoisted(() => ({
+  downloadFile: vi.fn(() => Promise.resolve()),
+  fetchFileText: vi.fn(() => Promise.resolve('preview content')),
+  getDownloadUrl: vi.fn((path: string) => `http://test.local/api/hermes/download?path=${encodeURIComponent(path)}`),
+}))
+
 vi.mock('mermaid', () => ({
   default: mermaidMock,
 }))
@@ -28,6 +34,22 @@ vi.mock('vue-i18n', () => ({
 }))
 
 vi.mock('naive-ui', () => ({
+  NDrawer: {
+    props: ['show', 'width'],
+    template: '<div v-if="show" class="n-drawer-stub" :data-width="width"><slot /></div>',
+  },
+  NDrawerContent: {
+    props: {
+      title: { type: String, default: '' },
+      closable: { type: Boolean, default: false },
+      bodyContentStyle: { type: [Object, String], default: undefined },
+    },
+    template: '<section class="n-drawer-content-stub" :data-body-padding="bodyContentStyle && bodyContentStyle.padding"><header class="n-drawer-header-stub">{{ title }}<button v-if="closable" class="n-drawer-close-stub" @click="$emit(\'close\')">x</button></header><slot /></section>',
+  },
+  NSpin: {
+    props: ['show'],
+    template: '<div class="n-spin-stub"><slot /></div>',
+  },
   useMessage: () => ({
     error: vi.fn(),
     success: vi.fn(),
@@ -37,8 +59,9 @@ vi.mock('naive-ui', () => ({
 }))
 
 vi.mock('@/api/hermes/download', () => ({
-  downloadFile: vi.fn(),
-  getDownloadUrl: (path: string) => `http://test.local/api/hermes/download?path=${encodeURIComponent(path)}`,
+  downloadFile: downloadApiMock.downloadFile,
+  fetchFileText: downloadApiMock.fetchFileText,
+  getDownloadUrl: downloadApiMock.getDownloadUrl,
 }))
 
 import MarkdownRenderer from '@/components/hermes/chat/MarkdownRenderer.vue'
@@ -51,9 +74,15 @@ describe('MarkdownRenderer', () => {
   beforeEach(() => {
     mermaidMock.initialize.mockClear()
     mermaidMock.render.mockClear()
+    downloadApiMock.downloadFile.mockClear()
+    downloadApiMock.fetchFileText.mockClear()
+    downloadApiMock.getDownloadUrl.mockClear()
     mermaidMock.render.mockImplementation(async (id: string, source: string) => ({
       svg: `<svg id="${id}" data-testid="mermaid-svg"><text>${source}</text></svg>`,
     }))
+    downloadApiMock.downloadFile.mockResolvedValue(undefined)
+    downloadApiMock.fetchFileText.mockResolvedValue('preview content')
+    downloadApiMock.getDownloadUrl.mockImplementation((path: string) => `http://test.local/api/hermes/download?path=${encodeURIComponent(path)}`)
 
     Object.defineProperty(window, 'isSecureContext', {
       configurable: true,
@@ -253,6 +282,69 @@ describe('MarkdownRenderer', () => {
     expect(img.attributes('alt')).toBe('桌面截图')
   })
 
+  it('downloads local text files when the file card download icon is clicked', async () => {
+    const wrapper = mount(MarkdownRenderer, {
+      props: {
+        content: '[notes.txt](/tmp/notes.txt)',
+      },
+    })
+
+    expect(wrapper.find('.markdown-file-card').exists()).toBe(true)
+    expect(wrapper.find('.att-download-btn .att-download-icon').exists()).toBe(true)
+
+    await wrapper.find('.att-download-btn').trigger('click')
+    await Promise.resolve()
+
+    expect(downloadApiMock.downloadFile).toHaveBeenCalledTimes(1)
+    expect(downloadApiMock.downloadFile).toHaveBeenCalledWith('/tmp/notes.txt', 'notes.txt')
+    expect(downloadApiMock.fetchFileText).not.toHaveBeenCalled()
+    expect(wrapper.find('.n-drawer-stub').exists()).toBe(false)
+  })
+
+  it('opens text previews in a responsive drawer with a close control', async () => {
+    const wrapper = mount(MarkdownRenderer, {
+      props: {
+        content: '[notes.txt](/tmp/notes.txt)',
+      },
+    })
+
+    await wrapper.find('.markdown-file-card').trigger('click')
+    await Promise.resolve()
+    await nextTick()
+
+    const drawer = wrapper.find('.n-drawer-stub')
+    expect(drawer.exists()).toBe(true)
+    expect(drawer.attributes('data-width')).toBe('min(800px, 100vw)')
+    expect(drawer.find('.n-drawer-content-stub').attributes('data-body-padding')).toBe('0')
+    expect(drawer.text()).toContain('download.contentDisplay')
+    expect(downloadApiMock.fetchFileText).toHaveBeenCalledWith('/tmp/notes.txt', 'notes.txt')
+
+    await drawer.find('.n-drawer-close-stub').trigger('click')
+    await nextTick()
+
+    expect(wrapper.find('.n-drawer-stub').exists()).toBe(false)
+  })
+
+  it('renders markdown file previews as markdown content', async () => {
+    downloadApiMock.fetchFileText.mockResolvedValue('# Preview Title\n\n**bold text**')
+    const wrapper = mount(MarkdownRenderer, {
+      props: {
+        content: '[notes.md](/tmp/notes.md)',
+      },
+    })
+
+    await wrapper.find('.markdown-file-card').trigger('click')
+    await Promise.resolve()
+    await nextTick()
+
+    const drawer = wrapper.find('.n-drawer-stub')
+    expect(drawer.exists()).toBe(true)
+    expect(drawer.find('.text-preview-markdown').exists()).toBe(true)
+    expect(drawer.find('.text-preview-body').exists()).toBe(false)
+    expect(drawer.find('.text-preview-markdown h1').text()).toBe('Preview Title')
+    expect(drawer.find('.text-preview-markdown strong').text()).toBe('bold text')
+  })
+
   it('keeps tilde-fenced markdown examples with nested tilde fences intact', () => {
     const wrapper = mount(MarkdownRenderer, {
       props: {