diff --git a/packages/backend/src/repositories/appearance.repository.ts b/packages/backend/src/repositories/appearance.repository.ts
index b64f243..0a17803 100644
--- a/packages/backend/src/repositories/appearance.repository.ts
+++ b/packages/backend/src/repositories/appearance.repository.ts
@@ -61,6 +61,9 @@ const mapRowsToAppearanceSettings = (rows: DbAppearanceSettingsRow[]): Appearanc
             case 'editorFontFamily':
                 settings.editorFontFamily = row.value || null; // 如果为空字符串，则视为 null
                 break;
+           case 'terminal_custom_html':
+               settings.terminal_custom_html = row.value;
+               break;
         }
     }
  
@@ -75,15 +78,16 @@ const mapRowsToAppearanceSettings = (rows: DbAppearanceSettingsRow[]): Appearanc
         editorFontFamily: settings.editorFontFamily ?? defaults.editorFontFamily,
         terminalBackgroundImage: settings.terminalBackgroundImage ?? defaults.terminalBackgroundImage,
         pageBackgroundImage: settings.pageBackgroundImage ?? defaults.pageBackgroundImage,
-        // 修改：只有当数据库中未找到记录时才使用默认值
+        // 只有当数据库中未找到记录时才使用默认值
         terminalBackgroundEnabled: terminalBackgroundEnabledFound
             ? settings.terminalBackgroundEnabled // 使用数据库找到的值 (true 或 false)
             : defaults.terminalBackgroundEnabled, // 否则使用默认值 (true)
         terminalBackgroundOverlayOpacity: terminalBackgroundOverlayOpacityFound
             ? settings.terminalBackgroundOverlayOpacity // 使用数据库找到的值
             : defaults.terminalBackgroundOverlayOpacity, // 否则使用默认值
-        updatedAt: latestUpdatedAt || defaults.updatedAt, // 使用最新的更新时间，否则使用默认时间戳
-    };
+       terminal_custom_html: settings.terminal_custom_html ?? defaults.terminal_custom_html,
+       updatedAt: latestUpdatedAt || defaults.updatedAt, // 使用最新的更新时间，否则使用默认时间戳
+   };
 };
  
  
@@ -100,8 +104,9 @@ const getDefaultAppearanceSettings = (): Omit<AppearanceSettings, '_id'> => {
         pageBackgroundImage: undefined,
         terminalBackgroundEnabled: true, // 默认启用
         terminalBackgroundOverlayOpacity: 0.5, // 默认蒙版透明度
-        updatedAt: Date.now(), // 提供默认时间戳
-    };
+       terminal_custom_html: '', // 默认自定义 HTML 为空字符串
+       updatedAt: Date.now(), // 提供默认时间戳
+   };
 };
  
  
@@ -126,7 +131,8 @@ export const ensureDefaultSettingsExist = async (db: sqlite3.Database): Promise<
         { key: 'terminalBackgroundImage', value: defaults.terminalBackgroundImage ?? '' }, // 数据库中使用空字符串
         { key: 'pageBackgroundImage', value: defaults.pageBackgroundImage ?? '' }, // 数据库中使用空字符串
         { key: 'terminalBackgroundEnabled', value: defaults.terminalBackgroundEnabled },
-        { key: 'terminalBackgroundOverlayOpacity', value: defaults.terminalBackgroundOverlayOpacity }, 
+        { key: 'terminalBackgroundOverlayOpacity', value: defaults.terminalBackgroundOverlayOpacity },
+        { key: 'terminal_custom_html', value: defaults.terminal_custom_html },
     ];
  
     try {
diff --git a/packages/backend/src/services/appearance.service.ts b/packages/backend/src/services/appearance.service.ts
index a56279c..4efaee0 100644
--- a/packages/backend/src/services/appearance.service.ts
+++ b/packages/backend/src/services/appearance.service.ts
@@ -100,7 +100,19 @@ export const updateSettings = async (settingsDto: UpdateAppearanceDto): Promise<
     settingsDto.terminalBackgroundOverlayOpacity = opacity; // 确保类型正确
   }
 
-  // TODO: 如果实现了背景图片上传，这里需要处理文件路径或 URL 的验证/保存逻辑
+
+
+  // 验证 terminal_custom_html (如果提供了)
+  if (settingsDto.hasOwnProperty('terminal_custom_html')) {
+    if (settingsDto.terminal_custom_html === null || settingsDto.terminal_custom_html === undefined || typeof settingsDto.terminal_custom_html === 'string') {
+      // 允许为空字符串、null 或 undefined (将被视为空)
+      if (typeof settingsDto.terminal_custom_html === 'string' && settingsDto.terminal_custom_html.length > 10240) { // 10KB 限制
+        throw new Error('自定义终端 HTML 过长，最多允许 10240 个字符。');
+      }
+    } else {
+      throw new Error('无效的自定义终端 HTML 类型，应为字符串。');
+    }
+  }
 
   return appearanceRepository.updateAppearanceSettings(settingsDto);
 };
diff --git a/packages/backend/src/types/appearance.types.ts b/packages/backend/src/types/appearance.types.ts
index 7c42984..33fa71f 100644
--- a/packages/backend/src/types/appearance.types.ts
+++ b/packages/backend/src/types/appearance.types.ts
@@ -19,6 +19,7 @@ export interface AppearanceSettings {
   editorFontFamily?: string | null; // Monaco Editor 字体偏好
   terminalBackgroundEnabled?: boolean; // 终端背景是否启用
   terminalBackgroundOverlayOpacity?: number; // 终端背景蒙版透明度 (0-1)
+  terminal_custom_html?: string; // 用户自定义终端背景 HTML
   updatedAt?: number;
 }
  
diff --git a/packages/frontend/src/components/StyleCustomizer.vue b/packages/frontend/src/components/StyleCustomizer.vue
index 204120c..e22cc14 100644
--- a/packages/frontend/src/components/StyleCustomizer.vue
+++ b/packages/frontend/src/components/StyleCustomizer.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref } from 'vue';
+import { ref, onMounted, onUnmounted, nextTick, reactive } from 'vue';
 import { useI18n } from 'vue-i18n';
 import type { TerminalTheme } from '../types/terminal-theme.types';
 import StyleCustomizerUiTab from './style-customizer/StyleCustomizerUiTab.vue';
@@ -42,15 +42,102 @@ const handleResetUiTheme = async () => {
 
 
 const modalRootRef = ref<HTMLDivElement | null>(null);
+const headerRef = ref<HTMLElement | null>(null);
+const dialogContentRef = ref<HTMLDivElement | null>(null);
+
+const draggableState = reactive({
+  isDragging: false,
+  startX: 0,
+  startY: 0,
+  initialLeft: 0,
+  initialTop: 0,
+});
+
+onMounted(() => {
+  const headerElement = headerRef.value;
+  const dialogEl = dialogContentRef.value;
+  const rootEl = modalRootRef.value;
+
+  if (!headerElement || !dialogEl || !rootEl) {
+    // console.warn("Draggable elements not found for StyleCustomizer modal."); // 用于调试的可选日志
+    return;
+  }
+  
+  nextTick(() => {
+    //确保对话框已渲染且其尺寸可用
+    if (dialogEl && rootEl) {
+        dialogEl.style.position = 'absolute'; // 使对话框在rootEl内绝对定位
+        const rootWidth = rootEl.clientWidth;
+        const rootHeight = rootEl.clientHeight;
+        const dialogWidth = dialogEl.offsetWidth;
+        const dialogHeight = dialogEl.offsetHeight;
+
+        // 使对话框居中
+        dialogEl.style.left = `${Math.max(0, (rootWidth - dialogWidth) / 2)}px`;
+        dialogEl.style.top = `${Math.max(0, (rootHeight - dialogHeight) / 2)}px`;
+    }
+  });
+
+  const onMouseDown = (event: MouseEvent) => {
+    if (!dialogEl) return;
+    event.preventDefault(); // 防止文本选择等默认行为
+
+    draggableState.isDragging = true;
+    draggableState.startX = event.clientX;
+    draggableState.startY = event.clientY;
+    draggableState.initialLeft = dialogEl.offsetLeft;
+    draggableState.initialTop = dialogEl.offsetTop;
+    
+    document.addEventListener('mousemove', onMouseMove);
+    document.addEventListener('mouseup', onMouseUp);
+  };
+
+  const onMouseMove = (event: MouseEvent) => {
+    if (!draggableState.isDragging || !dialogEl || !rootEl) return;
+
+    const dx = event.clientX - draggableState.startX;
+    const dy = event.clientY - draggableState.startY;
+
+    let newLeft = draggableState.initialLeft + dx;
+    let newTop = draggableState.initialTop + dy;
+
+    // 边界检查，使对话框保持在 modalRootRef (视口) 内
+    newLeft = Math.max(0, Math.min(newLeft, rootEl.clientWidth - dialogEl.offsetWidth));
+    newTop = Math.max(0, Math.min(newTop, rootEl.clientHeight - dialogEl.offsetHeight));
+    
+    dialogEl.style.left = `${newLeft}px`;
+    dialogEl.style.top = `${newTop}px`;
+  };
+
+  const onMouseUp = () => {
+    if (!draggableState.isDragging) return;
+    draggableState.isDragging = false;
+    document.removeEventListener('mousemove', onMouseMove);
+    document.removeEventListener('mouseup', onMouseUp);
+  };
+
+  headerElement.addEventListener('mousedown', onMouseDown);
+  headerElement.style.cursor = 'move'; // 设置页眉鼠标样式为可拖动
+
+  onUnmounted(() => {
+    if (headerElement) {
+      headerElement.removeEventListener('mousedown', onMouseDown);
+      headerElement.style.cursor = ''; // 重置鼠标样式
+    }
+    // 清理全局监听器
+    document.removeEventListener('mousemove', onMouseMove);
+    document.removeEventListener('mouseup', onMouseUp);
+  });
+});
 
 
 </script>
 
 
 <template>
-  <div ref="modalRootRef" class="fixed inset-0 bg-black/60 flex justify-center items-center z-[1000] p-2 md:p-4" @click.self="closeCustomizer">
-    <div class="bg-background text-foreground rounded-lg shadow-lg w-full h-full md:w-[90%] md:max-w-[800px] md:h-[85vh] md:max-h-[700px] flex flex-col overflow-hidden">
-      <header class="flex justify-between items-center px-4 py-3 border-b border-border bg-header flex-shrink-0">
+  <div ref="modalRootRef" class="fixed inset-0 z-[1000]" @click.self="closeCustomizer">
+    <div ref="dialogContentRef" class="bg-background text-foreground rounded-lg shadow-lg w-full h-full md:w-[90%] md:max-w-[800px] md:h-[85vh] md:max-h-[700px] flex flex-col overflow-hidden">
+      <header ref="headerRef" class="flex justify-between items-center px-4 py-3 border-b border-border bg-header flex-shrink-0">
         <h2 class="m-0 text-lg md:text-xl text-foreground">{{ t('styleCustomizer.title') }}</h2>
         <button @click="closeCustomizer" class="bg-transparent border-none text-2xl md:text-3xl leading-none cursor-pointer text-text-secondary px-2 py-1 rounded hover:text-foreground hover:bg-black/10">&times;</button>
       </header>
diff --git a/packages/frontend/src/components/Terminal.vue b/packages/frontend/src/components/Terminal.vue
index 91626d1..02167a4 100644
--- a/packages/frontend/src/components/Terminal.vue
+++ b/packages/frontend/src/components/Terminal.vue
@@ -29,6 +29,7 @@ const terminalOuterWrapperRef = ref<HTMLElement | null>(null); // 最外层容
 let terminal: Terminal | null = null;
 let fitAddon: FitAddon | null = null;
 let searchAddon: SearchAddon | null = null; // *** 添加 searchAddon 变量 ***
+const customHtmlLayerRef = ref<HTMLElement | null>(null); // Ref for the custom HTML layer
 let resizeObserver: ResizeObserver | null = null;
 let observedElement: HTMLElement | null = null; // +++ Store the observed element +++
 let debounceTimer: number | null = null; // 用于防抖的计时器 ID
@@ -49,6 +50,7 @@ const {
   currentTerminalFontSize,
   isTerminalBackgroundEnabled,
   currentTerminalBackgroundOverlayOpacity, // 获取蒙版透明度
+  terminalCustomHTML, // 用于自定义终端背景 HTML
 } = storeToRefs(appearanceStore);
  
 // --- Settings Store ---
@@ -614,7 +616,28 @@ defineExpose({ write, findNext, findPrevious, clearSearch, clear }); // 暴露 c
 const applyTerminalBackground = () => {
     // 背景应用到 terminalOuterWrapperRef
     if (terminalOuterWrapperRef.value) {
-        if (!isTerminalBackgroundEnabled.value) {
+        if (isTerminalBackgroundEnabled.value) {
+            // 只要启用了背景功能，就应该让 xterm 透明以显示下方内容
+            nextTick(() => {
+                if (terminalOuterWrapperRef.value) {
+                    terminalOuterWrapperRef.value.classList.add('has-terminal-background');
+                    if (terminalBackgroundImage.value) {
+                        const backendUrl = import.meta.env.VITE_API_BASE_URL || '';
+                        const imagePath = terminalBackgroundImage.value;
+                        const fullImageUrl = `${backendUrl}${imagePath}`;
+                        terminalOuterWrapperRef.value.style.backgroundImage = `url(${fullImageUrl})`;
+                        terminalOuterWrapperRef.value.style.backgroundSize = 'cover';
+                        terminalOuterWrapperRef.value.style.backgroundPosition = 'center';
+                        terminalOuterWrapperRef.value.style.backgroundRepeat = 'no-repeat';
+                        console.log(`[Terminal ${props.sessionId}] 应用终端背景图片: ${terminalBackgroundImage.value}`);
+                    } else {
+                        terminalOuterWrapperRef.value.style.backgroundImage = 'none';
+                        console.log(`[Terminal ${props.sessionId}] 终端背景功能已启用，但无背景图片，xterm 应透明。`);
+                    }
+                }
+            });
+        } else {
+            // 背景功能禁用
             nextTick(() => {
                  if (terminalOuterWrapperRef.value) {
                     terminalOuterWrapperRef.value.style.backgroundImage = 'none';
@@ -622,45 +645,82 @@ const applyTerminalBackground = () => {
                  }
             });
             console.log(`[Terminal ${props.sessionId}] 终端背景已禁用，移除背景。`);
-            return;
-        }
- 
-        if (terminalBackgroundImage.value) {
-            const backendUrl = import.meta.env.VITE_API_BASE_URL || '';
-            const imagePath = terminalBackgroundImage.value;
-            const fullImageUrl = `${backendUrl}${imagePath}`;
-            nextTick(() => {
-                if (terminalOuterWrapperRef.value) {
-                    terminalOuterWrapperRef.value.style.backgroundImage = `url(${fullImageUrl})`;
-                    terminalOuterWrapperRef.value.style.backgroundSize = 'cover';
-                    terminalOuterWrapperRef.value.style.backgroundPosition = 'center';
-                    terminalOuterWrapperRef.value.style.backgroundRepeat = 'no-repeat';
-                    terminalOuterWrapperRef.value.classList.add('has-terminal-background');
-                }
-            });
-            console.log(`[Terminal ${props.sessionId}] 应用终端背景图片: ${terminalBackgroundImage.value}`);
-        } else {
-            nextTick(() => {
-                 if (terminalOuterWrapperRef.value) {
-                    terminalOuterWrapperRef.value.style.backgroundImage = 'none';
-                    terminalOuterWrapperRef.value.classList.remove('has-terminal-background');
-                 }
-            });
-             console.log(`[Terminal ${props.sessionId}] 移除终端背景图片。`);
         }
     }
 };
 
+// Function to execute scripts within an element
+const executeScriptsInElement = (container: HTMLElement) => {
+  if (!container) return;
+  console.log('[Terminal] Attempting to execute scripts in custom HTML container:', container);
+
+  const scripts = Array.from(container.getElementsByTagName('script'));
+  console.log(`[Terminal] Found ${scripts.length} script(s) in custom HTML.`);
+
+  scripts.forEach((oldScript, index) => {
+    console.log(`[Terminal] Processing script #${index + 1}:`, oldScript.outerHTML.substring(0, 100) + '...');
+    const newScript = document.createElement('script');
+
+    // Copy attributes (type, src, async, defer, etc.)
+    Array.from(oldScript.attributes).forEach(attr => {
+      newScript.setAttribute(attr.name, attr.value);
+      console.log(`[Terminal] Script #${index + 1}: Copied attribute ${attr.name}="${attr.value}"`);
+    });
+
+    // Copy content for inline scripts
+    if (oldScript.textContent) {
+      newScript.textContent = oldScript.textContent;
+      console.log(`[Terminal] Script #${index + 1}: Copied inline content.`);
+    }
+
+    if (oldScript.parentNode) {
+      oldScript.parentNode.insertBefore(newScript, oldScript.nextSibling); // Insert new after old
+      oldScript.parentNode.removeChild(oldScript); // Then remove old
+      console.log('[Terminal] Script #${index + 1} re-inserted and old one removed.');
+    } else {
+      container.appendChild(newScript);
+      console.warn('[Terminal] Script #${index + 1} had no parent, appended to container directly.');
+    }
+  });
+  console.log('[Terminal] Finished processing scripts in custom HTML.');
+};
+
+// Watch for changes in terminalCustomHTML and execute scripts
+watch(terminalCustomHTML, (newHtmlContent) => {
+  // Always operate within nextTick to ensure v-html has updated the DOM
+  nextTick(() => {
+    const container = customHtmlLayerRef.value;
+    if (container) {
+      if (newHtmlContent) {
+        console.log('[Terminal] terminalCustomHTML changed, processing new HTML content.');
+        executeScriptsInElement(container);
+      } else {
+        console.log('[Terminal] terminalCustomHTML cleared.');
+      }
+    }
+  });
+}, { immediate: true }); 
+                         
+                         
+                       
+
 </script>
 
 <template>
   <div ref="terminalOuterWrapperRef" class="terminal-outer-wrapper">
     <!-- 蒙版层 -->
     <div
-      v-if="isTerminalBackgroundEnabled && terminalBackgroundImage"
+      v-if="isTerminalBackgroundEnabled"
       class="terminal-background-overlay"
       :style="{ backgroundColor: `rgba(0, 0, 0, ${currentTerminalBackgroundOverlayOpacity})` }"
     ></div>
+    <div
+      ref="customHtmlLayerRef"
+      v-if="isTerminalBackgroundEnabled && terminalCustomHTML"
+      class="terminal-custom-html-layer"
+      style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1; pointer-events: none;"
+      v-html="terminalCustomHTML"
+    ></div>
     <!-- xterm 实际挂载点 -->
     <div ref="terminalRef" class="terminal-inner-container"></div>
   </div>
diff --git a/packages/frontend/src/components/style-customizer/StyleCustomizerBackgroundTab.vue b/packages/frontend/src/components/style-customizer/StyleCustomizerBackgroundTab.vue
index b00e337..73fe6a9 100644
--- a/packages/frontend/src/components/style-customizer/StyleCustomizerBackgroundTab.vue
+++ b/packages/frontend/src/components/style-customizer/StyleCustomizerBackgroundTab.vue
@@ -12,10 +12,12 @@ const {
   terminalBackgroundImage,
   isTerminalBackgroundEnabled,
   currentTerminalBackgroundOverlayOpacity,
+  terminalCustomHTML, 
 } = storeToRefs(appearanceStore);
 
 const localTerminalBackgroundEnabled = ref(true);
 const editableTerminalBackgroundOverlayOpacity = ref(0.5);
+const localTerminalCustomHTML = ref(''); 
 
 const terminalBgFileInput = ref<HTMLInputElement | null>(null);
 const uploadError = ref<string | null>(null);
@@ -23,6 +25,7 @@ const uploadError = ref<string | null>(null);
 const initializeEditableState = () => {
   localTerminalBackgroundEnabled.value = isTerminalBackgroundEnabled.value;
   editableTerminalBackgroundOverlayOpacity.value = currentTerminalBackgroundOverlayOpacity.value;
+  localTerminalCustomHTML.value = terminalCustomHTML.value || ''; 
   uploadError.value = null;
 };
 
@@ -40,6 +43,13 @@ watch(currentTerminalBackgroundOverlayOpacity, (newValue) => {
   }
 });
 
+
+watch(terminalCustomHTML, (newValue) => {
+  if (localTerminalCustomHTML.value !== (newValue || '')) {
+    localTerminalCustomHTML.value = newValue || '';
+  }
+});
+
 const handleTriggerTerminalBgUpload = () => {
     uploadError.value = null;
     terminalBgFileInput.value?.click();
@@ -104,6 +114,17 @@ const handleSaveTerminalBackgroundOverlayOpacity = async () => {
   }
 };
 
+
+const handleSaveCustomHTML = async () => {
+  try {
+    await appearanceStore.setTerminalCustomHTML(localTerminalCustomHTML.value);
+    notificationsStore.addNotification({ type: 'success', message: t('styleCustomizer.customTerminalHTMLSaved') });
+  } catch (error: any) {
+    console.error("保存自定义终端 HTML 失败:", error);
+    notificationsStore.addNotification({ type: 'error', message: t('styleCustomizer.customTerminalHTMLSaveFailed', { message: error.message }) });
+  }
+};
+
 </script>
 
 <template>
@@ -171,6 +192,26 @@ const handleSaveTerminalBackgroundOverlayOpacity = async () => {
             <button @click="handleSaveTerminalBackgroundOverlayOpacity" class="px-3 py-1.5 text-sm border border-border rounded bg-header hover:bg-border transition duration-200 ease-in-out whitespace-nowrap">{{ t('common.save') }}</button>
         </div>
      </div>
+
+     <!-- 自定义终端背景 HTML -->
+     <div class="mt-4 pt-4 border-t border-border/50">
+        <label for="terminalCustomHTML" class="block text-sm font-medium text-foreground mb-1">{{ t('styleCustomizer.customTerminalHTML', '自定义终端背景 HTML') }}</label>
+        <textarea
+          id="terminalCustomHTML"
+          v-model="localTerminalCustomHTML"
+          rows="10"
+          class="w-full p-2 border border-border rounded bg-input text-foreground focus:ring-primary focus:border-primary"
+          :placeholder="t('styleCustomizer.customTerminalHTMLPlaceholder', '例如：<h1>Hello</h1>')"
+        ></textarea>
+        <div class="mt-2 flex justify-end">
+          <button
+            @click="handleSaveCustomHTML"
+            class="px-3 py-1.5 text-sm border border-border rounded bg-header hover:bg-border transition duration-200 ease-in-out whitespace-nowrap"
+          >
+            {{ t('common.save') }}
+          </button>
+        </div>
+      </div>
     </div>
     <div v-else class="p-4 text-center text-text-secondary italic border border-dashed border-border/50 rounded-md">
       {{ t('styleCustomizer.terminalBgDisabled', '终端背景功能已禁用。') }}
diff --git a/packages/frontend/src/components/style-customizer/StyleCustomizerTerminalTab.vue b/packages/frontend/src/components/style-customizer/StyleCustomizerTerminalTab.vue
index b696935..374ffdd 100644
--- a/packages/frontend/src/components/style-customizer/StyleCustomizerTerminalTab.vue
+++ b/packages/frontend/src/components/style-customizer/StyleCustomizerTerminalTab.vue
@@ -57,10 +57,6 @@ brightMagenta: #ff55ff
 brightCyan: #55ffff
 brightWhite: #ffffff`;
 // Theme preview refs
-const originalModalRootBackgroundColor = ref<string | null>(null);
-const originalModalContentOpacity = ref<string | null>(null);
-const originalModalRootTransition = ref<string | null>(null);
-const originalModalContentTransition = ref<string | null>(null);
 
 const initializeEditableState = () => {
   editableTerminalFontFamily.value = currentTerminalFontFamily.value;
@@ -341,73 +337,6 @@ const handleFocusAndSelect = (event: FocusEvent) => {
   }
 };
 
-const handlePreviewButtonMouseDown = async (event: MouseEvent, themeToPreview: TerminalTheme) => {
-  event.preventDefault();
-  if (props.modalRootRef && themeToPreview._id) {
-    const modalContentElement = props.modalRootRef.firstElementChild as HTMLElement;
-    try {
-      const themeData = await appearanceStore.loadTerminalThemeData(themeToPreview._id);
-      if (!themeData) {
-        console.error('Preview failed: Could not load theme data for', themeToPreview.name);
-        return;
-      }
-      appearanceStore.startTerminalThemePreview(themeData);
-
-      if (originalModalRootBackgroundColor.value === null && modalContentElement) {
-        originalModalRootBackgroundColor.value = window.getComputedStyle(props.modalRootRef).backgroundColor;
-        originalModalRootTransition.value = props.modalRootRef.style.transition;
-        originalModalContentOpacity.value = window.getComputedStyle(modalContentElement).opacity;
-        originalModalContentTransition.value = modalContentElement.style.transition;
-      }
-
-      props.modalRootRef.style.transition = 'background-color 0.05s ease-out, opacity 0.05s ease-out';
-      props.modalRootRef.style.backgroundColor = 'transparent';
-      if (modalContentElement) {
-        modalContentElement.style.transition = 'opacity 0.05s ease-out';
-        modalContentElement.style.opacity = '0';
-      }
-
-      const restoreOnMouseUp = () => {
-        appearanceStore.stopTerminalThemePreview();
-        if (props.modalRootRef) {
-          props.modalRootRef.style.backgroundColor = originalModalRootBackgroundColor.value || '';
-          props.modalRootRef.style.transition = originalModalRootTransition.value || '';
-        }
-        if (modalContentElement) {
-          modalContentElement.style.opacity = originalModalContentOpacity.value || '1';
-          modalContentElement.style.transition = originalModalContentTransition.value || '';
-        }
-        originalModalRootBackgroundColor.value = null;
-        originalModalContentOpacity.value = null;
-        originalModalRootTransition.value = null;
-        originalModalContentTransition.value = null;
-        document.removeEventListener('mouseup', restoreOnMouseUp);
-        const currentTargetButton = event.currentTarget as HTMLElement | null;
-        if (currentTargetButton) {
-            currentTargetButton.removeEventListener('mouseleave', restoreOnMouseUp);
-        }
-      };
-      document.addEventListener('mouseup', restoreOnMouseUp, { once: true });
-      const currentTargetButton = event.currentTarget as HTMLElement | null;
-      if (currentTargetButton) {
-          currentTargetButton.addEventListener('mouseleave', restoreOnMouseUp, { once: true });
-      }
-    } catch (error) {
-      console.error('Error during theme preview:', error);
-      appearanceStore.stopTerminalThemePreview();
-      if (props.modalRootRef && modalContentElement) {
-          props.modalRootRef.style.backgroundColor = originalModalRootBackgroundColor.value || '';
-          props.modalRootRef.style.transition = originalModalRootTransition.value || '';
-          modalContentElement.style.opacity = originalModalContentOpacity.value || '1';
-          modalContentElement.style.transition = originalModalContentTransition.value || '';
-          originalModalRootBackgroundColor.value = null;
-          originalModalContentOpacity.value = null;
-          originalModalRootTransition.value = null;
-          originalModalContentTransition.value = null;
-      }
-    }
-  }
-};
 
 // Computed Properties
 const activeThemeName = computed(() => {
@@ -543,15 +472,6 @@ watch(() => props.isEditingTheme, (isEditing) => {
                   >
                       {{ t('styleCustomizer.applyButton', 'Apply') }}
                  </button>
-                 <button
-                     @mousedown="(event) => handlePreviewButtonMouseDown(event, theme)"
-                     :class="[
-                       'px-3 py-1.5 text-xs md:text-sm border rounded transition-colors duration-200 ease-in-out whitespace-nowrap',
-                       theme._id === activeTerminalThemeId?.toString() ? 'text-button-text border-white/30 bg-white/10 hover:bg-white/20 hover:border-white/50' : 'border-border bg-header text-foreground hover:bg-border hover:border-text-secondary'
-                     ]"
-                 >
-                      {{ t('styleCustomizer.previewButton', 'Preview') }}
-                 </button>
                 <button @click="handleEditTheme(theme)" :title="theme.isPreset ? t('styleCustomizer.editAsCopy', 'Edit as Copy') : t('common.edit')"
                    :class="[
                      'px-3 py-1.5 text-xs md:text-sm border rounded transition-colors duration-200 ease-in-out whitespace-nowrap disabled:opacity-60 disabled:cursor-not-allowed',
diff --git a/packages/frontend/src/stores/appearance.store.ts b/packages/frontend/src/stores/appearance.store.ts
index c38d683..9ffbe3f 100644
--- a/packages/frontend/src/stores/appearance.store.ts
+++ b/packages/frontend/src/stores/appearance.store.ts
@@ -134,6 +134,9 @@ export const useAppearanceStore = defineStore('appearance', () => {
         return typeof opacity === 'number' && opacity >= 0 && opacity <= 1 ? opacity : 0.5; // 默认 0.5
     });
 
+    // 获取终端自定义 CSS
+    const terminalCustomHTML = computed(() => appearanceSettings.value.terminal_custom_html ?? null);
+
     // --- Actions ---
 
     /**
@@ -307,6 +310,22 @@ export const useAppearanceStore = defineStore('appearance', () => {
         await updateAppearanceSettings({ terminalBackgroundOverlayOpacity: opacity });
     }
 
+    /**
+     * 设置终端自定义 HTML
+     * @param html HTML 字符串，或 null 清除
+     */
+    async function setTerminalCustomHTML(html: string | null) {
+        try {
+            await updateAppearanceSettings({ terminal_custom_html: html });
+            // console.log('[AppearanceStore] Terminal custom HTML updated successfully.');
+            // 可以在此调用 uiNotifications.store 来显示成功消息
+        } catch (err: any) {
+            console.error('设置终端自定义 HTML 失败:', err);
+            // 可以在此调用 uiNotifications.store 来显示失败消息
+            throw new Error(err.response?.data?.message || err.message || '设置终端自定义 HTML 失败');
+        }
+    }
+
     // --- 终端主题列表管理 Actions ---
 
     /**
@@ -675,11 +694,13 @@ export const useAppearanceStore = defineStore('appearance', () => {
         exportTerminalTheme,
         uploadPageBackground,
         uploadTerminalBackground,
-        setTerminalBackgroundOverlayOpacity, 
+        setTerminalBackgroundOverlayOpacity,
+        setTerminalCustomHTML, // 设置终端自定义 HTML
         removePageBackground,
         removeTerminalBackground,
         loadTerminalThemeData, 
         isTerminalBackgroundEnabled,
+        terminalCustomHTML, // 获取终端自定义 HTML
         startTerminalThemePreview,
         stopTerminalThemePreview, 
         // Visibility control
diff --git a/packages/frontend/src/types/appearance.types.ts b/packages/frontend/src/types/appearance.types.ts
index 1b41308..cca722d 100644
--- a/packages/frontend/src/types/appearance.types.ts
+++ b/packages/frontend/src/types/appearance.types.ts
@@ -15,6 +15,7 @@ export interface AppearanceSettings {
   editorFontFamily?: string | null; // Monaco Editor 字体偏好
   terminalBackgroundEnabled?: boolean; // 终端背景是否启用
   terminalBackgroundOverlayOpacity?: number; // 终端背景蒙版透明度 (0-1)
+  terminal_custom_html?: string | null; // 终端自定义 HTML
 }
  
 // 前端用于更新外观设置的数据结构 (对应 API 请求体)