diff --git a/src/components/ai/AiPanel.vue b/src/components/ai/AiPanel.vue
index e63ec48..69b5a3c 100644
--- a/src/components/ai/AiPanel.vue
+++ b/src/components/ai/AiPanel.vue
@@ -9,6 +9,7 @@ import { store } from '../../core/store'
 import { generate, polish, chat, beautifyPage, isConfigured } from '../../core/ai'
 import { elementTypes } from '../../core/sample'
 import { renderMd } from '../../core/markdown'
+import { appPrompt, appConfirm } from '../../core/dialog'
 import OutlinePanel from './OutlinePanel.vue'
 
 const emit = defineEmits<{
@@ -292,7 +293,7 @@ function onStop() {
 /* ---------- 生成整套 ---------- */
 async function onGenerate() {
   if (busy.value) return
-  const topic = inputText.value.trim() || prompt('请输入演示主题，例如「远程办公的兴起与未来」')
+  const topic = inputText.value.trim() || await appPrompt('生成整套', { message: '请输入演示主题', placeholder: '例如「远程办公的兴起与未来」' })
   if (!topic) return
   if (!isConfigured()) { toast('请先配置 API Key'); emit('open-settings'); return }
   inputText.value = ''
@@ -345,9 +346,9 @@ async function onPolish() {
 }
 
 /* ---------- 清空 ---------- */
-function onClear() {
+async function onClear() {
   if (!chatLog.value.length) { toast('对话已是空的'); return }
-  if (!confirm('清空当前 PPT 的对话记录？')) return
+  if (!(await appConfirm('清空对话记录？', '将清空当前 PPT 的对话记录', { danger: true, okText: '清空' }))) return
   chatLog.value = []
   store.clearChat(currentChatId.value)
   renderMsgs.value = []
diff --git a/src/components/common/AppDialog.vue b/src/components/common/AppDialog.vue
new file mode 100644
index 0000000..27f8581
--- /dev/null
+++ b/src/components/common/AppDialog.vue
@@ -0,0 +1,66 @@
+<!-- =====================================================================
+  AppDialog.vue — 全局统一对话框宿主（替代原生 alert/confirm/prompt）
+  由 core/dialog.ts 的模块级状态驱动；在 App.vue 模板放置 <AppDialog /> 接线
+  ===================================================================== -->
+<script setup lang="ts">
+import { ref, watch, nextTick } from 'vue'
+import { dialogState, resolveDialog } from '../../core/dialog'
+
+const inputValue = ref('')
+const inputRef = ref<HTMLInputElement | null>(null)
+
+watch(() => dialogState.open.value, async (v) => {
+  if (!v) return
+  inputValue.value = dialogState.options.value?.defaultValue || ''
+  await nextTick()
+  if (dialogState.options.value?.type === 'prompt') {
+    inputRef.value?.focus()
+    inputRef.value?.select()
+  }
+})
+
+function onMaskKeydown(e: KeyboardEvent) {
+  // confirm/alert 无输入框，键盘焦点在 mask 上时也支持 Enter/Esc
+  if (e.key === 'Enter') {
+    e.preventDefault(); e.stopPropagation()
+    resolveDialog({ ok: true, value: inputValue.value })
+  } else if (e.key === 'Escape') {
+    e.preventDefault(); e.stopPropagation()
+    resolveDialog({ ok: false, value: '' })
+  }
+}
+</script>
+
+<template>
+  <Teleport to="body">
+    <div
+      v-if="dialogState.open.value && dialogState.options.value"
+      class="modal-mask"
+      tabindex="-1"
+      @keydown="onMaskKeydown"
+      @click.self="resolveDialog({ ok: false, value: '' })"
+    >
+      <div class="modal app-dialog">
+        <h3>{{ dialogState.options.value.title }}</h3>
+        <p v-if="dialogState.options.value.message" class="modal-tip">{{ dialogState.options.value.message }}</p>
+        <div v-if="dialogState.options.value.type === 'prompt'" class="form-row">
+          <input
+            ref="inputRef"
+            v-model="inputValue"
+            :placeholder="dialogState.options.value.placeholder || ''"
+            @keydown.enter.prevent="resolveDialog({ ok: true, value: inputValue })"
+            @keydown.esc.prevent="resolveDialog({ ok: false, value: '' })"
+          />
+        </div>
+        <div class="modal-actions">
+          <button v-if="dialogState.options.value.type !== 'alert'" class="btn" @click="resolveDialog({ ok: false, value: '' })">取消</button>
+          <button
+            class="btn"
+            :class="dialogState.options.value.danger ? 'danger' : 'primary'"
+            @click="resolveDialog({ ok: true, value: inputValue })"
+          >{{ dialogState.options.value.okText || '确定' }}</button>
+        </div>
+      </div>
+    </div>
+  </Teleport>
+</template>
diff --git a/src/components/editor/ThumbBar.vue b/src/components/editor/ThumbBar.vue
index e00d98a..344357e 100644
--- a/src/components/editor/ThumbBar.vue
+++ b/src/components/editor/ThumbBar.vue
@@ -4,6 +4,7 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import { store, resolveBg } from '../../core/store'
+import { appConfirm } from '../../core/dialog'
 import ElementView from './ElementView.vue'
 
 const slides = computed(() => store.slides.value)
@@ -12,9 +13,11 @@ const currentIndex = computed(() => store.currentIndex.value)
 function onClickItem(i: number) {
   store.setCurrentIndex(i)
 }
-function onClickDel(i: number, e: Event) {
+async function onClickDel(i: number, e: Event) {
   e.stopPropagation()
-  store.delSlide(i)
+  if (await appConfirm('删除这页幻灯片？', '第 ' + (i + 1) + ' 页，可用 Ctrl+Z 撤销', { danger: true, okText: '删除' })) {
+    store.delSlide(i)
+  }
 }
 function onClickAdd() {
   store.addSlide(store.getCurrentIndex())
@@ -41,6 +44,7 @@ function onClickAdd() {
               :key="el.id"
               :el="el"
               :bg="slide.background"
+              thumb
             />
           </div>
         </div>
diff --git a/src/components/editor/Toolbar.vue b/src/components/editor/Toolbar.vue
index 83d2adb..e9bc996 100644
--- a/src/components/editor/Toolbar.vue
+++ b/src/components/editor/Toolbar.vue
@@ -6,6 +6,7 @@
 import { ref, computed, watch, onMounted, onUnmounted } from 'vue'
 import { store } from '../../core/store'
 import { themes } from '../../core/sample'
+import { appConfirm } from '../../core/dialog'
 
 const emit = defineEmits<{
   (e: 'present'): void
@@ -29,15 +30,17 @@ function onThemeChange() {
   store.setTheme(currentTheme.value)
 }
 
-function action(a: string) {
+async function action(a: string) {
   switch (a) {
     case 'add-slide': store.addSlide(store.getCurrentIndex()); break
     case 'dup-slide': store.dupSlide(); break
     case 'del-slide':
-      if (store.delSlide()) { /* ok */ }
+      if (await appConfirm('删除这页幻灯片？', '第 ' + (store.getCurrentIndex() + 1) + ' 页，可用 Ctrl+Z 撤销', { danger: true, okText: '删除' })) {
+        store.delSlide()
+      }
       break
     case 'reset':
-      if (confirm('重置为内置示例？当前编辑内容将丢失（可用 Ctrl+Z 撤销）。')) {
+      if (await appConfirm('重置为内置示例？', '当前编辑内容将丢失（可用 Ctrl+Z 撤销）', { danger: true })) {
         store.reset()
       }
       break
diff --git a/src/components/modals/LibraryModal.vue b/src/components/modals/LibraryModal.vue
index b15d410..0fb307c 100644
--- a/src/components/modals/LibraryModal.vue
+++ b/src/components/modals/LibraryModal.vue
@@ -5,6 +5,7 @@
 import { ref, computed, watch } from 'vue'
 import type { LibItem, Slide } from '../../core/types'
 import { store, resolveBg } from '../../core/store'
+import { appPrompt, appConfirm } from '../../core/dialog'
 import ElementView from '../editor/ElementView.vue'
 
 const props = defineProps<{ visible: boolean }>()
@@ -91,9 +92,9 @@ function onOpen(id: string) {
   }
 }
 
-function onRename(id: string) {
+async function onRename(id: string) {
   const cur = store.getLibrary().find(x => x.id === id)
-  const name = prompt('重命名为', cur ? cur.name : '')
+  const name = await appPrompt('重命名', { defaultValue: cur ? cur.name : '' })
   if (name != null && name.trim()) {
     store.renameInLibrary(id, name.trim())
     bump()
@@ -106,8 +107,8 @@ function onDuplicate(id: string) {
   bump()
 }
 
-function onDelete(id: string) {
-  if (confirm('删除这份演示？此操作不可撤销。')) {
+async function onDelete(id: string) {
+  if (await appConfirm('删除这份演示？', '此操作不可撤销', { danger: true, okText: '删除' })) {
     store.deleteFromLibrary(id)
     toast('已删除')
     bump()
diff --git a/src/components/modals/TemplateModal.vue b/src/components/modals/TemplateModal.vue
index a80bf65..dc43a40 100644
--- a/src/components/modals/TemplateModal.vue
+++ b/src/components/modals/TemplateModal.vue
@@ -4,6 +4,7 @@
 <script setup lang="ts">
 import { ref, computed } from 'vue'
 import { store, resolveBg } from '../../core/store'
+import { appConfirm } from '../../core/dialog'
 import type { PageTemplate } from '../../core/types'
 import ElementView from '../editor/ElementView.vue'
 
@@ -65,8 +66,8 @@ function onPick(tpl: PageTemplate) {
 }
 
 /* ---------- 删除自存模板 ---------- */
-function onDelete(tpl: PageTemplate) {
-  if (confirm('删除模板「' + tpl.name + '」？')) {
+async function onDelete(tpl: PageTemplate) {
+  if (await appConfirm('删除模板', '「' + tpl.name + '」删除后不可恢复', { danger: true, okText: '删除' })) {
     store.deleteTemplate(tpl.id)
     bump()
     emit('toast', '已删除')
@@ -162,20 +163,24 @@ function onDelete(tpl: PageTemplate) {
 .tpl-grid {
   display: grid;
   grid-template-columns: repeat(3, 1fr);
-  gap: 1em;
+  gap: 12px;
 }
 
+/* 卡片宽 ≈ (720 - 48 padding - 2×12 gap) / 3 ≈ 212px → scale = 212/1280 ≈ 0.166 */
 .tpl-card {
+  --tpl-scale: 0.166;
   cursor: pointer;
   border-radius: 8px;
   overflow: hidden;
   background: #fff;
-  border: 2px solid rgba(100, 116, 139, .2);
-  transition: border-color .15s, transform .15s;
+  border: 1px solid var(--ui-border, #e2e8f0);
+  box-shadow: 0 1px 3px rgba(15, 23, 42, .06);
+  transition: border-color .15s, transform .15s, box-shadow .15s;
 }
 
 .tpl-card:hover {
-  border-color: var(--primary, #4f46e5);
+  border-color: var(--ui-primary, #4f46e5);
+  box-shadow: 0 4px 12px rgba(15, 23, 42, .12);
   transform: translateY(-2px);
 }
 
@@ -192,7 +197,7 @@ function onDelete(tpl: PageTemplate) {
   left: 0;
   width: 1280px;
   height: 720px;
-  transform: scale(0.094);  /* 约 120px 宽 */
+  transform: scale(var(--tpl-scale));
   transform-origin: top left;
   pointer-events: none;
 }
@@ -201,25 +206,29 @@ function onDelete(tpl: PageTemplate) {
   display: flex;
   align-items: center;
   gap: .4em;
-  padding: .5em .6em;
+  padding: .45em .6em;
   font-size: 13px;
 }
 
 .tpl-name {
   flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
 }
 
 .tpl-badge {
   font-size: 11px;
   padding: 1px 6px;
-  border-radius: 3px;
+  border-radius: 4px;
   background: rgba(100, 116, 139, .15);
-  color: var(--muted, #64748b);
+  color: var(--ui-muted, #64748b);
+  flex: none;
 }
 
 .tpl-badge.user {
-  background: rgba(79, 70, 229, .12);
-  color: var(--primary, #4f46e5);
+  background: var(--ui-primary-soft, #eef2ff);
+  color: var(--ui-primary, #4f46e5);
 }
 
 .tpl-del {
@@ -227,10 +236,13 @@ function onDelete(tpl: PageTemplate) {
   opacity: .5;
   cursor: pointer;
   padding: 2px 4px;
+  border: none;
+  background: transparent;
+  flex: none;
 }
 
 .tpl-del:hover {
   opacity: 1;
-  color: #e11d48;
+  color: var(--ui-danger, #e11d48);
 }
 </style>
diff --git a/src/core/dialog.ts b/src/core/dialog.ts
new file mode 100644
index 0000000..8dc39cd
--- /dev/null
+++ b/src/core/dialog.ts
@@ -0,0 +1,66 @@
+/* =====================================================================
+ * dialog.ts — 全局对话框服务（替代原生 alert/confirm/prompt）
+ *
+ * Promise 风格：await appConfirm('删除？') → boolean
+ * 渲染走 AppDialogHost（主 app 内 Teleport 到 body），
+ * App.vue 模板放置 <AppDialogHost /> 即接线，无需手动 mount
+ * ===================================================================== */
+import { ref } from 'vue'
+
+export interface DialogOptions {
+  type: 'alert' | 'confirm' | 'prompt'
+  title: string
+  message?: string
+  /** prompt 默认值 */
+  defaultValue?: string
+  /** input placeholder */
+  placeholder?: string
+  /** 确认按钮文案（默认「确定」） */
+  okText?: string
+  /** 危险操作样式（确认按钮红色） */
+  danger?: boolean
+}
+
+interface DialogResult { ok: boolean; value: string }
+type Resolver = (r: DialogResult) => void
+
+/* ---------- 模块级响应式状态（AppDialogHost 渲染消费） ---------- */
+export const dialogState = {
+  open: ref(false),
+  options: ref<DialogOptions | null>(null)
+}
+
+let resolver: Resolver | null = null
+
+/** 由 AppDialogHost 的 close 事件回调 */
+export function resolveDialog(r: DialogResult) {
+  dialogState.open.value = false
+  dialogState.options.value = null
+  if (resolver) { resolver(r); resolver = null }
+}
+
+function show(opts: DialogOptions): Promise<DialogResult> {
+  return new Promise(resolve => {
+    resolver = resolve
+    dialogState.options.value = opts
+    dialogState.open.value = true
+  })
+}
+
+/* ---------- 对外 API ---------- */
+
+/** 信息提示（替代 alert） */
+export function appAlert(title: string, message?: string) {
+  return show({ type: 'alert', title, message })
+}
+
+/** 确认（替代 confirm）→ Promise<boolean> */
+export function appConfirm(title: string, message?: string, opts?: { okText?: string; danger?: boolean }) {
+  return show({ type: 'confirm', title, message, okText: opts?.okText, danger: opts?.danger }).then(r => r.ok)
+}
+
+/** 输入（替代 prompt）→ Promise<string | null>（取消为 null） */
+export function appPrompt(title: string, opts?: { message?: string; defaultValue?: string; placeholder?: string }) {
+  return show({ type: 'prompt', title, message: opts?.message, defaultValue: opts?.defaultValue, placeholder: opts?.placeholder })
+    .then(r => (r.ok ? r.value : null))
+}
diff --git a/tests/dialog.test.ts b/tests/dialog.test.ts
new file mode 100644
index 0000000..c4f5337
--- /dev/null
+++ b/tests/dialog.test.ts
@@ -0,0 +1,66 @@
+/* dialog.test.ts — 全局对话框服务与宿主组件闭环验证（Teleport 后从 document 查询） */
+import { describe, it, expect } from 'vitest'
+import { mount, flushPromises } from '@vue/test-utils'
+import AppDialog from '../src/components/common/AppDialog.vue'
+import { appAlert, appConfirm, appPrompt, dialogState, resolveDialog } from '../src/core/dialog'
+
+/** 触发 body 上（Teleport）按钮点击 */
+function clickBtn(idx: number) {
+  const btns = document.body.querySelectorAll('.modal-actions button')
+  ;(btns[idx] as HTMLElement).click()
+}
+
+describe('dialog 服务 + AppDialog 宿主', () => {
+  it('appPrompt 打开对话框 → 输入值提交', async () => {
+    const wrapper = mount(AppDialog, { attachTo: document.body })
+    const p = appPrompt('生成整套', { placeholder: '主题' })
+    await flushPromises()
+    expect(dialogState.open.value).toBe(true)
+    const input = document.body.querySelector('.modal-mask input') as HTMLInputElement
+    expect(input).not.toBeNull()
+    input.value = '远程办公'
+    input.dispatchEvent(new Event('input'))
+    await flushPromises()
+    clickBtn(1) // 确定
+    await expect(p).resolves.toBe('远程办公')
+    expect(dialogState.open.value).toBe(false)
+    wrapper.unmount()
+  })
+
+  it('appConfirm 取消 → false；确定 → true', async () => {
+    const wrapper = mount(AppDialog, { attachTo: document.body })
+    const p1 = appConfirm('删除？', '不可恢复', { danger: true })
+    await flushPromises()
+    clickBtn(0) // 取消
+    await expect(p1).resolves.toBe(false)
+
+    const p2 = appConfirm('删除？')
+    await flushPromises()
+    clickBtn(1) // 确定
+    await expect(p2).resolves.toBe(true)
+    wrapper.unmount()
+  })
+
+  it('appAlert 无输入框，单按钮关闭', async () => {
+    const wrapper = mount(AppDialog, { attachTo: document.body })
+    const p = appAlert('提示', '内容')
+    await flushPromises()
+    expect(document.body.querySelector('.modal-mask input')).toBeNull()
+    expect(document.body.querySelectorAll('.modal-actions button').length).toBe(1)
+    clickBtn(0)
+    await expect(p).resolves.toEqual({ ok: true, value: '' })
+    wrapper.unmount()
+  })
+
+  it('对话框 DOM 挂到 body（Teleport）且带 modal-mask/modal 类', async () => {
+    const wrapper = mount(AppDialog, { attachTo: document.body })
+    appAlert('标题')
+    await flushPromises()
+    const mask = document.body.querySelector('.modal-mask')
+    expect(mask).not.toBeNull()
+    expect(mask!.querySelector('.modal')).not.toBeNull()
+    resolveDialog({ ok: true, value: '' })
+    await flushPromises()
+    wrapper.unmount()
+  })
+})
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..81334c1
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,9 @@
+import { defineConfig } from 'vitest/config'
+import vue from '@vitejs/plugin-vue'
+
+export default defineConfig({
+  plugins: [vue()],
+  test: {
+    environment: 'jsdom',
+  },
+})