diff --git a/docs/design/README.md b/docs/design/README.md
index aaac0fbf..e365c5e8 100644
--- a/docs/design/README.md
+++ b/docs/design/README.md
@@ -11,6 +11,7 @@
 - [CUSTOM_WORLD_SELF_OWNED_SETTING_LAYER_OPTIMIZATION_2026-04-08.md](./CUSTOM_WORLD_SELF_OWNED_SETTING_LAYER_OPTIMIZATION_2026-04-08.md)：把模板依赖逐步迁成自定义世界自有设定层，并保证不破坏当前生成流程的优化方案。
 - [MOBILE_CREATION_NEW_WORK_COMPACT_LAYOUT_2026-04-24.md](./MOBILE_CREATION_NEW_WORK_COMPACT_LAYOUT_2026-04-24.md)：移动端创作页新建作品模块最多占用首屏约 1/3 高度的紧凑布局设计。
 - [PLATFORM_CATEGORY_AND_CREATE_TAB_DESIGN_2026-04-24.md](./PLATFORM_CATEGORY_AND_CREATE_TAB_DESIGN_2026-04-24.md)：平台入口新增分类 Tab、登录态导航裁剪与创作 Tab 视觉强化设计。
+- [UNIFIED_MODAL_WINDOW_DESIGN_2026-04-25.md](./UNIFIED_MODAL_WINDOW_DESIGN_2026-04-25.md)：统一平台风与 RPG 像素风模态窗口外壳、交互边界和迁移顺序。
 - [AI_NATIVE_RUNTIME_ITEM_SYSTEM_REDESIGN_2026-04-02.md](./AI_NATIVE_RUNTIME_ITEM_SYSTEM_REDESIGN_2026-04-02.md)：运行时物品生成系统重设计。
 - [LEVEL_PROGRESS_AND_CHAPTER_NPC_AUTO_SCALING_DESIGN_2026-04-20.md](./LEVEL_PROGRESS_AND_CHAPTER_NPC_AUTO_SCALING_DESIGN_2026-04-20.md)：等级成长、章节经验节奏与 NPC 自动定级设计。
 - [RPG_NARRATIVE_PLANNING_FULL_PIPELINE_WORKFLOW_2026-04-12.md](./RPG_NARRATIVE_PLANNING_FULL_PIPELINE_WORKFLOW_2026-04-12.md)：专业剧情策划构建 RPG 游戏全剧情的工作流程与交付模板。
diff --git a/docs/design/UNIFIED_MODAL_WINDOW_DESIGN_2026-04-25.md b/docs/design/UNIFIED_MODAL_WINDOW_DESIGN_2026-04-25.md
new file mode 100644
index 00000000..f18dd21e
--- /dev/null
+++ b/docs/design/UNIFIED_MODAL_WINDOW_DESIGN_2026-04-25.md
@@ -0,0 +1,93 @@
+# 统一模态窗口设计 2026-04-25
+
+## 背景
+
+当前前端已有两套稳定视觉资产：
+
+- 平台侧：`platform-overlay`、`platform-modal-shell`、`platform-auth-card` 等主题变量。
+- RPG 运行时：`pixel-nine-slice`、`pixel-modal-shell` 与 `UI_CHROME.modalPanel` 九宫格边框。
+
+但弹窗结构仍分散在业务组件内，常见重复包括遮罩层、点击遮罩关闭、`role="dialog"`、`aria-modal`、移动端底部贴边、桌面居中、最大高度、滚动区域和关闭按钮。新增弹窗时容易出现 z-index、无障碍属性、移动端高度和视觉边界不一致。
+
+## 目标
+
+新增统一组件 `UnifiedModal`，只负责弹窗外壳和交互边界，不接管业务内容：
+
+- 统一遮罩、面板、标题区、内容区、底部区结构。
+- 支持平台风与像素风两种外观，不混用两套视觉资产。
+- 默认移动端优先，平台风移动端底部弹出、桌面居中；像素风保持游戏内居中弹窗。
+- 默认提供 `role="dialog"`、`aria-modal`、标题关联、Escape 关闭和遮罩点击关闭。
+- 支持禁用关闭，用于生成中、保存中等不可打断流程。
+- 支持 Portal 渲染到 `document.body`，避免被父层 `overflow` 裁剪。
+
+## 非目标
+
+- 不一次性迁移所有旧弹窗，避免运行时大面积回归。
+- 不把业务按钮、表单、状态文案放进通用组件。
+- 不改变现有主题变量、九宫格素材、平台和 RPG 的视觉风格。
+- 不新增第三方弹窗库。
+
+## 组件接口
+
+`UnifiedModal` 核心参数：
+
+| 参数 | 说明 |
+| --- | --- |
+| `open` | 是否显示。为 `false` 时返回 `null`。 |
+| `variant` | `platform` 或 `pixel`。默认 `platform`。 |
+| `title` | 标题，同时作为默认 `aria-label` 来源。 |
+| `description` | 可选副标题，显示在标题下方。 |
+| `children` | 主内容区。 |
+| `footer` | 可选底部操作区。 |
+| `onClose` | 关闭回调。 |
+| `closeDisabled` | 禁止遮罩、Escape 和关闭按钮触发关闭。 |
+| `closeOnBackdrop` | 是否允许点击遮罩关闭，默认允许。 |
+| `showCloseButton` | 是否显示右上关闭按钮，默认显示。 |
+| `size` | `sm`、`md`、`lg`、`xl`、`fullscreen`。 |
+| `zIndexClassName` | z-index class，默认 `z-[90]`。 |
+| `panelClassName` / `bodyClassName` / `footerClassName` | 局部样式扩展。 |
+| `portal` | 是否渲染到 `document.body`，默认开启。 |
+
+## 使用边界
+
+### 平台风弹窗
+
+用于平台首页、登录注册、作品结果、创作工作台等非 RPG 运行时界面。
+
+要求：
+
+- 使用 `variant="platform"`。
+- 面板使用 `platform-modal-shell` 主题变量。
+- 移动端优先底部贴边，大屏居中。
+- 不在弹窗内放功能说明式长文案，只放任务所需信息。
+
+### 像素风弹窗
+
+用于 RPG 运行时、地图、背包、角色详情、NPC 交易等游戏内面板。
+
+要求：
+
+- 使用 `variant="pixel"`。
+- 面板使用 `pixel-nine-slice pixel-modal-shell`。
+- 默认使用 `getNineSliceStyle(UI_CHROME.modalPanel)`。
+- 标题、内容和底部仍由业务方控制，避免通用组件内写入玩法解释。
+
+## 首批迁移
+
+首批只迁移平台入口创作类型弹窗：
+
+- 文件：`src/components/platform-entry/PlatformEntryCreationTypeModal.tsx`
+- 目的：验证平台风布局、关闭禁用、标题区、内容区与错误区都可由统一组件承载。
+
+后续可按风险由低到高迁移：
+
+1. 结果页小弹窗：`PuzzleResultView`、`BigFishResultView`。
+2. 平台创作页编辑器弹窗：`RpgCreationEntityEditorShared` 内局部 `ModalShell`。
+3. RPG 运行时像素风弹窗：`RpgAdventurePanelOverlays`、`AdventureEntityModal`、`NpcModals`。
+
+## 验收标准
+
+- 新增弹窗优先使用 `UnifiedModal`，不再手写完整 overlay + panel 结构。
+- 迁移后的弹窗保留原有移动端和桌面布局。
+- 关闭按钮、遮罩关闭、Escape 行为一致，`closeDisabled` 时都不会关闭。
+- 类型检查、编码检查通过。
diff --git a/src/components/big-fish-result/BigFishResultView.tsx b/src/components/big-fish-result/BigFishResultView.tsx
index 27447760..83829875 100644
--- a/src/components/big-fish-result/BigFishResultView.tsx
+++ b/src/components/big-fish-result/BigFishResultView.tsx
@@ -16,6 +16,7 @@ import type {
   BigFishSessionSnapshotResponse,
   ExecuteBigFishActionRequest,
 } from '../../../packages/shared/src/contracts/bigFish';
+import { UnifiedModal } from '../common/UnifiedModal';
 import { ResolvedAssetImage } from '../ResolvedAssetImage';
 
 type BigFishAssetStudioTarget =
@@ -537,38 +538,37 @@ function BigFishResultErrorModal({
   onClose: () => void;
 }) {
   return (
-    <div className="fixed inset-0 z-[160] flex items-center justify-center bg-slate-950/58 px-4 py-6 backdrop-blur-sm">
-      <div
-        role="dialog"
-        aria-modal="true"
-        aria-labelledby="big-fish-result-error-title"
-        className="w-full max-w-sm rounded-[1.6rem] border border-red-100/80 bg-white p-5 text-slate-950 shadow-2xl"
-      >
-        <div className="flex items-start gap-3">
-          <div className="mt-0.5 inline-flex h-9 w-9 shrink-0 items-center justify-center rounded-full bg-red-50 text-red-600">
-            <Waves className="h-4 w-4" />
-          </div>
-          <div className="min-w-0 flex-1">
-            <div
-              id="big-fish-result-error-title"
-              className="text-base font-black text-slate-950"
-            >
-              发布失败
-            </div>
-            <div className="mt-2 text-sm leading-6 text-slate-600">
-              {message}
-            </div>
-          </div>
-        </div>
+    <UnifiedModal
+      open
+      title="发布失败"
+      onClose={onClose}
+      closeOnBackdrop={false}
+      showCloseButton={false}
+      size="sm"
+      zIndexClassName="z-[160]"
+      overlayClassName="bg-slate-950/58"
+      panelClassName="border-red-100/80 bg-white text-slate-950 shadow-2xl"
+      bodyClassName="p-5"
+      footer={(
         <button
           type="button"
           onClick={onClose}
-          className="mt-5 inline-flex w-full items-center justify-center rounded-full bg-slate-950 px-4 py-2.5 text-sm font-bold text-white"
+          className="inline-flex w-full items-center justify-center rounded-full bg-slate-950 px-4 py-2.5 text-sm font-bold text-white"
         >
           知道了
         </button>
+      )}
+      footerClassName="border-t-0 px-5 pb-5 pt-0"
+    >
+      <div className="flex items-start gap-3">
+        <div className="mt-0.5 inline-flex h-9 w-9 shrink-0 items-center justify-center rounded-full bg-red-50 text-red-600">
+          <Waves className="h-4 w-4" />
+        </div>
+        <div className="min-w-0 flex-1 text-sm leading-6 text-slate-600">
+          {message}
+        </div>
       </div>
-    </div>
+    </UnifiedModal>
   );
 }
 
diff --git a/src/components/common/UnifiedModal.test.tsx b/src/components/common/UnifiedModal.test.tsx
new file mode 100644
index 00000000..29997ac7
--- /dev/null
+++ b/src/components/common/UnifiedModal.test.tsx
@@ -0,0 +1,58 @@
+/* @vitest-environment jsdom */
+
+import { fireEvent, render, screen } from '@testing-library/react';
+import { expect, test, vi } from 'vitest';
+
+import { UnifiedModal } from './UnifiedModal';
+
+test('renders an accessible platform modal', () => {
+  render(
+    <UnifiedModal open title="统一弹窗" onClose={() => {}} portal={false}>
+      <div>窗口内容</div>
+    </UnifiedModal>,
+  );
+
+  expect(screen.getByRole('dialog', { name: '统一弹窗' })).toBeTruthy();
+  expect(screen.getByText('窗口内容')).toBeTruthy();
+});
+
+test('closes through backdrop and escape', () => {
+  const onClose = vi.fn();
+  const { rerender } = render(
+    <UnifiedModal open title="统一弹窗" onClose={onClose} portal={false}>
+      <div>窗口内容</div>
+    </UnifiedModal>,
+  );
+
+  fireEvent.click(screen.getByRole('dialog').parentElement as HTMLElement);
+  expect(onClose).toHaveBeenCalledTimes(1);
+
+  rerender(
+    <UnifiedModal open title="统一弹窗" onClose={onClose} portal={false}>
+      <div>窗口内容</div>
+    </UnifiedModal>,
+  );
+  fireEvent.keyDown(window, { key: 'Escape' });
+  expect(onClose).toHaveBeenCalledTimes(2);
+});
+
+test('respects closeDisabled for every default close path', () => {
+  const onClose = vi.fn();
+  render(
+    <UnifiedModal
+      open
+      title="生成中"
+      onClose={onClose}
+      closeDisabled
+      portal={false}
+    >
+      <div>窗口内容</div>
+    </UnifiedModal>,
+  );
+
+  fireEvent.click(screen.getByRole('dialog').parentElement as HTMLElement);
+  fireEvent.keyDown(window, { key: 'Escape' });
+  fireEvent.click(screen.getByRole('button', { name: '关闭' }));
+
+  expect(onClose).not.toHaveBeenCalled();
+});
diff --git a/src/components/common/UnifiedModal.tsx b/src/components/common/UnifiedModal.tsx
new file mode 100644
index 00000000..ed442562
--- /dev/null
+++ b/src/components/common/UnifiedModal.tsx
@@ -0,0 +1,220 @@
+import { X } from 'lucide-react';
+import {
+  type CSSProperties,
+  type ReactNode,
+  useEffect,
+  useId,
+} from 'react';
+import { createPortal } from 'react-dom';
+
+import { getNineSliceStyle, UI_CHROME } from '../../uiAssets';
+
+type UnifiedModalVariant = 'platform' | 'pixel';
+type UnifiedModalSize = 'sm' | 'md' | 'lg' | 'xl' | 'fullscreen';
+
+type UnifiedModalProps = {
+  open: boolean;
+  title: string;
+  description?: ReactNode;
+  children: ReactNode;
+  footer?: ReactNode;
+  onClose: () => void;
+  variant?: UnifiedModalVariant;
+  size?: UnifiedModalSize;
+  closeDisabled?: boolean;
+  closeOnBackdrop?: boolean;
+  showCloseButton?: boolean;
+  closeLabel?: string;
+  portal?: boolean;
+  zIndexClassName?: string;
+  overlayClassName?: string;
+  panelClassName?: string;
+  headerClassName?: string;
+  bodyClassName?: string;
+  footerClassName?: string;
+  panelStyle?: CSSProperties;
+};
+
+const PLATFORM_SIZE_CLASS: Record<UnifiedModalSize, string> = {
+  sm: 'max-w-md',
+  md: 'max-w-xl',
+  lg: 'max-w-3xl',
+  xl: 'max-w-5xl',
+  fullscreen: 'max-w-[min(100vw,76rem)] sm:h-[min(92vh,60rem)]',
+};
+
+const PIXEL_SIZE_CLASS: Record<UnifiedModalSize, string> = {
+  sm: 'max-w-sm',
+  md: 'max-w-md',
+  lg: 'max-w-3xl',
+  xl: 'max-w-5xl',
+  fullscreen: 'max-w-[min(96vw,64rem)]',
+};
+
+function joinClassNames(...classNames: Array<string | false | null | undefined>) {
+  return classNames.filter(Boolean).join(' ');
+}
+
+function getPanelStyle(
+  variant: UnifiedModalVariant,
+  panelStyle: CSSProperties | undefined,
+) {
+  if (variant !== 'pixel') {
+    return panelStyle;
+  }
+
+  return {
+    ...getNineSliceStyle(UI_CHROME.modalPanel),
+    ...panelStyle,
+  };
+}
+
+function UnifiedModalContent({
+  open,
+  title,
+  description,
+  children,
+  footer,
+  onClose,
+  variant = 'platform',
+  size = 'md',
+  closeDisabled = false,
+  closeOnBackdrop = true,
+  showCloseButton = true,
+  closeLabel = '关闭',
+  zIndexClassName = 'z-[90]',
+  overlayClassName,
+  panelClassName,
+  headerClassName,
+  bodyClassName,
+  footerClassName,
+  panelStyle,
+}: Omit<UnifiedModalProps, 'portal'>) {
+  const titleId = useId();
+  const descriptionId = useId();
+
+  useEffect(() => {
+    if (!open || closeDisabled) {
+      return;
+    }
+
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.key === 'Escape') {
+        onClose();
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [closeDisabled, onClose, open]);
+
+  if (!open) {
+    return null;
+  }
+
+  const isPixel = variant === 'pixel';
+  const sizeClassName = isPixel
+    ? PIXEL_SIZE_CLASS[size]
+    : PLATFORM_SIZE_CLASS[size];
+
+  const overlayClasses = isPixel
+    ? 'fixed inset-0 flex items-center justify-center bg-black/72 p-3 backdrop-blur-sm sm:p-4'
+    : 'platform-overlay fixed inset-0 flex items-end justify-center p-3 backdrop-blur-sm sm:items-center sm:p-4';
+
+  const panelClasses = isPixel
+    ? 'pixel-nine-slice pixel-modal-shell flex max-h-[min(92vh,58rem)] w-full flex-col overflow-hidden shadow-[0_24px_80px_rgba(0,0,0,0.55)]'
+    : 'platform-modal-shell flex max-h-[min(92vh,58rem)] w-full flex-col overflow-hidden rounded-t-[1.75rem] sm:rounded-[1.75rem]';
+
+  const headerClasses = isPixel
+    ? 'flex items-start justify-between gap-3 border-b border-white/10 px-4 py-3 sm:px-5 sm:py-4'
+    : 'flex items-start justify-between gap-3 border-b border-[var(--platform-subpanel-border)] px-4 py-4 sm:px-5';
+
+  const titleClasses = isPixel
+    ? 'truncate text-sm font-semibold text-white'
+    : 'text-base font-semibold text-[var(--platform-text-strong)]';
+
+  const descriptionClasses = isPixel
+    ? 'mt-1 text-xs leading-5 text-zinc-400'
+    : 'mt-1 text-xs leading-5 text-[var(--platform-text-base)]';
+
+  const bodyClasses = isPixel
+    ? 'min-h-0 flex-1 overflow-y-auto p-4 sm:p-5'
+    : 'min-h-0 flex-1 overflow-y-auto px-4 py-4 sm:px-5 sm:py-5';
+
+  const footerClasses = isPixel
+    ? 'flex flex-wrap items-center justify-end gap-3 border-t border-white/10 px-4 py-3 sm:px-5 sm:py-4'
+    : 'flex flex-wrap items-center justify-end gap-3 border-t border-[var(--platform-subpanel-border)] px-4 py-4 sm:px-5';
+
+  const closeButtonClasses = isPixel
+    ? 'rounded-full border border-white/10 bg-black/20 p-2 text-zinc-400 transition-colors hover:text-white disabled:cursor-not-allowed disabled:opacity-45'
+    : 'platform-icon-button disabled:cursor-not-allowed disabled:opacity-45';
+
+  return (
+    <div
+      className={joinClassNames(overlayClasses, zIndexClassName, overlayClassName)}
+      onClick={(event) => {
+        if (
+          closeOnBackdrop &&
+          !closeDisabled &&
+          event.target === event.currentTarget
+        ) {
+          onClose();
+        }
+      }}
+    >
+      <div
+        role="dialog"
+        aria-modal="true"
+        aria-labelledby={titleId}
+        aria-describedby={description ? descriptionId : undefined}
+        className={joinClassNames(panelClasses, sizeClassName, panelClassName)}
+        style={getPanelStyle(variant, panelStyle)}
+        onClick={(event) => event.stopPropagation()}
+      >
+        <div className={joinClassNames(headerClasses, headerClassName)}>
+          <div className="min-w-0">
+            <div id={titleId} className={titleClasses}>
+              {title}
+            </div>
+            {description ? (
+              <div id={descriptionId} className={descriptionClasses}>
+                {description}
+              </div>
+            ) : null}
+          </div>
+          {showCloseButton ? (
+            <button
+              type="button"
+              aria-label={closeLabel}
+              onClick={onClose}
+              disabled={closeDisabled}
+              className={closeButtonClasses}
+            >
+              <X className="h-4 w-4" />
+            </button>
+          ) : null}
+        </div>
+        <div className={joinClassNames(bodyClasses, bodyClassName)}>
+          {children}
+        </div>
+        {footer ? (
+          <div className={joinClassNames(footerClasses, footerClassName)}>
+            {footer}
+          </div>
+        ) : null}
+      </div>
+    </div>
+  );
+}
+
+/**
+ * 统一模态窗口外壳。
+ * 业务组件只传入标题、内容和操作区；遮罩、无障碍属性、Escape 与移动端布局在这里收口。
+ */
+export function UnifiedModal({ portal = true, ...props }: UnifiedModalProps) {
+  if (!portal || typeof document === 'undefined') {
+    return <UnifiedModalContent {...props} />;
+  }
+
+  return createPortal(<UnifiedModalContent {...props} />, document.body);
+}
diff --git a/src/components/platform-entry/PlatformEntryCreationTypeModal.tsx b/src/components/platform-entry/PlatformEntryCreationTypeModal.tsx
index 5dc2fddb..fdde7c8b 100644
--- a/src/components/platform-entry/PlatformEntryCreationTypeModal.tsx
+++ b/src/components/platform-entry/PlatformEntryCreationTypeModal.tsx
@@ -1,5 +1,6 @@
-import { ArrowRight, X } from 'lucide-react';
+import { ArrowRight } from 'lucide-react';
 
+import { UnifiedModal } from '../common/UnifiedModal';
 import { PLATFORM_CREATION_TYPES } from './platformEntryCreationTypes';
 
 export interface PlatformEntryCreationTypeModalProps {
@@ -79,58 +80,40 @@ export function PlatformEntryCreationTypeModal({
   }
 
   return (
-    <div className="platform-overlay fixed inset-0 z-[90] flex items-end justify-center p-3 backdrop-blur-sm sm:items-center sm:p-4">
-      <div className="platform-modal-shell w-full max-w-3xl overflow-hidden rounded-[1.8rem]">
-        <div className="bg-transparent">
-          <div className="flex items-start justify-between gap-3 border-b border-[var(--platform-subpanel-border)] px-4 py-4 sm:px-5">
-            <div>
-              <div className="text-base font-semibold text-[var(--platform-text-strong)]">
-                选择创作类型
-              </div>
-              <div className="mt-1 text-xs text-[var(--platform-text-base)]">
-                先选玩法类型，再进入对应创作工作台。
-              </div>
-            </div>
-            <button
-              type="button"
-              onClick={onClose}
-              disabled={isBusy}
-              className="platform-icon-button disabled:cursor-not-allowed disabled:opacity-45"
-            >
-              <X className="h-4 w-4" />
-            </button>
-          </div>
-
-          <div className="px-4 py-4 sm:px-5 sm:py-5">
-            <div className="grid gap-3 sm:grid-cols-5">
-              {PLATFORM_CREATION_TYPES.map((item) => (
-                <CreationTypeCard
-                  key={item.id}
-                  item={item}
-                  busy={isBusy}
-                  onSelect={() => {
-                    if (item.id === 'rpg') {
-                      onSelectRpg();
-                    }
-                    if (item.id === 'big-fish') {
-                      onSelectBigFish();
-                    }
-                    if (item.id === 'puzzle') {
-                      onSelectPuzzle();
-                    }
-                  }}
-                />
-              ))}
-            </div>
-
-            {error ? (
-              <div className="platform-banner platform-banner--danger mt-4 rounded-[1.25rem] text-sm leading-6">
-                {error}
-              </div>
-            ) : null}
-          </div>
-        </div>
+    <UnifiedModal
+      open={isOpen}
+      title="选择创作类型"
+      description="先选玩法类型，再进入对应创作工作台。"
+      onClose={onClose}
+      closeDisabled={isBusy}
+      size="lg"
+    >
+      <div className="grid gap-3 sm:grid-cols-5">
+        {PLATFORM_CREATION_TYPES.map((item) => (
+          <CreationTypeCard
+            key={item.id}
+            item={item}
+            busy={isBusy}
+            onSelect={() => {
+              if (item.id === 'rpg') {
+                onSelectRpg();
+              }
+              if (item.id === 'big-fish') {
+                onSelectBigFish();
+              }
+              if (item.id === 'puzzle') {
+                onSelectPuzzle();
+              }
+            }}
+          />
+        ))}
       </div>
-    </div>
+
+      {error ? (
+        <div className="platform-banner platform-banner--danger mt-4 rounded-[1.25rem] text-sm leading-6">
+          {error}
+        </div>
+      ) : null}
+    </UnifiedModal>
   );
 }