diff --git a/document/app/[lang]/docs/layout.tsx b/document/app/[lang]/docs/layout.tsx
index 18942a7985..dc47719c01 100644
--- a/document/app/[lang]/docs/layout.tsx
+++ b/document/app/[lang]/docs/layout.tsx
@@ -7,10 +7,12 @@ import LogoLight from '@/components/docs/logo';
 import LogoDark from '@/components/docs/logoDark';
 import '@/app/global.css';
 import { CustomSidebarComponents } from '@/components/sideBar';
+import { SidebarKeepOpen } from '@/components/sidebarKeepOpen';
 import FeishuLogoLight from '@/components/docs/feishuLogoLIght';
 import FeishuLogoDark from '@/components/docs/feishuLogoDark';
 import GithubLogoLight from '@/components/docs/githubLogoLight';
 import GithubLogoDark from '@/components/docs/githubLogoDark';
+import { BookOpen, Code, Lightbulb, CircleHelp, Scale, History } from 'lucide-react';
 
 export default async function Layout({
   params,
@@ -21,33 +23,42 @@ export default async function Layout({
 }) {
   const { lang } = await params;
 
+  const iconClass = 'size-4';
   const tab = [
     {
+      icon: <BookOpen className={iconClass} />,
       title: t('common:introduction', lang),
       url: lang === 'zh-CN' ? '/docs/introduction' : '/en/docs/introduction'
     },
     {
+      icon: <Code className={iconClass} />,
       title: t('common:api_reference', lang),
       url: lang === 'zh-CN' ? '/docs/openapi' : '/en/docs/openapi'
     },
     {
+      icon: <Lightbulb className={iconClass} />,
       title: t('common:use-cases', lang),
       url: lang === 'zh-CN' ? '/docs/use-cases' : '/en/docs/use-cases'
     },
     {
+      icon: <CircleHelp className={iconClass} />,
       title: t('common:faq', lang),
       url: lang === 'zh-CN' ? '/docs/faq' : '/en/docs/faq'
     },
     {
+      icon: <Scale className={iconClass} />,
       title: t('common:protocol', lang),
       url: lang === 'zh-CN' ? '/docs/protocol' : '/en/docs/protocol'
     },
     {
+      icon: <History className={iconClass} />,
       title: t('common:upgrading', lang),
       url: lang === 'zh-CN' ? '/docs/upgrading' : '/en/docs/upgrading'
     }
   ];
 
+  const tabUrls = tab.map((t) => t.url);
+
   return (
     <DocsLayout
       {...baseOptions(lang)}
@@ -107,6 +118,7 @@ export default async function Layout({
       }}
       tabMode="navbar"
     >
+      <SidebarKeepOpen tabUrls={tabUrls} />
       {children}
     </DocsLayout>
   );
diff --git a/document/app/global.css b/document/app/global.css
index e2e9f427ec..727943768f 100644
--- a/document/app/global.css
+++ b/document/app/global.css
@@ -475,3 +475,65 @@ button[role='tab'] {
   padding-top: 16px;
   padding-bottom: 16px;
 }
+
+/* 移动端侧边栏 padding 缩小 */
+@media (max-width: 767px) {
+  #nd-sidebar-mobile [data-radix-scroll-area-viewport] {
+    padding-left: 8px;
+    padding-right: 8px;
+    padding-top: 0;
+  }
+
+  /* SidebarHeader 底部 padding */
+  #nd-sidebar-mobile > div:first-child {
+    padding-top: 8px;
+    padding-bottom: 22px;
+  }
+
+  /* 去掉 viewport 内部的顶部渐变遮罩 */
+  #nd-sidebar-mobile [data-radix-scroll-area-viewport] > div {
+    mask-image: linear-gradient(transparent, #fff 0px, #fff calc(100% - 12px), transparent) !important;
+    -webkit-mask-image: linear-gradient(transparent, #fff 0px, #fff calc(100% - 12px), transparent) !important;
+  }
+}
+
+/* RootToggle 图标容器：缩小到与图标匹配，修复对齐和间距 */
+#nd-sidebar-mobile .size-9,
+[data-radix-popper-content-wrapper] .size-9 {
+  width: 20px !important;
+  height: 20px !important;
+  flex-shrink: 0;
+  display: flex !important;
+  align-items: center;
+  justify-content: center;
+}
+
+/* RootToggle 下拉菜单：增加两侧 padding + 选中项浅蓝背景 */
+[data-radix-popper-content-wrapper] > div {
+  padding: 6px 8px !important;
+}
+
+[data-radix-popper-content-wrapper] a {
+  padding-left: 12px !important;
+  padding-right: 12px !important;
+  border-radius: 8px;
+}
+
+/* 移动端目录下拉框（TOC Popover Trigger）：文本溢出省略号 */
+@media (max-width: 767px) {
+  button[class*="tocnav"] {
+    max-width: 100vw;
+    overflow: hidden;
+  }
+
+  button[class*="tocnav"] > span.grid {
+    overflow: hidden;
+    min-width: 0;
+  }
+
+  /* 文章内超长链接/文本自动换行 */
+  article {
+    overflow-wrap: break-word;
+    word-break: break-word;
+  }
+}
diff --git a/document/components/sideBar.tsx b/document/components/sideBar.tsx
index 6f59b97015..95a0f376bb 100644
--- a/document/components/sideBar.tsx
+++ b/document/components/sideBar.tsx
@@ -71,7 +71,7 @@ const CustomFolder: FC<{ item: PageTree.Folder; level: number; children: ReactNo
 };
 
 const CustomSeparator: FC<{ item: PageTree.Separator }> = ({ item }) => (
-  <div className="text-sm font-semibold px-2 py-2 mt-4 mb-2">{item.name}</div>
+  <div className="text-sm font-semibold px-2 py-1.5 mt-1 mb-1 first:mt-0">{item.name}</div>
 );
 
 export const CustomSidebarComponents: SidebarComponents = {
diff --git a/document/components/sidebarKeepOpen.tsx b/document/components/sidebarKeepOpen.tsx
new file mode 100644
index 0000000000..f2244ca69c
--- /dev/null
+++ b/document/components/sidebarKeepOpen.tsx
@@ -0,0 +1,33 @@
+'use client';
+
+import { usePathname } from 'next/navigation';
+import { useRef } from 'react';
+import { useSidebar } from 'fumadocs-ui/provider';
+
+/**
+ * 移动端：点击一级 tab 切换时不关闭 sidebar，点击二级路由时正常关闭。
+ * 
+ * 在渲染阶段检测是否为 tab 间切换，是则设 closeOnRedirect = false。
+ */
+export function SidebarKeepOpen({ tabUrls }: { tabUrls: string[] }) {
+  const pathname = usePathname();
+  const prevPathname = useRef(pathname);
+  const { closeOnRedirect } = useSidebar();
+
+  if (prevPathname.current !== pathname) {
+    const prev = prevPathname.current;
+    prevPathname.current = pathname;
+
+    // 判断是否是 tab 间切换（从一个 tab 根路径跳到另一个 tab 根路径）
+    const prevTab = tabUrls.find((url) => prev.startsWith(url));
+    const currTab = tabUrls.find((url) => pathname.startsWith(url));
+
+    if (prevTab && currTab && prevTab !== currTab) {
+      // 一级 tab 切换 → 不关闭 sidebar
+      closeOnRedirect.current = false;
+    }
+    // 否则（二级路由跳转）→ 保持默认行为（关闭 sidebar）
+  }
+
+  return null;
+}
diff --git a/document/content/docs/introduction/cloud.mdx b/document/content/docs/introduction/cloud.mdx
index 0af6262152..bc8748239b 100644
--- a/document/content/docs/introduction/cloud.mdx
+++ b/document/content/docs/introduction/cloud.mdx
@@ -5,7 +5,7 @@ description: FastGPT 云服务
 
 ## 服务地址
 
-- [中国大陆: https://fastgpt.cn](https://fastgpt.cn)
+- [中国大陆版: https://fastgpt.cn](https://fastgpt.cn)
 - [国际版: https://fastgpt.io](https://fastgpt.io)
 
 请按需注册，两个版本账号不互通。
diff --git a/document/content/docs/introduction/index.mdx b/document/content/docs/introduction/index.mdx
index 20b1a58b88..723b42d30f 100644
--- a/document/content/docs/introduction/index.mdx
+++ b/document/content/docs/introduction/index.mdx
@@ -9,8 +9,8 @@ FastGPT 是一个基于 LLM 大语言模型的知识库问答系统，将智能
 
 <Alert icon="🤖" context="success">
 快速开始体验
-- 海外版：[https://fastgpt.io](https://fastgpt.io)
-- 国内版：[https://fastgpt.cn](https://fastgpt.cn)
+- 国际版：[https://fastgpt.io](https://fastgpt.io)
+- 中国大陆版：[https://fastgpt.cn](https://fastgpt.cn)
 </Alert>
 
 |                       |                                   |
diff --git a/document/content/docs/upgrading/4-11/4110.mdx b/document/content/docs/upgrading/4-11/4110.mdx
index f4222f5d72..ccb929297f 100644
--- a/document/content/docs/upgrading/4-11/4110.mdx
+++ b/document/content/docs/upgrading/4-11/4110.mdx
@@ -27,7 +27,7 @@ EVAL_LINE_LIMIT=1000 # 评估文件最大行数
 
 1. 移除所有**开源功能**的限制，包括：应用数量和知识库数量上限。
 2. 调整 RoadMap，增加`上下文管理`,`AI 生成工作流`,`高级编排 DeBug 调试模式`等计划。
-3. 海外版域名将`fastgpt.io`调整成`fastgpt.io`。
+3. 国际版域名将`fastgpt.io`调整成`fastgpt.io`。
 
 ## 🚀 新增内容
 
diff --git a/document/content/docs/use-cases/external-integration/official_account.mdx b/document/content/docs/use-cases/external-integration/official_account.mdx
index 679c887c8a..6eac7d4915 100644
--- a/document/content/docs/use-cases/external-integration/official_account.mdx
+++ b/document/content/docs/use-cases/external-integration/official_account.mdx
@@ -35,7 +35,7 @@ description: FastGPT 接入微信公众号教程
 
 私有部署的用户可自行查阅自己的 IP 地址。
 
-海外版用户（cloud.fastgpt.io）可以填写下面的 IP 白名单：
+国际版用户（cloud.fastgpt.io）可以填写下面的 IP 白名单：
 
 ```
 35.240.227.100
diff --git a/document/data/doc-last-modified.json b/document/data/doc-last-modified.json
index daaed430f1..b28521d205 100644
--- a/document/data/doc-last-modified.json
+++ b/document/data/doc-last-modified.json
@@ -7,7 +7,7 @@
   "document/content/docs/faq/index.mdx": "2025-08-02T19:38:37+08:00",
   "document/content/docs/faq/other.mdx": "2025-08-04T22:07:52+08:00",
   "document/content/docs/faq/points_consumption.mdx": "2025-08-02T19:38:37+08:00",
-  "document/content/docs/introduction/cloud.mdx": "2026-02-12T18:45:30+08:00",
+  "document/content/docs/introduction/cloud.mdx": "2026-02-26T00:22:01+08:00",
   "document/content/docs/introduction/commercial.mdx": "2025-09-21T23:09:46+08:00",
   "document/content/docs/introduction/development/configuration.mdx": "2025-08-05T23:20:39+08:00",
   "document/content/docs/introduction/development/custom-models/bge-rerank.mdx": "2025-07-23T21:35:03+08:00",
@@ -123,8 +123,8 @@
   "document/content/docs/upgrading/4-14/4145.mdx": "2026-01-18T23:59:15+08:00",
   "document/content/docs/upgrading/4-14/41451.mdx": "2026-01-20T11:53:27+08:00",
   "document/content/docs/upgrading/4-14/4146.mdx": "2026-02-12T16:37:50+08:00",
-  "document/content/docs/upgrading/4-14/4147.mdx": "2026-02-13T11:23:02+08:00",
-  "document/content/docs/upgrading/4-14/4148.mdx": "2026-02-24T13:48:31+08:00",
+  "document/content/docs/upgrading/4-14/4147.mdx": "2026-02-24T19:54:14+08:00",
+  "document/content/docs/upgrading/4-14/4148.mdx": "2026-02-25T18:28:16+08:00",
   "document/content/docs/upgrading/4-8/40.mdx": "2025-08-02T19:38:37+08:00",
   "document/content/docs/upgrading/4-8/41.mdx": "2025-08-02T19:38:37+08:00",
   "document/content/docs/upgrading/4-8/42.mdx": "2025-08-02T19:38:37+08:00",