diff --git a/README.md b/README.md
index 0685bd9..0012250 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,8 @@
 
 Twitter Lite is an intentional, read-only X reader. It shows content only after
 you enter a user handle, profile URL, search query, or list URL, follow a
-deliberate post detail link, or manually open a valid `/status/:tweetId` URL.
+deliberate post detail link, or manually open a valid
+`/:handle/status/:tweetId` URL.
 
 ## Scope
 
@@ -21,6 +22,15 @@ history, account directory, or write actions.
 Post detail pages show only the selected post and its visible conversation;
 they do not add related-post recommendations or an account-discovery surface.
 
+## Routes
+
+- `/` shows the empty user input.
+- `/:handle` shows a user timeline.
+- `/search?q=<query>&product=<Top|Latest>&following=<boolean>` shows search results.
+- `/i/lists` shows the authenticated account's lists.
+- `/i/lists/:listId` shows a list timeline.
+- `/:handle/status/:tweetId` shows one selected post and its visible conversation.
+
 ## Requirements and setup
 
 Use Nix, or Node.js `>=22.12.0` with pnpm `11.9.0`. The committed `.npmrc`
diff --git a/docs/superpowers/specs/2026-07-13-tweet-detail-thread-design.md b/docs/superpowers/specs/2026-07-13-tweet-detail-thread-design.md
index e5a645e..b8b355e 100644
--- a/docs/superpowers/specs/2026-07-13-tweet-detail-thread-design.md
+++ b/docs/superpowers/specs/2026-07-13-tweet-detail-thread-design.md
@@ -13,8 +13,9 @@ same intentional infinite-scroll behavior as the existing user and search
 feeds.
 
 This document originally extended `2026-07-13-twitter-lite-design.md` with the
-third route, `/status/:tweetId`, and the third narrowly scoped read-only server
-function, `loadThreadPosts`. The base design now incorporates both additions.
+post-detail route, now `/:handle/status/:tweetId`, and the narrowly scoped
+read-only server function, `loadThreadPosts`. The base design now incorporates
+both additions.
 
 ## Decisions
 
@@ -38,11 +39,13 @@ function, `loadThreadPosts`. The base design now incorporates both additions.
 Add the typed route:
 
 ```text
-/status/:tweetId
+/:handle/status/:tweetId
 ```
 
-`tweetId` is a non-empty decimal X post ID. Invalid IDs render a non-retryable
-input error and make no relay request.
+Generated links use the focal post author's normalized `handle`, and `tweetId`
+is a non-empty decimal X post ID. Both path parameters are validated, while the
+tweet lookup remains ID-based. Invalid parameters render a non-retryable input
+error and make no relay request.
 
 Every non-quoted post card gains an internal `詳細・スレッド` link in its
 footer. The existing external `元の投稿を開く` link remains available. The
@@ -50,9 +53,9 @@ whole card is not clickable because cards can contain text links and media
 controls. Quoted cards retain their current compact presentation.
 
 The status route uses the existing application shell. Neither `ユーザー` nor
-`検索` receives `aria-current` on this third route. The status page adds no
-third global navigation tab; it is reachable only from a deliberate post link
-or a manually entered URL.
+`検索` receives `aria-current` on the post-detail route. The status page adds
+no global navigation tab; it is reachable only from a deliberate post link or
+a manually entered URL.
 
 ## Bird and Relay Boundary
 
diff --git a/docs/superpowers/specs/2026-07-13-twitter-lite-design.md b/docs/superpowers/specs/2026-07-13-twitter-lite-design.md
index 80410c5..8bae653 100644
--- a/docs/superpowers/specs/2026-07-13-twitter-lite-design.md
+++ b/docs/superpowers/specs/2026-07-13-twitter-lite-design.md
@@ -11,15 +11,15 @@ Twitter Lite is a localhost-only reader for intentional access to X posts. It le
 - enter a handle or profile URL and read that user's posts;
 - search posts in popular or chronological order;
 - optionally restrict search to accounts followed by the authenticated relay profile;
-- follow a deliberate post link or manually enter a valid `/status/:tweetId` URL
+- follow a deliberate post link or manually enter a valid `/:handle/status/:tweetId` URL
   to read its visible conversation; and
 - continue through results with infinite scrolling.
 
-The product reduces ambient discovery rather than limiting how far a deliberate search may scroll. It shows content only after a submitted target or query, deliberate post-link navigation, or a manually entered valid `/status/:tweetId` URL.
+The product reduces ambient discovery rather than limiting how far a deliberate search may scroll. It shows content only after a submitted target or query, deliberate list navigation, deliberate post-link navigation, or a manually entered valid `/:handle/status/:tweetId` URL.
 
 ## Product Principles
 
-1. **Intent before content.** The initial screen is empty. Every result begins with a submitted target or query, deliberate post-link navigation, or a manually entered valid `/status/:tweetId` URL.
+1. **Intent before content.** The initial screen is empty. Every result begins with a submitted target or query, deliberate list navigation, deliberate post-link navigation, or a manually entered valid `/:handle/status/:tweetId` URL.
 2. **No ambient feed.** There is no home timeline, recommendation surface, trend list, notification screen, or recent-history list.
 3. **Reading only.** The app exposes no posting, reply, follow, like, repost, bookmark, or deletion operation.
 4. **No account directory.** Handles are unrestricted, but there is no autocomplete, suggested account list, or saved allowlist.
@@ -35,6 +35,7 @@ The product reduces ambient discovery rather than limiting how far a deliberate
 - raw X search syntax;
 - `Top` and `Latest` search products;
 - `filter:follows` search filtering;
+- authenticated account list selection and list timelines;
 - deliberate post detail pages with cursor-paginated visible conversations;
 - photos, videos, animated GIFs, quoted posts, article previews, and engagement counts when supplied by Bird;
 - infinite cursor pagination;
@@ -45,7 +46,7 @@ The product reduces ambient discovery rather than limiting how far a deliberate
 
 - authentication and multi-user accounts;
 - databases, cookies, saved preferences, viewing history, and analytics;
-- home, notifications, trends, lists, bookmarks, and likes;
+- home, notifications, trends, bookmarks, and likes;
 - all X mutation operations;
 - user autocomplete and typeahead;
 - People and Media search products;
@@ -105,14 +106,16 @@ TanStack Start supplies the browser/server boundary. Bird is imported only by se
 
 ### Routes and URL State
 
-- `/user?target=<handle-or-url>` displays the User tab.
+- `/` displays the empty User tab without fetching posts.
+- `/:handle` displays the User tab for the normalized handle.
 - `/search?q=<query>&product=<Top|Latest>&following=<boolean>` displays the Search tab.
-- `/status/:tweetId` displays one selected post and its visible conversation.
-- `/` redirects to `/user` without a target.
+- `/i/lists` displays the authenticated account's lists.
+- `/i/lists/:listId` displays one selected list timeline.
+- `/:handle/status/:tweetId` displays one selected post and its visible conversation.
 
-The target, query, product, and following flag are validated typed search parameters. Cursor state is internal to TanStack Query because it is transport state rather than a user-controlled view setting.
+The handle, list ID, and tweet ID are validated typed path parameters. The query, product, and following flag are validated typed search parameters. Cursor state is internal to TanStack Query because it is transport state rather than a user-controlled view setting.
 
-Route preloading never fetches posts. Data retrieval begins only when a valid submitted target or query is present or a valid `/status/:tweetId` route is reached through a deliberate post link or manually entered URL.
+Route preloading never fetches posts. Data retrieval begins only when a valid submitted handle or query is present, a list is deliberately selected, or a valid `/:handle/status/:tweetId` route is reached through a deliberate post link or manually entered URL.
 
 ### Server Boundary
 
@@ -206,7 +209,9 @@ The selected layout is **Focused Tabs**:
 
 The User tab contains one target input and a Display button. The Search tab contains a query input, a Popular/Latest segmented control, a Following only checkbox, and a Search button.
 
-Submitting updates the route's typed search parameters. Changing tabs does not preserve or surface the other tab's previous value.
+Submitting a user target normalizes it to a handle and navigates to `/:handle`.
+Submitting a search updates the route's typed search parameters. Changing tabs
+does not preserve or surface the other tab's previous value.
 
 ### Visual Direction
 
diff --git a/src/components/app-shell.tsx b/src/components/app-shell.tsx
index deefbf6..bac7abb 100644
--- a/src/components/app-shell.tsx
+++ b/src/components/app-shell.tsx
@@ -12,11 +12,7 @@ export function AppShell({
       <header className="app-header">
         <p className="brand">TWITTER LITE</p>
         <nav aria-label="閲覧方法" className="tabs">
-          <Link
-            aria-current={active === 'user' ? 'page' : undefined}
-            search={{ target: '' }}
-            to="/user"
-          >
+          <Link aria-current={active === 'user' ? 'page' : undefined} to="/">
             ユーザー
           </Link>
           <Link
@@ -28,8 +24,7 @@ export function AppShell({
           </Link>
           <Link
             aria-current={active === 'list' ? 'page' : undefined}
-            search={{ target: '' }}
-            to="/list"
+            to="/i/lists"
           >
             リスト
           </Link>
diff --git a/src/features/posts/components/list-picker.tsx b/src/features/posts/components/list-picker.tsx
index 6bfcc18..49e882d 100644
--- a/src/features/posts/components/list-picker.tsx
+++ b/src/features/posts/components/list-picker.tsx
@@ -46,8 +46,8 @@ export function ListPicker({ selectedId }: { selectedId?: string }) {
             <li key={list.id}>
               <Link
                 aria-current={selectedId === list.id ? 'page' : undefined}
-                search={{ target: list.id }}
-                to="/list"
+                params={{ listId: list.id }}
+                to="/i/lists/$listId"
               >
                 <span>{list.name}</span>
                 <small>
diff --git a/src/features/posts/components/post-card.test.tsx b/src/features/posts/components/post-card.test.tsx
index 111e07a..859acca 100644
--- a/src/features/posts/components/post-card.test.tsx
+++ b/src/features/posts/components/post-card.test.tsx
@@ -85,7 +85,7 @@ describe('PostCard', () => {
 
     expect(
       screen.getByRole('link', { name: '詳細・スレッド' }),
-    ).toHaveAttribute('href', '/status/123')
+    ).toHaveAttribute('href', '/yuta/status/123')
   })
 
   it('marks the focal post without linking to its current page', () => {
diff --git a/src/features/posts/components/post-card.tsx b/src/features/posts/components/post-card.tsx
index e64f038..cab7154 100644
--- a/src/features/posts/components/post-card.tsx
+++ b/src/features/posts/components/post-card.tsx
@@ -91,7 +91,9 @@ export function PostCard({
             {post.likeCount ?? 0}
           </span>
           {!current ? (
-            <a href={`/status/${encodeURIComponent(post.id)}`}>
+            <a
+              href={`/${encodeURIComponent(post.author.username)}/status/${encodeURIComponent(post.id)}`}
+            >
               詳細・スレッド
             </a>
           ) : null}
diff --git a/src/features/posts/inputs.test.ts b/src/features/posts/inputs.test.ts
index 0b59dc2..cf4a933 100644
--- a/src/features/posts/inputs.test.ts
+++ b/src/features/posts/inputs.test.ts
@@ -1,7 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import {
   buildSearchQuery,
-  listRouteSearchSchema,
   normalizeListTarget,
   normalizeTweetId,
   normalizeUserTarget,
@@ -91,14 +90,6 @@ describe('normalizeListTarget', () => {
   })
 })
 
-describe('listRouteSearchSchema', () => {
-  it('keeps a numeric list target from a hand-entered URL', () => {
-    expect(listRouteSearchSchema.parse({ target: 1234567890 })).toEqual({
-      target: '1234567890',
-    })
-  })
-})
-
 describe('buildSearchQuery', () => {
   it('keeps a deliberate query unchanged', () => {
     expect(buildSearchQuery('  AI lang:ja  ', false)).toBe('AI lang:ja')
diff --git a/src/features/posts/inputs.ts b/src/features/posts/inputs.ts
index f05a227..ed61959 100644
--- a/src/features/posts/inputs.ts
+++ b/src/features/posts/inputs.ts
@@ -43,15 +43,6 @@ export const searchPageInputSchema = z.object({
   cursor: z.string().min(1).optional(),
 })
 
-export const userRouteSearchSchema = z.object({
-  target: z.string().catch(''),
-})
-
-export const listRouteSearchSchema = z.object({
-  // List IDs are numeric, and the router JSON-parses numeric search values.
-  target: z.coerce.string().catch(''),
-})
-
 export const postSearchRouteSchema = z.object({
   q: z.string().catch(''),
   product: z.enum(['Top', 'Latest']).catch('Latest'),
diff --git a/src/routeTree.gen.ts b/src/routeTree.gen.ts
index 2339253..1351e09 100644
--- a/src/routeTree.gen.ts
+++ b/src/routeTree.gen.ts
@@ -9,25 +9,21 @@
 // Additionally, you should also exclude this file from your linter and/or formatter to prevent it from being checked or modified.
 
 import { Route as rootRouteImport } from './routes/__root'
-import { Route as UserRouteImport } from './routes/user'
 import { Route as SearchRouteImport } from './routes/search'
-import { Route as ListRouteImport } from './routes/list'
+import { Route as HandleRouteImport } from './routes/$handle'
 import { Route as IndexRouteImport } from './routes/index'
-import { Route as StatusTweetIdRouteImport } from './routes/status.$tweetId'
+import { Route as IListsRouteImport } from './routes/i.lists'
+import { Route as IListsListIdRouteImport } from './routes/i.lists_.$listId'
+import { Route as HandleStatusTweetIdRouteImport } from './routes/$handle_.status.$tweetId'
 
-const UserRoute = UserRouteImport.update({
-  id: '/user',
-  path: '/user',
-  getParentRoute: () => rootRouteImport,
-} as any)
 const SearchRoute = SearchRouteImport.update({
   id: '/search',
   path: '/search',
   getParentRoute: () => rootRouteImport,
 } as any)
-const ListRoute = ListRouteImport.update({
-  id: '/list',
-  path: '/list',
+const HandleRoute = HandleRouteImport.update({
+  id: '/$handle',
+  path: '/$handle',
   getParentRoute: () => rootRouteImport,
 } as any)
 const IndexRoute = IndexRouteImport.update({
@@ -35,59 +31,85 @@ const IndexRoute = IndexRouteImport.update({
   path: '/',
   getParentRoute: () => rootRouteImport,
 } as any)
-const StatusTweetIdRoute = StatusTweetIdRouteImport.update({
-  id: '/status/$tweetId',
-  path: '/status/$tweetId',
+const IListsRoute = IListsRouteImport.update({
+  id: '/i/lists',
+  path: '/i/lists',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const IListsListIdRoute = IListsListIdRouteImport.update({
+  id: '/i/lists_/$listId',
+  path: '/i/lists/$listId',
+  getParentRoute: () => rootRouteImport,
+} as any)
+const HandleStatusTweetIdRoute = HandleStatusTweetIdRouteImport.update({
+  id: '/$handle_/status/$tweetId',
+  path: '/$handle/status/$tweetId',
   getParentRoute: () => rootRouteImport,
 } as any)
 
 export interface FileRoutesByFullPath {
   '/': typeof IndexRoute
-  '/list': typeof ListRoute
+  '/$handle': typeof HandleRoute
   '/search': typeof SearchRoute
-  '/user': typeof UserRoute
-  '/status/$tweetId': typeof StatusTweetIdRoute
+  '/i/lists': typeof IListsRoute
+  '/$handle/status/$tweetId': typeof HandleStatusTweetIdRoute
+  '/i/lists/$listId': typeof IListsListIdRoute
 }
 export interface FileRoutesByTo {
   '/': typeof IndexRoute
-  '/list': typeof ListRoute
+  '/$handle': typeof HandleRoute
   '/search': typeof SearchRoute
-  '/user': typeof UserRoute
-  '/status/$tweetId': typeof StatusTweetIdRoute
+  '/i/lists': typeof IListsRoute
+  '/$handle/status/$tweetId': typeof HandleStatusTweetIdRoute
+  '/i/lists/$listId': typeof IListsListIdRoute
 }
 export interface FileRoutesById {
   __root__: typeof rootRouteImport
   '/': typeof IndexRoute
-  '/list': typeof ListRoute
+  '/$handle': typeof HandleRoute
   '/search': typeof SearchRoute
-  '/user': typeof UserRoute
-  '/status/$tweetId': typeof StatusTweetIdRoute
+  '/i/lists': typeof IListsRoute
+  '/$handle_/status/$tweetId': typeof HandleStatusTweetIdRoute
+  '/i/lists_/$listId': typeof IListsListIdRoute
 }
 export interface FileRouteTypes {
   fileRoutesByFullPath: FileRoutesByFullPath
-  fullPaths: '/' | '/list' | '/search' | '/user' | '/status/$tweetId'
+  fullPaths:
+    | '/'
+    | '/$handle'
+    | '/search'
+    | '/i/lists'
+    | '/$handle/status/$tweetId'
+    | '/i/lists/$listId'
   fileRoutesByTo: FileRoutesByTo
-  to: '/' | '/list' | '/search' | '/user' | '/status/$tweetId'
-  id: '__root__' | '/' | '/list' | '/search' | '/user' | '/status/$tweetId'
+  to:
+    | '/'
+    | '/$handle'
+    | '/search'
+    | '/i/lists'
+    | '/$handle/status/$tweetId'
+    | '/i/lists/$listId'
+  id:
+    | '__root__'
+    | '/'
+    | '/$handle'
+    | '/search'
+    | '/i/lists'
+    | '/$handle_/status/$tweetId'
+    | '/i/lists_/$listId'
   fileRoutesById: FileRoutesById
 }
 export interface RootRouteChildren {
   IndexRoute: typeof IndexRoute
-  ListRoute: typeof ListRoute
+  HandleRoute: typeof HandleRoute
   SearchRoute: typeof SearchRoute
-  UserRoute: typeof UserRoute
-  StatusTweetIdRoute: typeof StatusTweetIdRoute
+  IListsRoute: typeof IListsRoute
+  HandleStatusTweetIdRoute: typeof HandleStatusTweetIdRoute
+  IListsListIdRoute: typeof IListsListIdRoute
 }
 
 declare module '@tanstack/react-router' {
   interface FileRoutesByPath {
-    '/user': {
-      id: '/user'
-      path: '/user'
-      fullPath: '/user'
-      preLoaderRoute: typeof UserRouteImport
-      parentRoute: typeof rootRouteImport
-    }
     '/search': {
       id: '/search'
       path: '/search'
@@ -95,11 +117,11 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof SearchRouteImport
       parentRoute: typeof rootRouteImport
     }
-    '/list': {
-      id: '/list'
-      path: '/list'
-      fullPath: '/list'
-      preLoaderRoute: typeof ListRouteImport
+    '/$handle': {
+      id: '/$handle'
+      path: '/$handle'
+      fullPath: '/$handle'
+      preLoaderRoute: typeof HandleRouteImport
       parentRoute: typeof rootRouteImport
     }
     '/': {
@@ -109,11 +131,25 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof IndexRouteImport
       parentRoute: typeof rootRouteImport
     }
-    '/status/$tweetId': {
-      id: '/status/$tweetId'
-      path: '/status/$tweetId'
-      fullPath: '/status/$tweetId'
-      preLoaderRoute: typeof StatusTweetIdRouteImport
+    '/i/lists': {
+      id: '/i/lists'
+      path: '/i/lists'
+      fullPath: '/i/lists'
+      preLoaderRoute: typeof IListsRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/i/lists_/$listId': {
+      id: '/i/lists_/$listId'
+      path: '/i/lists/$listId'
+      fullPath: '/i/lists/$listId'
+      preLoaderRoute: typeof IListsListIdRouteImport
+      parentRoute: typeof rootRouteImport
+    }
+    '/$handle_/status/$tweetId': {
+      id: '/$handle_/status/$tweetId'
+      path: '/$handle/status/$tweetId'
+      fullPath: '/$handle/status/$tweetId'
+      preLoaderRoute: typeof HandleStatusTweetIdRouteImport
       parentRoute: typeof rootRouteImport
     }
   }
@@ -121,10 +157,11 @@ declare module '@tanstack/react-router' {
 
 const rootRouteChildren: RootRouteChildren = {
   IndexRoute: IndexRoute,
-  ListRoute: ListRoute,
+  HandleRoute: HandleRoute,
   SearchRoute: SearchRoute,
-  UserRoute: UserRoute,
-  StatusTweetIdRoute: StatusTweetIdRoute,
+  IListsRoute: IListsRoute,
+  HandleStatusTweetIdRoute: HandleStatusTweetIdRoute,
+  IListsListIdRoute: IListsListIdRoute,
 }
 export const routeTree = rootRouteImport
   ._addFileChildren(rootRouteChildren)
diff --git a/src/routes/$handle.tsx b/src/routes/$handle.tsx
new file mode 100644
index 0000000..4c1ccea
--- /dev/null
+++ b/src/routes/$handle.tsx
@@ -0,0 +1,11 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { UserPage } from './index'
+
+export const Route = createFileRoute('/$handle')({
+  component: UserRoute,
+})
+
+function UserRoute() {
+  const { handle } = Route.useParams()
+  return <UserPage handle={handle} />
+}
diff --git a/src/routes/status.$tweetId.tsx b/src/routes/$handle_.status.$tweetId.tsx
similarity index 66%
rename from src/routes/status.$tweetId.tsx
rename to src/routes/$handle_.status.$tweetId.tsx
index 7c3c0a2..e468278 100644
--- a/src/routes/status.$tweetId.tsx
+++ b/src/routes/$handle_.status.$tweetId.tsx
@@ -1,24 +1,27 @@
 import { createFileRoute } from '@tanstack/react-router'
 import { AppShell } from '#/components/app-shell'
 import { PostFeed } from '#/features/posts/components/post-feed'
-import { InputError, normalizeTweetId } from '#/features/posts/inputs'
+import {
+  InputError,
+  normalizeTweetId,
+  normalizeUserTarget,
+} from '#/features/posts/inputs'
 
-export const Route = createFileRoute('/status/$tweetId')({
+export const Route = createFileRoute('/$handle_/status/$tweetId')({
   component: StatusRoute,
 })
 
 function StatusRoute() {
-  const { tweetId: rawTweetId } = Route.useParams()
+  const { handle: rawHandle, tweetId: rawTweetId } = Route.useParams()
   let tweetId: string | undefined
   let error: string | undefined
 
   try {
+    normalizeUserTarget(rawHandle)
     tweetId = normalizeTweetId(rawTweetId)
   } catch (cause) {
     error =
-      cause instanceof InputError
-        ? cause.message
-        : '投稿 ID を確認してください。'
+      cause instanceof InputError ? cause.message : 'URL を確認してください。'
   }
 
   return (
diff --git a/src/routes/-feed-wiring.test.tsx b/src/routes/-feed-wiring.test.tsx
index 72931e8..50274f9 100644
--- a/src/routes/-feed-wiring.test.tsx
+++ b/src/routes/-feed-wiring.test.tsx
@@ -72,7 +72,7 @@ describe('post feed route wiring', () => {
   afterEach(() => vi.unstubAllGlobals())
 
   it('keeps an empty user URL disabled', async () => {
-    await renderRoute('/user?target=')
+    await renderRoute('/')
 
     expect(
       await screen.findByRole('heading', { name: '誰の投稿を見ますか？' }),
@@ -81,7 +81,7 @@ describe('post feed route wiring', () => {
   })
 
   it('turns a manually entered user URL into a deliberate request', async () => {
-    await renderRoute('/user?target=yuta')
+    await renderRoute('/yuta')
 
     await waitFor(() =>
       expect(usePostFeed).toHaveBeenCalledWith({
@@ -91,8 +91,17 @@ describe('post feed route wiring', () => {
     )
   })
 
+  it('keeps an invalid user path local and idle', async () => {
+    await renderRoute('/not-a-handle')
+
+    expect(await screen.findByRole('alert')).toHaveTextContent(
+      'ハンドルは英数字とアンダースコアで入力してください。',
+    )
+    expect(usePostFeed).toHaveBeenCalledWith(undefined)
+  })
+
   it('keeps an empty list URL disabled', async () => {
-    await renderRoute('/list?target=')
+    await renderRoute('/i/lists')
 
     expect(
       await screen.findByRole('heading', { name: 'どのリストを読みますか？' }),
@@ -101,7 +110,7 @@ describe('post feed route wiring', () => {
   })
 
   it('turns a manually entered list URL into a deliberate request', async () => {
-    await renderRoute('/list?target=1234567890')
+    await renderRoute('/i/lists/1234567890')
 
     await waitFor(() =>
       expect(usePostFeed).toHaveBeenCalledWith({
@@ -114,8 +123,17 @@ describe('post feed route wiring', () => {
     ).toBeVisible()
   })
 
+  it('keeps an invalid list path local and idle', async () => {
+    await renderRoute('/i/lists/not-a-list')
+
+    expect(await screen.findByRole('alert')).toHaveTextContent(
+      'リスト ID は数字で入力してください。',
+    )
+    expect(usePostFeed).toHaveBeenCalledWith(undefined)
+  })
+
   it('turns a selected authenticated list into a deliberate request', async () => {
-    await renderRoute('/list?target=')
+    await renderRoute('/i/lists')
 
     fireEvent.click(
       await screen.findByRole('link', { name: /My List.*10 メンバー/ }),
@@ -143,7 +161,7 @@ describe('post feed route wiring', () => {
   })
 
   it('turns a decimal status path into a deliberate thread request', async () => {
-    await renderRoute('/status/123')
+    await renderRoute('/yuta/status/123')
 
     expect(await screen.findByRole('heading', { name: '会話' })).toBeVisible()
     await waitFor(() =>
@@ -160,12 +178,21 @@ describe('post feed route wiring', () => {
     ).toBeNull()
   })
 
-  it('keeps an invalid status path local and idle', async () => {
-    await renderRoute('/status/not-a-tweet')
+  it('keeps an invalid tweet path local and idle', async () => {
+    await renderRoute('/yuta/status/not-a-tweet')
 
     expect(await screen.findByRole('alert')).toHaveTextContent(
       '投稿 ID を確認してください。',
     )
     expect(usePostFeed).toHaveBeenCalledWith(undefined)
   })
+
+  it('keeps an invalid status handle local and idle', async () => {
+    await renderRoute('/not-a-handle/status/123')
+
+    expect(await screen.findByRole('alert')).toHaveTextContent(
+      'ハンドルは英数字とアンダースコアで入力してください。',
+    )
+    expect(usePostFeed).toHaveBeenCalledWith(undefined)
+  })
 })
diff --git a/src/routes/i.lists.tsx b/src/routes/i.lists.tsx
new file mode 100644
index 0000000..13fe2bd
--- /dev/null
+++ b/src/routes/i.lists.tsx
@@ -0,0 +1,63 @@
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
+import { AppShell } from '#/components/app-shell'
+import { ListForm } from '#/features/posts/components/list-form'
+import { ListPicker } from '#/features/posts/components/list-picker'
+import { PostFeed } from '#/features/posts/components/post-feed'
+import { InputError, normalizeListTarget } from '#/features/posts/inputs'
+
+export const Route = createFileRoute('/i/lists')({
+  component: ListIndexRoute,
+})
+
+function ListIndexRoute() {
+  return <ListPage />
+}
+
+export function ListPage({ listId = '' }: { listId?: string }) {
+  const navigate = useNavigate()
+  let normalizedListId: string | undefined
+  let error: string | undefined
+
+  if (listId) {
+    try {
+      normalizedListId = normalizeListTarget(listId)
+    } catch (cause) {
+      error =
+        cause instanceof InputError
+          ? cause.message
+          : 'リスト ID を確認してください。'
+    }
+  }
+
+  return (
+    <AppShell active="list">
+      <h1>どのリストを読みますか？</h1>
+      <p className="intro">
+        自分のリストを選ぶか、リストURLを入力してください。
+      </p>
+      <ListPicker selectedId={listId || undefined} />
+      <ListForm
+        initialTarget={listId}
+        key={listId}
+        onSubmit={(nextListId) =>
+          navigate({
+            to: '/i/lists/$listId',
+            params: { listId: nextListId },
+          })
+        }
+      />
+      {error ? (
+        <p className="state" role="alert">
+          {error}
+        </p>
+      ) : null}
+      <PostFeed
+        request={
+          normalizedListId
+            ? { kind: 'list', target: normalizedListId }
+            : undefined
+        }
+      />
+    </AppShell>
+  )
+}
diff --git a/src/routes/i.lists_.$listId.tsx b/src/routes/i.lists_.$listId.tsx
new file mode 100644
index 0000000..0f61b99
--- /dev/null
+++ b/src/routes/i.lists_.$listId.tsx
@@ -0,0 +1,11 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { ListPage } from './i.lists'
+
+export const Route = createFileRoute('/i/lists_/$listId')({
+  component: ListRoute,
+})
+
+function ListRoute() {
+  const { listId } = Route.useParams()
+  return <ListPage listId={listId} />
+}
diff --git a/src/routes/index.tsx b/src/routes/index.tsx
index ca7971e..192e9a8 100644
--- a/src/routes/index.tsx
+++ b/src/routes/index.tsx
@@ -1,7 +1,56 @@
-import { createFileRoute, redirect } from '@tanstack/react-router'
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
+import { AppShell } from '#/components/app-shell'
+import { PostFeed } from '#/features/posts/components/post-feed'
+import { UserForm } from '#/features/posts/components/user-form'
+import { InputError, normalizeUserTarget } from '#/features/posts/inputs'
 
 export const Route = createFileRoute('/')({
-  beforeLoad: () => {
-    throw redirect({ to: '/user', search: { target: '' } })
-  },
+  component: UserIndexRoute,
 })
+
+function UserIndexRoute() {
+  return <UserPage />
+}
+
+export function UserPage({ handle = '' }: { handle?: string }) {
+  const navigate = useNavigate()
+  let normalizedHandle: string | undefined
+  let error: string | undefined
+
+  if (handle) {
+    try {
+      normalizedHandle = normalizeUserTarget(handle)
+    } catch (cause) {
+      error =
+        cause instanceof InputError
+          ? cause.message
+          : 'ハンドルを確認してください。'
+    }
+  }
+
+  return (
+    <AppShell active="user">
+      <h1>誰の投稿を見ますか？</h1>
+      <p className="intro">履歴やおすすめは表示しません。</p>
+      <UserForm
+        initialTarget={handle}
+        key={handle}
+        onSubmit={(nextHandle) =>
+          navigate({ to: '/$handle', params: { handle: nextHandle } })
+        }
+      />
+      {error ? (
+        <p className="state" role="alert">
+          {error}
+        </p>
+      ) : null}
+      <PostFeed
+        request={
+          normalizedHandle
+            ? { kind: 'user', target: normalizedHandle }
+            : undefined
+        }
+      />
+    </AppShell>
+  )
+}
diff --git a/src/routes/list.tsx b/src/routes/list.tsx
deleted file mode 100644
index d5c3ced..0000000
--- a/src/routes/list.tsx
+++ /dev/null
@@ -1,31 +0,0 @@
-import { createFileRoute } from '@tanstack/react-router'
-import { AppShell } from '#/components/app-shell'
-import { ListForm } from '#/features/posts/components/list-form'
-import { ListPicker } from '#/features/posts/components/list-picker'
-import { PostFeed } from '#/features/posts/components/post-feed'
-import { listRouteSearchSchema } from '#/features/posts/inputs'
-
-export const Route = createFileRoute('/list')({
-  validateSearch: (search) => listRouteSearchSchema.parse(search),
-  component: ListRoute,
-})
-
-function ListRoute() {
-  const { target } = Route.useSearch()
-  const navigate = Route.useNavigate()
-  return (
-    <AppShell active="list">
-      <h1>どのリストを読みますか？</h1>
-      <p className="intro">
-        自分のリストを選ぶか、リストURLを入力してください。
-      </p>
-      <ListPicker selectedId={target || undefined} />
-      <ListForm
-        initialTarget={target}
-        key={target}
-        onSubmit={(nextTarget) => navigate({ search: { target: nextTarget } })}
-      />
-      <PostFeed request={target ? { kind: 'list', target } : undefined} />
-    </AppShell>
-  )
-}
diff --git a/src/routes/user.tsx b/src/routes/user.tsx
deleted file mode 100644
index d3656c2..0000000
--- a/src/routes/user.tsx
+++ /dev/null
@@ -1,27 +0,0 @@
-import { createFileRoute } from '@tanstack/react-router'
-import { AppShell } from '#/components/app-shell'
-import { PostFeed } from '#/features/posts/components/post-feed'
-import { UserForm } from '#/features/posts/components/user-form'
-import { userRouteSearchSchema } from '#/features/posts/inputs'
-
-export const Route = createFileRoute('/user')({
-  validateSearch: (search) => userRouteSearchSchema.parse(search),
-  component: UserRoute,
-})
-
-function UserRoute() {
-  const { target } = Route.useSearch()
-  const navigate = Route.useNavigate()
-  return (
-    <AppShell active="user">
-      <h1>誰の投稿を見ますか？</h1>
-      <p className="intro">履歴やおすすめは表示しません。</p>
-      <UserForm
-        initialTarget={target}
-        key={target}
-        onSubmit={(nextTarget) => navigate({ search: { target: nextTarget } })}
-      />
-      <PostFeed request={target ? { kind: 'user', target } : undefined} />
-    </AppShell>
-  )
-}
diff --git a/tests/e2e/reader.spec.ts b/tests/e2e/reader.spec.ts
index f0e6b7c..38b3cd3 100644
--- a/tests/e2e/reader.spec.ts
+++ b/tests/e2e/reader.spec.ts
@@ -44,7 +44,7 @@ test('requires intent and infinitely loads a user timeline', async ({
   page,
 }) => {
   await openReader(page, '/')
-  await expect(page).toHaveURL(/\/user\?target=$/)
+  await expect(page).toHaveURL(/\/$/)
   await expect(page.locator('article')).toHaveCount(0)
   await expect(page.getByRole('link', { name: ambientLinkNames })).toHaveCount(
     0,
@@ -53,6 +53,7 @@ test('requires intent and infinitely loads a user timeline', async ({
   await page.getByLabel('ハンドルまたはプロフィール URL').fill('@yuta')
   await page.getByRole('button', { name: '表示' }).click()
 
+  await expect(page).toHaveURL(/\/yuta$/)
   await expect(page.getByText('user page 1')).toBeVisible()
   await expect(page.getByText('user page 2')).toBeVisible()
   await expect(page.getByText('これ以上の投稿はありません。')).toBeVisible()
@@ -65,12 +66,12 @@ test('requires intent and infinitely loads a user timeline', async ({
 test('selects an authenticated list and infinitely loads its timeline', async ({
   page,
 }) => {
-  await openReader(page, '/list?target=')
+  await openReader(page, '/i/lists')
   await expect(page.locator('article')).toHaveCount(0)
 
   await page.getByRole('link', { name: /My E2E List.*10 メンバー/ }).click()
 
-  await expect(page).toHaveURL(/\/list\?target=(?:%22)?1234567890/)
+  await expect(page).toHaveURL(/\/i\/lists\/1234567890$/)
   await expect(page.getByText('list page 1')).toBeVisible()
   await expect(page.getByText('list page 2')).toBeVisible()
   await expect(page.getByText('これ以上の投稿はありません。')).toBeVisible()
@@ -79,13 +80,13 @@ test('selects an authenticated list and infinitely loads its timeline', async ({
 test('opens a card detail and infinitely loads its conversation', async ({
   page,
 }) => {
-  await openReader(page, '/user?target=yuta')
+  await openReader(page, '/yuta')
   const sourceCard = page
     .getByRole('article')
     .filter({ hasText: 'user page 1' })
   await sourceCard.getByRole('link', { name: '詳細・スレッド' }).click()
 
-  await expect(page).toHaveURL(/\/status\/1001$/)
+  await expect(page).toHaveURL(/\/yuta\/status\/1001$/)
   await expect(page.getByRole('heading', { name: '会話' })).toBeVisible()
   await expect(page.getByText('表示中の投稿')).toBeVisible()
   await expect(page.getByText('user page 1')).toHaveCount(1)
@@ -102,7 +103,7 @@ test('opens a card detail and infinitely loads its conversation', async ({
 test('resolves a reply root and retries only the failed continuation', async ({
   page,
 }) => {
-  await openReader(page, '/status/2001')
+  await openReader(page, '/yuta/status/2001')
 
   await expect(page.getByText('retry focal')).toHaveCount(1)
   await expect(page.getByText('thread root')).toBeVisible()