diff --git a/src/renderer/src/app/Onboarding.tsx b/src/renderer/src/app/Onboarding.tsx
index 048fae7a..2cce20aa 100644
--- a/src/renderer/src/app/Onboarding.tsx
+++ b/src/renderer/src/app/Onboarding.tsx
@@ -181,7 +181,7 @@ export function Onboarding({
           </p>
           <div className="onboarding-steps">
             {STEPS.map((entry) => (
-              <span key={entry.id} className={`step-chip ${entry.id === step ? "active" : ""}`}>{entry.label}</span>
+              <span key={entry.id} aria-current={entry.id === step ? "step" : undefined} className={`step-chip ${entry.id === step ? "active" : ""}`}>{entry.label}</span>
             ))}
           </div>
         </div>
@@ -277,6 +277,7 @@ function WelcomeStep({
       <div className="row">
         <h2 className="page-h1" style={{ margin: 0, flex: 1 }}>{t("Welcome")}</h2>
         <Segmented
+          label={t("Language")}
           value={language}
           onChange={(next) => { if (next !== language) onLanguage(next); }}
           options={[{ id: "en", label: "English" }, { id: "zh", label: "中文" }]}
@@ -386,7 +387,7 @@ function ModeCard({
   onClick: () => void;
 }) {
   return (
-    <button type="button" className={`option-card ${active ? "active" : ""}`.trim()} onClick={onClick}>
+    <button type="button" aria-pressed={active} className={`option-card ${active ? "active" : ""}`.trim()} onClick={onClick}>
       <div className="opt-title">{title}</div>
       <div className="opt-sub">{description}</div>
     </button>
diff --git a/src/renderer/src/app/OnboardingProviderStep.tsx b/src/renderer/src/app/OnboardingProviderStep.tsx
index 704f4faa..aeb17652 100644
--- a/src/renderer/src/app/OnboardingProviderStep.tsx
+++ b/src/renderer/src/app/OnboardingProviderStep.tsx
@@ -33,6 +33,7 @@ export function ProviderStep({
           <Fragment key={provider.key}>
             <button
               type="button"
+              aria-pressed={draft.providerKey === provider.key}
               className={`option-card ${draft.providerKey === provider.key ? "active" : ""}`.trim()}
               onClick={() => onChange({
                 providerKey: provider.key,
diff --git a/src/renderer/src/i18n/zh.ts b/src/renderer/src/i18n/zh.ts
index 67660f1c..df9ddbca 100644
--- a/src/renderer/src/i18n/zh.ts
+++ b/src/renderer/src/i18n/zh.ts
@@ -698,6 +698,10 @@ export const zh: Record<string, string> = {
   "Working…": "处理中…",
   "Waiting for the {name} sign-in in your browser (check {check} of {checks}).": "正在等待你在浏览器中完成 {name} 登录（第 {check}/{checks} 次检查）。",
   "Stop waiting": "停止等待",
+  "Layout": "布局",
+  "View": "视图",
+  "Run status": "运行状态",
+  "Task sections": "任务分区",
   "Copy": "复制",
   "Copied": "已复制",
   "Copy failed": "复制失败",
diff --git a/src/renderer/src/pages/FilesPage.tsx b/src/renderer/src/pages/FilesPage.tsx
index 3f710a5c..d1aa8785 100644
--- a/src/renderer/src/pages/FilesPage.tsx
+++ b/src/renderer/src/pages/FilesPage.tsx
@@ -81,6 +81,7 @@ export function FilesPage({ snapshot, actions, focus }: PageProps) {
         <TopbarActions>
           <FilesFilter scan={scanFilter} onScan={setScanFilter} />
           <Segmented<ViewMode>
+            label={t("Layout")}
             value={view}
             onChange={setView}
             options={[
diff --git a/src/renderer/src/pages/RunsPage.tsx b/src/renderer/src/pages/RunsPage.tsx
index 79149dca..2a9a64ed 100644
--- a/src/renderer/src/pages/RunsPage.tsx
+++ b/src/renderer/src/pages/RunsPage.tsx
@@ -101,7 +101,7 @@ export function RunsPage({ snapshot, actions, navigate, focus }: PageProps) {
             onChange={(e) => setSearch(e.target.value)}
             style={{ marginBottom: 8 }}
           />
-          <Segmented value={filter} onChange={setFilter} options={FILTERS} />
+          <Segmented label={t("Run status")} value={filter} onChange={setFilter} options={FILTERS} />
         </div>
         <div className="pane-scroll">
           {/* Newest first, so "show older runs" continues below. */}
@@ -113,6 +113,7 @@ export function RunsPage({ snapshot, actions, navigate, focus }: PageProps) {
               <button
                 key={run.id}
                 type="button"
+                aria-current={active ? "true" : undefined}
                 className={`nav-row ${active ? "active" : ""}`}
                 onClick={() => setSelectedId(run.id)}
               >
diff --git a/src/renderer/src/pages/SettingsPage.tsx b/src/renderer/src/pages/SettingsPage.tsx
index ef475502..fa11a3dd 100644
--- a/src/renderer/src/pages/SettingsPage.tsx
+++ b/src/renderer/src/pages/SettingsPage.tsx
@@ -105,6 +105,7 @@ function NavGroup({
           key={item.id}
           type="button"
           aria-label={item.label}
+          aria-current={item.id === active ? "page" : undefined}
           className={`nav-item ${item.id === active ? "active" : ""}`.trim()}
           onClick={() => onChange(item.id)}
         >
diff --git a/src/renderer/src/pages/WorkPage.tsx b/src/renderer/src/pages/WorkPage.tsx
index f45fae2d..a6671f40 100644
--- a/src/renderer/src/pages/WorkPage.tsx
+++ b/src/renderer/src/pages/WorkPage.tsx
@@ -100,7 +100,7 @@ export function WorkPage({ snapshot, actions, navigate, focus }: PageProps) {
   return (
     <div className="page-wide work-page">
       <TopbarActions>
-        <Segmented value={view} onChange={setView} options={VIEW_OPTIONS} />
+        <Segmented label={t("View")} value={view} onChange={setView} options={VIEW_OPTIONS} />
         <WorkFilter
           agents={agents}
           priority={priorityFilter}
diff --git a/src/renderer/src/pages/chat/ChatSidebar.tsx b/src/renderer/src/pages/chat/ChatSidebar.tsx
index 6d0b3641..3a3e6fc1 100644
--- a/src/renderer/src/pages/chat/ChatSidebar.tsx
+++ b/src/renderer/src/pages/chat/ChatSidebar.tsx
@@ -117,6 +117,7 @@ function ConversationRow({
   return (
     <button
       type="button"
+      aria-current={active ? "true" : undefined}
       className={`convo-item ${active ? "active" : ""}`.trim()}
       onClick={onClick}
     >
diff --git a/src/renderer/src/pages/files/FilesTree.tsx b/src/renderer/src/pages/files/FilesTree.tsx
index 6418326f..050ee20a 100644
--- a/src/renderer/src/pages/files/FilesTree.tsx
+++ b/src/renderer/src/pages/files/FilesTree.tsx
@@ -91,7 +91,7 @@ function TreeItem({
   onClick: () => void;
 }) {
   return (
-    <button type="button" className={`nav-item ${active ? "active" : ""}`.trim()} onClick={onClick}>
+    <button type="button" aria-current={active ? "true" : undefined} className={`nav-item ${active ? "active" : ""}`.trim()} onClick={onClick}>
       <span className="icon-box"><Icon name={icon} size={18} /></span>
       <span>{label}</span>
       <span className="nav-badge num">{count}</span>
diff --git a/src/renderer/src/pages/settings/ProviderRequestPanel.tsx b/src/renderer/src/pages/settings/ProviderRequestPanel.tsx
index 5d3f2476..91639801 100644
--- a/src/renderer/src/pages/settings/ProviderRequestPanel.tsx
+++ b/src/renderer/src/pages/settings/ProviderRequestPanel.tsx
@@ -99,6 +99,7 @@ export function ProviderRequestPanel({
             <span>{t("Mode")}</span>
             <div style={{ alignSelf: "flex-start" }}>
               <Segmented
+                label={t("Mode")}
                 value={selectedMode}
                 onChange={setMode}
                 options={backgroundAwareOptions(canRunBackground)}
diff --git a/src/renderer/src/pages/work/TaskDetailDialog.tsx b/src/renderer/src/pages/work/TaskDetailDialog.tsx
index 879f8301..ed64a60d 100644
--- a/src/renderer/src/pages/work/TaskDetailDialog.tsx
+++ b/src/renderer/src/pages/work/TaskDetailDialog.tsx
@@ -159,7 +159,7 @@ export function TaskDetailDialog({
           {task.requiresFilesystem && <Pill>{t("workspace")}</Pill>}
         </div>
 
-        <div style={{ marginBottom: 12 }}><Segmented value={tab} onChange={setTab} options={TABS} /></div>
+        <div style={{ marginBottom: 12 }}><Segmented label={t("Task sections")} value={tab} onChange={setTab} options={TABS} /></div>
 
         {tab === "overview" && (
           <OverviewTab
diff --git a/src/renderer/src/shared/OrgSwitcher.tsx b/src/renderer/src/shared/OrgSwitcher.tsx
index 50841867..efcef9b3 100644
--- a/src/renderer/src/shared/OrgSwitcher.tsx
+++ b/src/renderer/src/shared/OrgSwitcher.tsx
@@ -94,6 +94,7 @@ export function OrgSwitcher({ snapshot, activeOrgId, onSelect, onNew, onDelete }
               <button
                 type="button"
                 role="menuitem"
+                aria-current={org.id === activeOrgId ? "true" : undefined}
                 className={`org-menu-row ${org.id === activeOrgId ? "active" : ""}`.trim()}
                 onClick={() => handleSelect(org.id)}
               >
diff --git a/src/renderer/src/shared/Popover.tsx b/src/renderer/src/shared/Popover.tsx
index 27dba521..3dd52b13 100644
--- a/src/renderer/src/shared/Popover.tsx
+++ b/src/renderer/src/shared/Popover.tsx
@@ -61,6 +61,7 @@ export function MenuRow({
     <button
       type="button"
       role="menuitem"
+      aria-current={active ? "true" : undefined}
       className={`menu-row ${active ? "active" : ""} ${danger ? "danger" : ""}`.replace(/\s+/g, " ").trim()}
       onClick={onClick}
     >
diff --git a/src/renderer/src/shared/ui.tsx b/src/renderer/src/shared/ui.tsx
index 6efd4831..626c5a1b 100644
--- a/src/renderer/src/shared/ui.tsx
+++ b/src/renderer/src/shared/ui.tsx
@@ -1,4 +1,4 @@
-import { createContext, useContext, type ReactNode } from "react";
+import { createContext, useContext, type ReactNode, type KeyboardEvent } from "react";
 import { Icon, type IconName } from "./Icon";
 
 export interface AvatarLook {
@@ -181,21 +181,37 @@ export function Field({ label, children }: { label: string; children: ReactNode
   );
 }
 
+/** A one-of choice: a labelled radio group, the chosen option checked and the only one in the Tab order; arrows, Home and End move the choice. */
 export function Segmented<T extends string>({
+  label,
   value,
   onChange,
   options,
 }: {
+  label: string;
   value: T;
   onChange: (next: T) => void;
   options: ReadonlyArray<{ id: T; label: string }>;
 }) {
+  const move = (event: KeyboardEvent<HTMLDivElement>) => {
+    const index = options.findIndex((option) => option.id === value);
+    const next = event.key === "ArrowRight" || event.key === "ArrowDown" ? (index + 1) % options.length
+      : event.key === "ArrowLeft" || event.key === "ArrowUp" ? (index - 1 + options.length) % options.length
+        : event.key === "Home" ? 0 : event.key === "End" ? options.length - 1 : null;
+    if (next === null) return;
+    event.preventDefault();
+    onChange(options[next]!.id);
+    event.currentTarget.querySelectorAll<HTMLButtonElement>("[role=radio]")[next]?.focus();
+  };
   return (
-    <div className="segmented">
+    <div className="segmented" role="radiogroup" aria-label={label} onKeyDown={move}>
       {options.map((option) => (
         <button
           key={option.id}
           type="button"
+          role="radio"
+          aria-checked={value === option.id}
+          tabIndex={value === option.id ? 0 : -1}
           className={`segment ${value === option.id ? "active" : ""}`.trim()}
           onClick={() => onChange(option.id)}
         >
diff --git a/tests/e2e/ceo-chat.spec.ts b/tests/e2e/ceo-chat.spec.ts
index c423a62b..dead5f5e 100644
--- a/tests/e2e/ceo-chat.spec.ts
+++ b/tests/e2e/ceo-chat.spec.ts
@@ -404,7 +404,7 @@ test("the pinned CEO conversation is the Messages front door", async () => {
     await parentDialog.getByRole("button", { name: "Delete", exact: true }).click();
     await expect(parentDialog.getByRole("alertdialog", { name: "Delete this task?" })).toContainText("1 subtasks stay and move to the top level.");
     // Switching to another task drops a pending confirmation, so it can never delete the wrong task.
-    await parentDialog.getByRole("button", { name: "Subtasks" }).click();
+    await parentDialog.getByRole("radio", { name: "Subtasks" }).click();
     await parentDialog.getByRole("button", { name: "Open task Child step" }).click();
     const childDialog = page.getByRole("dialog", { name: "Child step" });
     await expect(childDialog).toBeVisible();
diff --git a/tests/e2e/desktop.spec.ts b/tests/e2e/desktop.spec.ts
index 35610133..3faaef85 100644
--- a/tests/e2e/desktop.spec.ts
+++ b/tests/e2e/desktop.spec.ts
@@ -244,7 +244,7 @@ test("onboards, hires, and creates work in the Electron shell", async () => {
     await page.getByRole("button", { name: "Advanced" }).click();
     await expect(page.getByText("Requests", { exact: true }).first()).toBeVisible();
     await expect(page.getByLabel("Request provider")).toBeVisible();
-    await expect(page.getByRole("button", { name: "Background" })).toBeVisible();
+    await expect(page.getByRole("radio", { name: "Background" })).toBeVisible();
     await page.getByLabel("Request prompt").fill("Draft a provider control memo.");
     await page.getByLabel("Request instructions").fill("Use direct language.");
 
diff --git a/tests/e2e/keyboard.spec.ts b/tests/e2e/keyboard.spec.ts
index d21afc7f..c0f33088 100644
--- a/tests/e2e/keyboard.spec.ts
+++ b/tests/e2e/keyboard.spec.ts
@@ -55,6 +55,17 @@ test("a dialog keeps the keyboard inside it, closes on Escape, and gives focus b
     await expect(dialog).toHaveCount(0);
     // Both layers closed at once; focus still returns to what opened the dialog.
     await expect(opener).toBeFocused();
+
+    // A one-of choice says which option is chosen, and the arrow keys move the choice.
+    const views = page.getByRole("radiogroup", { name: "View" });
+    await expect(views.getByRole("radio", { name: "Board" })).toHaveAttribute("aria-checked", "true");
+    await views.getByRole("radio", { name: "Board" }).focus();
+    await page.keyboard.press("ArrowRight");
+    await expect(views.getByRole("radio", { name: "List" })).toHaveAttribute("aria-checked", "true");
+    await expect(views.getByRole("radio", { name: "List" })).toBeFocused();
+    await expect(views.getByRole("radio", { name: "Board" })).toHaveAttribute("aria-checked", "false");
+    await page.keyboard.press("Home");
+    await expect(views.getByRole("radio", { name: "Board" })).toHaveAttribute("aria-checked", "true");
   } finally {
     await closeApp(app);
   }
diff --git a/tests/e2e/onboarding-resume.spec.ts b/tests/e2e/onboarding-resume.spec.ts
index 0d323a47..826a27cd 100644
--- a/tests/e2e/onboarding-resume.spec.ts
+++ b/tests/e2e/onboarding-resume.spec.ts
@@ -75,8 +75,8 @@ test("onboarding resumes where it was left after the app is closed", async () =>
   await expect.poll(savedModel).toBe("cancelled-model");
   // Saving a preference refreshes the in-memory snapshot, which now holds the draft too.
   await page.getByRole("button", { name: "Back", exact: true }).click();
-  await page.getByRole("button", { name: "中文" }).click();
-  await page.getByRole("button", { name: "English" }).click();
+  await page.getByRole("radio", { name: "中文" }).click();
+  await page.getByRole("radio", { name: "English" }).click();
   // Past the 800 ms change-event reload window, so only Cancel itself can refresh the snapshot.
   await page.waitForTimeout(1_200);
   await page.getByRole("button", { name: "Cancel" }).click();