diff --git a/src/components/clinical-dashboard/differentials-home.tsx b/src/components/clinical-dashboard/differentials-home.tsx
index 3b888af2a..8c1a6e43d 100644
--- a/src/components/clinical-dashboard/differentials-home.tsx
+++ b/src/components/clinical-dashboard/differentials-home.tsx
@@ -276,10 +276,13 @@ function ResultTypeTabs({
     { id: "diagnosis" as const, label: "Diagnoses", count: diagnosisCount },
   ];
 
+  // Single-select filters over one results list — modeled as a toggle group
+  // (role="group" + aria-pressed), not ARIA tabs (which would need tabpanels,
+  // aria-controls, and roving tabindex for content that does not exist here).
   return (
     <div
       data-testid="differential-result-type-tabs"
-      role="tablist"
+      role="group"
       aria-label="Result type"
       className="polished-scroll flex max-w-full items-center gap-1 overflow-x-auto rounded-lg border border-[color:var(--border)] bg-[color:var(--surface-raised)] p-1 shadow-[var(--shadow-inset)]"
     >
@@ -289,8 +292,7 @@ function ResultTypeTabs({
           <button
             key={tab.id}
             type="button"
-            role="tab"
-            aria-selected={active}
+            aria-pressed={active}
             aria-label={`${tab.label} (${tab.count})`}
             onClick={() => onFilterChange(tab.id)}
             className={cn(
diff --git a/src/components/clinical-dashboard/global-search-shell.tsx b/src/components/clinical-dashboard/global-search-shell.tsx
index a13d9efda..a3397ec2c 100644
--- a/src/components/clinical-dashboard/global-search-shell.tsx
+++ b/src/components/clinical-dashboard/global-search-shell.tsx
@@ -593,7 +593,7 @@ function GlobalStandaloneSearchShellClient({
                 ? "max-sm:pb-[var(--mobile-composer-reserve)] sm:pb-[calc(9rem+env(safe-area-inset-bottom))]"
                 : useCompactBottomSearch
                   ? "max-sm:pb-[var(--mobile-composer-reserve)] sm:pb-8"
-                  : "max-sm:pb-[var(--mobile-composer-reserve)] sm:pb-[calc(9rem+env(safe-area-inset-bottom))] sm:pb-8",
+                  : "max-sm:pb-[var(--mobile-composer-reserve)] sm:pb-[calc(9rem+env(safe-area-inset-bottom))]",
           )}
         >
           <div className="max-sm:flex max-sm:min-h-0 max-sm:flex-1 max-sm:flex-col">
diff --git a/tests/ui-tools.spec.ts b/tests/ui-tools.spec.ts
index 4760c1dba..dc3dff586 100644
--- a/tests/ui-tools.spec.ts
+++ b/tests/ui-tools.spec.ts
@@ -1263,11 +1263,11 @@ test.describe("Clinical KB tools launcher", () => {
     await expect(page.getByTestId("differentials-search-results")).toBeVisible();
     const tabs = page.getByTestId("differential-result-type-tabs");
     await expect(tabs).toBeVisible();
-    await expect(tabs.getByRole("tab", { name: /All \(\d+\)/ })).toBeVisible();
-    await expect(tabs.getByRole("tab", { name: /Presentations \(\d+\)/ })).toBeVisible();
-    await expect(tabs.getByRole("tab", { name: /Diagnoses \(\d+\)/ })).toBeVisible();
+    await expect(tabs.getByRole("button", { name: /All \(\d+\)/ })).toBeVisible();
+    await expect(tabs.getByRole("button", { name: /Presentations \(\d+\)/ })).toBeVisible();
+    await expect(tabs.getByRole("button", { name: /Diagnoses \(\d+\)/ })).toBeVisible();
 
-    const tabMetrics = await tabs.getByRole("tab").evaluateAll((buttons) =>
+    const tabMetrics = await tabs.getByRole("button").evaluateAll((buttons) =>
       buttons.map((button) => {
         const rect = button.getBoundingClientRect();
         return { height: rect.height, scrollHeight: button.scrollHeight };
@@ -1359,11 +1359,11 @@ test.describe("Clinical KB tools launcher", () => {
     await expect(page.getByTestId("differentials-search-results")).toBeVisible();
     const tabs = page.getByTestId("differential-result-type-tabs");
     await expect(tabs).toBeVisible();
-    await expect(tabs.getByRole("tab", { name: "All (8)" })).toBeVisible();
-    await expect(tabs.getByRole("tab", { name: "Presentations (1)" })).toBeVisible();
-    await expect(tabs.getByRole("tab", { name: "Diagnoses (7)" })).toBeVisible();
+    await expect(tabs.getByRole("button", { name: "All (8)" })).toBeVisible();
+    await expect(tabs.getByRole("button", { name: "Presentations (1)" })).toBeVisible();
+    await expect(tabs.getByRole("button", { name: "Diagnoses (7)" })).toBeVisible();
 
-    const tabMetrics = await tabs.getByRole("tab").evaluateAll((tabElements) =>
+    const tabMetrics = await tabs.getByRole("button").evaluateAll((tabElements) =>
       tabElements.map((tab) => {
         const rect = tab.getBoundingClientRect();
         return { height: rect.height, scrollHeight: tab.scrollHeight };