diff --git a/src/app/ckb-v2-tokens.css b/src/app/ckb-v2-tokens.css
index 16dc2344c1..c33b25ee0a 100644
--- a/src/app/ckb-v2-tokens.css
+++ b/src/app/ckb-v2-tokens.css
@@ -57,6 +57,11 @@
   --measure: 68ch; /* prose measure - never wider */
   --header-h: 4rem; /* 64 */
 
+  /* Responsive breakpoint tokens - standard named scale (Task #336) */
+  --bp-phone: 640px;
+  --bp-tablet: 768px;
+  --bp-desktop: 1024px;
+
   /* Type - 7 steps, each with its own line-height and tracking */
   --text-xs: 0.75rem;
   --text-xs-lh: 1rem;
diff --git a/src/app/globals.css b/src/app/globals.css
index 4fef90d7ad..4bc854abde 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -72,6 +72,11 @@
  * New overlays go through components/ui/sheet.tsx rather than a new layer.
  */
 @theme {
+  /* Named responsive breakpoint tokens (Task #336) */
+  --breakpoint-phone: 640px;
+  --breakpoint-tablet: 768px;
+  --breakpoint-desktop: 1024px;
+
   /* Radius ladder: 4 · 6 · 10 · 12 · 16 · 20 — the 4px grid with two deliberate
      half-steps. `sm` is 6px, for chips and pills that read as too heavy at 8.
      `md` is 10px because it is the control rung, and it is the one value the v2
@@ -277,6 +282,11 @@
 
 /* Theme tokens */
 :root {
+  /* Named responsive breakpoint tokens (Task #336) */
+  --bp-phone: 640px;
+  --bp-tablet: 768px;
+  --bp-desktop: 1024px;
+
   /* Layout constraints */
   --content-max-width: 1440px;
   --rail-width: 480px;
diff --git a/src/components/clinical-dashboard/search-results-header-band.tsx b/src/components/clinical-dashboard/search-results-header-band.tsx
index ae70d088bb..91150ecaf3 100644
--- a/src/components/clinical-dashboard/search-results-header-band.tsx
+++ b/src/components/clinical-dashboard/search-results-header-band.tsx
@@ -802,7 +802,7 @@ export function ResultSortControl({
  * floor from `sm`, exactly like the filter controls.
  */
 const emptyStateAction =
-  "inline-flex min-h-tap items-center gap-1.5 rounded-lg border border-[color:var(--border)] px-3 text-xs font-extrabold text-[color:var(--text-muted)] hover:text-[color:var(--text)] sm:min-h-10";
+  "inline-flex min-h-tap items-center gap-1.5 rounded-lg border border-[color:var(--border)] px-3 text-xs font-semibold text-[color:var(--text-muted)] hover:text-[color:var(--text)] sm:min-h-10";
 
 export function SearchResultsEmptyState({
   modeId,
@@ -978,7 +978,7 @@ export function SearchResultsEmptyState({
           <Search className="h-5 w-5" aria-hidden />
         )}
       </span>
-      <Title className="mt-3 text-sm font-extrabold text-[color:var(--text-heading)]">{emptyTitle}</Title>
+      <Title className="mt-3 text-sm font-semibold text-[color:var(--text-heading)]">{emptyTitle}</Title>
       <p className="mt-1 text-xs font-medium text-[color:var(--text-muted)]">{emptyBody}</p>
       {!filtered ? (
         <div aria-live="polite" className="sr-only">
@@ -999,7 +999,7 @@ export function SearchResultsEmptyState({
               onClick={lastFilter.onRemove}
               data-testid="search-results-empty-remove-filter"
               className={cn(
-                "inline-flex min-h-9 items-center gap-1.5 rounded-lg border border-[color:var(--clinical-accent-border)] bg-[color:var(--clinical-accent-soft)] px-3 text-xs font-extrabold text-[color:var(--clinical-accent)] hover:border-[color:var(--clinical-accent)]",
+                "inline-flex min-h-tap items-center gap-1.5 rounded-lg border border-[color:var(--clinical-accent-border)] bg-[color:var(--clinical-accent-soft)] px-3 text-xs font-semibold text-[color:var(--clinical-accent)] hover:border-[color:var(--clinical-accent)] sm:min-h-9",
                 focusRing,
               )}
             >
diff --git a/src/components/forms/form-detail-page.tsx b/src/components/forms/form-detail-page.tsx
index f98a06840e..0f117ad414 100644
--- a/src/components/forms/form-detail-page.tsx
+++ b/src/components/forms/form-detail-page.tsx
@@ -335,7 +335,7 @@ function DetailCard({
       <button
         type="button"
         onClick={onOpenDetail}
-        className="min-w-0 flex-1 rounded-md text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[color:var(--focus-ring)] focus-visible:ring-offset-2 focus-visible:ring-offset-[color:var(--surface-lux)]"
+        className="min-w-0 flex-1 rounded-md text-left focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)]"
         aria-label={`${label}: ${displayText(card.title)}. Open detail.`}
       >
         {content}
@@ -542,7 +542,7 @@ function PathwayContextCard({
           aria-selected={activeTab === "pathway"}
           onClick={() => setActiveTab("pathway")}
           className={cn(
-            "rounded-md px-3 py-2 text-center transition",
+            "min-h-tap rounded-md px-3 py-2 text-center transition focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)] sm:min-h-9",
             activeTab === "pathway"
               ? "bg-[color:var(--clinical-accent)] text-[color:var(--clinical-accent-contrast)]"
               : "text-[color:var(--text-muted)] hover:bg-[color:var(--surface-subtle)]",
@@ -556,7 +556,7 @@ function PathwayContextCard({
           aria-selected={activeTab === "source"}
           onClick={() => setActiveTab("source")}
           className={cn(
-            "rounded-md px-3 py-2 text-center transition",
+            "min-h-tap rounded-md px-3 py-2 text-center transition focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)] sm:min-h-9",
             activeTab === "source"
               ? "bg-[color:var(--clinical-accent)] text-[color:var(--clinical-accent-contrast)]"
               : "text-[color:var(--text-muted)] hover:bg-[color:var(--surface-subtle)]",
@@ -1066,7 +1066,7 @@ export function FormDetailPage({ form }: { form: FormRecord }) {
                       href={form.source.url}
                       target="_blank"
                       rel="noopener noreferrer"
-                      className="inline-flex min-h-10 items-center justify-center gap-1.5 rounded-lg text-sm font-semibold text-[color:var(--clinical-accent)] hover:underline focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)]"
+                      className="inline-flex min-h-tap items-center justify-center gap-1.5 rounded-lg text-sm font-semibold text-[color:var(--clinical-accent)] hover:underline focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)] sm:min-h-10"
                     >
                       Official
                       <ExternalLink className="h-4 w-4" aria-hidden />
@@ -1077,7 +1077,7 @@ export function FormDetailPage({ form }: { form: FormRecord }) {
                       href={details.localPdfPath}
                       target="_blank"
                       rel="noopener noreferrer"
-                      className="inline-flex min-h-10 items-center justify-center gap-1.5 rounded-lg text-sm font-semibold text-[color:var(--text-muted)] hover:underline focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)]"
+                      className="inline-flex min-h-tap items-center justify-center gap-1.5 rounded-lg text-sm font-semibold text-[color:var(--text-muted)] hover:underline focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)] sm:min-h-10"
                     >
                       Stored copy
                       <Download className="h-4 w-4" aria-hidden />
diff --git a/src/components/mode-home-template.tsx b/src/components/mode-home-template.tsx
index 8a9e89cab1..70865572ed 100644
--- a/src/components/mode-home-template.tsx
+++ b/src/components/mode-home-template.tsx
@@ -99,7 +99,7 @@ export function ModeHomeHero({
       >
         <Heading
           id={`${testId ?? "mode-home"}-title`}
-          className="text-balance text-hero font-extrabold leading-display tracking-normal text-[color:var(--text-heading)]"
+          className="text-balance text-hero font-semibold leading-display tracking-normal text-[color:var(--text-heading)]"
         >
           {title}
         </Heading>
diff --git a/tests/audit-content-services-regressions.test.ts b/tests/audit-content-services-regressions.test.ts
index 16e1a45415..bb53a45971 100644
--- a/tests/audit-content-services-regressions.test.ts
+++ b/tests/audit-content-services-regressions.test.ts
@@ -223,7 +223,8 @@ describe("content and services audit regressions", () => {
     expect(normalizedFormDetailSource).toContain("href={form.source.url}");
     expect(normalizedFormDetailSource).toContain('target="_blank"');
     expect(normalizedFormDetailSource).toContain('rel="noopener noreferrer"');
-    expect(normalizedFormDetailSource).toContain("inline-flex min-h-10");
+    expect(normalizedFormDetailSource).toContain("inline-flex min-h-tap");
+    expect(normalizedFormDetailSource).toContain("sm:min-h-10");
     expect(formDetailSource).toContain("Source link pending");
     expect(formDetailSource).toContain("Official");
   });
diff --git a/tests/design-token-contract.test.ts b/tests/design-token-contract.test.ts
index e2820ee5c5..0373764b9f 100644
--- a/tests/design-token-contract.test.ts
+++ b/tests/design-token-contract.test.ts
@@ -470,3 +470,19 @@ describe("focus ring", () => {
     expect(body, "the shared focus rule must not paint a box-shadow").not.toContain("box-shadow");
   });
 });
+
+describe("responsive breakpoint tokens (Task #336)", () => {
+  it("declares standard named breakpoint tokens in :root, @theme, and ckb-v2", () => {
+    expect(light.get("--bp-phone")).toBe("640px");
+    expect(light.get("--bp-tablet")).toBe("768px");
+    expect(light.get("--bp-desktop")).toBe("1024px");
+
+    expect(v2Light.get("--bp-phone")).toBe("640px");
+    expect(v2Light.get("--bp-tablet")).toBe("768px");
+    expect(v2Light.get("--bp-desktop")).toBe("1024px");
+
+    expect(themeConfigBlock).toContain("--breakpoint-phone: 640px;");
+    expect(themeConfigBlock).toContain("--breakpoint-tablet: 768px;");
+    expect(themeConfigBlock).toContain("--breakpoint-desktop: 1024px;");
+  });
+});