diff --git a/src/components/CodeExample.test.tsx b/src/components/CodeExample.test.tsx
index 772acf3..3f3385e 100644
--- a/src/components/CodeExample.test.tsx
+++ b/src/components/CodeExample.test.tsx
@@ -271,4 +271,25 @@ describe('CodeExample', () => {
       });
     });
   });
+
+  describe('narrow viewport support', () => {
+    it('renders header with responsive class', () => {
+      render(<CodeExample snippets={mockSnippets} />);
+      const header = document.querySelector('.code-sample__header');
+      expect(header).toBeTruthy();
+    });
+
+    it('uses tabs container with BEM class for flex wrap', () => {
+      render(<CodeExample snippets={mockSnippets} />);
+      const tablist = screen.getByRole('tablist');
+      expect(tablist.classList.contains('code-sample__tabs')).toBe(true);
+    });
+
+    it('has accessible copy button label', () => {
+      render(<CodeExample snippets={mockSnippets} />);
+      const copyBtn = screen.getByLabelText(/copy code/i);
+      expect(copyBtn).toBeTruthy();
+      expect(copyBtn.classList.contains('code-sample__copy')).toBe(true);
+    });
+  });
 });
diff --git a/src/components/CodeExample.tsx b/src/components/CodeExample.tsx
index fd1ef32..f747455 100644
--- a/src/components/CodeExample.tsx
+++ b/src/components/CodeExample.tsx
@@ -135,15 +135,7 @@ export default function CodeExample({
     <div className="code-sample">
       {/* Header Section: Contains Language Tabs and Copy Button */}
       <div
-        className="no-print"
-        style={{
-          display: "flex",
-          justifyContent: "space-between",
-          alignItems: "center",
-          padding: "8px 12px",
-          background: "var(--bg-subtle, #f9f9f9)",
-          borderBottom: "1px solid var(--border-subtle)",
-        }}
+        className="no-print code-sample__header"
       >
         {/* Navigation Tabs List with Roving Tabindex */}
         <div 
diff --git a/src/print.test.ts b/src/print.test.ts
index 98831a9..ef086f6 100644
--- a/src/print.test.ts
+++ b/src/print.test.ts
@@ -58,7 +58,7 @@ describe("no-print markup", () => {
 
   it("marks CodeExample header controls as no-print", () => {
     const codeExample = read("src/components/CodeExample.tsx");
-    expect(codeExample).toMatch(/className="no-print"/);
+    expect(codeExample).toMatch(/className=".*no-print.*"/);
   });
 
   it("does not import the removed print.css file", () => {
diff --git a/src/styles/code.css b/src/styles/code.css
index f9b7840..b6f7e0e 100644
--- a/src/styles/code.css
+++ b/src/styles/code.css
@@ -36,6 +36,7 @@
 
 .code-sample__tabs {
   display: flex;
+  flex-wrap: wrap;
   gap: 4px;
 }
 
@@ -98,6 +99,78 @@
   overflow: hidden;
 }
 
+/* Narrow viewport (≤480px): adjust layout for mobile */
+@media (max-width: 480px) {
+  .code-sample__header {
+    flex-direction: column;
+    align-items: stretch;
+    gap: 8px;
+    padding: 8px;
+  }
+
+  .code-sample__tabs {
+    overflow-x: auto;
+    flex-wrap: nowrap;
+    -webkit-overflow-scrolling: touch;
+    scrollbar-width: none;
+  }
+  .code-sample__tabs::-webkit-scrollbar {
+    display: none;
+  }
+
+  .code-sample__tab {
+    flex-shrink: 0;
+    min-height: 36px;
+    padding: 6px 10px;
+    font-size: 10px;
+  }
+
+  .code-sample__copy {
+    align-self: flex-end;
+    min-height: 44px;
+    min-width: 80px;
+    padding: 8px 14px;
+    font-size: 12px;
+  }
+
+  .code-sample__panel {
+    padding: 12px 8px;
+  }
+
+  .code-sample__pre {
+    font-size: 12px;
+  }
+}
+
+/* Extra-narrow viewport (≤375px): compact layout for small phones */
+@media (max-width: 375px) {
+  .code-sample__header {
+    padding: 6px;
+    gap: 6px;
+  }
+
+  .code-sample__tab {
+    min-height: 36px;
+    padding: 5px 8px;
+    font-size: 9px;
+  }
+
+  .code-sample__copy {
+    min-height: 44px;
+    min-width: 72px;
+    padding: 6px 10px;
+    font-size: 11px;
+  }
+
+  .code-sample__panel {
+    padding: 10px 6px;
+  }
+
+  .code-sample__pre {
+    font-size: 11px;
+  }
+}
+
 /* Reduced motion support */
 @media (prefers-reduced-motion: reduce) {
   .code-sample__tab {