diff --git a/craft/src/components/sections/ContentSlider.toHtml.test.ts b/craft/src/components/sections/ContentSlider.toHtml.test.ts
new file mode 100644
index 0000000..39857f7
--- /dev/null
+++ b/craft/src/components/sections/ContentSlider.toHtml.test.ts
@@ -0,0 +1,36 @@
+import { describe, test, expect } from 'vitest';
+import { ContentSlider } from './ContentSlider';
+
+const toHtml = (ContentSlider as any).toHtml;
+
+const slides = [
+  { type: 'image' as const, heading: 'One' },
+  { type: 'image' as const, heading: 'Two' },
+  { type: 'image' as const, heading: 'Three' },
+];
+
+describe('ContentSlider.toHtml accessibility (F1.1)', () => {
+  test('prev/next arrows get aria-labels and are real buttons', () => {
+    const { html } = toHtml({ slides, showArrows: true }, '');
+    expect(html).toMatch(/<button[^>]*aria-label="Previous slide"/);
+    expect(html).toMatch(/<button[^>]*aria-label="Next slide"/);
+  });
+
+  test('dot buttons get "Go to slide N" aria-labels', () => {
+    const { html } = toHtml({ slides, showDots: true }, '');
+    expect(html).toMatch(/<button[^>]*aria-label="Go to slide 1"/);
+    expect(html).toMatch(/<button[^>]*aria-label="Go to slide 2"/);
+    expect(html).toMatch(/<button[^>]*aria-label="Go to slide 3"/);
+  });
+
+  test('slides are wrapped in an aria-live="polite" region', () => {
+    const { html } = toHtml({ slides }, '');
+    expect(html).toContain('aria-live="polite"');
+  });
+
+  test('decorative chevron icons in arrows are aria-hidden', () => {
+    const { html } = toHtml({ slides, showArrows: true }, '');
+    expect(html).toMatch(/<i class="fa fa-chevron-left" aria-hidden="true"><\/i>/);
+    expect(html).toMatch(/<i class="fa fa-chevron-right" aria-hidden="true"><\/i>/);
+  });
+});
diff --git a/craft/src/components/sections/ContentSlider.tsx b/craft/src/components/sections/ContentSlider.tsx
index 0d6cd11..1395ada 100644
--- a/craft/src/components/sections/ContentSlider.tsx
+++ b/craft/src/components/sections/ContentSlider.tsx
@@ -289,19 +289,21 @@ ContentSlider.craft = {
   }).join('\n  ');
 
   const arrowsHtml = showArrows && items.length > 1
-    ? `<button onclick="${uid}_prev()" style="position:absolute;top:50%;left:16px;transform:translateY(-50%);width:40px;height:40px;border-radius:50%;border:none;background:rgba(255,255,255,0.9);color:#18181b;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:2;box-shadow:0 2px 8px rgba(0,0,0,0.15)"><i class="fa fa-chevron-left"></i></button>
-  <button onclick="${uid}_next()" style="position:absolute;top:50%;right:16px;transform:translateY(-50%);width:40px;height:40px;border-radius:50%;border:none;background:rgba(255,255,255,0.9);color:#18181b;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:2;box-shadow:0 2px 8px rgba(0,0,0,0.15)"><i class="fa fa-chevron-right"></i></button>`
+    ? `<button onclick="${uid}_prev()" aria-label="Previous slide" style="position:absolute;top:50%;left:16px;transform:translateY(-50%);width:40px;height:40px;border-radius:50%;border:none;background:rgba(255,255,255,0.9);color:#18181b;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:2;box-shadow:0 2px 8px rgba(0,0,0,0.15)"><i class="fa fa-chevron-left" aria-hidden="true"></i></button>
+  <button onclick="${uid}_next()" aria-label="Next slide" style="position:absolute;top:50%;right:16px;transform:translateY(-50%);width:40px;height:40px;border-radius:50%;border:none;background:rgba(255,255,255,0.9);color:#18181b;font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:2;box-shadow:0 2px 8px rgba(0,0,0,0.15)"><i class="fa fa-chevron-right" aria-hidden="true"></i></button>`
     : '';
 
   const dotsHtml = showDots && items.length > 1
     ? `<div style="position:absolute;bottom:16px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:2">
-    ${items.map((_, i) => `<button onclick="${uid}_go(${i})" id="${uid}_d${i}" style="width:10px;height:10px;border-radius:50%;border:none;cursor:pointer;background-color:${i === 0 ? '#ffffff' : 'rgba(255,255,255,0.5)'};transition:background-color 0.3s"></button>`).join('\n    ')}
+    ${items.map((_, i) => `<button onclick="${uid}_go(${i})" id="${uid}_d${i}" aria-label="Go to slide ${i + 1}" style="width:10px;height:10px;border-radius:50%;border:none;cursor:pointer;background-color:${i === 0 ? '#ffffff' : 'rgba(255,255,255,0.5)'};transition:background-color 0.3s"></button>`).join('\n    ')}
   </div>`
     : '';
 
   return {
     html: `<section${sectionStyle ? ` style="${sectionStyle}"` : ''}>
+  <div aria-live="polite">
   ${slidesHtml}
+  </div>
   ${arrowsHtml}
   ${dotsHtml}
   <script>
diff --git a/craft/src/components/sections/Gallery.toHtml.test.ts b/craft/src/components/sections/Gallery.toHtml.test.ts
index 301401b..c064c56 100644
--- a/craft/src/components/sections/Gallery.toHtml.test.ts
+++ b/craft/src/components/sections/Gallery.toHtml.test.ts
@@ -31,3 +31,33 @@ describe('Gallery.toHtml lightbox uses a delegated listener, not per-item onclic
     expect(html).not.toContain('<script>');
   });
 });
+
+describe('Gallery.toHtml lightbox accessibility (F1.3)', () => {
+  test('lightbox overlay has role="dialog", aria-modal, and aria-label', () => {
+    const { html } = toHtml({ images: [{ src: '/a.jpg', alt: 'a' }], lightbox: true }, '');
+    expect(html).toMatch(/role="dialog"/);
+    expect(html).toMatch(/aria-modal="true"/);
+    expect(html).toMatch(/aria-label="[^"]+"/);
+  });
+
+  test('Escape closes the lightbox via the inline script', () => {
+    const { html } = toHtml({ images: [{ src: '/a.jpg', alt: 'a' }], lightbox: true }, '');
+    expect(html).toMatch(/Escape/);
+  });
+
+  test('thumbnails are keyboard-operable when lightbox is enabled (role=button + tabindex=0)', () => {
+    const { html } = toHtml({ images: [{ src: '/a.jpg', alt: 'a' }], lightbox: true }, '');
+    expect(html).toMatch(/data-lb-src="[^"]*"[^>]*role="button"[^>]*tabindex="0"/);
+  });
+
+  test('delegated listener handles Enter/Space for keyboard activation', () => {
+    const { html } = toHtml({ images: [{ src: '/a.jpg' }, { src: '/b.jpg' }], lightbox: true }, '');
+    expect(html).toMatch(/addEventListener\(['"]keydown['"]/);
+  });
+
+  test('lightbox=false: no role="dialog", no role="button" thumbnails', () => {
+    const { html } = toHtml({ images: [{ src: '/a.jpg' }], lightbox: false }, '');
+    expect(html).not.toContain('role="dialog"');
+    expect(html).not.toContain('role="button"');
+  });
+});
diff --git a/craft/src/components/sections/Gallery.tsx b/craft/src/components/sections/Gallery.tsx
index 81d5d62..87dc18b 100644
--- a/craft/src/components/sections/Gallery.tsx
+++ b/craft/src/components/sections/Gallery.tsx
@@ -144,7 +144,7 @@ Gallery.craft = {
     // inline onclick with an interpolated src -- a single delegated click
     // listener below reads it, so a src containing a quote can't break out
     // of a per-item event-handler string.
-    const lbAttr = lightbox ? ` data-lb-src="${escapeAttr(safeUrl(img.src || ''))}"` : '';
+    const lbAttr = lightbox ? ` data-lb-src="${escapeAttr(safeUrl(img.src || ''))}" role="button" tabindex="0"` : '';
     const itemStyle = lightbox ? 'cursor:pointer;position:relative;overflow:hidden;border-radius:8px' : 'position:relative;overflow:hidden;border-radius:8px';
     return `<div${lbAttr} style="${itemStyle}">
       <img src="${escapeAttr(safeUrl(img.src || ''))}" alt="${escapeAttr(img.alt)}" style="width:100%;height:200px;object-fit:cover;display:block;border-radius:8px;background-color:#f1f5f9" />
@@ -157,18 +157,30 @@ Gallery.craft = {
   if (lightbox) {
     gridIdAttr = ` id="${galleryId}_grid"`;
     lightboxHtml = `
-  <div id="${galleryId}_overlay" onclick="${galleryId}_close()" style="display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.9);z-index:9999;justify-content:center;align-items:center;cursor:pointer">
+  <div id="${galleryId}_overlay" role="dialog" aria-modal="true" aria-label="Image preview" onclick="${galleryId}_close()" style="display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.9);z-index:9999;justify-content:center;align-items:center;cursor:pointer">
     <img id="${galleryId}_img" src="" alt="" style="max-width:90%;max-height:90%;object-fit:contain;border-radius:8px" />
   </div>
   <script>
 function ${galleryId}_close(){document.getElementById('${galleryId}_overlay').style.display='none';}
-document.getElementById('${galleryId}_grid').addEventListener('click', function(e){
-  var t = e.target.closest('[data-lb-src]');
-  if(!t) return;
-  var src = t.getAttribute('data-lb-src');
+function ${galleryId}_open(src){
   var o = document.getElementById('${galleryId}_overlay');
   document.getElementById('${galleryId}_img').src = src;
   o.style.display = 'flex';
+}
+document.getElementById('${galleryId}_grid').addEventListener('click', function(e){
+  var t = e.target.closest('[data-lb-src]');
+  if(!t) return;
+  ${galleryId}_open(t.getAttribute('data-lb-src'));
+});
+document.getElementById('${galleryId}_grid').addEventListener('keydown', function(e){
+  if(e.key!=='Enter' && e.key!==' ') return;
+  var t = e.target.closest('[data-lb-src]');
+  if(!t) return;
+  e.preventDefault();
+  ${galleryId}_open(t.getAttribute('data-lb-src'));
+});
+document.addEventListener('keydown', function(e){
+  if(e.key==='Escape'){ ${galleryId}_close(); }
 });
   </script>`;
   }
diff --git a/craft/src/components/sections/Tabs.toHtml.test.ts b/craft/src/components/sections/Tabs.toHtml.test.ts
new file mode 100644
index 0000000..1503eb2
--- /dev/null
+++ b/craft/src/components/sections/Tabs.toHtml.test.ts
@@ -0,0 +1,53 @@
+import { describe, test, expect } from 'vitest';
+import { Tabs } from './Tabs';
+
+const toHtml = (Tabs as any).toHtml;
+
+const tabs = [
+  { label: 'Overview', content: 'Overview content' },
+  { label: 'Features', content: 'Features content' },
+  { label: 'Support', content: 'Support content' },
+];
+
+describe('Tabs.toHtml accessibility (F1.2)', () => {
+  test('tab button container has role="tablist"', () => {
+    const { html } = toHtml({ tabs }, '');
+    expect(html).toMatch(/role="tablist"/);
+  });
+
+  test('each tab button has role="tab", aria-selected, aria-controls', () => {
+    const { html } = toHtml({ tabs }, '');
+    const buttonMatches = html.match(/<button[^>]*role="tab"[^>]*>/g) || [];
+    expect(buttonMatches.length).toBe(3);
+    expect(html).toMatch(/aria-selected="true"/);
+    expect(html).toMatch(/aria-selected="false"/);
+    expect(html).toMatch(/role="tab"[^>]*aria-controls="[^"]+"/);
+  });
+
+  test('each panel has role="tabpanel" and aria-labelledby matching a tab id', () => {
+    const { html } = toHtml({ tabs }, '');
+    const panelMatches = html.match(/role="tabpanel"/g) || [];
+    expect(panelMatches.length).toBe(3);
+
+    // aria-controls on the first tab button should point at an id that
+    // actually exists as a panel's id.
+    const controlsMatch = html.match(/role="tab"[^>]*aria-controls="([^"]+)"/);
+    expect(controlsMatch).toBeTruthy();
+    const controlledId = controlsMatch![1];
+    expect(html).toContain(`id="${controlledId}"`);
+  });
+
+  test('ids linking tab<->panel are deterministic (stable across repeated calls, no randomness)', () => {
+    const { html: html1 } = toHtml({ tabs }, '');
+    const { html: html2 } = toHtml({ tabs }, '');
+    const id1 = html1.match(/role="tab"[^>]*aria-controls="([^"]+)"/)![1];
+    const id2 = html2.match(/role="tab"[^>]*aria-controls="([^"]+)"/)![1];
+    expect(id1).toBe(id2);
+  });
+
+  test('arrow-key navigation is wired in the inline script', () => {
+    const { html } = toHtml({ tabs }, '');
+    expect(html).toMatch(/ArrowRight/);
+    expect(html).toMatch(/ArrowLeft/);
+  });
+});
diff --git a/craft/src/components/sections/Tabs.tsx b/craft/src/components/sections/Tabs.tsx
index 5455584..39df612 100644
--- a/craft/src/components/sections/Tabs.tsx
+++ b/craft/src/components/sections/Tabs.tsx
@@ -124,6 +124,19 @@ Tabs.craft = {
 
 /* ---------- HTML export ---------- */
 
+/**
+ * Deterministic (non-cryptographic) string hash -- djb2 -- used to derive a
+ * stable id scope from existing prop data instead of Math.random/Date.now.
+ * Same input always produces the same output across export runs.
+ */
+function stableHash(seed: string): string {
+  let h = 5381;
+  for (let i = 0; i < seed.length; i++) {
+    h = ((h << 5) + h + seed.charCodeAt(i)) | 0;
+  }
+  return (h >>> 0).toString(36);
+}
+
 (Tabs as any).toHtml = (props: TabsProps, _childrenHtml: string) => {
   const sectionStyle = cssPropsToString({
     padding: '60px 20px',
@@ -137,15 +150,22 @@ Tabs.craft = {
   const inactiveTabColor = props.inactiveTabColor || '#64748b';
   const contentBg = props.contentBg || '#ffffff';
 
-  const tabId = 'tabs_' + Math.random().toString(36).slice(2, 8);
+  // tabId scopes the functional wiring (onclick/getElementById) as well as
+  // the ARIA tab<->panel linking ids. It must be deterministic (no
+  // Math.random) because aria-controls/aria-labelledby need to reference
+  // the SAME id across repeated exports of the same content -- derived from
+  // anchorId when present, otherwise a stable hash of the tab labels (pure
+  // function of the props, not time/randomness).
+  const scopeSeed = props.anchorId || tabs.map((t) => t.label).join('|') + '::' + tabs.length;
+  const tabId = 'tabs_' + stableHash(scopeSeed);
 
   const tabButtons = tabs.map((tab, i) => {
     const isActive = i === 0;
-    return `<button onclick="${tabId}_switch(${i})" id="${tabId}_btn_${i}" style="padding:12px 24px;font-size:14px;font-weight:600;border:none;border-top-left-radius:8px;border-top-right-radius:8px;cursor:pointer;background-color:${isActive ? activeTabBg : inactiveTabBg};color:${isActive ? activeTabColor : inactiveTabColor}">${escapeHtml(tab.label)}</button>`;
+    return `<button onclick="${tabId}_switch(${i})" id="${tabId}_btn_${i}" role="tab" aria-selected="${isActive ? 'true' : 'false'}" aria-controls="${tabId}_panel_${i}" tabindex="${isActive ? '0' : '-1'}" style="padding:12px 24px;font-size:14px;font-weight:600;border:none;border-top-left-radius:8px;border-top-right-radius:8px;cursor:pointer;background-color:${isActive ? activeTabBg : inactiveTabBg};color:${isActive ? activeTabColor : inactiveTabColor}">${escapeHtml(tab.label)}</button>`;
   }).join('\n      ');
 
   const tabPanels = tabs.map((tab, i) => {
-    return `<div id="${tabId}_panel_${i}" style="padding:24px;background-color:${contentBg};border:1px solid #e2e8f0;border-top:none;border-bottom-left-radius:8px;border-bottom-right-radius:8px;font-size:14px;line-height:1.7;color:#4b5563;min-height:100px;${i !== 0 ? 'display:none' : ''}">${escapeHtml(tab.content)}</div>`;
+    return `<div id="${tabId}_panel_${i}" role="tabpanel" aria-labelledby="${tabId}_btn_${i}" tabindex="0" style="padding:24px;background-color:${contentBg};border:1px solid #e2e8f0;border-top:none;border-bottom-left-radius:8px;border-bottom-right-radius:8px;font-size:14px;line-height:1.7;color:#4b5563;min-height:100px;${i !== 0 ? 'display:none' : ''}">${escapeHtml(tab.content)}</div>`;
   }).join('\n    ');
 
   const switchScript = `<script>
@@ -156,14 +176,36 @@ function ${tabId}_switch(idx){
     var btn=document.getElementById('${tabId}_btn_'+i);
     btn.style.backgroundColor=i===idx?'${activeTabBg}':'${inactiveTabBg}';
     btn.style.color=i===idx?'${activeTabColor}':'${inactiveTabColor}';
+    btn.setAttribute('aria-selected', i===idx ? 'true' : 'false');
+    btn.setAttribute('tabindex', i===idx ? '0' : '-1');
   }
 }
+(function(){
+  var total=${tabs.length};
+  for(var i=0;i<total;i++){
+    (function(idx){
+      var btn=document.getElementById('${tabId}_btn_'+idx);
+      btn.addEventListener('keydown', function(e){
+        var next=null;
+        if(e.key==='ArrowRight'){ next=(idx+1)%total; }
+        else if(e.key==='ArrowLeft'){ next=(idx-1+total)%total; }
+        else if(e.key==='Home'){ next=0; }
+        else if(e.key==='End'){ next=total-1; }
+        if(next!==null){
+          e.preventDefault();
+          ${tabId}_switch(next);
+          document.getElementById('${tabId}_btn_'+next).focus();
+        }
+      });
+    })(i);
+  }
+})();
 </script>`;
 
   return {
     html: `<section${idAttr}${sectionStyle ? ` style="${sectionStyle}"` : ''}>
   <div style="max-width:800px;margin:0 auto">
-    <div style="display:flex;gap:2px;border-bottom:2px solid #e2e8f0">
+    <div role="tablist" style="display:flex;gap:2px;border-bottom:2px solid #e2e8f0">
       ${tabButtons}
     </div>
     ${tabPanels}