diff --git a/apps/web/.storybook/test-runner.js b/apps/web/.storybook/test-runner.js
index 7572f85..0cb4219 100644
--- a/apps/web/.storybook/test-runner.js
+++ b/apps/web/.storybook/test-runner.js
@@ -3,8 +3,10 @@
 // headless iframe size that @storybook/test-runner navigates to directly.
 export default {
   async preVisit(page, context) {
-    if (context.id?.startsWith('pages-catalogpage--mobile')) {
-      await page.setViewportSize({ width: 375, height: 900 });
+    if (context.id?.includes('--enlarged')) {
+      await page.setViewportSize({ width: 640, height: 900 });
+    } else if (context.id?.includes('--mobile')) {
+      await page.setViewportSize({ width: 320, height: 900 });
     }
   },
 };
diff --git a/apps/web/src/components/atoms/ConditionBadge.stories.js b/apps/web/src/components/atoms/ConditionBadge.stories.js
index 2754c72..030726e 100644
--- a/apps/web/src/components/atoms/ConditionBadge.stories.js
+++ b/apps/web/src/components/atoms/ConditionBadge.stories.js
@@ -2,4 +2,5 @@ import ConditionBadge from './ConditionBadge.vue';
 
 export default { title: 'Atoms/ConditionBadge', component: ConditionBadge };
 export const Unselected = { args: { label: 'Near Mint', selected: false } };
-export const Selected = { args: { label: 'Near Mint', selected: true } };
\ No newline at end of file
+export const Selected = { args: { label: 'Near Mint', selected: true } };
+export const ReadOnly = { args: { label: 'Near Mint', interactive: false } };
diff --git a/apps/web/src/components/atoms/ConditionBadge.vue b/apps/web/src/components/atoms/ConditionBadge.vue
index 94ec55c..4558789 100644
--- a/apps/web/src/components/atoms/ConditionBadge.vue
+++ b/apps/web/src/components/atoms/ConditionBadge.vue
@@ -1,15 +1,17 @@
 <script setup>
 defineProps({
   label: { type: String, required: true },
+  interactive: { type: Boolean, default: true },
   selected: { type: Boolean, default: false },
 });
 defineEmits(['select']);
 </script>
 
 <template>
-  <button :class="['condition', { 'condition--selected': selected }]" type="button" @click="$emit('select')">
+  <button v-if="interactive" :class="['condition', { 'condition--selected': selected }]" type="button" @click="$emit('select')">
     {{ label }}
   </button>
+  <span v-else class="condition">{{ label }}</span>
 </template>
 
 <style scoped lang="scss">
diff --git a/apps/web/src/components/molecules/ImageGallery.scss b/apps/web/src/components/molecules/ImageGallery.scss
index 1edc76a..abeab82 100644
--- a/apps/web/src/components/molecules/ImageGallery.scss
+++ b/apps/web/src/components/molecules/ImageGallery.scss
@@ -2,6 +2,6 @@
 .image-gallery__stage { display: grid; place-items: center; min-height: 280px; border-radius: var(--radius-xl); background: var(--color-stage); overflow: hidden; }
 .image-gallery__stage img { width: 100%; height: 100%; min-height: 280px; object-fit: contain; }
 .image-gallery__placeholder { color: var(--color-text-muted); font-family: var(--font-display); font-size: var(--text-2xl); font-weight: var(--weight-bold); }
-.image-gallery__controls { display: flex; gap: var(--space-2); }
+.image-gallery__controls { display: flex; flex-wrap: wrap; gap: var(--space-2); }
 .image-gallery__controls button { min-width: 44px; min-height: 44px; border: var(--border-thin) solid var(--color-border-strong); border-radius: var(--radius-md); background: var(--color-surface); color: var(--color-text); }
 .image-gallery__controls button.image-gallery__thumb--selected { border-color: var(--color-interactive); box-shadow: var(--glow-selection); color: var(--color-interactive-text); }
\ No newline at end of file
diff --git a/apps/web/src/components/molecules/ImageGallery.stories.js b/apps/web/src/components/molecules/ImageGallery.stories.js
index e2392a1..f24d10a 100644
--- a/apps/web/src/components/molecules/ImageGallery.stories.js
+++ b/apps/web/src/components/molecules/ImageGallery.stories.js
@@ -1,3 +1,4 @@
+import { expect, within } from '@storybook/test';
 import ImageGallery from "./ImageGallery.vue";
 
 export default { title: "Molecules/ImageGallery", component: ImageGallery };
@@ -47,3 +48,10 @@ export const LoadingImage = {
   },
   parameters: { chromatic: { delay: 1000 } },
 };
+
+export const BrokenApiImageFallback = {
+  args: { images: [{ id: 'broken-api', url: '/fixtures/missing-api-image.webp', altText: 'Back of collectible' }] },
+  play: async ({ canvasElement }) => {
+    await expect(await within(canvasElement).findByRole('img', { name: 'Collectible image unavailable' })).toBeVisible();
+  },
+};
diff --git a/apps/web/src/components/molecules/ImageGallery.vue b/apps/web/src/components/molecules/ImageGallery.vue
index 648e965..97d58a7 100644
--- a/apps/web/src/components/molecules/ImageGallery.vue
+++ b/apps/web/src/components/molecules/ImageGallery.vue
@@ -69,12 +69,12 @@ onMounted(() => markLoading(props.images[selectedIndex.value]));
         class="image-gallery__placeholder"
         role="img"
         :aria-label="
-          props.images[selectedIndex]?.src
+          (props.images[selectedIndex]?.src ?? props.images[selectedIndex]?.url)
             ? 'Collectible image unavailable'
             : 'No collectible image available'
         "
         >{{
-          props.images[selectedIndex]?.src
+          (props.images[selectedIndex]?.src ?? props.images[selectedIndex]?.url)
             ? "IMAGE UNAVAILABLE"
             : (props.images[selectedIndex]?.label ?? "IMAGE")
         }}</span
@@ -83,6 +83,7 @@ onMounted(() => markLoading(props.images[selectedIndex.value]));
     <div
       v-if="props.images.length > 1"
       class="image-gallery__controls"
+      role="group"
       aria-label="Gallery images"
     >
       <button
@@ -90,7 +91,7 @@ onMounted(() => markLoading(props.images[selectedIndex.value]));
         :key="image.id"
         :class="{ 'image-gallery__thumb--selected': index === selectedIndex }"
         type="button"
-        :aria-label="`Show image ${index + 1}: ${image.alt}`"
+        :aria-label="`Show image ${index + 1}: ${image.altText || image.alt || image.label || 'Collectible image'}`"
         :aria-current="index === selectedIndex ? 'true' : undefined"
         @click="
           selectedIndex = index;
diff --git a/apps/web/src/components/organisms/CollectibleDetail.stories.js b/apps/web/src/components/organisms/CollectibleDetail.stories.js
index 8fda1ee..08031a8 100644
--- a/apps/web/src/components/organisms/CollectibleDetail.stories.js
+++ b/apps/web/src/components/organisms/CollectibleDetail.stories.js
@@ -1,4 +1,4 @@
-import { expect, within } from '@storybook/test';
+import { expect, userEvent, within } from '@storybook/test';
 import CollectibleDetail from "./CollectibleDetail.vue";
 
 export default {
@@ -68,3 +68,43 @@ export const SellerDescriptionDark = {
 
 export const PendingSellerDescriptionDark = { ...SellerDescriptionDark, args: { ...ListingDetail.args, status: 'PENDING' } };
 export const SoldSellerDescriptionDark = { ...SellerDescriptionDark, args: { ...ListingDetail.args, status: 'SOLD' } };
+
+export const MobileSellerContact = {
+  args: {
+    ...ListingDetail.args,
+    title: 'Charizard-ex-Special-Illustration-Rare-Collector-Edition',
+    sellerContactEmail: 'collectibles-and-trading-cards@independent-collector.example',
+    images: Array.from({ length: 10 }, (_, index) => ({ id: `copy-${index}`, altText: `Collectible view ${index + 1}`, label: `VIEW ${index + 1}` })),
+  },
+  decorators: [() => ({ template: '<main style="max-width: 100%; padding: 16px; background: var(--color-background); color: var(--color-text)"><story /></main>' })],
+  play: async ({ canvasElement }) => {
+    const canvas = within(canvasElement);
+    const first = canvas.getByRole('button', { name: 'Show image 1: Collectible view 1' });
+    const second = canvas.getByRole('button', { name: 'Show image 2: Collectible view 2' });
+    first.focus();
+    await userEvent.tab();
+    await expect(second).toHaveFocus();
+    await userEvent.keyboard('{Enter}');
+    await expect(second).toHaveAttribute('aria-current', 'true');
+    await expect(first).not.toHaveAttribute('aria-current');
+    await expect(canvas.queryByRole('button', { name: 'Near Mint' })).toBeNull();
+    for (let index = 0; index < 9; index += 1) await userEvent.tab();
+    const email = canvas.getByRole('link', { name: /collectibles-and-trading-cards@/ });
+    await expect(email).toHaveFocus();
+    await expect(email).toHaveAttribute('href', `mailto:${MobileSellerContact.args.sellerContactEmail}`);
+    await userEvent.tab();
+    await expect(canvas.getByRole('link', { name: '555-0100' })).toHaveFocus();
+    await expect(document.documentElement.scrollWidth).toBeLessThanOrEqual(window.innerWidth);
+  },
+};
+
+
+// CSS text resizing complements the 640px viewport (1280px at 200% zoom).
+export const EnlargedSellerContact = {
+  ...MobileSellerContact,
+  beforeEach: () => {
+    const original = document.documentElement.style.fontSize;
+    document.documentElement.style.fontSize = '200%';
+    return () => { document.documentElement.style.fontSize = original; };
+  },
+};
diff --git a/apps/web/src/components/organisms/CollectibleDetail.vue b/apps/web/src/components/organisms/CollectibleDetail.vue
index 18c8a24..94afe63 100644
--- a/apps/web/src/components/organisms/CollectibleDetail.vue
+++ b/apps/web/src/components/organisms/CollectibleDetail.vue
@@ -39,7 +39,7 @@ defineProps({
           label="Market value"
           :amount-minor="marketValueMinor"
         />
-        <ConditionBadge v-if="condition" :label="condition" />
+        <ConditionBadge v-if="condition" :label="condition" :interactive="false" />
       </div>
       <p v-if="marketValueUpdatedAt" class="collectible-detail__market-updated">
         Market value updated
@@ -70,6 +70,11 @@ defineProps({
   grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
   gap: var(--space-12);
   align-items: start;
+  overflow-wrap: anywhere;
+}
+.collectible-detail__gallery,
+.collectible-detail__identity {
+  min-width: 0;
 }
 .collectible-detail__identity {
   display: grid;
diff --git a/apps/web/src/pages/CatalogPage.stories.js b/apps/web/src/pages/CatalogPage.stories.js
index 591706e..f16ebdb 100644
--- a/apps/web/src/pages/CatalogPage.stories.js
+++ b/apps/web/src/pages/CatalogPage.stories.js
@@ -26,14 +26,38 @@ export const MobileFilterDisclosure = {
     await expect(toggle).toHaveAttribute('aria-expanded', 'false');
     await expect(setFilter).not.toBeVisible();
 
-    await userEvent.click(toggle);
+    toggle.focus();
+    await userEvent.keyboard('{Enter}');
 
     await expect(toggle).toHaveAttribute('aria-expanded', 'true');
     await expect(setFilter).toBeVisible();
 
-    await userEvent.click(toggle);
+    toggle.focus();
+    await userEvent.keyboard(' ');
 
     await expect(toggle).toHaveAttribute('aria-expanded', 'false');
     await expect(setFilter).not.toBeVisible();
   },
 };
+
+
+export const MobilePopulatedCatalog = {
+  beforeEach: () => {
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = async (url) => new Response(JSON.stringify({ data: String(url).includes('/search?') ? {
+      items: [{ id: 'collectible-1', productName: 'Charizard ex special illustration rare', askingPriceMinor: 2500, status: 'AVAILABLE' }],
+      pagination: { page: 1, limit: 20, total: 1, totalPages: 1 },
+    } : [] }), { headers: { 'content-type': 'application/json' } });
+    return () => { globalThis.fetch = originalFetch; };
+  },
+  play: async ({ canvasElement }) => {
+    const canvas = within(canvasElement);
+    const listing = await canvas.findByRole('link', { name: /Charizard ex/ });
+    const toggle = canvas.getByRole('button', { name: /Filters/ });
+    toggle.focus();
+    await userEvent.tab();
+    await expect(listing).toHaveFocus();
+    await expect(listing).toHaveAttribute('href', '/listings/collectible-1');
+    await expect(document.documentElement.scrollWidth).toBeLessThanOrEqual(window.innerWidth);
+  },
+};
diff --git a/apps/web/src/pages/ListingDetailPage.stories.js b/apps/web/src/pages/ListingDetailPage.stories.js
index 5c5db05..4d66ae6 100644
--- a/apps/web/src/pages/ListingDetailPage.stories.js
+++ b/apps/web/src/pages/ListingDetailPage.stories.js
@@ -19,3 +19,25 @@ export const PublicSellerDescription = {
     await expect(await within(canvasElement).findByText('Independent Pokémon collector.')).toBeVisible();
   },
 };
+
+export const Loading = {
+  beforeEach: () => {
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = () => new Promise(() => {});
+    return () => { globalThis.fetch = originalFetch; };
+  },
+  play: async ({ canvasElement }) => {
+    await expect(within(canvasElement).getByRole('status')).toHaveTextContent('Loading');
+  },
+};
+export const Unavailable = {
+  beforeEach: () => {
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = async () => new Response(JSON.stringify({ error: { message: 'This collectible is unavailable.' } }), { status: 404 });
+    return () => { globalThis.fetch = originalFetch; };
+  },
+  play: async ({ canvasElement }) => {
+    await expect(await within(canvasElement).findByRole('alert')).toHaveTextContent('Listing not found.');
+    await expect(within(canvasElement).getByRole('link', { name: 'Back to catalog' })).toHaveAttribute('href', '/');
+  },
+};
diff --git a/apps/web/src/pages/ListingDetailPage.vue b/apps/web/src/pages/ListingDetailPage.vue
index f9f9447..f29a7fb 100644
--- a/apps/web/src/pages/ListingDetailPage.vue
+++ b/apps/web/src/pages/ListingDetailPage.vue
@@ -26,8 +26,8 @@ onMounted(async () => {
     <RouterLink class="detail-back" :to="{ name: 'catalog' }"
       >Back to catalog</RouterLink
     >
-    <p v-if="isLoading" class="catalog-state">Loading listing...</p>
-    <p v-else-if="error" class="catalog-state catalog-state--error">
+    <p v-if="isLoading" class="catalog-state" role="status">Loading listing...</p>
+    <p v-else-if="error" class="catalog-state catalog-state--error" role="alert">
       {{ error.message }}
     </p>
     <CollectibleDetail
diff --git a/apps/web/src/pages/ProductDetailPage.stories.js b/apps/web/src/pages/ProductDetailPage.stories.js
index d9df1ff..07e80c4 100644
--- a/apps/web/src/pages/ProductDetailPage.stories.js
+++ b/apps/web/src/pages/ProductDetailPage.stories.js
@@ -19,3 +19,25 @@ export const PublicSellerDescription = {
     await expect(await within(canvasElement).findByText('Independent Pokémon collector.')).toBeVisible();
   },
 };
+
+export const Loading = {
+  beforeEach: () => {
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = () => new Promise(() => {});
+    return () => { globalThis.fetch = originalFetch; };
+  },
+  play: async ({ canvasElement }) => {
+    await expect(within(canvasElement).getByRole('status')).toHaveTextContent('Loading');
+  },
+};
+export const Unavailable = {
+  beforeEach: () => {
+    const originalFetch = globalThis.fetch;
+    globalThis.fetch = async () => new Response(JSON.stringify({ error: { message: 'This collectible is unavailable.' } }), { status: 404 });
+    return () => { globalThis.fetch = originalFetch; };
+  },
+  play: async ({ canvasElement }) => {
+    await expect(await within(canvasElement).findByRole('alert')).toHaveTextContent('Product not found.');
+    await expect(within(canvasElement).getByRole('link', { name: 'Back to catalog' })).toHaveAttribute('href', '/');
+  },
+};
diff --git a/apps/web/src/pages/ProductDetailPage.vue b/apps/web/src/pages/ProductDetailPage.vue
index c3c815c..f1ad71b 100644
--- a/apps/web/src/pages/ProductDetailPage.vue
+++ b/apps/web/src/pages/ProductDetailPage.vue
@@ -24,8 +24,8 @@ onMounted(async () => {
 <template>
   <main class="detail-page">
     <RouterLink class="detail-back" :to="{ name: 'catalog' }">Back to catalog</RouterLink>
-    <p v-if="isLoading" class="catalog-state">Loading product...</p>
-    <p v-else-if="error" class="catalog-state catalog-state--error">{{ error.message }}</p>
+    <p v-if="isLoading" class="catalog-state" role="status">Loading product...</p>
+    <p v-else-if="error" class="catalog-state catalog-state--error" role="alert">{{ error.message }}</p>
     <CollectibleDetail
       v-else-if="product"
       :title="product.name"
diff --git a/docs/ACCESSIBILITY.md b/docs/ACCESSIBILITY.md
index afe119c..0987ac4 100644
--- a/docs/ACCESSIBILITY.md
+++ b/docs/ACCESSIBILITY.md
@@ -29,3 +29,44 @@ Run automated accessibility testing in CI.
 Serious accessibility regressions should fail CI.
 
 Automated tests do not replace manual keyboard and assistive-technology review for important workflows.
+
+## Public browsing review — 2026-09-10
+
+Scope: catalog filters and listing links, listing/product detail states, image
+selection, condition display, and seller contact links. Fixtures use public DTO
+shapes, including `url`/`altText`, ten images, and a long seller email.
+
+Findings fixed:
+
+- Gallery buttons now use API `altText`, with legacy `alt` and label fallbacks,
+  rather than announcing “undefined”. Controls form a named group and wrap.
+- Failed API `url` images now announce an unavailable image rather than claiming
+  no image exists.
+- Detail text and grid children reflow without forcing horizontal scrolling;
+  long seller contact addresses remain readable and focusable.
+- Read-only detail conditions are text, removing a button that had no action.
+- Listing and product loading/error messages expose status/alert roles.
+
+Browser review: Codex in-app browser, keyboard and accessibility-tree inspection,
+with screenshots checked at a 320px viewport. Tab/Enter select gallery images,
+selection remains indicated, Tab reaches email then phone without a condition
+button detour, and focus outlines remain visible. The populated catalog's filter
+disclosure opens via Enter; expanded filters and the listing card fit at 320px.
+Contact targets were inspected without launching email or telephone applications.
+
+Enlargement review: 640px viewport (the CSS layout width of a 1280px browser at
+200% zoom), additionally with root text enlarged to 200%. Detail text, gallery
+controls, and seller links remain readable and keyboard-accessible without
+horizontal scrolling. This is reflow/text-resize coverage, not a native browser
+zoom result: browser-zoom shortcuts were unavailable in the review browser.
+
+Regression coverage: mobile catalog filter keyboard interaction and listing
+focus/link target; gallery selection and contact focus order; narrow and enlarged
+reflow assertions; read-only condition story; broken API image fallback; and
+loading/not-found announcements on both public detail pages. Existing light/dark,
+empty-image, sold, and pending stories remain part of the accessibility gate.
+
+Remaining manual coverage: native browser zoom, screen-reader speech and route
+announcements (VoiceOver/Safari or NVDA/Firefox), and the full live-data navigation
+journey. Automated checks and accessibility-tree inspection do not certify WCAG
+conformance or replace those reviews.
diff --git a/docs/IMPLEMENTATION-STATUS.md b/docs/IMPLEMENTATION-STATUS.md
index 530e713..ff8bfff 100644
--- a/docs/IMPLEMENTATION-STATUS.md
+++ b/docs/IMPLEMENTATION-STATUS.md
@@ -122,7 +122,7 @@ docker context use orbstack
 
 Verified locally: `npm test` passes 166 tests with no failures (23 domain, 79 application, and 64 HTTP); worker tests, web tests, web build, Storybook build, Storybook interaction/accessibility checks, integration tests, and authenticated E2E workflows also pass when their required local services and credentials are available.
 
-### Latest Vertical Slice: Public Seller Description
+### Public Seller Description
 
 - Sellers can save, edit, and clear an optional public description in Settings.
 - Descriptions are trimmed plain text, limited to 2,000 characters server-side, and stored in existing seller settings JSON without a migration.
@@ -131,7 +131,14 @@ Verified locally: `npm test` passes 166 tests with no failures (23 domain, 79 ap
 - Coverage includes validation/partial-update/clearing tests, public HTTP contracts, PostgreSQL repository reads, settings edit/clear interactions, both public page integrations, and absent/plain-text/dark-theme component stories.
 - Validation: 166 API tests, 23 isolated PostgreSQL/Redis integration tests, 10 web tests, production web build, Storybook build, and Storybook interaction/accessibility runner (32 suites / 84 tests).
 
-Next bounded slice: review the public catalog → listing/product detail → seller contact journey with keyboard navigation, mobile layout, and 200% zoom; fix discovered accessibility issues and add regression stories/tests. Record manual results in `docs/ACCESSIBILITY.md`. This advances the documented accessibility milestone without requiring external provider credentials.
+### Latest Vertical Slice: Public Browsing Accessibility
+
+- Public gallery labels use API image descriptions, controls wrap at narrow widths, and failed API image URLs have an accurate accessible fallback.
+- Long detail text and seller contacts reflow, read-only condition badges no longer add inactive buttons to keyboard navigation, and detail loading/errors expose announcement roles.
+- Added keyboard, 320px reflow, 200% text enlargement, and detail-state regression stories. Browser review and its native-zoom/screen-reader limitations are recorded in `docs/ACCESSIBILITY.md`.
+- Validation: 166 API tests, 10 web tests, production web build, Storybook build, and 32 Storybook suites / 93 tests. This frontend-only slice changes no persistence or API contracts.
+
+Next bounded slice: public route navigation accessibility. Review catalog → listing/product → back navigation with a screen reader, add appropriate page titles and route-focus handling where missing, and cover navigation in browser tests. Include native 200% zoom review.
 
 ## Next Milestone