diff --git a/.planning/phases/11-visual-design-responsive-layout-cleanup/11-04-SUMMARY.md b/.planning/phases/11-visual-design-responsive-layout-cleanup/11-04-SUMMARY.md
new file mode 100644
index 0000000..8ba8149
--- /dev/null
+++ b/.planning/phases/11-visual-design-responsive-layout-cleanup/11-04-SUMMARY.md
@@ -0,0 +1,148 @@
+---
+phase: 11-visual-design-responsive-layout-cleanup
+plan: 4
+subsystem: frontend/modals
+tags: [mobile, modals, forms, VISUAL-02, RESP-04]
+dependency_graph:
+  requires: [11-03]
+  provides: [mobile-safe-modals, form-baseline-coverage]
+  affects:
+    - frontend/src/components/sharing/ShareModal.vue
+    - frontend/src/components/cloud/CloudCredentialModal.vue
+    - frontend/src/components/folders/FolderDeleteModal.vue
+    - frontend/src/components/documents/DocumentPreviewModal.vue
+    - frontend/src/views/DocumentView.vue
+tech_stack:
+  added: []
+  patterns:
+    - "max-h-[90vh] overflow-y-auto on modal panels — scroll-safe mobile pattern"
+    - "px-4 sm:px-6 responsive horizontal padding on full-screen preview header"
+    - "data-test attributes on all modal panels for testability"
+    - "focus:outline-none focus:ring-2 focus:ring-indigo-500 — consistent form baseline pattern throughout codebase"
+key_files:
+  created:
+    - frontend/src/components/sharing/__tests__/ShareModal.mobile.test.js
+    - frontend/src/components/cloud/__tests__/CloudCredentialModal.mobile.test.js
+    - frontend/src/components/folders/__tests__/FolderDeleteModal.mobile.test.js
+    - frontend/src/components/documents/__tests__/DocumentPreviewModal.mobile.test.js
+  modified:
+    - frontend/src/components/sharing/ShareModal.vue
+    - frontend/src/components/cloud/CloudCredentialModal.vue
+    - frontend/src/components/folders/FolderDeleteModal.vue
+    - frontend/src/components/documents/DocumentPreviewModal.vue
+    - frontend/src/views/DocumentView.vue
+decisions:
+  - "@tailwindcss/forms plugin active in tailwind.config.js — no drift found, verification task complete"
+  - "focus:outline-none focus:ring-2 focus:ring-indigo-500 is the consistent form baseline pattern throughout entire codebase — no normalization needed"
+  - "DocumentPreviewModal stays full-screen (fixed inset-0) — added responsive px-4 sm:px-6 header padding for narrow viewports"
+  - "DocumentView inline cloud-delete warning modal receives same max-h treatment as dedicated modal components"
+metrics:
+  duration_minutes: 7
+  tasks_completed: 5
+  files_created: 4
+  files_modified: 5
+  completed_date: "2026-06-16"
+---
+
+# Phase 11 Plan 4: Forms Baseline & Mobile-Safe Modals Summary
+
+Verified `@tailwindcss/forms` remains active with a consistent form focus pattern throughout the codebase, and updated all four modal components plus one inline modal to scroll safely on narrow mobile viewports (375x667px).
+
+## What Was Built
+
+### Task 1 — Forms plugin verification
+
+`frontend/tailwind.config.js` confirmed: `import forms from '@tailwindcss/forms'` and `plugins: [forms]` are active. No drift.
+
+### Tasks 2-3 — Form baseline audit and normalization
+
+Full audit of all `<input>`, `<select>`, `<textarea>`, `<input type="checkbox">`, and `<input type="radio">` elements across all Vue components. Findings:
+
+- **Consistent pattern throughout:** `focus:outline-none focus:ring-2 focus:ring-indigo-500` (or `focus:ring-indigo-400` in topic-related components). This is already the standardized baseline.
+- **No conflicting per-component reset styles** found (no `appearance-none`, no `webkit-appearance`, no inline `outline: none`).
+- **No normalization required** — the codebase is already consistent. The forms plugin resets browser defaults and the `focus:ring-*` utility classes provide the visual indicator.
+
+### Task 4 — Modal mobile-safe updates (RESP-04)
+
+All modal panels now have `max-h-[90vh] overflow-y-auto` added to their panel containers:
+
+**`ShareModal.vue`**
+- Panel `class` updated: added `max-h-[90vh] overflow-y-auto`
+- Added `data-test="share-modal-panel"` for testability
+
+**`CloudCredentialModal.vue`**
+- Panel `class` updated: added `max-h-[90vh] overflow-y-auto`
+- Added `data-test="cloud-credential-modal-panel"` for testability
+- The tall WebDAV/Nextcloud form with server URL, username, auth method toggle, advanced section, and password field now scrolls safely on 375px height-constrained viewports
+
+**`FolderDeleteModal.vue`**
+- Panel `class` updated: added `max-h-[90vh] overflow-y-auto`
+- Added `data-test="folder-delete-modal-panel"` for testability
+
+**`DocumentPreviewModal.vue`**
+- Full-screen overlay preserved (`fixed inset-0 flex flex-col`) — this modal intentionally uses the entire viewport
+- Header padding made responsive: `px-4 sm:px-6` (was `px-6`) — prevents filename and close button from touching screen edges at 375px
+- Added `data-test="document-preview-modal"` on overlay and `data-test="preview-modal-header"` on header bar
+
+**`DocumentView.vue` (inline cloud-delete warning modal)**
+- Inline modal panel updated: added `max-h-[90vh] overflow-y-auto`
+- Added `data-test="cloud-delete-modal-panel"` for testability
+
+### Task 5 — Tests
+
+Four new test files created (34 total test files in worktree, 234 tests all pass):
+
+**`ShareModal.mobile.test.js`** (5 tests):
+- VISUAL-02: text input has `focus:ring-2 focus:outline-none` (form baseline)
+- VISUAL-02: select has `focus:ring-2 focus:outline-none` (form baseline)
+- RESP-04: panel has `max-h-[90vh]`
+- RESP-04: panel has `overflow-y-auto`
+- RESP-04: panel has `mx-4` for narrow viewport fit
+
+**`CloudCredentialModal.mobile.test.js`** (3 tests):
+- RESP-04: panel has `max-h-[90vh]`
+- RESP-04: panel has `overflow-y-auto`
+- RESP-04: panel not rendered when `show=false` (v-if gate verified)
+
+**`FolderDeleteModal.mobile.test.js`** (4 tests):
+- RESP-04: panel has `max-h-[90vh]`
+- RESP-04: panel has `overflow-y-auto`
+- RESP-04: panel has `mx-4`
+- Action buttons are accessible (text content check)
+
+**`DocumentPreviewModal.mobile.test.js`** (3 tests):
+- RESP-04: full-screen overlay has `fixed inset-0` classes
+- RESP-04: header has `px-4` (mobile) and `sm:px-6` (640px+)
+- RESP-04: filename `span` has `truncate` class preventing overflow
+
+## Verification
+
+- `npm run test -- --run` (via `./node_modules/.bin/vitest run`): **34 test files, 234 tests, all pass**
+- `npm run build` (via `./node_modules/.bin/vite build`): **succeeds** — all 5 JS chunks + main bundle build cleanly
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Known Stubs
+
+None.
+
+## Threat Flags
+
+None — no network endpoints, auth paths, file access patterns, or schema changes. All changes are frontend layout/presentation classes and test files.
+
+## Self-Check: PASSED
+
+- `frontend/src/components/sharing/ShareModal.vue`: modified — max-h + overflow-y-auto + data-test
+- `frontend/src/components/cloud/CloudCredentialModal.vue`: modified — max-h + overflow-y-auto + data-test
+- `frontend/src/components/folders/FolderDeleteModal.vue`: modified — max-h + overflow-y-auto + data-test
+- `frontend/src/components/documents/DocumentPreviewModal.vue`: modified — responsive px-4, data-test attrs
+- `frontend/src/views/DocumentView.vue`: modified — inline modal max-h + data-test
+- `frontend/src/components/sharing/__tests__/ShareModal.mobile.test.js`: created — 5 tests
+- `frontend/src/components/cloud/__tests__/CloudCredentialModal.mobile.test.js`: created — 3 tests
+- `frontend/src/components/folders/__tests__/FolderDeleteModal.mobile.test.js`: created — 4 tests
+- `frontend/src/components/documents/__tests__/DocumentPreviewModal.mobile.test.js`: created — 3 tests
+- Commit `df53cef` exists in git log: confirmed
+- 34 test files, 234 tests all pass: confirmed
+- Build succeeds: confirmed
diff --git a/frontend/src/components/cloud/CloudCredentialModal.vue b/frontend/src/components/cloud/CloudCredentialModal.vue
index c230a89..c8672af 100644
--- a/frontend/src/components/cloud/CloudCredentialModal.vue
+++ b/frontend/src/components/cloud/CloudCredentialModal.vue
@@ -5,7 +5,7 @@
     @click.self="handleOverlayClick"
     @keydown.escape.window="handleEscape"
   >
-    <div class="bg-white rounded-xl shadow-xl w-full max-w-md p-6">
+    <div data-test="cloud-credential-modal-panel" class="bg-white rounded-xl shadow-xl w-full max-w-md p-6 max-h-[90vh] overflow-y-auto">
       <!-- Header -->
       <div class="flex items-center justify-between mb-5">
         <h3 class="text-xl font-semibold text-gray-900">
diff --git a/frontend/src/components/cloud/__tests__/CloudCredentialModal.mobile.test.js b/frontend/src/components/cloud/__tests__/CloudCredentialModal.mobile.test.js
new file mode 100644
index 0000000..4e88ff0
--- /dev/null
+++ b/frontend/src/components/cloud/__tests__/CloudCredentialModal.mobile.test.js
@@ -0,0 +1,52 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { mount } from '@vue/test-utils'
+import { createPinia, setActivePinia } from 'pinia'
+
+vi.mock('../../../api/client.js', () => ({
+  getConnectionConfig: vi.fn().mockResolvedValue({ connection_username: '', server_url: '' }),
+  connectWebDav: vi.fn(),
+}))
+
+import CloudCredentialModal from '../CloudCredentialModal.vue'
+
+const globalStubs = {
+  AppIcon: true,
+}
+
+const testProvider = { key: 'webdav', label: 'WebDAV' }
+
+beforeEach(() => {
+  setActivePinia(createPinia())
+  vi.clearAllMocks()
+})
+
+describe('RESP-04: CloudCredentialModal mobile-safe panel', () => {
+  it('panel has max-h-[90vh] class for mobile scroll safety', () => {
+    const wrapper = mount(CloudCredentialModal, {
+      props: { show: true, provider: testProvider, existing: null },
+      global: { stubs: globalStubs },
+    })
+    const panel = wrapper.find('[data-test="cloud-credential-modal-panel"]')
+    expect(panel.exists()).toBe(true)
+    expect(panel.classes()).toContain('max-h-[90vh]')
+  })
+
+  it('panel has overflow-y-auto class for mobile scroll', () => {
+    const wrapper = mount(CloudCredentialModal, {
+      props: { show: true, provider: testProvider, existing: null },
+      global: { stubs: globalStubs },
+    })
+    const panel = wrapper.find('[data-test="cloud-credential-modal-panel"]')
+    expect(panel.classes()).toContain('overflow-y-auto')
+  })
+
+  it('panel not rendered when show=false', () => {
+    const wrapper = mount(CloudCredentialModal, {
+      props: { show: false, provider: testProvider, existing: null },
+      global: { stubs: globalStubs },
+    })
+    // When show=false the v-if hides the entire overlay
+    const panel = wrapper.find('[data-test="cloud-credential-modal-panel"]')
+    expect(panel.exists()).toBe(false)
+  })
+})
diff --git a/frontend/src/components/documents/DocumentPreviewModal.vue b/frontend/src/components/documents/DocumentPreviewModal.vue
index 903d3df..0699569 100644
--- a/frontend/src/components/documents/DocumentPreviewModal.vue
+++ b/frontend/src/components/documents/DocumentPreviewModal.vue
@@ -2,6 +2,7 @@
   <!-- Overlay -->
   <div
     ref="overlayRef"
+    data-test="document-preview-modal"
     class="fixed inset-0 bg-black/60 z-50 flex flex-col"
     role="dialog"
     aria-modal="true"
@@ -9,7 +10,7 @@
     @click="handleOverlayClick"
   >
     <!-- Header bar -->
-    <div class="bg-white border-b border-gray-200 px-6 py-3 flex items-center justify-between shrink-0">
+    <div data-test="preview-modal-header" class="bg-white border-b border-gray-200 px-4 sm:px-6 py-3 flex items-center justify-between shrink-0">
       <span class="text-sm font-medium text-gray-900 truncate max-w-xs">{{ doc.filename || doc.original_name }}</span>
       <button
         @click="emit('close')"
diff --git a/frontend/src/components/documents/__tests__/DocumentPreviewModal.mobile.test.js b/frontend/src/components/documents/__tests__/DocumentPreviewModal.mobile.test.js
new file mode 100644
index 0000000..41381dc
--- /dev/null
+++ b/frontend/src/components/documents/__tests__/DocumentPreviewModal.mobile.test.js
@@ -0,0 +1,58 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { mount } from '@vue/test-utils'
+
+vi.mock('../../../api/client.js', () => ({
+  fetchDocumentContent: vi.fn().mockResolvedValue({ ok: true, blob: () => Promise.resolve(new Blob()) }),
+}))
+
+import DocumentPreviewModal from '../DocumentPreviewModal.vue'
+
+const globalStubs = {
+  AppIcon: true,
+}
+
+const testDoc = { id: 'doc-1', filename: 'test.pdf', original_name: 'test.pdf' }
+
+beforeEach(() => {
+  vi.clearAllMocks()
+  // Mock URL.createObjectURL since it's not available in jsdom
+  vi.stubGlobal('URL', {
+    createObjectURL: vi.fn().mockReturnValue('blob:mock-url'),
+    revokeObjectURL: vi.fn(),
+  })
+})
+
+describe('RESP-04: DocumentPreviewModal mobile-safe sizing', () => {
+  it('renders full-screen overlay (fixed inset-0)', () => {
+    const wrapper = mount(DocumentPreviewModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    const overlay = wrapper.find('[data-test="document-preview-modal"]')
+    expect(overlay.exists()).toBe(true)
+    expect(overlay.classes()).toContain('fixed')
+    expect(overlay.classes()).toContain('inset-0')
+  })
+
+  it('header has responsive horizontal padding (px-4 at mobile, sm:px-6 at >=640px)', () => {
+    const wrapper = mount(DocumentPreviewModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    const header = wrapper.find('[data-test="preview-modal-header"]')
+    expect(header.exists()).toBe(true)
+    expect(header.classes()).toContain('px-4')
+    expect(header.classes()).toContain('sm:px-6')
+  })
+
+  it('header filename is truncated with truncate class to prevent overflow', () => {
+    const wrapper = mount(DocumentPreviewModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    const header = wrapper.find('[data-test="preview-modal-header"]')
+    // The filename span should have truncate class
+    const filenameSpan = header.find('span.truncate')
+    expect(filenameSpan.exists()).toBe(true)
+  })
+})
diff --git a/frontend/src/components/folders/FolderDeleteModal.vue b/frontend/src/components/folders/FolderDeleteModal.vue
index 2e8b4ac..52176d7 100644
--- a/frontend/src/components/folders/FolderDeleteModal.vue
+++ b/frontend/src/components/folders/FolderDeleteModal.vue
@@ -9,7 +9,8 @@
       role="dialog"
       aria-modal="true"
       aria-labelledby="delete-modal-title"
-      class="bg-white rounded-2xl shadow-xl p-6 max-w-md w-full mx-4"
+      data-test="folder-delete-modal-panel"
+      class="bg-white rounded-2xl shadow-xl p-6 max-w-md w-full mx-4 max-h-[90vh] overflow-y-auto"
     >
       <!-- Warning icon -->
       <div class="flex justify-center">
diff --git a/frontend/src/components/folders/__tests__/FolderDeleteModal.mobile.test.js b/frontend/src/components/folders/__tests__/FolderDeleteModal.mobile.test.js
new file mode 100644
index 0000000..e45dcc3
--- /dev/null
+++ b/frontend/src/components/folders/__tests__/FolderDeleteModal.mobile.test.js
@@ -0,0 +1,49 @@
+import { describe, it, expect, vi } from 'vitest'
+import { mount } from '@vue/test-utils'
+
+import FolderDeleteModal from '../FolderDeleteModal.vue'
+
+const globalStubs = {
+  AppIcon: true,
+}
+
+const testFolder = { id: 'f1', name: 'Projects', doc_count: 3 }
+
+describe('RESP-04: FolderDeleteModal mobile-safe panel', () => {
+  it('panel has max-h-[90vh] class for mobile scroll safety', () => {
+    const wrapper = mount(FolderDeleteModal, {
+      props: { folder: testFolder },
+      global: { stubs: globalStubs },
+    })
+    const panel = wrapper.find('[data-test="folder-delete-modal-panel"]')
+    expect(panel.exists()).toBe(true)
+    expect(panel.classes()).toContain('max-h-[90vh]')
+  })
+
+  it('panel has overflow-y-auto class for mobile scroll', () => {
+    const wrapper = mount(FolderDeleteModal, {
+      props: { folder: testFolder },
+      global: { stubs: globalStubs },
+    })
+    const panel = wrapper.find('[data-test="folder-delete-modal-panel"]')
+    expect(panel.classes()).toContain('overflow-y-auto')
+  })
+
+  it('panel has mx-4 horizontal margin so it fits within 375px viewport', () => {
+    const wrapper = mount(FolderDeleteModal, {
+      props: { folder: testFolder },
+      global: { stubs: globalStubs },
+    })
+    const panel = wrapper.find('[data-test="folder-delete-modal-panel"]')
+    expect(panel.classes()).toContain('mx-4')
+  })
+
+  it('confirm and cancel buttons are accessible (text, role)', () => {
+    const wrapper = mount(FolderDeleteModal, {
+      props: { folder: testFolder },
+      global: { stubs: globalStubs },
+    })
+    expect(wrapper.text()).toContain('Keep folder')
+    expect(wrapper.text()).toContain('Delete folder and documents')
+  })
+})
diff --git a/frontend/src/components/sharing/ShareModal.vue b/frontend/src/components/sharing/ShareModal.vue
index b2fb4e4..6eebd0f 100644
--- a/frontend/src/components/sharing/ShareModal.vue
+++ b/frontend/src/components/sharing/ShareModal.vue
@@ -9,7 +9,8 @@
       role="dialog"
       aria-modal="true"
       aria-labelledby="share-modal-title"
-      class="bg-white rounded-2xl shadow-xl p-6 max-w-md w-full mx-4 relative"
+      data-test="share-modal-panel"
+      class="bg-white rounded-2xl shadow-xl p-6 max-w-md w-full mx-4 relative max-h-[90vh] overflow-y-auto"
     >
       <!-- Close button -->
       <button
diff --git a/frontend/src/components/sharing/__tests__/ShareModal.mobile.test.js b/frontend/src/components/sharing/__tests__/ShareModal.mobile.test.js
new file mode 100644
index 0000000..e3f00c1
--- /dev/null
+++ b/frontend/src/components/sharing/__tests__/ShareModal.mobile.test.js
@@ -0,0 +1,89 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { mount, flushPromises } from '@vue/test-utils'
+import { createPinia, setActivePinia } from 'pinia'
+
+// Mock stores and API so mount doesn't error out
+vi.mock('../../../stores/documents.js', () => ({
+  useDocumentsStore: () => ({
+    listShares: vi.fn().mockResolvedValue([]),
+    shareDocument: vi.fn(),
+    updateSharePermission: vi.fn(),
+    revokeShare: vi.fn(),
+  }),
+}))
+
+vi.mock('../../../stores/toast.js', () => ({
+  useToastStore: () => ({ show: vi.fn() }),
+}))
+
+import ShareModal from '../ShareModal.vue'
+
+const globalStubs = {
+  AppIcon: true,
+}
+
+const testDoc = { id: 'doc-1', original_name: 'test.pdf' }
+
+beforeEach(() => {
+  setActivePinia(createPinia())
+  vi.clearAllMocks()
+})
+
+describe('VISUAL-02: ShareModal form baseline (@tailwindcss/forms consistent pattern)', () => {
+  it('text input uses consistent ring-2 focus class pattern', async () => {
+    const wrapper = mount(ShareModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    await flushPromises()
+    const input = wrapper.find('input[type="text"]')
+    expect(input.exists()).toBe(true)
+    expect(input.classes()).toContain('focus:ring-2')
+    expect(input.classes()).toContain('focus:outline-none')
+  })
+
+  it('select uses consistent ring-2 focus class pattern', async () => {
+    const wrapper = mount(ShareModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    await flushPromises()
+    const select = wrapper.find('select')
+    expect(select.exists()).toBe(true)
+    expect(select.classes()).toContain('focus:ring-2')
+    expect(select.classes()).toContain('focus:outline-none')
+  })
+})
+
+describe('RESP-04: ShareModal mobile-safe panel', () => {
+  it('panel has max-h-[90vh] class for mobile scroll safety', async () => {
+    const wrapper = mount(ShareModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    await flushPromises()
+    const panel = wrapper.find('[data-test="share-modal-panel"]')
+    expect(panel.exists()).toBe(true)
+    expect(panel.classes()).toContain('max-h-[90vh]')
+  })
+
+  it('panel has overflow-y-auto class for mobile scroll', async () => {
+    const wrapper = mount(ShareModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    await flushPromises()
+    const panel = wrapper.find('[data-test="share-modal-panel"]')
+    expect(panel.classes()).toContain('overflow-y-auto')
+  })
+
+  it('panel has mx-4 horizontal margin so it fits within 375px viewport', async () => {
+    const wrapper = mount(ShareModal, {
+      props: { doc: testDoc },
+      global: { stubs: globalStubs },
+    })
+    await flushPromises()
+    const panel = wrapper.find('[data-test="share-modal-panel"]')
+    expect(panel.classes()).toContain('mx-4')
+  })
+})
diff --git a/frontend/src/views/DocumentView.vue b/frontend/src/views/DocumentView.vue
index f4619c2..84fe3e0 100644
--- a/frontend/src/views/DocumentView.vue
+++ b/frontend/src/views/DocumentView.vue
@@ -119,7 +119,8 @@
         role="dialog"
         aria-modal="true"
         aria-labelledby="cloud-delete-modal-title"
-        class="bg-white rounded-2xl shadow-xl p-6 max-w-sm w-full mx-4"
+        data-test="cloud-delete-modal-panel"
+        class="bg-white rounded-2xl shadow-xl p-6 max-w-sm w-full mx-4 max-h-[90vh] overflow-y-auto"
       >
         <div class="flex items-center gap-2 mb-2">
           <AppIcon name="warning" class="w-5 h-5 text-amber-500 shrink-0" />