Merge pull request 'Implement: US: Mobile Book Search and Discovery' (#24) from feature/mobile-search-discovery into main

Reviewed-on: #24
Reviewed-by: crisleo94 <cristhian.reinoso@codescripters.org>

README.md

@@ -14,7 +14,7 @@ cloud-reader/
 │   │   └── annotations/ # Bookmarks and notes
 │   ├── manage.py
 │   └── requirements.txt
-├── frontend/        # React + Vite + TypeScript (canonical frontend)
+├── frontend/        # React + Vite + TypeScript (web frontend)
 │   ├── src/
 │   │   ├── api/         # API client (axios with JWT refresh)
 │   │   ├── components/  # Reusable components
@@ -23,6 +23,23 @@ cloud-reader/
 │   │   ├── pages/       # Route pages (Library, Reader, AddBook, Auth, Settings)
 │   │   └── types/       # TypeScript type definitions
 │   └── package.json
+├── mobile/          # Expo React Native app (mobile frontend)
+│   ├── src/
+│   │   ├── api/         # API client (axios with JWT refresh via AsyncStorage)
+│   │   ├── components/  # Reusable UI components
+│   │   ├── context/     # Auth context
+│   │   ├── hooks/       # Custom hooks
+│   │   ├── navigation/  # React Navigation (Auth stack + Main tabs)
+│   │   ├── screens/     # Screen-level components (Login, Library, etc.)
+│   │   └── types/       # Mobile-specific types
+│   ├── App.tsx
+│   └── app.json
+├── packages/
+│   └── shared/       # @cloud-reader/shared — domain types & utilities
+│       └── src/
+│           ├── types.ts   # Shared domain types (Book, User, Bookmark, Note, etc.)
+│           └── utils.ts   # Date formatting, validation, API endpoint constants
+├── package.json      # Root — yarn workspaces config
 └── docker-compose.yml
 ```
 
@@ -50,8 +67,24 @@ yarn install
 yarn dev
 ```
 
+### Mobile (Expo)
+```bash
+# From monorepo root — installs all workspaces including mobile
+yarn install
+
+# Start Expo dev server
+yarn workspace @cloud-reader/mobile start
+
+# Or cd into mobile and run directly
+cd mobile
+npx expo start
+```
+
+> The mobile app requires the backend to be running. Set `EXPO_PUBLIC_API_URL` environment variable in your shell or `.env` file to point to the backend (defaults to `http://10.0.2.2:8000` for Android emulator).
+
 ## Migration Notes
 Consolidated from duplicate `api/` + `web/` into single `backend/` + `frontend/` canonical structure.
 - `backend/` kept as canonical; `api/` features (e-book uploads, reading progress, reading settings) merged in.
 - `frontend/` kept as canonical; `web/` pages (Library, Reader, AddBook, Auth, Settings) merged in.
 - `api/` and `web/` directories removed.
+- `mobile/` added as Expo React Native app with shared `@cloud-reader/shared` package.

backend/apps/books/tests.py

@@ -0,0 +1,255 @@
+"""Tests for the Book search & discovery endpoints."""
+
+import pytest
+from django.urls import reverse
+from rest_framework import status
+from rest_framework.test import APIClient
+
+from apps.books.models import Book, ReadingStatus
+
+
+# ---------------------------------------------------------------------------
+# Fixtures
+# ---------------------------------------------------------------------------
+
+
+@pytest.fixture
+def api_client():
+    return APIClient()
+
+
+@pytest.fixture
+def user(django_user_model):
+    return django_user_model.objects.create_user(
+        email="reader@example.com",
+        password="testpass123",
+    )
+
+
+@pytest.fixture
+def auth_client(api_client, user):
+    api_client.force_authenticate(user=user)
+    return api_client
+
+
+@pytest.fixture
+def books():
+    books_data = [
+        Book.objects.create(
+            title="Dune",
+            author="Frank Herbert",
+            genre="Science Fiction",
+            reading_status=ReadingStatus.FINISHED,
+            total_pages=688,
+            description="A desert planet saga.",
+        ),
+        Book.objects.create(
+            title="Neuromancer",
+            author="William Gibson",
+            genre="Science Fiction",
+            reading_status=ReadingStatus.READING,
+            total_pages=271,
+            description="Cyberpunk classic.",
+        ),
+        Book.objects.create(
+            title="The Hobbit",
+            author="J.R.R. Tolkien",
+            genre="Fantasy",
+            reading_status=ReadingStatus.WANT_TO_READ,
+            total_pages=310,
+            description="A hobbit's adventure.",
+        ),
+        Book.objects.create(
+            title="1984",
+            author="George Orwell",
+            genre="Dystopian",
+            reading_status=ReadingStatus.FINISHED,
+            total_pages=328,
+            description="Big Brother is watching.",
+        ),
+    ]
+    return books_data
+
+
+# ---------------------------------------------------------------------------
+# Search tests
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.django_db
+class TestBookSearch:
+    """Verify the search endpoint returns correct results."""
+
+    def test_search_by_title(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "Dune"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "Dune" in titles
+        assert "Neuromancer" not in titles
+
+    def test_search_by_author(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "Tolkien"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "The Hobbit" in titles
+
+    def test_search_by_genre(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "Fantasy"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "The Hobbit" in titles
+
+    def test_search_case_insensitive(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "dune"})
+        assert response.status_code == status.HTTP_200_OK
+        assert any(b["title"] == "Dune" for b in response.data["results"])
+
+    def test_search_partial_match(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "Neu"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "Neuromancer" in titles
+
+    def test_search_empty_query_returns_all(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": ""})
+        assert response.status_code == status.HTTP_200_OK
+        assert len(response.data["results"]) == 4
+
+    def test_search_no_results(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "zzzznotfound"})
+        assert response.status_code == status.HTTP_200_OK
+        assert len(response.data["results"]) == 0
+
+
+# ---------------------------------------------------------------------------
+# Filter tests
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.django_db
+class TestBookFilters:
+    """Verify filters for genre, author, and reading_status."""
+
+    def test_filter_by_genre(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"genre": "Science Fiction"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "Dune" in titles
+        assert "Neuromancer" in titles
+        assert "The Hobbit" not in titles
+
+    def test_filter_by_author(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"author": "George Orwell"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "1984" in titles
+        assert "Dune" not in titles
+
+    def test_filter_by_reading_status(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"reading_status": ReadingStatus.FINISHED})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "Dune" in titles
+        assert "1984" in titles
+        assert "Neuromancer" not in titles
+        assert "The Hobbit" not in titles
+
+    def test_filter_combined_with_search(self, auth_client, books):
+        """Search + filter should intersect results."""
+        url = reverse("book-list")
+        response = auth_client.get(url, {"q": "Dune", "reading_status": ReadingStatus.FINISHED})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert "Dune" in titles
+        # 1984 matches reading_status but not search
+        assert "1984" not in titles
+
+
+# ---------------------------------------------------------------------------
+# Discovery endpoints
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.django_db
+class TestBookDiscovery:
+    """Verify genre and author discovery endpoints."""
+
+    def test_genres_endpoint(self, auth_client, books):
+        url = reverse("book-genres")
+        response = auth_client.get(url)
+        assert response.status_code == status.HTTP_200_OK
+        assert isinstance(response.data, list)
+        assert "Science Fiction" in response.data
+        assert "Fantasy" in response.data
+        assert "Dystopian" in response.data
+        # No duplicate genres
+        assert response.data.count("Science Fiction") == 1
+
+    def test_authors_endpoint(self, auth_client, books):
+        url = reverse("book-authors")
+        response = auth_client.get(url)
+        assert response.status_code == status.HTTP_200_OK
+        assert isinstance(response.data, list)
+        assert "Frank Herbert" in response.data
+        assert "J.R.R. Tolkien" in response.data
+
+    def test_genres_requires_auth(self, api_client, books):
+        url = reverse("book-genres")
+        response = api_client.get(url)
+        assert response.status_code == status.HTTP_401_UNAUTHORIZED
+
+    def test_authors_requires_auth(self, api_client, books):
+        url = reverse("book-authors")
+        response = api_client.get(url)
+        assert response.status_code == status.HTTP_401_UNAUTHORIZED
+
+
+# ---------------------------------------------------------------------------
+# Detail view
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.django_db
+class TestBookDetail:
+    """Verify the book detail endpoint."""
+
+    def test_retrieve_book(self, auth_client, books):
+        book = books[0]
+        url = reverse("book-detail", kwargs={"pk": book.pk})
+        response = auth_client.get(url)
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data["title"] == "Dune"
+        assert response.data["author"] == "Frank Herbert"
+        assert response.data["description"] == "A desert planet saga."
+        assert response.data["total_pages"] == 688
+
+    def test_retrieve_nonexistent_returns_404(self, auth_client, books):
+        url = reverse("book-detail", kwargs={"pk": 99999})
+        response = auth_client.get(url)
+        assert response.status_code == status.HTTP_404_NOT_FOUND
+
+    def test_pagination(self, auth_client, books):
+        """List with small page size should paginate."""
+        url = reverse("book-list")
+        response = auth_client.get(f"{url}?page_size=2")
+        assert response.status_code == status.HTTP_200_OK
+        assert "count" in response.data
+        assert "results" in response.data
+        assert response.data["count"] == 4
+
+    def test_ordering(self, auth_client, books):
+        url = reverse("book-list")
+        response = auth_client.get(url, {"ordering": "title"})
+        assert response.status_code == status.HTTP_200_OK
+        titles = [b["title"] for b in response.data["results"]]
+        assert titles == sorted(titles)

backend/apps/books/views.py

@@ -1,3 +1,6 @@
+from __future__ import annotations
+
+import logging
 from typing import Any
 
 from django.db.models import QuerySet, Q
@@ -9,13 +12,16 @@ from rest_framework.permissions import AllowAny, IsAuthenticated
 from rest_framework.request import Request
 from rest_framework.response import Response
 
-from apps.books.models import Book, EBook, ReadingProgress, ReadingSettings
+from apps.books.models import Book, BookChapter, EBook, ReadingProgress, ReadingSettings
 from apps.books.serializers import (
     BookDetailSerializer, BookListSerializer, BookSerializer,
-    EBookDetailSerializer, EBookListSerializer, EBookUploadSerializer,
+    BookChapterSerializer, EBookContentSerializer, EBookDetailSerializer,
+    EBookListSerializer, EBookTocSerializer, EBookUploadSerializer,
     ReadingProgressSerializer, ReadingSettingsSerializer,
 )
 
+logger = logging.getLogger(__name__)
+
 
 class BookViewSet(viewsets.ModelViewSet):
     queryset = Book.objects.all()
@@ -63,8 +69,10 @@ class EBookViewSet(viewsets.ModelViewSet):
     def get_serializer_class(self):
         if self.action == "create":
             return EBookUploadSerializer
-        if self.action == "list":
+        if self.action in ("list",):
             return EBookListSerializer
+        if self.action in ("toc",):
+            return BookChapterSerializer
         return EBookDetailSerializer
 
     def get_queryset(self):
@@ -82,6 +90,135 @@ class EBookViewSet(viewsets.ModelViewSet):
         serializer.save()
         return Response(serializer.data)
 
+    @action(detail=True, methods=["post"])
+    def process(self, request: Request, pk: int | None = None) -> Response:
+        """Trigger e-book processing: metadata extraction, TOC building, page counting."""
+        ebook = self.get_object()
+        if not ebook.file:
+            return Response({"error": "No file found for this e-book."}, status=status.HTTP_400_BAD_REQUEST)
+
+        try:
+            from apps.books.services import process_ebook
+
+            file_path = ebook.file.path
+            result = process_ebook(file_path, original_filename=ebook.filename())
+
+            # Update ebook with extracted data
+            ebook.format = result.get("format", ebook.format)
+            ebook.page_count = result.get("page_count", 0)
+            ebook.metadata_json = result.get("metadata", {})
+            ebook.save(update_fields=["format", "page_count", "metadata_json", "updated_at"])
+
+            # Store chapters in DB
+            raw_toc: list[dict[str, Any]] = result.get("toc", [])
+            BookChapter.objects.filter(ebook=ebook).delete()
+            _store_chapters(ebook, raw_toc)
+
+            return Response({
+                "format": ebook.format,
+                "page_count": ebook.page_count,
+                "metadata": ebook.metadata_json,
+                "toc_count": len(raw_toc),
+                "status": "processed",
+            })
+        except Exception as exc:
+            logger.exception("Failed to process ebook %s", ebook.id)
+            return Response({"error": f"Processing failed: {exc}"}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
+    @action(detail=True, methods=["get"])
+    def toc(self, request: Request, pk: int | None = None) -> Response:
+        """Return hierarchical table of contents."""
+        ebook = self.get_object()
+        chapters = BookChapter.objects.filter(ebook=ebook).order_by("index").select_related("ebook")
+        serializer = BookChapterSerializer(chapters, many=True)
+        return Response({
+            "chapters": serializer.data,
+            "format": ebook.format,
+            "page_count": ebook.page_count,
+        })
+
+    @action(detail=True, methods=["get"])
+    def content(self, request: Request, pk: int | None = None) -> Response:
+        """Return paginated content for a given page number.
+
+        Query params:
+            page (int): page/chapter index to fetch (1-indexed, default: 1)
+        """
+        ebook = self.get_object()
+        page = max(1, int(request.query_params.get("page", 1)))
+
+        chapters = list(BookChapter.objects.filter(ebook=ebook).order_by("index").select_related("ebook"))
+        total_pages = len(chapters) or ebook.page_count or 1
+
+        chapter: BookChapter | None = None
+        chapter_title = ""
+        content_html = ""
+
+        if chapters and 0 <= page - 1 < len(chapters):
+            ch = chapters[page - 1]
+            chapter_title = ch.title
+            content_html = _fetch_chapter_content(ebook, ch)
+
+        serializer = EBookContentSerializer(data={
+            "page": page,
+            "total_pages": total_pages,
+            "content": content_html,
+            "chapter_title": chapter_title,
+            "format": ebook.format,
+        })
+        serializer.is_valid(raise_exception=True)
+        return Response(serializer.data)
+
+
+def _store_chapters(ebook: EBook, toc: list[dict[str, Any]], parent_index: int = 0) -> None:
+    """Recursively store TOC entries as BookChapter records."""
+    for idx, entry in enumerate(toc):
+        BookChapter.objects.create(
+            ebook=ebook,
+            title=entry.get("title", "Untitled"),
+            index=parent_index + idx,
+            href=entry.get("href", ""),
+            children=entry.get("children", []),
+        )
+        children = entry.get("children", [])
+        if children:
+            _store_chapters(ebook, children, parent_index + idx + 1)
+
+
+def _fetch_chapter_content(ebook: EBook, chapter: BookChapter) -> str:
+    """Fetch HTML content for a chapter from the e-book file."""
+    if ebook.format == "epub":
+        return _fetch_epub_chapter_content(ebook.file.path, chapter)
+    return ""
+
+
+def _fetch_epub_chapter_content(file_path: str, chapter: BookChapter) -> str:
+    """Extract HTML content of a specific EPUB chapter by href."""
+    try:
+        from ebooklib import epub
+        from bs4 import BeautifulSoup
+    except ImportError:
+        return ""
+
+    try:
+        book = epub.read_epub(file_path)
+        href = chapter.href or ""
+        # Find the item by href
+        for item in book.get_items():
+            item_name = item.get_name() or ""
+            if href and (item_name.endswith(href) or href.endswith(item_name)):
+                content = item.get_content()
+                soup = BeautifulSoup(content, "html.parser")
+                # Clean up — remove body/html/head wrappers, keep inner content
+                body = soup.find("body")
+                if body:
+                    return str(body)
+                return str(soup)
+        return ""
+    except Exception:
+        logger.exception("Failed to fetch EPUB chapter content for %s", chapter.href)
+        return ""
+
 
 class ReadingSettingsViewSet(viewsets.GenericViewSet):
     permission_classes = [IsAuthenticated]

docs/backend/009-expo-integration.md

@@ -0,0 +1,96 @@
+# 009 — Expo Mobile Application Integration
+
+**Issue:** #16
+**Status:** Draft
+**Created:** 2026-05-29
+
+## Objective
+
+Integrate an Expo-based React Native mobile application into the `cloud-reader` monorepo, sharing types, API client patterns, and configuration with the existing web frontend.
+
+## Directory Structure
+
+```
+cloud-reader/
+├── mobile/                    # Expo React Native app
+│   ├── package.json
+│   ├── app.json
+│   ├── tsconfig.json
+│   ├── babel.config.js
+│   ├── App.tsx               # Root component
+│   ├── src/
+│   │   ├── api/              # API client (mirrors frontend/src/api/ pattern)
+│   │   │   ├── client.ts     # Axios instance + JWT interceptor
+│   │   │   ├── books.ts      # Book API calls
+│   │   │   └── annotations.ts
+│   │   ├── screens/          # Screen-level components
+│   │   ├── components/       # Reusable UI components
+│   │   ├── navigation/       # React Navigation setup
+│   │   ├── context/          # Auth context, etc.
+│   │   ├── hooks/            # Custom hooks
+│   │   └── types/            # Mobile-specific types
+│   └── assets/
+├── packages/
+│   └── shared/
+│       ├── package.json
+│       ├── tsconfig.json
+│       └── src/
+│           ├── types.ts      # Shared domain types (Book, User, Bookmark, Note)
+│           └── utils.ts      # Shared utility functions
+└── package.json              # Root — updated workspace config
+```
+
+## Monorepo Workspace Config
+
+Root `package.json` workspaces array updated to include `"mobile"`, `"packages/shared"` alongside existing `"frontend"` and `"backend"`.
+
+## Shared `packages/shared`
+
+- `@cloud-reader/shared` package published within the monorepo
+- Exports:
+  - All domain types (`Book`, `BookSummary`, `Bookmark`, `Note`, `User`, `AnnotationEntry`, `PaginatedResponse`, `TokenResponse`)
+  - API endpoint constants
+  - Date formatting helpers
+  - Validation utilities (email regex, password strength check)
+
+## Mobile App Structure
+
+### API Client (`mobile/src/api/client.ts`)
+- Axios instance configured with:
+  - Base URL from environment variable (`EXPO_PUBLIC_API_URL`)
+  - JWT token attachment via request interceptor
+  - Token refresh response interceptor on 401
+  - Uses `AsyncStorage` for token persistence (instead of `localStorage`)
+
+### Navigation (`mobile/src/navigation/`)
+- React Navigation stack:
+  1. `AuthStack` — Login, Register screens
+  2. `MainTabs` — Library, Search, Settings tabs
+  3. `BookReader` — Full-screen reading view
+
+### Key Screens
+| Screen | Route | Purpose |
+|--------|-------|---------|
+| Login | `Auth/Login` | Email/password login |
+| Register | `Auth/Register` | User registration |
+| Library | `Main/Library` | Book list with filtering |
+| BookDetail | `Main/BookDetail` | Book metadata + actions |
+| Reader | `Reader/View` | EPUB/PDF rendering |
+| Search | `Main/Search` | Book discovery |
+| Settings | `Main/Settings` | Profile, theme, download mgmt |
+
+## Backend Changes Required
+
+None. The existing Django REST API already serves all endpoints needed by the mobile app. The mobile app communicates with the same backend via the shared API base URL.
+
+## Docker
+
+No changes to `docker-compose.yml` needed — the mobile app runs on-device or via Expo Go, not inside Docker.
+
+## CI/CD Considerations
+
+The monorepo structure supports a single pipeline that can:
+- `yarn install` at root (installs all workspaces)
+- `yarn workspace @cloud-reader/shared build`
+- `yarn workspace @cloud-reader/mobile build` (Expo EAS for mobile builds)
+- `yarn workspace @cloud-reader/frontend build` (Vite for web builds)

docs/backend/search-discovery-spec.md

@@ -0,0 +1,107 @@
+# Book Search & Discovery — Spec
+
+## Overview
+Enable users to search books within the library and discover new books via filters and a dedicated detail view.
+
+## Backend API Contracts
+
+### Book List & Search
+`GET /api/books/`
+
+**Query Parameters:**
+| Param | Type | Description |
+|-------|------|-------------|
+| `q` | string | Full-text search across title, author, genre |
+| `genre` | string | Exact filter by genre |
+| `author` | string | Exact filter by author |
+| `reading_status` | string | Filter: `want_to_read`, `reading`, `finished`, `dnf` |
+| `ordering` | string | `title`, `author`, `genre`, `created_at` (prefix `-` for desc) |
+| `page` | int | Page number (default: 1) |
+
+**Response (paginated):**
+```json
+{
+  "count": 42,
+  "next": "http://.../?page=2",
+  "previous": null,
+  "results": [
+    {
+      "id": 1,
+      "title": "Dune",
+      "author": "Frank Herbert",
+      "genre": "Science Fiction",
+      "reading_status": "finished",
+      "reading_status_display": "Finished",
+      "cover_image": "https://..."
+    }
+  ]
+}
+```
+
+### Book Detail
+`GET /api/books/{id}/`
+
+**Response:**
+```json
+{
+  "id": 1,
+  "title": "Dune",
+  "author": "Frank Herbert",
+  "genre": "Science Fiction",
+  "description": "...",
+  "reading_status": "finished",
+  "reading_status_display": "Finished",
+  "cover_image": "https://...",
+  "total_pages": 688,
+  "created_at": "2025-01-01T00:00:00Z",
+  "updated_at": "2025-01-15T00:00:00Z"
+}
+```
+
+### Genre / Author Discovery
+`GET /api/books/genres/` → `["Fiction", "Science Fiction", ...]`
+
+`GET /api/books/authors/` → `["Frank Herbert", "Ursula K. Le Guin", ...]`
+
+## Frontend Components
+
+### LibraryPage (enhanced)
+- **Search bar** at top: text input with debounced `onChange` → calls API with `q` param
+- **Filter row**: genre dropdown, author dropdown, reading status dropdown
+  - Genre/Author dropdowns populated from `/api/books/genres/` and `/api/books/authors/`
+  - Reading status uses static enum values (`READING_STATUS_OPTIONS`)
+- **Results grid**: card layout showing cover, title, author, reading status badge
+- **Empty state**: "No books found" with clear message when results are empty
+- **Loading state**: spinner/skeleton while fetching
+- **Click card → navigate to** `/books/{id}`
+
+### BookDetailPage (new)
+- Shows full book info: cover, title, author, genre, description, reading status, total pages
+- Back button to return to library
+- Clean, mobile-responsive layout
+
+### API Client — `frontend/src/api/books.ts`
+
+| Method | Endpoint | Returns |
+|--------|----------|---------|
+| `searchBooks(params)` | `GET /api/books/` | `{count, results: BookListItem[]}` |
+| `getBook(id)` | `GET /api/books/{id}/` | `BookDetail` |
+| `getGenres()` | `GET /api/books/genres/` | `string[]` |
+| `getAuthors()` | `GET /api/books/authors/` | `string[]` |
+
+## Routes (Frontend)
+| Path | Component | Auth |
+|------|-----------|------|
+| `/` | LibraryPage | Protected |
+| `/books/:id` | BookDetailPage | Protected |
+
+## Data Flow
+1. User types in search bar → 300ms debounce → `GET /api/books/?q=...`
+2. User selects filter → `GET /api/books/?genre=...&author=...&reading_status=...`
+3. User clicks result → navigate to `/books/:id`
+4. BookDetailPage → `GET /api/books/{id}/`
+
+## Mobile Optimizations
+- Filters collapse into a toggleable panel on small screens
+- Cards stack in single column on mobile
+- Touch-friendly tap targets (min 44px)

docs/frontend/mobile-search-spec.md

@@ -0,0 +1,99 @@
+# Mobile Book Search & Discovery — Spec
+
+## Overview
+Enhance the existing book search experience with mobile-first features: voice search via the Web Speech API, real-time autocomplete suggestions, and touch-optimized responsive layout.
+
+## Prerequisites
+- Backend endpoints already exist (from `docs/backend/search-discovery-spec.md`):
+  - `GET /api/books/?q=...&genre=...&author=...&reading_status=...` — paginated search
+  - `GET /api/books/{id}/` — book detail
+  - `GET /api/books/genres/` — genre discovery
+  - `GET /api/books/authors/` — author discovery
+- Frontend `LibraryPage` and `BookDetailPage` components exist but lacked API client methods and types (fixed in this PR).
+
+## Frontend API Client Additions
+
+### `frontend/src/types/book.ts` — New exports
+
+```typescript
+export interface BookSearchParams {
+  q?: string;
+  genre?: string;
+  author?: string;
+  reading_status?: string;
+  ordering?: string;
+  page?: number;
+  page_size?: number;
+}
+
+export const READING_STATUS_OPTIONS: { value: string; label: string }[] = [
+  { value: "", label: "All Statuses" },
+  { value: "want_to_read", label: "Want to Read" },
+  { value: "reading", label: "Reading" },
+  { value: "finished", label: "Finished" },
+  { value: "dnf", label: "Did Not Finish" },
+];
+```
+
+### `frontend/src/api/books.ts` — New methods on `booksApi`
+
+| Method | Endpoint | Returns |
+|--------|----------|---------|
+| `searchBooks(params)` | `GET /api/books/` | `{ count, results: BookListItem[] }` |
+| `getBook(id)` | `GET /api/books/{id}/` | `BookDetail` |
+| `getGenres()` | `GET /api/books/genres/` | `string[]` |
+| `getAuthors()` | `GET /api/books/authors/` | `string[]` |
+
+## Mobile Features
+
+### 1. Voice Search
+- **Hook**: `useVoiceSearch` in `frontend/src/hooks/useVoiceSearch.ts`
+- Uses the Web Speech API (`SpeechRecognition` / `webkitSpeechRecognition`)
+- Returns: `{ isListening, transcript, isSupported, startListening, stopListening, hasError }`
+- Renders a microphone icon button next to the search input
+- On mobile, tapping the mic icon triggers the native speech recognition prompt
+- On success, populates the search input with the transcript and triggers a search
+- Graceful degradation: if SpeechRecognition API is unavailable, the mic button is hidden
+
+### 2. Real-Time Suggestions (Autocomplete)
+- Component: `SearchSuggestions` rendered as a dropdown below the search input
+- On each keystroke (debounced 200ms), fetches `GET /api/books/?q=...&page_size=5` for suggestions
+- Shows up to 5 book title/author suggestions in a styled dropdown list
+- Clicking a suggestion navigates directly to `/books/{id}`
+- Clicking outside or pressing Escape dismisses the dropdown
+- Combines with existing full search results — suggestions are fast previews, not the main result list
+
+### 3. Mobile-Responsive Enhancements
+- Filters panel is **collapsed by default** on mobile, toggleable via a "Filters" button
+- Touch targets minimum 44px (WCAG 2.1)
+- Results grid switches to **single column** below 600px viewport width
+- Search input and filters panel stack vertically on small screens
+- Add CSS breakpoints via inline styles and a `useMediaQuery` hook
+- Bottom navigation-style action buttons on mobile (Add Book, Bookmarks, Settings become icon-only)
+
+## Component Hierarchy
+
+```
+LibraryPage
+├── Header (title, count, action buttons)
+├── SearchInput
+│   ├── TextInput (debounced 300ms)
+│   ├── VoiceSearchButton (microphone icon)
+│   └── SearchSuggestions (dropdown, debounced 200ms)
+├── FiltersButton (mobile: toggle; desktop: always visible)
+├── FiltersPanel (collapsible on mobile)
+│   ├── GenreSelect
+│   ├── AuthorSelect
+│   ├── StatusSelect
+│   └── ClearFiltersButton
+├── LoadingState (skeleton grid)
+├── ErrorState (message + retry button)
+├── EmptyState (no results / no books)
+└── ResultsGrid (responsive: auto-fill vs single column)
+```
+
+## Mobile-First CSS Strategy
+- Use inline styles with `@media` queries in a shared `breakpoints.ts` utility
+- Breakpoints: sm = 480px, md = 768px, lg = 1024px
+- Base styles are mobile-first (single column, full width)
+- Media queries expand to multi-column grid and horizontal layout on larger screens

frontend/src/App.tsx

@@ -3,6 +3,7 @@ import { BrowserRouter, Navigate, Route, Routes } from "react-router-dom";
 import { AuthProvider, useAuth } from "./context/AuthContext";
 
 const LibraryPage = lazy(() => import("./pages/Library").then((m) => ({ default: m.LibraryPage })));
+const BookDetailPage = lazy(() => import("./pages/BookDetailPage").then((m) => ({ default: m.BookDetailPage })));
 const ReaderPage = lazy(() => import("./pages/Reader").then((m) => ({ default: m.ReaderPage })));
 const AddBookPage = lazy(() => import("./pages/AddBook").then((m) => ({ default: m.AddBookPage })));
 const SettingsPage = lazy(() => import("./pages/Settings").then((m) => ({ default: m.SettingsPage })));
@@ -35,6 +36,7 @@ function AppRoutes() {
       <Routes>
         <Route path="/auth" element={isAuthenticated ? <Navigate to="/" replace /> : <AuthPage />} />
         <Route path="/" element={<ProtectedRoute><LibraryPage /></ProtectedRoute>} />
+        <Route path="/books/:id" element={<ProtectedRoute><BookDetailPage /></ProtectedRoute>} />
         <Route path="/reader/:id" element={<ProtectedRoute><ReaderPage /></ProtectedRoute>} />
         <Route path="/add" element={<ProtectedRoute><AddBookPage /></ProtectedRoute>} />
         <Route path="/settings" element={<ProtectedRoute><SettingsPage /></ProtectedRoute>} />

frontend/src/api/books.ts

@@ -1,5 +1,15 @@
 import api from "./client";
-import type { EBookDetail, EBookListItem, ReadingProgress, ReadingSettings } from "../types/book";
+import type {
+  BookDetail,
+  BookListItem,
+  BookSearchParams,
+  ContentResponse,
+  EBookDetail,
+  EBookListItem,
+  ReadingProgress,
+  ReadingSettings,
+  TocResponse,
+} from "../types/book";
 
 export const booksApi = {
   async getEBooks(): Promise<EBookListItem[]> {
@@ -7,11 +17,51 @@ export const booksApi = {
     return data;
   },
 
+  async searchBooks(params: BookSearchParams = {}): Promise<{ count: number; results: BookListItem[] }> {
+    const { data } = await api.get<{ count: number; results: BookListItem[] }>("/books/", { params });
+    return data;
+  },
+
+  async getBook(id: number): Promise<BookDetail> {
+    const { data } = await api.get<BookDetail>(`/books/${id}/`);
+    return data;
+  },
+
+  async getGenres(): Promise<string[]> {
+    const { data } = await api.get<string[]>("/books/genres/");
+    return data;
+  },
+
+  async getAuthors(): Promise<string[]> {
+    const { data } = await api.get<string[]>("/books/authors/");
+    return data;
+  },
+
   async getEBook(id: number): Promise<EBookDetail> {
     const { data } = await api.get<EBookDetail>(`/books/ebooks/${id}/`);
     return data;
   },
 
+  async searchBooks(params: BookSearchParams = {}): Promise<{ count: number; results: BookListItem[] }> {
+    const { data } = await api.get<{ count: number; results: BookListItem[] }>("/books/", { params });
+    return data;
+  },
+
+  async getBook(id: number): Promise<BookDetail> {
+    const { data } = await api.get<BookDetail>(`/books/${id}/`);
+    return data;
+  },
+
+  async getGenres(): Promise<string[]> {
+    const { data } = await api.get<string[]>("/books/genres/");
+    return data;
+  },
+
+  async getAuthors(): Promise<string[]> {
+    const { data } = await api.get<string[]>("/books/authors/");
+    return data;
+  },
+
   async uploadEBook(
     file: File,
     title: string,
@@ -34,6 +84,21 @@ export const booksApi = {
     await api.delete(`/books/ebooks/${id}/`);
   },
 
+  async processEBook(id: number): Promise<{ status: string }> {
+    const { data } = await api.post<{ status: string }>(`/books/ebooks/${id}/process/`);
+    return data;
+  },
+
+  async getToc(id: number): Promise<TocResponse> {
+    const { data } = await api.get<TocResponse>(`/books/ebooks/${id}/toc/`);
+    return data;
+  },
+
+  async getContent(id: number, page: number): Promise<ContentResponse> {
+    const { data } = await api.get<ContentResponse>(`/books/ebooks/${id}/content/?page=${page}`);
+    return data;
+  },
+
   async getProgress(ebookId: number): Promise<ReadingProgress> {
     const { data } = await api.get<ReadingProgress>(`/books/ebooks/${ebookId}/progress/`);
     return data;

frontend/src/components/search/SearchSuggestions.module.css

@@ -0,0 +1,65 @@
+.container {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  z-index: 100;
+  background: #fff;
+  border: 1px solid #e5e7eb;
+  border-top: none;
+  border-radius: 0 0 10px 10px;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
+  max-height: 320px;
+  overflow-y: auto;
+}
+
+.infoText {
+  padding: 12px 16px;
+  color: #9ca3af;
+  font-size: 13px;
+}
+
+.suggestionItem {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 10px 16px;
+  cursor: pointer;
+  border-bottom: 1px solid #f3f4f6;
+  min-height: 44px;
+}
+
+.suggestionItem:hover {
+  background: #f9fafb;
+}
+
+.coverImage {
+  width: 32px;
+  height: 48px;
+  object-fit: cover;
+  border-radius: 4px;
+}
+
+.coverPlaceholder {
+  font-size: 20px;
+  flex-shrink: 0;
+}
+
+.bookInfo {
+  min-width: 0;
+}
+
+.bookTitle {
+  font-size: 14px;
+  font-weight: 600;
+  color: #1f2937;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.bookAuthor {
+  font-size: 12px;
+  color: #6b7280;
+  margin-top: 2px;
+}

frontend/src/components/search/SearchSuggestions.tsx

@@ -0,0 +1,120 @@
+import { useEffect, useRef, useState } from "react";
+import { useNavigate } from "react-router-dom";
+import { booksApi } from "../../api/books";
+import { useDebounce } from "../../hooks/useDebounce";
+import type { BookListItem } from "../../types/book";
+import styles from "./SearchSuggestions.module.css";
+
+interface SearchSuggestionsProps {
+  query: string;
+  visible: boolean;
+  onClose: () => void;
+  onSelectSuggestion: () => void;
+}
+
+export function SearchSuggestions({ query, visible, onClose, onSelectSuggestion }: SearchSuggestionsProps) {
+  const navigate = useNavigate();
+  const [suggestions, setSuggestions] = useState<BookListItem[]>([]);
+  const [loading, setLoading] = useState(false);
+  const containerRef = useRef<HTMLDivElement>(null);
+  const debouncedQuery = useDebounce(query, 200);
+
+  useEffect(() => {
+    if (!debouncedQuery.trim()) {
+      setSuggestions([]);
+      return;
+    }
+    let cancelled = false;
+    setLoading(true);
+    void booksApi.searchBooks({ q: debouncedQuery.trim(), page_size: 5 }).then(
+      (res) => {
+        if (!cancelled) {
+          setSuggestions(res.results);
+          setLoading(false);
+        }
+      },
+      () => {
+        if (!cancelled) {
+          setSuggestions([]);
+          setLoading(false);
+        }
+      },
+    );
+    return () => {
+      cancelled = true;
+    };
+  }, [debouncedQuery]);
+
+  // Close on click outside
+  useEffect(() => {
+    if (!visible) return;
+    const handler = (e: MouseEvent) => {
+      if (containerRef.current && !containerRef.current.contains(e.target as Node)) {
+        onClose();
+      }
+    };
+    // Delay attachment to avoid the click that opened us from immediately closing
+    const timer = setTimeout(() => document.addEventListener("click", handler), 0);
+    return () => {
+      clearTimeout(timer);
+      document.removeEventListener("click", handler);
+    };
+  }, [visible, onClose]);
+
+  // Close on Escape
+  useEffect(() => {
+    if (!visible) return;
+    const handler = (e: KeyboardEvent) => {
+      if (e.key === "Escape") onClose();
+    };
+    document.addEventListener("keydown", handler);
+    return () => document.removeEventListener("keydown", handler);
+  }, [visible, onClose]);
+
+  if (!visible || !query.trim()) return null;
+
+  return (
+    <div ref={containerRef} className={styles.container}>
+      {loading && (
+        <div className={styles.infoText}>
+          Searching...
+        </div>
+      )}
+      {!loading && suggestions.length === 0 && debouncedQuery.trim() && (
+        <div className={styles.infoText}>
+          No quick suggestions
+        </div>
+      )}
+      {suggestions.map((book) => (
+        <div
+          key={book.id}
+          className={styles.suggestionItem}
+          onClick={() => {
+            onSelectSuggestion();
+            navigate(`/books/${book.id}`);
+          }}
+        >
+          <span className={styles.coverPlaceholder}>
+            {book.cover_image ? (
+              <img
+                src={book.cover_image}
+                alt=""
+                className={styles.coverImage}
+              />
+            ) : (
+              "📖"
+            )}
+          </span>
+          <div className={styles.bookInfo}>
+            <div className={styles.bookTitle}>
+              {book.title}
+            </div>
+            <div className={styles.bookAuthor}>
+              {book.author || "Unknown Author"}
+            </div>
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}

frontend/src/hooks/index.ts

@@ -1 +1,4 @@
 export { usePaginatedQuery } from "./usePaginatedQuery";
+export { useDebounce } from "./useDebounce";
+export { useVoiceSearch } from "./useVoiceSearch";
+export { useMediaQuery } from "./useMediaQuery";

frontend/src/hooks/useDebounce.ts

@@ -0,0 +1,18 @@
+import { useEffect, useState } from "react";
+
+/**
+ * A hook that debounces a value by the specified delay.
+ * @param value - The value to debounce
+ * @param delay - The delay in milliseconds
+ * @returns The debounced value
+ */
+export function useDebounce<T>(value: T, delay: number): T {
+  const [debounced, setDebounced] = useState(value);
+
+  useEffect(() => {
+    const timer = setTimeout(() => setDebounced(value), delay);
+    return () => clearTimeout(timer);
+  }, [value, delay]);
+
+  return debounced;
+}

frontend/src/hooks/useMediaQuery.ts

@@ -0,0 +1,26 @@
+import { useEffect, useState } from "react";
+
+/**
+ * Hook for responsive design — returns true when the media query matches.
+ * Defaults to false on SSR / initial render to avoid hydration mismatch.
+ */
+export function useMediaQuery(query: string): boolean {
+  const [matches, setMatches] = useState(false);
+
+  useEffect(() => {
+    const mql = window.matchMedia(query);
+    setMatches(mql.matches);
+
+    const handler = (e: MediaQueryListEvent) => setMatches(e.matches);
+    mql.addEventListener("change", handler);
+    return () => mql.removeEventListener("change", handler);
+  }, [query]);
+
+  return matches;
+}
+
+export const BREAKPOINTS = {
+  sm: "(max-width: 480px)",
+  md: "(max-width: 768px)",
+  lg: "(min-width: 1024px)",
+} as const;

frontend/src/hooks/useVoiceSearch.ts

@@ -0,0 +1,105 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+
+export interface UseVoiceSearchResult {
+  isListening: boolean;
+  transcript: string;
+  isSupported: boolean;
+  hasError: boolean;
+  errorMessage: string | null;
+  startListening: () => void;
+  stopListening: () => void;
+}
+
+/**
+ * Hook for voice search using the Web Speech API.
+ * Returns a microphone control interface.
+ * Gracefully degrades when SpeechRecognition is unavailable.
+ */
+export function useVoiceSearch(): UseVoiceSearchResult {
+  const [isListening, setIsListening] = useState(false);
+  const [transcript, setTranscript] = useState("");
+  const [isSupported, setIsSupported] = useState(false);
+  const [hasError, setHasError] = useState(false);
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+
+  const recognitionRef = useRef<SpeechRecognition | null>(null);
+  const mountedRef = useRef(true);
+
+  useEffect(() => {
+    mountedRef.current = true;
+    // Check for SpeechRecognition support (standard + webkit prefix)
+    const SpeechRecognitionCtor =
+      (window as unknown as Record<string, unknown>).SpeechRecognition ??
+      (window as unknown as Record<string, unknown>).webkitSpeechRecognition;
+
+    if (typeof SpeechRecognitionCtor === "function") {
+      setIsSupported(true);
+      const recognition = new (SpeechRecognitionCtor as new () => SpeechRecognition)();
+      recognition.continuous = false;
+      recognition.interimResults = false;
+      recognition.lang = "en-US";
+
+      recognition.onresult = (event: SpeechRecognitionEvent) => {
+        const resultText = event.results[0]?.[0]?.transcript ?? "";
+        if (mountedRef.current) {
+          setTranscript(resultText);
+          setHasError(false);
+          setErrorMessage(null);
+        }
+      };
+
+      recognition.onerror = (event: SpeechRecognitionErrorEvent) => {
+        if (mountedRef.current) {
+          setHasError(true);
+          setErrorMessage(event.error);
+          setIsListening(false);
+        }
+      };
+
+      recognition.onend = () => {
+        if (mountedRef.current) {
+          setIsListening(false);
+        }
+      };
+
+      recognitionRef.current = recognition;
+    }
+
+    return () => {
+      mountedRef.current = false;
+      if (recognitionRef.current) {
+        recognitionRef.current.abort();
+      }
+    };
+  }, []);
+
+  const startListening = useCallback(() => {
+    if (!recognitionRef.current) return;
+    setTranscript("");
+    setHasError(false);
+    setErrorMessage(null);
+    try {
+      recognitionRef.current.start();
+      setIsListening(true);
+    } catch {
+      // May throw if already started
+      setIsListening(false);
+    }
+  }, []);
+
+  const stopListening = useCallback(() => {
+    if (!recognitionRef.current) return;
+    recognitionRef.current.stop();
+    setIsListening(false);
+  }, []);
+
+  return {
+    isListening,
+    transcript,
+    isSupported,
+    hasError,
+    errorMessage,
+    startListening,
+    stopListening,
+  };
+}

frontend/src/pages/BookDetailPage.tsx

@@ -0,0 +1,208 @@
+import React, { useCallback, useEffect, useState } from "react";
+import { useNavigate, useParams } from "react-router-dom";
+import { booksApi } from "../api/books";
+import type { BookDetail } from "../types/book";
+import { useMediaQuery, BREAKPOINTS } from "../hooks/useMediaQuery";
+
+export function BookDetailPage() {
+  const { id } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const [book, setBook] = useState<BookDetail | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const isMobile = useMediaQuery(BREAKPOINTS.md);
+
+  const loadBook = useCallback(async () => {
+    if (!id) return;
+    setLoading(true);
+    setError(null);
+    try {
+      const bookId = Number(id);
+      if (Number.isNaN(bookId)) {
+        setError("Invalid book ID");
+        return;
+      }
+      const data = await booksApi.getBook(bookId);
+      setBook(data);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to load book details");
+    } finally {
+      setLoading(false);
+    }
+  }, [id]);
+
+  useEffect(() => {
+    void loadBook();
+  }, [loadBook]);
+
+  const statusColors: Record<string, { bg: string; text: string }> = {
+    want_to_read: { bg: "#dbeafe", text: "#1d4ed8" },
+    reading: { bg: "#dcfce7", text: "#16a34a" },
+    finished: { bg: "#f3e8ff", text: "#9333ea" },
+    dnf: { bg: "#fef3c7", text: "#b45309" },
+  };
+
+  const containerStyle: React.CSSProperties = {
+    maxWidth: 720,
+    margin: "0 auto",
+    padding: isMobile ? 16 : 24,
+    minHeight: "100vh",
+    background: "#f8f9fa",
+  };
+
+  const backButtonStyle: React.CSSProperties = {
+    display: "inline-flex",
+    alignItems: "center",
+    gap: 4,
+    padding: isMobile ? "10px 16px" : "8px 16px",
+    borderRadius: 8,
+    border: "1px solid #e5e7eb",
+    background: "#fff",
+    color: "#374151",
+    fontSize: isMobile ? 15 : 14,
+    cursor: "pointer",
+    marginBottom: isMobile ? 16 : 24,
+    minHeight: 44,
+  };
+
+  if (loading) {
+    return (
+      <div style={containerStyle}>
+        <div style={{ height: 32, width: 80, background: "#e5e7eb", borderRadius: 6, marginBottom: 24 }} />
+        <div style={{ display: "flex", gap: isMobile ? 16 : 24, flexDirection: isMobile ? "column" : "row" }}>
+          <div style={{
+            width: isMobile ? 140 : 240,
+            height: isMobile ? 210 : 360,
+            background: "#e5e7eb",
+            borderRadius: 12,
+            flexShrink: 0,
+            alignSelf: isMobile ? "center" : "flex-start",
+          }} />
+          <div style={{ flex: 1 }}>
+            <div style={{ height: 28, background: "#e5e7eb", borderRadius: 6, marginBottom: 12, width: "60%" }} />
+            <div style={{ height: 18, background: "#e5e7eb", borderRadius: 4, marginBottom: 8, width: "40%" }} />
+            <div style={{ height: 18, background: "#e5e7eb", borderRadius: 4, marginBottom: 8, width: "30%" }} />
+            <div style={{ height: 14, background: "#e5e7eb", borderRadius: 4, marginBottom: 4, width: "90%" }} />
+            <div style={{ height: 14, background: "#e5e7eb", borderRadius: 4, marginBottom: 4, width: "80%" }} />
+            <div style={{ height: 14, background: "#e5e7eb", borderRadius: 4, width: "70%" }} />
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+  if (error || !book) {
+    return (
+      <div style={containerStyle}>
+        <button onClick={() => navigate("/")} style={backButtonStyle}>← Back to Library</button>
+        <div style={{ textAlign: "center", padding: isMobile ? "60px 16px" : "80px 20px" }}>
+          <div style={{ fontSize: isMobile ? 48 : 64, marginBottom: 16 }}>😕</div>
+          <h2 style={{ fontSize: isMobile ? 18 : 20, color: "#1f2937", marginBottom: 8 }}>Book not found</h2>
+          <p style={{ color: "#6b7280", marginBottom: 20 }}>{error || "The book you're looking for doesn't exist or has been removed."}</p>
+          <button onClick={() => void loadBook()} className="btn" style={{ padding: "12px 24px", fontSize: 15, minHeight: 44 }}>Retry</button>
+        </div>
+      </div>
+    );
+  }
+
+  const sc = statusColors[book.reading_status] ?? { bg: "#f3f4f6", text: "#6b7280" };
+
+  return (
+    <div style={containerStyle}>
+      {/* Back button */}
+      <button onClick={() => navigate("/")} style={backButtonStyle}>
+        ← {isMobile ? "Back" : "Back to Library"}
+      </button>
+
+      {/* Book Detail */}
+      <div style={{ display: "flex", gap: isMobile ? 20 : 32, flexDirection: isMobile ? "column" : "row" }}>
+        {/* Cover */}
+        <div style={{ flexShrink: 0, alignSelf: isMobile ? "center" : "flex-start" }}>
+          <div style={{
+            width: isMobile ? 160 : 240,
+            height: isMobile ? 240 : 360,
+            borderRadius: 12,
+            overflow: "hidden",
+            background: "#f0f0f0",
+            display: "flex",
+            alignItems: "center",
+            justifyContent: "center",
+            boxShadow: "0 4px 20px rgba(0,0,0,0.1)",
+          }}>
+            {book.cover_image
+              ? <img src={book.cover_image} alt={book.title} style={{ width: "100%", height: "100%", objectFit: "cover" }} />
+              : <span style={{ fontSize: isMobile ? 48 : 80 }}>📖</span>}
+          </div>
+        </div>
+
+        {/* Info */}
+        <div style={{ flex: 1, minWidth: 0 }}>
+          <h1 style={{ fontSize: isMobile ? 22 : 28, fontWeight: 700, color: "#1f2937", marginBottom: 8, lineHeight: 1.2 }}>
+            {book.title}
+          </h1>
+
+          {book.author && (
+            <p style={{ fontSize: isMobile ? 16 : 18, color: "#4b5563", marginBottom: 6 }}>
+              by {book.author}
+            </p>
+          )}
+
+          <div style={{ display: "flex", gap: 8, flexWrap: "wrap", marginBottom: 16, marginTop: 12 }}>
+            <span style={{ background: sc.bg, color: sc.text, fontSize: 13, fontWeight: 600, padding: "4px 12px", borderRadius: 999, minHeight: 28, display: "inline-flex", alignItems: "center" }}>
+              {book.reading_status_display}
+            </span>
+            {book.genre && (
+              <span style={{ background: "#eef2ff", color: "#4f46e5", fontSize: 13, padding: "4px 12px", borderRadius: 999, minHeight: 28, display: "inline-flex", alignItems: "center" }}>
+                {book.genre}
+              </span>
+            )}
+            {book.total_pages > 0 && (
+              <span style={{ background: "#f3f4f6", color: "#6b7280", fontSize: 13, padding: "4px 12px", borderRadius: 999, minHeight: 28, display: "inline-flex", alignItems: "center" }}>
+                {book.total_pages} pages
+              </span>
+            )}
+          </div>
+
+          {book.description && (
+            <div style={{ marginTop: 20 }}>
+              <h3 style={{ fontSize: 16, fontWeight: 600, color: "#1f2937", marginBottom: 8 }}>Description</h3>
+              <p style={{ fontSize: isMobile ? 15 : 15, color: "#4b5563", lineHeight: 1.7, whiteSpace: "pre-wrap" }}>
+                {book.description}
+              </p>
+            </div>
+          )}
+
+          <div style={{ marginTop: 24, paddingTop: 16, borderTop: "1px solid #e5e7eb" }}>
+            <p style={{ fontSize: 13, color: "#9ca3af" }}>
+              Added {new Date(book.created_at).toLocaleDateString(undefined, { year: "numeric", month: "long", day: "numeric" })}
+              {book.created_at !== book.updated_at && ` · Updated ${new Date(book.updated_at).toLocaleDateString(undefined, { year: "numeric", month: "long", day: "numeric" })}`}
+            </p>
+          </div>
+
+          {/* Mobile full-width back button */}
+          {isMobile && (
+            <div style={{ marginTop: 24 }}>
+              <button
+                onClick={() => navigate("/")}
+                style={{
+                  width: "100%",
+                  padding: "14px 24px",
+                  borderRadius: 10,
+                  border: "none",
+                  background: "#4f46e5",
+                  color: "#fff",
+                  fontSize: 15,
+                  fontWeight: 600,
+                  cursor: "pointer",
+                  minHeight: 44,
+                }}
+              >
+                ← Back to Library
+              </button>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}

frontend/src/pages/Library.module.css

@@ -0,0 +1,13 @@
+.bookCard {
+  background: #fff;
+  border-radius: 12px;
+  overflow: hidden;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
+  cursor: pointer;
+  transition: transform 0.15s, box-shadow 0.15s;
+}
+
+.bookCard:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
+}

frontend/src/pages/Library.tsx

@@ -1,61 +1,545 @@
-import React, { useCallback, useEffect, useState } from "react";
+import React, { useCallback, useEffect, useRef, useState } from "react";
 import { useNavigate } from "react-router-dom";
 import { booksApi } from "../api/books";
-import type { EBookListItem } from "../types/book";
+import type { BookListItem, BookSearchParams } from "../types/book";
+import { READING_STATUS_OPTIONS } from "../types/book";
 import { useAuth } from "../context/AuthContext";
+import { useDebounce } from "../hooks/useDebounce";
+import { useVoiceSearch } from "../hooks/useVoiceSearch";
+import { useMediaQuery, BREAKPOINTS } from "../hooks/useMediaQuery";
+import { SearchSuggestions } from "../components/search/SearchSuggestions";
+import styles from "./Library.module.css";
+
+interface FilterState {
+  genre: string;
+  author: string;
+  reading_status: string;
+}
+
+/** WCAG 2.1 minimum touch target */
+const TOUCH_TARGET: React.CSSProperties = {
+  minHeight: 44,
+  minWidth: 44,
+  display: "inline-flex",
+  alignItems: "center",
+  justifyContent: "center",
+};
 
 export function LibraryPage() {
-  const [books, setBooks] = useState<EBookListItem[]>([]);
+  const navigate = useNavigate();
+  const { logout } = useAuth();
+
+  const [books, setBooks] = useState<BookListItem[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
-  const { logout } = useAuth();
+  const [searchQuery, setSearchQuery] = useState("");
-  const navigate = useNavigate();
+  const [filters, setFilters] = useState<FilterState>({ genre: "", author: "", reading_status: "" });
+  const [genres, setGenres] = useState<string[]>([]);
+  const [authors, setAuthors] = useState<string[]>([]);
+  const [totalCount, setTotalCount] = useState(0);
+  const [showFilters, setShowFilters] = useState(false);
+  const [showSuggestions, setShowSuggestions] = useState(false);
 
-  const loadBooks = useCallback(async () => {
+  const debouncedSearch = useDebounce(searchQuery, 300);
+  const loadedRef = useRef(false);
+  const searchInputRef = useRef<HTMLInputElement>(null);
+  const isMobile = useMediaQuery(BREAKPOINTS.md);
+
+  // Voice search
+  const voiceSearch = useVoiceSearch();
+
+  // Sync voice transcript into search input
+  useEffect(() => {
+    if (voiceSearch.transcript && !voiceSearch.isListening) {
+      setSearchQuery(voiceSearch.transcript);
+      setShowSuggestions(false);
+    }
+  }, [voiceSearch.transcript, voiceSearch.isListening]);
+
+  // Load filter options once
+  useEffect(() => {
+    if (loadedRef.current) return;
+    loadedRef.current = true;
+    void Promise.all([booksApi.getGenres(), booksApi.getAuthors()]).then(
+      ([genreList, authorList]) => {
+        setGenres(genreList);
+        setAuthors(authorList);
+      },
+      () => {
+        // Filters degrade gracefully if discovery endpoints fail
+      },
+    );
+  }, []);
+
+  const loadBooks = useCallback(async (params: BookSearchParams) => {
     setLoading(true);
     setError(null);
     try {
-      const data = await booksApi.getEBooks();
+      const response = await booksApi.searchBooks(params);
-      setBooks(data);
+      setBooks(response.results);
+      setTotalCount(response.count);
     } catch (err) {
-      setError(err instanceof Error ? err.message : "Failed to load library");
+      setError(err instanceof Error ? err.message : "Failed to load books");
+      setBooks([]);
+      setTotalCount(0);
     } finally {
       setLoading(false);
     }
   }, []);
 
-  useEffect(() => { void loadBooks(); }, [loadBooks]);
+  // Reload when search or filters change
+  useEffect(() => {
+    const params: BookSearchParams = {};
+    if (debouncedSearch) params.q = debouncedSearch;
+    if (filters.genre) params.genre = filters.genre;
+    if (filters.author) params.author = filters.author;
+    if (filters.reading_status) params.reading_status = filters.reading_status;
+    void loadBooks(params);
+  }, [debouncedSearch, filters, loadBooks]);
+
+  const handleFilterChange = (key: keyof FilterState, value: string) => {
+    setFilters((prev: FilterState) => ({ ...prev, [key]: value }));
+  };
+
+  const clearAllFilters = () => {
+    setSearchQuery("");
+    setFilters({ genre: "", author: "", reading_status: "" });
+    setShowFilters(false);
+  };
+
+  const hasActiveFilters = !!searchQuery || !!filters.genre || !!filters.author || !!filters.reading_status;
+
+  const containerStyle: React.CSSProperties = {
+    maxWidth: 960,
+    margin: "0 auto",
+    padding: isMobile ? 12 : 16,
+    minHeight: "100vh",
+    background: "#f8f9fa",
+  };
+
+  const headerStyle: React.CSSProperties = {
+    display: "flex",
+    justifyContent: "space-between",
+    alignItems: "center",
+    marginBottom: isMobile ? 12 : 20,
+    padding: isMobile ? "12px 0" : "16px 0",
+    borderBottom: "1px solid #e5e7eb",
+    flexWrap: "wrap",
+    gap: 8,
+  };
+
+  const searchContainerStyle: React.CSSProperties = {
+    position: "relative",
+    flex: 1,
+  };
 
   return (
-    <div style={{ maxWidth: 800, margin: "0 auto", padding: 16, minHeight: "100vh", background: "#f8f9fa" }}>
+    <div style={containerStyle}>
-      <header style={{ display: "flex", justifyContent: "space-between", alignItems: "center", marginBottom: 24, padding: "16px 0", borderBottom: "1px solid #eee", flexWrap: "wrap", gap: 8 }}>
+      {/* Header */}
-        <h1 style={{ fontSize: 24, fontWeight: 700, color: "#1a1a2e" }}>My Library</h1>
+      <header style={headerStyle}>
-        <div style={{ display: "flex", gap: 8, flexWrap: "wrap" }}>
+        <div>
-          <button onClick={() => navigate("/add")} style={{ padding: "10px 20px", borderRadius: 8, border: "none", background: "#1a1a2e", color: "#fff", fontSize: 14, fontWeight: 600, cursor: "pointer" }}>+ Add Book</button>
+          <h1 style={{ fontSize: isMobile ? 20 : 24, fontWeight: 700, color: "#1f2937", margin: 0 }}>Library</h1>
-          <button onClick={() => navigate("/settings")} style={{ padding: "10px 20px", borderRadius: 8, border: "1px solid #ddd", background: "#fff", color: "#333", fontSize: 14, cursor: "pointer" }}>Settings</button>
+          {!loading && (
-          <button onClick={() => navigate("/bookmarks-notes")} style={{ padding: "10px 20px", borderRadius: 8, border: "1px solid #ddd", background: "#fff", color: "#333", fontSize: 14, cursor: "pointer" }}>Bookmarks</button>
+            <p style={{ fontSize: 13, color: "#6b7280", marginTop: 2 }}>
-          <button onClick={logout} style={{ padding: "10px 20px", borderRadius: 8, border: "1px solid #e74c3c", background: "#fff", color: "#e74c3c", fontSize: 14, cursor: "pointer" }}>Logout</button>
+              {totalCount} book{totalCount !== 1 ? "s" : ""}
+            </p>
+          )}
+        </div>
+        <div style={{ display: "flex", gap: isMobile ? 4 : 8, flexWrap: "wrap", alignItems: "center" }}>
+          {isMobile ? (
+            <>
+              <button onClick={() => navigate("/add")} style={{ ...TOUCH_TARGET, fontSize: 20, background: "none", border: "none", cursor: "pointer", padding: 8 }} title="Add Book">➕</button>
+              <button onClick={() => navigate("/bookmarks-notes")} style={{ ...TOUCH_TARGET, fontSize: 20, background: "none", border: "none", cursor: "pointer", padding: 8 }} title="Bookmarks">🔖</button>
+              <button onClick={() => navigate("/settings")} style={{ ...TOUCH_TARGET, fontSize: 20, background: "none", border: "none", cursor: "pointer", padding: 8 }} title="Settings">⚙️</button>
+              <button onClick={logout} style={{ ...TOUCH_TARGET, fontSize: 20, background: "none", border: "none", cursor: "pointer", padding: 8 }} title="Logout">🚪</button>
+            </>
+          ) : (
+            <>
+              <button onClick={() => navigate("/add")} className="btn">+ Add Book</button>
+              <button onClick={() => navigate("/bookmarks-notes")} className="btn btn-secondary">Bookmarks</button>
+              <button onClick={() => navigate("/settings")} className="btn btn-secondary">Settings</button>
+              <button onClick={logout} className="btn btn-danger">Logout</button>
+            </>
+          )}
         </div>
       </header>
 
-      {error && <div style={{ background: "#fde8e8", padding: 16, borderRadius: 8, marginBottom: 16, textAlign: "center" }}><p>{error}</p><button onClick={loadBooks} style={{ marginTop: 8, padding: "8px 16px", border: "none", borderRadius: 6, background: "#e74c3c", color: "#fff", cursor: "pointer" }}>Retry</button></div>}
+      {/* Search Bar */}
-      {loading && books.length === 0 && <div style={{ textAlign: "center", padding: "60px 20px" }}><p>Loading your library...</p></div>}
+      <div style={{ marginBottom: 16 }}>
-      {!loading && !error && books.length === 0 && <div style={{ textAlign: "center", padding: "60px 20px" }}><p style={{ fontSize: 20, color: "#666", marginBottom: 8 }}>Your library is empty</p><p style={{ color: "#999", marginBottom: 20 }}>Add a book to get started</p><button onClick={() => navigate("/add")} style={{ padding: "10px 20px", borderRadius: 8, border: "none", background: "#1a1a2e", color: "#fff", fontSize: 14, fontWeight: 600, cursor: "pointer" }}>Add Your First Book</button></div>}
+        <div style={{ display: "flex", gap: 8, alignItems: "center" }}>
+          <div style={searchContainerStyle}>
+            <input
+              ref={searchInputRef}
+              type="text"
+              placeholder="Search by title, author, or genre..."
+              value={searchQuery}
+              onChange={(e) => {
+                setSearchQuery(e.target.value);
+                setShowSuggestions(true);
+              }}
+              onFocus={() => setShowSuggestions(true)}
+              style={{
+                width: "100%",
+                padding: `12px 16px 12px ${voiceSearch.isSupported ? 44 : 44}px`,
+                paddingRight: voiceSearch.isSupported ? 48 : 16,
+                borderRadius: 10,
+                border: "1px solid #e5e7eb",
+                fontSize: isMobile ? 16 : 15,
+                background: "#fff",
+                outline: "none",
+                boxSizing: "border-box",
+                minHeight: 44,
+              }}
+            />
+            <span style={{
+              position: "absolute", left: 14, top: "50%", transform: "translateY(-50%)",
+              fontSize: 18, color: "#9ca3af", pointerEvents: "none",
+            }}>🔍</span>
 
-      <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(200px, 1fr))", gap: 16 }}>
+            {/* Voice Search Button */}
-        {books.map((book) => (
+            {voiceSearch.isSupported && (
-          <div key={book.id} onClick={() => navigate(`/reader/${book.id}`)} style={{ background: "#fff", borderRadius: 12, overflow: "hidden", boxShadow: "0 2px 8px rgba(0,0,0,0.06)", cursor: "pointer" }}>
+              <button
-            <div style={{ height: 180, background: "#f0f0f0", display: "flex", alignItems: "center", justifyContent: "center" }}>
+                onClick={() => {
-              {book.cover_image ? <img src={book.cover_image} alt={book.title} style={{ width: "100%", height: "100%", objectFit: "cover" }} /> : <span style={{ fontSize: 48 }}>📖</span>}
+                  if (voiceSearch.isListening) {
+                    voiceSearch.stopListening();
+                  } else {
+                    voiceSearch.startListening();
+                  }
+                }}
+                style={{
+                  position: "absolute",
+                  right: 8,
+                  top: "50%",
+                  transform: "translateY(-50%)",
+                  background: voiceSearch.isListening ? "#dc2626" : "transparent",
+                  border: "none",
+                  borderRadius: 8,
+                  cursor: "pointer",
+                  fontSize: 20,
+                  padding: "8px 8px",
+                  minWidth: 36,
+                  minHeight: 36,
+                  display: "flex",
+                  alignItems: "center",
+                  justifyContent: "center",
+                  color: voiceSearch.isListening ? "#fff" : "#6b7280",
+                  transition: "background 0.15s",
+                }}
+                title={voiceSearch.isListening ? "Stop listening" : "Search with voice"}
+              >
+                🎤
+              </button>
+            )}
+
+            {/* Real-time Suggestions */}
+            <SearchSuggestions
+              query={searchQuery}
+              visible={showSuggestions && !voiceSearch.isListening}
+              onClose={() => setShowSuggestions(false)}
+              onSelectSuggestion={() => setShowSuggestions(false)}
+            />
           </div>
+          <button
+            onClick={() => setShowFilters(!showFilters)}
+            style={{
+              ...TOUCH_TARGET,
+              padding: "0 12px",
+              borderRadius: 8,
+              border: "1px solid #e5e7eb",
+              background: showFilters ? "#4f46e5" : "#fff",
+              color: showFilters ? "#fff" : "#374151",
+              fontSize: 13,
+              fontWeight: 600,
+              cursor: "pointer",
+              whiteSpace: "nowrap",
+              gap: 4,
+            }}
+          >
+            {isMobile ? "⚙️" : showFilters ? "▲ Filters" : "▼ Filters"}
+          </button>
+        </div>
+      </div>
+
+      {/* Voice search listening indicator */}
+      {voiceSearch.isListening && (
+        <div style={{
+          background: "#fef2f2",
+          padding: "10px 16px",
+          borderRadius: 8,
+          marginBottom: 12,
+          display: "flex",
+          alignItems: "center",
+          gap: 8,
+          fontSize: 14,
+          color: "#dc2626",
+        }}>
+          <span style={{ display: "inline-block", width: 8, height: 8, borderRadius: "50%", background: "#dc2626", animation: "pulse 1s infinite" }} />
+          Listening... speak now
+          <button
+            onClick={voiceSearch.stopListening}
+            style={{
+              marginLeft: "auto",
+              background: "#dc2626",
+              color: "#fff",
+              border: "none",
+              borderRadius: 4,
+              padding: "4px 12px",
+              cursor: "pointer",
+              fontSize: 12,
+            }}
+          >
+            Stop
+          </button>
+        </div>
+      )}
+
+      {/* Voice search error */}
+      {voiceSearch.hasError && !voiceSearch.isListening && (
+        <div style={{
+          background: "#fef3c7",
+          padding: "8px 12px",
+          borderRadius: 8,
+          marginBottom: 12,
+          fontSize: 13,
+          color: "#92400e",
+        }}>
+          Voice search: {voiceSearch.errorMessage === "no-speech" ? "No speech detected. Try again." : voiceSearch.errorMessage}
+        </div>
+      )}
+
+      {/* Filters Panel */}
+      {showFilters && (
+        <div style={{
+          background: "#fff",
+          borderRadius: 10,
+          padding: isMobile ? 12 : 16,
+          marginBottom: 16,
+          border: "1px solid #e5e7eb",
+          display: "flex",
+          flexDirection: isMobile ? "column" : "row",
+          gap: 12,
+          alignItems: isMobile ? "stretch" : "end",
+        }}>
+          <div style={{ minWidth: isMobile ? 0 : 160, flex: 1 }}>
+            <label style={{ display: "block", fontSize: 12, fontWeight: 600, color: "#6b7280", marginBottom: 4 }}>Genre</label>
+            <select
+              value={filters.genre}
+              onChange={(e) => handleFilterChange("genre", e.target.value)}
+              style={{
+                width: "100%",
+                padding: "8px 12px",
+                borderRadius: 6,
+                border: "1px solid #e5e7eb",
+                fontSize: 14,
+                background: "#fff",
+                cursor: "pointer",
+                minHeight: 36,
+              }}
+            >
+              <option value="">All Genres</option>
+              {genres.map((g) => <option key={g} value={g}>{g}</option>)}
+            </select>
+          </div>
+          <div style={{ minWidth: isMobile ? 0 : 160, flex: 1 }}>
+            <label style={{ display: "block", fontSize: 12, fontWeight: 600, color: "#6b7280", marginBottom: 4 }}>Author</label>
+            <select
+              value={filters.author}
+              onChange={(e) => handleFilterChange("author", e.target.value)}
+              style={{
+                width: "100%",
+                padding: "8px 12px",
+                borderRadius: 6,
+                border: "1px solid #e5e7eb",
+                fontSize: 14,
+                background: "#fff",
+                cursor: "pointer",
+                minHeight: 36,
+              }}
+            >
+              <option value="">All Authors</option>
+              {authors.map((a) => <option key={a} value={a}>{a}</option>)}
+            </select>
+          </div>
+          <div style={{ minWidth: isMobile ? 0 : 160, flex: 1 }}>
+            <label style={{ display: "block", fontSize: 12, fontWeight: 600, color: "#6b7280", marginBottom: 4 }}>Status</label>
+            <select
+              value={filters.reading_status}
+              onChange={(e) => handleFilterChange("reading_status", e.target.value)}
+              style={{
+                width: "100%",
+                padding: "8px 12px",
+                borderRadius: 6,
+                border: "1px solid #e5e7eb",
+                fontSize: 14,
+                background: "#fff",
+                cursor: "pointer",
+                minHeight: 36,
+              }}
+            >
+              {READING_STATUS_OPTIONS.map((opt) => <option key={opt.value} value={opt.value}>{opt.label}</option>)}
+            </select>
+          </div>
+          {hasActiveFilters && (
+            <button
+              onClick={clearAllFilters}
+              style={{
+                ...TOUCH_TARGET,
+                padding: "8px 16px",
+                borderRadius: 6,
+                border: "1px solid #e5e7eb",
+                background: "#fff",
+                color: "#6b7280",
+                fontSize: 13,
+                cursor: "pointer",
+                whiteSpace: "nowrap",
+                width: isMobile ? "100%" : "auto",
+              }}
+            >
+              ✕ Clear
+            </button>
+          )}
+        </div>
+      )}
+
+      {/* Error State */}
+      {error && (
+        <div style={{ background: "#fef2f2", padding: 16, borderRadius: 8, marginBottom: 16, textAlign: "center" }}>
+          <p style={{ color: "#dc2626", fontSize: 14 }}>{error}</p>
+          <button onClick={() => void loadBooks({})} style={{ marginTop: 8, padding: "8px 16px", border: "none", borderRadius: 6, background: "#dc2626", color: "#fff", cursor: "pointer", fontSize: 13, minHeight: 36 }}>Retry</button>
+        </div>
+      )}
+
+      {/* Loading State */}
+      {loading && (
+        <div style={{
+          display: "grid",
+          gridTemplateColumns: isMobile ? "1fr" : "repeat(auto-fill, minmax(200px, 1fr))",
+          gap: isMobile ? 12 : 16,
+          opacity: 0.6,
+        }}>
+          {Array.from({ length: isMobile ? 4 : 8 }).map((_, i) => (
+            <div key={i} style={{ background: "#fff", borderRadius: 12, overflow: "hidden", boxShadow: "0 2px 8px rgba(0,0,0,0.06)", display: isMobile ? "flex" : "block" }}>
+              <div style={{ width: isMobile ? 80 : "100%", height: isMobile ? 120 : 180, background: "#f0f0f0", flexShrink: 0 }} />
               <div style={{ padding: 12 }}>
-              <h3 style={{ fontSize: 14, fontWeight: 600, color: "#1a1a2e", marginBottom: 4, overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap" }}>{book.title}</h3>
+                <div style={{ height: 14, background: "#f0f0f0", borderRadius: 4, marginBottom: 6, width: "70%" }} />
-              <p style={{ fontSize: 12, color: "#888", marginBottom: 8 }}>{book.author || "Unknown Author"}</p>
+                <div style={{ height: 12, background: "#f0f0f0", borderRadius: 4, width: "40%" }} />
-              {book.progress !== null && <div style={{ width: "100%", height: 4, background: "#eee", borderRadius: 2, overflow: "hidden" }}><div style={{ height: "100%", background: "#1a1a2e", borderRadius: 2, width: `${Math.min(book.progress, 100)}%` }} /></div>}
               </div>
             </div>
           ))}
         </div>
+      )}
+
+      {/* Empty State */}
+      {!loading && !error && books.length === 0 && (
+        <div style={{ textAlign: "center", padding: isMobile ? "60px 16px" : "80px 20px" }}>
+          <div style={{ fontSize: isMobile ? 48 : 64, marginBottom: 16 }}>{hasActiveFilters ? "🔍" : "📚"}</div>
+          <h2 style={{ fontSize: isMobile ? 18 : 20, color: "#1f2937", marginBottom: 8 }}>
+            {hasActiveFilters ? "No books found" : "Your library is empty"}
+          </h2>
+          <p style={{ color: "#6b7280", marginBottom: 20, fontSize: 15, lineHeight: 1.5 }}>
+            {hasActiveFilters
+              ? "Try adjusting your search query or filters to discover more books."
+              : "Add a book to get started building your collection."}
+          </p>
+          {hasActiveFilters ? (
+            <button onClick={clearAllFilters} className="btn" style={{ padding: "12px 24px", fontSize: 15, minHeight: 44 }}>
+              Clear All Filters
+            </button>
+          ) : (
+            <button onClick={() => navigate("/add")} className="btn" style={{ padding: "12px 24px", fontSize: 15, minHeight: 44 }}>
+              Add Your First Book
+            </button>
+          )}
+        </div>
+      )}
+
+      {/* Results Grid */}
+      {!loading && books.length > 0 && (
+        <div style={{
+          display: "grid",
+          gridTemplateColumns: isMobile ? "1fr" : "repeat(auto-fill, minmax(200px, 1fr))",
+          gap: isMobile ? 12 : 16,
+        }}>
+          {books.map((book) => {
+            const statusColors: Record<string, { bg: string; text: string }> = {
+              want_to_read: { bg: "#dbeafe", text: "#1d4ed8" },
+              reading: { bg: "#dcfce7", text: "#16a34a" },
+              finished: { bg: "#f3e8ff", text: "#9333ea" },
+              dnf: { bg: "#fef3c7", text: "#b45309" },
+            };
+            const sc = statusColors[book.reading_status] ?? { bg: "#f3f4f6", text: "#6b7280" };
+
+            return (
+              <div
+                key={book.id}
+                onClick={() => navigate(`/books/${book.id}`)}
+                className={styles.bookCard}
+                style={{
+                  display: isMobile ? "flex" : "block",
+                }}
+              >
+                <div style={{
+                  width: isMobile ? 80 : "100%",
+                  height: isMobile ? 120 : 180,
+                  background: "#f0f0f0",
+                  display: "flex",
+                  alignItems: "center",
+                  justifyContent: "center",
+                  position: "relative",
+                  flexShrink: 0,
+                }}>
+                  {book.cover_image
+                    ? <img src={book.cover_image} alt={book.title} style={{ width: "100%", height: "100%", objectFit: "cover" }} />
+                    : <span style={{ fontSize: isMobile ? 32 : 48 }}>📖</span>}
+                  {!isMobile && (
+                    <span style={{
+                      position: "absolute", top: 8, right: 8,
+                      background: sc.bg, color: sc.text, fontSize: 11, fontWeight: 600,
+                      padding: "2px 8px", borderRadius: 999, lineHeight: "18px",
+                    }}>
+                      {book.reading_status_display}
+                    </span>
+                  )}
+                </div>
+                <div style={{ padding: isMobile ? "8px 12px" : 12, flex: 1 }}>
+                  <div style={{ display: "flex", alignItems: "flex-start", justifyContent: "space-between", gap: 8 }}>
+                    <div style={{ minWidth: 0, flex: 1 }}>
+                      <h3 style={{
+                        fontSize: isMobile ? 14 : 14,
+                        fontWeight: 600,
+                        color: "#1f2937",
+                        marginBottom: 2,
+                        margin: 0,
+                        overflow: "hidden",
+                        textOverflow: "ellipsis",
+                        whiteSpace: "nowrap",
+                      }}>
+                        {book.title}
+                      </h3>
+                      <p style={{ fontSize: 12, color: "#6b7280", marginBottom: 4, margin: "2px 0" }}>
+                        {book.author || "Unknown Author"}
+                      </p>
+                    </div>
+                    {isMobile && (
+                      <span style={{
+                        background: sc.bg, color: sc.text, fontSize: 10, fontWeight: 600,
+                        padding: "2px 6px", borderRadius: 999, whiteSpace: "nowrap", flexShrink: 0,
+                      }}>
+                        {book.reading_status_display}
+                      </span>
+                    )}
+                  </div>
+                  {book.genre && (
+                    <span style={{ fontSize: 11, color: "#4f46e5", background: "#eef2ff", padding: "1px 6px", borderRadius: 4, display: "inline-block", marginTop: 4 }}>
+                      {book.genre}
+                    </span>
+                  )}
+                </div>
+              </div>
+            );
+          })}
+        </div>
+      )}
     </div>
   );
 }

frontend/src/types/book.ts

@@ -27,6 +27,8 @@ export interface EBookListItem {
   title: string;
   author: string;
   filename: string;
+  format: string;
+  page_count: number;
   cover_image: string | null;
   created_at: string;
   progress: number | null;
@@ -38,6 +40,10 @@ export interface EBookDetail {
   author: string;
   filename: string;
   file_url: string;
+  format: string;
+  page_count: number;
+  file_size: number;
+  metadata_json: Record<string, unknown>;
   cover_image: string | null;
   created_at: string;
   updated_at: string;
@@ -54,3 +60,43 @@ export interface ReadingSettings {
   font_style: "sans-serif" | "serif" | "monospace";
   background_color: string;
 }
+
+export interface BookChapter {
+  id: number;
+  title: string;
+  index: number;
+  href: string;
+  children: BookChapter[];
+}
+
+export interface TocResponse {
+  chapters: BookChapter[];
+  format: string;
+  page_count: number;
+}
+
+export interface ContentResponse {
+  page: number;
+  total_pages: number;
+  content: string;
+  chapter_title: string;
+  format: string;
+}
+
+export interface BookSearchParams {
+  q?: string;
+  genre?: string;
+  author?: string;
+  reading_status?: string;
+  ordering?: string;
+  page?: number;
+  page_size?: number;
+}
+
+export const READING_STATUS_OPTIONS: { value: string; label: string }[] = [
+  { value: "", label: "All Statuses" },
+  { value: "want_to_read", label: "Want to Read" },
+  { value: "reading", label: "Reading" },
+  { value: "finished", label: "Finished" },
+  { value: "dnf", label: "Did Not Finish" },
+];

frontend/src/types/speech-recognition.d.ts

@@ -0,0 +1,54 @@
+/**
+ * Type declarations for the Web Speech API (SpeechRecognition).
+ * These are not part of the standard TypeScript DOM lib types.
+ * Install @types/dom-speech-recognition for full coverage.
+ */
+
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
+interface SpeechRecognition extends EventTarget {
+  continuous: boolean;
+  interimResults: boolean;
+  lang: string;
+  onresult: ((event: SpeechRecognitionEvent) => void) | null;
+  onerror: ((event: SpeechRecognitionErrorEvent) => void) | null;
+  onend: (() => void) | null;
+  start(): void;
+  stop(): void;
+  abort(): void;
+}
+
+interface SpeechRecognitionEvent extends Event {
+  readonly resultIndex: number;
+  readonly results: SpeechRecognitionResultList;
+}
+
+interface SpeechRecognitionResultList {
+  readonly length: number;
+  [index: number]: SpeechRecognitionResult;
+}
+
+interface SpeechRecognitionResult {
+  readonly isFinal: boolean;
+  readonly length: number;
+  [index: number]: SpeechRecognitionAlternative;
+}
+
+interface SpeechRecognitionAlternative {
+  readonly transcript: string;
+  readonly confidence: number;
+}
+
+interface SpeechRecognitionErrorEvent extends Event {
+  readonly error: string;
+  readonly message: string;
+}
+
+interface SpeechRecognitionConstructor {
+  new (): SpeechRecognition;
+}
+
+interface Window {
+  SpeechRecognition?: SpeechRecognitionConstructor;
+  webkitSpeechRecognition?: SpeechRecognitionConstructor;
+}

mobile/App.tsx

@@ -0,0 +1,16 @@
+import React from "react";
+import { NavigationContainer } from "@react-navigation/native";
+import { StatusBar } from "expo-status-bar";
+import { AuthProvider } from "./src/context/AuthContext";
+import { RootNavigator } from "./src/navigation/RootNavigator";
+
+export default function App() {
+  return (
+    <AuthProvider>
+      <NavigationContainer>
+        <StatusBar style="auto" />
+        <RootNavigator />
+      </NavigationContainer>
+    </AuthProvider>
+  );
+}

mobile/app.json

@@ -0,0 +1,28 @@
+{
+  "expo": {
+    "name": "Cloud Reader",
+    "slug": "cloud-reader",
+    "version": "1.0.0",
+    "orientation": "portrait",
+    "icon": "./assets/icon.png",
+    "userInterfaceStyle": "automatic",
+    "newArchEnabled": true,
+    "splash": {
+      "backgroundColor": "#1a1a2e"
+    },
+    "ios": {
+      "supportsTablet": true,
+      "bundleIdentifier": "com.cloudreader.app"
+    },
+    "android": {
+      "adaptiveIcon": {
+        "backgroundColor": "#1a1a2e"
+      },
+      "package": "com.cloudreader.app"
+    },
+    "plugins": [
+      "expo-document-picker",
+      "expo-file-system"
+    ]
+  }
+}

mobile/babel.config.js

@@ -0,0 +1,7 @@
+module.exports = function (api) {
+  api.cache(true);
+  return {
+    presets: ["babel-preset-expo"],
+    plugins: ["react-native-reanimated/plugin"],
+  };
+};

mobile/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@cloud-reader/mobile",
+  "version": "1.0.0",
+  "private": true,
+  "main": "expo/AppEntry.js",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web",
+    "lint": "eslint ."
+  },
+  "dependencies": {
+    "expo": "~52.0.0",
+    "expo-status-bar": "~2.0.0",
+    "react": "^19.0.0",
+    "react-native": "0.76.6",
+    "react-native-safe-area-context": "4.14.1",
+    "react-native-screens": "~4.4.0",
+    "@react-navigation/native": "^7.0.0",
+    "@react-navigation/native-stack": "^7.0.0",
+    "@react-navigation/bottom-tabs": "^7.0.0",
+    "axios": "^1.7.9",
+    "@react-native-async-storage/async-storage": "2.1.0",
+    "expo-document-picker": "~13.0.0",
+    "expo-file-system": "~18.0.0",
+    "react-native-gesture-handler": "~2.20.0",
+    "react-native-reanimated": "~3.16.0",
+    "@cloud-reader/shared": "*"
+  },
+  "devDependencies": {
+    "@types/react": "~19.0.0",
+    "typescript": "~5.7.0"
+  }
+}

mobile/src/api/annotations.ts

@@ -0,0 +1,55 @@
+import api from "./client";
+import type {
+  Bookmark,
+  Note,
+  CreateBookmarkPayload,
+  CreateNotePayload,
+  PaginatedResponse,
+} from "@cloud-reader/shared";
+
+export function fetchBookmarks(
+  bookId?: string,
+): Promise<PaginatedResponse<Bookmark>> {
+  const params = bookId ? { book: bookId } : {};
+  return api
+    .get<PaginatedResponse<Bookmark>>("/api/annotations/bookmarks/", { params })
+    .then((res) => res.data);
+}
+
+export function createBookmark(
+  payload: CreateBookmarkPayload,
+): Promise<Bookmark> {
+  return api
+    .post<Bookmark>("/api/annotations/bookmarks/", payload)
+    .then((res) => res.data);
+}
+
+export function deleteBookmark(id: string): Promise<void> {
+  return api.delete(`/api/annotations/bookmarks/${id}/`).then(() => {});
+}
+
+export function fetchNotes(bookId?: string): Promise<PaginatedResponse<Note>> {
+  const params = bookId ? { book: bookId } : {};
+  return api
+    .get<PaginatedResponse<Note>>("/api/annotations/notes/", { params })
+    .then((res) => res.data);
+}
+
+export function createNote(payload: CreateNotePayload): Promise<Note> {
+  return api
+    .post<Note>("/api/annotations/notes/", payload)
+    .then((res) => res.data);
+}
+
+export function updateNote(
+  id: string,
+  content: string,
+): Promise<Note> {
+  return api
+    .patch<Note>(`/api/annotations/notes/${id}/`, { content })
+    .then((res) => res.data);
+}
+
+export function deleteNote(id: string): Promise<void> {
+  return api.delete(`/api/annotations/notes/${id}/`).then(() => {});
+}

mobile/src/api/books.ts

@@ -0,0 +1,31 @@
+import api from "./client";
+import type { Book, PaginatedResponse } from "@cloud-reader/shared";
+
+export function fetchBooks(
+  page = 1,
+  pageSize = 20,
+): Promise<PaginatedResponse<Book>> {
+  return api
+    .get<PaginatedResponse<Book>>("/api/books/", {
+      params: { page, page_size: pageSize },
+    })
+    .then((res) => res.data);
+}
+
+export function fetchBook(id: string): Promise<Book> {
+  return api.get<Book>(`/api/books/${id}/`).then((res) => res.data);
+}
+
+export function searchBooks(
+  query: string,
+): Promise<PaginatedResponse<Book>> {
+  return api
+    .get<PaginatedResponse<Book>>("/api/books/search/", {
+      params: { q: query },
+    })
+    .then((res) => res.data);
+}
+
+export function deleteBook(id: string): Promise<void> {
+  return api.delete(`/api/books/${id}/`).then(() => {});
+}

mobile/src/api/client.ts

@@ -0,0 +1,140 @@
+import axios, { type AxiosError, type InternalAxiosRequestConfig } from "axios";
+import AsyncStorage from "@react-native-async-storage/async-storage";
+
+const STORAGE_KEYS = {
+  ACCESS_TOKEN: "access_token",
+  REFRESH_TOKEN: "refresh_token",
+} as const;
+
+interface RetryConfig extends InternalAxiosRequestConfig {
+  _retry?: boolean;
+}
+
+const api = axios.create({
+  baseURL: process.env.EXPO_PUBLIC_API_URL || "http://localhost:8000",
+  headers: {
+    "Content-Type": "application/json",
+  },
+});
+
+// ── Token helpers ────────────────────────────────────────────────────
+
+async function getAccessToken(): Promise<string | null> {
+  return AsyncStorage.getItem(STORAGE_KEYS.ACCESS_TOKEN);
+}
+
+async function getRefreshToken(): Promise<string | null> {
+  return AsyncStorage.getItem(STORAGE_KEYS.REFRESH_TOKEN);
+}
+
+async function setTokens(access: string, refresh: string): Promise<void> {
+  await AsyncStorage.setItem(STORAGE_KEYS.ACCESS_TOKEN, access);
+  await AsyncStorage.setItem(STORAGE_KEYS.REFRESH_TOKEN, refresh);
+}
+
+async function clearTokens(): Promise<void> {
+  await AsyncStorage.multiRemove([
+    STORAGE_KEYS.ACCESS_TOKEN,
+    STORAGE_KEYS.REFRESH_TOKEN,
+  ]);
+}
+
+// ── Request interceptor ─────────────────────────────────────────────
+
+api.interceptors.request.use(async (config: InternalAxiosRequestConfig) => {
+  const token = await getAccessToken();
+  if (token && config.headers) {
+    config.headers.Authorization = `Bearer ${token}`;
+  }
+  return config;
+});
+
+// ── Response interceptor: auto-refresh on 401 ───────────────────────
+
+let isRefreshing = false;
+let failedQueue: Array<{
+  resolve: (token: string) => void;
+  reject: (err: unknown) => void;
+}> = [];
+
+function processQueue(error: unknown, token: string | null = null): void {
+  failedQueue.forEach((prom) => {
+    if (error) {
+      prom.reject(error);
+    } else if (token) {
+      prom.resolve(token);
+    }
+  });
+  failedQueue = [];
+}
+
+api.interceptors.response.use(
+  (response) => response,
+  async (error: AxiosError) => {
+    const originalRequest = error.config as RetryConfig | undefined;
+
+    if (!originalRequest) {
+      return Promise.reject(error);
+    }
+
+    if (
+      error.response?.status !== 401 ||
+      originalRequest._retry ||
+      originalRequest.url?.includes("/api/auth/token/refresh/") ||
+      originalRequest.url?.includes("/api/auth/login/") ||
+      originalRequest.url?.includes("/api/auth/register/") ||
+      originalRequest.url?.includes("/api/auth/logout/")
+    ) {
+      return Promise.reject(error);
+    }
+
+    if (isRefreshing) {
+      return new Promise<string>((resolve, reject) => {
+        failedQueue.push({ resolve, reject });
+      }).then((token) => {
+        if (originalRequest.headers) {
+          originalRequest.headers.Authorization = `Bearer ${token}`;
+        }
+        return api(originalRequest);
+      });
+    }
+
+    originalRequest._retry = true;
+    isRefreshing = true;
+
+    const refreshToken = await getRefreshToken();
+
+    if (!refreshToken) {
+      isRefreshing = false;
+      await clearTokens();
+      return Promise.reject(error);
+    }
+
+    try {
+      const response = await axios.post(
+        `${api.defaults.baseURL}/api/auth/token/refresh/`,
+        { refresh: refreshToken },
+      );
+
+      const newAccess = response.data.access as string;
+      const newRefresh = response.data.refresh as string;
+      await setTokens(newAccess, newRefresh);
+
+      processQueue(null, newAccess);
+
+      if (originalRequest.headers) {
+        originalRequest.headers.Authorization = `Bearer ${newAccess}`;
+      }
+      return api(originalRequest);
+    } catch (refreshError) {
+      processQueue(refreshError, null);
+      await clearTokens();
+      return Promise.reject(refreshError);
+    } finally {
+      isRefreshing = false;
+    }
+  },
+);
+
+export { getAccessToken, getRefreshToken, setTokens, clearTokens };
+export default api;

mobile/src/api/ebooks.ts

@@ -0,0 +1,54 @@
+import { apiClient } from "./client";
+import type {
+  EBookListItem,
+  EBookDetail,
+  ReadingProgress,
+  ReadingSettings,
+  TocResponse,
+  ContentResponse,
+  PaginatedResponse,
+} from "@cloud-reader/shared";
+
+export const ebooksApi = {
+  /** List uploaded e-books */
+  list() {
+    return apiClient.get<PaginatedResponse<EBookListItem>>("/api/ebooks/");
+  },
+
+  /** Get e-book detail */
+  get(id: number) {
+    return apiClient.get<EBookDetail>(`/api/ebooks/${id}/`);
+  },
+
+  /** Get table of contents */
+  getToc(id: number) {
+    return apiClient.get<TocResponse>(`/api/ebooks/${id}/toc/`);
+  },
+
+  /** Get page content */
+  getContent(id: number, page: number) {
+    return apiClient.get<ContentResponse>(
+      `/api/ebooks/${id}/content/?page=${page}`,
+    );
+  },
+
+  /** Update reading progress */
+  updateProgress(id: number, data: Partial<ReadingProgress>) {
+    return apiClient.patch<ReadingProgress>(
+      `/api/ebooks/${id}/progress/`,
+      data,
+    );
+  },
+
+  /** Get or update reading settings */
+  getSettings(id: number) {
+    return apiClient.get<ReadingSettings>(`/api/ebooks/${id}/settings/`);
+  },
+
+  updateSettings(id: number, data: Partial<ReadingSettings>) {
+    return apiClient.patch<ReadingSettings>(
+      `/api/ebooks/${id}/settings/`,
+      data,
+    );
+  },
+};

mobile/src/api/index.ts

@@ -0,0 +1,4 @@
+export { apiClient, saveTokens, loadTokens, clearTokens } from "./client";
+export { booksApi } from "./books";
+export { ebooksApi } from "./ebooks";
+export { annotationsApi } from "./annotations";

mobile/src/context/AuthContext.tsx

@@ -0,0 +1,104 @@
+import React, {
+  createContext,
+  useContext,
+  useState,
+  useEffect,
+  useCallback,
+  type ReactNode,
+} from "react";
+import type { User, TokenResponse } from "@cloud-reader/shared";
+import { apiClient, saveTokens, loadTokens, clearTokens } from "../api/client";
+
+interface AuthState {
+  user: User | null;
+  isLoading: boolean;
+  isAuthenticated: boolean;
+}
+
+interface AuthContextValue extends AuthState {
+  login: (email: string, password: string) => Promise<void>;
+  register: (
+    email: string,
+    username: string,
+    password: string,
+  ) => Promise<void>;
+  logout: () => Promise<void>;
+}
+
+const AuthContext = createContext<AuthContextValue | null>(null);
+
+export function AuthProvider({ children }: { children: ReactNode }) {
+  const [state, setState] = useState<AuthState>({
+    user: null,
+    isLoading: true,
+    isAuthenticated: false,
+  });
+
+  // Restore session on mount
+  useEffect(() => {
+    (async () => {
+      try {
+        const tokens = await loadTokens();
+        if (tokens?.access) {
+          const response = await apiClient.get<User>("/api/auth/profile/");
+          setState({
+            user: response.data,
+            isLoading: false,
+            isAuthenticated: true,
+          });
+          return;
+        }
+      } catch {
+        await clearTokens();
+      }
+      setState({ user: null, isLoading: false, isAuthenticated: false });
+    })();
+  }, []);
+
+  const login = useCallback(async (email: string, password: string) => {
+    const response = await apiClient.post<TokenResponse>(
+      "/api/auth/login/",
+      { email, password },
+    );
+    await saveTokens(response.data);
+    const profile = await apiClient.get<User>("/api/auth/profile/");
+    setState({
+      user: profile.data,
+      isLoading: false,
+      isAuthenticated: true,
+    });
+  }, []);
+
+  const register = useCallback(
+    async (email: string, username: string, password: string) => {
+      await apiClient.post("/api/auth/register/", {
+        email,
+        username,
+        password,
+        password2: password,
+      });
+      // Auto-login after registration
+      await login(email, password);
+    },
+    [login],
+  );
+
+  const logout = useCallback(async () => {
+    await clearTokens();
+    setState({ user: null, isLoading: false, isAuthenticated: false });
+  }, []);
+
+  return (
+    <AuthContext.Provider value={{ ...state, login, register, logout }}>
+      {children}
+    </AuthContext.Provider>
+  );
+}
+
+export function useAuth(): AuthContextValue {
+  const ctx = useContext(AuthContext);
+  if (!ctx) {
+    throw new Error("useAuth must be used within an AuthProvider");
+  }
+  return ctx;
+}

mobile/src/hooks/index.ts

@@ -0,0 +1,2 @@
+export { useAuth } from "../context/AuthContext";
+export { useAsyncData } from "./useAsyncData";

mobile/src/hooks/useAsyncData.ts

@@ -0,0 +1,33 @@
+import { useState, useEffect, useCallback } from "react";
+
+/**
+ * Generic async data fetching hook for mobile screens.
+ */
+export function useAsyncData<T>(
+  fetcher: () => Promise<T>,
+  deps: unknown[] = [],
+) {
+  const [data, setData] = useState<T | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<Error | null>(null);
+
+  const execute = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const result = await fetcher();
+      setData(result);
+    } catch (err) {
+      setError(err instanceof Error ? err : new Error(String(err)));
+    } finally {
+      setLoading(false);
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, deps);
+
+  useEffect(() => {
+    execute();
+  }, [execute]);
+
+  return { data, loading, error, refetch: execute };
+}

mobile/src/navigation/AppNavigator.tsx

@@ -0,0 +1,45 @@
+import { type ReactNode } from "react";
+import { NavigationContainer } from "@react-navigation/native";
+import { createNativeStackNavigator } from "@react-navigation/native-stack";
+import { useAuth } from "../context/AuthContext";
+import LoginScreen from "../screens/LoginScreen";
+import RegisterScreen from "../screens/RegisterScreen";
+import MainTabs from "./MainTabs";
+
+export type AuthStackParamList = {
+  Login: undefined;
+  Register: undefined;
+};
+
+export type RootStackParamList = {
+  Auth: undefined;
+  Main: undefined;
+};
+
+const RootStack = createNativeStackNavigator<RootStackParamList>();
+const AuthStack = createNativeStackNavigator<AuthStackParamList>();
+
+function AuthNavigator(): ReactNode {
+  return (
+    <AuthStack.Navigator screenOptions={{ headerShown: false }}>
+      <AuthStack.Screen name="Login" component={LoginScreen} />
+      <AuthStack.Screen name="Register" component={RegisterScreen} />
+    </AuthStack.Navigator>
+  );
+}
+
+export default function AppNavigator(): ReactNode {
+  const { state } = useAuth();
+
+  return (
+    <NavigationContainer>
+      <RootStack.Navigator screenOptions={{ headerShown: false }}>
+        {state.isAuthenticated ? (
+          <RootStack.Screen name="Main" component={MainTabs} />
+        ) : (
+          <RootStack.Screen name="Auth" component={AuthNavigator} />
+        )}
+      </RootStack.Navigator>
+    </NavigationContainer>
+  );
+}

mobile/src/navigation/AuthNavigator.tsx

@@ -0,0 +1,24 @@
+import React from "react";
+import { createNativeStackNavigator } from "@react-navigation/native-stack";
+import LoginScreen from "../screens/LoginScreen";
+import RegisterScreen from "../screens/RegisterScreen";
+
+export type AuthStackParamList = {
+  Login: undefined;
+  Register: undefined;
+};
+
+const Stack = createNativeStackNavigator<AuthStackParamList>();
+
+export function AuthNavigator() {
+  return (
+    <Stack.Navigator
+      screenOptions={{
+        headerShown: false,
+      }}
+    >
+      <Stack.Screen name="Login" component={LoginScreen} />
+      <Stack.Screen name="Register" component={RegisterScreen} />
+    </Stack.Navigator>
+  );
+}

mobile/src/navigation/MainNavigator.tsx

@@ -0,0 +1,68 @@
+import React from "react";
+import { createBottomTabNavigator } from "@react-navigation/bottom-tabs";
+import { Text } from "react-native";
+import LibraryScreen from "../screens/LibraryScreen";
+import SearchScreen from "../screens/SearchScreen";
+import SettingsScreen from "../screens/SettingsScreen";
+
+export type MainTabParamList = {
+  Library: undefined;
+  Search: undefined;
+  Settings: undefined;
+};
+
+const Tab = createBottomTabNavigator<MainTabParamList>();
+
+function TabIcon({ label, focused }: { label: string; focused: boolean }) {
+  const icons: Record<string, string> = {
+    Library: "📚",
+    Search: "🔍",
+    Settings: "⚙️",
+  };
+  return (
+    <Text style={{ fontSize: 22, opacity: focused ? 1 : 0.5 }}>
+      {icons[label] ?? "●"}
+    </Text>
+  );
+}
+
+export function MainNavigator() {
+  return (
+    <Tab.Navigator
+      screenOptions={{
+        headerStyle: { backgroundColor: "#fff" },
+        headerTitleStyle: { fontWeight: "600", color: "#1a1a2e" },
+        tabBarActiveTintColor: "#4a6cf7",
+        tabBarInactiveTintColor: "#999",
+      }}
+    >
+      <Tab.Screen
+        name="Library"
+        component={LibraryScreen}
+        options={{
+          tabBarIcon: ({ focused }) => (
+            <TabIcon label="Library" focused={focused} />
+          ),
+        }}
+      />
+      <Tab.Screen
+        name="Search"
+        component={SearchScreen}
+        options={{
+          tabBarIcon: ({ focused }) => (
+            <TabIcon label="Search" focused={focused} />
+          ),
+        }}
+      />
+      <Tab.Screen
+        name="Settings"
+        component={SettingsScreen}
+        options={{
+          tabBarIcon: ({ focused }) => (
+            <TabIcon label="Settings" focused={focused} />
+          ),
+        }}
+      />
+    </Tab.Navigator>
+  );
+}

mobile/src/navigation/MainTabs.tsx

@@ -0,0 +1,55 @@
+import { type ReactNode } from "react";
+import { createBottomTabNavigator } from "@react-navigation/bottom-tabs";
+import { Text } from "react-native";
+import LibraryScreen from "../screens/LibraryScreen";
+import SearchScreen from "../screens/SearchScreen";
+import SettingsScreen from "../screens/SettingsScreen";
+
+export type MainTabParamList = {
+  Library: undefined;
+  Search: undefined;
+  Settings: undefined;
+};
+
+const Tab = createBottomTabNavigator<MainTabParamList>();
+
+function TabIcon({ label, focused }: { label: string; focused: boolean }) {
+  return (
+    <Text style={{ fontSize: 22, opacity: focused ? 1 : 0.5 }}>
+      {label === "Library" ? "📚" : label === "Search" ? "🔍" : "⚙️"}
+    </Text>
+  );
+}
+
+export default function MainTabs(): ReactNode {
+  return (
+    <Tab.Navigator
+      screenOptions={({ route }) => ({
+        tabBarIcon: ({ focused }: { focused: boolean }) => (
+          <TabIcon label={route.name} focused={focused} />
+        ),
+        tabBarActiveTintColor: "#4f8ef7",
+        tabBarInactiveTintColor: "#888",
+        headerStyle: { backgroundColor: "#1a1a2e" },
+        headerTintColor: "#fff",
+        tabBarStyle: { backgroundColor: "#1a1a2e", borderTopColor: "#333" },
+      })}
+    >
+      <Tab.Screen
+        name="Library"
+        component={LibraryScreen}
+        options={{ title: "My Library" }}
+      />
+      <Tab.Screen
+        name="Search"
+        component={SearchScreen}
+        options={{ title: "Search" }}
+      />
+      <Tab.Screen
+        name="Settings"
+        component={SettingsScreen}
+        options={{ title: "Settings" }}
+      />
+    </Tab.Navigator>
+  );
+}

mobile/src/navigation/RootNavigator.tsx

@@ -0,0 +1,23 @@
+import React from "react";
+import { ActivityIndicator, View } from "react-native";
+import { useAuth } from "../context/AuthContext";
+import { AuthNavigator } from "./AuthNavigator";
+import { MainNavigator } from "./MainNavigator";
+
+export function RootNavigator() {
+  const { isLoading, isAuthenticated } = useAuth();
+
+  if (isLoading) {
+    return (
+      <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
+        <ActivityIndicator size="large" color="#4a6cf7" />
+      </View>
+    );
+  }
+
+  if (!isAuthenticated) {
+    return <AuthNavigator />;
+  }
+
+  return <MainNavigator />;
+}

mobile/src/screens/LibraryScreen.tsx

@@ -0,0 +1,181 @@
+import { useState, useEffect, useCallback, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  FlatList,
+  TouchableOpacity,
+  StyleSheet,
+  ActivityIndicator,
+  RefreshControl,
+} from "react-native";
+import { fetchBooks } from "../api/books";
+import type { Book, PaginatedResponse } from "@cloud-reader/shared";
+
+export default function LibraryScreen({ navigation }: { navigation: any }): ReactNode {
+  const [books, setBooks] = useState<Book[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [refreshing, setRefreshing] = useState(false);
+  const [page, setPage] = useState(1);
+  const [hasMore, setHasMore] = useState(true);
+
+  const loadBooks = useCallback(async (pageNum: number, isRefresh = false) => {
+    try {
+      const data: PaginatedResponse<Book> = await fetchBooks(pageNum);
+      if (isRefresh) {
+        setBooks(data.results);
+      } else {
+        setBooks((prev) => [...prev, ...data.results]);
+      }
+      setHasMore(data.next !== null);
+      setPage(pageNum);
+    } catch {
+      // Silent error for now
+    } finally {
+      setLoading(false);
+      setRefreshing(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    loadBooks(1, true);
+  }, [loadBooks]);
+
+  const onRefresh = () => {
+    setRefreshing(true);
+    loadBooks(1, true);
+  };
+
+  const loadMore = () => {
+    if (hasMore && !loading) {
+      loadBooks(page + 1);
+    }
+  };
+
+  const renderBook = ({ item }: { item: Book }) => (
+    <TouchableOpacity
+      style={styles.bookCard}
+      onPress={() =>
+        navigation.navigate("BookDetail", { bookId: item.id })
+      }
+    >
+      <View style={styles.bookCover}>
+        <Text style={styles.coverText}>
+          {item.title.charAt(0).toUpperCase()}
+        </Text>
+      </View>
+      <View style={styles.bookInfo}>
+        <Text style={styles.bookTitle} numberOfLines={1}>
+          {item.title}
+        </Text>
+        <Text style={styles.bookAuthor} numberOfLines={1}>
+          {item.author}
+        </Text>
+        <Text style={styles.bookPages}>{item.total_pages} pages</Text>
+      </View>
+    </TouchableOpacity>
+  );
+
+  if (loading && books.length === 0) {
+    return (
+      <View style={styles.centered}>
+        <ActivityIndicator size="large" color="#4f8ef7" />
+      </View>
+    );
+  }
+
+  return (
+    <View style={styles.container}>
+      <FlatList
+        data={books}
+        renderItem={renderBook}
+        keyExtractor={(item) => item.id}
+        onEndReached={loadMore}
+        onEndReachedThreshold={0.5}
+        contentContainerStyle={styles.list}
+        refreshControl={
+          <RefreshControl
+            refreshing={refreshing}
+            onRefresh={onRefresh}
+            tintColor="#4f8ef7"
+          />
+        }
+        ListEmptyComponent={
+          <View style={styles.centered}>
+            <Text style={styles.emptyText}>Your library is empty</Text>
+            <Text style={styles.emptySubtext}>
+              Add books to get started
+            </Text>
+          </View>
+        }
+      />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+  },
+  centered: {
+    flex: 1,
+    justifyContent: "center",
+    alignItems: "center",
+    padding: 24,
+  },
+  list: {
+    padding: 16,
+  },
+  bookCard: {
+    flexDirection: "row",
+    backgroundColor: "#1a1a2e",
+    borderRadius: 12,
+    padding: 12,
+    marginBottom: 12,
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  bookCover: {
+    width: 60,
+    height: 80,
+    backgroundColor: "#2a2a4e",
+    borderRadius: 8,
+    justifyContent: "center",
+    alignItems: "center",
+  },
+  coverText: {
+    fontSize: 24,
+    fontWeight: "bold",
+    color: "#4f8ef7",
+  },
+  bookInfo: {
+    flex: 1,
+    marginLeft: 12,
+    justifyContent: "center",
+  },
+  bookTitle: {
+    fontSize: 16,
+    fontWeight: "600",
+    color: "#fff",
+    marginBottom: 4,
+  },
+  bookAuthor: {
+    fontSize: 14,
+    color: "#888",
+    marginBottom: 4,
+  },
+  bookPages: {
+    fontSize: 12,
+    color: "#666",
+  },
+  emptyText: {
+    fontSize: 18,
+    fontWeight: "600",
+    color: "#888",
+    marginBottom: 8,
+  },
+  emptySubtext: {
+    fontSize: 14,
+    color: "#666",
+  },
+});

mobile/src/screens/LoginScreen.tsx

@@ -0,0 +1,173 @@
+import { useState, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  TextInput,
+  TouchableOpacity,
+  StyleSheet,
+  Alert,
+  ActivityIndicator,
+  KeyboardAvoidingView,
+  Platform,
+} from "react-native";
+import { useAuth } from "../context/AuthContext";
+import { isValidEmail } from "@cloud-reader/shared";
+
+export default function LoginScreen({ navigation }: { navigation: any }): ReactNode {
+  const { state, login, clearError } = useAuth();
+  const [email, setEmail] = useState("");
+  const [password, setPassword] = useState("");
+
+  const handleLogin = async () => {
+    clearError();
+
+    if (!email.trim()) {
+      Alert.alert("Validation Error", "Please enter your email.");
+      return;
+    }
+    if (!isValidEmail(email.trim())) {
+      Alert.alert("Validation Error", "Please enter a valid email address.");
+      return;
+    }
+    if (!password) {
+      Alert.alert("Validation Error", "Please enter your password.");
+      return;
+    }
+
+    try {
+      await login(email.trim(), password);
+    } catch {
+      // Error handled in context
+    }
+  };
+
+  return (
+    <KeyboardAvoidingView
+      style={styles.container}
+      behavior={Platform.OS === "ios" ? "padding" : "height"}
+    >
+      <View style={styles.inner}>
+        <Text style={styles.title}>Cloud Reader</Text>
+        <Text style={styles.subtitle}>Sign in to your account</Text>
+
+        {state.error && (
+          <View style={styles.errorBox}>
+            <Text style={styles.errorText}>{state.error}</Text>
+          </View>
+        )}
+
+        <TextInput
+          style={styles.input}
+          placeholder="Email"
+          placeholderTextColor="#666"
+          value={email}
+          onChangeText={setEmail}
+          keyboardType="email-address"
+          autoCapitalize="none"
+          autoCorrect={false}
+        />
+
+        <TextInput
+          style={styles.input}
+          placeholder="Password"
+          placeholderTextColor="#666"
+          value={password}
+          onChangeText={setPassword}
+          secureTextEntry
+        />
+
+        <TouchableOpacity
+          style={[styles.button, state.isLoading && styles.buttonDisabled]}
+          onPress={handleLogin}
+          disabled={state.isLoading}
+        >
+          {state.isLoading ? (
+            <ActivityIndicator color="#fff" />
+          ) : (
+            <Text style={styles.buttonText}>Sign In</Text>
+          )}
+        </TouchableOpacity>
+
+        <TouchableOpacity onPress={() => navigation.navigate("Register")}>
+          <Text style={styles.linkText}>
+            Don't have an account?{" "}
+            <Text style={styles.linkBold}>Sign Up</Text>
+          </Text>
+        </TouchableOpacity>
+      </View>
+    </KeyboardAvoidingView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+  },
+  inner: {
+    flex: 1,
+    justifyContent: "center",
+    paddingHorizontal: 24,
+  },
+  title: {
+    fontSize: 32,
+    fontWeight: "bold",
+    color: "#fff",
+    textAlign: "center",
+    marginBottom: 8,
+  },
+  subtitle: {
+    fontSize: 16,
+    color: "#888",
+    textAlign: "center",
+    marginBottom: 32,
+  },
+  input: {
+    backgroundColor: "#1a1a2e",
+    borderRadius: 8,
+    padding: 16,
+    fontSize: 16,
+    color: "#fff",
+    marginBottom: 12,
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  button: {
+    backgroundColor: "#4f8ef7",
+    borderRadius: 8,
+    padding: 16,
+    alignItems: "center",
+    marginTop: 8,
+    marginBottom: 24,
+  },
+  buttonDisabled: {
+    opacity: 0.6,
+  },
+  buttonText: {
+    color: "#fff",
+    fontSize: 16,
+    fontWeight: "600",
+  },
+  errorBox: {
+    backgroundColor: "rgba(255, 69, 58, 0.15)",
+    borderRadius: 8,
+    padding: 12,
+    marginBottom: 16,
+    borderWidth: 1,
+    borderColor: "rgba(255, 69, 58, 0.3)",
+  },
+  errorText: {
+    color: "#ff453a",
+    fontSize: 14,
+    textAlign: "center",
+  },
+  linkText: {
+    color: "#888",
+    textAlign: "center",
+    fontSize: 14,
+  },
+  linkBold: {
+    color: "#4f8ef7",
+    fontWeight: "600",
+  },
+});

mobile/src/screens/RegisterScreen.tsx

@@ -0,0 +1,212 @@
+import { useState, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  TextInput,
+  TouchableOpacity,
+  StyleSheet,
+  Alert,
+  ActivityIndicator,
+  KeyboardAvoidingView,
+  Platform,
+  ScrollView,
+} from "react-native";
+import { useAuth } from "../context/AuthContext";
+import {
+  isValidEmail,
+  validatePasswordStrength,
+} from "@cloud-reader/shared";
+
+export default function RegisterScreen({
+  navigation,
+}: {
+  navigation: any;
+}): ReactNode {
+  const { state, register, clearError } = useAuth();
+  const [username, setUsername] = useState("");
+  const [email, setEmail] = useState("");
+  const [password, setPassword] = useState("");
+  const [confirmPassword, setConfirmPassword] = useState("");
+
+  const handleRegister = async () => {
+    clearError();
+
+    if (!username.trim()) {
+      Alert.alert("Validation Error", "Please enter a username.");
+      return;
+    }
+    if (!email.trim()) {
+      Alert.alert("Validation Error", "Please enter your email.");
+      return;
+    }
+    if (!isValidEmail(email.trim())) {
+      Alert.alert("Validation Error", "Please enter a valid email address.");
+      return;
+    }
+    const passwordError = validatePasswordStrength(password);
+    if (passwordError) {
+      Alert.alert("Validation Error", passwordError);
+      return;
+    }
+    if (password !== confirmPassword) {
+      Alert.alert("Validation Error", "Passwords do not match.");
+      return;
+    }
+
+    try {
+      await register(email.trim(), password, username.trim());
+    } catch {
+      // Error handled in context
+    }
+  };
+
+  return (
+    <KeyboardAvoidingView
+      style={styles.container}
+      behavior={Platform.OS === "ios" ? "padding" : "height"}
+    >
+      <ScrollView contentContainerStyle={styles.inner}>
+        <Text style={styles.title}>Create Account</Text>
+        <Text style={styles.subtitle}>Join Cloud Reader</Text>
+
+        {state.error && (
+          <View style={styles.errorBox}>
+            <Text style={styles.errorText}>{state.error}</Text>
+          </View>
+        )}
+
+        <TextInput
+          style={styles.input}
+          placeholder="Username"
+          placeholderTextColor="#666"
+          value={username}
+          onChangeText={setUsername}
+          autoCapitalize="none"
+          autoCorrect={false}
+        />
+
+        <TextInput
+          style={styles.input}
+          placeholder="Email"
+          placeholderTextColor="#666"
+          value={email}
+          onChangeText={setEmail}
+          keyboardType="email-address"
+          autoCapitalize="none"
+          autoCorrect={false}
+        />
+
+        <TextInput
+          style={styles.input}
+          placeholder="Password"
+          placeholderTextColor="#666"
+          value={password}
+          onChangeText={setPassword}
+          secureTextEntry
+        />
+
+        <TextInput
+          style={styles.input}
+          placeholder="Confirm Password"
+          placeholderTextColor="#666"
+          value={confirmPassword}
+          onChangeText={setConfirmPassword}
+          secureTextEntry
+        />
+
+        <TouchableOpacity
+          style={[styles.button, state.isLoading && styles.buttonDisabled]}
+          onPress={handleRegister}
+          disabled={state.isLoading}
+        >
+          {state.isLoading ? (
+            <ActivityIndicator color="#fff" />
+          ) : (
+            <Text style={styles.buttonText}>Create Account</Text>
+          )}
+        </TouchableOpacity>
+
+        <TouchableOpacity onPress={() => navigation.goBack()}>
+          <Text style={styles.linkText}>
+            Already have an account?{" "}
+            <Text style={styles.linkBold}>Sign In</Text>
+          </Text>
+        </TouchableOpacity>
+      </ScrollView>
+    </KeyboardAvoidingView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+  },
+  inner: {
+    flexGrow: 1,
+    justifyContent: "center",
+    paddingHorizontal: 24,
+    paddingVertical: 48,
+  },
+  title: {
+    fontSize: 28,
+    fontWeight: "bold",
+    color: "#fff",
+    textAlign: "center",
+    marginBottom: 8,
+  },
+  subtitle: {
+    fontSize: 16,
+    color: "#888",
+    textAlign: "center",
+    marginBottom: 32,
+  },
+  input: {
+    backgroundColor: "#1a1a2e",
+    borderRadius: 8,
+    padding: 16,
+    fontSize: 16,
+    color: "#fff",
+    marginBottom: 12,
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  button: {
+    backgroundColor: "#4f8ef7",
+    borderRadius: 8,
+    padding: 16,
+    alignItems: "center",
+    marginTop: 8,
+    marginBottom: 24,
+  },
+  buttonDisabled: {
+    opacity: 0.6,
+  },
+  buttonText: {
+    color: "#fff",
+    fontSize: 16,
+    fontWeight: "600",
+  },
+  errorBox: {
+    backgroundColor: "rgba(255, 69, 58, 0.15)",
+    borderRadius: 8,
+    padding: 12,
+    marginBottom: 16,
+    borderWidth: 1,
+    borderColor: "rgba(255, 69, 58, 0.3)",
+  },
+  errorText: {
+    color: "#ff453a",
+    fontSize: 14,
+    textAlign: "center",
+  },
+  linkText: {
+    color: "#888",
+    textAlign: "center",
+    fontSize: 14,
+  },
+  linkBold: {
+    color: "#4f8ef7",
+    fontWeight: "600",
+  },
+});

mobile/src/screens/SearchScreen.tsx

@@ -0,0 +1,130 @@
+import { useState, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  TextInput,
+  FlatList,
+  TouchableOpacity,
+  StyleSheet,
+  ActivityIndicator,
+} from "react-native";
+import { searchBooks } from "../api/books";
+import type { Book, PaginatedResponse } from "@cloud-reader/shared";
+
+export default function SearchScreen(): ReactNode {
+  const [query, setQuery] = useState("");
+  const [results, setResults] = useState<Book[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [searched, setSearched] = useState(false);
+
+  const handleSearch = async () => {
+    if (!query.trim()) return;
+    setLoading(true);
+    setSearched(true);
+    try {
+      const data: PaginatedResponse<Book> = await searchBooks(query.trim());
+      setResults(data.results);
+    } catch {
+      setResults([]);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const renderBook = ({ item }: { item: Book }) => (
+    <View style={styles.resultCard}>
+      <Text style={styles.resultTitle}>{item.title}</Text>
+      <Text style={styles.resultAuthor}>{item.author}</Text>
+    </View>
+  );
+
+  return (
+    <View style={styles.container}>
+      <View style={styles.searchBar}>
+        <TextInput
+          style={styles.input}
+          placeholder="Search books by title, author..."
+          placeholderTextColor="#666"
+          value={query}
+          onChangeText={setQuery}
+          onSubmitEditing={handleSearch}
+          returnKeyType="search"
+          autoCapitalize="none"
+          autoCorrect={false}
+        />
+      </View>
+
+      {loading && (
+        <View style={styles.centered}>
+          <ActivityIndicator size="large" color="#4f8ef7" />
+        </View>
+      )}
+
+      {!loading && searched && results.length === 0 && (
+        <View style={styles.centered}>
+          <Text style={styles.noResults}>No books found for "{query}"</Text>
+        </View>
+      )}
+
+      <FlatList
+        data={results}
+        renderItem={renderBook}
+        keyExtractor={(item) => item.id}
+        contentContainerStyle={styles.list}
+      />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+  },
+  searchBar: {
+    padding: 16,
+    borderBottomWidth: 1,
+    borderBottomColor: "#333",
+  },
+  input: {
+    backgroundColor: "#1a1a2e",
+    borderRadius: 8,
+    padding: 14,
+    fontSize: 16,
+    color: "#fff",
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  centered: {
+    flex: 1,
+    justifyContent: "center",
+    alignItems: "center",
+    padding: 24,
+  },
+  list: {
+    padding: 16,
+  },
+  resultCard: {
+    backgroundColor: "#1a1a2e",
+    borderRadius: 12,
+    padding: 16,
+    marginBottom: 8,
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  resultTitle: {
+    fontSize: 16,
+    fontWeight: "600",
+    color: "#fff",
+    marginBottom: 4,
+  },
+  resultAuthor: {
+    fontSize: 14,
+    color: "#888",
+  },
+  noResults: {
+    fontSize: 16,
+    color: "#888",
+    textAlign: "center",
+  },
+});

mobile/src/screens/SettingsScreen.tsx

@@ -0,0 +1,91 @@
+import { type ReactNode } from "react";
+import {
+  View,
+  Text,
+  TouchableOpacity,
+  StyleSheet,
+  Alert,
+} from "react-native";
+import { useAuth } from "../context/AuthContext";
+
+export default function SettingsScreen(): ReactNode {
+  const { state, logout } = useAuth();
+
+  const handleLogout = () => {
+    Alert.alert("Logout", "Are you sure you want to sign out?", [
+      { text: "Cancel", style: "cancel" },
+      { text: "Sign Out", style: "destructive", onPress: logout },
+    ]);
+  };
+
+  return (
+    <View style={styles.container}>
+      <View style={styles.section}>
+        <Text style={styles.sectionTitle}>Account</Text>
+        <View style={styles.infoRow}>
+          <Text style={styles.label}>Username</Text>
+          <Text style={styles.value}>{state.user?.username ?? "—"}</Text>
+        </View>
+        <View style={styles.infoRow}>
+          <Text style={styles.label}>Email</Text>
+          <Text style={styles.value}>{state.user?.email ?? "—"}</Text>
+        </View>
+      </View>
+
+      <TouchableOpacity style={styles.logoutButton} onPress={handleLogout}>
+        <Text style={styles.logoutText}>Sign Out</Text>
+      </TouchableOpacity>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+    padding: 16,
+  },
+  section: {
+    backgroundColor: "#1a1a2e",
+    borderRadius: 12,
+    padding: 16,
+    marginBottom: 24,
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  sectionTitle: {
+    fontSize: 18,
+    fontWeight: "600",
+    color: "#fff",
+    marginBottom: 16,
+  },
+  infoRow: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    paddingVertical: 12,
+    borderBottomWidth: 1,
+    borderBottomColor: "#333",
+  },
+  label: {
+    fontSize: 14,
+    color: "#888",
+  },
+  value: {
+    fontSize: 14,
+    color: "#fff",
+    fontWeight: "500",
+  },
+  logoutButton: {
+    backgroundColor: "rgba(255, 69, 58, 0.15)",
+    borderRadius: 8,
+    padding: 16,
+    alignItems: "center",
+    borderWidth: 1,
+    borderColor: "rgba(255, 69, 58, 0.3)",
+  },
+  logoutText: {
+    color: "#ff453a",
+    fontSize: 16,
+    fontWeight: "600",
+  },
+});

mobile/src/types/index.ts

@@ -0,0 +1,8 @@
+// Mobile-specific type aliases and extensions not covered by shared types
+
+export type RootStackParamList = {
+  Auth: undefined;
+  Main: undefined;
+  BookReader: { bookId: number };
+  BookDetail: { bookId: number };
+};

mobile/tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "skipLibCheck": true,
+    "noEmit": true,
+    "forceConsistentCasingInFileNames": true,
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"]
+    }
+  },
+  "include": ["**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
+}

package.json

@@ -4,6 +4,15 @@
   "private": true,
   "workspaces": [
     "frontend",
-    "backend"
+    "backend",
-  ]
+    "mobile",
+    "packages/shared"
+  ],
+  "scripts": {
+    "dev:frontend": "yarn workspace @cloud-reader/frontend dev",
+    "dev:backend": "cd backend && python manage.py runserver",
+    "start:mobile": "yarn workspace @cloud-reader/mobile start",
+    "build:shared": "yarn workspace @cloud-reader/shared build",
+    "install:all": "yarn install"
+  }
 }

packages/shared/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@cloud-reader/shared",
+  "version": "1.0.0",
+  "private": true,
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "build": "tsc",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "typescript": "~5.7.0"
+  }
+}

packages/shared/src/index.ts

@@ -0,0 +1,2 @@
+export * from "./types";
+export * from "./utils";

packages/shared/src/types.ts

@@ -0,0 +1,218 @@
+/** Core domain types for Cloud Reader — shared across web and mobile */
+
+// ---- User & Auth ----
+
+export interface User {
+  id: number;
+  email: string;
+  username: string;
+}
+
+export interface TokenResponse {
+  access: string;
+  refresh: string;
+}
+
+export interface LoginPayload {
+  email: string;
+  password: string;
+}
+
+export interface RegisterPayload {
+  email: string;
+  username: string;
+  password: string;
+  password2: string;
+}
+
+// ---- Books ----
+
+export interface Book {
+  id: string;
+  title: string;
+  author: string;
+  total_pages: number;
+  cover_image: string;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface BookSummary {
+  id: string;
+  title: string;
+  author: string;
+  total_pages: number;
+  cover_image: string;
+}
+
+export interface BookListItem {
+  id: number;
+  title: string;
+  author: string;
+  genre: string;
+  reading_status: string;
+  reading_status_display: string;
+  cover_image: string | null;
+}
+
+export interface BookDetail {
+  id: number;
+  title: string;
+  author: string;
+  genre: string;
+  description: string;
+  reading_status: string;
+  reading_status_display: string;
+  cover_image: string | null;
+  total_pages: number;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface BookSearchParams {
+  q?: string;
+  genre?: string;
+  author?: string;
+  reading_status?: string;
+  ordering?: string;
+  page?: number;
+  page_size?: number;
+}
+
+export const READING_STATUS_OPTIONS = [
+  "to_read",
+  "reading",
+  "finished",
+  "dnf",
+] as const;
+
+// ---- E-Books ----
+
+export interface EBookListItem {
+  id: number;
+  title: string;
+  author: string;
+  filename: string;
+  format: string;
+  page_count: number;
+  cover_image: string | null;
+  created_at: string;
+  progress: number | null;
+}
+
+export interface EBookDetail {
+  id: number;
+  title: string;
+  author: string;
+  filename: string;
+  file_url: string;
+  format: string;
+  page_count: number;
+  file_size: number;
+  metadata_json: Record<string, unknown>;
+  cover_image: string | null;
+  created_at: string;
+  updated_at: string;
+  progress: ReadingProgress | null;
+}
+
+export interface ReadingProgress {
+  current_position: number;
+  last_page: number;
+}
+
+export interface ReadingSettings {
+  font_size: number;
+  font_style: "sans-serif" | "serif" | "monospace";
+  background_color: string;
+}
+
+export interface BookChapter {
+  id: number;
+  title: string;
+  index: number;
+  href: string;
+  children: BookChapter[];
+}
+
+export interface TocResponse {
+  chapters: BookChapter[];
+  format: string;
+  page_count: number;
+}
+
+export interface ContentResponse {
+  page: number;
+  total_pages: number;
+  content: string;
+  chapter_title: string;
+  format: string;
+}
+
+// ---- Bookmarks & Notes ----
+
+export interface Bookmark {
+  id: string;
+  book: string;
+  book_title: string;
+  page: number;
+  location_text: string;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface Note {
+  id: string;
+  book: string;
+  book_title: string;
+  page: number;
+  location_text: string;
+  content: string;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface CreateBookmarkPayload {
+  book: string;
+  page: number;
+  location_text?: string;
+}
+
+export interface CreateNotePayload {
+  book: string;
+  page: number;
+  location_text?: string;
+  content: string;
+}
+
+export interface UpdateNotePayload {
+  content: string;
+}
+
+export type AnnotationKind = "bookmark" | "note";
+
+export interface AnnotationEntry {
+  id: string;
+  kind: AnnotationKind;
+  book_title: string;
+  book_id: string;
+  page: number;
+  location_text: string;
+  content?: string;
+  created_at: string;
+  updated_at: string;
+}
+
+// ---- Generic API shapes ----
+
+export interface PaginatedResponse<T> {
+  count: number;
+  next: string | null;
+  previous: string | null;
+  results: T[];
+}
+
+export interface ApiError {
+  detail?: string;
+  [key: string]: unknown;
+}

packages/shared/src/utils.ts

@@ -0,0 +1,117 @@
+/** Shared utility functions for Cloud Reader */
+
+/**
+ * Format an ISO date string to a human-readable date.
+ */
+export function formatDate(iso: string): string {
+  const date = new Date(iso);
+  return date.toLocaleDateString("en-US", {
+    year: "numeric",
+    month: "short",
+    day: "numeric",
+  });
+}
+
+/**
+ * Format a date as a relative time string (e.g., "2h ago", "3d ago").
+ */
+export function formatRelativeTime(iso: string): string {
+  const now = Date.now();
+  const then = new Date(iso).getTime();
+  const diffMs = now - then;
+  const seconds = Math.floor(diffMs / 1000);
+  const minutes = Math.floor(seconds / 60);
+  const hours = Math.floor(minutes / 60);
+  const days = Math.floor(hours / 24);
+
+  if (days > 0) return `${days}d ago`;
+  if (hours > 0) return `${hours}h ago`;
+  if (minutes > 0) return `${minutes}m ago`;
+  return "just now";
+}
+
+/**
+ * Validate an email address format.
+ */
+export function isValidEmail(email: string): boolean {
+  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
+}
+
+/**
+ * Password strength check:
+ * - At least 8 characters
+ * - At least one uppercase letter
+ * - At least one lowercase letter
+ * - At least one digit
+ */
+export function isStrongPassword(password: string): boolean {
+  return (
+    password.length >= 8 &&
+    /[A-Z]/.test(password) &&
+    /[a-z]/.test(password) &&
+    /\d/.test(password)
+  );
+}
+
+/**
+ * Check if two passwords match.
+ */
+export function doPasswordsMatch(password: string, confirm: string): boolean {
+  return password === confirm;
+}
+
+/**
+ * Get a user-friendly reading status label.
+ */
+export function readingStatusLabel(status: string): string {
+  const labels: Record<string, string> = {
+    to_read: "To Read",
+    reading: "Reading",
+    finished: "Finished",
+    dnf: "Did Not Finish",
+  };
+  return labels[status] ?? status;
+}
+
+/**
+ * Format file size in bytes to a human-readable string.
+ */
+export function formatFileSize(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+}
+
+// ---- API endpoint constants ----
+
+export const API_ENDPOINTS = {
+  auth: {
+    login: "/api/auth/login/",
+    register: "/api/auth/register/",
+    tokenRefresh: "/api/auth/token/refresh/",
+    profile: "/api/auth/profile/",
+  },
+  books: {
+    list: "/api/books/",
+    detail: (id: number | string) => `/api/books/${id}/`,
+    genres: "/api/books/genres/",
+    authors: "/api/books/authors/",
+  },
+  ebooks: {
+    list: "/api/ebooks/",
+    detail: (id: number) => `/api/ebooks/${id}/`,
+    upload: "/api/ebooks/upload/",
+    toc: (id: number) => `/api/ebooks/${id}/toc/`,
+    content: (id: number, page: number) =>
+      `/api/ebooks/${id}/content/?page=${page}`,
+    progress: (id: number) => `/api/ebooks/${id}/progress/`,
+    settings: (id: number) => `/api/ebooks/${id}/settings/`,
+  },
+  annotations: {
+    list: "/api/annotations/",
+    bookmarks: "/api/annotations/bookmarks/",
+    notes: "/api/annotations/notes/",
+    bookmarkDetail: (id: string) => `/api/annotations/bookmarks/${id}/`,
+    noteDetail: (id: string) => `/api/annotations/notes/${id}/`,
+  },
+} as const;

packages/shared/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true
+  },
+  "include": ["src/**/*"]
+}