feat: Integrate Expo mobile application into monorepo (#16)

- Add mobile/ directory with Expo React Native project
- Create API client with JWT auth and token refresh using AsyncStorage
- Implement AuthContext for login/register/logout flow
- Add screens: Login, Register, Library, Search, Settings
- Set up React Navigation with AuthStack and MainTabs
- Create packages/shared/ with shared types and utilities
- Add shared validation utilities (email, password strength)
- Update root package.json workspaces to include mobile + shared
- Add spec document docs/backend/009-expo-integration.md

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.

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/frontend/mobile-search-spec.md

@@ -1,99 +0,0 @@
-# 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/api/books.ts

@@ -1,15 +1,5 @@
 import api from "./client";
-import type {
+import type { ContentResponse, EBookDetail, EBookListItem, ReadingProgress, ReadingSettings, TocResponse } from "../types/book";
-  BookDetail,
-  BookListItem,
-  BookSearchParams,
-  ContentResponse,
-  EBookDetail,
-  EBookListItem,
-  ReadingProgress,
-  ReadingSettings,
-  TocResponse,
-} from "../types/book";
 
 export const booksApi = {
   async getEBooks(): Promise<EBookListItem[]> {
@@ -17,26 +7,6 @@ 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;

frontend/src/components/search/SearchSuggestions.tsx

@@ -1,166 +0,0 @@
-import React, { useCallback, useEffect, useRef, useState } from "react";
-import { useNavigate } from "react-router-dom";
-import { booksApi } from "../../api/books";
-import type { BookListItem } from "../../types/book";
-
-interface SearchSuggestionsProps {
-  query: string;
-  visible: boolean;
-  onClose: () => void;
-  onSelectSuggestion: () => void;
-}
-
-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;
-}
-
-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}
-      style={{
-        position: "absolute",
-        top: "100%",
-        left: 0,
-        right: 0,
-        zIndex: 100,
-        background: "#fff",
-        border: "1px solid #e5e7eb",
-        borderTop: "none",
-        borderRadius: "0 0 10px 10px",
-        boxShadow: "0 8px 24px rgba(0,0,0,0.12)",
-        maxHeight: 320,
-        overflowY: "auto",
-      }}
-    >
-      {loading && (
-        <div style={{ padding: "12px 16px", color: "#9ca3af", fontSize: 13 }}>
-          Searching...
-        </div>
-      )}
-      {!loading && suggestions.length === 0 && debouncedQuery.trim() && (
-        <div style={{ padding: "12px 16px", color: "#9ca3af", fontSize: 13 }}>
-          No quick suggestions
-        </div>
-      )}
-      {suggestions.map((book) => (
-        <div
-          key={book.id}
-          onClick={() => {
-            onSelectSuggestion();
-            navigate(`/books/${book.id}`);
-          }}
-          style={{
-            display: "flex",
-            alignItems: "center",
-            gap: 12,
-            padding: "10px 16px",
-            cursor: "pointer",
-            borderBottom: "1px solid #f3f4f6",
-            minHeight: 44,
-          }}
-          onMouseEnter={(e) => {
-            (e.currentTarget as HTMLElement).style.background = "#f9fafb";
-          }}
-          onMouseLeave={(e) => {
-            (e.currentTarget as HTMLElement).style.background = "";
-          }}
-        >
-          <span style={{ fontSize: 20, flexShrink: 0 }}>
-            {book.cover_image ? (
-              <img
-                src={book.cover_image}
-                alt=""
-                style={{ width: 32, height: 48, objectFit: "cover", borderRadius: 4 }}
-              />
-            ) : (
-              "📖"
-            )}
-          </span>
-          <div style={{ minWidth: 0 }}>
-            <div
-              style={{
-                fontSize: 14,
-                fontWeight: 600,
-                color: "#1f2937",
-                overflow: "hidden",
-                textOverflow: "ellipsis",
-                whiteSpace: "nowrap",
-              }}
-            >
-              {book.title}
-            </div>
-            <div style={{ fontSize: 12, color: "#6b7280", marginTop: 2 }}>
-              {book.author || "Unknown Author"}
-            </div>
-          </div>
-        </div>
-      ))}
-    </div>
-  );
-}

frontend/src/hooks/useMediaQuery.ts

@@ -1,26 +0,0 @@
-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

@@ -1,105 +0,0 @@
-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

@@ -2,7 +2,6 @@ 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 }>();
@@ -10,7 +9,6 @@ export function BookDetailPage() {
   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;
@@ -42,42 +40,12 @@ export function BookDetailPage() {
     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={{ maxWidth: 720, margin: "0 auto", padding: 24, minHeight: "100vh", background: "#f8f9fa" }}>
         <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={{ display: "flex", gap: 24, flexWrap: "wrap" }}>
-          <div style={{
+          <div style={{ width: 240, height: 360, background: "#e5e7eb", borderRadius: 12, flexShrink: 0 }} />
-            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%" }} />
@@ -93,13 +61,13 @@ export function BookDetailPage() {
 
   if (error || !book) {
     return (
-      <div style={containerStyle}>
+      <div style={{ maxWidth: 720, margin: "0 auto", padding: 24, minHeight: "100vh", background: "#f8f9fa" }}>
-        <button onClick={() => navigate("/")} style={backButtonStyle}>← Back to Library</button>
+        <button onClick={() => navigate("/")} className="btn btn-secondary" style={{ marginBottom: 24 }}>← Back to Library</button>
-        <div style={{ textAlign: "center", padding: isMobile ? "60px 16px" : "80px 20px" }}>
+        <div style={{ textAlign: "center", padding: "80px 20px" }}>
-          <div style={{ fontSize: isMobile ? 48 : 64, marginBottom: 16 }}>😕</div>
+          <div style={{ fontSize: 64, marginBottom: 16 }}>😕</div>
-          <h2 style={{ fontSize: isMobile ? 18 : 20, color: "#1f2937", marginBottom: 8 }}>Book not found</h2>
+          <h2 style={{ fontSize: 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>
+          <button onClick={() => void loadBook()} className="btn" style={{ padding: "10px 24px" }}>Retry</button>
         </div>
       </div>
     );
@@ -108,56 +76,57 @@ export function BookDetailPage() {
   const sc = statusColors[book.reading_status] ?? { bg: "#f3f4f6", text: "#6b7280" };
 
   return (
-    <div style={containerStyle}>
+    <div style={{ maxWidth: 720, margin: "0 auto", padding: 24, minHeight: "100vh", background: "#f8f9fa" }}>
       {/* Back button */}
-      <button onClick={() => navigate("/")} style={backButtonStyle}>
+      <button
-        ← {isMobile ? "Back" : "Back to Library"}
+        onClick={() => navigate("/")}
+        style={{
+          display: "inline-flex", alignItems: "center", gap: 4, padding: "8px 16px",
+          borderRadius: 8, border: "1px solid #e5e7eb", background: "#fff",
+          color: "#374151", fontSize: 14, cursor: "pointer", marginBottom: 24,
+        }}
+      >
+        ← Back to Library
       </button>
 
       {/* Book Detail */}
-      <div style={{ display: "flex", gap: isMobile ? 20 : 32, flexDirection: isMobile ? "column" : "row" }}>
+      <div style={{ display: "flex", gap: 32, flexWrap: "wrap" }}>
         {/* Cover */}
-        <div style={{ flexShrink: 0, alignSelf: isMobile ? "center" : "flex-start" }}>
+        <div style={{ flexShrink: 0 }}>
           <div style={{
-            width: isMobile ? 160 : 240,
+            width: 240, height: 360, borderRadius: 12, overflow: "hidden",
-            height: isMobile ? 240 : 360,
+            background: "#f0f0f0", display: "flex", alignItems: "center", justifyContent: "center",
-            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>}
+              : <span style={{ fontSize: 80 }}>📖</span>}
           </div>
         </div>
 
         {/* Info */}
-        <div style={{ flex: 1, minWidth: 0 }}>
+        <div style={{ flex: 1, minWidth: 240 }}>
-          <h1 style={{ fontSize: isMobile ? 22 : 28, fontWeight: 700, color: "#1f2937", marginBottom: 8, lineHeight: 1.2 }}>
+          <h1 style={{ fontSize: 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 }}>
+            <p style={{ fontSize: 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" }}>
+            <span style={{ background: sc.bg, color: sc.text, fontSize: 13, fontWeight: 600, padding: "4px 12px", borderRadius: 999 }}>
               {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" }}>
+              <span style={{ background: "#eef2ff", color: "#4f46e5", fontSize: 13, padding: "4px 12px", borderRadius: 999 }}>
                 {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" }}>
+              <span style={{ background: "#f3f4f6", color: "#6b7280", fontSize: 13, padding: "4px 12px", borderRadius: 999 }}>
                 {book.total_pages} pages
               </span>
             )}
@@ -166,7 +135,7 @@ export function BookDetailPage() {
           {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" }}>
+              <p style={{ fontSize: 15, color: "#4b5563", lineHeight: 1.7, whiteSpace: "pre-wrap" }}>
                 {book.description}
               </p>
             </div>
@@ -179,28 +148,10 @@ export function BookDetailPage() {
             </p>
           </div>
 
-          {/* Mobile full-width back button */}
+          {/* Mobile-only: open in reader if it's an ebook, or just navigate back */}
-          {isMobile && (
+          <div style={{ marginTop: 24, display: "none" }}>
-            <div style={{ marginTop: 24 }}>
+            <button onClick={() => navigate("/")} className="btn btn-block">Back to Library</button>
-              <button
+          </div>
-                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.tsx

@@ -4,9 +4,6 @@ import { booksApi } from "../api/books";
 import type { BookListItem, BookSearchParams } from "../types/book";
 import { READING_STATUS_OPTIONS } from "../types/book";
 import { useAuth } from "../context/AuthContext";
-import { useVoiceSearch } from "../hooks/useVoiceSearch";
-import { useMediaQuery, BREAKPOINTS } from "../hooks/useMediaQuery";
-import { SearchSuggestions } from "../components/search/SearchSuggestions";
 
 interface FilterState {
   genre: string;
@@ -23,15 +20,6 @@ function useDebounce<T>(value: T, delay: number): T {
   return debounced;
 }
 
-/** 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 navigate = useNavigate();
   const { logout } = useAuth();
@@ -45,23 +33,9 @@ export function LibraryPage() {
   const [authors, setAuthors] = useState<string[]>([]);
   const [totalCount, setTotalCount] = useState(0);
   const [showFilters, setShowFilters] = useState(false);
-  const [showSuggestions, setShowSuggestions] = useState(false);
 
   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(() => {
@@ -105,303 +79,114 @@ export function LibraryPage() {
   }, [debouncedSearch, filters, loadBooks]);
 
   const handleFilterChange = (key: keyof FilterState, value: string) => {
-    setFilters((prev: FilterState) => ({ ...prev, [key]: value }));
+    setFilters((prev) => ({ ...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={containerStyle}>
+    <div style={{ maxWidth: 960, margin: "0 auto", padding: 16, minHeight: "100vh", background: "#f8f9fa" }}>
       {/* Header */}
-      <header style={headerStyle}>
+      <header style={{
+        display: "flex", justifyContent: "space-between", alignItems: "center",
+        marginBottom: 20, padding: "16px 0", borderBottom: "1px solid #e5e7eb", flexWrap: "wrap", gap: 8,
+      }}>
         <div>
-          <h1 style={{ fontSize: isMobile ? 20 : 24, fontWeight: 700, color: "#1f2937", margin: 0 }}>Library</h1>
+          <h1 style={{ fontSize: 24, fontWeight: 700, color: "#1f2937", margin: 0 }}>Library</h1>
-          {!loading && (
+          {!loading && <p style={{ fontSize: 13, color: "#6b7280", marginTop: 2 }}>{totalCount} book{totalCount !== 1 ? "s" : ""}</p>}
-            <p style={{ fontSize: 13, color: "#6b7280", marginTop: 2 }}>
-              {totalCount} book{totalCount !== 1 ? "s" : ""}
-            </p>
-          )}
         </div>
-        <div style={{ display: "flex", gap: isMobile ? 4 : 8, flexWrap: "wrap", alignItems: "center" }}>
+        <div style={{ display: "flex", gap: 8, flexWrap: "wrap" }}>
-          {isMobile ? (
+          <button onClick={() => navigate("/add")} className="btn">+ Add Book</button>
-            <>
+          <button onClick={() => navigate("/bookmarks-notes")} className="btn btn-secondary">Bookmarks</button>
-              <button onClick={() => navigate("/add")} style={{ ...TOUCH_TARGET, fontSize: 20, background: "none", border: "none", cursor: "pointer", padding: 8 }} title="Add Book">➕</button>
+          <button onClick={() => navigate("/settings")} className="btn btn-secondary">Settings</button>
-              <button onClick={() => navigate("/bookmarks-notes")} style={{ ...TOUCH_TARGET, fontSize: 20, background: "none", border: "none", cursor: "pointer", padding: 8 }} title="Bookmarks">🔖</button>
+          <button onClick={logout} className="btn btn-danger">Logout</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>
 
       {/* Search Bar */}
       <div style={{ marginBottom: 16 }}>
         <div style={{ display: "flex", gap: 8, alignItems: "center" }}>
-          <div style={searchContainerStyle}>
+          <div style={{ flex: 1, position: "relative" }}>
             <input
-              ref={searchInputRef}
               type="text"
               placeholder="Search by title, author, or genre..."
               value={searchQuery}
-              onChange={(e) => {
+              onChange={(e) => setSearchQuery(e.target.value)}
-                setSearchQuery(e.target.value);
-                setShowSuggestions(true);
-              }}
-              onFocus={() => setShowSuggestions(true)}
               style={{
-                width: "100%",
+                width: "100%", padding: "12px 16px 12px 44px", borderRadius: 10,
-                padding: `12px 16px 12px ${voiceSearch.isSupported ? 44 : 44}px`,
+                border: "1px solid #e5e7eb", fontSize: 15, background: "#fff",
-                paddingRight: voiceSearch.isSupported ? 48 : 16,
+                outline: "none", boxSizing: "border-box",
-                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>
-
-            {/* Voice Search Button */}
-            {voiceSearch.isSupported && (
-              <button
-                onClick={() => {
-                  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={{
+            className={`btn ${showFilters ? "" : "btn-secondary"}`}
-              ...TOUCH_TARGET,
+            title="Toggle filters"
-              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"}
+            {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",
+          background: "#fff", borderRadius: 10, padding: 16, marginBottom: 16,
-          borderRadius: 10,
+          border: "1px solid #e5e7eb", display: "flex", gap: 12, flexWrap: "wrap", alignItems: "end",
-          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 }}>
+          <div style={{ minWidth: 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%",
+                width: "100%", padding: "8px 12px", borderRadius: 6, border: "1px solid #e5e7eb",
-                padding: "8px 12px",
+                fontSize: 14, background: "#fff", cursor: "pointer",
-                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 }}>
+          <div style={{ minWidth: 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%",
+                width: "100%", padding: "8px 12px", borderRadius: 6, border: "1px solid #e5e7eb",
-                padding: "8px 12px",
+                fontSize: 14, background: "#fff", cursor: "pointer",
-                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 }}>
+          <div style={{ minWidth: 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%",
+                width: "100%", padding: "8px 12px", borderRadius: 6, border: "1px solid #e5e7eb",
-                padding: "8px 12px",
+                fontSize: 14, background: "#fff", cursor: "pointer",
-                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
+            <button onClick={clearAllFilters} className="btn btn-secondary" style={{ whiteSpace: "nowrap" }}>
-              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>
           )}
@@ -412,21 +197,16 @@ export function LibraryPage() {
       {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>
+          <button onClick={() => void loadBooks({})} style={{ marginTop: 8, padding: "8px 16px", border: "none", borderRadius: 6, background: "#dc2626", color: "#fff", cursor: "pointer", fontSize: 13 }}>Retry</button>
         </div>
       )}
 
       {/* Loading State */}
       {loading && (
-        <div style={{
+        <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(200px, 1fr))", gap: 16, opacity: 0.6 }}>
-          display: "grid",
+          {Array.from({ length: 8 }).map((_, i) => (
-          gridTemplateColumns: isMobile ? "1fr" : "repeat(auto-fill, minmax(200px, 1fr))",
+            <div key={i} style={{ background: "#fff", borderRadius: 12, overflow: "hidden", boxShadow: "0 2px 8px rgba(0,0,0,0.06)" }}>
-          gap: isMobile ? 12 : 16,
+              <div style={{ height: 180, background: "#f0f0f0" }} />
-          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 }}>
                 <div style={{ height: 14, background: "#f0f0f0", borderRadius: 4, marginBottom: 6, width: "70%" }} />
                 <div style={{ height: 12, background: "#f0f0f0", borderRadius: 4, width: "40%" }} />
@@ -438,9 +218,9 @@ export function LibraryPage() {
 
       {/* Empty State */}
       {!loading && !error && books.length === 0 && (
-        <div style={{ textAlign: "center", padding: isMobile ? "60px 16px" : "80px 20px" }}>
+        <div style={{ textAlign: "center", padding: "80px 20px" }}>
-          <div style={{ fontSize: isMobile ? 48 : 64, marginBottom: 16 }}>{hasActiveFilters ? "🔍" : "📚"}</div>
+          <div style={{ fontSize: 64, marginBottom: 16 }}>{hasActiveFilters ? "🔍" : "📚"}</div>
-          <h2 style={{ fontSize: isMobile ? 18 : 20, color: "#1f2937", marginBottom: 8 }}>
+          <h2 style={{ fontSize: 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 }}>
@@ -449,11 +229,11 @@ export function LibraryPage() {
               : "Add a book to get started building your collection."}
           </p>
           {hasActiveFilters ? (
-            <button onClick={clearAllFilters} className="btn" style={{ padding: "12px 24px", fontSize: 15, minHeight: 44 }}>
+            <button onClick={clearAllFilters} className="btn" style={{ padding: "10px 24px" }}>
               Clear All Filters
             </button>
           ) : (
-            <button onClick={() => navigate("/add")} className="btn" style={{ padding: "12px 24px", fontSize: 15, minHeight: 44 }}>
+            <button onClick={() => navigate("/add")} className="btn" style={{ padding: "10px 24px" }}>
               Add Your First Book
             </button>
           )}
@@ -462,11 +242,7 @@ export function LibraryPage() {
 
       {/* Results Grid */}
       {!loading && books.length > 0 && (
-        <div style={{
+        <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(200px, 1fr))", gap: 16 }}>
-          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" },
@@ -481,14 +257,9 @@ export function LibraryPage() {
                 key={book.id}
                 onClick={() => navigate(`/books/${book.id}`)}
                 style={{
-                  background: "#fff",
+                  background: "#fff", borderRadius: 12, overflow: "hidden",
-                  borderRadius: 12,
+                  boxShadow: "0 2px 8px rgba(0,0,0,0.06)", cursor: "pointer",
-                  overflow: "hidden",
-                  boxShadow: "0 2px 8px rgba(0,0,0,0.06)",
-                  cursor: "pointer",
                   transition: "transform 0.15s, box-shadow 0.15s",
-                  display: isMobile ? "flex" : "block",
-                  minHeight: isMobile ? undefined : undefined,
                 }}
                 onMouseEnter={(e) => {
                   (e.currentTarget as HTMLElement).style.transform = "translateY(-2px)";
@@ -499,59 +270,27 @@ export function LibraryPage() {
                   (e.currentTarget as HTMLElement).style.boxShadow = "0 2px 8px rgba(0,0,0,0.06)";
                 }}
               >
-                <div style={{
+                <div style={{ height: 180, background: "#f0f0f0", display: "flex", alignItems: "center", justifyContent: "center", position: "relative" }}>
-                  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>}
+                    : <span style={{ fontSize: 48 }}>📖</span>}
-                  {!isMobile && (
+                  <span style={{
-                    <span style={{
+                    position: "absolute", top: 8, right: 8,
-                      position: "absolute", top: 8, right: 8,
+                    background: sc.bg, color: sc.text, fontSize: 11, fontWeight: 600,
-                      background: sc.bg, color: sc.text, fontSize: 11, fontWeight: 600,
+                    padding: "2px 8px", borderRadius: 999, lineHeight: "18px",
-                      padding: "2px 8px", borderRadius: 999, lineHeight: "18px",
+                  }}>
-                    }}>
+                    {book.reading_status_display}
-                      {book.reading_status_display}
+                  </span>
-                    </span>
-                  )}
                 </div>
-                <div style={{ padding: isMobile ? "8px 12px" : 12, flex: 1 }}>
+                <div style={{ padding: 12 }}>
-                  <div style={{ display: "flex", alignItems: "flex-start", justifyContent: "space-between", gap: 8 }}>
+                  <h3 style={{ fontSize: 14, fontWeight: 600, color: "#1f2937", marginBottom: 2, overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap" }}>
-                    <div style={{ minWidth: 0, flex: 1 }}>
+                    {book.title}
-                      <h3 style={{
+                  </h3>
-                        fontSize: isMobile ? 14 : 14,
+                  <p style={{ fontSize: 12, color: "#6b7280", marginBottom: 4 }}>
-                        fontWeight: 600,
+                    {book.author || "Unknown Author"}
-                        color: "#1f2937",
+                  </p>
-                        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 }}>
+                    <span style={{ fontSize: 11, color: "#4f46e5", background: "#eef2ff", padding: "1px 6px", borderRadius: 4 }}>
                       {book.genre}
                     </span>
                   )}

frontend/src/types/book.ts

@@ -82,21 +82,3 @@ export interface ContentResponse {
   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" },
-];

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/**/*"]
+}