feat: implement reading pace notifications (US #33)

Backend:
- New hermes app with ReadingGroup, GroupMeeting, GroupMembership models
- NotificationPreference (per-user: enable/disable, frequency daily/weekly)
- PaceNotification model for tracking sent/dismissed notifications
- Pace calculation service comparing current progress vs meeting targets
- API endpoints: pace status, notification preferences CRUD, reminders, dismiss
- Ahead/behind/on_track/completed status determination

Frontend:
- PaceNotification component for in-app alerts (behind/ahead/on_track statuses)
- ReadingPaceBanner — persistent banner in reader view
- Notification settings in Settings page (enable/disable, frequency, reminders)
- API client module (groupsApi) for all notification endpoints

backend/apps/groups/admin.py

@@ -0,0 +1,38 @@
+from django.contrib import admin
+
+from apps.groups.models import (
+    GroupMeeting,
+    GroupMembership,
+    NotificationPreference,
+    PaceNotification,
+    ReadingGroup,
+)
+
+
+@admin.register(ReadingGroup)
+class ReadingGroupAdmin(admin.ModelAdmin):
+    list_display = ["name", "created_by", "created_at"]
+    search_fields = ["name"]
+
+
+@admin.register(GroupMembership)
+class GroupMembershipAdmin(admin.ModelAdmin):
+    list_display = ["user", "group", "role", "joined_at"]
+    list_filter = ["role"]
+
+
+@admin.register(GroupMeeting)
+class GroupMeetingAdmin(admin.ModelAdmin):
+    list_display = ["group", "title", "target_section_label", "scheduled_at"]
+    list_filter = ["group"]
+
+
+@admin.register(NotificationPreference)
+class NotificationPreferenceAdmin(admin.ModelAdmin):
+    list_display = ["user", "pace_notifications_enabled", "reminder_enabled", "frequency"]
+
+
+@admin.register(PaceNotification)
+class PaceNotificationAdmin(admin.ModelAdmin):
+    list_display = ["user", "meeting", "status", "created_at"]
+    list_filter = ["status"]

backend/apps/groups/apps.py

@@ -0,0 +1,8 @@
+from django.apps import AppConfig
+
+
+class GroupsConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "apps.groups"
+    verbose_name = "Reading Groups"
+    label = "groups"

backend/apps/groups/migrations/0001_initial.py

@@ -0,0 +1,109 @@
+# Generated by Django 5.1.7 on 2026-06-20 19:22
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('books', '0003_readingprogress_epub_location'),
+        ('users', '0001_initial'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='NotificationPreference',
+            fields=[
+                ('user', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, primary_key=True, related_name='notification_preference', serialize=False, to=settings.AUTH_USER_MODEL)),
+                ('pace_notifications_enabled', models.BooleanField(default=True)),
+                ('reminder_enabled', models.BooleanField(default=True)),
+                ('frequency', models.CharField(choices=[('daily', 'Daily'), ('weekly', 'Weekly')], default='daily', max_length=16)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': 'Notification Preference',
+                'verbose_name_plural': 'Notification Preferences',
+                'db_table': 'groups_notification_preference',
+            },
+        ),
+        migrations.CreateModel(
+            name='ReadingGroup',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(db_index=True, max_length=256)),
+                ('description', models.TextField(blank=True, default='')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('book', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='reading_groups', to='books.book')),
+                ('created_by', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='created_groups', to=settings.AUTH_USER_MODEL)),
+                ('ebook', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='reading_groups', to='books.ebook')),
+            ],
+            options={
+                'verbose_name': 'Reading Group',
+                'verbose_name_plural': 'Reading Groups',
+                'db_table': 'groups_reading_group',
+                'ordering': ['-created_at'],
+            },
+        ),
+        migrations.CreateModel(
+            name='GroupMeeting',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(blank=True, default='', max_length=512)),
+                ('scheduled_at', models.DateTimeField(db_index=True)),
+                ('target_section', models.PositiveIntegerField(default=0, help_text='Target chapter/section index to reach by this meeting')),
+                ('target_section_label', models.CharField(blank=True, default='', help_text="Human-readable label for the target section (e.g. 'Section 3')", max_length=512)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('group', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='meetings', to='groups.readinggroup')),
+            ],
+            options={
+                'verbose_name': 'Group Meeting',
+                'verbose_name_plural': 'Group Meetings',
+                'db_table': 'groups_meeting',
+                'ordering': ['scheduled_at'],
+            },
+        ),
+        migrations.CreateModel(
+            name='PaceNotification',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('status', models.CharField(choices=[('pending', 'Pending'), ('sent', 'Sent'), ('dismissed', 'Dismissed')], default='pending', max_length=16)),
+                ('current_section', models.PositiveIntegerField(default=0)),
+                ('target_section', models.PositiveIntegerField(default=0)),
+                ('ahead_behind_delta', models.IntegerField(default=0)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('ebook', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='pace_notifications', to='books.ebook')),
+                ('meeting', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='pace_notifications', to='groups.groupmeeting')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='pace_notifications', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'verbose_name': 'Pace Notification',
+                'verbose_name_plural': 'Pace Notifications',
+                'db_table': 'groups_pace_notification',
+                'ordering': ['-created_at'],
+                'indexes': [models.Index(fields=['user', 'meeting', 'ebook'], name='groups_pace_user_id_18e929_idx')],
+            },
+        ),
+        migrations.CreateModel(
+            name='GroupMembership',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('role', models.CharField(choices=[('admin', 'Admin'), ('member', 'Member')], default='member', max_length=16)),
+                ('joined_at', models.DateTimeField(auto_now_add=True)),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='group_memberships', to=settings.AUTH_USER_MODEL)),
+                ('group', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='memberships', to='groups.readinggroup')),
+            ],
+            options={
+                'verbose_name': 'Group Membership',
+                'verbose_name_plural': 'Group Memberships',
+                'db_table': 'groups_membership',
+                'indexes': [models.Index(fields=['user', 'group'], name='groups_memb_user_id_9cda7e_idx')],
+                'unique_together': {('user', 'group')},
+            },
+        ),
+    ]

backend/apps/groups/models.py

@@ -0,0 +1,190 @@
+from __future__ import annotations
+
+from django.conf import settings
+from django.db import models
+
+
+class FrequencyChoice(models.TextChoices):
+    DAILY = "daily", "Daily"
+    WEEKLY = "weekly", "Weekly"
+
+
+class MembershipRole(models.TextChoices):
+    ADMIN = "admin", "Admin"
+    MEMBER = "member", "Member"
+
+
+class NotificationStatus(models.TextChoices):
+    PENDING = "pending", "Pending"
+    SENT = "sent", "Sent"
+    DISMISSED = "dismissed", "Dismissed"
+
+
+class ReadingGroup(models.Model):
+    """A group of users reading a book together with scheduled meetings."""
+
+    name = models.CharField(max_length=256, db_index=True)
+    description = models.TextField(blank=True, default="")
+    book = models.ForeignKey(
+        "books.Book",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="reading_groups",
+    )
+    ebook = models.ForeignKey(
+        "books.EBook",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="reading_groups",
+    )
+    created_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="created_groups",
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        db_table = "groups_reading_group"
+        verbose_name = "Reading Group"
+        verbose_name_plural = "Reading Groups"
+        ordering = ["-created_at"]
+
+    def __str__(self) -> str:
+        return self.name
+
+
+class GroupMembership(models.Model):
+    """User membership in a reading group."""
+
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="group_memberships",
+    )
+    group = models.ForeignKey(
+        ReadingGroup,
+        on_delete=models.CASCADE,
+        related_name="memberships",
+    )
+    role = models.CharField(
+        max_length=16,
+        choices=MembershipRole.choices,
+        default=MembershipRole.MEMBER,
+    )
+    joined_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        db_table = "groups_membership"
+        verbose_name = "Group Membership"
+        verbose_name_plural = "Group Memberships"
+        unique_together = [("user", "group")]
+        indexes = [models.Index(fields=["user", "group"])]
+
+    def __str__(self) -> str:
+        return f"{self.user} in {self.group}"
+
+
+class GroupMeeting(models.Model):
+    """A scheduled meeting for a reading group with a target section."""
+
+    group = models.ForeignKey(
+        ReadingGroup,
+        on_delete=models.CASCADE,
+        related_name="meetings",
+    )
+    title = models.CharField(max_length=512, blank=True, default="")
+    scheduled_at = models.DateTimeField(db_index=True)
+    target_section = models.PositiveIntegerField(
+        default=0,
+        help_text="Target chapter/section index to reach by this meeting",
+    )
+    target_section_label = models.CharField(
+        max_length=512,
+        blank=True,
+        default="",
+        help_text="Human-readable label for the target section (e.g. 'Section 3')",
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        db_table = "groups_meeting"
+        verbose_name = "Group Meeting"
+        verbose_name_plural = "Group Meetings"
+        ordering = ["scheduled_at"]
+
+    def __str__(self) -> str:
+        return f"{self.group.name} — {self.title or self.target_section_label} ({self.scheduled_at.date()})"
+
+
+class NotificationPreference(models.Model):
+    """Per-user notification settings for reading pace alerts."""
+
+    user = models.OneToOneField(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="notification_preference",
+        primary_key=True,
+    )
+    pace_notifications_enabled = models.BooleanField(default=True)
+    reminder_enabled = models.BooleanField(default=True)
+    frequency = models.CharField(
+        max_length=16,
+        choices=FrequencyChoice.choices,
+        default=FrequencyChoice.DAILY,
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        db_table = "groups_notification_preference"
+        verbose_name = "Notification Preference"
+        verbose_name_plural = "Notification Preferences"
+
+    def __str__(self) -> str:
+        return f"{self.user} — pace={'on' if self.pace_notifications_enabled else 'off'}, freq={self.frequency}"
+
+
+class PaceNotification(models.Model):
+    """Tracks reading pace notifications sent to users to avoid duplicates."""
+
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="pace_notifications",
+    )
+    meeting = models.ForeignKey(
+        GroupMeeting,
+        on_delete=models.CASCADE,
+        related_name="pace_notifications",
+    )
+    ebook = models.ForeignKey(
+        "books.EBook",
+        on_delete=models.CASCADE,
+        related_name="pace_notifications",
+        null=True,
+        blank=True,
+    )
+    status = models.CharField(
+        max_length=16,
+        choices=NotificationStatus.choices,
+        default=NotificationStatus.PENDING,
+    )
+    current_section = models.PositiveIntegerField(default=0)
+    target_section = models.PositiveIntegerField(default=0)
+    ahead_behind_delta = models.IntegerField(default=0)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        db_table = "groups_pace_notification"
+        verbose_name = "Pace Notification"
+        verbose_name_plural = "Pace Notifications"
+        ordering = ["-created_at"]
+        indexes = [
+            models.Index(fields=["user", "meeting", "ebook"]),
+        ]
+
+    def __str__(self) -> str:
+        return f"{self.user} — meeting {self.meeting_id}: {self.get_status_display()}"

backend/apps/groups/serializers.py

@@ -0,0 +1,137 @@
+from __future__ import annotations
+
+from rest_framework import serializers
+
+from apps.groups.models import (
+    FrequencyChoice,
+    GroupMeeting,
+    GroupMembership,
+    NotificationPreference,
+    PaceNotification,
+    ReadingGroup,
+)
+from apps.groups.services.pace import PaceStatus
+
+
+class NotificationPreferenceSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = NotificationPreference
+        fields = [
+            "pace_notifications_enabled",
+            "reminder_enabled",
+            "frequency",
+        ]
+
+    def validate_frequency(self, value: str) -> str:
+        valid = {choice[0] for choice in FrequencyChoice.choices}
+        if value not in valid:
+            raise serializers.ValidationError(
+                f"Frequency must be one of: {', '.join(valid)}"
+            )
+        return value
+
+
+class GroupMeetingSerializer(serializers.ModelSerializer):
+    group_name = serializers.CharField(source="group.name", read_only=True)
+
+    class Meta:
+        model = GroupMeeting
+        fields = [
+            "id",
+            "group",
+            "group_name",
+            "title",
+            "scheduled_at",
+            "target_section",
+            "target_section_label",
+            "created_at",
+        ]
+        read_only_fields = ["id", "created_at"]
+
+    def validate_target_section(self, value: int) -> int:
+        if value < 0:
+            raise serializers.ValidationError("Target section must be non-negative.")
+        return value
+
+
+class ReadingGroupSerializer(serializers.ModelSerializer):
+    member_count = serializers.SerializerMethodField()
+    meeting_count = serializers.SerializerMethodField()
+
+    class Meta:
+        model = ReadingGroup
+        fields = [
+            "id",
+            "name",
+            "description",
+            "book",
+            "ebook",
+            "created_by",
+            "created_at",
+            "member_count",
+            "meeting_count",
+        ]
+        read_only_fields = ["id", "created_by", "created_at"]
+
+    def get_member_count(self, obj: ReadingGroup) -> int:
+        return obj.memberships.count()
+
+    def get_meeting_count(self, obj: ReadingGroup) -> int:
+        return obj.meetings.count()
+
+
+class GroupMembershipSerializer(serializers.ModelSerializer):
+    user_email = serializers.CharField(source="user.email", read_only=True)
+    group_name = serializers.CharField(source="group.name", read_only=True)
+
+    class Meta:
+        model = GroupMembership
+        fields = ["id", "user", "user_email", "group", "group_name", "role", "joined_at"]
+        read_only_fields = ["id", "joined_at"]
+
+
+class PaceNotificationSerializer(serializers.ModelSerializer):
+    status_display = serializers.CharField(source="get_status_display", read_only=True)
+
+    class Meta:
+        model = PaceNotification
+        fields = [
+            "id",
+            "user",
+            "meeting",
+            "ebook",
+            "status",
+            "status_display",
+            "current_section",
+            "target_section",
+            "ahead_behind_delta",
+            "created_at",
+        ]
+        read_only_fields = ["id", "created_at"]
+
+
+class PaceStatusSerializer(serializers.Serializer):
+    meeting_id = serializers.IntegerField()
+    meeting_title = serializers.CharField()
+    scheduled_at = serializers.CharField()
+    target_section = serializers.IntegerField()
+    target_section_label = serializers.CharField()
+    current_section = serializers.IntegerField()
+    ahead_behind_delta = serializers.IntegerField()
+    status = serializers.CharField()
+    days_until_meeting = serializers.IntegerField()
+    sections_to_catch_up = serializers.IntegerField()
+    ebook_id = serializers.IntegerField()
+    ebook_title = serializers.CharField()
+
+
+class ReminderSerializer(serializers.Serializer):
+    meeting_id = serializers.IntegerField()
+    meeting_title = serializers.CharField()
+    scheduled_at = serializers.CharField()
+    target_section = serializers.IntegerField()
+    target_section_label = serializers.CharField()
+    group_name = serializers.CharField()
+    hours_until = serializers.IntegerField()
+    ebook_id = serializers.IntegerField()
+    ebook_title = serializers.CharField()

backend/apps/groups/services/pace.py

@@ -0,0 +1,219 @@
+"""Pace calculation service for reading progress vs meeting targets."""
+
+from __future__ import annotations
+
+import logging
+from datetime import datetime, timedelta
+from typing import TypedDict
+
+from django.db.models import QuerySet
+from django.utils import timezone
+
+from apps.books.models import EBook, ReadingProgress
+from apps.groups.models import (
+    GroupMeeting,
+    GroupMembership,
+    NotificationPreference,
+    PaceNotification,
+    NotificationStatus,
+)
+
+logger = logging.getLogger(__name__)
+
+
+class PaceStatus(TypedDict):
+    meeting_id: int
+    meeting_title: str
+    scheduled_at: str
+    target_section: int
+    target_section_label: str
+    current_section: int
+    ahead_behind_delta: int
+    status: str  # "ahead", "behind", "on_track", "completed"
+    days_until_meeting: int
+    sections_to_catch_up: int
+    ebook_id: int
+    ebook_title: str
+
+
+def get_relevant_ebooks_for_user(user) -> QuerySet[EBook]:
+    """Return ebooks that belong to groups the user is a member of."""
+    group_ids = (
+        GroupMembership.objects.filter(user=user)
+        .values_list("group_id", flat=True)
+    )
+    return (
+        EBook.objects.filter(reading_groups__in=group_ids)
+        .select_related("reading_progress")
+        .prefetch_related("chapters")
+        .distinct()
+    )
+
+
+def calculate_pace(
+    user,
+    ebook: EBook | None = None,
+    meeting: GroupMeeting | None = None,
+) -> list[PaceStatus]:
+    """Calculate reading pace for a user's upcoming meetings.
+
+    Compares the user's current reading progress (chapter index) against
+    the target section for each upcoming meeting within 3 days.
+    """
+    now = timezone.now()
+    three_days_from_now = now + timedelta(days=3)
+
+    # Find upcoming meetings for groups the user belongs to
+    user_group_ids = (
+        GroupMembership.objects.filter(user=user)
+        .values_list("group_id", flat=True)
+    )
+    meetings_qs = GroupMeeting.objects.filter(
+        group_id__in=user_group_ids,
+        scheduled_at__gte=now,
+        scheduled_at__lte=three_days_from_now,
+    ).select_related("group", "group__ebook")
+
+    if meeting:
+        meetings_qs = meetings_qs.filter(pk=meeting.pk)
+
+    meetings = list(meetings_qs)
+
+    results: list[PaceStatus] = []
+
+    for m in meetings:
+        group_ebook = m.group.ebook
+        ebooks_to_check: list[EBook] = []
+
+        if ebook:
+            ebooks_to_check = [ebook]
+        elif group_ebook:
+            ebooks_to_check = [group_ebook]
+        else:
+            # Check all ebooks in the group
+            ebooks_to_check = list(
+                EBook.objects.filter(reading_groups=m.group)
+                .select_related("reading_progress")
+                .prefetch_related("chapters")
+            )
+
+        for eb in ebooks_to_check:
+            pace = _compute_single_pace(user, m, eb, now)
+            if pace:
+                results.append(pace)
+
+    return results
+
+
+def _compute_single_pace(
+    user,
+    meeting: GroupMeeting,
+    ebook: EBook,
+    now: datetime,
+) -> PaceStatus | None:
+    """Compute pace for one user + meeting + ebook combination."""
+    try:
+        progress = ebook.reading_progress
+    except ReadingProgress.DoesNotExist:
+        # No progress yet — user hasn't started reading
+        return None
+
+    # Current section: based on last_page (chapter index) or computed from progress %
+    if progress.last_page > 0:
+        current_section = progress.last_page
+    elif progress.current_position > 0:
+        chapter_count = ebook.chapters.count() or ebook.page_count or 1
+        current_section = max(1, int((progress.current_position / 100) * chapter_count))
+    else:
+        current_section = 0
+
+    target_section = meeting.target_section or 0
+    if target_section == 0:
+        return None
+
+    delta = current_section - target_section
+    days_until = max(0, (meeting.scheduled_at - now).days)
+
+    if current_section >= target_section:
+        if current_section >= target_section and progress.current_position > 0:
+            status = "completed"
+        else:
+            status = "ahead"
+    elif delta >= -1:
+        status = "on_track"
+    else:
+        status = "behind"
+
+    return PaceStatus(
+        meeting_id=meeting.pk,
+        meeting_title=meeting.title or meeting.target_section_label,
+        scheduled_at=meeting.scheduled_at.isoformat(),
+        target_section=target_section,
+        target_section_label=meeting.target_section_label,
+        current_section=current_section,
+        ahead_behind_delta=delta,
+        status=status,
+        days_until_meeting=days_until,
+        sections_to_catch_up=max(0, target_section - current_section),
+        ebook_id=ebook.pk,
+        ebook_title=ebook.title,
+    )
+
+
+def should_send_notification(
+    user,
+    meeting: GroupMeeting,
+    ebook: EBook,
+) -> bool:
+    """Check if a pace notification should be sent based on user preferences."""
+    pref, _ = NotificationPreference.objects.get_or_create(user=user)
+
+    if not pref.pace_notifications_enabled:
+        return False
+
+    # Check if notification was already sent today
+    today = timezone.now().date()
+    existing = PaceNotification.objects.filter(
+        user=user,
+        meeting=meeting,
+        ebook=ebook,
+        created_at__date=today,
+    ).exclude(status=NotificationStatus.DISMISSED)
+
+    if existing.exists():
+        return False
+
+    # Frequency check
+    if pref.frequency == "weekly":
+        week_ago = today - timedelta(days=7)
+        recent = PaceNotification.objects.filter(
+            user=user,
+            meeting=meeting,
+            ebook=ebook,
+            created_at__date__gte=week_ago,
+        ).exclude(status=NotificationStatus.DISMISSED)
+        if recent.exists():
+            return False
+
+    return True
+
+
+def get_reminder_meetings(user) -> list[GroupMeeting]:
+    """Get meetings that are within 24 hours for reminder notifications."""
+    now = timezone.now()
+    tomorrow = now + timedelta(days=1)
+
+    user_group_ids = (
+        GroupMembership.objects.filter(user=user)
+        .values_list("group_id", flat=True)
+    )
+
+    return list(
+        GroupMeeting.objects.filter(
+            group_id__in=user_group_ids,
+            scheduled_at__gte=now,
+            scheduled_at__lte=tomorrow,
+        )
+        .select_related("group", "group__ebook")
+        .order_by("scheduled_at")
+    )

backend/apps/groups/urls.py

@@ -0,0 +1,23 @@
+from django.urls import include, path
+from rest_framework.routers import DefaultRouter
+
+from apps.groups.views import (
+    GroupMeetingViewSet,
+    ReadingGroupViewSet,
+    dismiss_pace_notification_view,
+    notification_preferences_view,
+    pace_status_view,
+    reminder_view,
+)
+
+router = DefaultRouter()
+router.register(r"groups", ReadingGroupViewSet, basename="reading-group")
+router.register(r"meetings", GroupMeetingViewSet, basename="group-meeting")
+
+urlpatterns = [
+    path("", include(router.urls)),
+    path("notifications/preferences/", notification_preferences_view, name="notification-preferences"),
+    path("notifications/pace/", pace_status_view, name="pace-status"),
+    path("notifications/dismiss/", dismiss_pace_notification_view, name="dismiss-pace"),
+    path("notifications/reminders/", reminder_view, name="meeting-reminders"),
+]

backend/apps/groups/views.py

@@ -0,0 +1,207 @@
+from __future__ import annotations
+
+from django.db.models import QuerySet
+from rest_framework import permissions, status, viewsets
+from rest_framework.decorators import action, api_view, permission_classes
+from rest_framework.permissions import IsAuthenticated
+from rest_framework.request import Request
+from rest_framework.response import Response
+
+from apps.books.models import EBook
+from apps.groups.models import (
+    GroupMeeting,
+    GroupMembership,
+    NotificationPreference,
+    PaceNotification,
+    NotificationStatus,
+    ReadingGroup,
+)
+from apps.groups.serializers import (
+    GroupMeetingSerializer,
+    GroupMembershipSerializer,
+    NotificationPreferenceSerializer,
+    PaceNotificationSerializer,
+    PaceStatusSerializer,
+    ReadingGroupSerializer,
+    ReminderSerializer,
+)
+from apps.groups.services.pace import (
+    calculate_pace,
+    get_reminder_meetings,
+    should_send_notification,
+)
+
+
+class IsGroupMember(permissions.BasePermission):
+    """Only allow group members to access group resources."""
+
+    def has_object_permission(self, request: Request, view: object, obj: ReadingGroup) -> bool:
+        return obj.memberships.filter(user=request.user).exists()
+
+
+class ReadingGroupViewSet(viewsets.ModelViewSet):
+    permission_classes = [IsAuthenticated, IsGroupMember]
+    serializer_class = ReadingGroupSerializer
+
+    def get_queryset(self) -> QuerySet[ReadingGroup]:
+        return (
+            ReadingGroup.objects.filter(memberships__user=self.request.user)
+            .prefetch_related("memberships", "meetings")
+            .distinct()
+        )
+
+    def perform_create(self, serializer) -> None:
+        group = serializer.save(created_by=self.request.user)
+        GroupMembership.objects.create(
+            user=self.request.user,
+            group=group,
+            role="admin",
+        )
+
+    @action(detail=False, methods=["get"], url_path="all")
+    def all_groups(self, request: Request) -> Response:
+        """Return all groups (for discovery)."""
+        qs = ReadingGroup.objects.all().prefetch_related("memberships", "meetings")
+        page = self.paginate_queryset(qs)
+        if page is not None:
+            serializer = self.get_serializer(page, many=True)
+            return self.get_paginated_response(serializer.data)
+        serializer = self.get_serializer(qs, many=True)
+        return Response(serializer.data)
+
+
+class GroupMeetingViewSet(viewsets.ModelViewSet):
+    permission_classes = [IsAuthenticated]
+    serializer_class = GroupMeetingSerializer
+
+    def get_queryset(self) -> QuerySet[GroupMeeting]:
+        user_group_ids = (
+            GroupMembership.objects.filter(user=self.request.user)
+            .values_list("group_id", flat=True)
+        )
+        return GroupMeeting.objects.filter(group_id__in=user_group_ids).select_related(
+            "group"
+        )
+
+    def perform_create(self, serializer) -> None:
+        group = serializer.validated_data["group"]
+        if not group.memberships.filter(user=self.request.user).exists():
+            raise permissions.PermissionDenied("You must be a group member to create meetings.")
+        serializer.save()
+
+    @action(detail=False, methods=["get"], url_path="upcoming")
+    def upcoming(self, request: Request) -> Response:
+        """Return upcoming meetings for the user's groups (within 3 days)."""
+        from django.utils import timezone
+        from datetime import timedelta
+
+        now = timezone.now()
+        three_days = now + timedelta(days=3)
+        qs = self.get_queryset().filter(
+            scheduled_at__gte=now,
+            scheduled_at__lte=three_days,
+        )
+        serializer = self.get_serializer(qs, many=True)
+        return Response(serializer.data)
+
+
+@api_view(["GET", "PATCH"])
+@permission_classes([IsAuthenticated])
+def notification_preferences_view(request: Request) -> Response:
+    """Get or update notification preferences for the current user."""
+    pref, _created = NotificationPreference.objects.get_or_create(user=request.user)
+
+    if request.method == "GET":
+        serializer = NotificationPreferenceSerializer(pref)
+        return Response(serializer.data)
+
+    serializer = NotificationPreferenceSerializer(pref, data=request.data, partial=True)
+    serializer.is_valid(raise_exception=True)
+    serializer.save()
+    return Response(serializer.data)
+
+
+@api_view(["GET"])
+@permission_classes([IsAuthenticated])
+def pace_status_view(request: Request) -> Response:
+    """Get reading pace status for the current user's upcoming meetings."""
+    ebook_id = request.query_params.get("ebook_id")
+    ebook: EBook | None = None
+
+    if ebook_id:
+        try:
+            ebook = EBook.objects.select_related("reading_progress").prefetch_related("chapters").get(
+                pk=ebook_id, user=request.user
+            )
+        except EBook.DoesNotExist:
+            return Response(
+                {"error": "EBook not found."}, status=status.HTTP_404_NOT_FOUND
+            )
+
+    pace_data = calculate_pace(request.user, ebook=ebook)
+    serializer = PaceStatusSerializer(pace_data, many=True)
+    return Response(serializer.data)
+
+
+@api_view(["POST"])
+@permission_classes([IsAuthenticated])
+def dismiss_pace_notification_view(request: Request) -> Response:
+    """Dismiss a pace notification so it won't show again."""
+    meeting_id = request.data.get("meeting_id")
+    ebook_id = request.data.get("ebook_id")
+
+    if not meeting_id or not ebook_id:
+        return Response(
+            {"error": "meeting_id and ebook_id are required."},
+            status=status.HTTP_400_BAD_REQUEST,
+        )
+
+    PaceNotification.objects.filter(
+        user=request.user,
+        meeting_id=meeting_id,
+        ebook_id=ebook_id,
+        status=NotificationStatus.PENDING,
+    ).update(status=NotificationStatus.DISMISSED)
+
+    return Response({"status": "dismissed"})
+
+
+@api_view(["GET"])
+@permission_classes([IsAuthenticated])
+def reminder_view(request: Request) -> Response:
+    """Get pre-meeting reminders for meetings within 24 hours."""
+    pref, _ = NotificationPreference.objects.get_or_create(user=request.user)
+    if not pref.reminder_enabled:
+        return Response([])
+
+    meetings = get_reminder_meetings(request.user)
+    now_dt = __import__("django").utils.timezone.now()
+
+    reminders = []
+    for mtg in meetings:
+        group_ebook = mtg.group.ebook
+        ebook: EBook | None = group_ebook
+        if not ebook:
+            ebooks = list(
+                EBook.objects.filter(reading_groups=mtg.group).select_related("reading_progress")[:1]
+            )
+            ebook = ebooks[0] if ebooks else None
+
+        if not ebook:
+            continue
+
+        hours_until = max(0, int((mtg.scheduled_at - now_dt).total_seconds() / 3600))
+        reminders.append({
+            "meeting_id": mtg.pk,
+            "meeting_title": mtg.title or mtg.target_section_label,
+            "scheduled_at": mtg.scheduled_at.isoformat(),
+            "target_section": mtg.target_section,
+            "target_section_label": mtg.target_section_label,
+            "group_name": mtg.group.name,
+            "hours_until": hours_until,
+            "ebook_id": ebook.pk,
+            "ebook_title": ebook.title,
+        })
+
+    serializer = ReminderSerializer(reminders, many=True)
+    return Response(serializer.data)

backend/config/django.py

@@ -41,6 +41,7 @@ INSTALLED_APPS = [
     "apps.books",
     "apps.annotations",
     "apps.reader",
+    "apps.groups",
 ]
 
 MIDDLEWARE = [

backend/config/urls.py

@@ -8,6 +8,7 @@ urlpatterns = [
     path("api/books/", include("apps.books.urls")),
     path("api/annotations/", include("apps.annotations.urls")),
     path("api/reader/", include("apps.reader.urls")),
+    path("api/groups/", include("apps.groups.urls")),
 ]
 
 if settings.DEBUG:

docs/mobile/010-mobile-reader.md

@@ -0,0 +1,150 @@
+# 010 — Mobile EPUB Reader
+
+**Status:** Implemented
+**Created:** 2026-06-04
+
+## Objective
+
+Mirror the web reading experience (`frontend/src/pages/ReadingPage.tsx` and
+`frontend/src/components/reader/*`) inside the Expo app so users can open their
+uploaded library, read EPUBs with persisted progress and typography settings,
+and manage bookmarks/highlights — reusing the same Django REST API as the web
+client.
+
+The web EPUB renderer (`react-reader` / epub.js) is DOM-only, so mobile renders
+EPUBs with `@epubjs-react-native/core`, which runs epub.js inside a
+`react-native-webview`. This keeps behavior (CFI locations, themes, font
+controls, TOC, annotations) close to web while staying inside the managed Expo
+workflow.
+
+## Scope
+
+### Mirrored from web
+
+- EPUB rendering with swipe pagination (`flow: "paginated"`).
+- Resume position and debounced progress save (CFI + percentage).
+- Table of contents drawer with jump-to-chapter.
+- Reading settings: theme presets (light/sepia/paper/dark), font family, font
+  size, line spacing — persisted to `/api/reader/settings/`.
+- Bookmarks: bookmark the current page, list/jump/delete, and create highlights
+  from a text selection. Highlights are re-applied on open (best-effort).
+
+### Deferred (not in this pass)
+
+- PDF reading. PDF books show a placeholder pointing to the web reader.
+- Brightness and orientation-lock controls.
+- Per-highlight color picker (highlights use a single default color).
+- App-wide internationalization (web uses `react-i18n-lite`).
+
+## Architecture
+
+```
+LibraryScreen (EBook list)
+        |  navigate("BookDetail", { ebookId })
+        v
+BookDetailScreen ----------------> ReaderScreen ({ ebookId })
+                                        |
+                       GET /api/books/ebooks/:id/  (format guard)
+                                        |
+                       epub? --------------------- pdf? -> placeholder
+                          |
+                EpubReaderView (ReaderProvider)
+                          |
+   expo-file-system downloadAsync(file/, Bearer token) -> file:// uri
+                          |
+   <Reader src=file:// fileSystem=useFileSystem flow="paginated" />
+                          |
+   onLocationChange -> debounce 800ms -> PATCH progress/
+   onSelected       -> POST bookmarks/ (+ highlight annotation)
+   useReader().toc  -> goToLocation(href)
+   settings change  -> changeTheme / changeFontSize / changeFontFamily
+                       + PATCH /api/reader/settings/ (debounced)
+```
+
+The ebook file is downloaded to the app cache with an `Authorization` header
+(the `/file/` endpoint is JWT-protected) and the local `file://` URI is handed
+to the renderer — mirroring how the web client downloads a blob rather than
+using a public/signed URL.
+
+## Mobile changes
+
+| File | Role |
+|------|------|
+| `mobile/src/api/client.ts` | Adds `apiClient`, `saveTokens`, `loadTokens`, `getApiBaseUrl` |
+| `mobile/src/api/ebooks.ts` | `/api/books/ebooks/` list/detail/toc + `getFileUrl(id)` |
+| `mobile/src/api/reader.ts` | Reader settings + per-book progress (mirrors web `api/reader.ts`) |
+| `mobile/src/api/annotations.ts` | Bookmarks CRUD against `/api/annotations/bookmarks/` |
+| `mobile/src/types/reader.ts` | `ReadingSettings`, `ReadingProgress` (full reader shapes) |
+| `mobile/src/types/index.ts` | `AppStackParamList`, `Bookmark`, `CreateMarkerPayload` |
+| `mobile/src/hooks/useReadingSettings.ts` | Loads + debounced-saves reader settings |
+| `mobile/src/utils/epubTheme.ts` | Font stacks, theme palettes, `buildEpubTheme()` |
+| `mobile/src/navigation/AppStack.tsx` | Native stack: Tabs / BookDetail / Reader |
+| `mobile/src/screens/LibraryScreen.tsx` | Lists user EBooks (`ebooksApi.list`) |
+| `mobile/src/screens/BookDetailScreen.tsx` | Metadata + start/resume button |
+| `mobile/src/screens/ReaderScreen.tsx` | Format guard: EPUB view vs PDF placeholder |
+| `mobile/src/components/reader/EpubReaderView.tsx` | Reader, progress, bookmarks, settings wiring |
+| `mobile/src/components/reader/ReaderToolbar.tsx` | Title, chapter, progress bar, action buttons |
+| `mobile/src/components/reader/TocModal.tsx` | Table of contents sheet |
+| `mobile/src/components/reader/ReadingSettingsModal.tsx` | Theme/font/size/spacing controls |
+| `mobile/src/components/reader/BookmarksModal.tsx` | Bookmarks & highlights list |
+| `mobile/App.tsx` | Wraps the tree in `GestureHandlerRootView` |
+
+Removed unused scaffolding: `mobile/src/navigation/AppNavigator.tsx`,
+`mobile/src/navigation/MainTabs.tsx`.
+
+## API contracts (consumed)
+
+| Method | Path | Purpose |
+|--------|------|---------|
+| GET | `/api/books/ebooks/` | User library list |
+| GET | `/api/books/ebooks/:id/` | EBook detail (format, progress, cover) |
+| GET | `/api/books/ebooks/:id/file/` | Stream EPUB bytes (JWT, owner) |
+| GET/PATCH | `/api/books/ebooks/:id/progress/` | Reading progress (`current_position`, `last_page`, `epub_location`) |
+| GET/PATCH | `/api/reader/settings/` | Reader typography/theme settings |
+| GET/POST/DELETE | `/api/annotations/bookmarks/` | Bookmarks & highlights (`ebook`, `epub_cfi`, `chapter_index`, ...) |
+
+## Settings mapping (web -> mobile)
+
+| Reader setting | Web (epub.js) | Mobile (`@epubjs-react-native/core`) |
+|----------------|---------------|--------------------------------------|
+| `theme` / colors | `themes.register/select` | `changeTheme(buildEpubTheme())` + `defaultTheme` |
+| `font_size` | `themes.fontSize` | `changeFontSize("Npx")` |
+| `font_family` | body font-family | `changeFontFamily(stack)` |
+| `line_height` | body line-height | `buildEpubTheme()` CSS rule |
+| `margin_width` | gap-based padding | not applied (deferred) |
+| `brightness` / `orientation_lock` | applied on web | deferred |
+
+## Dependencies added
+
+- `@epubjs-react-native/core@1.4.7`
+- `@epubjs-react-native/expo-file-system@1.1.4`
+- `react-native-webview@13.12.5`
+
+(`react-native-gesture-handler`, `react-native-reanimated`, and
+`expo-file-system` were already present.)
+
+## Configuration
+
+| Env var | Purpose |
+|---------|---------|
+| `EXPO_PUBLIC_API_URL` | Backend base URL (e.g. `http://10.0.2.2:8000` on Android emulator, LAN IP on a device) |
+
+## Compatibility notes
+
+- The Expo file-system adapter (`@epubjs-react-native/expo-file-system`) depends
+  only on `expo-file-system`, so the reader runs in Expo Go. (The library's
+  bare adapter pulls native `@dr.pogodin/react-native-fs`; that path is not
+  used here.)
+- React 19 / Expo SDK 52 may surface peer-dependency warnings for the
+  `@epubjs-react-native/*` packages.
+
+## Verification
+
+- [ ] Log in; Library lists the user's uploaded EBooks with covers/progress.
+- [ ] Open an EPUB; it renders and paginates by swipe.
+- [ ] Reopen a book; it resumes at the last position.
+- [ ] Change theme/font/size/spacing; the page updates and persists across reopen.
+- [ ] Open the TOC and jump to a chapter.
+- [ ] Bookmark the current page; it appears in the bookmarks list and can be re-opened/deleted.
+- [ ] Select text to create a highlight; it persists and re-renders on reopen.
+- [ ] Open a PDF book; the placeholder is shown instead of a crash.

frontend/src/api/groups.ts

@@ -0,0 +1,57 @@
+import api from "./client";
+import type {
+  GroupMeeting,
+  MeetingReminder,
+  NotificationPreferences,
+  PaceStatus,
+  ReadingGroup,
+} from "../types/notifications";
+
+export const groupsApi = {
+  async getPaceStatus(ebookId?: number): Promise<PaceStatus[]> {
+    const params: Record<string, string> = {};
+    if (ebookId) params.ebook_id = String(ebookId);
+    const { data } = await api.get<PaceStatus[]>("/groups/notifications/pace/", { params });
+    return data;
+  },
+
+  async getPreferences(): Promise<NotificationPreferences> {
+    const { data } = await api.get<NotificationPreferences>("/groups/notifications/preferences/");
+    return data;
+  },
+
+  async updatePreferences(
+    prefs: Partial<NotificationPreferences>,
+  ): Promise<NotificationPreferences> {
+    const { data } = await api.patch<NotificationPreferences>(
+      "/groups/notifications/preferences/",
+      prefs,
+    );
+    return data;
+  },
+
+  async dismissPaceNotification(meetingId: number, ebookId: number): Promise<void> {
+    await api.post("/groups/notifications/dismiss/", {
+      meeting_id: meetingId,
+      ebook_id: ebookId,
+    });
+  },
+
+  async getReminders(): Promise<MeetingReminder[]> {
+    const { data } = await api.get<MeetingReminder[]>("/groups/notifications/reminders/");
+    return data;
+  },
+
+  async getGroups(): Promise<ReadingGroup[]> {
+    const { data } = await api.get<{ count: number; results: ReadingGroup[] } | ReadingGroup[]>(
+      "/groups/groups/",
+    );
+    if (Array.isArray(data)) return data;
+    return data.results ?? [];
+  },
+
+  async getUpcomingMeetings(): Promise<GroupMeeting[]> {
+    const { data } = await api.get<GroupMeeting[]>("/groups/meetings/upcoming/");
+    return data;
+  },
+};

frontend/src/components/notifications/PaceNotification.tsx

@@ -0,0 +1,119 @@
+import { useEffect, useState } from "react";
+import { useTranslation } from "react-i18n-lite";
+import { groupsApi } from "../api/groups";
+import type { PaceStatus } from "../types/notifications";
+
+interface PaceNotificationProps {
+  ebookId?: number;
+}
+
+export function PaceNotification({ ebookId }: PaceNotificationProps) {
+  const { t } = useTranslation();
+  const [paceItems, setPaceItems] = useState<PaceStatus[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [dismissed, setDismissed] = useState<Set<string>>(new Set());
+
+  useEffect(() => {
+    const load = async () => {
+      try {
+        const data = await groupsApi.getPaceStatus(ebookId);
+        setPaceItems(data);
+      } catch {
+        // Silently fail — notifications are non-critical
+      } finally {
+        setLoading(false);
+      }
+    };
+    void load();
+  }, [ebookId]);
+
+  const handleDismiss = async (meetingId: number, itemEbookId: number) => {
+    const key = `${meetingId}-${itemEbookId}`;
+    setDismissed((prev) => new Set(prev).add(key));
+    try {
+      await groupsApi.dismissPaceNotification(meetingId, itemEbookId);
+    } catch {
+      // Best effort dismissal
+    }
+  };
+
+  if (loading || paceItems.length === 0) return null;
+
+  const visibleItems = paceItems.filter(
+    (p) => !dismissed.has(`${p.meeting_id}-${p.ebook_id}`),
+  );
+  if (visibleItems.length === 0) return null;
+
+  return (
+    <div style={{ display: "flex", flexDirection: "column", gap: 8, padding: "12px 0" }}>
+      {visibleItems.map((item) => {
+        const isBehind = item.status === "behind";
+        const isAhead = item.status === "ahead" || item.status === "completed";
+        const isOnTrack = item.status === "on_track";
+
+        const bgColor = isBehind ? "#fde8e8" : isAhead ? "#d4edda" : "#e8f4fd";
+        const borderColor = isBehind ? "#e74c3c" : isAhead ? "#27ae60" : "#3498db";
+        const textColor = isBehind ? "#a71d2a" : isAhead ? "#155724" : "#0c5460";
+
+        return (
+          <div
+            key={`${item.meeting_id}-${item.ebook_id}`}
+            style={{
+              background: bgColor,
+              border: `1px solid ${borderColor}`,
+              borderRadius: 8,
+              padding: "12px 16px",
+              display: "flex",
+              alignItems: "flex-start",
+              justifyContent: "space-between",
+              gap: 12,
+            }}
+          >
+            <div style={{ flex: 1 }}>
+              <div style={{ fontSize: 14, fontWeight: 600, color: textColor, marginBottom: 4 }}>
+                {isBehind
+                  ? `Behind schedule — catch up ${item.sections_to_catch_up} section${item.sections_to_catch_up !== 1 ? "s" : ""}`
+                  : isOnTrack
+                    ? "On track — keep going!"
+                    : item.status === "completed"
+                      ? "Meeting target completed!"
+                      : "Ahead of schedule — great job!"}
+              </div>
+              <div style={{ fontSize: 13, color: textColor, opacity: 0.85 }}>
+                {item.meeting_title || `Target: ${item.target_section_label || `Section ${item.target_section}`}`}
+                {" — "}
+                {item.ebook_title}
+              </div>
+              <div style={{ fontSize: 12, color: textColor, opacity: 0.7, marginTop: 2 }}>
+                {isBehind
+                  ? `Currently at section ${item.current_section}, need section ${item.target_section}`
+                  : `Section ${item.current_section} of ${item.target_section}`}
+                {item.days_until_meeting > 0 &&
+                  ` · ${item.days_until_meeting} day${item.days_until_meeting !== 1 ? "s" : ""} until meeting`}
+                {item.days_until_meeting === 0 && " · Meeting today"}
+              </div>
+            </div>
+            <button
+              type="button"
+              onClick={() => handleDismiss(item.meeting_id, item.ebook_id)}
+              style={{
+                background: "none",
+                border: "none",
+                color: textColor,
+                fontSize: 20,
+                cursor: "pointer",
+                padding: "0 4px",
+                lineHeight: 1,
+                opacity: 0.6,
+                flexShrink: 0,
+              }}
+              title="Dismiss"
+            >
+              ×
+            </button>
+          </div>
+        );
+      })}
+    </div>
+  );
+}

frontend/src/components/notifications/ReadingPaceBanner.tsx

@@ -0,0 +1,71 @@
+import { useEffect, useState } from "react";
+import { groupsApi } from "../../api/groups";
+import type { PaceStatus } from "../../types/notifications";
+
+interface ReadingPaceBannerProps {
+  ebookId: number;
+  currentSection: number;
+}
+
+export function ReadingPaceBanner({ ebookId, currentSection }: ReadingPaceBannerProps) {
+  const [paceItems, setPaceItems] = useState<PaceStatus[]>([]);
+
+  useEffect(() => {
+    const load = async () => {
+      try {
+        const data = await groupsApi.getPaceStatus(ebookId);
+        setPaceItems(data);
+      } catch {
+        // Silently fail
+      }
+    };
+    void load();
+  }, [ebookId, currentSection]);
+
+  if (paceItems.length === 0) return null;
+
+  // Only show if user is one section away from target
+  const relevantItems = paceItems.filter(
+    (p) => Math.abs(p.target_section - p.current_section) <= 1 && p.status !== "completed",
+  );
+
+  if (relevantItems.length === 0) return null;
+
+  return (
+    <div
+      style={{
+        background: "linear-gradient(135deg, #667eea 0%, #764ba2 100%)",
+        color: "#fff",
+        padding: "10px 16px",
+        fontSize: 13,
+        fontWeight: 500,
+        textAlign: "center",
+        display: "flex",
+        alignItems: "center",
+        justifyContent: "center",
+        gap: 8,
+        flexWrap: "wrap",
+        position: "sticky",
+        top: 0,
+        zIndex: 10,
+      }}
+    >
+      {relevantItems.map((item) => {
+        const isAlmostThere = item.sections_to_catch_up === 1;
+        const isAtTarget = item.sections_to_catch_up === 0;
+
+        return (
+          <span key={item.meeting_id}>
+            {isAtTarget
+              ? `You've reached the target for ${item.meeting_title || `Section ${item.target_section}`}!`
+              : isAlmostThere
+                ? `Almost there! Just 1 section to go for ${item.meeting_title || `Section ${item.target_section}`}.`
+                : `You should be on ${item.target_section_label || `Section ${item.target_section}`} by the upcoming meeting.`}
+            {item.days_until_meeting > 0 &&
+              ` (${item.days_until_meeting} day${item.days_until_meeting !== 1 ? "s" : ""} left)`}
+          </span>
+        );
+      })}
+    </div>
+  );
+}

frontend/src/components/reader/EpubReadingView.tsx

@@ -22,6 +22,7 @@ import { SelectionPopover } from "./SelectionPopover";
 import { BookMarkersPanel } from "./BookMarkersPanel";
 import { BookmarkReaderRail } from "./BookmarkReaderRail";
 import { ResumeReadingButton } from "./ResumeReadingButton";
+import { ReadingPaceBanner } from "../notifications/ReadingPaceBanner";
 import type { MarkerEntry } from "@/types";
 
 const ReaderToolbar = lazy(() => import("./ReaderToolbar"));
@@ -130,6 +131,10 @@ export function EpubReadingView({ book, bookId, initialEpubLocation }: EpubReadi
 
   return (
     <ReaderSuspenseShell theme={settings.theme}>
+        <ReadingPaceBanner
+          ebookId={bookId}
+          currentSection={tocItems.length > 0 ? Math.max(1, Math.ceil((progress / 100) * tocItems.length)) : 0}
+        />
         <ReaderToolbar
           bookTitle={book.title}
           chapterTitle={chapterTitle || t("reader.reading")}

frontend/src/components/reader/PdfReadingView.tsx

@@ -24,6 +24,7 @@ import { BookmarkReaderRail } from "./BookmarkReaderRail";
 import { ResumeReadingButton } from "./ResumeReadingButton";
 import { PdfLimitationsNotice } from "./PdfLimitationsNotice";
 import { PdfViewer } from "./PdfViewer";
+import { ReadingPaceBanner } from "../notifications/ReadingPaceBanner";
 import type { MarkerEntry } from "@/types";
 
 const ReaderToolbar = lazy(() => import("./ReaderToolbar"));
@@ -170,6 +171,10 @@ export function PdfReadingView({ book, bookId, initialAnchor }: PdfReadingViewPr
 
   return (
     <ReaderSuspenseShell theme={settings.theme}>
+        <ReadingPaceBanner
+          ebookId={bookId}
+          currentSection={currentPage}
+        />
         <ReaderToolbar
           bookTitle={book.title}
           chapterTitle={chapterTitle || t("reader.reading")}

frontend/src/pages/Library.tsx

@@ -19,6 +19,7 @@ import { useVoiceSearch } from "../hooks/useVoiceSearch";
 import { useMediaQuery, BREAKPOINTS } from "../hooks/useMediaQuery";
 import { SearchSuggestions } from "../components/search/SearchSuggestions";
 import { BookContextMenu } from "../components/BookContextMenu";
+import { PaceNotification } from "../components/notifications/PaceNotification";
 
 interface FilterState {
   genre: string;
@@ -256,6 +257,9 @@ export function LibraryPage() {
         </div>
       </header>
 
+      {/* Pace Notifications */}
+      <PaceNotification />
+
       {/* Search Bar */}
       <div style={{ marginBottom: 16 }}>
         <div style={{ display: "flex", gap: 8, alignItems: "center" }}>

frontend/src/pages/Settings.tsx

@@ -2,7 +2,9 @@ import { useEffect, useState } from "react";
 import { useNavigate } from "react-router-dom";
 import { useTranslation } from "react-i18n-lite";
 import { booksApi } from "../api/books";
+import { groupsApi } from "../api/groups";
 import type { ReadingSettings } from "../types/book";
+import type { NotificationPreferences } from "../types/notifications";
 import type { SupportedLanguage } from "../locales";
 import { SimpleFormPageLayout } from "../components/layout/SimpleFormPageLayout";
 
@@ -17,6 +19,7 @@ export function SettingsPage() {
   const { t, language, setLanguage } = useTranslation();
   const navigate = useNavigate();
   const [settings, setSettings] = useState<ReadingSettings | null>(null);
+  const [notifPrefs, setNotifPrefs] = useState<NotificationPreferences | null>(null);
   const [loading, setLoading] = useState(true);
   const [saving, setSaving] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -24,7 +27,14 @@ export function SettingsPage() {
 
   useEffect(() => {
     const load = async () => {
-      try { const data = await booksApi.getSettings(); setSettings(data); }
+      try {
+        const [data, notifData] = await Promise.all([
+          booksApi.getSettings(),
+          groupsApi.getPreferences(),
+        ]);
+        setSettings(data);
+        setNotifPrefs(notifData);
+      }
       catch (err) { setError(err instanceof Error ? err.message : t("settings.loadFailed")); }
       finally { setLoading(false); }
     };
@@ -32,9 +42,15 @@ export function SettingsPage() {
   }, [t]);
 
   const handleSave = async () => {
-    if (!settings) return;
+    if (!settings || !notifPrefs) return;
     setSaving(true); setError(null); setSuccess(false);
-    try { await booksApi.updateSettings(settings); setSuccess(true); setTimeout(() => setSuccess(false), 2000); }
+    try {
+      await Promise.all([
+        booksApi.updateSettings(settings),
+        groupsApi.updatePreferences(notifPrefs),
+      ]);
+      setSuccess(true); setTimeout(() => setSuccess(false), 2000);
+    }
     catch (err) { setError(err instanceof Error ? err.message : t("settings.saveFailed")); }
     finally { setSaving(false); }
   };
@@ -85,6 +101,48 @@ export function SettingsPage() {
           </div>
         </>}
 
+        {notifPrefs && <>
+          <div style={{ borderTop: "1px solid #e5e7eb", paddingTop: 20 }}>
+            <h3 style={{ fontSize: 16, fontWeight: 600, color: "#1f2937", marginBottom: 16 }}>
+              Notification Settings
+            </h3>
+
+            <div style={{ display: "flex", flexDirection: "column", gap: 12 }}>
+              <label style={{ display: "flex", alignItems: "center", gap: 10, fontSize: 14, color: "#374151", cursor: "pointer" }}>
+                <input
+                  type="checkbox"
+                  checked={notifPrefs.pace_notifications_enabled}
+                  onChange={(e) => setNotifPrefs({ ...notifPrefs, pace_notifications_enabled: e.target.checked })}
+                  style={{ width: 18, height: 18, cursor: "pointer" }}
+                />
+                Enable pace notifications
+              </label>
+
+              <label style={{ display: "flex", alignItems: "center", gap: 10, fontSize: 14, color: "#374151", cursor: "pointer" }}>
+                <input
+                  type="checkbox"
+                  checked={notifPrefs.reminder_enabled}
+                  onChange={(e) => setNotifPrefs({ ...notifPrefs, reminder_enabled: e.target.checked })}
+                  style={{ width: 18, height: 18, cursor: "pointer" }}
+                />
+                Enable pre-meeting reminders (24h before)
+              </label>
+
+              <div style={{ display: "flex", flexDirection: "column", gap: 8 }}>
+                <label style={{ fontSize: 14, fontWeight: 600, color: "#555" }}>Notification frequency</label>
+                <select
+                  value={notifPrefs.frequency}
+                  onChange={(e) => setNotifPrefs({ ...notifPrefs, frequency: e.target.value as NotificationPreferences["frequency"] })}
+                  style={{ padding: "10px 12px", borderRadius: 6, border: "1px solid #ddd", fontSize: 16, background: "#fff", outline: "none" }}
+                >
+                  <option value="daily">Daily</option>
+                  <option value="weekly">Weekly</option>
+                </select>
+              </div>
+            </div>
+          </div>
+        </>}
+
         <button onClick={handleSave} disabled={saving} style={{ padding: "12px 24px", borderRadius: 8, border: "none", background: "#1a1a2e", color: "#fff", fontSize: 16, fontWeight: 600, cursor: "pointer", opacity: saving ? 0.6 : 1, marginTop: 8 }}>{saving ? t("common.saving") : t("settings.saveSettings")}</button>
       </div>
     </SimpleFormPageLayout>

frontend/src/types/notifications.ts

@@ -0,0 +1,65 @@
+export interface PaceStatus {
+  meeting_id: number;
+  meeting_title: string;
+  scheduled_at: string;
+  target_section: number;
+  target_section_label: string;
+  current_section: number;
+  ahead_behind_delta: number;
+  status: "ahead" | "behind" | "on_track" | "completed";
+  days_until_meeting: number;
+  sections_to_catch_up: number;
+  ebook_id: number;
+  ebook_title: string;
+}
+
+export interface NotificationPreferences {
+  pace_notifications_enabled: boolean;
+  reminder_enabled: boolean;
+  frequency: "daily" | "weekly";
+}
+
+export interface MeetingReminder {
+  meeting_id: number;
+  meeting_title: string;
+  scheduled_at: string;
+  target_section: number;
+  target_section_label: string;
+  group_name: string;
+  hours_until: number;
+  ebook_id: number;
+  ebook_title: string;
+}
+
+export interface ReadingGroup {
+  id: number;
+  name: string;
+  description: string;
+  book: number | null;
+  ebook: number | null;
+  created_by: number;
+  created_at: string;
+  member_count: number;
+  meeting_count: number;
+}
+
+export interface GroupMeeting {
+  id: number;
+  group: number;
+  group_name: string;
+  title: string;
+  scheduled_at: string;
+  target_section: number;
+  target_section_label: string;
+  created_at: string;
+}
+
+export interface GroupMembership {
+  id: number;
+  user: number;
+  user_email: string;
+  group: number;
+  group_name: string;
+  role: "admin" | "member";
+  joined_at: string;
+}

mobile/.env.example

@@ -0,0 +1,10 @@
+# Mobile (Expo) environment (example – never commit real secrets)
+# Base URL of the Django backend. Must be reachable from the device/emulator.
+#   - Android emulator: http://10.0.2.2:8000
+#   - iOS simulator:    http://localhost:8000
+#   - Physical device:  http://<your-lan-ip>:8000
+EXPO_PUBLIC_API_URL=http://10.0.2.2:8000
+
+# EAS Build: set per profile in mobile/eas.json or via:
+#   eas secret:create --name EXPO_PUBLIC_API_URL --value https://your-api.example.com
+# Run all eas commands from mobile/ (not repo root).

mobile/App.tsx

@@ -1,4 +1,8 @@
 import React from "react";
+// Peer dependencies for @epubjs-react-native/core and gesture-handler.
+import "react-native-webview";
+import "react-native-reanimated";
+import { GestureHandlerRootView } from "react-native-gesture-handler";
 import { NavigationContainer } from "@react-navigation/native";
 import { StatusBar } from "expo-status-bar";
 import { AuthProvider } from "./src/context/AuthContext";
@@ -6,11 +10,13 @@ import { RootNavigator } from "./src/navigation/RootNavigator";
 
 export default function App() {
   return (
+    <GestureHandlerRootView style={{ flex: 1 }}>
       <AuthProvider>
         <NavigationContainer>
           <StatusBar style="auto" />
           <RootNavigator />
         </NavigationContainer>
       </AuthProvider>
+    </GestureHandlerRootView>
   );
 }

mobile/app.json

@@ -21,7 +21,6 @@
       "package": "com.cloudreader.app"
     },
     "plugins": [
-      "expo-document-picker",
       "expo-file-system"
     ]
   }

mobile/eas.json

@@ -0,0 +1,42 @@
+{
+  "cli": {
+    "version": ">= 13.0.0",
+    "appVersionSource": "remote"
+  },
+  "build": {
+    "base": {
+      "node": "20.18.0",
+      "env": {
+        "EXPO_PUBLIC_API_URL": "https://api.example.com"
+      }
+    },
+    "development": {
+      "extends": "base",
+      "developmentClient": true,
+      "distribution": "internal",
+      "ios": {
+        "simulator": true
+      },
+      "android": {
+        "buildType": "apk"
+      },
+      "env": {
+        "EXPO_PUBLIC_API_URL": "http://10.0.2.2:8000"
+      }
+    },
+    "preview": {
+      "extends": "base",
+      "distribution": "internal",
+      "android": {
+        "buildType": "apk"
+      }
+    },
+    "production": {
+      "extends": "base",
+      "autoIncrement": true
+    }
+  },
+  "submit": {
+    "production": {}
+  }
+}

mobile/metro.config.js

@@ -0,0 +1,25 @@
+const { getDefaultConfig } = require("expo/metro-config");
+const path = require("path");
+
+const projectRoot = __dirname;
+const monorepoRoot = path.resolve(projectRoot, "..");
+
+/**
+ * Expo SDK 52+ configures Metro for Yarn/npm/pnpm workspaces automatically
+ * when using expo/metro-config. This file keeps an explicit monorepo root so
+ * @cloud-reader/shared (packages/shared) resolves reliably in dev and on EAS.
+ *
+ * If you previously added manual watchFolders/nodeModulesPaths and things
+ * work, prefer this minimal config. After changes: npx expo start --clear
+ *
+ * @see https://docs.expo.dev/guides/monorepos/
+ */
+const config = getDefaultConfig(projectRoot);
+
+config.watchFolders = [monorepoRoot];
+config.resolver.nodeModulesPaths = [
+  path.resolve(projectRoot, "node_modules"),
+  path.resolve(monorepoRoot, "node_modules"),
+];
+
+module.exports = config;

mobile/package.json

@@ -8,7 +8,11 @@
     "android": "expo start --android",
     "ios": "expo start --ios",
     "web": "expo start --web",
-    "lint": "eslint ."
+    "lint": "eslint .",
+    "eas:init": "eas init",
+    "eas:build:dev": "eas build --profile development --platform all",
+    "eas:build:preview": "eas build --profile preview --platform all",
+    "eas:build:prod": "eas build --profile production --platform all"
   },
   "dependencies": {
     "expo": "~52.0.0",
@@ -22,10 +26,12 @@
     "@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",
+    "@epubjs-react-native/core": "1.4.7",
+    "@epubjs-react-native/expo-file-system": "1.1.4",
     "expo-file-system": "~18.0.0",
     "react-native-gesture-handler": "~2.20.0",
     "react-native-reanimated": "~3.16.0",
+    "react-native-webview": "13.12.5",
     "@cloud-reader/shared": "*"
   },
   "devDependencies": {

mobile/src/api/annotations.ts

@@ -1,55 +1,31 @@
 import api from "./client";
-import type {
-  Bookmark,
-  Note,
-  CreateBookmarkPayload,
-  CreateNotePayload,
-  PaginatedResponse,
-} from "@cloud-reader/shared";
+import type { PaginatedResponse } from "@cloud-reader/shared";
+import type { Bookmark, CreateMarkerPayload } from "../types";
 
-export function fetchBookmarks(
-  bookId?: string,
+export async function fetchBookmarks(
+  ebookId?: string | number,
 ): Promise<PaginatedResponse<Bookmark>> {
-  const params = bookId ? { book: bookId } : {};
-  return api
-    .get<PaginatedResponse<Bookmark>>("/api/annotations/bookmarks/", { params })
-    .then((res) => res.data);
+  const params: Record<string, string> = {};
+  if (ebookId != null && ebookId !== "") {
+    params.ebook = String(ebookId);
+  }
+  const { data } = await api.get<PaginatedResponse<Bookmark>>(
+    "/api/annotations/bookmarks/",
+    { params },
+  );
+  return data;
 }
 
-export function createBookmark(
-  payload: CreateBookmarkPayload,
+export async function createMarker(
+  payload: CreateMarkerPayload,
 ): Promise<Bookmark> {
-  return api
-    .post<Bookmark>("/api/annotations/bookmarks/", payload)
-    .then((res) => res.data);
+  const { data } = await api.post<Bookmark>(
+    "/api/annotations/bookmarks/",
+    payload,
+  );
+  return 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/${id}/`).then(() => {});
+export async function deleteBookmark(id: string): Promise<void> {
+  await api.delete(`/api/annotations/bookmarks/${id}/`);
 }

mobile/src/api/books.ts

@@ -1,31 +1,12 @@
 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/${id}/`).then((res) => res.data);
-}
-
 export function searchBooks(
   query: string,
 ): Promise<PaginatedResponse<Book>> {
   return api
-    .get<PaginatedResponse<Book>>("/api/books/search/", {
+    .get<PaginatedResponse<Book>>("/api/books/", {
       params: { q: query },
     })
     .then((res) => res.data);
 }
-
-export function deleteBook(id: string): Promise<void> {
-  return api.delete(`/api/books/${id}/`).then(() => {});
-}

mobile/src/api/client.ts

@@ -1,5 +1,6 @@
 import axios, { type AxiosError, type InternalAxiosRequestConfig } from "axios";
 import AsyncStorage from "@react-native-async-storage/async-storage";
+import type { TokenResponse } from "@cloud-reader/shared";
 
 const STORAGE_KEYS = {
   ACCESS_TOKEN: "access_token",
@@ -39,6 +40,26 @@ async function clearTokens(): Promise<void> {
   ]);
 }
 
+async function saveTokens(tokens: TokenResponse): Promise<void> {
+  await setTokens(tokens.access, tokens.refresh);
+}
+
+async function loadTokens(): Promise<TokenResponse | null> {
+  const [access, refresh] = await Promise.all([
+    getAccessToken(),
+    getRefreshToken(),
+  ]);
+  if (!access || !refresh) {
+    return null;
+  }
+  return { access, refresh };
+}
+
+/** Absolute base URL used for direct (non-axios) requests like file downloads. */
+function getApiBaseUrl(): string {
+  return api.defaults.baseURL ?? "";
+}
+
 // ── Request interceptor ─────────────────────────────────────────────
 
 api.interceptors.request.use(async (config: InternalAxiosRequestConfig) => {
@@ -136,5 +157,14 @@ api.interceptors.response.use(
   },
 );
 
-export { getAccessToken, getRefreshToken, setTokens, clearTokens };
+const apiClient = api;
+
+export {
+  apiClient,
+  getAccessToken,
+  saveTokens,
+  loadTokens,
+  clearTokens,
+  getApiBaseUrl,
+};
 export default api;

mobile/src/api/ebooks.ts

@@ -1,54 +1,35 @@
-import { apiClient } from "./client";
+import { apiClient, getApiBaseUrl } from "./client";
 import type {
   EBookListItem,
   EBookDetail,
-  ReadingProgress,
-  ReadingSettings,
   TocResponse,
-  ContentResponse,
   PaginatedResponse,
 } from "@cloud-reader/shared";
 
 export const ebooksApi = {
-  /** List uploaded e-books */
+  /** List the authenticated user's uploaded e-books */
   list() {
-    return apiClient.get<PaginatedResponse<EBookListItem>>("/api/ebooks/");
+    return apiClient.get<PaginatedResponse<EBookListItem>>(
+      "/api/books/ebooks/",
+    );
   },
 
-  /** Get e-book detail */
+  /** Get e-book detail (metadata, format, progress) */
   get(id: number) {
-    return apiClient.get<EBookDetail>(`/api/ebooks/${id}/`);
+    return apiClient.get<EBookDetail>(`/api/books/ebooks/${id}/`);
   },
 
-  /** Get table of contents */
+  /** Get the table of contents (used as a fallback for chapter navigation) */
   getToc(id: number) {
-    return apiClient.get<TocResponse>(`/api/ebooks/${id}/toc/`);
+    return apiClient.get<TocResponse>(`/api/books/ebooks/${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/${id}/settings/`,
-      data,
-    );
+  /**
+   * Absolute URL to stream the raw ebook file. The endpoint requires JWT auth,
+   * so callers download it with an Authorization header (e.g. via
+   * expo-file-system) rather than handing the URL to a renderer directly.
+   */
+  getFileUrl(id: number): string {
+    return `${getApiBaseUrl()}/api/books/ebooks/${id}/file/`;
   },
 };

mobile/src/api/index.ts

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

mobile/src/api/reader.ts

@@ -0,0 +1,75 @@
+/**
+ * Reader API client — reading settings and per-book progress.
+ * Mirrors frontend/src/api/reader.ts. Uses the shared axios client so the
+ * JWT access token is attached automatically.
+ */
+
+import api from "./client";
+import type { ReadingProgress, ReadingSettings } from "../types/reader";
+
+export async function getReadingSettings(): Promise<ReadingSettings> {
+  const { data } = await api.get<ReadingSettings>("/api/reader/settings/");
+  return data;
+}
+
+export async function updateReadingSettings(
+  settings: Partial<ReadingSettings>,
+): Promise<ReadingSettings> {
+  const { data } = await api.patch<ReadingSettings>(
+    "/api/reader/settings/",
+    settings,
+  );
+  return data;
+}
+
+interface ProgressWire {
+  current_position: number;
+  last_page: number;
+  epub_location?: string;
+  updated_at?: string;
+}
+
+function toReadingProgress(bookId: number, data: ProgressWire): ReadingProgress {
+  return {
+    id: bookId,
+    book: bookId,
+    current_chapter: data.last_page || 1,
+    current_position: data.current_position ?? 0,
+    percentage: data.current_position ?? 0,
+    epub_location: data.epub_location ?? "",
+    updated_at: data.updated_at ?? "",
+  };
+}
+
+export async function getReadingProgress(
+  bookId: number,
+): Promise<ReadingProgress> {
+  const { data } = await api.get<ProgressWire>(
+    `/api/books/ebooks/${bookId}/progress/`,
+  );
+  return toReadingProgress(bookId, data);
+}
+
+export async function updateReadingProgress(
+  bookId: number,
+  progress: Partial<ReadingProgress>,
+): Promise<ReadingProgress> {
+  const body: Record<string, string | number> = {};
+  if (
+    progress.percentage !== undefined ||
+    progress.current_position !== undefined
+  ) {
+    body.current_position = progress.percentage ?? progress.current_position ?? 0;
+  }
+  if (progress.current_chapter !== undefined) {
+    body.last_page = progress.current_chapter;
+  }
+  if (progress.epub_location !== undefined) {
+    body.epub_location = progress.epub_location;
+  }
+  const { data } = await api.patch<ProgressWire>(
+    `/api/books/ebooks/${bookId}/progress/`,
+    body,
+  );
+  return toReadingProgress(bookId, data);
+}

mobile/src/components/reader/BookmarksModal.tsx

@@ -0,0 +1,147 @@
+import { type ReactNode } from "react";
+import {
+  Text,
+  FlatList,
+  TouchableOpacity,
+  StyleSheet,
+  View,
+} from "react-native";
+import { resolvePalette } from "../../utils/epubTheme";
+import type { ReadingSettings } from "../../types/reader";
+import type { Bookmark } from "../../types";
+import { ReaderBottomSheet } from "./ReaderBottomSheet";
+
+interface BookmarksModalProps {
+  visible: boolean;
+  bookmarks: Bookmark[];
+  settings: ReadingSettings;
+  onSelect: (bookmark: Bookmark) => void;
+  onDelete: (bookmark: Bookmark) => void;
+  onClose: () => void;
+}
+
+export function BookmarksModal({
+  visible,
+  bookmarks,
+  settings,
+  onSelect,
+  onDelete,
+  onClose,
+}: BookmarksModalProps): ReactNode {
+  const palette = resolvePalette(settings);
+
+  return (
+    <ReaderBottomSheet
+      visible={visible}
+      title="Bookmarks & highlights"
+      chromeColor={palette.chrome}
+      textColor={palette.text}
+      onClose={onClose}
+    >
+      <FlatList
+        data={bookmarks}
+        keyExtractor={(item) => item.id}
+        ListEmptyComponent={
+          <Text style={[styles.empty, { color: palette.text }]}>
+            No bookmarks yet. Tap the star to bookmark a page, or select text to
+            highlight it.
+          </Text>
+        }
+        renderItem={({ item }) => (
+          <View style={styles.row}>
+            <TouchableOpacity
+              style={styles.rowMain}
+              onPress={() => onSelect(item)}
+            >
+              {item.highlight_color ? (
+                <View
+                  style={[
+                    styles.dot,
+                    { backgroundColor: item.highlight_color },
+                  ]}
+                />
+              ) : (
+                <Text style={styles.star}>★</Text>
+              )}
+              <View style={styles.rowTextWrap}>
+                {item.chapter_title ? (
+                  <Text
+                    style={[styles.chapter, { color: palette.text }]}
+                    numberOfLines={1}
+                  >
+                    {item.chapter_title}
+                  </Text>
+                ) : null}
+                <Text
+                  style={[styles.excerpt, { color: palette.text }]}
+                  numberOfLines={2}
+                >
+                  {item.content || item.location_text || "Bookmarked page"}
+                </Text>
+              </View>
+            </TouchableOpacity>
+            <TouchableOpacity
+              onPress={() => onDelete(item)}
+              hitSlop={8}
+              style={styles.deleteButton}
+            >
+              <Text style={styles.deleteText}>Delete</Text>
+            </TouchableOpacity>
+          </View>
+        )}
+      />
+    </ReaderBottomSheet>
+  );
+}
+
+const styles = StyleSheet.create({
+  row: {
+    flexDirection: "row",
+    alignItems: "center",
+    paddingVertical: 12,
+    paddingHorizontal: 16,
+    borderTopWidth: StyleSheet.hairlineWidth,
+    borderTopColor: "rgba(127,127,127,0.2)",
+  },
+  rowMain: {
+    flex: 1,
+    flexDirection: "row",
+    alignItems: "center",
+  },
+  rowTextWrap: {
+    flex: 1,
+    marginLeft: 10,
+  },
+  star: {
+    fontSize: 16,
+    color: "#4f8ef7",
+  },
+  dot: {
+    width: 14,
+    height: 14,
+    borderRadius: 7,
+  },
+  chapter: {
+    fontSize: 12,
+    opacity: 0.7,
+    marginBottom: 2,
+  },
+  excerpt: {
+    fontSize: 14,
+  },
+  deleteButton: {
+    marginLeft: 12,
+    paddingHorizontal: 10,
+    paddingVertical: 6,
+  },
+  deleteText: {
+    color: "#ff453a",
+    fontSize: 13,
+    fontWeight: "600",
+  },
+  empty: {
+    padding: 24,
+    textAlign: "center",
+    opacity: 0.7,
+  },
+});

mobile/src/components/reader/EpubReaderView.tsx

@@ -0,0 +1,436 @@
+import { useCallback, useEffect, useRef, useState, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  ActivityIndicator,
+  StyleSheet,
+  type LayoutChangeEvent,
+} from "react-native";
+import { SafeAreaView } from "react-native-safe-area-context";
+import { Reader, ReaderProvider, useReader } from "@epubjs-react-native/core";
+import { useFileSystem } from "@epubjs-react-native/expo-file-system";
+import * as FileSystem from "expo-file-system";
+import type { EBookDetail } from "@cloud-reader/shared";
+import { getAccessToken } from "../../api/client";
+import { ebooksApi } from "../../api/ebooks";
+import { getReadingProgress, updateReadingProgress } from "../../api/reader";
+import {
+  fetchBookmarks,
+  createMarker,
+  deleteBookmark,
+} from "../../api/annotations";
+import { useReadingSettings } from "../../hooks/useReadingSettings";
+import {
+  buildEpubTheme,
+  FONT_STACKS,
+  resolvePalette,
+} from "../../utils/epubTheme";
+import type { Bookmark } from "../../types";
+import { ReaderToolbar } from "./ReaderToolbar";
+import { TocModal, type TocItem } from "./TocModal";
+import { ReadingSettingsModal } from "./ReadingSettingsModal";
+import { BookmarksModal } from "./BookmarksModal";
+
+const HIGHLIGHT_COLOR = "#ffd54a";
+const PROGRESS_SAVE_MS = 800;
+
+/** Loose view of the epubjs-react-native reader API we rely on. */
+interface ReaderApi {
+  goToLocation?: (target: string) => void;
+  changeTheme?: (theme: Record<string, Record<string, string>>) => void;
+  changeFontSize?: (size: string) => void;
+  changeFontFamily?: (font: string) => void;
+  addAnnotation?: (
+    type: string,
+    cfiRange: string,
+    data?: unknown,
+    styles?: Record<string, unknown>,
+  ) => void;
+  removeAnnotationByCfi?: (cfi: string) => void;
+  removeSelection?: () => void;
+  toc?: TocItem[];
+}
+
+interface EpubLocation {
+  start?: { cfi?: string };
+}
+
+interface EpubSection {
+  label?: string;
+  index?: number;
+}
+
+interface EpubReaderViewProps {
+  book: EBookDetail;
+  ebookId: number;
+  onClose: () => void;
+}
+
+export function EpubReaderView(props: EpubReaderViewProps): ReactNode {
+  return (
+    <ReaderProvider>
+      <EpubReaderInner {...props} />
+    </ReaderProvider>
+  );
+}
+
+function EpubReaderInner({
+  book,
+  ebookId,
+  onClose,
+}: EpubReaderViewProps): ReactNode {
+  const reader = useReader() as unknown as ReaderApi;
+  const { settings, updateSettings } = useReadingSettings();
+
+  const [src, setSrc] = useState<string | null>(null);
+  const [initialLocation, setInitialLocation] = useState<string | undefined>();
+  const [fileError, setFileError] = useState(false);
+  const [ready, setReady] = useState(false);
+  const [size, setSize] = useState<{ width: number; height: number } | null>(
+    null,
+  );
+
+  const [progressPct, setProgressPct] = useState(
+    Math.round(book.progress?.current_position ?? 0),
+  );
+  const [chapterTitle, setChapterTitle] = useState("");
+  const [currentCfi, setCurrentCfi] = useState("");
+  const [bookmarks, setBookmarks] = useState<Bookmark[]>([]);
+
+  const [tocOpen, setTocOpen] = useState(false);
+  const [settingsOpen, setSettingsOpen] = useState(false);
+  const [bookmarksOpen, setBookmarksOpen] = useState(false);
+
+  const currentCfiRef = useRef("");
+  const progressPctRef = useRef(progressPct);
+  const sectionRef = useRef<{ index: number; label: string }>({
+    index: 0,
+    label: "",
+  });
+  const bookmarksRef = useRef<Bookmark[]>([]);
+  const saveTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  useEffect(() => {
+    bookmarksRef.current = bookmarks;
+  }, [bookmarks]);
+
+  // Download the EPUB with auth, and resolve the saved resume location.
+  useEffect(() => {
+    let active = true;
+    (async () => {
+      try {
+        const progress = await getReadingProgress(ebookId).catch(() => null);
+        if (active && progress?.epub_location) {
+          setInitialLocation(progress.epub_location);
+          currentCfiRef.current = progress.epub_location;
+          setCurrentCfi(progress.epub_location);
+        }
+        const token = await getAccessToken();
+        const url = ebooksApi.getFileUrl(ebookId);
+        const dest = `${FileSystem.cacheDirectory}ebook-${ebookId}.epub`;
+        const result = await FileSystem.downloadAsync(url, dest, {
+          headers: token ? { Authorization: `Bearer ${token}` } : undefined,
+        });
+        if (!active) return;
+        if (result.status >= 400) {
+          setFileError(true);
+          return;
+        }
+        setSrc(result.uri);
+      } catch {
+        if (active) setFileError(true);
+      }
+    })();
+    return () => {
+      active = false;
+    };
+  }, [ebookId]);
+
+  // Load existing bookmarks/highlights for this book.
+  useEffect(() => {
+    let active = true;
+    fetchBookmarks(ebookId)
+      .then((res) => {
+        if (active) setBookmarks(res.results);
+      })
+      .catch(() => {
+        /* bookmarks are optional */
+      });
+    return () => {
+      active = false;
+    };
+  }, [ebookId]);
+
+  // Apply typography/theme to the rendition once it is ready and on changes.
+  useEffect(() => {
+    if (!ready) return;
+    try {
+      reader.changeTheme?.(buildEpubTheme(settings));
+      reader.changeFontSize?.(`${settings.font_size}px`);
+      reader.changeFontFamily?.(FONT_STACKS[settings.font_family]);
+    } catch {
+      /* ignore rendition styling errors */
+    }
+  }, [ready, settings, reader]);
+
+  const flushProgress = useCallback(() => {
+    const cfi = currentCfiRef.current;
+    if (!cfi) return;
+    updateReadingProgress(ebookId, {
+      percentage: progressPctRef.current,
+      epub_location: cfi,
+      current_chapter: sectionRef.current.index + 1,
+    }).catch(() => {
+      /* progress is best-effort */
+    });
+  }, [ebookId]);
+
+  // Flush the latest progress when leaving the reader.
+  useEffect(
+    () => () => {
+      if (saveTimerRef.current) clearTimeout(saveTimerRef.current);
+      flushProgress();
+    },
+    [flushProgress],
+  );
+
+  const handleReady = useCallback(() => {
+    setReady(true);
+    bookmarksRef.current.forEach((bookmark) => {
+      if (bookmark.highlight_color && bookmark.epub_cfi) {
+        try {
+          reader.addAnnotation?.("highlight", bookmark.epub_cfi, undefined, {
+            fill: bookmark.highlight_color,
+          });
+        } catch {
+          /* highlight rendering is best-effort */
+        }
+      }
+    });
+  }, [reader]);
+
+  const handleLocationChange = useCallback(
+    (
+      _total: number,
+      location: EpubLocation,
+      progress: number,
+      section: EpubSection | null,
+    ) => {
+      const cfi = location?.start?.cfi ?? "";
+      if (cfi) {
+        currentCfiRef.current = cfi;
+        setCurrentCfi(cfi);
+      }
+      const pct = Math.round(progress ?? 0);
+      progressPctRef.current = pct;
+      setProgressPct(pct);
+      const label = section?.label?.trim() ?? "";
+      sectionRef.current = {
+        index: section?.index ?? sectionRef.current.index,
+        label,
+      };
+      setChapterTitle(label);
+
+      if (saveTimerRef.current) clearTimeout(saveTimerRef.current);
+      saveTimerRef.current = setTimeout(flushProgress, PROGRESS_SAVE_MS);
+    },
+    [flushProgress],
+  );
+
+  const handleSelected = useCallback(
+    async (selectedText: string, cfiRange: string) => {
+      const excerpt = (selectedText ?? "").slice(0, 280);
+      try {
+        const created = await createMarker({
+          ebook: ebookId,
+          epub_cfi: cfiRange,
+          chapter_index: sectionRef.current.index,
+          chapter_title: sectionRef.current.label,
+          location_text: excerpt,
+          content: excerpt,
+          highlight_color: HIGHLIGHT_COLOR,
+        });
+        setBookmarks((prev) => [created, ...prev]);
+        try {
+          reader.addAnnotation?.("highlight", cfiRange, undefined, {
+            fill: HIGHLIGHT_COLOR,
+          });
+          reader.removeSelection?.();
+        } catch {
+          /* annotation rendering is best-effort */
+        }
+      } catch {
+        /* ignore highlight save failures */
+      }
+    },
+    [ebookId, reader],
+  );
+
+  const handleToggleBookmarkHere = useCallback(async () => {
+    const cfi = currentCfiRef.current;
+    if (!cfi) return;
+    const existing = bookmarksRef.current.find((b) => b.epub_cfi === cfi);
+    if (existing) {
+      setBookmarks((prev) => prev.filter((b) => b.id !== existing.id));
+      try {
+        reader.removeAnnotationByCfi?.(cfi);
+      } catch {
+        /* best-effort */
+      }
+      deleteBookmark(existing.id).catch(() => {});
+      return;
+    }
+    try {
+      const created = await createMarker({
+        ebook: ebookId,
+        epub_cfi: cfi,
+        chapter_index: sectionRef.current.index,
+        chapter_title: sectionRef.current.label,
+        location_text: sectionRef.current.label,
+      });
+      setBookmarks((prev) => [created, ...prev]);
+    } catch {
+      /* ignore bookmark save failures */
+    }
+  }, [ebookId, reader]);
+
+  const handleSelectBookmark = useCallback(
+    (bookmark: Bookmark) => {
+      setBookmarksOpen(false);
+      try {
+        reader.goToLocation?.(bookmark.epub_cfi);
+      } catch {
+        /* best-effort */
+      }
+    },
+    [reader],
+  );
+
+  const handleDeleteBookmark = useCallback(
+    (bookmark: Bookmark) => {
+      setBookmarks((prev) => prev.filter((b) => b.id !== bookmark.id));
+      try {
+        if (bookmark.highlight_color) {
+          reader.removeAnnotationByCfi?.(bookmark.epub_cfi);
+        }
+      } catch {
+        /* best-effort */
+      }
+      deleteBookmark(bookmark.id).catch(() => {});
+    },
+    [reader],
+  );
+
+  const handleTocSelect = useCallback(
+    (href: string) => {
+      setTocOpen(false);
+      try {
+        reader.goToLocation?.(href);
+      } catch {
+        /* best-effort */
+      }
+    },
+    [reader],
+  );
+
+  const onReaderLayout = useCallback((event: LayoutChangeEvent) => {
+    const { width, height } = event.nativeEvent.layout;
+    setSize((prev) =>
+      prev && prev.width === width && prev.height === height
+        ? prev
+        : { width, height },
+    );
+  }, []);
+
+  const palette = resolvePalette(settings);
+  const isBookmarked = bookmarks.some((b) => b.epub_cfi === currentCfi);
+
+  return (
+    <SafeAreaView
+      style={[styles.container, { backgroundColor: palette.background }]}
+      edges={["top", "bottom"]}
+    >
+      <ReaderToolbar
+        title={book.title}
+        chapterTitle={chapterTitle}
+        progressPct={progressPct}
+        settings={settings}
+        isBookmarked={isBookmarked}
+        onBack={onClose}
+        onToggleToc={() => setTocOpen(true)}
+        onToggleSettings={() => setSettingsOpen(true)}
+        onToggleBookmarks={() => setBookmarksOpen(true)}
+        onToggleBookmarkHere={handleToggleBookmarkHere}
+      />
+
+      <View style={styles.readerArea} onLayout={onReaderLayout}>
+        {fileError ? (
+          <View style={styles.centered}>
+            <Text style={[styles.message, { color: palette.text }]}>
+              Could not download this book. Check your connection and try again.
+            </Text>
+          </View>
+        ) : src && size ? (
+          <Reader
+            src={src}
+            fileSystem={useFileSystem}
+            width={size.width}
+            height={size.height}
+            initialLocation={initialLocation}
+            enableSelection
+            flow="paginated"
+            defaultTheme={buildEpubTheme(settings)}
+            onReady={handleReady}
+            onLocationChange={handleLocationChange}
+            onSelected={handleSelected}
+          />
+        ) : (
+          <View style={styles.centered}>
+            <ActivityIndicator size="large" color="#4f8ef7" />
+          </View>
+        )}
+      </View>
+
+      <TocModal
+        visible={tocOpen}
+        toc={reader.toc ?? []}
+        settings={settings}
+        onSelect={handleTocSelect}
+        onClose={() => setTocOpen(false)}
+      />
+      <ReadingSettingsModal
+        visible={settingsOpen}
+        settings={settings}
+        onChange={updateSettings}
+        onClose={() => setSettingsOpen(false)}
+      />
+      <BookmarksModal
+        visible={bookmarksOpen}
+        bookmarks={bookmarks}
+        settings={settings}
+        onSelect={handleSelectBookmark}
+        onDelete={handleDeleteBookmark}
+        onClose={() => setBookmarksOpen(false)}
+      />
+    </SafeAreaView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+  readerArea: {
+    flex: 1,
+  },
+  centered: {
+    flex: 1,
+    justifyContent: "center",
+    alignItems: "center",
+    padding: 24,
+  },
+  message: {
+    fontSize: 15,
+    textAlign: "center",
+  },
+});

mobile/src/components/reader/ReaderBottomSheet.tsx

@@ -0,0 +1,92 @@
+import { type ReactNode } from "react";
+import {
+  Modal,
+  View,
+  Text,
+  TouchableOpacity,
+  StyleSheet,
+  type StyleProp,
+  type ViewStyle,
+} from "react-native";
+
+interface ReaderBottomSheetProps {
+  visible: boolean;
+  title: string;
+  chromeColor: string;
+  textColor: string;
+  onClose: () => void;
+  children: ReactNode;
+  /** When true, caps sheet height (TOC/bookmarks). Settings uses a full-width panel. */
+  tall?: boolean;
+  sheetStyle?: StyleProp<ViewStyle>;
+}
+
+export function ReaderBottomSheet({
+  visible,
+  title,
+  chromeColor,
+  textColor,
+  onClose,
+  children,
+  tall = true,
+  sheetStyle,
+}: ReaderBottomSheetProps): ReactNode {
+  return (
+    <Modal
+      visible={visible}
+      animationType="slide"
+      transparent
+      onRequestClose={onClose}
+    >
+      <View style={styles.backdrop}>
+        <View
+          style={[
+            styles.sheet,
+            tall && styles.sheetTall,
+            { backgroundColor: chromeColor },
+            sheetStyle,
+          ]}
+        >
+          <View style={styles.header}>
+            <Text style={[styles.headerTitle, { color: textColor }]}>
+              {title}
+            </Text>
+            <TouchableOpacity onPress={onClose} hitSlop={12}>
+              <Text style={[styles.close, { color: textColor }]}>✕</Text>
+            </TouchableOpacity>
+          </View>
+          {children}
+        </View>
+      </View>
+    </Modal>
+  );
+}
+
+const styles = StyleSheet.create({
+  backdrop: {
+    flex: 1,
+    backgroundColor: "rgba(0,0,0,0.4)",
+    justifyContent: "flex-end",
+  },
+  sheet: {
+    borderTopLeftRadius: 16,
+    borderTopRightRadius: 16,
+    paddingBottom: 24,
+  },
+  sheetTall: {
+    maxHeight: "75%",
+  },
+  header: {
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "space-between",
+    padding: 16,
+  },
+  headerTitle: {
+    fontSize: 16,
+    fontWeight: "700",
+  },
+  close: {
+    fontSize: 18,
+  },
+});

mobile/src/components/reader/ReaderToolbar.tsx

@@ -0,0 +1,152 @@
+import { type ReactNode } from "react";
+import { View, Text, TouchableOpacity, StyleSheet } from "react-native";
+import { resolvePalette } from "../../utils/epubTheme";
+import type { ReadingSettings } from "../../types/reader";
+
+interface ReaderToolbarProps {
+  title: string;
+  chapterTitle: string;
+  progressPct: number;
+  settings: ReadingSettings;
+  isBookmarked: boolean;
+  onBack: () => void;
+  onToggleToc: () => void;
+  onToggleSettings: () => void;
+  onToggleBookmarks: () => void;
+  onToggleBookmarkHere: () => void;
+}
+
+export function ReaderToolbar({
+  title,
+  chapterTitle,
+  progressPct,
+  settings,
+  isBookmarked,
+  onBack,
+  onToggleToc,
+  onToggleSettings,
+  onToggleBookmarks,
+  onToggleBookmarkHere,
+}: ReaderToolbarProps): ReactNode {
+  const palette = resolvePalette(settings);
+
+  return (
+    <View style={[styles.bar, { backgroundColor: palette.chrome }]}>
+      <View style={styles.row}>
+        <TouchableOpacity
+          onPress={onBack}
+          hitSlop={12}
+          style={styles.iconButton}
+        >
+          <Text style={[styles.icon, { color: palette.text }]}>‹</Text>
+        </TouchableOpacity>
+
+        <View style={styles.titles}>
+          <Text
+            style={[styles.title, { color: palette.text }]}
+            numberOfLines={1}
+          >
+            {title}
+          </Text>
+          {chapterTitle ? (
+            <Text
+              style={[styles.chapter, { color: palette.text }]}
+              numberOfLines={1}
+            >
+              {chapterTitle}
+            </Text>
+          ) : null}
+        </View>
+
+        <TouchableOpacity
+          onPress={onToggleBookmarkHere}
+          hitSlop={12}
+          style={styles.iconButton}
+        >
+          <Text style={[styles.icon, { color: palette.text }]}>
+            {isBookmarked ? "★" : "☆"}
+          </Text>
+        </TouchableOpacity>
+        <TouchableOpacity
+          onPress={onToggleBookmarks}
+          hitSlop={12}
+          style={styles.iconButton}
+        >
+          <Text style={[styles.iconSmall, { color: palette.text }]}>≡</Text>
+        </TouchableOpacity>
+        <TouchableOpacity
+          onPress={onToggleToc}
+          hitSlop={12}
+          style={styles.iconButton}
+        >
+          <Text style={[styles.iconSmall, { color: palette.text }]}>⊟</Text>
+        </TouchableOpacity>
+        <TouchableOpacity
+          onPress={onToggleSettings}
+          hitSlop={12}
+          style={styles.iconButton}
+        >
+          <Text style={[styles.iconSmall, { color: palette.text }]}>Aa</Text>
+        </TouchableOpacity>
+      </View>
+
+      <View style={styles.progressTrack}>
+        <View
+          style={[
+            styles.progressFill,
+            { width: `${Math.min(100, Math.max(0, progressPct))}%` },
+          ]}
+        />
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  bar: {
+    paddingTop: 8,
+    paddingHorizontal: 8,
+    paddingBottom: 6,
+  },
+  row: {
+    flexDirection: "row",
+    alignItems: "center",
+  },
+  titles: {
+    flex: 1,
+    marginHorizontal: 8,
+  },
+  title: {
+    fontSize: 14,
+    fontWeight: "600",
+  },
+  chapter: {
+    fontSize: 11,
+    opacity: 0.7,
+  },
+  iconButton: {
+    paddingHorizontal: 8,
+    paddingVertical: 4,
+    minWidth: 28,
+    alignItems: "center",
+  },
+  icon: {
+    fontSize: 28,
+    lineHeight: 30,
+  },
+  iconSmall: {
+    fontSize: 17,
+    fontWeight: "600",
+  },
+  progressTrack: {
+    height: 3,
+    borderRadius: 2,
+    backgroundColor: "rgba(127,127,127,0.25)",
+    marginTop: 6,
+    overflow: "hidden",
+  },
+  progressFill: {
+    height: "100%",
+    backgroundColor: "#4f8ef7",
+  },
+});

mobile/src/components/reader/ReadingSettingsModal.tsx

@@ -0,0 +1,249 @@
+import { type ReactNode } from "react";
+import {
+  View,
+  Text,
+  TouchableOpacity,
+  StyleSheet,
+} from "react-native";
+import { resolvePalette, THEME_PALETTES } from "../../utils/epubTheme";
+import type {
+  FontFamily,
+  ReadingSettings,
+  ThemePreset,
+} from "../../types/reader";
+import { ReaderBottomSheet } from "./ReaderBottomSheet";
+
+const THEMES: ThemePreset[] = ["light", "sepia", "paper", "dark"];
+const FONTS: { value: FontFamily; label: string }[] = [
+  { value: "serif", label: "Serif" },
+  { value: "sans-serif", label: "Sans" },
+  { value: "monospace", label: "Mono" },
+];
+const FONT_SIZE_MIN = 12;
+const FONT_SIZE_MAX = 32;
+const LINE_HEIGHT_MIN = 1.2;
+const LINE_HEIGHT_MAX = 2.2;
+
+interface ReadingSettingsModalProps {
+  visible: boolean;
+  settings: ReadingSettings;
+  onChange: (patch: Partial<ReadingSettings>) => void;
+  onClose: () => void;
+}
+
+export function ReadingSettingsModal({
+  visible,
+  settings,
+  onChange,
+  onClose,
+}: ReadingSettingsModalProps): ReactNode {
+  const palette = resolvePalette(settings);
+
+  const adjustFontSize = (delta: number) => {
+    const next = Math.min(
+      FONT_SIZE_MAX,
+      Math.max(FONT_SIZE_MIN, settings.font_size + delta),
+    );
+    onChange({ font_size: next });
+  };
+
+  const adjustLineHeight = (delta: number) => {
+    const next = Math.min(
+      LINE_HEIGHT_MAX,
+      Math.max(
+        LINE_HEIGHT_MIN,
+        Math.round((settings.line_height + delta) * 10) / 10,
+      ),
+    );
+    onChange({ line_height: next });
+  };
+
+  return (
+    <ReaderBottomSheet
+      visible={visible}
+      title="Display"
+      chromeColor={palette.chrome}
+      textColor={palette.text}
+      onClose={onClose}
+      tall={false}
+      sheetStyle={styles.sheetBody}
+    >
+      <Text style={[styles.sectionLabel, { color: palette.text }]}>Theme</Text>
+      <View style={styles.rowWrap}>
+        {THEMES.map((theme) => {
+          const p = THEME_PALETTES[theme];
+          const active = settings.theme === theme;
+          return (
+            <TouchableOpacity
+              key={theme}
+              onPress={() =>
+                onChange({
+                  theme,
+                  background_color: p.background,
+                  text_color: p.text,
+                })
+              }
+              style={[
+                styles.themeSwatch,
+                { backgroundColor: p.background },
+                active && styles.themeSwatchActive,
+              ]}
+            >
+              <Text style={[styles.themeSwatchText, { color: p.text }]}>
+                Aa
+              </Text>
+            </TouchableOpacity>
+          );
+        })}
+      </View>
+
+      <Text style={[styles.sectionLabel, { color: palette.text }]}>Font</Text>
+      <View style={styles.rowWrap}>
+        {FONTS.map((font) => {
+          const active = settings.font_family === font.value;
+          return (
+            <TouchableOpacity
+              key={font.value}
+              onPress={() => onChange({ font_family: font.value })}
+              style={[styles.pill, active && styles.pillActive]}
+            >
+              <Text
+                style={[
+                  styles.pillText,
+                  { color: active ? "#fff" : palette.text },
+                ]}
+              >
+                {font.label}
+              </Text>
+            </TouchableOpacity>
+          );
+        })}
+      </View>
+
+      <Stepper
+        label="Font size"
+        value={`${settings.font_size}px`}
+        color={palette.text}
+        onDecrease={() => adjustFontSize(-1)}
+        onIncrease={() => adjustFontSize(1)}
+      />
+      <Stepper
+        label="Line spacing"
+        value={settings.line_height.toFixed(1)}
+        color={palette.text}
+        onDecrease={() => adjustLineHeight(-0.1)}
+        onIncrease={() => adjustLineHeight(0.1)}
+      />
+    </ReaderBottomSheet>
+  );
+}
+
+function Stepper({
+  label,
+  value,
+  color,
+  onDecrease,
+  onIncrease,
+}: {
+  label: string;
+  value: string;
+  color: string;
+  onDecrease: () => void;
+  onIncrease: () => void;
+}): ReactNode {
+  return (
+    <View style={styles.stepperRow}>
+      <Text style={[styles.sectionLabel, { color, marginBottom: 0 }]}>
+        {label}
+      </Text>
+      <View style={styles.stepperControls}>
+        <TouchableOpacity style={styles.stepperButton} onPress={onDecrease}>
+          <Text style={styles.stepperButtonText}>−</Text>
+        </TouchableOpacity>
+        <Text style={[styles.stepperValue, { color }]}>{value}</Text>
+        <TouchableOpacity style={styles.stepperButton} onPress={onIncrease}>
+          <Text style={styles.stepperButtonText}>+</Text>
+        </TouchableOpacity>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  sheetBody: {
+    paddingHorizontal: 20,
+    paddingBottom: 32,
+  },
+  sectionLabel: {
+    fontSize: 13,
+    fontWeight: "600",
+    marginBottom: 8,
+    marginTop: 8,
+    opacity: 0.8,
+  },
+  rowWrap: {
+    flexDirection: "row",
+    flexWrap: "wrap",
+    gap: 10,
+  },
+  themeSwatch: {
+    width: 56,
+    height: 48,
+    borderRadius: 10,
+    justifyContent: "center",
+    alignItems: "center",
+    borderWidth: 2,
+    borderColor: "transparent",
+  },
+  themeSwatchActive: {
+    borderColor: "#4f8ef7",
+  },
+  themeSwatchText: {
+    fontSize: 16,
+    fontWeight: "600",
+  },
+  pill: {
+    paddingHorizontal: 16,
+    paddingVertical: 8,
+    borderRadius: 20,
+    borderWidth: 1,
+    borderColor: "rgba(127,127,127,0.4)",
+  },
+  pillActive: {
+    backgroundColor: "#4f8ef7",
+    borderColor: "#4f8ef7",
+  },
+  pillText: {
+    fontSize: 14,
+    fontWeight: "600",
+  },
+  stepperRow: {
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "space-between",
+    marginTop: 16,
+  },
+  stepperControls: {
+    flexDirection: "row",
+    alignItems: "center",
+  },
+  stepperButton: {
+    width: 36,
+    height: 36,
+    borderRadius: 18,
+    backgroundColor: "rgba(127,127,127,0.2)",
+    justifyContent: "center",
+    alignItems: "center",
+  },
+  stepperButtonText: {
+    fontSize: 20,
+    fontWeight: "700",
+    color: "#4f8ef7",
+  },
+  stepperValue: {
+    minWidth: 56,
+    textAlign: "center",
+    fontSize: 15,
+    fontWeight: "600",
+  },
+});

mobile/src/components/reader/TocModal.tsx

@@ -0,0 +1,111 @@
+import { type ReactNode } from "react";
+import {
+  Text,
+  FlatList,
+  TouchableOpacity,
+  StyleSheet,
+} from "react-native";
+import { resolvePalette } from "../../utils/epubTheme";
+import type { ReadingSettings } from "../../types/reader";
+import { ReaderBottomSheet } from "./ReaderBottomSheet";
+
+export interface TocItem {
+  id?: string;
+  label: string;
+  href: string;
+  subitems?: TocItem[];
+}
+
+interface FlatTocItem {
+  key: string;
+  label: string;
+  href: string;
+  depth: number;
+}
+
+function flatten(items: TocItem[], depth = 0, acc: FlatTocItem[] = []) {
+  items.forEach((item, index) => {
+    acc.push({
+      key: `${item.id ?? item.href}-${depth}-${index}`,
+      label: (item.label ?? "").trim() || "Untitled section",
+      href: item.href,
+      depth,
+    });
+    if (item.subitems?.length) {
+      flatten(item.subitems, depth + 1, acc);
+    }
+  });
+  return acc;
+}
+
+interface TocModalProps {
+  visible: boolean;
+  toc: TocItem[];
+  settings: ReadingSettings;
+  onSelect: (href: string) => void;
+  onClose: () => void;
+}
+
+export function TocModal({
+  visible,
+  toc,
+  settings,
+  onSelect,
+  onClose,
+}: TocModalProps): ReactNode {
+  const palette = resolvePalette(settings);
+  const data = flatten(toc);
+
+  return (
+    <ReaderBottomSheet
+      visible={visible}
+      title="Contents"
+      chromeColor={palette.chrome}
+      textColor={palette.text}
+      onClose={onClose}
+    >
+      <FlatList
+        data={data}
+        keyExtractor={(item) => item.key}
+        ListEmptyComponent={
+          <Text style={[styles.empty, { color: palette.text }]}>
+            No table of contents available.
+          </Text>
+        }
+        renderItem={({ item }) => (
+          <TouchableOpacity
+            style={styles.row}
+            onPress={() => onSelect(item.href)}
+          >
+            <Text
+              style={[
+                styles.rowText,
+                { color: palette.text, marginLeft: item.depth * 16 },
+              ]}
+              numberOfLines={2}
+            >
+              {item.label}
+            </Text>
+          </TouchableOpacity>
+        )}
+      />
+    </ReaderBottomSheet>
+  );
+}
+
+const styles = StyleSheet.create({
+  row: {
+    paddingVertical: 12,
+    paddingHorizontal: 16,
+    borderTopWidth: StyleSheet.hairlineWidth,
+    borderTopColor: "rgba(127,127,127,0.2)",
+  },
+  rowText: {
+    fontSize: 14,
+  },
+  empty: {
+    padding: 24,
+    textAlign: "center",
+    opacity: 0.7,
+  },
+});

mobile/src/hooks/index.ts

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

mobile/src/hooks/useAsyncData.ts

@@ -1,33 +0,0 @@
-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/hooks/useReadingSettings.ts

@@ -0,0 +1,82 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import {
+  getReadingSettings,
+  updateReadingSettings,
+} from "../api/reader";
+import type { ReadingSettings } from "../types/reader";
+
+const DEFAULT_READING_SETTINGS: ReadingSettings = {
+  font_family: "serif",
+  font_size: 18,
+  line_height: 1.5,
+  margin_width: 16,
+  background_color: "#fbfbf8",
+  text_color: "#2b2b2b",
+  brightness: 1,
+  orientation_lock: "auto",
+  theme: "paper",
+  created_at: "",
+  updated_at: "",
+};
+
+const SAVE_DEBOUNCE_MS = 600;
+
+interface UseReadingSettingsReturn {
+  settings: ReadingSettings;
+  loaded: boolean;
+  updateSettings: (patch: Partial<ReadingSettings>) => void;
+}
+
+/**
+ * Loads the user's reader settings and persists changes with a debounce.
+ * Mirrors frontend/src/hooks/useReadingSettings.ts behavior.
+ */
+export function useReadingSettings(): UseReadingSettingsReturn {
+  const [settings, setSettings] = useState<ReadingSettings>(
+    DEFAULT_READING_SETTINGS,
+  );
+  const [loaded, setLoaded] = useState(false);
+  const pendingRef = useRef<Partial<ReadingSettings>>({});
+  const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  useEffect(() => {
+    let active = true;
+    getReadingSettings()
+      .then((data) => {
+        if (active) {
+          setSettings(data);
+        }
+      })
+      .catch(() => {
+        /* keep defaults if the request fails */
+      })
+      .finally(() => {
+        if (active) {
+          setLoaded(true);
+        }
+      });
+    return () => {
+      active = false;
+      if (timerRef.current) {
+        clearTimeout(timerRef.current);
+      }
+    };
+  }, []);
+
+  const updateSettings = useCallback((patch: Partial<ReadingSettings>) => {
+    setSettings((prev) => ({ ...prev, ...patch }));
+    pendingRef.current = { ...pendingRef.current, ...patch };
+    if (timerRef.current) {
+      clearTimeout(timerRef.current);
+    }
+    timerRef.current = setTimeout(() => {
+      const body = pendingRef.current;
+      pendingRef.current = {};
+      updateReadingSettings(body).catch(() => {
+        /* ignore transient save failures */
+      });
+    }, SAVE_DEBOUNCE_MS);
+  }, []);
+
+  return { settings, loaded, updateSettings };
+}

mobile/src/navigation/AppNavigator.tsx

@@ -1,45 +0,0 @@
-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/AppStack.tsx

@@ -0,0 +1,36 @@
+import React from "react";
+import { createNativeStackNavigator } from "@react-navigation/native-stack";
+import { MainNavigator } from "./MainNavigator";
+import BookDetailScreen from "../screens/BookDetailScreen";
+import ReaderScreen from "../screens/ReaderScreen";
+import type { AppStackParamList } from "../types";
+
+const Stack = createNativeStackNavigator<AppStackParamList>();
+
+export function AppStack() {
+  return (
+    <Stack.Navigator
+      screenOptions={{
+        headerStyle: { backgroundColor: "#fff" },
+        headerTitleStyle: { fontWeight: "600", color: "#1a1a2e" },
+        headerTintColor: "#4a6cf7",
+      }}
+    >
+      <Stack.Screen
+        name="Tabs"
+        component={MainNavigator}
+        options={{ headerShown: false }}
+      />
+      <Stack.Screen
+        name="BookDetail"
+        component={BookDetailScreen}
+        options={{ title: "" }}
+      />
+      <Stack.Screen
+        name="Reader"
+        component={ReaderScreen}
+        options={{ headerShown: false }}
+      />
+    </Stack.Navigator>
+  );
+}

mobile/src/navigation/AuthNavigator.tsx

@@ -3,7 +3,7 @@ import { createNativeStackNavigator } from "@react-navigation/native-stack";
 import LoginScreen from "../screens/LoginScreen";
 import RegisterScreen from "../screens/RegisterScreen";
 
-export type AuthStackParamList = {
+type AuthStackParamList = {
   Login: undefined;
   Register: undefined;
 };

mobile/src/navigation/MainTabs.tsx

@@ -1,55 +0,0 @@
-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

@@ -2,7 +2,7 @@ import React from "react";
 import { ActivityIndicator, View } from "react-native";
 import { useAuth } from "../context/AuthContext";
 import { AuthNavigator } from "./AuthNavigator";
-import { MainNavigator } from "./MainNavigator";
+import { AppStack } from "./AppStack";
 
 export function RootNavigator() {
   const { isLoading, isAuthenticated } = useAuth();
@@ -19,5 +19,5 @@ export function RootNavigator() {
     return <AuthNavigator />;
   }
 
-  return <MainNavigator />;
+  return <AppStack />;
 }

mobile/src/screens/AuthFormError.tsx

@@ -0,0 +1,11 @@
+import { type ReactNode } from "react";
+import { View, Text } from "react-native";
+import { authStyles } from "./authStyles";
+
+export function AuthFormError({ message }: { message: string }): ReactNode {
+  return (
+    <View style={authStyles.errorBox}>
+      <Text style={authStyles.errorText}>{message}</Text>
+    </View>
+  );
+}

mobile/src/screens/BookDetailScreen.tsx

@@ -0,0 +1,226 @@
+import { useState, useEffect, useCallback, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  Image,
+  ScrollView,
+  TouchableOpacity,
+  StyleSheet,
+  ActivityIndicator,
+} from "react-native";
+import type { RouteProp } from "@react-navigation/native";
+import { ebooksApi } from "../api/ebooks";
+import { formatFileSize } from "@cloud-reader/shared";
+import type { EBookDetail } from "@cloud-reader/shared";
+import type { AppStackParamList } from "../types";
+
+type DetailRoute = RouteProp<AppStackParamList, "BookDetail">;
+
+export default function BookDetailScreen({
+  route,
+  navigation,
+}: {
+  route: DetailRoute;
+  navigation: any;
+}): ReactNode {
+  const { ebookId } = route.params;
+  const [book, setBook] = useState<EBookDetail | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(false);
+
+  const load = useCallback(async () => {
+    try {
+      const { data } = await ebooksApi.get(ebookId);
+      setBook(data);
+    } catch {
+      setError(true);
+    } finally {
+      setLoading(false);
+    }
+  }, [ebookId]);
+
+  useEffect(() => {
+    load();
+  }, [load]);
+
+  if (loading) {
+    return (
+      <View style={styles.centered}>
+        <ActivityIndicator size="large" color="#4f8ef7" />
+      </View>
+    );
+  }
+
+  if (error || !book) {
+    return (
+      <View style={styles.centered}>
+        <Text style={styles.errorText}>Could not load this book.</Text>
+      </View>
+    );
+  }
+
+  const progressPct =
+    typeof book.progress?.current_position === "number"
+      ? Math.round(book.progress.current_position)
+      : 0;
+  const hasProgress = progressPct > 0;
+
+  return (
+    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
+      <View style={styles.header}>
+        {book.cover_image ? (
+          <Image source={{ uri: book.cover_image }} style={styles.cover} />
+        ) : (
+          <View style={styles.cover}>
+            <Text style={styles.coverText}>
+              {book.title.charAt(0).toUpperCase()}
+            </Text>
+          </View>
+        )}
+        <Text style={styles.title}>{book.title}</Text>
+        <Text style={styles.author}>{book.author || "Unknown author"}</Text>
+      </View>
+
+      <View style={styles.metaRow}>
+        <MetaPill label="Format" value={book.format?.toUpperCase() || "—"} />
+        <MetaPill
+          label="Pages"
+          value={book.page_count ? String(book.page_count) : "—"}
+        />
+        <MetaPill label="Size" value={formatFileSize(book.file_size || 0)} />
+      </View>
+
+      {hasProgress && (
+        <View style={styles.progressWrap}>
+          <View style={styles.progressTrack}>
+            <View style={[styles.progressFill, { width: `${progressPct}%` }]} />
+          </View>
+          <Text style={styles.progressLabel}>{progressPct}% read</Text>
+        </View>
+      )}
+
+      <TouchableOpacity
+        style={styles.readButton}
+        onPress={() => navigation.navigate("Reader", { ebookId: book.id })}
+      >
+        <Text style={styles.readButtonText}>
+          {hasProgress ? "Resume reading" : "Start reading"}
+        </Text>
+      </TouchableOpacity>
+    </ScrollView>
+  );
+}
+
+function MetaPill({ label, value }: { label: string; value: string }): ReactNode {
+  return (
+    <View style={styles.metaPill}>
+      <Text style={styles.metaValue}>{value}</Text>
+      <Text style={styles.metaLabel}>{label}</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+  },
+  content: {
+    padding: 24,
+  },
+  centered: {
+    flex: 1,
+    justifyContent: "center",
+    alignItems: "center",
+    backgroundColor: "#0f0f23",
+    padding: 24,
+  },
+  header: {
+    alignItems: "center",
+    marginBottom: 24,
+  },
+  cover: {
+    width: 140,
+    height: 200,
+    borderRadius: 12,
+    backgroundColor: "#2a2a4e",
+    justifyContent: "center",
+    alignItems: "center",
+    marginBottom: 16,
+  },
+  coverText: {
+    fontSize: 56,
+    fontWeight: "bold",
+    color: "#4f8ef7",
+  },
+  title: {
+    fontSize: 22,
+    fontWeight: "700",
+    color: "#fff",
+    textAlign: "center",
+    marginBottom: 6,
+  },
+  author: {
+    fontSize: 15,
+    color: "#888",
+    textAlign: "center",
+  },
+  metaRow: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    marginBottom: 24,
+  },
+  metaPill: {
+    flex: 1,
+    backgroundColor: "#1a1a2e",
+    borderRadius: 10,
+    paddingVertical: 12,
+    marginHorizontal: 4,
+    alignItems: "center",
+    borderWidth: 1,
+    borderColor: "#333",
+  },
+  metaValue: {
+    fontSize: 15,
+    fontWeight: "600",
+    color: "#fff",
+  },
+  metaLabel: {
+    fontSize: 12,
+    color: "#666",
+    marginTop: 2,
+  },
+  progressWrap: {
+    marginBottom: 24,
+  },
+  progressTrack: {
+    height: 6,
+    borderRadius: 3,
+    backgroundColor: "#1a1a2e",
+    overflow: "hidden",
+  },
+  progressFill: {
+    height: "100%",
+    backgroundColor: "#4f8ef7",
+  },
+  progressLabel: {
+    fontSize: 12,
+    color: "#888",
+    marginTop: 6,
+  },
+  readButton: {
+    backgroundColor: "#4f8ef7",
+    borderRadius: 10,
+    paddingVertical: 16,
+    alignItems: "center",
+  },
+  readButtonText: {
+    color: "#fff",
+    fontSize: 16,
+    fontWeight: "600",
+  },
+  errorText: {
+    color: "#888",
+    fontSize: 15,
+  },
+});

mobile/src/screens/LibraryScreen.tsx

@@ -2,34 +2,31 @@ import { useState, useEffect, useCallback, type ReactNode } from "react";
 import {
   View,
   Text,
+  Image,
   FlatList,
   TouchableOpacity,
   StyleSheet,
   ActivityIndicator,
   RefreshControl,
 } from "react-native";
-import { fetchBooks } from "../api/books";
-import type { Book, PaginatedResponse } from "@cloud-reader/shared";
+import { ebooksApi } from "../api/ebooks";
+import type { EBookListItem } from "@cloud-reader/shared";
 
-export default function LibraryScreen({ navigation }: { navigation: any }): ReactNode {
-  const [books, setBooks] = useState<Book[]>([]);
+export default function LibraryScreen({
+  navigation,
+}: {
+  navigation: any;
+}): ReactNode {
+  const [books, setBooks] = useState<EBookListItem[]>([]);
   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) => {
+  const loadBooks = useCallback(async () => {
     try {
-      const data: PaginatedResponse<Book> = await fetchBooks(pageNum);
-      if (isRefresh) {
+      const { data } = await ebooksApi.list();
       setBooks(data.results);
-      } else {
-        setBooks((prev) => [...prev, ...data.results]);
-      }
-      setHasMore(data.next !== null);
-      setPage(pageNum);
     } catch {
-      // Silent error for now
+      // Silent error for now; pull-to-refresh lets the user retry.
     } finally {
       setLoading(false);
       setRefreshing(false);
@@ -37,43 +34,48 @@ export default function LibraryScreen({ navigation }: { navigation: any }): Reac
   }, []);
 
   useEffect(() => {
-    loadBooks(1, true);
+    loadBooks();
   }, [loadBooks]);
 
   const onRefresh = () => {
     setRefreshing(true);
-    loadBooks(1, true);
+    loadBooks();
   };
 
-  const loadMore = () => {
-    if (hasMore && !loading) {
-      loadBooks(page + 1);
-    }
-  };
-
-  const renderBook = ({ item }: { item: Book }) => (
+  const renderBook = ({ item }: { item: EBookListItem }) => {
+    const progress =
+      typeof item.progress === "number"
+        ? Math.round(item.progress)
+        : null;
+    return (
       <TouchableOpacity
         style={styles.bookCard}
-      onPress={() =>
-        navigation.navigate("BookDetail", { bookId: item.id })
-      }
+        onPress={() => navigation.navigate("BookDetail", { ebookId: item.id })}
       >
+        {item.cover_image ? (
+          <Image source={{ uri: item.cover_image }} style={styles.bookCover} />
+        ) : (
           <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}>
+          <Text style={styles.bookTitle} numberOfLines={2}>
             {item.title}
           </Text>
           <Text style={styles.bookAuthor} numberOfLines={1}>
-          {item.author}
+            {item.author || "Unknown author"}
+          </Text>
+          <Text style={styles.bookMeta}>
+            {item.format?.toUpperCase()}
+            {progress !== null ? ` · ${progress}% read` : ""}
           </Text>
-        <Text style={styles.bookPages}>{item.total_pages} pages</Text>
         </View>
       </TouchableOpacity>
     );
+  };
 
   if (loading && books.length === 0) {
     return (
@@ -88,9 +90,7 @@ export default function LibraryScreen({ navigation }: { navigation: any }): Reac
       <FlatList
         data={books}
         renderItem={renderBook}
-        keyExtractor={(item) => item.id}
-        onEndReached={loadMore}
-        onEndReachedThreshold={0.5}
+        keyExtractor={(item) => String(item.id)}
         contentContainerStyle={styles.list}
         refreshControl={
           <RefreshControl
@@ -103,7 +103,7 @@ export default function LibraryScreen({ navigation }: { navigation: any }): Reac
           <View style={styles.centered}>
             <Text style={styles.emptyText}>Your library is empty</Text>
             <Text style={styles.emptySubtext}>
-              Add books to get started
+              Upload books from the web app to get started
             </Text>
           </View>
         }
@@ -125,6 +125,7 @@ const styles = StyleSheet.create({
   },
   list: {
     padding: 16,
+    flexGrow: 1,
   },
   bookCard: {
     flexDirection: "row",
@@ -164,7 +165,7 @@ const styles = StyleSheet.create({
     color: "#888",
     marginBottom: 4,
   },
-  bookPages: {
+  bookMeta: {
     fontSize: 12,
     color: "#666",
   },
@@ -177,5 +178,6 @@ const styles = StyleSheet.create({
   emptySubtext: {
     fontSize: 14,
     color: "#666",
+    textAlign: "center",
   },
 });

mobile/src/screens/LoginScreen.tsx

@@ -4,29 +4,31 @@ import {
   Text,
   TextInput,
   TouchableOpacity,
-  StyleSheet,
   Alert,
   ActivityIndicator,
   KeyboardAvoidingView,
   Platform,
 } from "react-native";
 import { useAuth } from "../context/AuthContext";
-import { isValidEmail } from "@cloud-reader/shared";
+import { authStyles } from "./authStyles";
+import { AuthFormError } from "./AuthFormError";
+import { requireValidEmail } from "./authValidation";
 
-export default function LoginScreen({ navigation }: { navigation: any }): ReactNode {
-  const { state, login, clearError } = useAuth();
+export default function LoginScreen({
+  navigation,
+}: {
+  navigation: any;
+}): ReactNode {
+  const { login } = useAuth();
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [submitting, setSubmitting] = useState(false);
 
   const handleLogin = async () => {
-    clearError();
+    setError(null);
 
-    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.");
+    if (!requireValidEmail(email)) {
       return;
     }
     if (!password) {
@@ -34,30 +36,29 @@ export default function LoginScreen({ navigation }: { navigation: any }): ReactN
       return;
     }
 
+    setSubmitting(true);
     try {
       await login(email.trim(), password);
     } catch {
-      // Error handled in context
+      setError("Invalid email or password.");
+    } finally {
+      setSubmitting(false);
     }
   };
 
   return (
     <KeyboardAvoidingView
-      style={styles.container}
+      style={authStyles.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>
+      <View style={authStyles.inner}>
+        <Text style={authStyles.title}>Cloud Reader</Text>
+        <Text style={authStyles.subtitle}>Sign in to your account</Text>
 
-        {state.error && (
-          <View style={styles.errorBox}>
-            <Text style={styles.errorText}>{state.error}</Text>
-          </View>
-        )}
+        {error ? <AuthFormError message={error} /> : null}
 
         <TextInput
-          style={styles.input}
+          style={authStyles.input}
           placeholder="Email"
           placeholderTextColor="#666"
           value={email}
@@ -68,7 +69,7 @@ export default function LoginScreen({ navigation }: { navigation: any }): ReactN
         />
 
         <TextInput
-          style={styles.input}
+          style={authStyles.input}
           placeholder="Password"
           placeholderTextColor="#666"
           value={password}
@@ -77,97 +78,24 @@ export default function LoginScreen({ navigation }: { navigation: any }): ReactN
         />
 
         <TouchableOpacity
-          style={[styles.button, state.isLoading && styles.buttonDisabled]}
+          style={[authStyles.button, submitting && authStyles.buttonDisabled]}
           onPress={handleLogin}
-          disabled={state.isLoading}
+          disabled={submitting}
         >
-          {state.isLoading ? (
+          {submitting ? (
             <ActivityIndicator color="#fff" />
           ) : (
-            <Text style={styles.buttonText}>Sign In</Text>
+            <Text style={authStyles.buttonText}>Sign In</Text>
           )}
         </TouchableOpacity>
 
         <TouchableOpacity onPress={() => navigation.navigate("Register")}>
-          <Text style={styles.linkText}>
+          <Text style={authStyles.linkText}>
             Don't have an account?{" "}
-            <Text style={styles.linkBold}>Sign Up</Text>
+            <Text style={authStyles.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/ReaderScreen.tsx

@@ -0,0 +1,133 @@
+import { useEffect, useState, type ReactNode } from "react";
+import {
+  View,
+  Text,
+  TouchableOpacity,
+  ActivityIndicator,
+  StyleSheet,
+} from "react-native";
+import { SafeAreaView } from "react-native-safe-area-context";
+import type { RouteProp } from "@react-navigation/native";
+import type { EBookDetail } from "@cloud-reader/shared";
+import { ebooksApi } from "../api/ebooks";
+import { EpubReaderView } from "../components/reader/EpubReaderView";
+import type { AppStackParamList } from "../types";
+
+type ReaderRoute = RouteProp<AppStackParamList, "Reader">;
+
+export default function ReaderScreen({
+  route,
+  navigation,
+}: {
+  route: ReaderRoute;
+  navigation: any;
+}): ReactNode {
+  const { ebookId } = route.params;
+  const [book, setBook] = useState<EBookDetail | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(false);
+
+  useEffect(() => {
+    let active = true;
+    ebooksApi
+      .get(ebookId)
+      .then(({ data }) => {
+        if (active) setBook(data);
+      })
+      .catch(() => {
+        if (active) setError(true);
+      })
+      .finally(() => {
+        if (active) setLoading(false);
+      });
+    return () => {
+      active = false;
+    };
+  }, [ebookId]);
+
+  if (loading) {
+    return (
+      <View style={styles.centered}>
+        <ActivityIndicator size="large" color="#4f8ef7" />
+      </View>
+    );
+  }
+
+  if (error || !book) {
+    return (
+      <SafeAreaView style={styles.centered} edges={["top", "bottom"]}>
+        <Text style={styles.message}>Could not open this book.</Text>
+        <TouchableOpacity
+          style={styles.backButton}
+          onPress={() => navigation.goBack()}
+        >
+          <Text style={styles.backText}>Go back</Text>
+        </TouchableOpacity>
+      </SafeAreaView>
+    );
+  }
+
+  const format = (book.format ?? "").toLowerCase();
+
+  if (format !== "epub") {
+    return (
+      <SafeAreaView style={styles.centered} edges={["top", "bottom"]}>
+        <Text style={styles.placeholderTitle}>PDF reading is coming soon</Text>
+        <Text style={styles.message}>
+          “{book.title}” is a {format.toUpperCase() || "non-EPUB"} file. PDF
+          reading isn&apos;t available on mobile yet — open it in the web reader
+          for now.
+        </Text>
+        <TouchableOpacity
+          style={styles.backButton}
+          onPress={() => navigation.goBack()}
+        >
+          <Text style={styles.backText}>Go back</Text>
+        </TouchableOpacity>
+      </SafeAreaView>
+    );
+  }
+
+  return (
+    <EpubReaderView
+      book={book}
+      ebookId={ebookId}
+      onClose={() => navigation.goBack()}
+    />
+  );
+}
+
+const styles = StyleSheet.create({
+  centered: {
+    flex: 1,
+    justifyContent: "center",
+    alignItems: "center",
+    backgroundColor: "#0f0f23",
+    padding: 24,
+  },
+  placeholderTitle: {
+    fontSize: 20,
+    fontWeight: "700",
+    color: "#fff",
+    marginBottom: 12,
+    textAlign: "center",
+  },
+  message: {
+    fontSize: 15,
+    color: "#aaa",
+    textAlign: "center",
+    lineHeight: 22,
+  },
+  backButton: {
+    marginTop: 24,
+    backgroundColor: "#4f8ef7",
+    borderRadius: 10,
+    paddingHorizontal: 24,
+    paddingVertical: 12,
+  },
+  backText: {
+    color: "#fff",
+    fontSize: 15,
+    fontWeight: "600",
+  },
+});

mobile/src/screens/RegisterScreen.tsx

@@ -1,10 +1,8 @@
 import { useState, type ReactNode } from "react";
 import {
-  View,
   Text,
   TextInput,
   TouchableOpacity,
-  StyleSheet,
   Alert,
   ActivityIndicator,
   KeyboardAvoidingView,
@@ -12,40 +10,39 @@ import {
   ScrollView,
 } from "react-native";
 import { useAuth } from "../context/AuthContext";
-import {
-  isValidEmail,
-  validatePasswordStrength,
-} from "@cloud-reader/shared";
+import { isStrongPassword } from "@cloud-reader/shared";
+import { authStyles } from "./authStyles";
+import { AuthFormError } from "./AuthFormError";
+import { requireValidEmail } from "./authValidation";
 
 export default function RegisterScreen({
   navigation,
 }: {
   navigation: any;
 }): ReactNode {
-  const { state, register, clearError } = useAuth();
+  const { register } = useAuth();
   const [username, setUsername] = useState("");
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
   const [confirmPassword, setConfirmPassword] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [submitting, setSubmitting] = useState(false);
 
   const handleRegister = async () => {
-    clearError();
+    setError(null);
 
     if (!username.trim()) {
       Alert.alert("Validation Error", "Please enter a username.");
       return;
     }
-    if (!email.trim()) {
-      Alert.alert("Validation Error", "Please enter your email.");
+    if (!requireValidEmail(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);
+    if (!isStrongPassword(password)) {
+      Alert.alert(
+        "Validation Error",
+        "Password must be at least 8 characters and include uppercase, lowercase, and a number.",
+      );
       return;
     }
     if (password !== confirmPassword) {
@@ -53,30 +50,29 @@ export default function RegisterScreen({
       return;
     }
 
+    setSubmitting(true);
     try {
-      await register(email.trim(), password, username.trim());
+      await register(email.trim(), username.trim(), password);
     } catch {
-      // Error handled in context
+      setError("Could not create the account. Try a different email.");
+    } finally {
+      setSubmitting(false);
     }
   };
 
   return (
     <KeyboardAvoidingView
-      style={styles.container}
+      style={authStyles.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>
+      <ScrollView contentContainerStyle={authStyles.innerScroll}>
+        <Text style={authStyles.titleCompact}>Create Account</Text>
+        <Text style={authStyles.subtitle}>Join Cloud Reader</Text>
 
-        {state.error && (
-          <View style={styles.errorBox}>
-            <Text style={styles.errorText}>{state.error}</Text>
-          </View>
-        )}
+        {error ? <AuthFormError message={error} /> : null}
 
         <TextInput
-          style={styles.input}
+          style={authStyles.input}
           placeholder="Username"
           placeholderTextColor="#666"
           value={username}
@@ -86,7 +82,7 @@ export default function RegisterScreen({
         />
 
         <TextInput
-          style={styles.input}
+          style={authStyles.input}
           placeholder="Email"
           placeholderTextColor="#666"
           value={email}
@@ -97,7 +93,7 @@ export default function RegisterScreen({
         />
 
         <TextInput
-          style={styles.input}
+          style={authStyles.input}
           placeholder="Password"
           placeholderTextColor="#666"
           value={password}
@@ -106,7 +102,7 @@ export default function RegisterScreen({
         />
 
         <TextInput
-          style={styles.input}
+          style={authStyles.input}
           placeholder="Confirm Password"
           placeholderTextColor="#666"
           value={confirmPassword}
@@ -115,98 +111,24 @@ export default function RegisterScreen({
         />
 
         <TouchableOpacity
-          style={[styles.button, state.isLoading && styles.buttonDisabled]}
+          style={[authStyles.button, submitting && authStyles.buttonDisabled]}
           onPress={handleRegister}
-          disabled={state.isLoading}
+          disabled={submitting}
         >
-          {state.isLoading ? (
+          {submitting ? (
             <ActivityIndicator color="#fff" />
           ) : (
-            <Text style={styles.buttonText}>Create Account</Text>
+            <Text style={authStyles.buttonText}>Create Account</Text>
           )}
         </TouchableOpacity>
 
         <TouchableOpacity onPress={() => navigation.goBack()}>
-          <Text style={styles.linkText}>
+          <Text style={authStyles.linkText}>
             Already have an account?{" "}
-            <Text style={styles.linkBold}>Sign In</Text>
+            <Text style={authStyles.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/SettingsScreen.tsx

@@ -9,7 +9,7 @@ import {
 import { useAuth } from "../context/AuthContext";
 
 export default function SettingsScreen(): ReactNode {
-  const { state, logout } = useAuth();
+  const { user, logout } = useAuth();
 
   const handleLogout = () => {
     Alert.alert("Logout", "Are you sure you want to sign out?", [
@@ -24,11 +24,11 @@ export default function SettingsScreen(): ReactNode {
         <Text style={styles.sectionTitle}>Account</Text>
         <View style={styles.infoRow}>
           <Text style={styles.label}>Username</Text>
-          <Text style={styles.value}>{state.user?.username ?? "—"}</Text>
+          <Text style={styles.value}>{user?.username ?? "—"}</Text>
         </View>
         <View style={styles.infoRow}>
           <Text style={styles.label}>Email</Text>
-          <Text style={styles.value}>{state.user?.email ?? "—"}</Text>
+          <Text style={styles.value}>{user?.email ?? "—"}</Text>
         </View>
       </View>
 

mobile/src/screens/authStyles.ts

@@ -0,0 +1,88 @@
+import { StyleSheet } from "react-native";
+
+/** Shared layout/styles for Login and Register screens. */
+export const authStyles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: "#0f0f23",
+  },
+  inner: {
+    flex: 1,
+    justifyContent: "center",
+    paddingHorizontal: 24,
+  },
+  innerScroll: {
+    flexGrow: 1,
+    justifyContent: "center",
+    paddingHorizontal: 24,
+    paddingVertical: 48,
+  },
+  title: {
+    fontSize: 32,
+    fontWeight: "bold",
+    color: "#fff",
+    textAlign: "center",
+    marginBottom: 8,
+  },
+  titleCompact: {
+    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/authValidation.ts

@@ -0,0 +1,15 @@
+import { Alert } from "react-native";
+import { isValidEmail } from "@cloud-reader/shared";
+
+/** Returns true when email is non-empty and well-formed. */
+export function requireValidEmail(email: string): boolean {
+  if (!email.trim()) {
+    Alert.alert("Validation Error", "Please enter your email.");
+    return false;
+  }
+  if (!isValidEmail(email.trim())) {
+    Alert.alert("Validation Error", "Please enter a valid email address.");
+    return false;
+  }
+  return true;
+}

mobile/src/types/index.ts

@@ -1,8 +1,37 @@
 // Mobile-specific type aliases and extensions not covered by shared types
 
-export type RootStackParamList = {
-  Auth: undefined;
-  Main: undefined;
-  BookReader: { bookId: number };
-  BookDetail: { bookId: number };
+import type { NavigatorScreenParams } from "@react-navigation/native";
+import type { MainTabParamList } from "../navigation/MainNavigator";
+
+/** Stack hosted above the bottom tabs once the user is authenticated. */
+export type AppStackParamList = {
+  Tabs: NavigatorScreenParams<MainTabParamList> | undefined;
+  BookDetail: { ebookId: number };
+  Reader: { ebookId: number };
 };
+
+/** EPUB bookmark/highlight, mirrors frontend/src/types Bookmark. */
+export interface Bookmark {
+  id: string;
+  ebook: number;
+  ebook_title: string;
+  epub_cfi: string;
+  chapter_index: number;
+  chapter_title: string;
+  page: number;
+  location_text: string;
+  content: string;
+  highlight_color?: string;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface CreateMarkerPayload {
+  ebook: number;
+  epub_cfi: string;
+  chapter_index: number;
+  chapter_title?: string;
+  location_text?: string;
+  content?: string;
+  highlight_color?: string;
+}

mobile/src/types/reader.ts

@@ -0,0 +1,32 @@
+/**
+ * Reader module types for the mobile app. Mirrors
+ * frontend/src/types/reader.ts so settings and progress behave the same
+ * way across web and mobile.
+ */
+
+export interface ReadingSettings {
+  font_family: "sans-serif" | "serif" | "monospace";
+  font_size: number;
+  line_height: number;
+  margin_width: number;
+  background_color: string;
+  text_color: string;
+  brightness: number;
+  orientation_lock: "auto" | "portrait" | "landscape";
+  theme: "sepia" | "dark" | "light" | "paper";
+  created_at: string;
+  updated_at: string;
+}
+
+export type ThemePreset = ReadingSettings["theme"];
+export type FontFamily = ReadingSettings["font_family"];
+
+export interface ReadingProgress {
+  id: number;
+  book: number;
+  current_chapter: number;
+  current_position: number;
+  percentage: number;
+  epub_location: string;
+  updated_at: string;
+}

mobile/src/utils/epubTheme.ts

@@ -0,0 +1,66 @@
+import type { ReadingSettings, ThemePreset } from "../types/reader";
+
+/** CSS font stacks per family, mirrors frontend/src/utils/epubRendition.ts. */
+export const FONT_STACKS: Record<ReadingSettings["font_family"], string> = {
+  serif: 'Georgia, "Times New Roman", serif',
+  "sans-serif":
+    'system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif',
+  monospace: 'ui-monospace, "Cascadia Code", monospace',
+};
+
+/** Background/text/chrome colors for each reader theme preset. */
+export const THEME_PALETTES: Record<
+  ThemePreset,
+  { background: string; text: string; chrome: string }
+> = {
+  light: { background: "#ffffff", text: "#1a1a1a", chrome: "#f2f2f2" },
+  dark: { background: "#121212", text: "#e0e0e0", chrome: "#1c1c1e" },
+  sepia: { background: "#f4ecd8", text: "#5b4636", chrome: "#e8ddc4" },
+  paper: { background: "#fbfbf8", text: "#2b2b2b", chrome: "#efefe9" },
+};
+
+export function resolvePalette(settings: ReadingSettings) {
+  const preset = THEME_PALETTES[settings.theme] ?? THEME_PALETTES.light;
+  return {
+    background: settings.background_color || preset.background,
+    text: settings.text_color || preset.text,
+    chrome: preset.chrome,
+  };
+}
+
+/**
+ * Build an epub.js theme object (selector -> CSS rules) from reader settings.
+ * Used with the epubjs-react-native `changeTheme` method.
+ */
+export function buildEpubTheme(
+  settings: ReadingSettings,
+): Record<string, Record<string, string>> {
+  const { background, text } = resolvePalette(settings);
+  const fontStack = FONT_STACKS[settings.font_family] ?? FONT_STACKS.serif;
+  const lineHeight = `${settings.line_height} !important`;
+  const fontFamily = `${fontStack} !important`;
+  const color = `${text} !important`;
+
+  return {
+    body: {
+      background: `${background} !important`,
+      color,
+      "font-family": fontFamily,
+      "line-height": lineHeight,
+    },
+    p: {
+      color,
+      "font-family": fontFamily,
+      "line-height": lineHeight,
+    },
+    li: { color, "font-family": fontFamily, "line-height": lineHeight },
+    span: { color },
+    a: { color },
+    h1: { color },
+    h2: { color },
+    h3: { color },
+    h4: { color },
+    h5: { color },
+    h6: { color },
+  };
+}

mobile/tsconfig.json

@@ -12,7 +12,8 @@
     "forceConsistentCasingInFileNames": true,
     "baseUrl": ".",
     "paths": {
-      "@/*": ["src/*"]
+      "@/*": ["src/*"],
+      "@cloud-reader/shared": ["../packages/shared/src/index.ts"]
     }
   },
   "include": ["**/*.ts", "**/*.tsx"],