diff --git a/lib/app.dart b/lib/app.dart
index ef50671..135d78f 100644
--- a/lib/app.dart
+++ b/lib/app.dart
@@ -15,6 +15,7 @@ import 'providers/update_provider.dart';
 import 'providers/tasks_provider.dart';
 import 'screens/auth/login_screen.dart';
 import 'screens/briefing/briefing_screen.dart';
+import 'screens/library/project_tasks_screen.dart';
 import 'screens/chat/chat_screen.dart';
 import 'screens/chat/conversations_tab_screen.dart';
 import 'screens/library/library_screen.dart';
@@ -107,6 +108,12 @@ final routerProvider = Provider<GoRouter>((ref) {
           taskId: int.parse(state.pathParameters['id']!),
         ),
       ),
+      GoRoute(
+        path: Routes.projectTasks,
+        builder: (_, state) => ProjectTasksScreen(
+          projectId: int.parse(state.pathParameters['id']!),
+        ),
+      ),
       GoRoute(
         path: Routes.chat,
         builder: (_, state) => ChatScreen(
diff --git a/lib/core/constants.dart b/lib/core/constants.dart
index 5400dac..9d84bf1 100644
--- a/lib/core/constants.dart
+++ b/lib/core/constants.dart
@@ -16,4 +16,5 @@ abstract class Routes {
   static const settings = '/settings';
   static const briefing = '/briefing';
   static const library = '/library';
+  static const projectTasks = '/projects/:id/tasks';
 }
diff --git a/lib/data/api/tasks_api.dart b/lib/data/api/tasks_api.dart
index bb098b8..a0837c0 100644
--- a/lib/data/api/tasks_api.dart
+++ b/lib/data/api/tasks_api.dart
@@ -52,6 +52,24 @@ class TasksApi {
     }
   }
 
+  Future<List<Task>> getByProject(int projectId) async {
+    try {
+      final response = await _dio.get(
+        '/api/notes',
+        queryParameters: {
+          'project_id': projectId,
+          'is_task': 'true',
+          'limit': 500,
+        },
+      );
+      final data = response.data as Map<String, dynamic>;
+      final list = data['notes'] as List<dynamic>;
+      return list.map((e) => Task.fromJson(e as Map<String, dynamic>)).toList();
+    } on DioException catch (e) {
+      throw dioToApp(e);
+    }
+  }
+
   Future<List<Task>> getSubTasks(int parentId) async {
     try {
       final response = await _dio.get(
diff --git a/lib/data/repositories/tasks_repository.dart b/lib/data/repositories/tasks_repository.dart
index 6b509e4..c8f3abe 100644
--- a/lib/data/repositories/tasks_repository.dart
+++ b/lib/data/repositories/tasks_repository.dart
@@ -27,6 +27,7 @@ class TasksRepository {
         parentId: parentId,
       );
 
+  Future<List<Task>> getByProject(int projectId) => _api.getByProject(projectId);
   Future<List<Task>> getSubTasks(int parentId) => _api.getSubTasks(parentId);
 
   Future<Task> update(int id, Map<String, dynamic> fields) =>
diff --git a/lib/providers/tasks_provider.dart b/lib/providers/tasks_provider.dart
index b9555d4..9ad6b42 100644
--- a/lib/providers/tasks_provider.dart
+++ b/lib/providers/tasks_provider.dart
@@ -6,6 +6,11 @@ import 'api_client_provider.dart';
 final tasksProvider =
     AsyncNotifierProvider<TasksNotifier, List<Task>>(TasksNotifier.new);
 
+final projectTasksProvider =
+    FutureProvider.family<List<Task>, int>((ref, projectId) {
+  return ref.watch(tasksRepositoryProvider).getByProject(projectId);
+});
+
 class TasksNotifier extends AsyncNotifier<List<Task>> {
   @override
   Future<List<Task>> build() async {
diff --git a/lib/screens/library/project_tasks_screen.dart b/lib/screens/library/project_tasks_screen.dart
new file mode 100644
index 0000000..b21bbf5
--- /dev/null
+++ b/lib/screens/library/project_tasks_screen.dart
@@ -0,0 +1,381 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../core/constants.dart';
+import '../../data/models/milestone.dart';
+import '../../data/models/project.dart';
+import '../../data/models/task.dart';
+import '../../providers/api_client_provider.dart';
+import '../../providers/milestones_provider.dart';
+import '../../providers/projects_provider.dart';
+import '../../providers/tasks_provider.dart';
+
+class ProjectTasksScreen extends ConsumerStatefulWidget {
+  final int projectId;
+  const ProjectTasksScreen({super.key, required this.projectId});
+
+  @override
+  ConsumerState<ProjectTasksScreen> createState() => _ProjectTasksScreenState();
+}
+
+class _ProjectTasksScreenState extends ConsumerState<ProjectTasksScreen> {
+  // Local optimistic status overrides — avoids a reload flash on every cycle tap.
+  final Map<int, TaskStatus> _pendingStatus = {};
+
+  TaskStatus _effectiveStatus(Task task) =>
+      _pendingStatus[task.id] ?? task.status;
+
+  TaskStatus _nextStatus(TaskStatus s) => switch (s) {
+        TaskStatus.todo => TaskStatus.inProgress,
+        TaskStatus.inProgress => TaskStatus.done,
+        TaskStatus.done => TaskStatus.todo,
+      };
+
+  Future<void> _cycleStatus(Task task) async {
+    final current = _effectiveStatus(task);
+    final next = _nextStatus(current);
+    setState(() => _pendingStatus[task.id] = next);
+    try {
+      await ref
+          .read(tasksRepositoryProvider)
+          .update(task.id, {'status': next.value});
+      // Sync the global tasks list so the library view stays consistent.
+      ref.invalidate(tasksProvider);
+    } catch (_) {
+      // Revert optimistic change on error.
+      setState(() => _pendingStatus.remove(task.id));
+    }
+  }
+
+  Color _parseColor(String? hex) {
+    if (hex == null || hex.isEmpty) return const Color(0xFF6366F1);
+    try {
+      return Color(int.parse(hex.replaceFirst('#', '0xFF')));
+    } catch (_) {
+      return const Color(0xFF6366F1);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final tasksAsync = ref.watch(projectTasksProvider(widget.projectId));
+    final milestonesAsync = ref.watch(projectMilestonesProvider(widget.projectId));
+    final project = ref.watch(projectsProvider).value
+        ?.whereType<Project>()
+        .where((p) => p.id == widget.projectId)
+        .firstOrNull;
+
+    final color = _parseColor(project?.color);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(
+              project?.title ?? 'Project',
+              style: Theme.of(context).textTheme.titleLarge,
+            ),
+            if (project?.description?.isNotEmpty == true)
+              Text(
+                project!.description!,
+                style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                      color: Theme.of(context).colorScheme.onSurfaceVariant,
+                    ),
+                maxLines: 1,
+                overflow: TextOverflow.ellipsis,
+              ),
+          ],
+        ),
+      ),
+      body: tasksAsync.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (e, _) => Center(child: Text('Error loading tasks: $e')),
+        data: (tasks) => _buildBody(context, tasks, milestonesAsync, color),
+      ),
+    );
+  }
+
+  Widget _buildBody(
+    BuildContext context,
+    List<Task> tasks,
+    AsyncValue<List<Milestone>> milestonesAsync,
+    Color color,
+  ) {
+    final milestones = (milestonesAsync.value ?? []).toList()
+      ..sort((a, b) => a.orderIndex.compareTo(b.orderIndex));
+
+    // Group tasks by milestoneId.
+    final byMilestone = <int?, List<Task>>{};
+    for (final t in tasks) {
+      (byMilestone[t.milestoneId] ??= []).add(t);
+    }
+
+    final unassigned = byMilestone[null] ?? [];
+
+    if (tasks.isEmpty) {
+      return Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(Icons.check_box_outlined,
+                size: 48,
+                color: Theme.of(context).colorScheme.onSurfaceVariant),
+            const SizedBox(height: 12),
+            Text(
+              'No tasks in this project yet.',
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                    color: Theme.of(context).colorScheme.onSurfaceVariant,
+                  ),
+            ),
+          ],
+        ),
+      );
+    }
+
+    return RefreshIndicator(
+      onRefresh: () async {
+        setState(() => _pendingStatus.clear());
+        ref.invalidate(projectTasksProvider(widget.projectId));
+        ref.invalidate(projectMilestonesProvider(widget.projectId));
+      },
+      child: CustomScrollView(
+        slivers: [
+          // Top colour strip.
+          SliverToBoxAdapter(child: Container(height: 4, color: color)),
+
+          // Milestone sections.
+          for (final ms in milestones) ...[
+            SliverToBoxAdapter(
+              child: _MilestoneHeader(
+                milestone: ms,
+                tasks: byMilestone[ms.id] ?? [],
+                color: color,
+              ),
+            ),
+            if ((byMilestone[ms.id] ?? []).isNotEmpty)
+              SliverList.builder(
+                itemCount: byMilestone[ms.id]!.length,
+                itemBuilder: (_, i) {
+                  final task = byMilestone[ms.id]![i];
+                  return _TaskRow(
+                    task: task,
+                    effectiveStatus: _effectiveStatus(task),
+                    onStatusTap: () => _cycleStatus(task),
+                  );
+                },
+              ),
+          ],
+
+          // Unassigned tasks.
+          if (unassigned.isNotEmpty) ...[
+            SliverToBoxAdapter(
+              child: Padding(
+                padding: const EdgeInsets.fromLTRB(16, 20, 16, 6),
+                child: Text(
+                  'No milestone',
+                  style: Theme.of(context).textTheme.labelMedium?.copyWith(
+                        color: Theme.of(context).colorScheme.onSurfaceVariant,
+                        letterSpacing: 0.5,
+                      ),
+                ),
+              ),
+            ),
+            SliverList.builder(
+              itemCount: unassigned.length,
+              itemBuilder: (_, i) {
+                final task = unassigned[i];
+                return _TaskRow(
+                  task: task,
+                  effectiveStatus: _effectiveStatus(task),
+                  onStatusTap: () => _cycleStatus(task),
+                );
+              },
+            ),
+          ],
+
+          const SliverToBoxAdapter(child: SizedBox(height: 16)),
+        ],
+      ),
+    );
+  }
+}
+
+// ── Milestone section header ──────────────────────────────────────────────────
+
+class _MilestoneHeader extends StatelessWidget {
+  final Milestone milestone;
+  final List<Task> tasks;
+  final Color color;
+
+  const _MilestoneHeader({
+    required this.milestone,
+    required this.tasks,
+    required this.color,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final done = tasks.where((t) => t.status == TaskStatus.done).length;
+    final total = tasks.length;
+    final pct = total > 0 ? done / total : 0.0;
+
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(16, 20, 16, 6),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            children: [
+              Container(
+                width: 10,
+                height: 10,
+                decoration: BoxDecoration(color: color, shape: BoxShape.circle),
+              ),
+              const SizedBox(width: 8),
+              Expanded(
+                child: Text(
+                  milestone.title,
+                  style: theme.textTheme.titleSmall,
+                  maxLines: 1,
+                  overflow: TextOverflow.ellipsis,
+                ),
+              ),
+              const SizedBox(width: 8),
+              Text(
+                '$done / $total',
+                style: theme.textTheme.labelSmall?.copyWith(
+                  color: theme.colorScheme.onSurfaceVariant,
+                ),
+              ),
+            ],
+          ),
+          if (total > 0) ...[
+            const SizedBox(height: 4),
+            LinearProgressIndicator(
+              value: pct,
+              minHeight: 2,
+              color: color,
+              backgroundColor: color.withValues(alpha: 0.15),
+              borderRadius: BorderRadius.circular(1),
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+}
+
+// ── Task row ──────────────────────────────────────────────────────────────────
+
+class _TaskRow extends StatelessWidget {
+  final Task task;
+  final TaskStatus effectiveStatus;
+  final VoidCallback onStatusTap;
+
+  const _TaskRow({
+    required this.task,
+    required this.effectiveStatus,
+    required this.onStatusTap,
+  });
+
+  IconData get _statusIcon => switch (effectiveStatus) {
+        TaskStatus.done => Icons.check_circle,
+        TaskStatus.inProgress => Icons.timelapse,
+        TaskStatus.todo => Icons.radio_button_unchecked,
+      };
+
+  Color _statusColor(BuildContext context) {
+    final cs = Theme.of(context).colorScheme;
+    return switch (effectiveStatus) {
+      TaskStatus.done => const Color(0xFF22C55E),
+      TaskStatus.inProgress => cs.primary,
+      TaskStatus.todo => cs.onSurfaceVariant,
+    };
+  }
+
+  Color _priorityColor(BuildContext context) => switch (task.priority) {
+        TaskPriority.high => const Color(0xFFEF4444),
+        TaskPriority.medium => const Color(0xFFF59E0B),
+        _ => Colors.transparent,
+      };
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return Card(
+      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 3),
+      child: InkWell(
+        onTap: () => context
+            .push(Routes.taskEdit.replaceFirst(':id', '${task.id}')),
+        borderRadius: BorderRadius.circular(14),
+        child: Padding(
+          padding: const EdgeInsets.fromLTRB(4, 6, 14, 6),
+          child: Row(
+            children: [
+              IconButton(
+                icon: Icon(_statusIcon, color: _statusColor(context)),
+                onPressed: onStatusTap,
+                tooltip: 'Cycle status',
+                visualDensity: VisualDensity.compact,
+              ),
+              Expanded(
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      task.title.isNotEmpty ? task.title : 'Untitled',
+                      style: theme.textTheme.titleSmall?.copyWith(
+                        decoration: effectiveStatus == TaskStatus.done
+                            ? TextDecoration.lineThrough
+                            : null,
+                        color: effectiveStatus == TaskStatus.done
+                            ? theme.colorScheme.onSurfaceVariant
+                            : null,
+                      ),
+                      maxLines: 2,
+                      overflow: TextOverflow.ellipsis,
+                    ),
+                    if (task.dueDate != null) ...[
+                      const SizedBox(height: 2),
+                      Text(
+                        'Due ${_formatDate(task.dueDate!)}',
+                        style: theme.textTheme.labelSmall?.copyWith(
+                          color: task.dueDate!.isBefore(DateTime.now()) &&
+                                  effectiveStatus != TaskStatus.done
+                              ? const Color(0xFFEF4444)
+                              : theme.colorScheme.onSurfaceVariant,
+                        ),
+                      ),
+                    ],
+                  ],
+                ),
+              ),
+              if (task.priority == TaskPriority.high ||
+                  task.priority == TaskPriority.medium)
+                Container(
+                  width: 8,
+                  height: 8,
+                  decoration: BoxDecoration(
+                    color: _priorityColor(context),
+                    shape: BoxShape.circle,
+                  ),
+                ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+String _formatDate(DateTime dt) {
+  const months = [
+    'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
+    'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec',
+  ];
+  return '${months[dt.month - 1]} ${dt.day}';
+}
diff --git a/lib/widgets/library_item_card.dart b/lib/widgets/library_item_card.dart
index bfa29d0..ef0a970 100644
--- a/lib/widgets/library_item_card.dart
+++ b/lib/widgets/library_item_card.dart
@@ -210,7 +210,8 @@ class ProjectLibraryCard extends StatelessWidget {
       margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
       clipBehavior: Clip.antiAlias,
       child: InkWell(
-        onTap: () {}, // No project detail screen in this app
+        onTap: () => context
+            .push('/projects/${project.id}/tasks'),
         borderRadius: BorderRadius.circular(14),
         child: Row(
           children: [