feat(intelligence): implement Global AI Q&A screen and paywall blocker

- Implemented standard empty and active chat conversation states for the `/intelligence` page - Created interactive `AiResponseRenderer` with AOT-compliant sentence splitting and payment gateway simulation - Added scoped `LibraryStateService` to synchronize book ownership and updates across the application - Obfuscated paywalled content in DOM to prevent inspection bypass - Fixed local port connection mismatch by updating API configurations to use port 5104
2026-06-06 10:41:48 +02:00
parent bcd5daa3a0
commit faf6ec826e
15 changed files with 932 additions and 318 deletions
@@ -56,7 +56,7 @@ public static class MauiProgram
 			builder.Services.AddTransient<MobileAuthenticationHeaderHandler>();
 			builder.Services.AddHttpClient("NexusAPI", client =>
 			{
-				var apiBaseUrl = builder.Configuration["ApiSettings:BaseUrl"] ?? "http://localhost:5000";
+				var apiBaseUrl = builder.Configuration["ApiSettings:BaseUrl"] ?? "http://localhost:5104";
 				client.BaseAddress = new Uri(apiBaseUrl);
 			}).AddHttpMessageHandler<MobileAuthenticationHeaderHandler>();

@@ -74,6 +74,7 @@ public static class MauiProgram
 			builder.Services.AddScoped<IKnowledgeGraphService, KnowledgeGraphService>();
 			builder.Services.AddScoped<IReaderInteractionService, ReaderInteractionService>();
 			builder.Services.AddScoped<IReaderStateService, ReaderStateService>();
+			builder.Services.AddScoped<ILibraryStateService, LibraryStateService>();
 			builder.Services.AddScoped<KnowledgeCoordinator>();
 			builder.Services.AddScoped<ISyncService, SyncService>();
 			builder.Services.AddScoped<IIdentityService, IdentityService>();
@@ -1,6 +1,6 @@
 {
  "ApiSettings": {
-    "BaseUrl": "https://localhost:5000"
+    "BaseUrl": "http://localhost:5104"
  },
  "Serilog": {
    "Using": [
@@ -0,0 +1,244 @@
+@using NexusReader.UI.Shared.Models
+@using NexusReader.UI.Shared.Services
+@using NexusReader.Application.DTOs.AI
+@using NexusReader.Application.DTOs.User
+@using System.Net.Http.Json
+@inject HttpClient Http
+@inject ILibraryStateService LibraryStateService
+@inject NavigationManager NavigationManager
+
+<div class="message-row @(Message.Sender == "User" ? "user-row" : "ai-row")">
+    <div class="message-avatar">
+        @if (Message.Sender == "User")
+        {
+            <i class="bi bi-person-fill"></i>
+        }
+        else
+        {
+            <i class="bi bi-robot"></i>
+        }
+    </div>
+    
+    <div class="message-bubble @GetBubbleClass()">
+        <div class="message-header">
+            <span class="sender-name">@Message.Sender</span>
+            <span class="message-time">@Message.Timestamp.ToString("HH:mm")</span>
+        </div>
+        
+        <div class="message-content">
+            @if (Message.Sender == "User")
+            {
+                <p>@Message.Text</p>
+            }
+            else
+            {
+                @if (Message.IsPaywalled && !_isUnlocked)
+                {
+                    <div class="clear-teaser">
+                        @foreach (var segment in ParseSegments(Message.ClearText))
+                        {
+                            @if (segment.IsCitation)
+                            {
+                                <NexusCitationMarker SourceId="@segment.CitationId" Citations="@Message.Citations" />
+                            }
+                            else
+                            {
+                                @RenderMarkdown(segment.Text)
+                            }
+                        }
+                    </div>
+                    
+                    <div class="teaser-blur">
+                        @foreach (var segment in ParseSegments(Message.BlurredTeaserText))
+                        {
+                            @if (segment.IsCitation)
+                            {
+                                <NexusCitationMarker SourceId="@segment.CitationId" Citations="@Message.Citations" />
+                            }
+                            else
+                            {
+                                @RenderMarkdown(segment.Text)
+                            }
+                        }
+                    </div>
+                    
+                    <div class="upsell-card">
+                        <div class="upsell-header">
+                            <span class="upsell-icon">🔒</span>
+                            <h4>Zablokowano pełną odpowiedź (Paywall)</h4>
+                        </div>
+                        
+                        <p class="upsell-text">
+                            Powyższy fragment wiedzy pochodzi z materiału: 
+                            <strong>'@(string.IsNullOrEmpty(Message.SourceBookTitle) ? "Architektura .NET 10 i Ekosystem Blazor" : Message.SourceBookTitle)'</strong>. 
+                            Ta pozycja nie znajduje się w Twojej bibliotece (/my-books). Aby uzyskać dostęp do pełnych instrukcji technicznych oraz gotowych kodów C#, odblokuj ten materiał w katalogu.
+                        </p>
+                        
+                        <div class="upsell-actions">
+                            @if (_isSimulatingPayment)
+                            {
+                                <button class="btn-upsell btn-primary loading" disabled>
+                                    <div class="payment-spinner"></div>
+                                    PRZETWARZANIE PŁATNOŚCI...
+                                </button>
+                            }
+                            else
+                            {
+                                <button class="btn-upsell btn-primary" @onclick="HandlePurchase">
+                                    KUP PUBLIKACJĘ (29 PLN)
+                                </button>
+                            }
+                            <a href="/catalog" target="_blank" class="btn-upsell btn-secondary">
+                                Zobacz szczegóły w Katalogu
+                            </a>
+                        </div>
+                    </div>
+                }
+                else
+                {
+                    <div class="full-response">
+                        @foreach (var segment in Message.Segments)
+                        {
+                            @if (segment.IsCitation)
+                            {
+                                <NexusCitationMarker SourceId="@segment.CitationId" Citations="@Message.Citations" />
+                            }
+                            else
+                            {
+                                @RenderMarkdown(segment.Text)
+                            }
+                        }
+                    </div>
+                    
+                    @if (_showSuccessBanner)
+                    {
+                        <div class="success-unlock-banner">
+                            <span class="success-icon">✓</span>
+                            <span>Odblokowano pełną odpowiedź! Książka została dodana do Twojej biblioteki.</span>
+                        </div>
+                    }
+                }
+            }
+        </div>
+    </div>
+</div>
+
+@code {
+    [Parameter] public ChatMessage Message { get; set; } = default!;
+    [Parameter] public List<LastReadBookDto>? OwnedBooks { get; set; }
+
+    private string GetBubbleClass()
+    {
+        if (Message.Sender == "User") return "user-bubble";
+        return Message.IsPaywalled && !_isUnlocked ? "ai-bubble paywalled-bubble" : "ai-bubble";
+    }
+
+    private bool _isUnlocked = false;
+    private bool _isSimulatingPayment = false;
+    private bool _showSuccessBanner = false;
+
+    private async Task HandlePurchase()
+    {
+        if (_isSimulatingPayment) return;
+        
+        _isSimulatingPayment = true;
+        StateHasChanged();
+
+        // Simulate payment gateway delay (1.5 seconds)
+        await Task.Delay(1500);
+
+        try
+        {
+            var bookTitle = string.IsNullOrEmpty(Message.SourceBookTitle) 
+                ? "Architektura .NET 10 i Ekosystem Blazor" 
+                : Message.SourceBookTitle;
+
+            // Call POST endpoint to persist the purchase
+            var response = await Http.PostAsJsonAsync("api/library/purchase", new { Title = bookTitle });
+            if (response.IsSuccessStatusCode)
+            {
+                _isUnlocked = true;
+                Message.IsPaywalled = false;
+                _showSuccessBanner = true;
+                
+                // Fetch updated library list and update state manager
+                var updatedBooks = await Http.GetFromJsonAsync<List<LastReadBookDto>>("api/library/books");
+                LibraryStateService.OwnedBooks = updatedBooks;
+            }
+            else
+            {
+                Console.WriteLine("[AiResponseRenderer] Purchase failed on server.");
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"[AiResponseRenderer] Error processing purchase: {ex.Message}");
+        }
+        finally
+        {
+            _isSimulatingPayment = false;
+            StateHasChanged();
+        }
+    }
+
+    private List<ResponseSegment> ParseSegments(string text)
+    {
+        var segments = new List<ResponseSegment>();
+        if (string.IsNullOrEmpty(text)) return segments;
+
+        var regex = new System.Text.RegularExpressions.Regex(
+            @"\[Source ID:\s*([^\]]+)\]|\[([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})\]", 
+            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
+        var matches = regex.Matches(text);
+
+        int lastIndex = 0;
+        foreach (System.Text.RegularExpressions.Match match in matches)
+        {
+            if (match.Index > lastIndex)
+            {
+                segments.Add(new ResponseSegment
+                {
+                    Text = text.Substring(lastIndex, match.Index - lastIndex),
+                    IsCitation = false
+                });
+            }
+
+            var citationId = match.Groups[1].Success 
+                ? match.Groups[1].Value.Trim() 
+                : match.Groups[2].Value.Trim();
+
+            segments.Add(new ResponseSegment
+            {
+                IsCitation = true,
+                CitationId = citationId
+            });
+
+            lastIndex = match.Index + match.Length;
+        }
+
+        if (lastIndex < text.Length)
+        {
+            segments.Add(new ResponseSegment
+            {
+                Text = text.Substring(lastIndex),
+                IsCitation = false
+            });
+        }
+
+        return segments;
+    }
+
+    private MarkupString RenderMarkdown(string text)
+    {
+        if (string.IsNullOrEmpty(text)) return new MarkupString(string.Empty);
+
+        var html = System.Net.WebUtility.HtmlEncode(text);
+        html = System.Text.RegularExpressions.Regex.Replace(html, @"\*\*(.*?)\*\*", "<strong>$1</strong>");
+        html = System.Text.RegularExpressions.Regex.Replace(html, @"\*(.*?)\*", "<em>$1</em>");
+        html = System.Text.RegularExpressions.Regex.Replace(html, @"```(?:[a-zA-Z0-9+#]+)?\s*([\s\S]*?)\s*```", "<pre class=\"nexus-code-block\"><code>$1</code></pre>");
+        html = System.Text.RegularExpressions.Regex.Replace(html, @"`(.*?)`", "<code class=\"nexus-inline-code\">$1</code>");
+        html = html.Replace("\n", "<br />");
+
+        return new MarkupString(html);
+    }
+}
@@ -0,0 +1,269 @@
+.message-row {
+    display: flex;
+    gap: 1rem;
+    width: 100%;
+    max-width: 90%;
+    margin-bottom: 1.5rem;
+    animation: bubble-fade-in 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
+}
+
+.user-row {
+    align-self: flex-end;
+    margin-left: auto;
+    flex-direction: row-reverse;
+}
+
+.ai-row {
+    align-self: flex-start;
+    margin-right: auto;
+}
+
+.message-avatar {
+    width: 38px;
+    height: 38px;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    font-size: 1.1rem;
+    flex-shrink: 0;
+}
+
+.user-row .message-avatar {
+    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
+    color: #ffffff;
+    border: 1px solid rgba(255, 255, 255, 0.2);
+    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
+}
+
+.ai-row .message-avatar {
+    background: linear-gradient(135deg, #005f38 0%, #004024 100%);
+    color: #e6fffa;
+    border: 1px solid rgba(0, 255, 153, 0.4);
+    box-shadow: 0 0 10px rgba(0, 255, 153, 0.25);
+}
+
+.message-bubble {
+    padding: 1.25rem 1.5rem;
+    border-radius: 16px;
+    position: relative;
+    line-height: 1.6;
+    font-size: 0.975rem;
+    display: flex;
+    flex-direction: column;
+    width: 100%;
+}
+
+.user-bubble {
+    background: #1a1a1e;
+    border: 1px solid rgba(255, 255, 255, 0.05);
+    color: #e4e4e7;
+    border-top-right-radius: 4px;
+    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
+}
+
+.ai-bubble {
+    background: rgba(26, 26, 30, 0.6);
+    border: 1px solid rgba(255, 255, 255, 0.05);
+    color: #e2e8f0;
+    border-top-left-radius: 4px;
+    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.2);
+}
+
+.paywalled-bubble {
+    border-color: rgba(16, 185, 129, 0.15);
+}
+
+.message-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 0.75rem;
+    font-size: 0.75rem;
+    opacity: 0.6;
+}
+
+.sender-name {
+    font-weight: 700;
+    text-transform: uppercase;
+    letter-spacing: 0.5px;
+}
+
+.message-time {
+    font-family: monospace;
+}
+
+.message-content {
+    word-break: break-word;
+}
+
+/* Paragraph spacing */
+.message-content p {
+    margin: 0 0 1rem 0;
+}
+.message-content p:last-child {
+    margin-bottom: 0;
+}
+
+/* Paywall Blur Styles */
+.teaser-blur {
+    position: relative;
+    filter: blur(5px);
+    pointer-events: none;
+    -webkit-user-select: none;
+    user-select: none;
+    opacity: 0.35;
+    margin-top: 1rem;
+    margin-bottom: 1.5rem;
+    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 40%, rgba(0,0,0,0) 100%);
+    mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 40%, rgba(0,0,0,0) 100%);
+}
+
+/* Upsell Card */
+.upsell-card {
+    background: #1a1a1e;
+    border-radius: 12px;
+    border: 1px solid rgba(16, 185, 129, 0.2);
+    padding: 1.5rem;
+    margin-top: 1rem;
+    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
+    animation: card-slide-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
+}
+
+.upsell-header {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    margin-bottom: 0.75rem;
+}
+
+.upsell-icon {
+    font-size: 1.25rem;
+}
+
+.upsell-header h4 {
+    margin: 0;
+    color: #10b981;
+    font-size: 1.1rem;
+    font-weight: 700;
+    letter-spacing: 0.5px;
+}
+
+.upsell-text {
+    color: rgba(255, 255, 255, 0.75);
+    font-size: 0.9rem;
+    line-height: 1.55;
+    margin: 0 0 1.25rem 0;
+}
+
+.upsell-actions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 1rem;
+}
+
+.btn-upsell {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    padding: 0.75rem 1.5rem;
+    font-size: 0.85rem;
+    font-weight: 700;
+    text-transform: uppercase;
+    border-radius: 8px;
+    cursor: pointer;
+    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
+    text-decoration: none;
+    letter-spacing: 0.5px;
+    min-height: 44px;
+}
+
+.btn-primary {
+    background: #10b981;
+    border: none;
+    color: #121214;
+}
+
+.btn-primary:hover:not(:disabled) {
+    background: #0d9668;
+    transform: translateY(-2px);
+    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
+}
+
+.btn-primary:active:not(:disabled) {
+    transform: translateY(0);
+}
+
+.btn-primary:disabled {
+    background: rgba(16, 185, 129, 0.5);
+    color: rgba(18, 18, 20, 0.6);
+    cursor: not-allowed;
+}
+
+.btn-secondary {
+    background: transparent;
+    border: 1px solid #10b981;
+    color: #10b981;
+}
+
+.btn-secondary:hover {
+    background: rgba(16, 185, 129, 0.05);
+    transform: translateY(-2px);
+}
+
+.btn-secondary:active {
+    transform: translateY(0);
+}
+
+/* Success Banner */
+.success-unlock-banner {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    background: rgba(16, 185, 129, 0.1);
+    border: 1px solid rgba(16, 185, 129, 0.3);
+    color: #10b981;
+    padding: 1rem;
+    border-radius: 8px;
+    margin-top: 1.25rem;
+    font-size: 0.9rem;
+    font-weight: 600;
+    animation: fade-in 0.5s ease-out;
+}
+
+.success-icon {
+    font-weight: bold;
+    font-size: 1.1rem;
+}
+
+/* Payment Spinner */
+.payment-spinner {
+    width: 16px;
+    height: 16px;
+    border: 2px solid rgba(18, 18, 20, 0.2);
+    border-top-color: #121214;
+    border-radius: 50%;
+    margin-right: 0.75rem;
+    animation: spin 0.8s linear infinite;
+}
+
+/* Keyframes */
+@keyframes bubble-fade-in {
+    0% { opacity: 0; transform: translateY(12px) scale(0.98); }
+    100% { opacity: 1; transform: translateY(0) scale(1); }
+}
+
+@keyframes card-slide-in {
+    0% { opacity: 0; transform: translateY(10px); }
+    100% { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes fade-in {
+    from { opacity: 0; }
+    to { opacity: 1; }
+}
+
+@keyframes spin {
+    0% { transform: rotate(0deg); }
+    100% { transform: rotate(360deg); }
+}
@@ -28,6 +28,12 @@ public class ChatMessage
    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
    public List<ResponseSegment> Segments { get; set; } = new();
    public List<CitationDto> Citations { get; set; } = new();
+
+    public string ClearText { get; set; } = string.Empty;
+    public string BlurredTeaserText { get; set; } = string.Empty;
+    public bool IsPaywalled { get; set; }
+    public string SourceBookTitle { get; set; } = string.Empty;
+    public string DocumentId { get; set; } = string.Empty;
 }

 /// <summary>
@@ -1,5 +1,6 @@
@page "/catalog"
@attribute [Authorize]
+@implements IDisposable
@using NexusReader.UI.Shared.Components.Organisms
@using NexusReader.Application.DTOs.User
@using NexusReader.UI.Shared.Services
@@ -7,6 +8,7 @@
@inject HttpClient Http
@inject IReaderNavigationService ReaderNavigation
@inject NavigationManager NavigationManager
+@inject ILibraryStateService LibraryStateService

 <div class="catalog-page">
    <header class="catalog-header">
@@ -189,6 +191,11 @@
    private bool _isLoading = true;
    private List<LastReadBookDto>? _books;

+    protected override void OnInitialized()
+    {
+        LibraryStateService.OnBooksChanged += HandleBooksChanged;
+    }
+
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
@@ -197,6 +204,11 @@
        }
    }

+    private void HandleBooksChanged()
+    {
+        _ = InvokeAsync(LoadBooksAsync);
+    }
+
    private async Task LoadBooksAsync()
    {
        _isLoading = true;
@@ -231,4 +243,9 @@
        // Showcase callback
        NavigationManager.NavigateTo("/profile");
    }
+
+    public void Dispose()
+    {
+        LibraryStateService.OnBooksChanged -= HandleBooksChanged;
+    }
 }
@@ -1,35 +1,34 @@
@page "/intelligence"
@attribute [Authorize]
+@implements IDisposable
@using NexusReader.Application.DTOs.AI
@using NexusReader.Application.Abstractions.Services
@using NexusReader.Application.DTOs.User
+@using NexusReader.UI.Shared.Components.Molecules
@using NexusReader.UI.Shared.Components.Atoms
@using NexusReader.UI.Shared.Models
@using System.Net.Http.Json
@inject HttpClient Http
@inject IKnowledgeService KnowledgeService
@inject AuthenticationStateProvider AuthStateProvider
+@inject ILibraryStateService LibraryStateService

 <div class="intelligence-page">
-    <header class="intelligence-header">
-        <div class="header-title-section">
-            <h1 class="neon-glow-text">Global Intelligence</h1>
-            <p class="subtitle">Interrogate, explore, and synthesize grounded knowledge from your library using Polyglot KM-RAG</p>
-        </div>
-    </header>
-
-    <div class="intelligence-layout glass-panel">
+    <div class="intelligence-layout">
        <div class="chat-thread-container">
            @if (_chatMessages.Count == 0)
            {
                <div class="welcome-state">
                    <div class="welcome-icon">
-                        <svg width="64" height="64" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
-                            <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"></path>
+                        <svg width="80" height="80" viewBox="0 0 24 24" fill="none" stroke="#8b8273" stroke-width="1.25" stroke-linecap="round" stroke-linejoin="round">
+                            <path d="M12 22c5.523 0 10-4.477 10-10S17.523 2 12 2 2 6.477 2 12s4.477 10 10 10z" stroke-dasharray="2 2" stroke="rgba(139, 130, 115, 0.3)" />
+                            <path d="M12 6v12M8 8h8M6 12h12M8 16h8" stroke="rgba(139, 130, 115, 0.4)" />
+                            <path d="M9.5 4.5c-1.5 0-3 1.5-3 3.5s1.5 3 3 3h5c1.5 0 3-1 3-3s-1.5-3.5-3-3.5" />
+                            <path d="M9.5 19.5c-1.5 0-3-1.5-3-3.5s1.5-3 3-3h5c1.5 0 3 1 3 3s-1.5 3.5-3 3.5" />
+                            <circle cx="12" cy="12" r="2" fill="#8b8273" />
                        </svg>
                    </div>
-                    <h3>Start Interrogating Your Library</h3>
-                    <p>Ask complex questions across your entire ebook collection. The KM-RAG engine dynamically builds semantic maps, resolves dependencies, and formulates high-fidelity, grounded answers with interactive popover citations.</p>
+                    <div class="welcome-prompt">Zadaj pytanie globalne do całej biblioteki...</div>
                </div>
            }
            else
@@ -37,37 +36,7 @@
                <div class="chat-bubbles-scroll">
                    @foreach (var message in _chatMessages)
                    {
-                        <div class="message-row @(message.Sender == "User" ? "user-row" : "ai-row")" key="@message.Id">
-                            <div class="message-avatar">
-                                @if (message.Sender == "User")
-                                {
-                                    <i class="bi bi-person-fill"></i>
-                                }
-                                else
-                                {
-                                    <i class="bi bi-robot"></i>
-                                }
-                            </div>
-                            <div class="message-bubble @(message.Sender == "User" ? "user-bubble" : "ai-bubble")">
-                                <div class="message-header">
-                                    <span class="sender-name">@message.Sender</span>
-                                    <span class="message-time">@message.Timestamp.ToString("HH:mm")</span>
-                                </div>
-                                <div class="message-content">
-                                    @foreach (var segment in message.Segments)
-                                    {
-                                        @if (segment.IsCitation)
-                                        {
-                                            <NexusCitationMarker SourceId="@segment.CitationId" Citations="@message.Citations" />
-                                        }
-                                        else
-                                        {
-                                            @RenderMarkdown(segment.Text)
-                                        }
-                                    }
-                                </div>
-                            </div>
-                        </div>
+                        <AiResponseRenderer @key="message.Id" Message="@message" OwnedBooks="@_books" />
                    }

                    @if (_isLoading)
@@ -100,9 +69,9 @@
            <div class="input-panel-wrapper">
                <div class="scope-bar">
                    <div class="scope-selector">
-                        <label for="book-select"><i class="bi bi-compass"></i> Scope:</label>
+                        <label for="book-select">Scope:</label>
                        <select id="book-select" class="nexus-select" @bind="_selectedBookId">
-                            <option value="">All Books (Global Search)</option>
+                            <option value="">[ All Resources (Including Global Catalog) ]</option>
                            @if (_books != null)
                            {
                                @foreach (var book in _books)
@@ -121,7 +90,7 @@
                           @bind:event="oninput"
                           @onkeyup="HandleKeyUp"
                           disabled="@_isLoading" />
-                    <button class="btn-nexus btn-nexus-primary search-btn" 
+                    <button class="search-btn" 
                            disabled="@(string.IsNullOrWhiteSpace(_question) || _isLoading)" 
                            @onclick="AskQuestionAsync">
                        @if (_isLoading)
@@ -146,20 +115,52 @@
    private List<LastReadBookDto>? _books;
    private List<ChatMessage> _chatMessages = new();

-
-
    protected override async Task OnInitializedAsync()
+    {
+        LibraryStateService.OnBooksChanged += HandleBooksChanged;
+        await LoadBooksAsync();
+    }
+
+    private async Task LoadBooksAsync()
    {
        try
        {
            _books = await Http.GetFromJsonAsync<List<LastReadBookDto>>("api/library/books");
+            LibraryStateService.OwnedBooks = _books;
        }
        catch (Exception ex)
        {
-            Console.WriteLine($"[Intelligence] Failed to load books for scope selector: {ex.Message}");
+            Console.WriteLine($"[Intelligence] Failed to load books: {ex.Message}");
        }
    }

+    private void HandleBooksChanged()
+    {
+        _ = InvokeAsync(async () =>
+        {
+            _books = LibraryStateService.OwnedBooks;
+            
+            // Check if any existing message in the chat thread was paywalled,
+            // and update its owned state dynamically.
+            if (_books != null)
+            {
+                foreach (var message in _chatMessages)
+                {
+                    if (message.IsPaywalled && !string.IsNullOrEmpty(message.SourceBookTitle))
+                    {
+                        var isNowOwned = _books.Any(b => b.Title.Equals(message.SourceBookTitle, StringComparison.OrdinalIgnoreCase));
+                        if (isNowOwned)
+                        {
+                            message.IsPaywalled = false;
+                        }
+                    }
+                }
+            }
+            
+            StateHasChanged();
+        });
+    }
+
    private async Task HandleKeyUp(KeyboardEventArgs e)
    {
        if (e.Key == "Enter" && !string.IsNullOrWhiteSpace(_question) && !_isLoading)
@@ -176,7 +177,7 @@
        _question = string.Empty; // Clear input field immediately
        _isLoading = true;

-        // Add user query message
+        // Add user query message with custom background in renderer
        _chatMessages.Add(new ChatMessage
        {
            Sender = "User",
@@ -201,13 +202,41 @@
            if (result.IsSuccess)
            {
                var response = result.Value;
-                _chatMessages.Add(new ChatMessage
+                
+                // --- Paywall Simulation Logic ---
+                // If the user does not own "Architektura .NET 10 i Ekosystem Blazor"
+                // and the question refers to Blazor/architecture/C#/etc,
+                // we simulate that the RAG search pulled a citation from that unowned book.
+                var hasBlazorBook = _books != null && _books.Any(b => b.Title.Contains("Architektura .NET 10", StringComparison.OrdinalIgnoreCase));
+                var isSimulatingPaywall = !hasBlazorBook && 
+                    (userQuestion.Contains("blazor", StringComparison.OrdinalIgnoreCase) || 
+                     userQuestion.Contains("net", StringComparison.OrdinalIgnoreCase) ||
+                     userQuestion.Contains("architektura", StringComparison.OrdinalIgnoreCase) ||
+                     userQuestion.Contains("c#", StringComparison.OrdinalIgnoreCase));
+
+                if (isSimulatingPaywall)
                {
-                    Sender = "AI",
-                    Text = response.Answer,
-                    Segments = ParseSegments(response.Answer),
-                    Citations = response.Citations
-                });
+                    var mockCitationId = Guid.NewGuid().ToString();
+                    var mockCitation = new CitationDto
+                    {
+                        CitationId = mockCitationId,
+                        SourceBook = "Architektura .NET 10 i Ekosystem Blazor",
+                        Author = "Nexus Architect",
+                        Snippet = "Konfiguracja kontenera dependency injection w standardzie .NET 10 Blazor przy użyciu Native AOT wymaga wyeliminowania dynamicznej refleksji.",
+                        PageNumber = 42
+                    };
+                    
+                    if (response.Citations == null)
+                    {
+                        response.Citations = new List<CitationDto>();
+                    }
+                    response.Citations.Add(mockCitation);
+                    
+                    response.Answer = "Aby poprawnie skonfigurować architekturę .NET 10 Blazor pod Native AOT, należy unikać dynamicznego ładowania typów. Konieczne jest używanie generatorów kodu źródłowego (Source Generators) do rejestracji zależności w kontenerze DI. W ten sposób kompilator AOT może przeanalizować graf zależności podczas kompilacji. [Source ID: " + mockCitationId + "]\n\nPełny przykładowy kod konfiguracji Program.cs wygląda następująco:\n```csharp\nvar builder = WebApplication.CreateBuilder(args);\nbuilder.Services.AddSingleton<IService, AotService>();\n```";
+                }
+                
+                var chatMsg = CreateAiChatMessage(response, _books);
+                _chatMessages.Add(chatMsg);
            }
            else
            {
@@ -237,12 +266,85 @@
        }
    }

+    private ChatMessage CreateAiChatMessage(GroundedResponseDto response, List<LastReadBookDto>? ownedBooks)
+    {
+        var msg = new ChatMessage
+        {
+            Sender = "AI",
+            Text = response.Answer,
+            Segments = ParseSegments(response.Answer),
+            Citations = response.Citations
+        };
+
+        // Check if paywalled: citations contain a book not in ownedBooks
+        var unownedCitation = response.Citations.FirstOrDefault(c => 
+            !string.IsNullOrEmpty(c.SourceBook) && 
+            (ownedBooks == null || !ownedBooks.Any(ob => ob.Title.Equals(c.SourceBook, StringComparison.OrdinalIgnoreCase))));
+
+        if (unownedCitation != null)
+        {
+            msg.IsPaywalled = true;
+            msg.SourceBookTitle = unownedCitation.SourceBook;
+            
+            // Split sentences *once* during creation for Native AOT rendering performance
+            var (clear, _) = SplitSentences(response.Answer);
+            msg.ClearText = clear;
+            msg.BlurredTeaserText = "\n\n// [Blokada Paywall] Pełna treść oraz kody źródłowe C# zostały zablokowane.\npublic class ArchitekturaProcessor {\n    public async Task ProcessAsync() {\n        // Zaimplementuj wzorzec CQRS...\n        throw new PaywallException(\"Kup publikację w katalogu\");\n    }\n}";
+        }
+        else
+        {
+            msg.IsPaywalled = false;
+            msg.ClearText = response.Answer;
+            msg.BlurredTeaserText = string.Empty;
+        }
+
+        return msg;
+    }
+
+    private (string ClearText, string BlurredText) SplitSentences(string text)
+    {
+        if (string.IsNullOrEmpty(text)) return (string.Empty, string.Empty);
+        
+        int sentenceCount = 0;
+        int firstSplit = -1;
+        int secondSplit = -1;
+        
+        for (int i = 0; i < text.Length; i++)
+        {
+            char c = text[i];
+            if (c == '.' || c == '?' || c == '!')
+            {
+                if (i + 1 == text.Length || char.IsWhiteSpace(text[i + 1]))
+                {
+                    sentenceCount++;
+                    if (sentenceCount == 1)
+                    {
+                        firstSplit = i + 1;
+                    }
+                    else if (sentenceCount == 2)
+                    {
+                        secondSplit = i + 1;
+                        break;
+                    }
+                }
+            }
+        }
+        
+        int splitIndex = secondSplit != -1 ? secondSplit : firstSplit;
+        
+        if (splitIndex != -1 && splitIndex < text.Length)
+        {
+            return (text.Substring(0, splitIndex), text.Substring(splitIndex));
+        }
+        
+        return (text, string.Empty);
+    }
+
    private List<ResponseSegment> ParseSegments(string text)
    {
        var segments = new List<ResponseSegment>();
        if (string.IsNullOrEmpty(text)) return segments;

-        // Matches [Source ID: some-id] OR raw GUIDs in brackets [e225e58f-7539-cd51-e0ab-82741ec7e65c]
        var regex = new System.Text.RegularExpressions.Regex(
            @"\[Source ID:\s*([^\]]+)\]|\[([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})\]", 
            System.Text.RegularExpressions.RegexOptions.IgnoreCase);
@@ -285,28 +387,8 @@
        return segments;
    }

-    private MarkupString RenderMarkdown(string text)
+    public void Dispose()
    {
-        if (string.IsNullOrEmpty(text)) return new MarkupString(string.Empty);
-
-        // 1. HTML Encode to prevent XSS
-        var html = System.Net.WebUtility.HtmlEncode(text);
-
-        // 2. Bold: **text** -> <strong>text</strong>
-        html = System.Text.RegularExpressions.Regex.Replace(html, @"\*\*(.*?)\*\*", "<strong>$1</strong>");
-
-        // 3. Italic: *text* -> <em>text</em>
-        html = System.Text.RegularExpressions.Regex.Replace(html, @"\*(.*?)\*", "<em>$1</em>");
-
-        // 4. Code blocks: ```language ... ``` -> <pre class="nexus-code-block"><code>...</code></pre>
-        html = System.Text.RegularExpressions.Regex.Replace(html, @"```(?:[a-zA-Z0-9+#]+)?\s*([\s\S]*?)\s*```", "<pre class=\"nexus-code-block\"><code>$1</code></pre>");
-
-        // 5. Inline Code: `code` -> <code class="nexus-inline-code">code</code>
-        html = System.Text.RegularExpressions.Regex.Replace(html, @"`(.*?)`", "<code class=\"nexus-inline-code\">$1</code>");
-
-        // 6. Newlines: \n -> <br />
-        html = html.Replace("\n", "<br />");
-
-        return new MarkupString(html);
+        LibraryStateService.OnBooksChanged -= HandleBooksChanged;
    }
 }
@@ -1,33 +1,18 @@
 .intelligence-page {
-    padding: 2rem;
-    max-width: 1100px;
-    margin: 0 auto;
-    height: calc(100vh - 100px);
+    margin: -2.5rem;
+    height: 100vh;
+    background: #121214;
    display: flex;
    flex-direction: column;
-    animation: fadeIn 0.5s ease-out;
+    overflow: hidden;
+    animation: fadeIn 0.4s ease-out;
 }

-.intelligence-header {
-    margin-bottom: 1.5rem;
-    flex-shrink: 0;
-}
-
-.neon-glow-text {
-    font-family: var(--nexus-font-sans);
-    font-size: 2.5rem;
-    font-weight: 800;
-    margin: 0 0 0.25rem 0;
-    background: linear-gradient(135deg, var(--nexus-neon) 0%, rgba(0, 255, 153, 0.7) 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    filter: drop-shadow(0 0 8px rgba(0, 255, 153, 0.2));
-}
-
-.subtitle {
-    font-size: 0.95rem;
-    color: rgba(255, 255, 255, 0.6);
-    margin: 0;
+@media (max-width: 768px) {
+    .intelligence-page {
+        margin: -1.25rem;
+        height: calc(100vh - 60px);
+    }
 }

 .intelligence-layout {
@@ -35,202 +20,90 @@
    display: flex;
    flex-direction: column;
    overflow: hidden;
-    padding: 0;
+    height: 100%;
 }

 .chat-thread-container {
    flex-grow: 1;
    overflow-y: auto;
-    padding: 2rem;
+    padding: 3rem 4rem 2rem 4rem;
    display: flex;
    flex-direction: column;
 }

+@media (max-width: 768px) {
+    .chat-thread-container {
+        padding: 1.5rem 1rem;
+    }
+}
+
 /* Custom Scrollbars */
 .chat-thread-container::-webkit-scrollbar {
    width: 6px;
 }
 .chat-thread-container::-webkit-scrollbar-track {
-    background: rgba(255, 255, 255, 0.01);
+    background: transparent;
 }
 .chat-thread-container::-webkit-scrollbar-thumb {
-    background: rgba(0, 255, 153, 0.2);
+    background: rgba(16, 185, 129, 0.2);
    border-radius: 4px;
 }
 .chat-thread-container::-webkit-scrollbar-thumb:hover {
-    background: rgba(0, 255, 153, 0.4);
+    background: rgba(16, 185, 129, 0.4);
 }

 .chat-bubbles-scroll {
    display: flex;
    flex-direction: column;
-    gap: 1.5rem;
    width: 100%;
 }

-.message-row {
-    display: flex;
-    gap: 1rem;
-    width: 100%;
-    max-width: 85%;
-    animation: bubble-fade-in 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
-}
-
-.user-row {
-    align-self: flex-end;
-    flex-direction: row-reverse;
-}
-
-.ai-row {
-    align-self: flex-start;
-}
-
-.message-avatar {
-    width: 38px;
-    height: 38px;
-    border-radius: 50%;
+/* State 1: Initial Empty Screen */
+.welcome-state {
+    text-align: center;
+    padding: 4rem 2rem;
    display: flex;
+    flex-direction: column;
    align-items: center;
    justify-content: center;
-    font-size: 1.1rem;
-    flex-shrink: 0;
+    margin-top: auto;
+    margin-bottom: auto;
+    animation: fade-in-up 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
 }

-.user-row .message-avatar {
-    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
-    color: #ffffff;
-    border: 1px solid rgba(255, 255, 255, 0.2);
-    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
+.welcome-icon {
+    margin-bottom: 2rem;
+    filter: drop-shadow(0 0 15px rgba(139, 130, 115, 0.15));
 }

-.ai-row .message-avatar {
-    background: linear-gradient(135deg, #005f38 0%, #004024 100%);
-    color: #e6fffa;
-    border: 1px solid rgba(0, 255, 153, 0.4);
-    box-shadow: 0 0 10px rgba(0, 255, 153, 0.25);
-}
-
-.message-bubble {
-    padding: 1.25rem 1.5rem;
-    border-radius: var(--radius-lg);
-    position: relative;
-    line-height: 1.6;
-    font-size: 0.975rem;
-}
-
-.user-bubble {
-    background: rgba(255, 255, 255, 0.05);
-    border: 1px solid rgba(255, 255, 255, 0.1);
-    color: #ffffff;
-    border-top-right-radius: 4px;
-    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
-}
-
-.ai-bubble {
-    background: rgba(10, 20, 30, 0.55);
-    border: 1px solid rgba(0, 255, 153, 0.2);
-    color: #e2e8f0;
-    border-top-left-radius: 4px;
-    box-shadow: 0 4px 15px rgba(0, 255, 153, 0.05);
-    flex-grow: 1;
-}
-
-.message-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    margin-bottom: 0.5rem;
-    font-size: 0.75rem;
-    opacity: 0.6;
-}
-
-.sender-name {
-    font-weight: 700;
-    text-transform: uppercase;
-    letter-spacing: 0.5px;
-}
-
-.message-time {
-    font-family: monospace;
-}
-
-.message-content {
-    word-break: break-word;
-}
-
-/* Paragraph Spacing & Markdown */
-.message-content p {
-    margin: 0 0 1rem 0;
-}
-.message-content p:last-child {
-    margin-bottom: 0;
-}
-
-.nexus-code-block {
-    background: rgba(0, 0, 0, 0.4) !important;
-    border: 1px solid rgba(255, 255, 255, 0.08) !important;
-    border-radius: var(--radius-sm);
-    padding: 1rem;
-    margin: 1rem 0;
-    overflow-x: auto;
-    font-family: 'Fira Code', monospace;
-    font-size: 0.85rem;
-    color: #a7f3d0;
-}
-
-.nexus-inline-code {
-    background: rgba(255, 255, 255, 0.06);
-    border: 1px solid rgba(255, 255, 255, 0.1);
-    border-radius: 4px;
-    padding: 0.15rem 0.35rem;
-    font-family: monospace;
-    font-size: 0.9em;
-    color: #f472b6; /* Light pink for inline code */
-}
-
-/* Pending State Bubble */
-.pending-bubble {
-    border-color: rgba(0, 255, 153, 0.4);
-    box-shadow: 0 0 15px rgba(0, 255, 153, 0.1);
-}
-
-.typing-indicator {
-    display: flex;
-    gap: 4px;
-    align-items: center;
-    margin-bottom: 0.5rem;
-}
-
-.typing-indicator span {
-    width: 8px;
-    height: 8px;
-    background: var(--nexus-neon);
-    border-radius: 50%;
-    display: inline-block;
-    animation: typing-bounce 1.4s infinite ease-in-out both;
-}
-
-.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
-.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
-
-.loading-label {
-    font-size: 0.85rem;
-    color: rgba(255, 255, 255, 0.5);
-    font-style: italic;
+.welcome-prompt {
+    font-family: var(--nexus-font-sans, inherit);
+    color: #e4e4e7;
+    font-size: 1.35rem;
+    font-weight: 500;
+    letter-spacing: -0.2px;
 }

 /* Input Controls */
 .chat-input-controls {
-    padding: 1.5rem 2rem 2rem 2rem;
-    background: rgba(0, 0, 0, 0.2);
-    border-top: 1px solid rgba(255, 255, 255, 0.05);
+    padding: 1.5rem 4rem 3rem 4rem;
+    background: linear-gradient(to top, #121214 70%, rgba(18, 18, 20, 0));
    flex-shrink: 0;
 }

+@media (max-width: 768px) {
+    .chat-input-controls {
+        padding: 1rem 1rem 1.5rem 1rem;
+    }
+}
+
 .input-panel-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
+    max-width: 900px;
+    margin: 0 auto;
+    width: 100%;
 }

 .scope-bar {
@@ -241,46 +114,48 @@
 .scope-selector {
    display: flex;
    align-items: center;
-    gap: 0.5rem;
+    gap: 0.6rem;
    font-size: 0.85rem;
-    color: rgba(255, 255, 255, 0.5);
+    font-weight: 500;
+    color: #8b8273;
 }

 .nexus-select {
-    background: rgba(255, 255, 255, 0.02);
-    border: 1px solid rgba(255, 255, 255, 0.08);
-    color: #ffffff;
-    padding: 0.35rem 2rem 0.35rem 0.75rem;
-    border-radius: var(--radius-sm);
+    background: #1a1a1e;
+    border: 1px solid rgba(255, 255, 255, 0.06);
+    color: #e4e4e7;
+    padding: 0.4rem 2rem 0.4rem 0.75rem;
+    border-radius: 8px;
    outline: none;
    cursor: pointer;
-    font-size: 0.85rem;
-    transition: all 0.3s ease;
+    font-size: 0.825rem;
+    transition: all 0.25s ease;
    appearance: none;
-    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
+    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238b8273' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 0.85em;
 }

 .nexus-select:focus {
-    border-color: var(--nexus-neon);
-    box-shadow: 0 0 8px rgba(0, 255, 153, 0.2);
+    border-color: #10b981;
+    box-shadow: 0 0 8px rgba(16, 185, 129, 0.15);
 }

 .input-field-group {
    display: flex;
-    background: rgba(255, 255, 255, 0.02);
-    border: 1px solid rgba(255, 255, 255, 0.08);
-    border-radius: var(--radius-md);
-    padding: 0.35rem;
+    background: #1a1a1e;
+    border: 1px solid rgba(255, 255, 255, 0.06);
+    border-radius: 12px;
+    padding: 0.4rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
 }

 .input-field-group:focus-within {
-    border-color: var(--nexus-neon);
-    background: rgba(0, 255, 153, 0.01);
-    box-shadow: 0 0 15px rgba(0, 255, 153, 0.15);
+    border-color: rgba(16, 185, 129, 0.5);
+    background: #1a1a1e;
+    box-shadow: 0 10px 35px rgba(16, 185, 129, 0.1);
 }

 .nexus-input {
@@ -288,68 +163,92 @@
    background: transparent;
    border: none;
    color: #ffffff;
-    font-size: 1rem;
+    font-size: 0.975rem;
    outline: none;
    padding: 0.5rem 1rem;
 }

 .nexus-input::placeholder {
-    color: rgba(255, 255, 255, 0.35);
+    color: #8b8273;
 }

 .search-btn {
-    width: 46px;
-    height: 46px;
-    padding: 0 !important;
+    width: 44px;
+    height: 44px;
+    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
+    border-radius: 8px;
+    background: #10b981;
+    border: none;
+    color: #121214;
+    cursor: pointer;
+    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
 }

-.welcome-state {
-    text-align: center;
-    color: rgba(255, 255, 255, 0.5);
-    padding: 4rem 2rem;
+.search-btn:hover:not(:disabled) {
+    background: #0d9668;
+    transform: scale(1.02);
+}
+
+.search-btn:disabled {
+    background: rgba(26, 26, 30, 0.8);
+    color: rgba(255, 255, 255, 0.2);
+    border: 1px solid rgba(255, 255, 255, 0.02);
+    cursor: not-allowed;
+}
+
+/* Typing / Loading Indicators */
+.message-bubble.pending-bubble {
+    border-color: rgba(16, 185, 129, 0.25);
+    background: rgba(16, 185, 129, 0.03);
+    max-width: 450px;
+}
+
+.typing-indicator {
    display: flex;
-    flex-direction: column;
+    gap: 4px;
    align-items: center;
-    justify-content: center;
-    height: 100%;
+    margin-bottom: 0.6rem;
 }

-.welcome-icon {
-    color: rgba(0, 255, 153, 0.4);
-    margin-bottom: 1.5rem;
-    filter: drop-shadow(0 0 10px rgba(0, 255, 153, 0.2));
-    animation: pulse 2.5s infinite alternate;
+.typing-indicator span {
+    width: 7px;
+    height: 7px;
+    background: #10b981;
+    border-radius: 50%;
+    display: inline-block;
+    animation: typing-bounce 1.4s infinite ease-in-out both;
 }

-.welcome-state h3 {
-    color: #ffffff;
-    font-size: 1.5rem;
-    margin: 0 0 0.75rem 0;
-}
+.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
+.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

-.welcome-state p {
-    max-width: 550px;
-    margin: 0;
-    font-size: 0.95rem;
-    line-height: 1.6;
+.loading-label {
+    font-size: 0.825rem;
+    color: rgba(255, 255, 255, 0.45);
+    font-style: italic;
 }

 .btn-spinner {
-    width: 20px;
-    height: 20px;
-    border: 2px solid rgba(0, 0, 0, 0.1);
+    width: 18px;
+    height: 18px;
+    border: 2px solid rgba(18, 18, 20, 0.1);
    border-radius: 50%;
-    border-top-color: #000000;
+    border-top-color: #121214;
    animation: spin 0.8s linear infinite;
 }

-/* Keyframe Animations */
-@keyframes bubble-fade-in {
-    0% { opacity: 0; transform: translateY(10px) scale(0.98); }
-    100% { opacity: 1; transform: translateY(0) scale(1); }
+/* Animations */
+@keyframes fadeIn {
+    from { opacity: 0; }
+    to { opacity: 1; }
+}
+
+@keyframes fade-in-up {
+    0% { opacity: 0; transform: translateY(15px); }
+    100% { opacity: 1; transform: translateY(0); }
 }

@keyframes typing-bounce {
@@ -357,11 +256,6 @@
    50% { transform: translateY(-4px); }
 }

-@keyframes pulse {
-    0% { transform: scale(0.96); opacity: 0.8; }
-    100% { transform: scale(1.04); opacity: 1; }
-}
-
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
@@ -1,11 +1,13 @@
@page "/my-books"
@attribute [Authorize]
+@implements IDisposable
@using NexusReader.UI.Shared.Components.Organisms
@using NexusReader.Application.DTOs.User
@using NexusReader.UI.Shared.Services
@using System.Net.Http.Json
@inject HttpClient Http
@inject IReaderNavigationService ReaderNavigation
+@inject ILibraryStateService LibraryStateService

 <div class="my-books-page">
    <header class="my-books-header">
@@ -108,6 +110,11 @@
    private bool _isLoading = true;
    private List<LastReadBookDto>? _books;

+    protected override void OnInitialized()
+    {
+        LibraryStateService.OnBooksChanged += HandleBooksChanged;
+    }
+
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
@@ -116,6 +123,11 @@
        }
    }

+    private void HandleBooksChanged()
+    {
+        _ = InvokeAsync(LoadBooksAsync);
+    }
+
    private async Task LoadBooksAsync()
    {
        _isLoading = true;
@@ -149,4 +161,9 @@
    {
        ReaderNavigation.NavigateToBook(bookId);
    }
+
+    public void Dispose()
+    {
+        LibraryStateService.OnBooksChanged -= HandleBooksChanged;
+    }
 }
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using NexusReader.Application.DTOs.User;
+
+namespace NexusReader.UI.Shared.Services;
+
+public interface ILibraryStateService
+{
+    List<LastReadBookDto>? OwnedBooks { get; set; }
+    event Action? OnBooksChanged;
+    void NotifyBooksChanged();
+}
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using NexusReader.Application.DTOs.User;
+
+namespace NexusReader.UI.Shared.Services;
+
+public class LibraryStateService : ILibraryStateService
+{
+    private List<LastReadBookDto>? _ownedBooks;
+
+    public List<LastReadBookDto>? OwnedBooks
+    {
+        get => _ownedBooks;
+        set
+        {
+            _ownedBooks = value;
+            NotifyBooksChanged();
+        }
+    }
+
+    public event Action? OnBooksChanged;
+
+    public void NotifyBooksChanged()
+    {
+        OnBooksChanged?.Invoke();
+    }
+}
@@ -27,6 +27,7 @@ builder.Services.AddScoped<IReaderNavigationService, ReaderNavigationService>();
 builder.Services.AddScoped<IKnowledgeGraphService, KnowledgeGraphService>();
 builder.Services.AddScoped<IReaderInteractionService, ReaderInteractionService>();
 builder.Services.AddScoped<IReaderStateService, ReaderStateService>();
+builder.Services.AddScoped<ILibraryStateService, LibraryStateService>();
 builder.Services.AddScoped<KnowledgeCoordinator>();
 builder.Services.AddScoped<ISyncService, SyncService>();

@@ -57,6 +57,7 @@ builder.Services.AddScoped<IReaderNavigationService, ReaderNavigationService>();
 builder.Services.AddScoped<IKnowledgeGraphService, KnowledgeGraphService>();
 builder.Services.AddScoped<IReaderInteractionService, ReaderInteractionService>();
 builder.Services.AddScoped<IReaderStateService, ReaderStateService>();
+builder.Services.AddScoped<ILibraryStateService, LibraryStateService>();
 builder.Services.AddScoped<KnowledgeCoordinator>();
 builder.Services.AddScoped<ISyncService, SyncService>();

@@ -454,6 +455,48 @@ app.MapGet("/api/library/books", async (ClaimsPrincipal user, IMediator mediator
    return Results.BadRequest(errorMsg);
 }).RequireAuthorization();

+app.MapPost("/api/library/purchase", async (
+    ClaimsPrincipal user,
+    [FromBody] PurchaseBookRequest request,
+    IDbContextFactory<AppDbContext> dbContextFactory) =>
+{
+    var userId = user.FindFirstValue(ClaimTypes.NameIdentifier);
+    if (string.IsNullOrEmpty(userId)) return Results.Unauthorized();
+
+    using var dbContext = await dbContextFactory.CreateDbContextAsync();
+    
+    // Find or create author
+    var authorName = "Nexus Architect";
+    var author = await dbContext.Authors.FirstOrDefaultAsync(a => a.Name == authorName);
+    if (author == null)
+    {
+        author = new Author { Name = authorName };
+        dbContext.Authors.Add(author);
+        await dbContext.SaveChangesAsync();
+    }
+
+    // Check if the book already exists for the user
+    var bookExists = await dbContext.Ebooks.AnyAsync(e => e.UserId == userId && e.Title == request.Title);
+    if (!bookExists)
+    {
+        var newBook = new Ebook
+        {
+            Title = request.Title,
+            AuthorId = author.Id,
+            UserId = userId,
+            FilePath = "wwwroot/assets/book.epub",
+            AddedDate = DateTime.UtcNow,
+            Progress = 0,
+            Description = "Zaawansowany kurs budowania skalowalnych SaaS z Native AOT, CQRS, MediatR, FluentResults i izolowanym systemem stylów Blazor CSS.",
+            IsReadyForReading = true
+        };
+        dbContext.Ebooks.Add(newBook);
+        await dbContext.SaveChangesAsync();
+    }
+
+    return Results.Ok();
+}).RequireAuthorization();
+
 app.MapGet("/api/book/{bookId:guid}/concepts-map", async (
    Guid bookId,
    ClaimsPrincipal user,
@@ -729,3 +772,4 @@ public record KnowledgeRequest(string Text, Guid? EbookId = null);
 public record GroundednessRequest(string Answer, string Context);
 public record SemanticSearchRequest(string QueryText, int Limit = 5);
 public record AskQuestionRequest(string Question, Guid? EbookId = null, int Limit = 5);
+public record PurchaseBookRequest(string Title);
@@ -9,5 +9,5 @@
    "AllowRegistration": false,
    "AllowPasswordReset": false
  },
-  "ApiBaseUrl": "http://localhost:5000"
+  "ApiBaseUrl": "http://localhost:5104"
 }
@@ -31,5 +31,5 @@
      "MaxOutputTokens": 8192
    }
  },
-  "ApiBaseUrl": "http://localhost:5000"
+  "ApiBaseUrl": "http://localhost:5104"
 }