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<!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ExamPrep Pro - Intelligente Prüfungsvorbereitung</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        .dropzone {
            border: 2px dashed #3b82f6;
            transition: all 0.3s ease;
        }
        .dropzone.active {
            border-color: #10b981;
            background-color: #f0fdf4;
        }
        .progress-bar {
            transition: width 0.5s ease;
        }
        .topic-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            gap: 12px;
        }
        .topic-item {
            padding: 8px 16px;
            border-radius: 9999px;
            transition: all 0.3s ease;
        }
        .topic-item:hover {
            transform: scale(1.1);
        }
        .question-card {
            transition: all 0.2s ease;
        }
        .question-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .solution {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease;
        }
        .solution.open {
            max-height: 500px;
        }
        @media (max-width: 640px) {
            .topic-item {
                padding: 6px 12px;
                font-size: 0.875rem;
            }
        }
    </style>
</head>
<body class="bg-gray-50 min-h-screen font-sans">
    <!-- Header -->
    <header class="bg-white shadow-sm">
        <div class="container mx-auto px-4 py-6 flex justify-between items-center">
            <div class="flex items-center space-x-2">
                <i class="fas fa-graduation-cap text-3xl text-blue-600"></i>
                <h1 class="text-2xl font-bold text-gray-800">ExamPrep Pro</h1>
            </div>
            <nav class="hidden md:flex space-x-6">
                <a href="#" class="text-blue-600 font-medium">Startseite</a>
                <a href="#" class="text-gray-600 hover:text-blue-600">Funktionen</a>
                <a href="#" class="text-gray-600 hover:text-blue-600">Hilfe</a>
                <a href="#" class="text-gray-600 hover:text-blue-600">Über uns</a>
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            <button class="md:hidden text-gray-600">
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            </button>
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    <!-- Main Content -->
    <main class="container mx-auto px-4 py-8">
        <!-- Hero Section -->
        <section class="text-center mb-16">
            <h2 class="text-4xl font-bold text-gray-800 mb-4">Intelligente Prüfungsvorbereitung</h2>
            <p class="text-xl text-gray-600 max-w-3xl mx-auto mb-8">
                Analysiere vergangene Prüfungen und erhalte maßgeschneiderte Übungstests mit KI-Unterstützung.
                Perfekt für Studierende und Dozierende.
            </p>
            <div class="flex justify-center space-x-4">
                <button id="startAnalysisBtn" class="bg-blue-600 hover:bg-blue-700 text-white font-medium py-3 px-6 rounded-lg transition">
                    Jetzt beginnen <i class="fas fa-arrow-right ml-2"></i>
                </button>
                <button class="border border-blue-600 text-blue-600 hover:bg-blue-50 font-medium py-3 px-6 rounded-lg transition">
                    Mehr erfahren
                </button>
            </div>
        </section>

        <!-- Upload Section -->
        <section id="uploadSection" class="bg-white rounded-xl shadow-md p-8 mb-12 max-w-4xl mx-auto">
            <div class="text-center mb-8">
                <h3 class="text-2xl font-bold text-gray-800 mb-2">Prüfungen hochladen</h3>
                <p class="text-gray-600">
                    Lade mindestens 3 Prüfungen desselben Moduls hoch (PDF bevorzugt). Je mehr Prüfungen, desto besser die Analyse.
                </p>
            </div>
            
            <div id="dropzone" class="dropzone rounded-xl p-12 text-center cursor-pointer mb-6">
                <div class="flex flex-col items-center justify-center">
                    <i class="fas fa-cloud-upload-alt text-5xl text-blue-500 mb-4"></i>
                    <p class="text-lg font-medium text-gray-700 mb-2">Dateien hierher ziehen und ablegen</p>
                    <p class="text-gray-500 mb-4">oder</p>
                    <label for="fileInput" class="bg-blue-600 hover:bg-blue-700 text-white font-medium py-2 px-6 rounded-lg transition cursor-pointer">
                        Dateien auswählen
                    </label>
                    <input id="fileInput" type="file" class="hidden" multiple accept=".pdf,.doc,.docx">
                </div>
            </div>
            
            <div id="fileList" class="mb-6 hidden">
                <h4 class="font-medium text-gray-700 mb-3">Ausgewählte Dateien:</h4>
                <ul id="fileListItems" class="space-y-2"></ul>
            </div>
            
            <div class="flex justify-center">
                <button id="analyzeBtn" class="bg-blue-600 hover:bg-blue-700 text-white font-medium py-3 px-8 rounded-lg transition disabled:opacity-50 disabled:cursor-not-allowed" disabled>
                    Analyse starten <i class="fas fa-magic ml-2"></i>
                </button>
            </div>
        </section>

        <!-- Analysis Progress Section -->
        <section id="progressSection" class="bg-white rounded-xl shadow-md p-8 mb-12 max-w-4xl mx-auto hidden">
            <div class="text-center mb-8">
                <h3 class="text-2xl font-bold text-gray-800 mb-2">Analyse läuft</h3>
                <p class="text-gray-600">
                    Unsere KI analysiert die hochgeladenen Prüfungen. Dies kann einige Minuten dauern.
                </p>
            </div>
            
            <div class="mb-6">
                <div class="flex justify-between mb-2">
                    <span class="text-sm font-medium text-gray-700">Fortschritt</span>
                    <span id="progressPercent" class="text-sm font-medium text-gray-700">0%</span>
                </div>
                <div class="w-full bg-gray-200 rounded-full h-2.5">
                    <div id="progressBar" class="progress-bar bg-blue-600 h-2.5 rounded-full" style="width: 0%"></div>
                </div>
            </div>
            
            <div class="grid grid-cols-1 md:grid-cols-3 gap-4 mb-6">
                <div class="bg-blue-50 p-4 rounded-lg">
                    <div class="flex items-center mb-2">
                        <div class="bg-blue-100 p-2 rounded-full mr-3">
                            <i class="fas fa-tags text-blue-600"></i>
                        </div>
                        <span class="font-medium text-gray-700">Themenanalyse</span>
                    </div>
                    <p id="topicStatus" class="text-sm text-gray-600">Wird vorbereitet...</p>
                </div>
                <div class="bg-blue-50 p-4 rounded-lg">
                    <div class="flex items-center mb-2">
                        <div class="bg-blue-100 p-2 rounded-full mr-3">
                            <i class="fas fa-question-circle text-blue-600"></i>
                        </div>
                        <span class="font-medium text-gray-700">Frageformate</span>
                    </div>
                    <p id="formatStatus" class="text-sm text-gray-600">Wird vorbereitet...</p>
                </div>
                <div class="bg-blue-50 p-4 rounded-lg">
                    <div class="flex items-center mb-2">
                        <div class="bg-blue-100 p-2 rounded-full mr-3">
                            <i class="fas fa-chart-line text-blue-600"></i>
                        </div>
                        <span class="font-medium text-gray-700">Schwierigkeitsgrad</span>
                    </div>
                    <p id="difficultyStatus" class="text-sm text-gray-600">Wird vorbereitet...</p>
                </div>
            </div>
            
            <div class="text-center">
                <p class="text-gray-500 text-sm">
                    <i class="fas fa-info-circle mr-1"></i> Die Analyse wird auf unseren Servern durchgeführt. Ihre Dateien werden nach der Verarbeitung automatisch gelöscht.
                </p>
            </div>
        </section>

        <!-- Results Section -->
        <section id="resultsSection" class="hidden">
            <div class="bg-white rounded-xl shadow-md p-8 mb-8">
                <div class="flex flex-col md:flex-row justify-between items-start md:items-center mb-6">
                    <div>
                        <h3 class="text-2xl font-bold text-gray-800 mb-2">Analyseergebnisse</h3>
                        <p class="text-gray-600">Basierend auf <span id="examCount" class="font-medium">3</span> hochgeladenen Prüfungen</p>
                    </div>
                    <button id="generateExamBtn" class="bg-green-600 hover:bg-green-700 text-white font-medium py-2 px-6 rounded-lg transition mt-4 md:mt-0">
                        Übungsprüfung generieren <i class="fas fa-file-alt ml-2"></i>
                    </button>
                </div>
                
                <!-- Topics Cloud -->
                <div class="mb-8">
                    <h4 class="font-bold text-gray-700 mb-4">Häufigste Themengebiete</h4>
                    <div class="topic-cloud mb-4">
                        <span class="topic-item bg-blue-100 text-blue-800 text-lg">Grundlagen (32%)</span>
                        <span class="topic-item bg-blue-200 text-blue-900 text-xl">Algorithmen (28%)</span>
                        <span class="topic-item bg-blue-300 text-blue-900 text-lg">Datenstrukturen (24%)</span>
                        <span class="topic-item bg-blue-100 text-blue-800">Komplexität (12%)</span>
                        <span class="topic-item bg-blue-100 text-blue-800">Rekursion (10%)</span>
                        <span class="topic-item bg-blue-50 text-blue-700 text-sm">Graphen (8%)</span>
                        <span class="topic-item bg-blue-50 text-blue-700 text-sm">Sortierverfahren (6%)</span>
                    </div>
                </div>
                
                <!-- Charts -->
                <div class="grid grid-cols-1 md:grid-cols-2 gap-8 mb-8">
                    <div>
                        <h4 class="font-bold text-gray-700 mb-4">Frageformate Verteilung</h4>
                        <div class="bg-gray-100 rounded-lg p-4 h-64 flex items-center justify-center">
                            <p class="text-gray-500">[Balkendiagramm der Frageformate]</p>
                        </div>
                    </div>
                    <div>
                        <h4 class="font-bold text-gray-700 mb-4">Schwierigkeitsgrad</h4>
                        <div class="bg-gray-100 rounded-lg p-4 h-64 flex items-center justify-center">
                            <p class="text-gray-500">[Kreisdiagramm der Schwierigkeitsgrade]</p>
                        </div>
                    </div>
                </div>
                
                <!-- Detailed Stats -->
                <div>
                    <h4 class="font-bold text-gray-700 mb-4">Detaillierte Statistik</h4>
                    <div class="overflow-x-auto">
                        <table class="min-w-full bg-white rounded-lg overflow-hidden">
                            <thead class="bg-gray-100">
                                <tr>
                                    <th class="py-3 px-4 text-left text-gray-700">Themengebiet</th>
                                    <th class="py-3 px-4 text-left text-gray-700">Häufigkeit</th>
                                    <th class="py-3 px-4 text-left text-gray-700">Durchschn. Punkte</th>
                                    <th class="py-3 px-4 text-left text-gray-700">Frageformate</th>
                                </tr>
                            </thead>
                            <tbody class="divide-y divide-gray-200">
                                <tr>
                                    <td class="py-3 px-4">Algorithmen</td>
                                    <td class="py-3 px-4">28%</td>
                                    <td class="py-3 px-4">12/20</td>
                                    <td class="py-3 px-4">Offen (60%), MC (30%), Berechnung (10%)</td>
                                </tr>
                                <tr>
                                    <td class="py-3 px-4">Datenstrukturen</td>
                                    <td class="py-3 px-4">24%</td>
                                    <td class="py-3 px-4">15/20</td>
                                    <td class="py-3 px-4">MC (50%), Offen (40%), Diagramm (10%)</td>
                                </tr>
                                <tr>
                                    <td class="py-3 px-4">Grundlagen</td>
                                    <td class="py-3 px-4">32%</td>
                                    <td class="py-3 px-4">18/20</td>
                                    <td class="py-3 px-4">MC (70%), Offen (30%)</td>
                                </tr>
                            </tbody>
                        </table>
                    </div>
                </div>
            </div>
        </section>

        <!-- Generated Exam Section -->
        <section id="generatedExamSection" class="hidden">
            <div class="bg-white rounded-xl shadow-md p-8 mb-8">
                <div class="flex flex-col md:flex-row justify-between items-start md:items-center mb-6">
                    <div>
                        <h3 class="text-2xl font-bold text-gray-800 mb-2">Generierte Übungsprüfung</h3>
                        <p class="text-gray-600">Basierend auf den Analyseergebnissen</p>
                    </div>
                    <div class="flex space-x-3 mt-4 md:mt-0">
                        <button class="border border-blue-600 text-blue-600 hover:bg-blue-50 font-medium py-2 px-4 rounded-lg transition">
                            <i class="fas fa-download mr-2"></i> PDF
                        </button>
                        <button class="border border-green-600 text-green-600 hover:bg-green-50 font-medium py-2 px-4 rounded-lg transition">
                            <i class="fas fa-edit mr-2"></i> Anpassen
                        </button>
                    </div>
                </div>
                
                <div class="mb-6 p-4 bg-blue-50 rounded-lg">
                    <div class="flex items-start">
                        <div class="bg-blue-100 p-2 rounded-full mr-3 mt-1">
                            <i class="fas fa-info-circle text-blue-600"></i>
                        </div>
                        <div>
                            <p class="text-sm text-gray-700">
                                Diese Prüfung wurde von unserer KI erstellt und deckt die wichtigsten Themen ab. Sie enthält eine Mischung aus verschiedenen Fragetypen mit einem vergleichbaren Schwierigkeitsgrad wie die Originalprüfungen.
                            </p>
                        </div>
                    </div>
                </div>
                
                <!-- Exam Content -->
                <div class="space-y-6">
                    <!-- Question 1 -->
                    <div class="question-card bg-gray-50 rounded-lg p-6">
                        <div class="flex justify-between items-start mb-3">
                            <h4 class="font-bold text-gray-800">Frage 1: Algorithmen (12 Punkte)</h4>
                            <span class="bg-blue-100 text-blue-800 text-xs font-medium px-2.5 py-0.5 rounded">Offene Frage</span>
                        </div>
                        <p class="text-gray-700 mb-4">
                            Erläutern Sie den Unterschied zwischen Greedy-Algorithmen und dynamischer Programmierung. Nennen Sie jeweils ein Beispiel und beschreiben Sie, wann welche Methode bevorzugt wird.
                        </p>
                        <button class="toggle-solution text-blue-600 hover:text-blue-800 text-sm font-medium flex items-center">
                            <i class="fas fa-chevron-down mr-1"></i> Lösung anzeigen
                        </button>
                        <div class="solution mt-3 bg-white p-4 rounded-lg border border-gray-200">
                            <p class="text-gray-700 mb-2"><strong>Greedy-Algorithmen:</strong> Lösen Probleme in Schritten, wobei jeder Schritt die lokal optimale Wahl trifft (z.B. Kruskals Algorithmus für minimale Spannbäume).</p>
                            <p class="text-gray-700 mb-2"><strong>Dynamische Programmierung:</strong> Löst Teilprobleme und speichert Ergebnisse für spätere Verwendung (z.B. Fibonacci-Zahlen).</p>
                            <p class="text-gray-700">Greedy ist einfacher aber nicht immer optimal. DP ist rechenintensiver aber garantiert optimale Lösungen.</p>
                        </div>
                    </div>
                    
                    <!-- Question 2 -->
                    <div class="question-card bg-gray-50 rounded-lg p-6">
                        <div class="flex justify-between items-start mb-3">
                            <h4 class="font-bold text-gray-800">Frage 2: Datenstrukturen (8 Punkte)</h4>
                            <span class="bg-green-100 text-green-800 text-xs font-medium px-2.5 py-0.5 rounded">Multiple Choice</span>
                        </div>
                        <p class="text-gray-700 mb-3">
                            Welche der folgenden Aussagen über Hash-Tabellen sind korrekt? (Mehrere Antworten möglich)
                        </p>
                        <div class="space-y-2 mb-4">
                            <div class="flex items-center">
                                <input type="checkbox" class="w-4 h-4 text-blue-600 bg-gray-100 border-gray-300 rounded focus:ring-blue-500">
                                <label class="ml-2 text-gray-700">Die durchschnittliche Zeitkomplexität für Suche ist O(1)</label>
                            </div>
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                                <label class="ml-2 text-gray-700">Die Load-Factor sollte immer unter 0.5 bleiben</label>
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                            <p class="text-gray-700">Korrekte Antworten: 1, 2, 4. Die Load-Factor kann je nach Implementierung höher sein, typischerweise wird bei 0.7-0.8 neu gehasht.</p>
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                            <h4 class="font-bold text-gray-800">Frage 3: Komplexität (10 Punkte)</h4>
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                            Gegeben ist folgender Algorithmus. Bestimmen Sie die Zeitkomplexität in O-Notation und begründen Sie Ihre Antwort:
                            <pre class="bg-gray-800 text-gray-100 p-3 rounded mt-2 overflow-x-auto">
function example(n) {
    let sum = 0;
    for (let i = 0; i < n; i++) {
        for (let j = 0; j < i; j++) {
            sum += i * j;
        }
    }
    return sum;
}</pre>
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                            <p class="text-gray-700">Die Zeitkomplexität ist O(n²). Die äußere Schleife läuft n-mal. Die innere Schleife läuft im ersten Durchgang 0-mal, dann 1-mal, dann 2-mal usw. bis n-1-mal. Die Gesamtanzahl der Operationen ist daher 0 + 1 + 2 + ... + (n-1) = n(n-1)/2 ∈ O(n²).</p>
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