diff --git a/.idea/php.xml b/.idea/php.xml
index f324872..a85fe78 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -10,6 +10,7 @@
     <option name="highlightLevel" value="WARNING" />
     <option name="transferred" value="true" />
   </component>
+  <component name="PhpProjectSharedConfiguration" php_language_level="8.0" />
   <component name="PhpStanOptionsConfiguration">
     <option name="transferred" value="true" />
   </component>
diff --git a/webseite/classes/SubjectData.php b/webseite/classes/SubjectData.php
new file mode 100644
index 0000000..6a1fbd4
--- /dev/null
+++ b/webseite/classes/SubjectData.php
@@ -0,0 +1,83 @@
+<?php
+require_once("Util.php");
+require_once("TopicData.php");
+
+class SubjectData
+{
+    public string $id;
+    public string $displayName;
+    public string $description;
+    public string $color;
+    public string $buttonText;
+    public string $icon;
+    public array $topics;
+
+    public static function getAll() : array
+    {
+        $result = array();
+
+        $subjectDirectory = "config/subjects";
+        $subjectNames = scandir($subjectDirectory);
+        foreach ($subjectNames as $subjectName) {
+            if ($subjectName == "." || $subjectName == "..") {
+                continue;
+            }
+
+            $subjectData = SubjectData::fromName($subjectName);
+            if(!isset($subjectData)) {
+                continue;
+            }
+
+            $result[] = $subjectData;
+        }
+
+        return $result;
+    }
+
+    public static function fromName($subjectName) : SubjectData|null
+    {
+        $result = new SubjectData();
+
+        $subjectName = Util::removeIllegalCharacters($subjectName);
+
+        $subjectDirectory = "config/subjects/$subjectName";
+        $filename = "$subjectDirectory/properties.json";
+        $data = Util::parseJsonFromFile($filename);
+
+        $result->id = $subjectName;
+
+        if(isset($data->displayName)) {
+            $result->displayName = $data->displayName;
+        } else {
+            return null;
+        }
+
+        if(isset($data->description)) {
+            $result->description = $data->description;
+        } else {
+            return null;
+        }
+
+        if(isset($data->color)) {
+            $result->color = $data->color;
+        } else {
+            return null;
+        }
+
+        if(isset($data->buttonText)) {
+            $result->buttonText = $data->buttonText;
+        } else {
+            return null;
+        }
+
+        if(isset($data->icon)) {
+            $result->icon = $data->icon;
+        } else {
+            return null;
+        }
+
+        $result->topics = TopicData::getAll($subjectName);
+
+        return $result;
+    }
+}
\ No newline at end of file
diff --git a/webseite/classes/TopicData.php b/webseite/classes/TopicData.php
new file mode 100644
index 0000000..ef5f129
--- /dev/null
+++ b/webseite/classes/TopicData.php
@@ -0,0 +1,88 @@
+<?php
+require_once("Util.php");
+
+class TopicData
+{
+    public string $id;
+    public string $subjectId;
+    public string $displayName;
+    public string $icon;
+    public string $description;
+    public array $relatedTopics;
+    public array $files;
+    public string $article;
+
+    public static function getAll($subjectName) : array
+    {
+        $result = array();
+
+        $topicDirectory = "config/subjects/$subjectName/topics";
+        $topicNames = scandir($topicDirectory);
+        foreach ($topicNames as $topicName) {
+            if ($topicName == "." || $topicName == "..") {
+                continue;
+            }
+            $topicData = TopicData::fromName($subjectName, $topicName);
+            if(!isset($topicData)) {
+                continue;
+            }
+
+            $result[] = $topicData;
+        }
+
+        return $result;
+    }
+
+    public static function fromName($subjectName, $topicName): TopicData|null
+    {
+        $result = new TopicData();
+
+        $subjectName = Util::removeIllegalCharacters($subjectName);
+        $topicName = Util::removeIllegalCharacters($topicName);
+
+        $topicDirectory = "config/subjects/$subjectName/topics";
+        $filename = "$topicDirectory/$topicName/properties.json";
+        $data = Util::parseJsonFromFile($filename);
+
+        $result->id = $topicName;
+        $result->subjectId = $subjectName;
+
+        if(isset($data->displayName)) {
+            $result->displayName = $data->displayName;
+        } else {
+            return null;
+        }
+
+        if(isset($data->icon)) {
+            $result->icon = $data->icon;
+        } else {
+            return null;
+        }
+
+        if(isset($data->description)) {
+            $result->description = $data->description;
+        } else {
+            return null;
+        }
+
+        if(isset($data->relatedTopics)) {
+            $result->relatedTopics = $data->relatedTopics;
+        } else {
+            $result->relatedTopics = array();
+        }
+        if(isset($data->files)) {
+            $result->files = $data->files;
+        } else {
+            $result->files = array();
+        }
+
+        if(isset($data->article)) {
+            $result->article = $data->article;
+        } else {
+            return null;
+        }
+
+        return $result;
+    }
+
+}
\ No newline at end of file
diff --git a/webseite/classes/Util.php b/webseite/classes/Util.php
new file mode 100644
index 0000000..1e1cbed
--- /dev/null
+++ b/webseite/classes/Util.php
@@ -0,0 +1,18 @@
+<?php
+
+class Util
+{
+    static function removeIllegalCharacters($string): string
+    {
+        return preg_replace("/[^a-zA-Z0-9_-]/", "", $string);
+    }
+
+    static function parseJsonFromFile($filename): mixed
+    {
+        $file = fopen($filename, "r") or die("Unable to open file!");
+        $fileContent = fread($file, filesize($filename));
+        fclose($file);
+
+        return json_decode($fileContent);
+    }
+}
\ No newline at end of file
diff --git a/webseite/config/subjects/deutsch/properties.json b/webseite/config/subjects/deutsch/properties.json
new file mode 100644
index 0000000..98b5b63
--- /dev/null
+++ b/webseite/config/subjects/deutsch/properties.json
@@ -0,0 +1,7 @@
+{
+  "displayName": "Deutsch",
+  "description": "Deutsch ist blau",
+  "color": "#FF0000",
+  "buttonText": "Erfahre von einem ungeheuren Ungeziefer",
+  "icon": "fa-book"
+}
\ No newline at end of file
diff --git a/webseite/config/subjects/deutsch/topics/topic1/exercise1.pdf b/webseite/config/subjects/deutsch/topics/topic1/exercise1.pdf
new file mode 100644
index 0000000..10b056f
Binary files /dev/null and b/webseite/config/subjects/deutsch/topics/topic1/exercise1.pdf differ
diff --git a/webseite/config/subjects/deutsch/topics/topic1/image.png b/webseite/config/subjects/deutsch/topics/topic1/image.png
new file mode 100644
index 0000000..a111ca4
Binary files /dev/null and b/webseite/config/subjects/deutsch/topics/topic1/image.png differ
diff --git a/webseite/config/subjects/deutsch/topics/topic1/properties.json b/webseite/config/subjects/deutsch/topics/topic1/properties.json
new file mode 100644
index 0000000..4b30111
--- /dev/null
+++ b/webseite/config/subjects/deutsch/topics/topic1/properties.json
@@ -0,0 +1,12 @@
+{
+  "displayName": "Thema 1",
+  "icon": "fa-divide",
+  "description": "Eine kurze Beschreibung des Themas",
+  "relatedTopics": [
+    "topic2", "topic3"
+  ],
+  "files": [
+    "exercise1.pdf"
+  ],
+  "article": "Eine lange Erklärung\n![Alt Text](image.png)"
+}
\ No newline at end of file
diff --git a/webseite/config/subjects/mathe/properties.json b/webseite/config/subjects/mathe/properties.json
new file mode 100644
index 0000000..f755597
--- /dev/null
+++ b/webseite/config/subjects/mathe/properties.json
@@ -0,0 +1,7 @@
+{
+  "displayName": "Mathe",
+  "description": "Mathe ist gelb",
+  "color": "#60A5FA",
+  "buttonText": "Jetzt rechnen!",
+  "icon": "fa-square-root-alt"
+}
\ No newline at end of file
diff --git a/webseite/config/subjects/mathe/topics/topic1/exercise1.pdf b/webseite/config/subjects/mathe/topics/topic1/exercise1.pdf
new file mode 100644
index 0000000..10b056f
Binary files /dev/null and b/webseite/config/subjects/mathe/topics/topic1/exercise1.pdf differ
diff --git a/webseite/config/subjects/mathe/topics/topic1/image.png b/webseite/config/subjects/mathe/topics/topic1/image.png
new file mode 100644
index 0000000..a111ca4
Binary files /dev/null and b/webseite/config/subjects/mathe/topics/topic1/image.png differ
diff --git a/webseite/config/subjects/mathe/topics/topic1/properties.json b/webseite/config/subjects/mathe/topics/topic1/properties.json
new file mode 100644
index 0000000..4b30111
--- /dev/null
+++ b/webseite/config/subjects/mathe/topics/topic1/properties.json
@@ -0,0 +1,12 @@
+{
+  "displayName": "Thema 1",
+  "icon": "fa-divide",
+  "description": "Eine kurze Beschreibung des Themas",
+  "relatedTopics": [
+    "topic2", "topic3"
+  ],
+  "files": [
+    "exercise1.pdf"
+  ],
+  "article": "Eine lange Erklärung\n![Alt Text](image.png)"
+}
\ No newline at end of file
diff --git a/webseite/config/subjects/mathe/topics/topic2/properties.json b/webseite/config/subjects/mathe/topics/topic2/properties.json
new file mode 100644
index 0000000..f508507
--- /dev/null
+++ b/webseite/config/subjects/mathe/topics/topic2/properties.json
@@ -0,0 +1,11 @@
+{
+  "displayName": "Thema 2",
+  "icon": "fa-ruler",
+  "description": "Kurze Beschreibung",
+  "relatedTopics": [
+    "topic3"
+  ],
+  "files": [
+  ],
+  "article": "Erklärung"
+}
\ No newline at end of file
diff --git a/webseite/homepage.php b/webseite/homepage.php
new file mode 100644
index 0000000..9fb93ce
--- /dev/null
+++ b/webseite/homepage.php
@@ -0,0 +1,243 @@
+<!DOCTYPE html>
+<!--Homepage-->
+<html lang="de">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Modernes Lernportal</title>
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
+    <script src="https://cdn.tailwindcss.com"></script>
+    <style>
+        @keyframes float {
+            0%, 100% { transform: translateY(0px); }
+            50% { transform: translateY(-20px); }
+        }
+        
+        .card-hover {
+            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+        }
+        
+        .card-hover:hover {
+            transform: translateY(-10px) scale(1.02);
+            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
+                        0 10px 10px -5px rgba(0, 0, 0, 0.04);
+        }
+
+        .gradient-border {
+            position: relative;
+            background: linear-gradient(white, white) padding-box,
+                       linear-gradient(45deg, #7C3AED, #F59E0B) border-box;
+            border: 4px solid transparent;
+            border-radius: 1rem;
+        }
+
+        .blob {
+            animation: blob 7s infinite;
+            filter: blur(40px);
+        }
+
+        @keyframes blob {
+            0%, 100% { border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%; }
+            33% { border-radius: 72% 28% 30% 70% / 53% 51% 49% 47%; }
+            66% { border-radius: 38% 62% 63% 37% / 46% 48% 52% 54%; }
+        }
+
+        .pulse {
+            animation: pulse 2s infinite;
+        }
+
+        @keyframes pulse {
+            0% { transform: scale(1); }
+            50% { transform: scale(1.05); }
+            100% { transform: scale(1); }
+        }
+
+        /* Improved icon hover effect */
+        .w-12 {
+            transition: all 0.3s ease;
+        }
+
+        .card-hover:hover .w-12 {
+            transform: scale(1.1) rotate(-5deg);
+        }
+
+        /* Improved button hover effect */
+        .hover\:bg-purple-700:hover {
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
+        }
+
+        /* Scroll to top button */
+        .scroll-top {
+            position: fixed;
+            bottom: 2rem;
+            right: 6rem; /* Move scroll-top button to the left of accessibility button */
+            background: linear-gradient(135deg, #7C3AED, #F59E0B);
+            color: white;
+            padding: 1rem;
+            border-radius: 50%;
+            cursor: pointer;
+            opacity: 0;
+            transition: all 0.3s ease;
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+        }
+
+        .scroll-top.visible {
+            opacity: 1;
+        }
+
+        .scroll-top:hover {
+            transform: translateY(-3px);
+            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
+        }
+    </style>
+</head>
+<body class="bg-gray-50">
+<!-- Animated background blobs -->
+    <div class="fixed inset-0 -z-10 overflow-hidden">
+        <div class="blob absolute w-96 h-96 bg-purple-300/30 -top-48 -left-16"></div>
+        <div class="blob absolute w-96 h-96 bg-amber-300/30 bottom-0 right-0"></div>
+    </div>
+
+    <!-- Navigation -->
+    <nav class="fixed top-0 w-full bg-white/80 backdrop-blur-lg shadow-sm z-50">
+        <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+            <div class="flex justify-between h-16">
+                <div class="flex items-center">
+                    <span class="text-2xl font-bold text-purple-600">Lern<span class="text-amber-500">Portal</span></span>
+                </div>
+                <!-- Add this accessibility controls -->
+
+            </div>
+        </div>
+    </nav>
+
+    <!-- Hero Section -->
+    <div class="pt-24 pb-16 px-4">
+        <div class="max-w-7xl mx-auto">
+            <div class="text-center">
+                <h1 class="text-5xl md:text-6xl font-bold text-gray-900 mb-6 pulse">
+                    Entdecke deine <span class="text-purple-600">Lernreise</span>
+                </h1>
+                <p class="text-xl text-gray-600 max-w-2xl mx-auto">
+                    Interaktives Lernen für die digitale Generation. Personalisierte Lernpfade, sofortiges Feedback und spielerische Elemente.
+                </p>
+            </div>
+        </div>
+    </div>
+
+    <!-- Subject Grid -->
+    <div class="max-w-7xl mx-auto px-4 py-12 grid grid-cols-1 md:grid-cols-2 gap-8">
+        <!-- Mathematik -->
+        <?php
+            require_once ("classes/SubjectData.php");
+            $subjects = SubjectData::getAll();
+
+            foreach ($subjects as $subject) {
+                ?>
+                    <a href="subject.php?subject=<?php echo($subject->id); ?>" class="block">
+                        <div class="gradient-border p-6 card-hover bg-white">
+                            <div class="flex items-start space-x-4">
+                                <div class="w-12 h-12 rounded-lg bg-purple-100 flex items-center justify-center">
+                                    <i class="fas <?php echo($subject->icon); ?> text-2xl text-purple-600"></i>
+                                </div>
+                                <div class="flex-1">
+                                    <h3 class="text-xl font-bold text-gray-900 mb-2"><?php echo($subject->displayName); ?></h3>
+                                    <p class="text-gray-600 mb-4"><?php echo($subject->description); ?></p>
+                                    <div class="grid grid-cols-3 gap-4 mb-4">
+                                        <div class="text-center p-2 rounded-lg bg-purple-50">
+                                            <div class="font-bold text-purple-600">150+</div>
+                                            <div class="text-sm text-gray-600">Übungen</div>
+                                        </div>
+                                        <div class="text-center p-2 rounded-lg bg-purple-50">
+                                            <div class="font-bold text-purple-600">12</div>
+                                            <div class="text-sm text-gray-600">Kapitel</div>
+                                        </div>
+                                        <div class="text-center p-2 rounded-lg bg-purple-50">
+                                            <div class="font-bold text-purple-600">4.8</div>
+                                            <div class="text-sm text-gray-600">Bewertung</div>
+                                        </div>
+                                    </div>
+                                    <div class="flex items-center space-x-2">
+                                        <span class="text-sm text-gray-500">Aktuelle Einheit:</span>
+                                        <span class="px-2 py-1 rounded-full bg-purple-100 text-purple-600 text-sm">Bruchrechnung</span>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+                    </a>
+
+                <?php
+            }
+        ?>
+
+    </div>
+
+    <button class="scroll-top" onclick="scrollToTop()" id="scrollTop">
+        <i class="fas fa-arrow-up"></i>
+    </button>
+
+    <script>
+        // Initialize GSAP animations
+        gsap.from(".gradient-border", {
+            duration: 0.8,
+            y: 60,
+            opacity: 0,
+            stagger: 0.2,
+            ease: "power3.out"
+        });
+
+        // Add intersection observer for scroll animations
+        const observer = new IntersectionObserver((entries) => {
+            entries.forEach(entry => {
+                if (entry.isIntersecting) {
+                    entry.target.style.transform = "translateY(0)";
+                    entry.target.style.opacity = "1";
+                }
+            });
+        }, { threshold: 0.1 });
+
+        document.querySelectorAll('.gradient-border').forEach((el) => {
+            observer.observe(el);
+        });
+
+        // Scroll to top functionality
+        window.onscroll = function() {
+            const scrollBtn = document.getElementById('scrollTop');
+            if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
+                scrollBtn.classList.add('visible');
+            } else {
+                scrollBtn.classList.remove('visible');
+            }
+        };
+
+        function scrollToTop() {
+            window.scrollTo({
+                top: 0,
+                behavior: 'smooth'
+            });
+        }
+
+        // Add hover effects for subject cards
+        document.querySelectorAll('.gradient-border').forEach(card => {
+            card.addEventListener('mouseenter', () => {
+                gsap.to(card.querySelector('.w-12'), {
+                    rotate: -10,
+                    scale: 1.2,
+                    duration: 0.3
+                });
+            });
+
+            card.addEventListener('mouseleave', () => {
+                gsap.to(card.querySelector('.w-12'), {
+                    rotate: 0,
+                    scale: 1,
+                    duration: 0.3
+                });
+            });
+        });
+    </script>
+</body>
+</html>
diff --git a/webseite/index.html b/webseite/index.html
deleted file mode 100644
index d945178..0000000
--- a/webseite/index.html
+++ /dev/null
@@ -1,171 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Lernportal</title>
-    <style>
-        * {
-            margin: 0;
-            padding: 0;
-            box-sizing: border-box;
-            font-family: system-ui, -apple-system, sans-serif;
-        }
-
-        body {
-            min-height: 100vh;
-            background: linear-gradient(135deg, #f6f8ff 0%, #f1f5ff 100%);
-            display: flex;
-            flex-direction: column;
-            align-items: center;
-            padding: 2rem;
-        }
-
-        h1 {
-            color: #2d3748;
-            font-size: 2.5rem;
-            margin-bottom: 2rem;
-            text-align: center;
-            animation: bounce 1s ease;
-        }
-
-        .container {
-            display: grid;
-            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
-            gap: 2rem;
-            max-width: 1200px;
-            width: 100%;
-        }
-
-        .subject-card {
-            background: white;
-            border-radius: 24px;
-            padding: 2rem;
-            text-align: center;
-            transition: transform 0.3s ease, box-shadow 0.3s ease;
-            cursor: pointer;
-            position: relative;
-            overflow: hidden;
-            min-height: 280px;
-            display: flex;
-            flex-direction: column;
-            align-items: center;
-            justify-content: center;
-            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
-        }
-
-        .subject-card:hover {
-            transform: translateY(-5px);
-            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
-        }
-
-        .subject-card::before {
-            content: '';
-            position: absolute;
-            top: 0;
-            left: 0;
-            right: 0;
-            height: 8px;
-            background: var(--accent-color);
-        }
-
-        .mathematik {
-            --accent-color: #60A5FA;
-        }
-
-        .englisch {
-            --accent-color: #34D399;
-        }
-
-        .deutsch {
-            --accent-color: #F472B6;
-        }
-
-        .physik {
-            --accent-color: #A78BFA;
-        }
-
-        .icon {
-            font-size: 3.5rem;
-            margin-bottom: 1rem;
-            color: var(--accent-color);
-        }
-
-        .subject-name {
-            font-size: 1.5rem;
-            font-weight: 600;
-            color: #2d3748;
-            margin-bottom: 0.5rem;
-        }
-
-        .description {
-            font-size: 1rem;
-            color: #64748b;
-            margin-bottom: 1rem;
-        }
-
-        .start-button {
-            background: var(--accent-color);
-            color: white;
-            border: none;
-            padding: 0.75rem 1.5rem;
-            border-radius: 12px;
-            font-weight: 600;
-            transition: opacity 0.2s ease;
-            text-decoration: none;
-        }
-
-        .start-button:hover {
-            opacity: 0.9;
-        }
-
-        @keyframes bounce {
-            0% { transform: translateY(-20px); opacity: 0; }
-            100% { transform: translateY(0); opacity: 1; }
-        }
-
-        @media (max-width: 768px) {
-            .container {
-                grid-template-columns: 1fr;
-                padding: 1rem;
-            }
-
-            h1 {
-                font-size: 2rem;
-            }
-        }
-    </style>
-</head>
-<body>
-<h1>Wähle dein Lieblingsfach! 🚀</h1>
-<div class="container">
-    <div class="subject-card mathematik">
-        <div class="icon">🔢</div>
-        <h2 class="subject-name">Mathematik</h2>
-        <p class="description">Löse spannende Aufgaben und werde zum Mathe-Champion!</p>
-        <a href="./mathe/mathe.html" class="start-button">Jetzt rechnen!</a>
-    </div>
-
-    <div class="subject-card englisch">
-        <div class="icon">📚</div>
-        <h2 class="subject-name">Englisch</h2>
-        <p class="description">Entdecke neue Wörter und verbessere dein Englisch!</p>
-        <a href="#englisch" class="start-button">Los geht's!</a>
-    </div>
-
-    <div class="subject-card deutsch">
-        <div class="icon">✍️</div>
-        <h2 class="subject-name">Deutsch</h2>
-        <p class="description">Erkunde Geschichten und verbessere deine Sprache!</p>
-        <a href="#deutsch" class="start-button">Start!</a>
-    </div>
-
-    <div class="subject-card physik">
-        <div class="icon">⚡</div>
-        <h2 class="subject-name">Physik</h2>
-        <p class="description">Entdecke die spannende Welt der Naturwissenschaften!</p>
-        <a href="#physik" class="start-button">Experimentieren!</a>
-    </div>
-</div>
-</body>
-</html>
\ No newline at end of file
diff --git a/webseite/mathe/mathe.html b/webseite/mathe/mathe.html
deleted file mode 100644
index 7472588..0000000
--- a/webseite/mathe/mathe.html
+++ /dev/null
@@ -1,328 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Mathematik 5. Klasse</title>
-    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
-    <style>
-        * {
-            margin: 0;
-            padding: 0;
-            box-sizing: border-box;
-        }
-
-        body {
-            background-color: #f5f5f5;
-            min-height: 100vh;
-            display: flex;
-            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
-        }
-
-        /* Sidebar Styles */
-        .sidebar {
-            width: 250px;
-            height: 100vh;
-            background: white;
-            padding: 20px;
-            position: fixed;
-            left: 0;
-            top: 0;
-            box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
-            transition: all 0.3s ease;
-            z-index: 1000;
-        }
-
-        .search-container {
-            position: fixed;
-            top: 0;
-            left: 250px;
-            right: 0;
-            padding: 20px;
-            background: white;
-            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
-            transition: all 0.3s ease;
-            z-index: 100;
-        }
-
-        .search-box {
-            width: 100%;
-            padding: 12px 20px;
-            border: 2px solid #ddd;
-            border-radius: 25px;
-            outline: none;
-            font-size: 16px;
-        }
-
-        .nav-link {
-            display: flex;
-            align-items: center;
-            padding: 15px;
-            color: #333;
-            text-decoration: none;
-            border-radius: 10px;
-            margin-bottom: 10px;
-            transition: all 0.3s ease;
-        }
-
-        .nav-link:hover {
-            background-color: #f0f0f0;
-            transform: translateX(5px);
-        }
-
-        .nav-link i {
-            margin-right: 15px;
-        }
-
-        /* Main Content Styles */
-        .main-content {
-            margin-left: 250px;
-            width: calc(100% - 250px);
-            padding-top: 80px;
-        }
-
-        .container {
-            display: grid;
-            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
-            gap: 20px;
-            padding: 20px;
-            max-width: 1600px;
-            margin: 0 auto;
-        }
-
-        .topic-card {
-            background: white;
-            border-radius: 15px;
-            padding: 20px;
-            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
-            transition: all 0.3s ease;
-            display: flex;
-            flex-direction: column;
-            align-items: center;
-            text-align: center;
-        }
-
-        .topic-card:hover {
-            transform: translateY(-5px);
-            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
-        }
-
-        .topic-icon {
-            font-size: 2.5rem;
-            margin-bottom: 15px;
-            color: #4a90e2;
-        }
-
-        .topic-title {
-            font-size: 1.25rem;
-            font-weight: 600;
-            margin-bottom: 10px;
-            color: #333;
-        }
-
-        .topic-description {
-            font-size: 0.9rem;
-            color: #666;
-            line-height: 1.4;
-        }
-
-        .progress-bar {
-            width: 100%;
-            height: 8px;
-            background: #eee;
-            border-radius: 4px;
-            margin-top: 15px;
-            overflow: hidden;
-        }
-
-        .progress {
-            height: 100%;
-            background: #4a90e2;
-            border-radius: 4px;
-            width: 0%;
-            transition: width 0.3s ease;
-        }
-
-        /* Responsive Design */
-        @media (max-width: 900px) {
-            .sidebar {
-                transform: translateX(-250px);
-            }
-            
-            .sidebar.active {
-                transform: translateX(0);
-            }
-
-            .main-content {
-                margin-left: 0;
-                width: 100%;
-            }
-
-            .search-container {
-                left: 0;
-            }
-
-            .menu-toggle {
-                display: block;
-            }
-        }
-
-        .menu-toggle {
-            display: none;
-            position: fixed;
-            top: 20px;
-            left: 20px;
-            z-index: 1001;
-            background: white;
-            border: none;
-            padding: 12px;
-            border-radius: 8px;
-            cursor: pointer;
-            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
-        }
-    </style>
-</head>
-<body>
-    <button class="menu-toggle">
-        <i class="fas fa-bars"></i>
-    </button>
-
-    <nav class="sidebar">
-        <h2 style="margin-bottom: 20px;">Navigation</h2>
-        <a href="#" class="nav-link">
-            <i class="fas fa-home"></i> Startseite
-        </a>
-        <a href="#" class="nav-link">
-            <i class="fas fa-book"></i> Aufgaben
-        </a>
-        <a href="#" class="nav-link">
-            <i class="fas fa-chart-line"></i> Fortschritt
-        </a>
-        <a href="#" class="nav-link">
-            <i class="fas fa-question-circle"></i> Hilfe
-        </a>
-    </nav>
-
-    <div class="search-container">
-        <input type="text" class="search-box" placeholder="Themen durchsuchen...">
-    </div>
-
-    <div class="main-content">
-        <div class="container">
-            <div class="topic-card">
-                <i class="fas fa-calculator topic-icon"></i>
-                <h3 class="topic-title">Grundrechenarten</h3>
-                <p class="topic-description">Addition, Subtraktion, Multiplikation und Division mit natürlichen Zahlen</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 75%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-divide topic-icon"></i>
-                <h3 class="topic-title">Bruchrechnung</h3>
-                <p class="topic-description">Einführung in Brüche, Erweitern und Kürzen von Brüchen</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 45%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-ruler topic-icon"></i>
-                <h3 class="topic-title">Geometrie</h3>
-                <p class="topic-description">Grundformen, Flächen und Umfang von geometrischen Figuren</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 60%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-percentage topic-icon"></i>
-                <h3 class="topic-title">Dezimalzahlen</h3>
-                <p class="topic-description">Rechnen mit Dezimalzahlen und Stellenwertsystem</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 30%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-arrows-alt-h topic-icon"></i>
-                <h3 class="topic-title">Längenmaße</h3>
-                <p class="topic-description">Umrechnen von Längeneinheiten und praktische Anwendungen</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 55%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-balance-scale topic-icon"></i>
-                <h3 class="topic-title">Gewichte</h3>
-                <p class="topic-description">Gewichtseinheiten und deren Umrechnung</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 40%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-clock topic-icon"></i>
-                <h3 class="topic-title">Zeitrechnung</h3>
-                <p class="topic-description">Umgang mit Zeiteinheiten und Zeitspannen</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 85%"></div>
-                </div>
-            </div>
-
-            <div class="topic-card">
-                <i class="fas fa-square-root-alt topic-icon"></i>
-                <h3 class="topic-title">Terme und Gleichungen</h3>
-                <p class="topic-description">Erste Schritte mit mathematischen Ausdrücken</p>
-                <div class="progress-bar">
-                    <div class="progress" style="width: 25%"></div>
-                </div>
-            </div>
-        </div>
-    </div>
-
-    <script>
-        const sidebar = document.querySelector('.sidebar');
-        const menuToggle = document.querySelector('.menu-toggle');
-        const searchContainer = document.querySelector('.search-container');
-        let lastScroll = 0;
-
-        window.addEventListener('scroll', () => {
-            const currentScroll = window.pageYOffset;
-            
-            if (currentScroll > lastScroll && currentScroll > 50) {
-                searchContainer.style.transform = 'translateY(-100%)';
-            } else {
-                searchContainer.style.transform = 'translateY(0)';
-            }
-            lastScroll = currentScroll;
-        });
-
-        menuToggle.addEventListener('click', () => {
-            sidebar.classList.toggle('active');
-        });
-
-        document.addEventListener('click', (e) => {
-            if (window.innerWidth <= 900) {
-                if (!sidebar.contains(e.target) && !menuToggle.contains(e.target)) {
-                    sidebar.classList.remove('active');
-                }
-            }
-        });
-
-        // Animation for progress bars
-        document.querySelectorAll('.topic-card').forEach(card => {
-            card.addEventListener('mouseenter', () => {
-                const progress = card.querySelector('.progress');
-                const width = progress.style.width;
-                progress.style.width = '0%';
-                setTimeout(() => {
-                    progress.style.width = width;
-                }, 50);
-            });
-        });
-    </script>
-</body>
-</html>
\ No newline at end of file
diff --git a/webseite/subject.php b/webseite/subject.php
new file mode 100644
index 0000000..c3bdf71
--- /dev/null
+++ b/webseite/subject.php
@@ -0,0 +1,765 @@
+<!DOCTYPE html>
+
+<?php
+require_once ("classes/SubjectData.php");
+require_once ("classes/TopicData.php");
+
+$subjectData = SubjectData::fromName($_GET["subject"]);
+$topics = $subjectData->topics;
+?>
+
+<html lang="de">
+<!--topics-->
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title><?php echo($subjectData->displayName); ?> 5. Klasse - Modern</title>
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+        }
+
+        :root {
+            --primary: #7C3AED;
+            --primary-light: #9F67FF;
+            --primary-dark: #6D28D9;
+            --bg-color: #F4F7FE;
+            --card-bg: #ffffff;
+            --text-primary: #1E293B;
+            --text-secondary: #64748B;
+            --accent: #F59E0B;
+        }
+
+        /* Add this right after the existing :root {...} block in the style section */
+        :root[data-theme="dark"] {
+            --primary: #9F67FF;
+            --primary-light: #B794F4;
+            --primary-dark: #7C3AED;
+            --bg-color: #1A1A2E;
+            --card-bg: #1E293B;
+            --text-primary: #E2E8F0;
+            --text-secondary: #A0AEC0;
+            --accent: #F59E0B;
+        }
+
+        body {
+            background-color: var(--bg-color);
+            min-height: 100vh;
+            display: flex;
+            overflow-x: hidden;
+        }
+
+        .sidebar {
+            width: 280px;
+            height: 100vh;
+            background: var(--primary);
+            padding: 2rem;
+            position: fixed;
+            left: 0;
+            top: 0;
+            transition: transform 0.3s ease;
+            z-index: 50;
+        }
+
+        .sidebar-header {
+            color: white;
+            margin-bottom: 2rem;
+            display: flex;
+            align-items: center;
+            gap: 1rem;
+        }
+
+        .sidebar-header i {
+            font-size: 2rem;
+        }
+
+        .nav-link {
+            display: flex;
+            align-items: center;
+            padding: 1rem;
+            color: rgba(255, 255, 255, 0.8);
+            text-decoration: none;
+            border-radius: 12px;
+            margin-bottom: 0.5rem;
+            transition: all 0.2s ease;
+        }
+
+        .nav-link:hover {
+            background: rgba(255, 255, 255, 0.1);
+            color: white;
+            transform: translateX(5px);
+        }
+
+        .nav-link i {
+            margin-right: 1rem;
+            font-size: 1.25rem;
+        }
+
+        .search-container {
+            position: fixed;
+            top: 0;
+            left: 280px;
+            right: 0;
+            padding: 1rem 2rem;
+            background: var(--card-bg);
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+            transition: left 0.3s ease;
+            z-index: 40;
+            display: flex;
+            align-items: center;
+            gap: 1rem;
+        }
+
+        .search-box {
+            flex: 1;
+            padding: 0.75rem 1rem;
+            border: 2px solid #E2E8F0;
+            border-radius: 12px;
+            outline: none;
+            font-size: 1rem;
+            transition: all 0.2s ease;
+            background: var(--bg-color);
+        }
+
+        .search-box:focus {
+            border-color: var(--primary);
+            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
+        }
+
+        .main-content {
+            margin-left: 280px;
+            width: calc(100% - 280px);
+            padding-top: 5rem;
+            transition: margin-left 0.3s ease;
+        }
+
+        .container {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
+            gap: 2rem;
+            padding: 2rem;
+            max-width: 1600px;
+            margin: 0 auto;
+        }
+
+        .topic-card {
+            background: var(--card-bg);
+            border-radius: 20px;
+            padding: 2rem;
+            position: relative;
+            overflow: hidden;
+            border: 1px solid rgba(255, 255, 255, 0.1);
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+            transform: translateY(0);
+            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
+            box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+            display: flex;
+            flex-direction: column;
+            gap: 1.5rem;
+        }
+
+        .topic-card::before {
+            content: '';
+            position: absolute;
+            top: 0;
+            left: 0;
+            width: 100%;
+            height: 5px;
+            background: linear-gradient(90deg, var(--primary), var(--accent));
+            transform: scaleX(0);
+            transform-origin: left;
+            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .topic-card:hover {
+            transform: translateY(-5px);
+            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
+            0 10px 10px -5px rgba(0, 0, 0, 0.04);
+        }
+
+        .topic-card:hover::before {
+            transform: scaleX(1);
+        }
+
+        .topic-header {
+            display: flex;
+            align-items: center;
+            margin-bottom: 1.5rem;
+            position: relative;
+        }
+
+        .topic-icon {
+            font-size: 2.5rem;
+            color: var(--primary);
+            margin-right: 1rem;
+            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
+            color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .topic-card:hover .topic-icon {
+            transform: rotate(-10deg);
+            color: var(--accent);
+        }
+
+        .topic-title {
+            font-size: 1.5rem;
+            font-weight: 600;
+            color: var(--text-primary);
+            margin-bottom: 0.5rem;
+        }
+
+        .topic-description {
+            font-size: 1rem;
+            color: var(--text-secondary);
+            line-height: 1.7;
+            margin-bottom: 1.5rem;
+        }
+
+        .related-topics {
+            margin: 0;
+        }
+
+        .download-section {
+            margin-top: auto;
+        }
+
+        .progress-container {
+            margin-top: 1.5rem;
+        }
+
+        .download-section h4 {
+            margin-bottom: 1rem;
+            font-size: 1rem;
+        }
+
+        .download-links {
+            display: flex;
+            gap: 1rem;
+            flex-wrap: wrap;
+        }
+
+        .download-btn {
+            background: rgba(255, 255, 255, 0.1);
+            color: white;
+            padding: 0.75rem 1.25rem;
+            border-radius: 10px;
+            text-decoration: none;
+            font-size: 0.9rem;
+            transition: all 0.2s ease;
+            backdrop-filter: blur(5px);
+            flex: 1;
+            min-width: 120px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            gap: 0.5rem;
+            transform: translateY(0);  /* Set initial transform state */
+            transition: all 0.2s ease;
+        }
+
+        .download-btn:hover {
+            transform: translateY(-2px);
+            background: rgba(255, 255, 255, 0.2);
+        }
+
+        .progress-label {
+            display: flex;
+            justify-content: space-between;
+            margin-bottom: 0.5rem;
+            font-size: 0.9rem;
+            color: var(--text-secondary);
+        }
+
+        .progress-bar {
+            height: 8px;
+            background: #E2E8F0;
+            border-radius: 4px;
+            overflow: hidden;
+        }
+
+        .progress {
+            height: 100%;
+            background: linear-gradient(90deg, var(--primary), var(--accent));
+            border-radius: 4px;
+            width: 0%;
+            transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        @media (max-width: 1024px) {
+            .sidebar {
+                transform: translateX(-100%);
+            }
+
+            .sidebar.active {
+                transform: translateX(0);
+            }
+
+            .main-content {
+                margin-left: 0;
+                width: 100%;
+            }
+
+            .search-container {
+                left: 0;
+            }
+        }
+
+        .menu-toggle {
+            position: fixed;
+            top: 1rem;
+            left: 1rem;
+            z-index: 60;
+            background: white;
+            border: none;
+            padding: 0.75rem;
+            border-radius: 10px;
+            cursor: pointer;
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+            display: none;
+        }
+
+        @media (max-width: 1024px) {
+            .menu-toggle {
+                display: block;
+            }
+        }
+        /* Add floating animation for icons */
+        @keyframes float {
+            0%, 100% { transform: translateY(0); }
+            50% { transform: translateY(-10px); }
+        }
+
+        /* Add theme toggle button styles */
+        .theme-toggle {
+            position: fixed;
+            top: 1rem;
+            right: 1rem;
+            z-index: 100;
+            background: var(--card-bg);
+            border: none;
+            padding: 0.75rem;
+            border-radius: 50%;
+            cursor: pointer;
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+            color: var(--text-primary);
+            transition: all 0.3s ease;
+        }
+
+        .theme-toggle:hover {
+            transform: rotate(45deg);
+        }
+
+        /* Update animation keyframes */
+        @keyframes cardAppear {
+            0% {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            100% {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
+
+        /* Add these styles back for the download section */
+        .download-section {
+            background: linear-gradient(135deg, var(--primary-light), var(--primary));
+            padding: 1.5rem;
+            border-radius: 12px;
+            color: white;
+            margin-top: auto;
+        }
+
+        .download-section h4 {
+            margin-bottom: 1rem;
+            font-size: 1rem;
+            color: rgba(255, 255, 255, 0.9);
+        }
+
+        .download-links {
+            display: flex;
+            gap: 1rem;
+            flex-wrap: wrap;
+        }
+
+        .download-btn {
+            background: rgba(255, 255, 255, 0.1);
+            color: white;
+            padding: 0.75rem 1.25rem;
+            border-radius: 10px;
+            text-decoration: none;
+            font-size: 0.9rem;
+            transition: all 0.2s ease;
+            backdrop-filter: blur(5px);
+            flex: 1;
+            min-width: 120px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            gap: 0.5rem;
+        }
+
+        .download-btn:hover {
+            background: rgba(255, 255, 255, 0.2);
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+        }
+
+        /* Add these styles for the related-topics section */
+        .related-topics {
+            background: rgba(124, 58, 237, 0.05);
+            padding: 1.25rem;
+            border-radius: 12px;
+            margin-bottom: 1.5rem;
+        }
+
+        .related-topics h4 {
+            color: var(--primary);
+            margin-bottom: 1rem;
+            font-size: 1rem;
+        }
+
+        .related-topics ul {
+            list-style: none;
+            display: flex;
+            flex-wrap: wrap;
+            gap: 0.5rem;
+        }
+
+        .related-topics li {
+            background: white;
+            padding: 0.5rem 1rem;
+            border-radius: 20px;
+            font-size: 0.9rem;
+            color: var(--text-secondary);
+            border: 1px solid rgba(124, 58, 237, 0.2);
+            transition: all 0.2s ease;
+            cursor: pointer;
+        }
+
+        .related-topics li:hover {
+            background: var(--primary);
+            color: white;
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+        }
+
+        /* Add dark mode support for related topics */
+        :root[data-theme="dark"] .related-topics {
+            background: rgba(124, 58, 237, 0.1);
+        }
+
+        :root[data-theme="dark"] .related-topics li {
+            background: var(--card-bg);
+            border-color: rgba(124, 58, 237, 0.3);
+        }
+
+        /* Improved search box */
+        .search-box {
+            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
+        }
+
+        .search-box:focus {
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(124, 58, 237, 0.15);
+        }
+
+        /* Improved topic card hover */
+        .topic-card {
+            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .topic-card:hover {
+            transform: translateY(-5px) scale(1.01);
+            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
+        }
+
+        /* Improved icon animation */
+        .topic-icon {
+            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .topic-card:hover .topic-icon {
+            transform: scale(1.2) rotate(-10deg);
+            color: var(--accent);
+        }
+
+        /* Active nav link style */
+        .nav-link.active {
+            background: rgba(255, 255, 255, 0.15);
+            color: white;
+            font-weight: 600;
+        }
+    </style>
+</head>
+<body>
+<button class="menu-toggle" onclick="toggleSidebar()">
+    <i class="fas fa-bars"></i>
+</button>
+
+<nav class="sidebar">
+    <div class="sidebar-header">
+        <i class="fas fa-graduation-cap"></i>
+        <h2><?php echo($subjectData->displayName); ?></h2>
+    </div>
+    <!-- Remove this section -->
+    <!-- <div class="accessibility-controls mb-4">...</div> -->
+
+    <a href="homepage.php" class="nav-link">
+        <i class="fas fa-home"></i> Homepage
+    </a>
+    <a href="#" class="nav-link">
+        <i class="fas fa-book"></i> Kurse
+    </a>
+    <a href="#" class="nav-link">
+        <i class="fas fa-trophy"></i> Erfolge
+    </a>
+    <a href="#" class="nav-link">
+        <i class="fas fa-chart-line"></i> Fortschritt
+    </a>
+    <a href="#" class="nav-link">
+        <i class="fas fa-question-circle"></i> Hilfe
+    </a>
+</nav>
+
+<div class="search-container">
+    <input type="text" class="search-box" id="searchInput" placeholder="Suche nach Themen, Übungen oder Hilfe..." oninput="handleSearch()">
+</div>
+
+<div class="main-content">
+    <div class="container">
+
+        <?php
+
+        foreach ($topics as $topic) {
+            ?>
+
+            <div class="topic-card" onclick="window.location.href='topic.php?subject=<?php echo($topic->subjectId); ?>&topic=<?php echo($topic->id); ?>'" style="cursor: pointer;">
+                <div class="topic-header">
+                    <i class="fas <?php echo($topic->icon); ?> topic-icon"></i>
+                    <h3 class="topic-title"><?php echo($topic->displayName); ?></h3>
+                </div>
+                <div class="topic-content">
+                    <p class="topic-description">
+                        <?php echo($topic->description); ?>
+                    </p>
+                    <div class="related-topics">
+                        <h4>Verwandte Themen:</h4>
+                        <ul>
+                            <?php
+                                foreach ($topic->relatedTopics as $relatedTopic) {
+                                    ?>
+
+                                    <li><?php echo($relatedTopic); ?></li>
+
+                                    <?php
+                                }
+                            ?>
+                        </ul>
+                    </div>
+                </div>
+                <div class="download-section">
+                    <h4>Übungen herunterladen:</h4>
+                    <div class="download-links">
+                        <?php
+                            foreach ($topic->files as $file) {
+                                ?>
+
+
+                                <a href="#" class="download-btn">
+                                    <i class="fas fa-file-pdf"></i>
+                                    <?php echo($file); ?>
+                                </a>
+
+                                <?php
+                            }
+                        ?>
+
+
+                        <a href="#" class="download-btn">
+                            <i class="fas fa-file-pdf"></i>
+                            Übung 1
+                        </a>
+                        <a href="#" class="download-btn">
+                            <i class="fas fa-file-pdf"></i>
+                            Übung 2
+                        </a>
+                    </div>
+                </div>
+                <div class="progress-bar" data-progress="100">
+                    <div class="progress"></div>
+                </div>
+            </div>
+
+            <?php
+        }
+        ?>
+
+    </div>
+</div>
+
+<script>
+    function toggleSidebar() {
+        document.querySelector('.sidebar').classList.toggle('active');
+    }
+
+    // Animate progress bars on load
+    document.addEventListener('DOMContentLoaded', () => {
+        const progressBars = document.querySelectorAll('.progress-bar');
+        progressBars.forEach(bar => {
+            const progressContainer = bar.closest('.progress-container');
+            const progressLabel = progressContainer.querySelector('.progress-label');
+            const percentage = progressLabel.lastElementChild.textContent.replace('%', '');
+
+            setTimeout(() => {
+                bar.style.width = percentage + '%';
+            }, 300);
+        });
+    });
+
+    // Theme toggle functionality
+    function toggleTheme() {
+        const root = document.documentElement;
+        const themeToggle = document.querySelector('.theme-toggle i');
+
+        if (root.getAttribute('data-theme') === 'dark') {
+            root.removeAttribute('data-theme');
+            themeToggle.classList.remove('fa-sun');
+            themeToggle.classList.add('fa-moon');
+            localStorage.setItem('theme', 'light');
+        } else {
+            root.setAttribute('data-theme', 'dark');
+            themeToggle.classList.remove('fa-moon');
+            themeToggle.classList.add('fa-sun');
+            localStorage.setItem('theme', 'dark');
+        }
+    }
+
+    // Check for saved theme preference
+    document.addEventListener('DOMContentLoaded', () => {
+        const savedTheme = localStorage.getItem('theme');
+        const root = document.documentElement;
+        const themeToggle = document.querySelector('.theme-toggle i');
+
+        if (savedTheme === 'dark') {
+            root.setAttribute('data-theme', 'dark');
+            themeToggle.classList.remove('fa-moon');
+            themeToggle.classList.add('fa-sun');
+        }
+
+        // Add stagger effect to cards
+        const cards = document.querySelectorAll('.topic-card');
+        cards.forEach((card, index) => {
+            card.style.animationDelay = `${index * 0.1}s`;
+        });
+
+        // Initialize progress bars
+        const progressBars = document.querySelectorAll('.progress-bar');
+        progressBars.forEach(bar => {
+            const progress = bar.getAttribute('data-progress');
+            const progressElement = bar.querySelector('.progress');
+            setTimeout(() => {
+                progressElement.style.width = `${progress}%`;
+            }, 300);
+        });
+    });
+
+    // Update progress bars to 100%
+    document.addEventListener('DOMContentLoaded', () => {
+        const progressBars = document.querySelectorAll('.progress-bar');
+        progressBars.forEach(bar => {
+            const progressElement = bar.querySelector('.progress');
+            setTimeout(() => {
+                progressElement.style.width = '100%';
+            }, 300);
+        });
+    });
+
+    // Add preview functionality
+    function togglePreview(element) {
+        const previewContent = element.nextElementSibling;
+        const isHidden = previewContent.style.display === 'none';
+
+        if (isHidden) {
+            // Load preview content
+            previewContent.innerHTML = `
+                       <div class="p-4 bg-gray-50 rounded-lg mt-4">
+                           <h4 class="font-semibold mb-2">Schnelle Übung:</h4>
+                           <div class="interactive-question mb-4">
+                               <!-- Dynamic content based on topic -->
+                           </div>
+                       </div>
+                   `;
+
+            gsap.to(previewContent, {
+                height: 'auto',
+                opacity: 1,
+                duration: 0.3,
+                display: 'block'
+            });
+        } else {
+            gsap.to(previewContent, {
+                height: 0,
+                opacity: 0,
+                duration: 0.3,
+                onComplete: () => {
+                    previewContent.style.display = 'none';
+                }
+            });
+        }
+    }
+
+    // Add card hover effects
+    document.querySelectorAll('.topic-card').forEach(card => {
+        card.addEventListener('mouseenter', () => {
+            gsap.to(card.querySelector('.topic-icon'), {
+                rotate: -10,
+                scale: 1.2,
+                duration: 0.3
+            });
+        });
+
+        card.addEventListener('mouseleave', () => {
+            gsap.to(card.querySelector('.topic-icon'), {
+                rotate: 0,
+                scale: 1,
+                duration: 0.3
+            });
+        });
+    });
+
+    function handleSearch() {
+        const searchTerm = document.getElementById('searchInput').value.toLowerCase();
+        const topicCards = document.querySelectorAll('.topic-card');
+
+        topicCards.forEach(card => {
+            const title = card.querySelector('.topic-title').textContent.toLowerCase();
+            const description = card.querySelector('.topic-description').textContent.toLowerCase();
+            const relatedTopics = Array.from(card.querySelectorAll('.related-topics li'))
+                .map(li => li.textContent.toLowerCase())
+                .join(' ');
+
+            const content = `${title} ${description} ${relatedTopics}`;
+
+            if (content.includes(searchTerm)) {
+                card.style.display = 'block';
+                // Optional: Add animation for appearing cards
+                gsap.to(card, {
+                    opacity: 1,
+                    y: 0,
+                    duration: 0.3
+                });
+            } else {
+                card.style.display = 'none';
+            }
+        });
+    }
+</script>
+
+<!-- Code injected by live-server -->
+</body></html>
diff --git a/webseite/topic.php b/webseite/topic.php
new file mode 100644
index 0000000..7cf77e7
--- /dev/null
+++ b/webseite/topic.php
@@ -0,0 +1,406 @@
+<!DOCTYPE html>
+
+<?php
+require_once ("classes/SubjectData.php");
+require_once ("classes/TopicData.php");
+
+$subjectData = SubjectData::fromName($_GET["subject"]);
+$topicData = TopicData::fromName($_GET["subject"], $_GET["topic"]);
+
+?>
+
+<html lang="de">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title><?php echo($topicData->displayName); ?> - <?php echo($subjectData->displayName); ?></title>
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.12.2/gsap.min.js"></script>
+    <style>
+        * {
+            margin: 0;
+            padding: 0;
+            box-sizing: border-box;
+            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+        }
+
+        :root {
+            --primary: #7C3AED;
+            --primary-light: #9F67FF;
+            --primary-dark: #6D28D9;
+            --bg-color: #F4F7FE;
+            --card-bg: #ffffff;
+            --text-primary: #1E293B;
+            --text-secondary: #64748B;
+            --accent: #F59E0B;
+        }
+
+        body {
+            background-color: var(--bg-color);
+            min-height: 100vh;
+            display: flex;
+            overflow-x: hidden;
+        }
+
+        /* Left Sidebar Styles */
+        .sidebar {
+            width: 280px;
+            height: 100vh;
+            background: var(--primary);
+            padding: 2rem;
+            position: fixed;
+            left: 0;
+            top: 0;
+            transition: transform 0.3s ease;
+            z-index: 50;
+        }
+
+        .sidebar-header {
+            color: white;
+            margin-bottom: 2rem;
+            display: flex;
+            align-items: center;
+            gap: 1rem;
+        }
+
+        .sidebar-header i {
+            font-size: 2rem;
+        }
+
+        .nav-link {
+            display: flex;
+            align-items: center;
+            padding: 1rem;
+            color: rgba(255, 255, 255, 0.8);
+            text-decoration: none;
+            border-radius: 12px;
+            margin-bottom: 0.5rem;
+            transition: all 0.2s ease;
+        }
+
+        .nav-link:hover {
+            background: rgba(255, 255, 255, 0.1);
+            color: white;
+            transform: translateX(5px);
+        }
+
+        .nav-link i {
+            margin-right: 1rem;
+            font-size: 1.25rem;
+        }
+
+        /* Main Content Styles */
+        .main-content {
+            margin-left: 280px;
+            margin-right: 300px;
+            padding: 2rem;
+            flex: 1;
+        }
+
+        .search-container {
+            position: sticky;
+            top: 0;
+            background: var(--card-bg);
+            padding: 1rem;
+            border-radius: 12px;
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+            margin-bottom: 2rem;
+            z-index: 40;
+        }
+
+        .search-box {
+            width: 100%;
+            padding: 0.75rem 1rem;
+            border: 2px solid #E2E8F0;
+            border-radius: 12px;
+            outline: none;
+            font-size: 1rem;
+            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
+        }
+
+        .search-box:focus {
+            border-color: var(--primary);
+            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
+            transform: translateY(-2px);
+            box-shadow: 0 4px 12px rgba(124, 58, 237, 0.15);
+        }
+
+        /* Content Card Styles */
+        .content-card {
+            background: var(--card-bg);
+            border-radius: 20px;
+            padding: 2rem;
+            margin-bottom: 2rem;
+            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .content-card:hover {
+            transform: translateY(-5px);
+            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
+        }
+
+        .content-title {
+            font-size: 2rem;
+            color: var(--text-primary);
+            margin-bottom: 1rem;
+        }
+
+        .content-text {
+            color: var(--text-secondary);
+            line-height: 1.7;
+            margin-bottom: 1.5rem;
+        }
+
+        /* Right Sidebar Styles */
+        .right-sidebar {
+            width: 300px;
+            height: 100vh;
+            position: fixed;
+            right: 0;
+            top: 0;
+            padding: 2rem;
+            background: var(--card-bg);
+            border-left: 1px solid rgba(0, 0, 0, 0.1);
+        }
+
+        .related-topics {
+            background: rgba(124, 58, 237, 0.05);
+            padding: 1.25rem;
+            border-radius: 12px;
+            margin-bottom: 1.5rem;
+        }
+
+        .related-topics h3 {
+            color: var(--primary);
+            margin-bottom: 1rem;
+        }
+
+        .topic-tag {
+            display: inline-block;
+            padding: 0.5rem 1rem;
+            background: white;
+            border-radius: 20px;
+            margin: 0.25rem;
+            font-size: 0.9rem;
+            color: var(--text-secondary);
+            border: 1px solid rgba(124, 58, 237, 0.2);
+            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+            cursor: pointer;
+        }
+
+        .topic-tag:hover {
+            background: var(--primary);
+            color: white;
+            transform: translateY(-3px);
+            box-shadow: 0 4px 12px rgba(124, 58, 237, 0.2);
+        }
+
+        /* Exercise Section Styles */
+        .exercise-section {
+            background: linear-gradient(135deg, var(--primary-light), var(--primary));
+            padding: 1.5rem;
+            border-radius: 12px;
+            color: white;
+            margin-top: 2rem;
+            position: relative;
+            overflow: hidden;
+        }
+
+        .exercise-section::before {
+            content: '';
+            position: absolute;
+            top: 0;
+            left: 0;
+            width: 100%;
+            height: 100%;
+            background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1));
+            pointer-events: none;
+        }
+
+        .download-btn {
+            display: inline-flex;
+            align-items: center;
+            gap: 0.5rem;
+            background: rgba(255, 255, 255, 0.1);
+            color: white;
+            padding: 0.75rem 1.25rem;
+            border-radius: 10px;
+            text-decoration: none;
+            margin: 0.5rem;
+            backdrop-filter: blur(5px);
+            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+        }
+
+        .download-btn:hover {
+            background: rgba(255, 255, 255, 0.2);
+            transform: translateY(-3px);
+            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
+        }
+
+        /* Responsive Design */
+        @media (max-width: 1200px) {
+            .right-sidebar {
+                display: none;
+            }
+            .main-content {
+                margin-right: 0;
+            }
+        }
+
+        @media (max-width: 768px) {
+            .sidebar {
+                transform: translateX(-100%);
+            }
+            .sidebar.active {
+                transform: translateX(0);
+            }
+            .main-content {
+                margin-left: 0;
+            }
+        }
+
+        /* Active nav link style */
+        .nav-link.active {
+            background: rgba(255, 255, 255, 0.15);
+            color: white;
+            font-weight: 600;
+        }
+
+        /* List style improvement */
+        .content-text li {
+            position: relative;
+            padding-left: 1.5rem;
+            margin-bottom: 0.5rem;
+        }
+
+        .content-text li::before {
+            content: '•';
+            color: var(--primary);
+            position: absolute;
+            left: 0;
+            font-weight: bold;
+        }
+
+        /* Add this CSS to your existing styles */
+        document.head.insertAdjacentHTML('beforeend', `
+        <style>
+         mark {
+             background-color: rgba(124, 58, 237, 0.2);
+             color: inherit;
+             padding: 0 2px;
+             border-radius: 2px;
+             transition: background-color 0.3s ease;
+         }
+
+        mark:hover {
+            background-color: rgba(124, 58, 237, 0.4);
+        }
+    </style>
+    `);
+    </style>
+</head>
+<body>
+<!-- Left Sidebar -->
+<nav class="sidebar">
+    <div class="sidebar-header">
+        <i class="fas fa-graduation-cap"></i>
+        <h2><?php echo($subjectData->displayName); ?></h2>
+    </div>
+    <a href="homepage.php" class="nav-link">
+        <i class="fas fa-home"></i> Homepage
+    </a>
+    <a href="subject.php?subject=<?php echo($subjectData->id); ?>" class="nav-link">
+        <i class="fas fa-book"></i> <?php echo($subjectData->displayName); ?> Übersicht
+    </a>
+    <a href="#" class="nav-link active">
+        <i class="fas fa-calculator"></i> <?php echo($topicData->displayName); ?>
+    </a>
+</nav>
+
+<!-- Main Content -->
+<main class="main-content">
+    <div class="search-container">
+        <input type="text" class="search-box" id="searchInput" placeholder="Suche nach Themen, Übungen oder Hilfe..." oninput="handleContentSearch()">
+    </div>
+
+    <div class="content-card">
+        <h1 class="content-title"><?php echo($topicData->displayName); ?></h1>
+        <p class="content-text">
+            <?php echo($topicData->description); ?>
+        </p>
+        <p class="content-text">
+            <?php echo($topicData->article); ?>
+        </p>
+
+        <div class="exercise-section">
+            <h3 style="margin-bottom: 1rem;">Übungen herunterladen:</h3>
+            <div style="display: flex; flex-wrap: wrap; gap: 0.5rem;">
+                <?php
+                foreach ($topicData->files as $file) {
+                    ?>
+
+                    <a href="#" class="download-btn">
+                        <i class="fas fa-file-pdf"></i>
+                        <?php echo($file); ?>
+                    </a>
+
+                    <?php
+                }
+                ?>
+            </div>
+        </div>
+    </div>
+</main>
+
+<!-- Right Sidebar -->
+<aside class="right-sidebar">
+    <div class="related-topics">
+        <h3>Verwandte Themen</h3>
+        <div style="display: flex; flex-wrap: wrap; gap: 0.5rem;">
+            <?php
+            foreach ($topicData->relatedTopics as $relatedTopic) {
+                ?>
+
+                <span class="topic-tag"><?php echo($relatedTopic); ?></span>
+
+                <?php
+            }
+            ?>
+        </div>
+    </div>
+</aside>
+
+<!-- Add this script at the end of the body, before the closing body tag -->
+<script>
+    function handleContentSearch() {
+        const searchTerm = document.getElementById('searchInput').value.toLowerCase();
+        const contentElements = document.querySelectorAll('.content-text, .content-text li');
+
+        if (searchTerm.length < 2) {
+            // Remove all highlights if search term is too short
+            document.querySelectorAll('mark').forEach(mark => {
+                mark.outerHTML = mark.innerHTML;
+            });
+            return;
+        }
+
+        contentElements.forEach(element => {
+            let content = element.innerHTML;
+            // Remove existing highlights
+            content = content.replace(/<\/?mark>/g, '');
+
+            if (searchTerm) {
+                // Create a regular expression for case-insensitive search
+                const regex = new RegExp(`(${searchTerm})`, 'gi');
+                // Replace matches with highlighted text
+                content = content.replace(regex, '<mark>$1</mark>');
+            }
+
+            element.innerHTML = content;
+        });
+    }
+</script>
+</body>
+</html>