justify-content: center;
            background: linear-gradient(135deg, #533483, #e94560);
            color: white;
            font-size: 2.5em;
        }

        .video-label {
            position: absolute;
            bottom: 10px;
            left: 10px;
            background: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 0.8em;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .media-controls {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin: 20px 0;
        }

        .control-button {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            border: none;
            cursor: pointer;
            font-size: 1.2em;
            color: white;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .control-button.cam {
            background: #27ae60;
        }

        .control-button.mic {
            background: #3498db;
        }

        .control-button.screen {
            background: #9b59b6;
        }

        .control-button.leave {
            background: #e74c3c;
        }

        .control-button:hover {
            transform: scale(1.05);
        }

        .control-button.off {
            background: #7f8c8d;
        }

        .participants-section {
            background: rgba(15, 52, 96, 0.6);
            border-radius: 10px;
            padding: 15px;
            margin-top: 20px;
        }

        .participants-section h3 {
            margin-bottom: 15px;
            color: #e94560;
        }

        .participant-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            border-bottom: 1px solid #533483;
        }

        .participant-item:last-child {
            border-bottom: none;
        }

        .participant-avatar {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: linear-gradient(135deg, #e94560, #533483);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 0.8em;
            overflow: hidden;
        }

        .participant-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .chat-area {
            background: rgba(15, 52, 96, 0.6);
            border-radius: 10px;
            padding: 15px;
            margin-top: 20px;
            height: 250px;
            display: flex;
            flex-direction: column;
        }

        .chat-area h3 {
            margin-bottom: 10px;
            color: #e94560;
        }

        .chat-messages {
            flex: 1;
            overflow-y: auto;
            background: #1a1a2e;
            border-radius: 6px;
            padding: 10px;
            margin-bottom: 10px;
        }

        .chat-input-area {
            display: flex;
            gap: 10px;
        }

        .chat-input {
            flex: 1;
            padding: 8px 12px;
            background: #1a1a2e;
            border: 1px solid #533483;
            border-radius: 6px;
            color: #eee;
        }

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            background: #27ae60;
            color: white;
            padding: 15px 20px;
            border-radius: 8px;
            z-index: 1000;
            transform: translateX(100%);
            transition: transform 0.3s ease;
        }

        .notification.show {
            transform: translateX(0);
        }

        .notification.error {
            background: #e74c3c;
        }

        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid rgba(255,255,255,.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .hidden {
            display: none !important;
        }

        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            
            .user-info {
                position: static;
                margin-top: 20px;
                justify-content: center;
            }
            
            .header h1 {
                font-size: 2em;
            }
        }
    </style>
</head>
<body>
    <!-- Login Screen -->
    <div class="login-screen" id="loginScreen">
        <div class="login-container">
            <div class="login-header">
                <h1>BarCamp</h1>
                <p>Online Sessions & Workshops</p>
            </div>
            
            <div class="login-tabs">
                <button class="login-tab active" onclick="switchTab('guest')">Als Gast</button>
                <button class="login-tab" onclick="switchTab('admin')">Admin Login</button>
            </div>
            
            <!-- Guest Login -->
            <div class="login-form active" id="guestForm">
                <div class="guest-info">
                    <h3>Gast-Zugang</h3>
                    <p>Tritt als Gast bei und nimm an Sessions teil</p>
                </div>
                
                <div class="form-group">
                    <label for="guestName">Dein Name</label>
                    <input type="text" id="guestName" placeholder="z.B. Max Mustermann" maxlength="30">
                </div>
                
                <button class="login-button" onclick="guestLogin()">
                    <span id="guestLoginText">Als Gast beitreten</span>
                    <span id="guestLoginLoading" class="loading hidden"></span>
                </button>
            </div>
            
            <!-- Admin Login -->
            <div class="login-form" id="adminForm">
                <div class="form-group">
                    <label for="adminUsername">Benutzername</label>
                    <input type="text" id="adminUsername" placeholder="admin" value="admin">
                </div>
                
                <div class="form-group">
                    <label for="adminPassword">Passwort</label>
                    <input type="password" id="adminPassword" placeholder="Passwort eingeben" value="admin123">
                </div>
                
                <button class="login-button" onclick="adminLogin()">
                    <span id="adminLoginText">Anmelden</span>
                    <span id="adminLoginLoading" class="loading hidden"></span>
                </button>
                
                <div style="text-align: center; margin-top: 15px; color: #888; font-size: 0.9em;">
                    Standard: admin / admin123
                </div>
            </div>
        </div>
    </div>

    <!-- Main Application -->
    <div class="main-app" id="mainApp">
        <div class="container">
            <div class="header">
                <h1>BarCamp Platform</h1>
                <p>Online Sessions und Workshops</p>
                <div class="user-info">
                    <div class="user-avatar" id="userAvatar">U</div>
                    <div class="user-details">
                        <div class="user-name" id="userName">User</div>
                        <div class="user-role" id="userRole">guest</div>
                    </div>
                    <button class="logout-btn" onclick="logout()">Logout</button>
                </div>
            </div>

            <div class="main-content">
                <div class="control-panel" id="controlPanel">
                    <h2>Verwaltung</h2>
                    
                    <div class="input-group">
                        <label for="eventName">Event Name</label>
                        <input type="text" id="eventName" placeholder="z.B. Tech Meeting 2024">
                    </div>

                    <div class="input-group">
                        <label for="eventDesc">Beschreibung</label>
                        <textarea id="eventDesc" rows="3" placeholder="Event Beschreibung"></textarea>
                    </div>

                    <h3 style="margin: 25px 0 15px 0; color: #ccc;">Neuer Raum</h3>
                    
                    <div class="input-group">
                        <label for="roomName">Raum Name</label>
                        <input type="text" id="roomName" placeholder="Workshop Titel">
                    </div>

                    <div class="input-group">
                        <label for="hostName">Host Name</label>
                        <input type="text" id="hostName" placeholder="Name des Hosts">
                    </div>

                    <div class="input-group">
                        <label for="hostEmail">Host Email</label>
                        <input type="email" id="hostEmail" placeholder="email@example.com">
                    </div>

                    <div class="input-group">
                        <label for="maxUsers">Max. Teilnehmer</label>
                        <input type="number" id="maxUsers" value="25" min="5" max="100">
                    </div>

                    <button class="btn" onclick="createRoom()">
                        <span id="createRoomText">Raum erstellen</span>
                        <span id="createRoomLoading" class="loading hidden"></span>
                    </button>
                </div>

                <div class="rooms-area">
                    <h2>Verfügbare Räume</h2>
                    <div class="room-list" id="roomList">
                        <div class="loading" style="margin: 20px auto;"></div>
                    </div>
                </div>
            </div>

            <div class="conference-area" id="conferenceArea">
                <h2>Konferenz - <span id="currentRoomName">Raum</span></h2>
                
                <div class="video-section">
                    <div class="video-grid" id="videoGrid">
                        <div class="video-slot" id="localSlot">
                            <video id="localStream" autoplay muted playsinline></video>
                            <div class="video-placeholder" id="localPlaceholder">📷</div>
                            <div class="video-label">
                                <span id="localVideoName">Sie</span>
                            </div>
                        </div>
                    </div>

                    <div class="media-controls">
                        <button class="control-button cam off" id="camControl" onclick="toggleVideo()">📷</button>
                        <button class="control-button mic off" id="micControl" onclick="toggleAudio()">🎤</button>
                        <button class="control-button screen off" id="screenControl" onclick="toggleScreenShare()">🖥️</button>
                        <button class="control-button leave" onclick="exitRoom()">📞</button>
                    </div>
                </div>

                <div class="participants-section">
                    <h3>Teilnehmer</h3>
                    <div id="userList">
                        <!-- Participants will be shown here -->
                    </div>
                </div>

                <div class="chat-area">
                    <h3>Chat</h3>
                    <div class="chat-messages" id="chatBox">
                        <div style="color: #888; font-style: italic;">Chat bereit...</div>
                    </div>
                    <div class="chat-input-area">
                        <input type="text" class="chat-input" id="messageInput" placeholder="Nachricht..." onkeypress="handleEnter(event)">
                        <button class="btn small" onclick="sendMessage()">Senden</button>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        // Configuration
        const API_URL = 'api/data.php';
        
        // Global state
        let currentUser = null;
        let currentRoom = null;
        let rooms = {};
        let updateInterval = null;
        let mediaSettings = { video: false, audio: false, screen: false };
        let userStream = null;
        let displayStream = null;

        // Initialize
        document.addEventListener('DOMContentLoaded', () => {
            checkAuthStatus();
        });

        // Authentication Functions
        async function checkAuthStatus() {
            try {
                const response = await fetch(`${API_URL}?action=auth_status`);
                const data = await response.json();
                
                if (data.authenticated) {
                    currentUser = data;
                    showMainApp();
                } else {
                    showLoginScreen();
                }
            } catch (error) {
                console.error('Auth check failed:', error);
                showLoginScreen();
            }
        }

        function switchTab(tab) {
            // Update tab buttons
            document.querySelectorAll('.login-tab').forEach(btn => btn.classList.remove('active'));
            event.target.classList.add('active');
            
            // Update forms
            document.querySelectorAll('.login-form').forEach(form => form.classList.remove('active'));
            document.getElementById(tab + 'Form').classList.add('active');
        }

        async function guestLogin() {
            const name = document.getElementById('guestName').value.trim();
            
            if (!name) {
                showNotification('Bitte gib deinen Namen ein', true);
                return;
            }
            
            setLoading('guestLogin', true);
            
            try {
                const response = await fetch(`${API_URL}?action=guest_login`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ name: name })
                });
                
                const data = await response.json();
                
                if (data.success) {
                    currentUser = data.user;
                    showMainApp();
                    showNotification('Erfolgreich als Gast angemeldet');
                } else {
                    showNotification(data.error || 'Anmeldung fehlgeschlagen', true);
                }
            } catch (error) {
                console.error('Guest login failed:', error);
                showNotification('Verbindungsfehler', true);
            }
            
            setLoading('guestLogin', false);
        }

        async function adminLogin() {
            const username = document.getElementById('adminUsername').value.trim();
            const password = document.getElementById('adminPassword').value;
            
            if (!username || !password) {
                showNotification('Benutzername und Passwort erforderlich', true);
                return;
            }
            
            setLoading('adminLogin', true);
            
            try {
                const response = await fetch(`${API_URL}?action=login`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ username: username, password: password })
                });
                
                const data = await response.json();
                
                if (data.success) {
                    currentUser = data.user;
                    showMainApp();
                    showNotification('Erfolgreich als Administrator angemeldet');
                } else {
                    showNotification(data.error || 'Anmeldung fehlgeschlagen', true);
                }
            } catch (error) {
                console.error('Admin login failed:', error);
                showNotification('Verbindungsfehler', true);
            }
            
            setLoading('adminLogin', false);
        }

        async function logout() {
            if (currentRoom) {
                await leaveRoom();
            }
            
            try {
                await fetch(`${API_URL}?action=logout`, { method: 'POST' });
            } catch (error) {
                console.error('Logout failed:', error);
            }
            
            currentUser = null;
            showLoginScreen();
            showNotification('Erfolgreich abgemeldet');
        }

        function showLoginScreen() {
            document.getElementById('loginScreen').style.display = 'flex';
            document.getElementById('mainApp').classList.remove('active');
        }

        function showMainApp() {
            document.getElementById('loginScreen').style.display = 'none';
            document.getElementById('mainApp').classList.add('active');
            
            updateUserDisplay();
            loadRooms();
            
            // Hide admin controls for guests
            if (currentUser.role === 'guest') {
                document.getElementById('controlPanel').style.display = 'none';
            }
        }

        function updateUserDisplay() {
            if (!currentUser) return;
            
            document.getElementById('userName').textContent = currentUser.username;
            document.getElementById('userRole').textContent = currentUser.role.toUpperCase();
            document.getElementById('userAvatar').textContent = currentUser.username.charAt(0).toUpperCase();
            document.getElementById('localVideoName').textContent = currentUser.username;
        }

        // Room Functions
        async function loadRooms() {
            try {
                const response = await fetch(`${API_URL}?action=rooms`);
                const data = await response.json();
                
                if (data && typeof data === 'object') {
                    rooms = data;
                    displayRooms();
                } else {
                    console.error('Invalid rooms data:', data);
                }
            } catch (error) {
                console.error('Failed to load rooms:', error);
                showNotification('Fehler beim Laden der Räume', true);
            }
        }

        function displayRooms() {
            const container = document.getElementById('roomList');
            container.innerHTML = '';
            
            Object.values(rooms).forEach(room => {
                const roomDiv = document.createElement('div');
                roomDiv.className = 'room-item';
                
                const participantCount = room.participants ? room.participants.length : 0;
                
                roomDiv.innerHTML = `
                    <div class="room-header">
                        <div class="room-title">${room.name}</div>
                        <div class="room-status ${room.online ? 'status-active' : 'status-waiting'}">
                            ${room.online ? 'Online' : 'Wartet'}
                        </div>
                    </div>
                    <div class="room-details">
                        Host: ${room.host}<br>
                        Teilnehmer: ${participantCount}/${room.capacity}<br>
                        Erstellt: ${new Date(room.created).toLocaleDateString('de-DE')}
                    </div>
                    <div class="room-actions">
                        <button class="btn small" onclick="joinRoom('${room.id}')">Beitreten</button>
                        ${currentUser.role === 'admin' && room.id !== 'main' ? 
                            `<button class="btn small danger" onclick="deleteRoom('${room.id}')">Löschen</button>` : 
                            ''
                        }
                    </div>
                `;
                
                container.appendChild(roomDiv);
            });
        }

        async function createRoom() {
            if (currentUser.role !== 'admin') {
                showNotification('Nur Administratoren können Räume erstellen', true);
                return;
            }
            
            const name = document.getElementById('roomName').value.trim();
            const host = document.getElementById('hostName').value.trim();
            const email = document.getElementById('hostEmail').value.trim();
            const capacity = parseInt(document.getElementById('maxUsers').value);
            
            if (!name || !host) {
                showNotification('Raum-Name und Host sind erforderlich', true);
                return;
            }
            
            setLoading('createRoom', true);
            
            try {
                const response = await fetch(`${API_URL}?action=create_room`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ name, host, email, capacity })
                });
                
                const data = await response.json();
                
                if (data.success) {
                    // Clear form
                    document.getElementById('roomName').value = '';
                    document.getElementById('hostName').value = '';
                    document.getElementById('hostEmail').value = '';
                    document.getElementById('maxUsers').value = '25';
                    
                    await loadRooms();
                    showNotification(`Raum "${name}" wurde erstellt`);
                } else {
                    showNotification(data.error || 'Fehler beim Erstellen des Raums', true);
                }
            } catch (error) {
                console.error('Create room failed:', error);
                showNotification('Verbindungsfehler', true);
            }
            
            setLoading('createRoom', false);
        }

        async function joinRoom(roomId) {
            if (!roomId || !currentUser) return;
            
            try {
                const response = await fetch(`${API_URL}?action=join_room`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({
                        roomId: roomId,
                        user: {
                            id: currentUser.user_id,
                            name: currentUser.username,
                            role: currentUser.role
                        }
                    })
                });
                
                const data = await response.json();
                
                if (data.success) {
                    currentRoom = roomId;
                    
                    document.getElementById('conferenceArea').classList.add('active');
                    document.getElementById('currentRoomName').textContent = rooms[roomId].name;
                    
                    updateParticipants(data.participants);
                    document.getElementById('conferenceArea').scrollIntoView({ behavior: 'smooth' });
                    
                    startRoomUpdates();
                    await loadRooms();
                    
                    showNotification(`Raum "${rooms[roomId].name}" betreten`);
                } else {
                    showNotification(data.error || 'Fehler beim Betreten des Raums', true);
                }
            } catch (error) {
                console.error('Join room failed:', error);
                showNotification('Verbindungsfehler', true);
            }
        }

        async function leaveRoom() {
            if (!currentRoom || !currentUser) return;
            
            try {
                await fetch(`${API_URL}?action=leave_room`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ roomId: currentRoom })
                });
                
                stopMediaStreams();
                stopRoomUpdates();
                
                document.getElementById('conferenceArea').classList.remove('active');
                currentRoom = null;
                
                await loadRooms();
                showNotification('Raum verlassen');
                
            } catch (error) {
                console.error('Leave room failed:', error);
            }
        }

        async function deleteRoom(roomId) {
            if (currentUser.role !== 'admin' || roomId === 'main') return;
            
            if (!confirm('Raum wirklich löschen?')) return;
            
            try {
                const response = await fetch(`${API_URL}?action=room&roomId=${roomId}`, {
                    method: 'DELETE'
                });
                
                const data = await response.json();
                
                if (data.success) {
                    if (currentRoom === roomId) {
                        await leaveRoom();
                    }
                    
                    await loadRooms();
                    showNotification('Raum gelöscht');
                } else {
                    showNotification(data.error || 'Fehler beim Löschen', true);
                }
            } catch (error) {
                console.error('Delete room failed:', error);
                showNotification('Verbindungsfehler', true);
            }
        }

        function exitRoom() {
            leaveRoom();
        }

        // Participant Management
        function updateParticipants(participants) {
            const container = document.getElementById('userList');
            container.innerHTML = '';
            
            participants.forEach(participant => {
                const div = document.createElement('div');
                div.className = 'participant-item';
                
                div.innerHTML = `
                    <div class="participant-avatar">
                        ${participant.avatar ? 
                            `<img src="${participant.avatar}" alt="Avatar">` : 
                            participant.name.charAt(0).toUpperCase()
                        }
                    </div>
                    <div>${participant.name} ${participant.role === 'admin' ? '(Admin)' : ''}</div>
                `;
                
                container.appendChild(div);
            });
        }

        function startRoomUpdates() {
            if (updateInterval) clearInterval(updateInterval);
            
            updateInterval = setInterval(async () => {
                if (currentRoom) {
                    try {
                        const response = await fetch(`${API_URL}?action=room_participants&roomId=${currentRoom}`);
                        const participants = await response.json();
                        
                        if (Array.isArray(participants)) {
                            updateParticipants(participants);
                        }
                    } catch (error) {
                        console.error('Failed to update participants:', error);
                    }
                }
            }, 5000);
        }

        function stopRoomUpdates() {
            if (updateInterval) {
                clearInterval(updateInterval);
                updateInterval = null;
            }
        }

        // Media Functions
        async function toggleVideo() {
            if (!mediaSettings.video) {
                await startVideo();
            } else {
                stopVideo();
            }
        }

        async function toggleAudio() {
            if (!mediaSettings.audio) {
                await startAudio();
            } else {
                stopAudio();
            }
        }

        async function toggleScreenShare() {
            if (!mediaSettings.screen) {
                await startScreenShare();
            } else {
                stopScreenShare();
            }
        }

        async function startVideo() {
            try {
                const stream = await navigator.mediaDevices.getUserMedia({
                    video: { width: { ideal: 1280 }, height: { ideal: 720 } }
                });

                const video = document.getElementById('localStream');
                const placeholder = document.getElementById('localPlaceholder');
                
                video.srcObject = stream;
                video.style.display = 'block';
                placeholder.style.display = 'none';
                
                userStream = stream;
                mediaSettings.video = true;
                updateMediaControls();
                showNotification('Kamera aktiviert');
                
            } catch (error) {
                console.error('Video start failed:', error);
                showNotification('Kamera-Zugriff fehlgeschlagen', true);
            }
        }

        function stopVideo() {
            if (userStream) {
                userStream.getVideoTracks().forEach(track => track.stop());
            }
            
            const video = document.getElementById('localStream');
            const placeholder = document.getElementById('localPlaceholder');
            
            video.srcObject = null;
            video.style.display = 'none';
            placeholder.style.display = 'flex';
            
            mediaSettings.video = false;
            updateMediaControls();
            showNotification('Kamera deaktiviert');
        }

        async function startAudio() {
            try {
                const stream = await navigator.mediaDevices.getUserMedia({
                    audio: { echoCancellation: true, noiseSuppression: true }
                });

                if (userStream) {
                    stream.getAudioTracks().forEach(track => userStream.addTrack(track));
                } else {
                    userStream = stream;
                }

                mediaSettings.audio = true;
                updateMediaControls();
                showNotification('Mikrofon aktiviert');
                
            } catch (error) {
                console.error('Audio start failed:', error);
                showNotification('Mikrofon-Zugriff fehlgeschlagen', true);
            }
        }

        function stopAudio() {
            if (userStream) {
                userStream.getAudioTracks().forEach(track => track.stop());
            }
            
            mediaSettings.audio = false;
            updateMediaControls();
            showNotification('Mikrofon deaktiviert');
        }

        async function startScreenShare() {
            try {
                const stream = await navigator.mediaDevices.getDisplayMedia({
                    video: true,
                    audio: true
                });

                displayStream = stream;
                
                stream.getVideoTracks()[0].addEventListener('ended', () => {
                    stopScreenShare();
                });

                mediaSettings.screen = true;
                updateMediaControls();
                showNotification('Bildschirmübertragung gestartet');
                
            } catch (error) {
                if (error.name !== 'NotAllowedError') {
                    showNotification('Bildschirmfreigabe nicht verfügbar', true);
                }
            }
        }

        function stopScreenShare() {
            if (displayStream) {
                displayStream.getTracks().forEach(track => track.stop());
                displayStream = null;
            }
            
            mediaSettings.screen = false;
            updateMediaControls();
            showNotification('Bildschirmübertragung beendet');
        }

        function updateMediaControls() {
            document.getElementById('camControl').classList.toggle('off', !mediaSettings.video);
            document.getElementById('micControl').classList.toggle('off', !mediaSettings.audio);
            document.getElementById('screenControl').classList.toggle('off', !mediaSettings.screen);
        }

        function stopMediaStreams() {
            stopVideo();
            stopAudio();
            stopScreenShare();
        }

        // Chat Functions
        async function sendMessage() {
            if (!currentRoom || !currentUser) return;
            
            const input = document.getElementById('messageInput');
            const message = input.value.trim();
            
            if (!message) return;
            
            try {
                const response = await fetch(`${API_URL}?action=send_message`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({
                        roomId: currentRoom,
                        message: message
                    })
                });
                
                const data = await response.json();
                
                if (data.success) {
                    const chatBox = document.getElementById('chatBox');
                    const messageDiv = document.createElement('div');
                    messageDiv.innerHTML = `<strong>${data.message.username}:</strong> ${data.message.message}`;
                    messageDiv.style.marginBottom = '8px';
                    messageDiv.style.color = '#eee';
                    chatBox.appendChild(messageDiv);
                    
                    input.value = '';
                    chatBox.scrollTop = chatBox.scrollHeight;
                }
            } catch (error) {
                console.error('Send message failed:', error);
            }
        }

        function handleEnter(event) {
            if (event.key === 'Enter') {
                sendMessage();
            }
        }

        // Utility Functions
        function setLoading(element, loading) {
            const textElement = document.getElementById(element + 'Text');
            const loadingElement = document.getElementById(element + 'Loading');
            const buttonElement = textElement.closest('button');
            
            if (loading) {
                textElement.textContent = '';
                loadingElement.classList.remove('hidden');
                buttonElement.disabled = true;
            } else {
                loadingElement.classList.add('hidden');
                buttonElement.disabled = false;
                
                if (element === 'guestLogin') {
                    textElement.textContent = 'Als Gast beitreten';
                } else if (element === 'adminLogin') {
                    textElement.textContent = 'Anmelden';
                } else if (element === 'createRoom') {
                    textElement.textContent = 'Raum erstellen';
                }
            }
        }

        function showNotification(message, isError = false) {
            const notification = document.createElement('div');
            notification.className = 'notification';
            if (isError) notification.classList.add('error');
            notification.textContent = message;
            
            document.body.appendChild(notification);
            
            setTimeout(() => {
                notification.classList.add('show');
            }, 100);
            
            setTimeout(() => {
                notification.classList.remove('show');
                setTimeout(() => {
                    if (notification.parentNode) {
                        document.body.removeChild(notification);
                    }
                }, 300);
            }, 4000);
        }

        // Cleanup on page unload
        window.addEventListener('beforeunload', () => {
            if (currentRoom) {
                leaveRoom();
            }
            stopMediaStreams();
        });

        // Auto-refresh rooms every 30 seconds
        setInterval(() => {
            if (currentUser && !currentRoom) {
                loadRooms();
            }
        }, 30000);
    </script>
</body>
</html><!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>BarCamp - legolariors.de</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            color: #eee;
            min-height: 100vh;
            line-height: 1.6;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        /* Login Screen */
        .login-screen {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 20px;
        }

        .login-container {
            background: rgba(22, 33, 62, 0.9);
            backdrop-filter: blur(15px);
            border-radius: 20px;
            padding: 40px;
            border: 1px solid #533483;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
            max-width: 400px;
            width: 100%;
        }

        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .login-header h1 {
            font-size: 2.5em;
            color: #e94560;
            margin-bottom: 10px;
        }

        .login-header p {
            color: #bbb;
            font-size: 1.1em;
        }

        .login-tabs {
            display: flex;
            margin-bottom: 30px;
            background: #0f3460;
            border-radius: 10px;
            padding: 5px;
        }

        .login-tab {
            flex: 1;
            padding: 12px;
            text-align: center;
            background: transparent;
            color: #bbb;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .login-tab.active {
            background: #e94560;
            color: white;
            box-shadow: 0 2px 10px rgba(233, 69, 96, 0.4);
        }

        .login-form {
            display: none;
        }

        .login-form.active {
            display: block;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #ccc;
            font-weight: 500;
        }

        .form-group input {
            width: 100%;
            padding: 15px;
            background: rgba(15, 52, 96, 0.8);
            border: 1px solid #533483;
            border-radius: 10px;
            color: #eee;
            font-size: 1em;
            transition: all 0.3s ease;
        }

        .form-group input:focus {
            outline: none;
            border-color: #e94560;
            box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.2);
        }

        .login-button {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #e94560, #f27059);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1em;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-bottom: 15px;
        }

        .login-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(233, 69, 96, 0.4);
        }

        .login-button:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .guest-info {
            text-align: center;
            padding: 20px;
            background: rgba(15, 52, 96, 0.3);
            border-radius: 10px;
            margin-bottom: 20px;
        }

        .guest-info h3 {
            color: #e94560;
            margin-bottom: 10px;
        }

        .guest-info p {
            color: #bbb;
            font-size: 0.9em;
        }

        /* Main App */
        .main-app {
            display: none;
        }

        .main-app.active {
            display: block;
        }

        .header {
            background: linear-gradient(135deg, #16213e 0%, #0f3460 100%);
            border-radius: 15px;
            padding: 30px;
            margin-bottom: 30px;
            border: 1px solid #533483;
            position: relative;
        }

        .header h1 {
            font-size: 2.5em;
            color: #e94560;
            margin-bottom: 10px;
            font-weight: 700;
        }

        .header p {
            font-size: 1.1em;
            color: #bbb;
        }

        .user-info {
            position: absolute;
            top: 20px;
            right: 20px;
            display: flex;
            align-items: center;
            gap: 15px;
            background: rgba(15, 52, 96, 0.8);
            padding: 10px 20px;
            border-radius: 25px;
            border: 1px solid #533483;
        }

        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, #e94560, #533483);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 1.2em;
            cursor: pointer;
            overflow: hidden;
        }

        .user-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .user-details {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .user-name {
            color: #eee;
            font-weight: 600;
            font-size: 0.9em;
        }

        .user-role {
            color: #bbb;
            font-size: 0.8em;
            text-transform: uppercase;
        }

        .logout-btn {
            background: #c73650;
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 15px;
            cursor: pointer;
            font-size: 0.8em;
            font-weight: 500;
        }

        .logout-btn:hover {
            background: #a82d47;
        }

        .main-content {
            display: grid;
            grid-template-columns: 350px 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }

        .control-panel {
            background: rgba(22, 33, 62, 0.9);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 25px;
            border: 1px solid #533483;
            height: fit-content;
        }

        .control-panel h2 {
            color: #e94560;
            margin-bottom: 25px;
            font-size: 1.5em;
            border-bottom: 2px solid #533483;
            padding-bottom: 10px;
        }

        .rooms-area {
            background: rgba(22, 33, 62, 0.9);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 25px;
            border: 1px solid #533483;
        }

        .rooms-area h2 {
            color: #e94560;
            margin-bottom: 20px;
            font-size: 1.5em;
        }

        .room-list {
            display: grid;
            gap: 15px;
        }

        .room-item {
            background: rgba(15, 52, 96, 0.6);
            border: 1px solid #533483;
            border-radius: 12px;
            padding: 20px;
            transition: all 0.3s ease;
        }

        .room-item:hover {
            border-color: #e94560;
            box-shadow: 0 5px 20px rgba(233, 69, 96, 0.2);
        }

        .room-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }

        .room-title {
            font-size: 1.2em;
            font-weight: 600;
            color: #fff;
        }

        .room-status {
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: 500;
        }

        .status-active {
            background: #27ae60;
            color: white;
        }

        .status-waiting {
            background: #f39c12;
            color: white;
        }

        .room-details {
            color: #bbb;
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .room-actions {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .btn {
            background: linear-gradient(135deg, #e94560, #f27059);
            color: white;
            border: none;
            padding: 10px 18px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 500;
            font-size: 0.9em;
            transition: all 0.2s ease;
        }

        .btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 15px rgba(233, 69, 96, 0.4);
        }

        .btn.secondary {
            background: #533483;
        }

        .btn.danger {
            background: #c73650;
        }

        .btn.small {
            padding: 8px 14px;
            font-size: 0.85em;
        }

        .input-group {
            margin-bottom: 20px;
        }

        .input-group label {
            display: block;
            margin-bottom: 8px;
            color: #ccc;
            font-weight: 500;
        }

        .input-group input,
        .input-group textarea,
        .input-group select {
            width: 100%;
            padding: 12px;
            background: rgba(15, 52, 96, 0.6);
            border: 1px solid #533483;
            border-radius: 8px;
            color: #eee;
            font-size: 0.95em;
        }

        .input-group input:focus,
        .input-group textarea:focus,
        .input-group select:focus {
            outline: none;
            border-color: #e94560;
            box-shadow: 0 0 0 2px rgba(233, 69, 96, 0.2);
        }

        .conference-area {
            background: rgba(22, 33, 62, 0.9);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 25px;
            border: 1px solid #533483;
            margin-top: 30px;
            display: none;
        }

        .conference-area.active {
            display: block;
        }

        .conference-area h2 {
            color: #e94560;
            margin-bottom: 20px;
        }

        .video-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 15px;
            margin-bottom: 20px;
        }

        .video-slot {
            background: #000;
            border-radius: 12px;
            aspect-ratio: 16/9;
            position: relative;
            overflow: hidden;
        }

        .video-slot video {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .video-placeholder {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            display: flex;
            align-items: center;