* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(135deg, #0d0d0e 0%, #16274b 50%, #16213e 100%);
            color: #e0e6ed;
            height: 100vh;
            overflow: hidden;
        }

        .container {
            display: flex;
            height: 100vh;
            max-width: 1400px;
            margin: 0 auto;
            background: rgba(26, 38, 46, 0.8);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }

        .sidebar {
            width: 300px;
            background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
            padding: 20px;
            border-right: 1px solid #2a2a4e;
            overflow-y: auto;
        }

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

        .logo h1 {
            color: #649aff;
            font-size: 24px;
            margin-bottom: 5px;
            text-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
        }

        .logo p {
            color: #8892b0;
            font-size: 12px;
        }

        .quick-actions {
            margin-bottom: 30px;
        }

        .quick-actions h3 {
            color: #ccd6f6;
            margin-bottom: 15px;
            font-size: 16px;
        }

        .action-btn {
            display: block;
            width: 100%;
            padding: 12px 15px;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #64ffda 0%, #1500d4 100%);
            color: #0a192f;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            font-size: 14px;
        }

        .action-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(100, 255, 218, 0.3);
        }

        .topics-list {
            margin-bottom: 30px;
        }

        .topics-list h3 {
            color: #ccd6f6;
            margin-bottom: 15px;
            font-size: 16px;
        }

        .topic-item {
            display: block;
            padding: 10px 15px;
            margin-bottom: 8px;
            background: rgba(100, 255, 218, 0.1);
            border: 1px solid rgba(100, 255, 218, 0.2);
            border-radius: 6px;
            color: #64a7ff;
            text-decoration: none;
            transition: all 0.3s ease;
            font-size: 13px;
        }

        .topic-item:hover {
            background: rgba(100, 255, 218, 0.2);
            transform: translateX(5px);
        }

        .main-chat {
            flex: 1;
            display: flex;
            flex-direction: column;
            background: rgba(10, 25, 47, 0.5);
        }

        .chat-header {
            padding: 20px 30px;
            background: linear-gradient(90deg, #1a1a2e 0%, #16213e 100%);
            border-bottom: 1px solid #2a2a4e;
        }

        .chat-header h2 {
            color: #ccd6f6;
            margin-bottom: 5px;
        }

        .chat-header p {
            color: #8892b0;
            font-size: 14px;
        }

        .chat-messages {
            flex: 1;
            padding: 20px 30px;
            overflow-y: auto;
            scroll-behavior: smooth;
        }

        .message {
            margin-bottom: 20px;
            display: flex;
            align-items: flex-start;
            animation: fadeIn 0.5s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .message.user {
            flex-direction: row-reverse;
        }

        .message-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 18px;
            margin: 0 15px;
        }

        .user .message-avatar {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .bot .message-avatar {
            background: linear-gradient(135deg, #64ffda 0%, #00d4aa 100%);
            color: #0a192f;
        }

        .message-content {
            max-width: 70%;
            padding: 15px 20px;
            border-radius: 15px;
            line-height: 1.6;
        }

        .user .message-content {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-bottom-right-radius: 5px;
        }

        .bot .message-content {
            background: rgba(100, 255, 218, 0.1);
            border: 1px solid rgba(100, 255, 218, 0.2);
            color: #e0e6ed;
            border-bottom-left-radius: 5px;
        }

        .follow-up-buttons {
            margin-top: 15px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .follow-up-btn {
            padding: 8px 15px;
            background: rgba(100, 255, 218, 0.2);
            border: 1px solid rgba(100, 255, 218, 0.3);
            border-radius: 20px;
            color: #64ffda;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 12px;
        }

        .follow-up-btn:hover {
            background: rgba(100, 255, 218, 0.3);
            transform: scale(1.05);
        }

        .diagram {
            margin: 15px 0;
            padding: 20px;
            background: rgba(26, 26, 46, 0.5);
            border-radius: 10px;
            border: 1px solid rgba(100, 255, 218, 0.2);
            text-align: center;
        }

        .quiz-container {
            margin: 15px 0;
            padding: 20px;
            background: rgba(26, 26, 46, 0.7);
            border-radius: 10px;
            border: 1px solid rgba(100, 255, 218, 0.2);
        }

        .quiz-question {
            color: #ccd6f6;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .quiz-option {
            display: block;
            padding: 10px 15px;
            margin-bottom: 8px;
            background: rgba(100, 255, 218, 0.1);
            border: 1px solid rgba(100, 255, 218, 0.2);
            border-radius: 6px;
            color: #64ffda;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .quiz-option:hover {
            background: rgba(100, 255, 218, 0.2);
        }

        .quiz-option.correct {
            background: rgba(76, 175, 80, 0.3);
            border-color: #4caf50;
        }

        .quiz-option.incorrect {
            background: rgba(244, 67, 54, 0.3);
            border-color: #f44336;
        }

        .chat-input-container {
            padding: 20px 30px;
            background: linear-gradient(90deg, #1a1a2e 0%, #16213e 100%);
            border-top: 1px solid #2a2a4e;
        }

        .chat-input {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .chat-input input {
            flex: 1;
            padding: 15px 20px;
            background: rgba(26, 26, 46, 0.8);
            border: 1px solid rgba(100, 255, 218, 0.3);
            border-radius: 25px;
            color: #e0e6ed;
            font-size: 16px;
            outline: none;
            transition: all 0.3s ease;
        }

        .chat-input input:focus {
            border-color: #64ffda;
            box-shadow: 0 0 20px rgba(100, 255, 218, 0.2);
        }

        .chat-input input::placeholder {
            color: #8892b0;
        }

        .send-btn {
            padding: 15px 25px;
            background: linear-gradient(135deg, #64ffda 0%, #00d4aa 100%);
            color: #0a192f;
            border: none;
            border-radius: 25px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .send-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 8px 25px rgba(100, 255, 218, 0.3);
        }

        .typing-indicator {
            display: none;
            padding: 10px 20px;
            color: #8892b0;
            font-style: italic;
        }

        .citation {
            margin-top: 10px;
            padding: 10px;
            background: rgba(100, 255, 218, 0.1);
            border-left: 3px solid #64ffda;
            border-radius: 5px;
            font-size: 12px;
            color: #8892b0;
        }

        .learning-path {
            margin: 15px 0;
            padding: 15px;
            background: linear-gradient(135deg, rgba(100, 255, 218, 0.1) 0%, rgba(0, 212, 170, 0.1) 100%);
            border-radius: 10px;
            border: 1px solid rgba(100, 255, 218, 0.2);
        }

        .learning-path h4 {
            color: #64ffda;
            margin-bottom: 10px;
        }

        .learning-path ul {
            list-style: none;
            padding-left: 0;
        }

        .learning-path li {
            padding: 5px 0;
            color: #ccd6f6;
            border-bottom: 1px solid rgba(100, 255, 218, 0.1);
        }

        .learning-path li:before {
            content: '→ ';
            color: #64ffda;
            font-weight: bold;
        }

        .svg-diagram {
            width: 100%;
            max-width: 400px;
            height: auto;
        }

        .scrollbar::-webkit-scrollbar {
            width: 8px;
        }

        .scrollbar::-webkit-scrollbar-track {
            background: rgba(26, 26, 46, 0.5);
        }

        .scrollbar::-webkit-scrollbar-thumb {
            background: rgba(100, 255, 218, 0.3);
            border-radius: 4px;
        }

        .scrollbar::-webkit-scrollbar-thumb:hover {
            background: rgba(100, 255, 218, 0.5);
        }

        @media (max-width: 768px) {
            .container {
                flex-direction: column;
            }
            
            .sidebar {
                width: 100%;
                height: auto;
                max-height: 200px;
            }
            
            .message-content {
                max-width: 85%;
            }
        }