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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #333;
            line-height: 1.6;
        }

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

        .header {
            text-align: center;
            margin-bottom: 40px;
            background: rgba(255, 255, 255, 0.95);
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .header h1 {
            font-size: 3em;
            color: #2c3e50;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
        }

        .header p {
            font-size: 1.2em;
            color: #7f8c8d;
            margin-bottom: 20px;
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .category-card {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            padding: 25px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }

        .category-title {
            font-size: 1.8em;
            color: #2c3e50;
            margin-bottom: 20px;
            text-align: center;
            border-bottom: 3px solid #3498db;
            padding-bottom: 10px;
        }

        .term-grid {
            display: grid;
            gap: 15px;
        }

        .term-item {
            background: #f8f9fa;
            padding: 15px;
            border-radius: 10px;
            border-left: 4px solid #3498db;
            transition: all 0.3s ease;
        }

        .term-item:hover {
            background: #e3f2fd;
            transform: translateX(5px);
        }

        .term-name {
            font-weight: bold;
            color: #2c3e50;
            font-size: 1.1em;
            margin-bottom: 8px;
        }

        .term-definition {
            color: #555;
            font-size: 0.9em;
            line-height: 1.5;
        }

        .term-importance {
            color: #7f8c8d;
            font-size: 0.85em;
            margin-top: 8px;
            font-style: italic;
        }

        .footer {
            text-align: center;
            margin-top: 40px;
            padding: 30px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
        }

        .citation {
            font-size: 0.9em;
            color: #7f8c8d;
            margin-bottom: 10px;
        }

        .stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .stat-item {
            text-align: center;
            background: #3498db;
            color: white;
            padding: 15px 25px;
            border-radius: 50px;
            font-weight: bold;
        }

        .stat-number {
            font-size: 2em;
            display: block;
        }

        .stat-label {
            font-size: 0.9em;
            opacity: 0.9;
        }

        .legend {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.9);
            padding: 10px 15px;
            border-radius: 25px;
            font-size: 0.9em;
        }

        .legend-color {
            width: 20px;
            height: 20px;
            border-radius: 50%;
        }

        .color-fundamentals { background: #e74c3c; }
        .color-ml { background: #3498db; }
        .color-neural { background: #9b59b6; }
        .color-applied { background: #27ae60; }
        .color-ethics { background: #f39c12; }
        .color-advanced { background: #34495e; }

        .fundamentals { border-left-color: #e74c3c; }
        .ml { border-left-color: #3498db; }
        .neural { border-left-color: #9b59b6; }
        .applied { border-left-color: #27ae60; }
        .ethics { border-left-color: #f39c12; }
        .advanced { border-left-color: #34495e; }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2.5em;
            }
            
            .category-grid {
                grid-template-columns: 1fr;
            }
            
            .stats {
                flex-direction: column;
                gap: 20px;
            }
            
            .legend {
                flex-direction: column;
                align-items: center;
            }
        }