body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            padding: 0;
            color: #333;
            background-color: #f5f5f5;
        } 
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        h1, h2, h3 {
            color: #2c3e50;
        }
        
        .header {
            background-color: #34495e;
            color: white;
            padding: 20px;
            text-align: center;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .controls {
            display: flex;
            justify-content: space-between;
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 10px;
            background-color: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .graph-container {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .visualization {
            flex: 2;
            min-width: 600px;
            height: 500px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            overflow: hidden;
        }
        
        .info-panel {
            flex: 1;
            min-width: 300px;
            background-color: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            max-height: 500px;
            overflow-y: auto;
        }
        
        .tabs {
            display: flex;
            border-bottom: 1px solid #ddd;
            margin-bottom: 15px;
        }
        
        .tab {
            padding: 10px 15px;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 16px;
            font-weight: 500;
            color: #555;
        }
        
        .tab.active {
            border-bottom: 3px solid #3498db;
            color: #3498db;
        }
        
        button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            transition: background-color 0.3s;
        }
        
        button:hover {
            background-color: #2980b9;
        }
        
        select, input {
            padding: 8px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
        }
        
        .control-group {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .slider-container {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .code-block {
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: 4px;
            overflow-x: auto;
            font-family: monospace;
            margin-bottom: 15px;
        }
        
        .node {
            stroke: #fff;
            stroke-width: 1.5px;
            cursor: pointer;
        }
        
        .link {
            stroke-opacity: 0.6;
        }
        
        .directed-arrow {
            fill: #666;
        }
        
        .status-message {
            padding: 10px;
            margin-top: 10px;
            background-color: #e8f4fc;
            border-left: 4px solid #3498db;
            border-radius: 4px;
        }
        
        .concept-list {
            list-style-type: none;
            padding: 0;
            margin: 0;
        }
        
        .concept-item {
            padding: 10px;
            margin-bottom: 5px;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.2s;
        }
        
        .concept-item:hover {
            background-color: #f0f0f0;
        }
        
        .concept-item.active {
            background-color: #e8f4fc;
            border-left: 4px solid #3498db;
        }
        
        .step-buttons {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }
        
        .algorithm-controls {
            display: flex;
            gap: 10px;
            margin-top: 10px;
            flex-wrap: wrap;
        }
        
        .tooltip {
            position: absolute;
            background-color: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 12px;
            pointer-events: none;
            z-index: 10;
        }
        
        .legend {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 10px;
        }
        
        .legend-item {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: 12px;
        }
        
        .legend-color {
            width: 15px;
            height: 15px;
            border-radius: 3px;
        }
        
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 100;
            justify-content: center;
            align-items: center;
        }
        
        .modal-content {
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            max-width: 600px;
            width: 90%;
            max-height: 80vh;
            overflow-y: auto;
        }
        
        .close-button {
            float: right;
            cursor: pointer;
            font-size: 20px;
            color: #555;
        }
        
        @media (max-width: 768px) {
            .visualization {
                min-width: 100%;
                height: 400px;
            }
            
            .info-panel {
                min-width: 100%;
            }
        }