:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
        }
       
        .viewer-container {
            position: relative;
            width: 100%;
            height: 500px;
            background-color: #f8f9fa;
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }
        
        #moleculeViewer {
            width: 100%;
            height: 100%;
        }
        
        .viewer-controls {
            position: absolute;
            top: 10px;
            right: 10px;
            display: flex;
            flex-direction: column;
            gap: 5px;
            z-index: 10;
        }
        
        .viewer-controls button {
            background-color: rgba(255, 255, 255, 0.9);
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 8px;
            cursor: pointer;
            transition: all 0.3s;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .viewer-controls button:hover {
            background-color: white;
            transform: scale(1.1);
        }
        
        .visualization-modes {
            display: flex;
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 4px;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .mode-btn {
            flex: 1;
            text-align: center;
            padding: 0.75rem;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
            min-width: 120px;
            margin: 2px;
            border: none;
            background: transparent;
        }
        
        .mode-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .atom-legend {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 1rem;
            padding: 1rem;
            background-color: var(--light-gray);
            border-radius: 6px;
        }
        
        .atom-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .atom-color {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            border: 1px solid #ddd;
        }
        
        .loading-indicator {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: rgba(255, 255, 255, 0.9);
            padding: 1rem 2rem;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
            z-index: 5;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
    
        .input-tabs {
            display: flex;
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 4px;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }
        
        .input-tab {
            flex: 1;
            text-align: center;
            padding: 0.75rem;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
            min-width: 120px;
            margin: 2px;
            border: none;
            background: transparent;
        }
        
        .input-tab.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .input-section {
            display: none;
        }
        
        .input-section.active {
            display: block;
        }
        
        .example-box {
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 1rem;
            margin-top: 1rem;
            border-left: 4px solid var(--primary-color);
        }
        
        .example-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .example-code {
            background-color: white;
            padding: 0.75rem;
            border-radius: 4px;
            font-family: monospace;
            font-size: 0.85rem;
            overflow-x: auto;
            border: 1px solid var(--border-color);
        }
        
        .format-hint {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }