:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --header-bg: #f0f4f8;
            --metal-color: #6c757d;
            --ionic-color: #28a745;
            --molecular-color: #17a2b8;
            --covalent-color: #ffc107;
        }
         
        .coordination-result {
            text-align: center;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            background-color: #f8f9fa;
            border: 1px solid #eaeaea;
        }
        
        .coordination-value {
            font-size: 3.5rem;
            font-weight: 700;
            margin: 0.5rem 0;
            color: var(--primary-color);
        }
        
        .coordination-label {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--text-muted);
        }
          .info-section{overflow:auto}
        .structure-options {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(145px, 1fr));
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        
        .structure-card {
            padding: 1.5rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            background: white;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .structure-card:hover {
            border-color: var(--primary-color);
        }
        
        .structure-card.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .structure-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .structure-name {
            font-weight: 500;
        }
        
        .structure-desc {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        .visualization-container {
            height: 300px;
            background-color: var(--light-gray);
            border-radius: 8px;
            margin: 1.5rem 0;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }
        
        .atom {
            position: absolute;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 0.8rem;
        }
        
        .central-atom {
            background-color: var(--primary-color);
            width: 60px;
            height: 60px;
            z-index: 10;
        }
        
        .neighbor-atom {
            background-color: var(--accent-color);
            width: 40px;
            height: 40px;
        }
        
        .bond {
            position: absolute;
            background-color: rgba(0, 0, 0, 0.3);
            transform-origin: 0 0;
        }
        
        .info-section {
            background-color: rgba(44, 125, 160, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-left: 3px solid var(--primary-color);
        }
        
        .info-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .feature-card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .feature-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .feature-desc {
            color: var(--text-muted);
        }
        
        .faq-section {
            background-color: rgba(44, 125, 160, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-left: 3px solid var(--primary-color);
        }
        
        .faq-item {
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        
        .faq-item:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .faq-question {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--accent-color);
            display: flex;
            align-items: center;
        }
        
        .faq-question i {
            margin-right: 0.75rem;
            color: var(--primary-color);
        }
        
        .faq-answer {
            color: var(--text-muted);
            padding-left: 2rem;
        }
        
        .related-tools {
            background-color: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }
         
        
        .structure-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .structure-table th, .structure-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .structure-table th {
            background-color: rgba(44, 125, 160, 0.1);
            font-weight: 600;
        }
        
        .structure-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .examples-section {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-color);
        }
        
        @media (max-width: 768px) {
            .structure-options {
                grid-template-columns: 1fr;
            }
            
            .structure-card {
                min-width: 100%;
            }
        }