: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;
        }
       
        .thermodynamic-summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .thermodynamic-item {
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .thermodynamic-item h4 {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        
        .thermodynamic-item .value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .thermodynamic-item .detail {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }
        
        .chart-container {
            position: relative;
            height: 400px;
            width: 100%;
            margin: 2rem 0;
        }
        
        .system-types {
            display: flex;
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 4px;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .type-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;
        }
        
        .type-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .type-form {
            display: none;
        }
        
        .type-form.active {
            display: block;
        }
         
        .alert-danger {
            display: none;
            margin-top: 1rem;
        }
         
        .constants-display {
            background-color: white;
            border-radius: 8px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            margin: 1rem 0;
        }
        
        .constants-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .constants-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 0.5rem;
        }
        
        .constant-item {
            display: flex;
            justify-content: space-between;
            padding: 0.25rem 0;
        }
        
        .constant-name {
            font-weight: 500;
        }
        
        .constant-value {
            color: var(--text-muted);
            font-family: monospace;
        }
 
        @media (max-width: 768px) { 
            .thermodynamic-summary {
                grid-template-columns: 1fr;
            }
        }