: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;
        }
         
        .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 0.2);
            position: relative;
            overflow: hidden;
color: var(--text-color);
        }
        
         
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        
        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
        }
        
        .breadcrumb-item.active {
            color: var(--text-color);
        }
         
        .summary-card {
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .summary-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .summary-label {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* Chart Container */
        .chart-container {
            position: relative;
            height: 400px;
            width: 100%;
            margin: 2rem 0;
        }
        
        /* Financial Summary */
        .financial-summary {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        
        .financial-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);
        }
        
        .financial-item h4 {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
        }
        
        .financial-item .value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .financial-item .detail {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }
         
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .tool-card {
                padding: 1.5rem;
            }
            
            .financial-summary {
                grid-template-columns: 1fr;
            }
        }
        
        /* Toggle switch for calculation modes */
        .calculation-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;
        }
        
        .mode-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
         
        /* Range slider styling */
        .form-range {
            width: 100%;
            height: 1rem;
            padding: 0;
            background-color: transparent;
            -webkit-appearance: none;
        }
        
        .form-range:focus {
            outline: none;
        }
        
        .form-range::-webkit-slider-thumb {
            width: 1rem;
            height: 1rem;
            margin-top: -0.5rem;
            background-color: var(--primary-color);
            border: 0;
            border-radius: 1rem;
            -webkit-appearance: none;
        }
        
        .form-range::-webkit-slider-runnable-track {
            width: 100%;
            height: 0.5rem;
            cursor: pointer;
            animate: 0.2s;
            background: var(--light-gray);
            border-radius: 0.5rem;
        }
        
        .slider-value {
            background-color: var(--primary-color);
            color: white;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-left: 0.5rem;
        }
        
        /* Input group styling */
        .input-group {
            margin-bottom: 1rem;
        }
        
        /* Mode-specific form styling */
        .mode-form {
            display: none;
        }
        
        .mode-form.active {
            display: block;
        }
        
        /* Comparison table */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .comparison-table th, .comparison-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .comparison-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .comparison-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        /* Reaction input styling */
        .half-cell {
            background-color: var(--light-gray);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }
        
        .half-cell-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .reaction-input {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }
        
        .reaction-compound {
            display: flex;
            align-items: center;
            margin: 0.5rem;
        }
        
        .coefficient-input {
            width: 60px;
            margin-right: 0.5rem;
        }
        
        .compound-select {
            min-width: 150px;
        }
        
        .phase-badge {
            margin-left: 0.5rem;
            font-size: 0.8rem;
            background-color: var(--light-gray);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
        }
        
        .generating-indicator {
            display: none;
            text-align: center;
            padding: 1rem;
            font-weight: 600;
            color: var(--primary-color);
        }
        
        /* Electrochemical property badges */
        .property-badge {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
            margin: 0.25rem;
        }
        
        .potential-badge {
            background-color: rgba(255, 99, 132, 0.1);
            color: #ff6384;
        }
        
        .concentration-badge {
            background-color: rgba(54, 162, 235, 0.1);
            color: #36a2eb;
        }
        
        .temperature-badge {
            background-color: rgba(75, 192, 192, 0.1);
            color: #4bc0c0;
        }
        
        /* Cell diagram */
        .cell-diagram {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            margin: 1.5rem 0;
            text-align: center;
        }
        
        .cell-components {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin: 1rem 0;
        }
        
        .anode, .cathode {
            flex: 1;
            padding: 1rem;
            border-radius: 6px;
            background-color: var(--light-gray);
        }
        
        .salt-bridge {
            width: 60px;
            height: 100px;
            background: linear-gradient(to bottom, #a9d6e5, #2c7da0);
            border-radius: 30px;
            margin: 0 1rem;
            position: relative;
        }
        
        .salt-bridge::before {
            content: "";
            position: absolute;
            top: 10px;
            left: 10px;
            right: 10px;
            bottom: 10px;
            background-color: white;
            border-radius: 20px;
        }
        
        .wire {
            height: 4px;
            background-color: #ffc107;
            margin: 0.5rem 0;
            position: relative;
        }
        
        .wire::after {
            content: "e⁻";
            position: absolute;
            top: -20px;
            right: 10px;
            background-color: #ffc107;
            color: white;
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 0.8rem;
        }
        
        /* Balance validation */
        .balance-alert {
            background-color: rgba(255, 193, 7, 0.1);
            border: 1px solid rgba(255, 193, 7, 0.3);
            border-radius: 6px;
            padding: 0.75rem;
            margin-bottom: 1rem;
        }
        
        .balance-success {
            background-color: rgba(40, 167, 69, 0.1);
            border: 1px solid rgba(40, 167, 69, 0.3);
            border-radius: 6px;
            padding: 0.75rem;
            margin-bottom: 1rem;
        }
        
        /* Preset cells */
        .preset-cell {
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 1rem;
            margin-bottom: 1rem;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .preset-cell:hover {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .preset-cell.active {
            border-color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .preset-name {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .preset-reaction {
            font-size: 0.9rem;
            color: var(--text-muted);
        }