:root { 
            --accent-color: #155724;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
            --info-color: #17a2b8;
        }
        .page-header {
            background: linear-gradient(135deg, rgba(195, 230, 203, 0.4) 0%, rgba(40, 167, 69, 0.4) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(40, 167, 69, 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);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.15);
        }
        .result-box {
            padding: 12px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 1.1rem;
            margin: 10px 0;
            text-align: center;
        }
        .calculation-step {
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px dashed var(--border-color);
        }
        .step-content {
            padding-left: 1.5rem;
        }
        .step-equation {
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            background-color: rgba(40, 167, 69, 0.05);
            padding: 10px;
            border-radius: 4px;
            border-left: 3px solid var(--primary-color);
            margin: 10px 0;
        }
        .accuracy-indicator {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.85rem;
            margin-left: 10px;
        }
        .accuracy-high {
            background-color: rgba(40, 167, 69, 0.2);
            color: var(--accent-color);
        }
        .accuracy-medium {
            background-color: rgba(255, 193, 7, 0.2);
            color: #856404;
        }
        .accuracy-low {
            background-color: rgba(220, 53, 69, 0.2);
            color: #721c24;
        }
        .formula-box {
            background-color: rgba(23, 162, 184, 0.05);
            border-left: 3px solid var(--info-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            }
        .example-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-btn {
            background-color: rgba(40, 167, 69, 0.1);
            border: 1px solid rgba(40, 167, 69, 0.2);
            border-radius: 4px;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            color: var(--primary-color);
            cursor: pointer;
            transition: all 0.2s;
        }
        .example-btn:hover {
            background-color: rgba(40, 167, 69, 0.2);
            transform: translateY(-2px);
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .comparison-table th, .comparison-table td {
            padding: 0.75rem;
            text-align: center;
            border: 1px solid var(--border-color);
        }
        .comparison-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .comparison-table tr:nth-child(even) {
            background-color: rgba(40, 167, 69, 0.05);
        }
        .accuracy-scale {
            width: 100%;
            height: 30px;
            background: linear-gradient(to right, #28a745, #ffc107, #dc3545);
            border-radius: 4px;
            margin: 1rem 0;
            position: relative;
        }
        .accuracy-marker {
            position: absolute;
            top: 35px;
            transform: translateX(-50%);
            font-size: 0.8rem;
        }
        .value-visualization {
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 1rem 0;
        }
        .value-bar {
            height: 40px;
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
            margin: 0 5px;
        }
        .experimental-value {
            background-color: var(--primary-color);
        }
        .theoretical-value {
            background-color: var(--info-color);
        }
        .value-label {
            font-size: 0.8rem;
            margin-top: 5px;
            text-align: center;
        }
        .tool-switcher {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
        }
        .tool-tab {
            padding: 0.75rem 1.5rem;
            background: none;
            border: none;
            border-bottom: 3px solid transparent;
            font-weight: 600;
            color: var(--text-muted);
            transition: all 0.3s;
        }
        .tool-tab.active {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
        }
        .tool-tab:hover:not(.active) {
            color: var(--primary-color);
            background-color: rgba(40, 167, 69, 0.05);
        }
        .error-message {
            color: var(--danger-color);
            font-weight: 600;
            padding: 10px;
            background-color: rgba(220, 53, 69, 0.1);
            border-radius: 4px;
            margin: 10px 0;
            text-align: center;
        }