: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;
            --danger-color: #dc3545;
        }
        .comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}.comparison-table th {
    background-color: var(--light-gray);
    font-weight: 600;
}
.comparison-table th, .comparison-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
        
        /* Tab Navigation */
        .tab-navigation {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .tab-btn {
            padding: 0.75rem 1.5rem;
            background: none;
            border: none;
            border-bottom: 3px solid transparent;
            font-weight: 600;
            color: var(--text-muted);
            cursor: pointer;
            transition: all 0.3s;
            white-space: nowrap;
        }
        
        .tab-btn:hover {
            color: var(--primary-color);
        }
        
        .tab-btn.active {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        /* Form Styles */
        .form-label {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-color);
        }
        
        .form-control {
            border: 1px solid #ddd;
            border-radius: 6px;
            padding: 0.75rem;
            transition: all 0.3s;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(44, 125, 160, 0.15);
        }
        
        .input-group-text {
            background-color: var(--light-gray);
            border: 1px solid #ddd;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            font-weight: 600;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        
        .btn-primary:hover {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            transform: translateY(-1px);
        }
        
        .btn-outline-secondary {
            font-weight: 600;
            border-radius: 6px;
            padding: 0.75rem 1.5rem;
        }
        
        /* Result Area */
        .result-container {
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 1.5rem;
            margin-top: 1.5rem;
            position: relative;
            border: 1px solid var(--border-color);
        }
        
        .result-title {
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--primary-color);
        }
        
        .result-content {
            word-break: break-all;
            padding: 12px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 0.95rem;
            line-height: 1.8;
        }
        
        .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;
        }
        
        /* Material Database */
        .material-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .material-table th, .material-table td {
            border: 1px solid var(--border-color);
            padding: 0.75rem;
        }
        
        .material-table th {
            background-color: rgba(44, 125, 160, 0.1);
            font-weight: 600;
        }
        
        .material-table tr:nth-child(even) {
            background-color: var(--light-gray);
        }
        
        .material-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        /* Chart Container */
        .chart-container {
            width: 100%;
            height: 300px;
            margin: 1.5rem 0;
        }
        
        /* Safety Factor Indicator */
        .safety-indicator {
            height: 10px;
            background-color: var(--light-gray);
            border-radius: 5px;
            margin: 1rem 0;
            overflow: hidden;
        }
        
        .safety-level {
            height: 100%;
            border-radius: 5px;
            transition: width 0.5s;
        }
        
        .safety-low {
            background-color: var(--danger-color);
        }
        
        .safety-medium {
            background-color: var(--warning-color);
        }
        
        .safety-high {
            background-color: var(--success-color);
        }
        
        /* Section Titles */
        .section-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        
        /* Info Boxes */
        .info-box {
            background-color: rgba(44, 125, 160, 0.05);
            border-left: 3px solid var(--primary-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        
        /* Footer */
        .footer {
            background-color: var(--light-gray);
            padding: 2rem 0;
            margin-top: 3rem;
            border-top: 1px solid var(--border-color);
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .tab-navigation {
                flex-direction: column;
            }
            
            .tab-btn {
                border-bottom: 1px solid var(--border-color);
                border-left: 3px solid transparent;
            }
            
            .tab-btn.active {
                border-left-color: var(--primary-color);
                border-bottom-color: var(--border-color);
            }
        }