: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;
            --arithmetic-color: #4e73df;
            --geometric-color: #1cc88a;
            --power-color: #f6c23e;
            --taylor-color: #e74a3b;
            --fourier-color: #6f42c1;
            --step-color: #6f42c1;
            --keyboard-bg: #f8f9fa;
            --keyboard-btn: #e9ecef;
            --keyboard-hover: #d8e2dc;
        }
         
        .page-header {
            background: linear-gradient(135deg, rgba(111, 66, 193, 0.1) 0%, rgba(44, 125, 160, 0.1) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 0.2);
            position: relative;
            overflow: hidden;color:black
        }
        
 
        
        .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);
        }
         
        /* Series Specific Styles */
        .input-row {
            display: grid;
            grid-template-columns: 1fr;
            gap: 0.75rem;
            margin-bottom: 1rem;
        }
        
        .result-container {
            margin-top: 2rem;
            padding: 1.5rem;
            border-radius: 8px;
            background-color: var(--light-gray);
            border-left: 4px solid var(--arithmetic-color);
        }
        
        .result-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--arithmetic-color);
        }
        
        .result-content {
            font-family: 'Courier New', monospace;
            font-size: 1.25rem;
            overflow-x: auto;
            padding: 1rem;
            background-color: white;
            border-radius: 6px;
        }
        
        .graph-container {
            height: 400px;
            background-color: var(--light-gray);
            border-radius: 8px;
            border: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
            margin-top: 2rem;
        }
        
        .graph-canvas {
            width: 100%;
            height: 100%;
        }
        
        .step-container {
            margin-top: 2rem;
        }
        
        .step-title {
            font-weight: 600;
            color: var(--step-color);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--step-color);
        }
        
        .step {
            margin-bottom: 1.5rem;
            padding: 1rem;
            background-color: var(--light-gray);
            border-radius: 8px;
            border-left: 4px solid var(--step-color);
        }
        
        .steps-number {
            font-weight: 600;
            color: var(--step-color);
            margin-right: 0.5rem;
        }
        
        .step-content {
            font-family: 'Courier New', monospace; 
            margin-bottom: 0.5rem;
        }
        
        .step-explanation {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        .rules-card {
            background-color: rgba(78, 115, 223, 0.1);
            border-left: 4px solid var(--function-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin-top: 2rem;
        }
        
        .rules-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--function-color);
        }
        
        .examples-card {
            background-color: rgba(231, 74, 59, 0.1);
            border-left: 4px solid var(--taylor-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin-top: 2rem;
        }
        
        .examples-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--taylor-color);
        }
        
        .example-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 1.5rem;
        }
        
        .example-table th, 
        .example-table td {
            padding: 0.75rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        
        .example-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .example-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .application-card {
            background-color: rgba(28, 200, 138, 0.1);
            border-left: 4px solid var(--step-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin-top: 2rem;
        }
        
        .application-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--step-color);
        }
        
        /* Math Keyboard Styles */
        .math-keyboard {
            background-color: var(--keyboard-bg);
            border-radius: 8px;
            padding: 1rem;
            margin-top: 1rem;
            border: 1px solid var(--border-color);
        }
        
        .keyboard-row {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 0.5rem;
        }
        
        .math-btn {
            background-color: var(--keyboard-btn);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 0.5rem 0.75rem;
            min-width: 50px;
            font-family: 'Courier New', monospace;
            font-weight: 600;
            transition: all 0.2s;
        }
        
        .math-btn:hover {
            background-color: var(--keyboard-hover);
            transform: translateY(-2px);
        }
        
        .math-btn.special {
            background-color: var(--primary-color);
            color: white;
        }
        
        .math-btn.special:hover {
            background-color: var(--accent-color);
        }
         
        /* Error message styles */
        .error-message {
            color: var(--danger-color);
            background-color: rgba(220, 53, 69, 0.1);
            padding: 0.75rem;
            border-radius: 6px;
            border-left: 4px solid var(--danger-color);
            margin-top: 1rem;
        }
        
        .convergence-info {
            color: var(--success-color);
            background-color: rgba(40, 167, 69, 0.1);
            padding: 0.75rem;
            border-radius: 6px;
            border-left: 4px solid var(--success-color);
            margin-top: 1rem;
        }
        
        @media (min-width: 768px) {
            .input-row {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
        }