:root {
            --primary-color: #2c7da0;
            --secondary-color: #a9d6e5;
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --header-bg: #f0f4f8;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
            --match-color: #d4edda;
            --match-border: #c3e6cb;
            --group-1: #d1ecf1;
            --group-2: #f8d7da;
            --group-3: #fff3cd;
            --group-4: #e2e3e5;
            --group-5: #cce5ff;
        }
        
   
        /* Form Styles */
        .form-label {
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--text-color);
            font-size: 1.05rem;
        }
        
        .form-control {
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 1rem;
            transition: all 0.3s;
            font-size: 1rem;
            height: auto;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 4px rgba(44, 125, 160, 0.15);
        }
        
        .form-text {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 0.5rem;
        }
        
       
        
        /* Result Area */
        .result-container {
            background-color: var(--light-gray);
            border-radius: 8px;
            padding: 2rem;
            margin-top: 2rem;
            position: relative;
            border: 1px solid var(--border-color);
        }
        
        .result-title {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--primary-color);
            font-size: 1.3rem;
        }
        
        /* Test Area */
        .test-area {
            background-color: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            margin-top: 1.5rem;
            font-family: 'Courier New', monospace;
            font-size: 1.05rem;
            line-height: 1.6;
            white-space: pre-wrap;
            overflow-x: auto;
        }
        
        .match {
            background-color: var(--match-color);
            border: 1px solid var(--match-border);
            border-radius: 3px;
            padding: 0 2px;
            margin: -1px;
        }
        
        .group-1 { background-color: var(--group-1); }
        .group-2 { background-color: var(--group-2); }
        .group-3 { background-color: var(--group-3); }
        .group-4 { background-color: var(--group-4); }
        .group-5 { background-color: var(--group-5); }
        
        .match-info {
            display: inline-block;
            font-size: 0.8rem;
            background-color: rgba(0,0,0,0.05);
            border-radius: 3px;
            padding: 0 4px;
            margin-left: 5px;
            vertical-align: super;
        }
        
        /* Flags Selector */
        .flags-selector {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            margin: 1rem 0;
        }
        
        .flag-checkbox {
            display: none;
        }
        
        .flag-label {
            padding: 0.75rem 1.25rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 0.95rem;
        }
        
        .flag-checkbox:checked + .flag-label {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        /* Matches Summary */
        .matches-summary {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .summary-card {
            flex: 1;
            min-width: 200px;
            padding: 1.25rem;
            border-radius: 8px;
            background-color: white;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
        }
        
        .summary-title {
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--primary-color);
        }
        
        .summary-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent-color);
        }
        
        /* Matches Table */
        .matches-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 1.5rem;
        }
        
        .matches-table th {
            background-color: var(--light-gray);
            text-align: left;
            padding: 0.75rem;
            font-weight: 600;
            border-bottom: 1px solid var(--border-color);
        }
        
        .matches-table td {
            padding: 0.75rem;
            border-bottom: 1px solid var(--border-color);
        }
        
        .matches-table tr:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .match-index {
            font-weight: 600;
            color: var(--primary-color);
        }
        
        /* Layout Optimization */
        .main-content {
            display: flex;
            gap: 2rem;
        }
        
        .tool-column {
            flex: 0 0 70%;
            max-width: 70%;
        }
        
        .sidebar-column {
            flex: 0 0 30%;
            max-width: 30%;
        }
        
        @media (max-width: 991px) {
            .main-content {
                flex-direction: column;
            }
            
            .tool-column,
            .sidebar-column {
                flex: 0 0 100%;
                max-width: 100%;
            }
        }
        
        /* Tool Input Area */
        .tool-input-area {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        
        .input-group {
            margin-bottom: 1.5rem;
        }
        
        .action-buttons-row {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        
        /* Regex Examples */
        .regex-examples {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-top: 2rem;
        }
        
        .regex-card {
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s;
            cursor: pointer;
        }
        
        .regex-card:hover {
            transform: translateY(-5px);
        }
        
        .regex-title {
            font-weight: 700;
            margin-bottom: 0.75rem;
            color: var(--primary-color);
            font-size: 1.25rem;
        }
        
        .regex-desc {
            color: var(--text-muted);
            font-size: 1rem;
            margin-bottom: 1rem;
        }
        
        .regex-pattern {
            font-family: 'Courier New', monospace;
            font-size: 0.95rem;
            background-color: #f8f9fa;
            padding: 1rem;
            border-radius: 6px;
            line-height: 1.6;
        }
        
        /* Spacing adjustments */
        .mb-5 {
            margin-bottom: 3rem !important;
        }
        
        .mb-4 {
            margin-bottom: 2.5rem !important;
        }
        
        .mb-3 {
            margin-bottom: 2rem !important;
        }
        
        .mt-4 {
            margin-top: 2.5rem !important;
        }
        
        .mt-5 {
            margin-top: 3rem !important;
        }
        
        .py-4 {
            padding-top: 2.5rem !important;
            padding-bottom: 2.5rem !important;
        }
        
        .py-3 {
            padding-top: 2rem !important;
            padding-bottom: 2rem !important;
        }
        
        /* Regex Visualization */
        .regex-visualization {
            background-color: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            margin-top: 1.5rem;
            font-family: 'Courier New', monospace;
            font-size: 1.05rem;
            line-height: 1.6;
            white-space: pre-wrap;
        }
        
        .regex-node {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            margin: 0.1rem;
            border-radius: 4px;
            border: 1px solid #ddd;
            background-color: #f8f9fa;
        }
        
        .regex-node-group {
            background-color: #e9ecef;
            padding: 0.25rem;
            border-radius: 4px;
            display: inline-block;
            margin: 0.1rem;
        }
        
        .regex-node-quantifier {
            background-color: #d1ecf1;
            color: #0c5460;
            font-weight: bold;
        }
        
        .regex-node-character {
            background-color: #d4edda;
            color: #155724;
        }
        
        .regex-node-anchor {
            background-color: #fff3cd;
            color: #856404;
        }
        
        .regex-node-escape {
            background-color: #f8d7da;
            color: #721c24;
        }
        
        /* Performance Analysis */
        .performance-analysis {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        
        .perf-card {
            background-color: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 1.25rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        
        .perf-title {
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--primary-color);
        }
        
        .perf-value {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--accent-color);
        }
        
        .perf-description {
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-top: 0.5rem;
        }
        
        /* New styles for missing elements */
        .action-btn {
            background-color: transparent;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 0.5rem 1rem;
            color: var(--text-muted);
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .action-btn:hover {
            background-color: rgba(44, 125, 160, 0.1);
            color: var(--primary-color);
        }
        
        .section-title {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border-color);
        }
        
        .component-card {
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }
        
        .component-title {
            display: flex;
            align-items: center;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .component-title i {
            margin-right: 0.75rem;
            font-size: 1.25rem;
        }
        
        .code-example {
            font-family: 'Courier New', monospace;
            background-color: #f8f9fa;
            padding: 1rem;
            border-radius: 6px;
            margin-top: 1rem;
            font-size: 0.95rem;
        }
        
        .related-tool {
            display: flex;
            align-items: center;
            padding: 1rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        
        .related-tool:last-child {
            border-bottom: none;
        }
        
        .related-icon {
            width: 40px;
            height: 40px;
            background-color: rgba(44, 125, 160, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--primary-color);
        }
        
        .related-name {
            font-weight: 600;
            color: var(--text-color);
        }
        
        .related-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .ad-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            text-transform: uppercase;
            margin-bottom: 0.5rem;
        }
        
        .ad-placeholder {
            background-color: #f8f9fa;
            border: 1px dashed var(--border-color);
            border-radius: 8px;
            padding: 3rem 1rem;
            text-align: center;
            color: var(--text-muted);
        }
        
        .footer {
            background-color: var(--light-gray);
            padding: 3rem 0;
            margin-top: 3rem;
        }
        
        .social-icons {
            margin-top: 1rem;
        }
        
        .social-icon {
            display: inline-block;
            width: 36px;
            height: 36px;
            background-color: white;
            border-radius: 50%;
            text-align: center;
            line-height: 36px;
            margin-right: 0.5rem;
            color: var(--primary-color);
            transition: all 0.3s;
        }
        
        .social-icon:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        .info-box {
            background-color: #e7f4f8;
            border-left: 4px solid var(--primary-color);
            padding: 1rem 1.5rem;
            border-radius: 4px;
        }
        
        /* Toast notifications */
        .toast-container {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 1050;
        }
        
        .toast {
            background-color: white;
            border-radius: 8px;
            padding: 1rem 1.5rem;
            margin-bottom: 1rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            opacity: 0;
            transform: translateY(10px);
            transition: all 0.3s;
        }
        
        .toast.show {
            opacity: 1;
            transform: translateY(0);
        }
        
        .toast-icon {
            margin-right: 0.75rem;
            font-size: 1.25rem;
        }
        
        .toast-success .toast-icon {
            color: var(--success-color);
        }
        
        .toast-error .toast-icon {
            color: var(--danger-color);
        }
        
        .toast-info .toast-icon {
            color: var(--primary-color);
        }
        
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .tool-card {
                padding: 1.5rem;
            }
            
            .form-control {
                padding: 0.9rem;
            }
            
            .btn-primary, .btn-outline-secondary {
                padding: 0.9rem 1.5rem;
            }
            
            .regex-examples {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 576px) {
            .tool-card {
                padding: 1.25rem;
            }
            
            .action-buttons-row {
                flex-direction: column;
            }
        }