:root {
 
            --accent-color: #2c3e50;
            --light-gray: #f8f9fa;
            --dark-bg: #1a1a2e;
            --success-color: #2ecc71;
            --warning-color: #f39c12;
            --danger-color: #e74c3c;
            --prime-blue: #3498db;
            --prime-green: #2ecc71;
            --prime-purple: #9b59b6;
            --text-color: #333;
            --text-muted: #6c757d;
        }
        .breadcrumb-item a,.breadcrumb-item.active{color:black}
        .page-header {
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid #ddd;
            background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(41, 128, 185, 0.1) 100%);color:black
        }
         
        
        /* Search and Filter */
        .search-container {
            display: flex;
            gap: 15px;
            margin-bottom: 1.5rem;
        }
        
        .search-box {
            flex: 1;
            position: relative;
        }
        
        .search-box i {
            position: absolute;
            left: 40px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
        }
        
        .search-box input {
            padding-left: 45px;
        }
        
        .category-filter {
            width: 200px;
        }
        
        /* Constants Table */
        .constants-table {
            width: 100%;
            border-collapse: collapse;
        }
        
        .constants-table th {
            background-color: rgba(52, 152, 219, 0.1);
            color: var(--primary-color);
            font-weight: 600;
            padding: 0.75rem;
            text-align: left;
            border-bottom: 2px solid #ddd;
            cursor: pointer;
            position: relative;
        }
        
        .constants-table th:hover {
            background-color: rgba(52, 152, 219, 0.2);
        }
        
        .constants-table th.sorted::after {
            content: '\f0d7';
            font-family: 'Font Awesome 5 Free';
            font-weight: 900;
            position: absolute;
            right: 10px;
        }
        
        .constants-table th.sorted.desc::after {
            content: '\f0d8';
        }
        
        .constants-table td {
            padding: 0.75rem;
            border-bottom: 1px solid #eee;
        }
        
        .constants-table tr:hover {
            background-color: rgba(0, 0, 0, 0.02);
        }
        
        .constant-symbol {
            font-weight: 600;
            color: var(--primary-color);
        }
        
        .constant-value {
            font-family: monospace;
        }
        
        .constant-category {
            display: inline-block;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 500;
        }
        
        .category-math {
            background-color: rgba(52, 152, 219, 0.1);
            color: var(--primary-color);
        }
        
        .category-physics {
            background-color: rgba(231, 76, 60, 0.1);
            color: var(--danger-color);
        }
        
        .category-chemistry {
            background-color: rgba(46, 204, 113, 0.1);
            color: var(--prime-green);
        }
        
        .category-universal {
            background-color: rgba(155, 89, 182, 0.1);
            color: var(--prime-purple);
        }
        
        .category-astronomy {
            background-color: rgba(243, 156, 18, 0.1);
            color: var(--warning-color);
        }
        
        /* Constant Detail */
        .constant-detail {
            background-color: white;
            border-radius: 8px;
            border: 1px solid #ddd;
            padding: 1.5rem;
            margin-top: 1.5rem;
            display: none;
        }
        
        .constant-detail-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
        }
        
        .constant-detail-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--primary-color);
        }
        
        .constant-detail-body {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }
        
        .constant-detail-value {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0.5rem 0;
        }
        
        .constant-detail-description {
            line-height: 1.8;
        }
        
        .constant-detail-history {
            font-style: italic;
            border-left: 3px solid var(--primary-color);
            padding-left: 1rem;
            margin: 1rem 0;
        }
        
        .constant-detail-applications {
            margin-top: 1rem;
        }
        
        .constant-detail-applications ul {
            padding-left: 1.5rem;
        }
        
        .constant-detail-applications li {
            margin-bottom: 0.5rem;
        }
        
        /* Related Constants */
        .related-constants {
            margin-top: 1.5rem;
        }
        
        .related-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #ddd;
        }
        
        .related-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 10px;
        }
        
        .related-item {
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .related-item:hover {
            background-color: rgba(52, 152, 219, 0.1);
            border-color: var(--primary-color);
        }
        
        /* Categories Section */
        .categories-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 2rem 0;
        }
        
        .category-card {
            background-color: white;
            border-radius: 8px;
            border: 1px solid #ddd;
            padding: 1.5rem;
            transition: all 0.3s;
            cursor: pointer;
        }
        
        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .category-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        
        .math-icon {
            background-color: rgba(52, 152, 219, 0.1);
            color: var(--primary-color);
        }
        
        .physics-icon {
            background-color: rgba(231, 76, 60, 0.1);
            color: var(--danger-color);
        }
        
        .chemistry-icon {
            background-color: rgba(46, 204, 113, 0.1);
            color: var(--prime-green);
        }
        
        .universal-icon {
            background-color: rgba(155, 89, 182, 0.1);
            color: var(--prime-purple);
        }
        
        .astronomy-icon {
            background-color: rgba(243, 156, 18, 0.1);
            color: var(--warning-color);
        }
        
        .category-name {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .category-count {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .search-container {
                flex-direction: column;
            }
            
            .category-filter {
                width: 100%;
            }
            
            .constant-detail-body {
                grid-template-columns: 1fr;
            }
            
            .constants-table {
                display: block;
                overflow-x: auto;
            }
        }