: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;
            --physics-color: #6f42c1;
            --electrical-color: #e83e8c;
            --quantum-color: #20c997;
        }
        .page-header {
            background: linear-gradient(135deg, rgba(111, 66, 193, 0.1) 0%, rgba(44, 125, 160, 0.2) 100%);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid rgba(44, 125, 160, 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(44, 125, 160, 0.15);
        }
        .conversion-card {
            background: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        .conversion-header {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
            padding-bottom: 0.75rem;
            border-bottom: 1px solid var(--border-color);
        }
        .conversion-icon {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background-color: rgba(111, 66, 193, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--physics-color);
            font-size: 1.2rem;
        }
        .conversion-result {
            padding: 15px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 1.3rem;
            margin: 10px 0;
            text-align: center;
            font-weight: 600;
            color: var(--physics-color);
        }
        .formula-box {
            background-color: rgba(32, 201, 151, 0.1);
            border-left: 4px solid var(--quantum-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
            font-family: 'Courier New', monospace;
        }
        .energy-comparison {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .comparison-item {
            background: white;
            border-radius: 6px;
            border: 1px solid var(--border-color);
            padding: 1rem;
            text-align: center;
            transition: all 0.3s;
        }
        .comparison-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .comparison-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--physics-color);
            margin-bottom: 0.5rem;
        }
        .comparison-label {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .physics-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--physics-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .quantum-box {
            background-color: rgba(32, 201, 151, 0.05);
            border-left: 3px solid var(--quantum-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            .energy-comparison {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
        }
        .conversion-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-btn {
            background-color: rgba(111, 66, 193, 0.1);
            border: 1px solid rgba(111, 66, 193, 0.2);
            border-radius: 4px;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            color: var(--physics-color);
            cursor: pointer;
            transition: all 0.2s;
        }
        .example-btn:hover {
            background-color: rgba(111, 66, 193, 0.2);
            transform: translateY(-2px);
        }
        .conversion-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        .conversion-table th, .conversion-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        .conversion-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        .conversion-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        .mode-toggle {
            display: flex;
            justify-content: center;
            margin: 1.5rem 0;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
        }
        .mode-btn {
            flex: 1;
            padding: 0.75rem 1rem;
            background-color: var(--light-gray);
            border: none;
            font-weight: 600;
            color: var(--text-muted);
            transition: all 0.3s;
            cursor: pointer;
        }
        .mode-btn.active {
            background-color: var(--physics-color);
            color: white;
        }
        .mode-btn:not(.active):hover {
            background-color: rgba(111, 66, 193, 0.1);
        }
        .form-section {
            display: none;
        }
        .form-section.active {
            display: block;
        }
        .unit-badge {
            display: inline-block;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-left: 0.5rem;
        }
        .volt-badge {
            background-color: rgba(232, 62, 140, 0.1);
            color: #e83e8c;
        }
        .joule-badge {
            background-color: rgba(40, 167, 69, 0.1);
            color: #28a745;
        }
        .electronvolt-badge {
            background-color: rgba(111, 66, 193, 0.1);
            color: #6f42c1;
        }
        .coulomb-badge {
            background-color: rgba(255, 193, 7, 0.1);
            color: #ffc107;
        }
        .energy-badge {
            background-color: rgba(32, 201, 151, 0.1);
            color: #20c997;
        }
        .quantum-particles {
            display: flex;
            justify-content: space-around;
            margin: 1rem 0;
        }
        .particle {
            text-align: center;
            padding: 1rem;
            border-radius: 8px;
            background-color: white;
            border: 1px solid var(--border-color);
            width: 120px;
        }
        .particle-icon {
            font-size: 2rem;
            margin-bottom: 0.5rem;
            color: var(--physics-color);
        }
        .particle-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }
        .particle-charge {
            font-size: 0.85rem;
            color: var(--text-muted);
        }