: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;
            --crypto-color: #dc3545;
            --key-color: #6f42c1;
        }
         .page-header {
            background: linear-gradient(135deg, rgba(169, 214, 229, 0.4) 0%, rgba(44, 125, 160, 0.4) 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);
        }
        .btn-crypto {
            background-color: var(--crypto-color);
            border-color: var(--crypto-color);
            color: white;
            font-weight: 600;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        .btn-crypto:hover {
            background-color: #b02a37;
            border-color: #b02a37;
            transform: translateY(-1px);
            color: white;
        }
        .crypto-result {
            padding: 12px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid #eee;
            font-size: 1rem;
            font-family: 'Courier New', monospace;
            margin: 10px 0;
            word-break: break-all;
            max-height: 200px;
            overflow-y: auto;
        }
        .math-equation {
            font-size: 1.2rem;
            padding: 15px;
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 4px solid var(--key-color);
            border-radius: 4px;
            margin: 15px 0;
            font-family: monospace;
        }
        .format-selector {
            display: flex;
            gap: 1rem;
            align-items: center;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }
        .format-badge {
            background-color: var(--light-gray);
            border-radius: 20px;
            padding: 0.3rem 1rem;
            font-size: 0.9rem;
            border: 1px solid var(--border-color);
            cursor: pointer;
        }
        .format-badge.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .crypto-box {
            background-color: rgba(220, 53, 69, 0.05);
            border-left: 3px solid var(--crypto-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .key-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--key-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .key-examples {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .example-btn {
            background-color: rgba(44, 125, 160, 0.1);
            border: 1px solid rgba(44, 125, 160, 0.2);
            border-radius: 4px;
            padding: 0.5rem 0.75rem;
            font-size: 0.9rem;
            color: var(--primary-color);
            cursor: pointer;
            transition: all 0.2s;
            font-family: 'Courier New', monospace;
        }
        .example-btn:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-2px);
        }
        .algorithm-step {
            background-color: #f2f2f2;
            padding: 0.8rem;
            border-radius: 6px;
            margin-bottom: 1rem;
            font-family: 'Courier New', monospace;
            font-size: 0.95rem;
        }
        .algorithm-step pre {
            margin: 0.5rem 0 0;
            background: #1e1e1e;
            color: #d4d4d4;
            padding: 0.8rem;
            border-radius: 4px;
            overflow-x: auto;
        }