: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;
            --cipher-color: #6f42c1;
            --crypto-color: #e83e8c;
        }
    .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);
        }
        .cipher-output {
            background-color: white;
            border-radius: 6px;
            border: 1px solid #eee;
            font-size: 1.2rem;
            padding: 1rem;
            font-family: 'Courier New', monospace;
            word-break: break-word;
            min-height: 80px;
        }
        .shift-slider {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .shift-slider input[type=range] {
            flex: 1;
        }
        .shift-value {
            width: 70px;
            text-align: center;
            font-weight: 600;
            background-color: white;
            border: 1px solid #ddd;
            border-radius: 4px;
            padding: 0.4rem;
        }
        .mode-toggle {
            display: flex;
            gap: 1rem;
            margin-bottom: 1rem;
        }
        .mode-btn {
            flex: 1;
            background-color: white;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            padding: 0.6rem;
            font-weight: 600;
            color: var(--text-color);
            transition: all 0.2s;
        }
        .mode-btn.active {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            color: white;
        }
        .mode-btn:not(.active):hover {
            background-color: var(--light-gray);
        }
        .action-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-top: 1rem;
        }
        .action-buttons .btn {
            padding: 0.5rem 1rem;
        }
        .brute-table {
            max-height: 300px;
            overflow-y: auto;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            background: white;
        }
        .brute-row {
            display: flex;
            border-bottom: 1px solid #eee;
            font-family: 'Courier New', monospace;
        }
        .brute-row:last-child {
            border-bottom: none;
        }
        .brute-shift {
            width: 70px;
            padding: 0.5rem;
            background-color: var(--light-gray);
            font-weight: 600;
            border-right: 1px solid #ddd;
            flex-shrink: 0;
        }
        .brute-text {
            flex: 1;
            padding: 0.5rem;
            white-space: nowrap;
            overflow-x: auto;
        }
        .brute-row:hover {
            background-color: rgba(44, 125, 160, 0.05);
        }
        @media (max-width: 576px) {
            .brute-text {
                white-space: normal;
                word-break: break-word;
            }
        }
        .cipher-box {
            background-color: rgba(111, 66, 193, 0.05);
            border-left: 3px solid var(--cipher-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        .example-btn {
            background-color: rgba(44, 125, 160, 0.1);
            border: 1px solid rgba(44, 125, 160, 0.2);
            border-radius: 4px;
            padding: 0.4rem 0.8rem;
            font-size: 0.9rem;
            color: var(--primary-color);
            cursor: pointer;
            transition: all 0.2s;
            display: inline-block;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        .example-btn:hover {
            background-color: rgba(44, 125, 160, 0.2);
            transform: translateY(-1px);
        }
        .option-help {
            margin-left: 0.3rem;
            color: var(--text-muted);
            cursor: help;
            font-size: 0.9rem;
        }
        .option-help:hover {
            color: var(--primary-color);
        }