: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;
            --math-color: #6f42c1;
            --calc-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);
        }
        .btn-primary:disabled {
            opacity: 0.6;
            pointer-events: none;
        }
        .pin-list {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            margin: 1rem 0;
        }
        .pin-item {
            background-color: white;
            border-radius: 6px;
            padding: 0.75rem 1rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border: 1px solid var(--border-color);
            font-family: 'Courier New', monospace;
            font-size: 1.3rem;
            letter-spacing: 2px;
        }
        .pin-actions {
            display: flex;
            gap: 0.5rem;
        }
        .pin-action-btn {
            background: none;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 0.3rem 0.6rem;
            color: var(--text-muted);
            transition: all 0.2s;
        }
        .pin-action-btn:hover {
            background-color: var(--light-gray);
            color: var(--primary-color);
        }
        .copy-btn-container {
            display: flex;
            justify-content: flex-end;
            gap: 10px;
            margin: 10px 0;
        }
        .security-tip {
            background-color: rgba(255, 193, 7, 0.05);
            border-left: 3px solid var(--warning-color);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            }
        .function-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);
        }
        .options-panel {
            background: var(--light-gray);
            padding: 1rem;
            border-radius: 6px;
            margin: 1rem 0;
        }
        .form-check-input:checked {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .strength-indicator {
            height: 5px;
            border-radius: 3px;
            background: #ddd;
            margin: 0.5rem 0;
        }
        .strength-fill {
            height: 100%;
            border-radius: 3px;
            background: var(--success-color);
            width: 0%;
        }
        .charset-preview {
            font-family: 'Courier New', monospace;
            background: white;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-size: 0.9rem;
            border: 1px solid var(--border-color);
            display: inline-block;
            max-width: 100%;
            overflow-x: auto;
            white-space: nowrap;
        }