.math-equation, .key-length-badge {
            font-size: 0.75rem;
            background: #e9ecef;
            padding: 0.2rem 0.5rem;
            border-radius: 12px;
        }
        .hex-input {
            font-family: 'Courier New', monospace;
            font-size: 0.9rem;
        }
        .result-label {
            font-weight: 600;
            width: 120px;
            display: inline-block;
        }
        .copy-icon {
            cursor: pointer;
            margin-left: 12px;
            color: #6c757d;
            transition: 0.2s;
        }
        .copy-icon:hover {
            color: var(--primary-color);
        }
        .success-note {
            background-color: #d4edda;
            border-color: #c3e6cb;
            color: #155724;
        }
        .mode-selector {
            background: #f1f3f5;
            border-radius: 40px;
            padding: 4px;
        }
        .mode-option {
            cursor: pointer;
            padding: 6px 20px;
            border-radius: 32px;
            transition: 0.2s;
            display: inline-block;
        }
        .mode-option.active {
            background: white;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            font-weight: 500;
            color: var(--primary-color);
        }
        .auth-tag-help {
            font-size: 0.8rem;
            color: #6c757d;
        }