  border-right: 1px solid var(--border-color);
            transition: none; /* Disable transitions for better performance */
        }

        .cm-s-simpsons-dark .CodeMirror-linenumber { 
            color: var(--text-secondary) !important;
        }

        /* Remove transitions from elements that change in dark mode */
        [data-theme="dark"] .panel,
        [data-theme="dark"] input,
        [data-theme="dark"] select,
        [data-theme="dark"] button {
            transition: none !important;
