For example the parentheses here, Overall the contrast in the line is low and difficult to make out.

To be consistent with how other themes work, I've changed things to a transparent green and yellow (from nord) for focused and unfocused lines.
"workbench.colorCustomizations": {
"[Nord]": {
"editor.focusedStackFrameHighlightBackground": "#a3be8c33",
"editor.stackFrameHighlightBackground": "#ebcb8b33",
}
}

