@border-width-thin: 0.0625rem; // Thin border (0.0625rem / 1px at the default root) — hairlines, dividers, and default control borders.
@border-width-thick: 0.125rem; // Thick border (0.125rem / 2px at the default root) — emphasis borders and selected states.
@border-width-thicker: 0.25rem; // Thicker border (0.25rem / 4px at the default root) — focus rings and high-emphasis outlines.
@border-width-default: 0.0625rem; // Default border width — aliases thin so the system-wide default can be retuned in one place.