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The previous fixes only handled sub-square zoom lines. At field zoom the 20°x10° grid lines were drawn unconditionally: cellLabel(zoom<6) returns 2-char fields which never match the 4-char workedGrids set, so every field line crossed every worked 2°x1° square. Bright-yellow (alpha 160) lines through the green fill is what read as 'green got brighter' — the fill color itself never changed. Now both line passes iterate the finer 2°x1° sub-grid (forced 4-char labels via GRID_ZOOM_SUB) and skip segments bordering worked cells, at field zoom and sub-square zoom alike. Revert the alpha softening (c2e496c4) — the fill was never the problem; also restores worked-cell labels (7afce7eerevert).