Minimalist A4 habit tracker, black and white, no text, no labels, one column per day, dates from 16 to 30 followed by 1 to 15 represented as 30 vertical columns, perfectly aligned square grid, each column contains evenly sized square checkboxes, left side has empty horizontal lines for writing habit names, clean thin lines, geometric precision, equal spacing, consistent square proportions, lots of white space, print-ready layout, vector style, high resolution, no decorations, no shadows, no colors
