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tiennm99
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## Heatmap — two halves, 8x8 cells The single-row 53-week layout could never hold square cells larger than 4x4 inside a 340 px card — cramped. Split the year in half (ceil(weeks/2) on top, floor on bottom) and each half is ~27 weeks wide, freeing the cells to be 8x8 (4x the area) while keeping comfortable left (30 px) and right (~67 px) gutters. Grid: topPadA = 45, half = 7*9 - 1 = 62 tall halfGap = 13 topPadB = 120, same 62 tall grid bottom at y = 182, 18 px frame margin Year still reads top-to-bottom left-to-right, just with one extra line break at the midpoint. Dropped the separate Less/More legend — at 8x8 the intensity gradient is self-explanatory, and the removal buys the vertical space the new layout needs. Refactored into a helper `renderHeatmapHalf` so the two halves share a single code path (labels + month markers + cells). ## Font-size vocabulary Four named constants in svg.go: fontBody=12, fontLabel=11, fontAxis=10, fontBigNum=28. Every card's existing literals already sit on this ladder except the heatmap, which was using 9 for weekday/month labels. Heatmap now routes through fontAxis so the whole gallery shares one size scale. Other cards' literals weren't rewritten to reference the constants (pure churn for no behavior change); the constants give future cards the vocabulary and the design-guidelines the schema.