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d8ce090f82
adjustBrightness() added/subtracted a flat 255*percent to every RGB channel. For a dark base color (channels already close to 0), darkening by -0.3/-0.45/-0.6 clamped every channel to 0, so shades 700, 800, and 900 all came back as the identical, useless #000000 instead of a graded dark scale -- reproducible with any sufficiently dark brand primary (e.g. #4A3228), not just an edge case. Blend each channel proportionally toward white (percent > 0) or black (percent < 0) instead, so the shift scales with how much headroom the channel actually has. Adds a regression test that syncs a dark brand color and asserts the 700/800/900 shades stay distinct and non-black. Claude-Session: https://claude.ai/code/session_01MmtTPnoqMrjjhKjod9VTzr Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>