scrollY: 0 / 0
#1 TOP HEADER — blur(20px)
Expect: RED/top colors. Bug = BLUE/bottom.
#6 SATURATE+BRIGHTNESS (no blur)
Expect: dark saturated RED. Bug = dark saturated BLUE.
#4 OFF-CENTER
Expect: upper-left colors
#3 CENTER CARD
Expect: center colors (flip = same)
#7 OWN RENDER PASS (translateZ(0))
Expect: same as surrounding. If correct while #1 broken → root pass bug.
#2 BOTTOM FOOTER — blur(20px)
Expect: BLUE/bottom colors. Bug = RED/top.
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4
#5 IN-FLOW BLUR — Expect: band 4 colors
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