OKLCH Studio · color reference

red-900 in OKLCH

Tailwind v4 red-900: oklch(0.396 0.141 25.7), HEX #82181A. WCAG + APCA pairs, Fix deep links, and @theme snippet.

red-900 is a deep shade — strong for text on light surfaces and dark UI chrome. Pair with lighter stops for surfaces.

#82181A · oklch(0.396 0.141 25.7)

Contrast pairs

WCAG 2.1 normal text + APCA Lc. Open a pair in the live Fix tool — informational only, not a legal audit.

Text on white10.02:1 · AAA · Lc 92
#82181A on #FFFFFF
Open in Contrast →
White on swatch10.02:1 · AAA · Lc 96
#FFFFFF on #82181A
Open in Contrast →
Black on swatch2.09:1 · Fail · Lc 12
#000000 on #82181A
Open in Contrast →
Suggested text on swatch10.02:1 · AAA · Lc 96
#FFFFFF on #82181A
Open in Contrast →

Against #121212: On near-black (#121212), Fix nudges this stop to #D3645D for AA text.

@theme {
  --color-red-900: oklch(0.396 0.141 25.7);
}

Static reference — the live Fix tool uses the same WCAG math with Undo and share links.