Challenge 2: Identify the Contrast Failure — Possible Solution
====================================================================

THE SCENARIO
-------------
White text (#FFFFFF) on a light gray background (#D3D3D3), normal
(non-large) size.

WHY THIS LIKELY FAILS WCAG AA
----------------------------------
This chapter's threshold table requires a MINIMUM 4.5:1 contrast ratio
for normal text at Level AA. White (#FFFFFF) and light gray (#D3D3D3)
are both very LIGHT colors sitting close together on the brightness
scale — there's very little difference in luminance between them.
Pairing two colors that are both near the light end of the spectrum,
rather than pairing a light color with a genuinely dark one, is
precisely the kind of combination that tends to fall well short of a
4.5:1 ratio — the actual computed ratio for this specific pairing is
roughly 1.6:1, dramatically below the 4.5:1 minimum, though the exact
number isn't the point here so much as recognizing the PATTERN: two
similarly-light colors paired together are a strong signal of a likely
contrast failure without needing to compute anything.

WHY THIS MATTERS PRACTICALLY
--------------------------------
This chapter frames the threshold as existing specifically to serve
"low vision, aging eyes, and glare on mobile screens outdoors" — a
white-on-light-gray button label is exactly the kind of low-contrast
pairing that becomes nearly invisible under bright outdoor lighting or
for anyone with reduced visual acuity, even though it might look
perfectly readable to someone with typical vision looking at a
well-lit screen indoors.

THE FIX (implied, using the same principle)
------------------------------------------------
Either darken the background significantly (e.g. a much darker gray or
a saturated brand color) while keeping white text, or switch to dark
text on the existing light gray background — either approach increases
the luminance DIFFERENCE between the text and its background enough to
clear the 4.5:1 threshold, rather than adjusting only one color
slightly while keeping both colors in the same light range.

WHY THIS WORKS AS AN ANSWER
------------------------------
The key reasoning skill here isn't computing an exact contrast ratio by
hand — it's recognizing that two colors sitting close together in
overall lightness/darkness (rather than one clearly light and one
clearly dark) are a strong practical warning sign of an AA failure,
directly connecting back to why the chapter frames these thresholds
around real visual conditions (low vision, glare) rather than as an
arbitrary technical requirement.