Single-page layout with a centred message, a colour-scheme toggle, and a
"Check again" button. styles.css defines two palettes selected via the
data-theme attribute: modern DLR turquoise/teal and the original 1987
red-and-blue livery.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Emma Thorpe