Thank-you page after sending

Visitors immediately know their request went through, when they will hear back and what happens next. The summary repeats the request with its reference, copyable in one click and printable; the print stylesheet hides buttons and links. Accessibility: a single level-one heading followed by named sections, a description list for the summary, an ordered list of steps with aria-current="step" on the current one, copy confirmation announced by a role="status" region, visible focus on every control, AA contrast in light and dark modes. The checkmark animation is removed with prefers-reduced-motion. Without JavaScript the copy and print buttons stay hidden instead of doing nothing. One column from 360 px, two on tablets.