Module classes 

Shared interactive-base class fragments. Single source of truth for the focus-visible ring, disabled treatment, and frequency-tiered motion, composed into each component’s class string so the interactive feel cannot drift.

Every constant is a complete class literal in crate source so the Tailwind @source scanner picks the utilities up; compose via concat!/format! of these fragments — never build class names dynamically.

Constants

HIT_TARGET_MIN

Minimum 44px hit target for interactive elements (WCAG 2.5.5). Full literal.

HIT_TARGET_NUMPAD

Enlarged 56px hit target for Numpad keys (Phase 256 consumer). Full literal.

OVERSCROLL_CONTAIN

Prevents scroll bounce from escaping a pane boundary. Full literal.

PRESS_ACTIVE

Press-state feedback for tap surfaces: scale-down + border tint. Token-compliant (active:bg-border = --color-border); no raw palette class.

TAP_HIGHLIGHT

Removes the default iOS tap-highlight rectangle on touch targets. Backed by @utility pos-tap-highlight in input.css (Path B — guaranteed CSS).

TOUCH_ACTION

Touch-manipulation scroll optimisation for tap targets. Full literal.