Every control is square (radius 0). Action buttons carry a solid 0 2px 0 #002d18 bottom edge and hover to #005a30; focus is a bright #ffdd00 highlight with a #0b0c0c underline on buttons, links and inputs alike.
Radius 0px on every element. No soft shadows — the only box-shadows are solid slabs used as physical button edges. Motion: none — zero transitions, zero keyframes, no animation library anywhere (a deliberate accessibility-first choice); the only "movement" is a link underline thickening on hover.