game.ui.hud — the four corners of the playing screen. The HUD is four SEPARATE screens, each rooted in an `anchor`, because an anchored root occupies only its own content: nothing here covers the viewport, so the pointer reaches the game and the laser's left button is never eaten by a transparent HUD box. It is also why each part re-renders on its own data changing rather than all four on any of it. TopLeft the three cats, and what each one is doing TopRight the dawn meter, the clock, the tower Center the crosshair, with the pointer's heat closing round it BottomCenter Hoshi on the intercom, and the pointer's warnings An anchor stretches its child across the space it was given rather than hugging it, so a TopRight anchor holding a plain column draws that column down the MIDDLE of the screen. Every part here therefore puts a full-width rail inside the anchor and pushes its content to the edge the anchor names with justifyContent — which is also why a card, which wants the whole viewport, is not built out of anchors at all. Every size comes from theme.metrics(), which reads ui.screenSize() afresh: the same trees lay out on a phone and on a television.