Halo is a matte glass player: frosted, lightly grained panes that float over the film and are shaped only by light, so the controls feel like part of one object and not stickers on a video. The panes blur the footage behind them, which keeps the controls readable on bright and dark scenes with no gradient over the picture. Light falls from the top left: raised controls catch it, hovering lifts and brightens one, and pressing sinks it into the glass, where a switched-on control stays. Charcoal is the only accent, used for icons, text and progress, and its icons keep at least 4.5:1 against the glass even over black frames. Focus is a solid charcoal ring, every control has a 42px or larger target, reduced-motion users get no transitions, and a higher-contrast or reduced-transparency preference turns the glass solid, with higher contrast also adding a real outline to every control.