Function card_selected_bg 

pub fn card_selected_bg() -> Hsla

Selected/keyboard-active treatment for rows and chips INSIDE a floating card (menu rows, the picker rail, segmented chips). The card is already the bright plane in light mode, so a white lift can’t read there — selection is the tone-flipped grey wash, at 6% (dark’s 11% read too dark on the bright plane, user report).