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nav is groups, each an optional heading plus its entries; an entry with its own items reveals them while the route sits inside it. Groups are separated by space rather than a rule, so a long list reads as one quiet column. The panel sits straight on the page background with no surface of its own — navigation is not content, and only the main area's cards should read as panels. Hover a row anywhere across the column: the whole width is the link, and the tint stops at the label rather than painting a block the width of the panel.

A group can set divider to take a hairline above it. Reach for it where the list stops being one thing and starts being another — a few guides above, the index they introduce below — and not between two peer groups, where a rule each would turn a quiet column into a form. It is skipped on the first group rendered, so filtering a list down to its tail cannot leave a rule floating at the top.

Only the page you are on takes the bg-selected tint. A section whose *child* is current expands but stays plain — two filled rows would read as two locations. Nothing is dimmed to make that true: labels are never text-muted, because a dimmed destination reads as a disabled one.