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The tab strip's hairlines used --border, which is authored for near-white surfaces: its other uses sit on --surface-raised (L=1.0) where it gives a reasonable dL 0.055, but on --app-shell (L=0.964) it collapses to dL 0.019 -- about a quarter of the 0.068-0.080 the rest of the chrome's 1px keylines run at, so it read as almost invisible. Move both the tab separator and the pinned-zone divider to --surface-border, which the surrounding chrome (the active tab's border, the flare arcs, the content card's ring) already uses, and which is what the system draws for separators on --sidebar -- a surface whose lightness is identical to --app-shell. Also fade a hairline out while either tab it divides is hovered, so it no longer lingers 2px off the hover pill's rounded edge. The hairline sits on a tab's own left edge, so the pair's other half belongs to the neighbouring component instance and no ancestor-based variant can reach it; hence the adjacent-sibling custom variant. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: multica-agent <github@multica.ai>