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Two adjacent backdrop-filter elements (nav at y=0-80, filter at y=80+) always show a visible seam at their boundary because each filter clips its own blur kernel, so the edge pixels sample slightly different neighborhoods. Same recipe doesn't help — it's a structural issue. Fix: when filter is stuck, render an absolutely-positioned glass child inside the filter that extends from -top-20 to bottom-0 (i.e. covers nav area + filter area as ONE element). Nav reads filterStuck from a tiny shared zustand UI store and disables its own glass layer in that state, so only the shared band is visible. Single element, single backdrop-filter, no seam. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>