Panels shared edges: two 1px borders meeting, which reads as one tall
surface with a rule across it rather than a seam between two.
Done as `margin-bottom` on the panel first, which is the anti-pattern, and
it failed in both of the ways that rule is known to fail before the reading
was done. It compounded with the gap of every Stack that already held
panels -- four of them, spacing those lists at 35.2px against the app's
17.6px -- and the `:last-child` reset meant to keep trailing space off the
bottom of a container silently did nothing, because Media wrapping makes a
panel the only child of its own wrapper. On Status that separated four
pairs out of five and left the first touching.
So the space belongs to whatever stacks the blocks. `.wrolpi-stack` is on
PageContainer, which every page uses, and on the three wrappers that stack
blocks somewhere the page's own stack cannot reach: Settings' panel wrapper,
the block below the video player, and the Zim and Map route wrappers, which
hold their tab bar outside PageContainer.
A gap rather than `> * + * { margin-top }`, which was tried and is quietly
broken here: Media injects `.fresnel-container { margin: 0; padding: 0 }` at
runtime, same specificity, later source order, so every wrapped block threw
the margin away. A child cannot zero its parent's gap. It also means
Media's hidden half contributes nothing, where the owl selector spaced
around something invisible.
With the page owning the spacing, the blocks that owned some of it had to
give it up, or their margin was added to the gap: the tab bar (33px against
17.6 everywhere else), the shared search control bar and paginator on
Videos/Archives/Docs/Files, the card grid, the file browser's filter row and
the inventory search. Two margins deliberately stay -- the file browser's
4em, which reserves room for the sticky buttons (62645831), and heading
margins, which bind a heading to the content below it.
Tests plant each of the three failures: the wrapped block, a child that
zeroes its own margin, and a hidden Media half. Verified in the browser on
sixteen routes and in all four themes -- every stacked pair 17.6px, the
map's 85vh box and the video player unchanged, no horizontal overflow.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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