My panel is see-through on light and solid on dark. Same component.
The dark fill never got its alpha. bg-background/70 dresses the light theme alone, so a bare dark:bg-background lands underneath it at full strength. Give the dark rule the same alpha and the panel stays glass in both.
And the border?
Lighten it to match: border-border/40. A solid edge around a translucent fill reads as a card with a hole cut in it.

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