19. Section Container — Structure Types
Distinct container types: standard, elevated, collapsible, split.
1 · Standard Panel
Section Title
Standard surface container with neutral border and panel background.
2 · Elevated Panel
accent marker + stronger border
Elevated Section
Focused container with strong border and subtle shadow.
3 · Collapsible Panel
Collapsible section
Expandable body content.
4 · Split Panel
header + two regions
Data section
Left region — fields
Right region — preview