#set page(
  paper: "a7",
  numbering: "1 / 1",
  margin: (bottom: 1cm, rest: 0.5cm),
)

#show heading.where(level: 1, outlined: true): it => [
  #it

  #set text(size: 12pt, weight: "regular")
  #outline(
    title: "Chapter outline",
    indent: true,
    target: heading
      .where(level: 1)
      .or(heading.where(level: 2))
      .after(it.location(), inclusive: true)
      .before(
        heading
          .where(level: 1, outlined: true)
          .after(it.location(), inclusive: false),
        inclusive: false,
      )
  )
]

#set heading(outlined: true, numbering: "1.")

= Section 1
== Subsection 1
== Subsection 2
=== Subsubsection 1
=== Subsubsection 2
== Subsection 3

= Section 2
== Subsection 1
== Subsection 2

= Section 3
== Subsection 1
== Subsection 2
=== Subsubsection 1
=== Subsubsection 2
=== Subsubsection 3
== Subsection 3