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// BS3 -> BS4 saw a removal of margin-top on headers,
// which is a pretty jarring change, expecially for Rmd
// https://github.com/twbs/bootstrap/blob/f17f882d/dist/css/bootstrap.css#L1219-L1250
// https://github.com/twbs/bootstrap/blob/4de4874e/scss/_reboot.scss#L82-L89
@mixin section-margin-top($levels, $margin-top) {
@each $level in $levels {
:where(.section.level#{$level}, section.level#{$level}) {
margin-top: $margin-top;
}
}
}
@if $bootstrap-version >= 5 {
// For BS5+, only apply the margin-top if pandoc's CSS classes
// are present. This way rmarkdown::html_document_base will continue
// to have margin-top (which is good), but 'raw' headers won't, which
// leads to a better experience with accordions, popovers, etc
// (their design/examples expect headers that don't have margin-top).
// It also seems as though Quarto docs don't generate these CSS classes,
// but it also seems they've added their own rules https://github.com/quarto-dev/quarto-cli/blob/0e662c/src/resources/formats/html/bootstrap/_bootstrap-rules.scss#L595-L613.
// In pandoc, `--to html4` writes `div.section.levelX` and `--to html5`
// produces `section.levelX` elements.
@include section-margin-top(1 2 3, 1.5 * $spacer);
@include section-margin-top(4 5 6, $spacer);
} @else {
h1, h2, h3 { margin-top: 1.5 * $spacer;}
h4, h5, h6 { margin-top: $spacer; }
}
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