Reorganize scss folder

scss/layout/_breakpoints.scss

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+// Breakpoint viewport sizes and media queries.
+//
+// Breakpoints are defined as a map of (name: minimum width), order from small to large:
+//
+//    (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px)
+//
+// The map defined in the `$grid-breakpoints` global variable is used as the `$breakpoints` argument by default.
+
+// Name of the next breakpoint, or null for the last breakpoint.
+//
+//    >> breakpoint-next(sm)
+//    md
+//    >> breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
+//    md
+//    >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl xxl))
+//    md
+@function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
+  $n: index($breakpoint-names, $name);
+  @if not $n {
+    @error "breakpoint `#{$name}` not found in `#{$breakpoints}`";
+  }
+  @return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
+}
+
+// Minimum breakpoint width. Null for the smallest (first) breakpoint.
+//
+//    >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
+//    576px
+@function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
+  $min: map-get($breakpoints, $name);
+  @return if($min != 0, $min, null);
+}
+
+// Maximum breakpoint width.
+// The maximum value is reduced by 0.02px to work around the limitations of
+// `min-` and `max-` prefixes and viewports with fractional widths.
+// See https://www.w3.org/TR/mediaqueries-4/#mq-min-max
+// Uses 0.02px rather than 0.01px to work around a current rounding bug in Safari.
+// See https://bugs.webkit.org/show_bug.cgi?id=178261
+//
+//    >> breakpoint-max(md, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
+//    767.98px
+@function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
+  $max: map-get($breakpoints, $name);
+  @return if($max and $max > 0, $max - .02, null);
+}
+
+// Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.
+// Useful for making responsive utilities.
+//
+//    >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
+//    ""  (Returns a blank string)
+//    >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
+//    "-sm"
+@function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
+  @return if(breakpoint-min($name, $breakpoints) == null, "", "-#{$name}");
+}
+
+// Media of at least the minimum breakpoint width. No query for the smallest breakpoint.
+// Makes the @content apply to the given breakpoint and wider.
+@mixin media-breakpoint-up($name, $breakpoints: $grid-breakpoints) {
+  $min: breakpoint-min($name, $breakpoints);
+  @if $min {
+    @media (min-width: $min) {
+      @content;
+    }
+  } @else {
+    @content;
+  }
+}
+
+// Media of at most the maximum breakpoint width. No query for the largest breakpoint.
+// Makes the @content apply to the given breakpoint and narrower.
+@mixin media-breakpoint-down($name, $breakpoints: $grid-breakpoints) {
+  $max: breakpoint-max($name, $breakpoints);
+  @if $max {
+    @media (max-width: $max) {
+      @content;
+    }
+  } @else {
+    @content;
+  }
+}
+
+// Media that spans multiple breakpoint widths.
+// Makes the @content apply between the min and max breakpoints
+@mixin media-breakpoint-between($lower, $upper, $breakpoints: $grid-breakpoints) {
+  $min: breakpoint-min($lower, $breakpoints);
+  $max: breakpoint-max($upper, $breakpoints);
+
+  @if $min != null and $max != null {
+    @media (min-width: $min) and (max-width: $max) {
+      @content;
+    }
+  } @else if $max == null {
+    @include media-breakpoint-up($lower, $breakpoints) {
+      @content;
+    }
+  } @else if $min == null {
+    @include media-breakpoint-down($upper, $breakpoints) {
+      @content;
+    }
+  }
+}
+
+// Media between the breakpoint's minimum and maximum widths.
+// No minimum for the smallest breakpoint, and no maximum for the largest one.
+// Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
+@mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
+  $min:  breakpoint-min($name, $breakpoints);
+  $next: breakpoint-next($name, $breakpoints);
+  $max:  breakpoint-max($next, $breakpoints);
+
+  @if $min != null and $max != null {
+    @media (min-width: $min) and (max-width: $max) {
+      @content;
+    }
+  } @else if $max == null {
+    @include media-breakpoint-up($name, $breakpoints) {
+      @content;
+    }
+  } @else if $min == null {
+    @include media-breakpoint-down($next, $breakpoints) {
+      @content;
+    }
+  }
+}

scss/layout/_containers.scss

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+@use "../config" as *;
+@use "breakpoints" as *;
+
+// Container widths
+//
+// Set the container width, and override it for fixed navbars in media queries.
+// Container mixins
+
+@mixin make-container($gutter: $container-padding-x) {
+  --#{$prefix}gutter-x: #{$gutter};
+  --#{$prefix}gutter-y: 0;
+  width: 100%;
+  padding-right: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  padding-left: calc(var(--#{$prefix}gutter-x) * .5); // stylelint-disable-line function-disallowed-list
+  margin-right: auto;
+  margin-left: auto;
+}
+
+@if $enable-container-classes {
+  // Single container class with breakpoint max-widths
+  .container,
+  // 100% wide container at all breakpoints
+  .container-fluid {
+    @include make-container();
+  }
+
+  // Responsive containers that are 100% wide until a breakpoint
+  @each $breakpoint, $container-max-width in $container-max-widths {
+    .container-#{$breakpoint} {
+      @extend .container-fluid;
+    }
+
+    @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
+      %responsive-container-#{$breakpoint} {
+        max-width: $container-max-width;
+      }
+
+      // Extend each breakpoint which is smaller or equal to the current breakpoint
+      $extend-breakpoint: true;
+
+      @each $name, $width in $grid-breakpoints {
+        @if ($extend-breakpoint) {
+          .container#{breakpoint-infix($name, $grid-breakpoints)} {
+            @extend %responsive-container-#{$breakpoint};
+          }
+
+          // Once the current breakpoint is reached, stop extending
+          @if ($breakpoint == $name) {
+            $extend-breakpoint: false;
+          }
+        }
+      }
+    }
+  }
+}

scss/layout/_grid.scss

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+@use "sass:map";
+@use "../config" as *;
+@use "breakpoints" as *;
+
+// mdo-do
+// - check gap utilities as replacement for gutter classes from v5
+
+// Row
+//
+// Rows contain your columns.
+
+:root {
+  @each $name, $value in $grid-breakpoints {
+    --#{$prefix}breakpoint-#{$name}: #{$value};
+  }
+}
+
+.grid {
+  --#{$prefix}columns: #{$grid-columns};
+  --#{$prefix}rows: 1;
+  --#{$prefix}gap: #{$grid-gutter-width};
+
+  display: grid;
+  grid-template-rows: repeat(var(--#{$prefix}rows), 1fr);
+  grid-template-columns: repeat(var(--#{$prefix}columns), 1fr);
+  gap: var(--#{$prefix}gap);
+}
+
+@each $breakpoint in map.keys($grid-breakpoints) {
+  $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+  @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
+    @if $grid-columns > 0 {
+      @for $i from 1 through $grid-columns {
+        .col#{$infix}-#{$i} {
+          grid-column: auto / span $i;
+        }
+
+        .end#{$infix}-#{$i} {
+          grid-column-end: $i;
+        }
+      }
+
+      // Start with `1` because `0` is an invalid value.
+      // Ends with `$columns - 1` because offsetting by the width of an entire row isn't possible.
+      @for $i from 1 through ($grid-columns - 1) {
+        .col-start#{$infix}-#{$i} {
+          grid-column-start: $i;
+        }
+      }
+    }
+  }
+}
+
+// mdo-do: add to utilities?
+.grid-cols-subgrid {
+  grid-template-columns: subgrid;
+}
+
+.grid-fill {
+  --#{$prefix}gap: #{$grid-gutter-width};
+
+  display: grid;
+  grid-auto-flow: row;
+  grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
+  gap: var(--#{$prefix}gap);
+}
+
+// mdo-do: add to utilities?
+.g-col-auto {
+  grid-column: auto/auto;
+}
+
+// mdo-do: add to utilities?
+.grid-cols-3 {
+  --#{$prefix}columns: 3;
+}
+.grid-cols-4 {
+  --#{$prefix}columns: 4;
+}
+.grid-cols-6 {
+  --#{$prefix}columns: 6;
+}

scss/layout/index.scss

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+@import "breakpoints";
+@import "containers";
+@import "grid";