feat(PageLayout): Convert PageLayout to CSS modules behind feature flag

.changeset/lovely-hats-guess.md

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+---
+"@primer/react": minor
+---
+
+Convert PageLayout to CSS modules behind feature flags

packages/react/src/PageLayout/PageLayout.module.css

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+/* Maintain resize cursor while dragging */
+/* stylelint-disable-next-line selector-no-qualifying-type */
+body[data-page-layout-dragging='true'] {
+  cursor: col-resize;
+}
+
+/* Disable text selection while dragging */
+/* stylelint-disable-next-line selector-no-qualifying-type */
+body[data-page-layout-dragging='true'] * {
+  user-select: none;
+}
+
+.PageLayoutRoot {
+  /* Region Order */
+  --region-order-header: 0;
+  --region-order-pane-start: 1;
+  --region-order-content: 2;
+  --region-order-pane-end: 3;
+  --region-order-footer: 4;
+
+  /* Spacing Values */
+  --spacing-none: 0;
+  --spacing-condensed: var(--base-size-16);
+  --spacing-normal: var(--base-size-16);
+
+  @media screen and (min-width: 1012px) {
+    --spacing-normal: var(--base-size-24);
+  }
+
+  /* Pane Width Values */
+  --pane-width-small: 100%;
+  --pane-width-medium: 100%;
+  --pane-width-large: 100%;
+  --pane-max-width-diff: 511px;
+
+  @media screen and (min-width: 768px) {
+    --pane-width-small: 240px;
+    --pane-width-medium: 256px;
+    --pane-width-large: 256px;
+  }
+
+  @media screen and (min-width: 1012px) {
+    --pane-width-small: 256px;
+    --pane-width-medium: 296px;
+    --pane-width-large: 320px;
+  }
+
+  @media screen and (min-width: 1280px) {
+    --pane-width-large: 336px;
+    --pane-max-width-diff: 959px;
+  }
+
+  /* These following CSS variables are dynamic values that get overridden by styles passed in via props. */
+  --spacing: 0;
+  --spacing-row: 0;
+  --spacing-column: 0;
+  --spacing-divider: 0;
+  --offset-header: 0;
+  --sticky-pane-height: 0;
+  --pane-width: 0;
+  --pane-min-width: 0;
+  --pane-max-width: 0;
+  --pane-width-custom: 0;
+  --pane-width-size: 0;
+
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--spacing);
+}
+
+.PageLayoutWrapper {
+  display: flex;
+  margin-right: auto;
+  margin-left: auto;
+  flex-wrap: wrap;
+
+  &:where([data-width='medium']) {
+    max-width: 768px;
+  }
+
+  &:where([data-width='large']) {
+    max-width: 1012px;
+  }
+
+  &:where([data-width='full']) {
+    max-width: 100%;
+  }
+
+  &:where([data-width='xlarge']) {
+    max-width: 1280px;
+  }
+}
+
+.PageLayoutContent {
+  display: flex;
+  flex: 1 1 100%;
+  flex-wrap: wrap;
+  max-width: 100%;
+}
+
+.HorizontalDivider {
+  /* stylelint-disable-next-line primer/spacing */
+  margin-right: calc(-1 * var(--spacing-divider));
+  /* stylelint-disable-next-line primer/spacing */
+  margin-left: calc(-1 * var(--spacing-divider));
+
+  &:where([data-variant='none']) {
+    display: none;
+  }
+
+  &:where([data-variant='line']) {
+    display: block;
+    height: 1px;
+    /* stylelint-disable-next-line primer/colors */
+    background-color: var(--borderColor-default);
+  }
+
+  &:where([data-variant='filled']) {
+    display: block;
+    height: var(--base-size-8);
+    background-color: var(--bgColor-inset);
+    box-shadow:
+      /* stylelint-disable-next-line primer/box-shadow */
+      inset 0 -1px 0 0 var(--borderColor-default),
+      inset 0 1px 0 0 var(--borderColor-default);
+  }
+
+  @media screen and (min-width: 768px) {
+    margin-right: 0 !important;
+    margin-left: 0 !important;
+  }
+}
+
+.VerticalDivider {
+  position: relative;
+  height: 100%;
+
+  &:where([data-variant='none']) {
+    display: none;
+  }
+
+  &:where([data-variant='line']) {
+    display: block;
+    width: 1px;
+    /* stylelint-disable-next-line primer/colors */
+    background-color: var(--borderColor-default);
+  }
+
+  &:where([data-variant='filled']) {
+    display: block;
+    width: var(--base-size-8);
+    background-color: var(--bgColor-inset);
+    box-shadow:
+      /* stylelint-disable-next-line primer/box-shadow */
+      inset -1px 0 0 0 var(--borderColor-default),
+      inset 1px 0 0 0 var(--borderColor-default);
+  }
+}
+
+.Header {
+  width: 100%;
+  /* stylelint-disable-next-line primer/spacing */
+  margin-bottom: var(--spacing);
+}
+
+.HeaderContent {
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--spacing);
+}
+
+.HeaderHorizontalDivider {
+  /* stylelint-disable-next-line primer/spacing */
+  margin-top: var(--spacing);
+}
+
+.ContentWrapper {
+  display: flex;
+
+  /* Hack to prevent overflowing content from pushing the pane region to the next line */
+  min-width: 1px;
+  flex-direction: column;
+  order: var(--region-order-content);
+
+  /* Set flex-basis to 0% to allow flex-grow to control the width of the content region.
+      Without this, the content region could wrap onto a different line
+      than the pane region on wide viewports if its contents are too wide. */
+  flex-basis: 0;
+  flex-grow: 1;
+  flex-shrink: 1;
+
+  &:where([data-is-hidden='true']) {
+    display: none;
+  }
+}
+
+.Content {
+  width: 100%;
+
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--spacing);
+  margin-right: auto;
+  margin-left: auto;
+  flex-grow: 1;
+
+  &:where([data-width='medium']) {
+    max-width: 768px;
+  }
+
+  &:where([data-width='large']) {
+    max-width: 1012px;
+  }
+
+  &:where([data-width='full']) {
+    max-width: 100%;
+  }
+
+  &:where([data-width='xlarge']) {
+    max-width: 1280px;
+  }
+}
+
+.PaneWrapper {
+  display: flex;
+  width: 100%;
+  margin-right: 0;
+  margin-left: 0;
+
+  &:where([data-is-hidden='true']) {
+    display: none;
+  }
+
+  &:where([data-position='end']) {
+    /* stylelint-disable-next-line primer/spacing */
+    margin-top: var(--spacing-row);
+    flex-direction: column;
+    order: var(--region-order-pane-end);
+  }
+
+  &:where([data-position='start']) {
+    /* stylelint-disable-next-line primer/spacing */
+    margin-bottom: var(--spacing-row);
+    flex-direction: column-reverse;
+    order: var(--region-order-pane-start);
+  }
+
+  @media screen and (min-width: 768px) {
+    width: auto;
+    margin-top: 0 !important;
+    margin-bottom: 0 !important;
+
+    &:where([data-sticky]) {
+      position: sticky;
+      /* stylelint-disable-next-line primer/spacing */
+      top: var(--offset-header);
+      max-height: var(--sticky-pane-height);
+    }
+
+    &:where([data-position='end']) {
+      /* stylelint-disable-next-line primer/spacing */
+      margin-left: var(--spacing-column);
+      flex-direction: row-reverse;
+    }
+
+    &:where([data-position='start']) {
+      /* stylelint-disable-next-line primer/spacing */
+      margin-right: var(--spacing-column);
+      flex-direction: row;
+    }
+  }
+}
+
+.PaneVerticalDivider {
+  &:where([data-position='start']) {
+    /* stylelint-disable-next-line primer/spacing */
+    margin-left: var(--spacing);
+  }
+
+  &:where([data-position='end']) {
+    /* stylelint-disable-next-line primer/spacing */
+    margin-right: var(--spacing);
+  }
+}
+
+.Pane {
+  width: var(--pane-width-size);
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--spacing);
+
+  @media screen and (min-width: 768px) {
+    overflow: auto;
+  }
+
+  &:where([data-resizable]) {
+    width: 100%;
+
+    @media screen and (min-width: 768px) {
+      width: clamp(var(--pane-min-width), var(--pane-width), var(--pane-max-width));
+    }
+  }
+}
+
+.PaneHorizontalDivider {
+  &:where([data-position='start']) {
+    /* stylelint-disable-next-line primer/spacing */
+    margin-top: var(--spacing);
+  }
+
+  &:where([data-position='end']) {
+    /* stylelint-disable-next-line primer/spacing */
+    margin-bottom: var(--spacing);
+  }
+}
+
+.FooterWrapper {
+  width: 100%;
+  order: var(--region-order-footer);
+
+  /* stylelint-disable-next-line primer/spacing */
+  margin-top: var(--spacing);
+}
+
+.FooterHorizontalDivider {
+  /* stylelint-disable-next-line primer/spacing */
+  margin-bottom: var(--spacing);
+}
+
+.FooterContent {
+  /* stylelint-disable-next-line primer/spacing */
+  padding: var(--spacing);
+}