Barebone Baseline

postcss.config.mjs

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+import postcssGlobalData from '@csstools/postcss-global-data';
+import postcssImport from 'postcss-import';
+import postcssPresetEnv from 'postcss-preset-env';
+
+export default {
+  plugins: [
+    postcssGlobalData({
+      files: ['./src/styles/custom-media.css'],
+    }),
+    postcssImport(),
+    postcssPresetEnv({
+      stage: 2,
+      features: {
+        'custom-media-queries': true,
+        'nesting-rules': true,
+        'media-query-ranges': true,
+      },
+    }),
+  ],
+};