1.6.0

Fix and enhance the concrete calculation
Minify the about.css file

build.js

@@ -38,6 +38,7 @@ function cleanDist() {
     path.join(DIST,   'index.html'),
     path.join(DIST,   'about.html'),
     path.join(ASSETS, '_tmp_flat.css'),
+    path.join(ASSETS, 'about.min.css'),
   ];
   for (const f of targets) {
     try { fs.unlinkSync(f); } catch (_) { /* ok if missing */ }
@@ -145,12 +146,22 @@ async function build() {
     console.log('    -> ' + htmlFile);
   }
 
-  // 5. Copy standalone CSS files that are not part of the main bundle
-  for (const f of ['about.css']) {
-    const src = path.join(ROOT, 'assets', f);
+  // 5. Minify standalone CSS files that are not part of the main bundle
+  // src name -> output name
+  const standaloneCSS = [['about.css', 'about.min.css']];
+  for (const [srcName, outName] of standaloneCSS) {
+    const src = path.join(ROOT, 'assets', srcName);
     if (fs.existsSync(src)) {
-      copyFile(src, path.join(ASSETS, f));
-      console.log('    -> assets/' + f);
+      fs.mkdirSync(ASSETS, { recursive: true });
+      await esbuild.build({
+        entryPoints: [src],
+        bundle:      false,
+        minify:      true,
+        outfile:     path.join(ASSETS, outName),
+        logLevel:    'warning',
+      });
+      const sz = fs.statSync(path.join(ASSETS, outName)).size;
+      console.log('    -> assets/' + outName + ' (' + (sz / 1024).toFixed(1) + ' KB minified)');
     }
   }