first working full version

Makefile

@@ -1,5 +1,11 @@
 QUARTO ?= quarto
 
+# Allow overriding the list of docx outputs via env var `docx`.
+# Example: `make docx docx="index Supplements"` or `make docx docx=index`.
+DOCX ?= index Supplements
+DOCX := $(if $(docx),$(docx),$(DOCX))
+DOCX_DOCS := $(addsuffix .docx,$(DOCX))
+
 .PHONY: all pdf docx clean
 
 # Build both formats for both documents
@@ -7,7 +13,8 @@ all: pdf docx
 
 # Aggregate targets
 pdf: index.pdf Supplements.pdf
-docx: index.docx Supplements.docx
+docx: $(DOCX_DOCS)
+docx-main: index.docx
 
 # Pattern rules for either format
 %.pdf: %.qmd