sudirectories for svg and pdf

Makefile

@@ -2,28 +2,31 @@
 TEX_DIR = tex
 ROOT_DIR := $(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
 OUTPUT_DIR = $(ROOT_DIR)/output
+PDF_OUTPUT_DIR = $(OUTPUT_DIR)/pdf
+SVG_OUTPUT_DIR = $(OUTPUT_DIR)/svg
 BUILD_DIR = $(ROOT_DIR)/build
 
 # List of .tex files in the TEX_DIR that do not start with an underscore
 TEX_FILES := $(wildcard $(TEX_DIR)/*.tex)
 TEX_FILES := $(filter-out $(TEX_DIR)/_%.tex, $(TEX_FILES))
-PDF_FILES := $(patsubst $(TEX_DIR)/%.tex, $(OUTPUT_DIR)/%.pdf, $(TEX_FILES))
-SVG_FILES := $(patsubst $(TEX_DIR)/%.tex, $(OUTPUT_DIR)/%.svg, $(TEX_FILES))
+PDF_FILES := $(patsubst $(TEX_DIR)/%.tex, $(PDF_OUTPUT_DIR)/%.pdf, $(TEX_FILES))
+SVG_FILES := $(patsubst $(TEX_DIR)/%.tex, $(SVG_OUTPUT_DIR)/%.svg, $(TEX_FILES))
 
 # Latex compilation command with BUILD_DIR for intermediate files
 LATEXMK = latexmk -cd -pdf -shell-escape -outdir=$(BUILD_DIR) -auxdir=$(BUILD_DIR)
 
 # Rule to compile all .tex files to .pdf and .svg
 all: $(PDF_FILES) $(SVG_FILES)
 
-# Individual PDF file compilation, moving final PDF to OUTPUT_DIR
-$(OUTPUT_DIR)/%.pdf: $(TEX_DIR)/%.tex
-	@mkdir -p $(OUTPUT_DIR) $(BUILD_DIR)
+# Individual PDF file compilation, moving final PDF to PDF_OUTPUT_DIR
+$(PDF_OUTPUT_DIR)/%.pdf: $(TEX_DIR)/%.tex
+	@mkdir -p $(PDF_OUTPUT_DIR) $(BUILD_DIR)
 	$(LATEXMK) $<
-	@mv $(BUILD_DIR)/$*.pdf $(OUTPUT_DIR)/
+	@mv $(BUILD_DIR)/$*.pdf $(PDF_OUTPUT_DIR)/
 
-# Convert each PDF to SVG using pdf2svg
-$(OUTPUT_DIR)/%.svg: $(OUTPUT_DIR)/%.pdf
+# Convert each PDF to SVG using pdf2svg, placing SVGs in SVG_OUTPUT_DIR
+$(SVG_OUTPUT_DIR)/%.svg: $(PDF_OUTPUT_DIR)/%.pdf
+	@mkdir -p $(SVG_OUTPUT_DIR)
 	pdf2svg $< $@
 
 # Clean command to remove generated files in OUTPUT_DIR and BUILD_DIR