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+# Justfile for Marp presentations
+
+# Default command
+default:
+    just help
+
+# Show help
+help:
+    @echo "Commands:"
+    @echo "  build <file>    - Build HTML"
+    @echo "  watch <file>    - Watch and rebuild"
+    @echo "  pdf <file>      - Export to PDF"
+    @echo "  new <name>      - Create presentation"
+    @echo "  clean           - Remove output files"
+    @echo "  demo            - Build demo presentations"
+    @echo ""
+    @echo "Themes: acarp (16:9), acarp-beamer (4:3)"
+    @echo "Layouts: title, layout-2col"
+
+# Install dependencies
+install:
+    npm install
+
+# Check if dependencies are installed, install if needed
+deps:
+    @if [ ! -d "node_modules" ] || [ ! -f "package-lock.json" ]; then \
+        echo "Installing dependencies..."; \
+        npm install; \
+    fi
+
+# Build HTML from markdown
+build file: deps
+    npx marp --config .marprc.json --html {{file}}
+
+# Watch markdown file and rebuild on changes
+watch file: deps
+    npx marp --config .marprc.json --watch {{file}}
+
+# Convert to PDF
+pdf file: deps
+    npx marp --config .marprc.json --pdf --browser chrome {{file}}
+
+# Build and open HTML file
+build-open file: (build file)
+    #!/usr/bin/env sh
+    html_file="$(echo "{{file}}" | sed 's/\.md$/.html/')"
+    echo "Opening $html_file..."
+    if command -v xdg-open > /dev/null; then
+        xdg-open "$html_file"
+    elif command -v open > /dev/null; then
+        open "$html_file"
+    elif command -v start > /dev/null; then
+        start "$html_file"
+    else
+        echo "Could not find a command to open files"
+    fi
+
+# Create new presentation from template
+new name:
+    @cp template.md "{{name}}.md"
+    @echo "Created {{name}}.md"
+
+# Clean output files
+clean:
+    @rm -f *.html *.pdf *.pptx
+
+# Build demo presentations
+demo:
+    @echo "Building demo-standard.md..."
+    npx marp --config .marprc.json --html demo-standard.md
+    @echo "Building demo-beamer.md..."
+    npx marp --config .marprc.json --html demo-beamer.md
+    @echo "Demo files built successfully!"
+
+build-open-all:
+    #!/usr/bin/env sh
+    # Build all files first
+    for file in *.md; do
+        if [ -f "$file" ]; then
+            echo "Building $file..."
+            theme=$(if echo "$file" | grep -q "beamer"; then echo "acarp-beamer"; else echo "acarp"; fi)
+            npx marp --theme "$theme" --theme-set acarp.css --theme-set acarp-beamer.css --allow-local-files --html "$file"
+        fi
+    done
+    # Then open all HTML files
+    echo "Opening all HTML files..."
+    for file in *.html; do
+        if [ -f "$file" ]; then
+            if command -v xdg-open > /dev/null; then
+                xdg-open "$file" &
+            elif command -v open > /dev/null; then
+                open "$file"
+            fi
+        fi
+    done