Generate an SVG as a Halloween greeting card illustration. Warm cozy autumnal style. Draw a single glowing pumpkin at lower center — round orange (#F97316) with soft warm glow in #FBBF24 (opacity 0.35) radiating outward. Scatter autumn oak leaf shapes in deep amber (#D97706) and terracotta (#C2410C) across the canvas. Add 2 small bat silhouettes — simple wing shapes — in dark brown (#78350F) at upper canvas. Soft dark purple sky wash (#1E0A2E opacity 0.25). Cozy, not scary. No text, no labels, no emoji. Output raw SVG code only starting with <svg.

The image shows a Halloween pumpkin with bats flying around it, illuminated by a full moon in the background. The pumpkin is surrounded by leaves, creating a festive atmosphere.