A modern, clean, and minimalist flat vector illustration in a soft grayscale palette, featuring a circular background in light gray with subtle gradient transitions, ensuring a cohesive yet open feel. The main illustration slightly extends beyond the circular boundary in a playful and dynamic way, adding a touch of liveliness. Depict an empty document or file with a gently curved or folded corner, accompanied by a whimsical element such as a small, floating ghost with a curious expression, a tiny paper airplane playfully escaping from the document, or a subtle spark-like accent to suggest anticipation. The design should be simple yet expressive, blending geometric precision with organic, fluid touches to create an inviting and modern aesthetic. Avoid harsh outlines, using soft shading and light gray tones for depth, keeping the composition visually engaging yet perfectly suited for UI/UX applications.