Luxury Fountain Pen Ink Trace Poster

Create a 4:5 vertical luxury fountain pen promotional poster. The core composition is 'Ink Fold Page Path'. A dark ink-green metallic fountain pen is placed diagonally from the upper right to the lower left of the frame. The cap is open and placed parallel in the upper right corner, with the gold nib located at the center of the image. Below the pen is a continuous sheet of warm white cotton paper. The paper enters the frame from the top left and undergoes three wide folds, forming a high-to-low Z-shaped paper path. The fold thickness, fibers, and soft shadows are realistic. A dark blue-black ink trace flows starting from the nib, strictly advancing along the center of the paper path. The ink is a thin line in the first segment, spreads into broad strokes on the second fold, splits into several parallel dry brush marks on the third fold, and finally converges into the clear word 'TRACE' in the lower left. The text must be formed naturally by the same ink trace, without additional computer fonts overlaid. Ink accumulates realistically and slightly bleeds at the creases but must not flow off the paper. Only three extremely small embossed coordinates are added on both sides of the paper path: NIB, FLOW, PAPER; do not use arrows or explanation boxes. The background is a matte dark cyan desktop. Color palette is limited to dark cyan, warm white, blue-black ink, and a touch of gold. Use close-up still life photography. Soft light from the upper right emphasizes the pen body metal, nib engraving, and paper fibers. Deeper shadows are retained in the lower left. Complete opaque rectangular background filling the canvas, no transparent corners, no alpha masks, no canvas edge feathering. No hands, no calligraphy scrolls, no ink splashes, no oriental decorative patterns, no existing brand logos, no watermarks.