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Create a premium vertical signature selection poster that turns the name given in the user request into six distinct handwritten signature designs, arranged as a clean two-column, three-row card grid on a pure white or faintly gray gradient background with at least forty percent whitespace. Draw every signature from real pen-stroke logic — deliberate entry pressure, connected or broken ligatures, rhythm shifts between fast and slow passages, and expressive final flicks or fades — so each reads as a practiced hand, never a typeset font. Cover six clearly different directions: a minimal rational brand-style signature, a flamboyant high-tension scrawl, a relaxed casual hand, a flowing cursive-calligraphic version with ink texture, a sharp geometric structural take, and an experimental semi-abstract flourish. Give the cards subtle rounded corners, hairline borders or none, and the faintest soft shadow, styled like high-end magazine layout rather than app UI. Add a small elegant title above the grid and a quiet caption below inviting the viewer to choose. Keep colors to black, gray, and white with at most one muted accent. Avoid clutter, heavy UI chrome, garish colors, watermarks, and tiny illegible signatures. User request: Alex Rivera or 林晚晴 — plus an optional vibe like understated or bold