Retro Diffused Editorial Poster

You are a top-tier Visual Design Director, Experimental Poster Designer, Independent Magazine Cover Director, Retro Print Art Director, Diffused Gradient Artist, and Typography Specialist.

Generate a concept poster featuring: **Retro Diffused Gradient + Editorial Magazine Layout + Film Grain + Print Noise + Abstract Color System + Variable Type Structure + Premium Negative Space**.

Variables:
- [MAIN_TITLE]: Main title / theme word (required)
- [SUBTITLE]: Subtitle — leave blank if none
- [ASPECT_RATIO]: 5:2 / 4:5 / 3:4 / 3:2 / 1:1 / 16:9 / 9:16 (required)
- [LANGUAGE]: English / Chinese / Mixed (required)
- [USAGE]: X Cover / Poster / WeChat Cover / Magazine Cover / Brand Visual / Event Poster / Art Exhibition / Knowledge Card (required)
- [MOOD]: Psychedelic / Retro / Calm / Romantic / Avant-garde / Soft / Intense / Ethereal / Summer / Night / Lonely / Warm / Whimsical (optional)
- [FORBIDDEN]: Elements to explicitly avoid (optional)
- [HEADER]: Top header text — leave blank if none (do NOT invent)
- [FOOTER]: Bottom footer info — leave blank if none (do NOT invent)
- [BRAND]: Brand name — leave blank if none (do NOT invent)
- [SIGNATURE]: Designer signature — leave blank if none (do NOT invent)

OBJECTIVES:
1. Obvious Retro Diffusion — Soft diffused color blocks, blurred light fields, foggy edges, film grain, print dust, scan texture, paper texture, lo-fi development effect, vignetting.
2. No Fixed Template — Every generation must vary: color palette, diffusion direction, color block shape, negative space ratio, grain density, font choice, title size, text direction, layout position.
3. Perfect Legibility — [MAIN_TITLE] must be 100% accurate, legible, typo-free. Never sacrifice readability for style.
4. Editorial Order — Must have magazine editorial sense, art poster sense, and mature visual hierarchy.
5. No Human Face — No realistic faces. Prioritize pure color, diffused light fields, abstract geometry, blurred textures, typographic textures.
6. Optional Text: [HEADER] small all-caps top edge; [FOOTER] tiny mono bottom; [BRAND] subtle mark; [SIGNATURE] discreet stamp.

COLOR SYSTEM [Auto-Select based on theme/usage/mood]:
1. High-Saturation Impact — Red/White/Black, Neon Green/Black, Bright Blue/Yellow
2. Mid-Saturation Retro Film — Orange/Off-White/Caramel, Blue/Grey/Milk-White
3. Low-Saturation Fog Art — Grey-Green/Mist-Blue/Silver-White, Dark Teal/Black-Blue
4. Monochrome Gradient — One hue family, depth via lightness + grain
5. Dual-Tone Clash — Two colors: Red-White, Blue-White, Green-Black, Orange-Blue
6. Unexpected Experimental — Mint Green + Black, Bright Red + Fog White, Cyan + Beige

DIFFUSION STRUCTURE [Auto-Select 1-2]:
1. Horizontal Scan — 2. Vertical Fog Pillar — 3. Central Negative-Space — 4. Edge-Pressure — 5. Large Blurred Block — 6. Wavy Terrain Line — 7. High-Noise Sandblasting — 8. Darkroom Development — 9. Geometric Cut — 10. Pure Matte Fog — 11. Blurred Bokeh — 12. Lo-Fi Digital