Generate a bright and clean image poster based on a specific theme: the first sight of the image is occupied by an oversized core glyph, totem, or symbol derived from the theme in the mid-background, with the glyph pressing down on the visual center in heavy flat blocks; the real theme protagonist or main body enters from the foreground and obscures part of the symbol, forming a strong memory point where the protagonist overlaps with the giant information background pattern. The background maintains a large area of high-brightness white space, with thin line frames, serial numbers, date-style small text, vertical short sentences, and bill/stamp-style information layers arranged around the edges; the text serves only as a rhythmic and ritualistic structure, not competing with the main body. The protagonist's posture should have a bit of playful interaction, and local accessories or hand-held objects should extend from the same information system, making the subject, symbol, border, and small text look like the same custom ID card or invitation poster. Colors are extracted from the material, emotion, and cultural semantics of the theme itself: the large area of base color remains bright, clear, clean, and airy, structural shadows are used for subject contours and layers, and a small amount of high-saturation accent colors are concentrated on the core symbol, borders, and information points, forming a cheerful, clear, and ritualistic bright color scale; the accent color changes with the theme, but must maintain the relationship of wide base color, heavy symbol, dense small text, and solid foreground. The overall texture is a combination of studio-like clear lighting, flat printed graphics, slight paper texture, and retro bill order, avoiding cluttered decoration and dirty/old/dim tones, ensuring the huge symbol is read first, followed by the foreground protagonist, and finally the surrounding dense information rhythm.

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Change the scene to: A new couple's wedding 'Xi' (Double Happiness) poster, a huge red '囍' as the background symbol, the groom and bride interacting in the foreground.
For social media: Wedding invitation preview or marriage registration commemoration, maintaining bright white space and ticket-style small text.
Size: Vertical 9:16, retaining red and white main colors and a relaxed, playful posture.