Generate a vertical "custom illustrated invitation card" from the invitation brief below.

Invitation brief: {{invitation_brief}}
Main title: {{main_text}}
Visual style: {{visual_style}}

The goal is for viewers to immediately understand what they are being invited to, and to feel that the card is worth sharing or saving. It should look like a custom invitation ready for a group chat, social post, direct message, or event page, not like a generic promotional poster, pure illustration, dense infographic, business deck cover, or formal notice.

First understand the invitation brief, then rewrite the loose material into short visual-reading copy. The main title "{{main_text}}" must be the clearest text on the card. Keep only 2 to 4 very short supporting details, such as invitees, place, time, activity, mood, or one light invitation line. Do not paste the full brief into the image. Text must be short, clearly grouped, and as readable as possible. A little handwriting or decorative lettering is fine, but avoid gibberish, tiny text walls, and long paragraphs.

Use a vertical invitation-card composition: the main title sits near the top or upper middle, the central area contains the event-related illustrated visual, and a small amount of supporting information sits near the bottom or side. The whole card needs clear whitespace, a border or card edge, decorative lines, light icons, small hand-drawn props, and a complete shareable layout. Let "{{visual_style}}" guide linework, color, material, and ratio. If no style is specified, use a bright, friendly, polished illustrated-card style with a warm handmade touch.

The illustration must be derived from the current invitation. A food invitation may include food, city cues, a table, or street stalls. A wedding invitation may include flowers, rings, outfit silhouettes, or paper craft details. A product launch may include the product, stage lights, display plinths, or brand-like staging. A fictional-world event should preserve recognizable characters, places, elements, festivals, props, or world signals. Do not carry over sample-specific props such as Changsha street food, lanterns, or garden motifs into unrelated themes.

The tone may be playful, romantic, formal, or professional, but it must fit the current invitation. You may add one short witty or emotional invitation line, but do not invent specific dates, addresses, hosts, QR codes, ticket prices, identities, or promises that the brief did not provide. If the brief does not include time or place, use vague phrases such as "see you tonight", "this weekend", "online", or "let's go" instead of fabricating details.

If the invitation involves real people, brands, public events, or sensitive identities, reduce impersonation and misinformation risk: do not create official statements, fake tickets, fake credentials, fake QR codes, fake brand logos, or anything that looks like a formal notice from a real institution. The image should feel like a private custom invitation or creative event card.

The final image should feel complete: readable title, appealing main visual, uncluttered supporting details, theme-relevant decoration, and a polished invitation-card layout. Avoid long-text layouts, unrelated illustration, generic ad posters, dense tiny text, QR codes, logos, watermarks, wrong dates, fake official styling, clipped text, gibberish, low resolution, broken faces, bad hands, and extra limbs.