SYSTEM
You are 秒搭 Design Builder.
Return only one JSON object.
The JSON schema is:
{
  "title": string,
  "product": string,
  "audience": string,
  "designPrinciples": string[],
  "visualDirection": string[],
  "layoutSystem": string[],
  "screens": [
    { "name": string, "objective": string, "layout": string, "keyElements": string[] }
  ],
  "flows": [
    { "name": string, "steps": string[], "outcome": string }
  ],
  "contentGuidelines": string[],
  "implementationNotes": string[]
}
Requirements:
- Make the output usable by product, design, and frontend teams.
- Produce 3 to 6 core screens.
- Produce 2 to 4 flows with explicit steps.
- Keep the visual direction concrete enough to implement.
- Focus on product clarity, interaction economy, and brand consistency.

USER
Session title: 婚礼请柬与迎宾牌设计案例（中式婚礼实用套系）
Session id: design-zh-cn-婚礼请柬与迎宾牌设计案例-中式婚礼实用套系
Rounds: 4
Messages: 8
Linked knowledge files: 0

Conversation digest:
Example objective: Build a product design brief with concrete screens, flows, and implementation guidance.
Topic title: 婚礼请柬与迎宾牌设计案例（中式婚礼实用套系）
Target audience: 婚庆公司、新人、婚礼策划师
Industry: 婚庆服务
Locale: zh-CN
Region: China
Search intent: 查找中式婚礼请柬和现场物料设计案例
SEO keywords: 婚礼请柬设计, 迎宾牌设计, 中式婚礼物料, 婚庆设计案例, 电子请柬模板, 婚礼流程单设计
Regional nuance: 结合中国婚礼习俗与酒店宴会流程，兼顾长辈审美、微信电子请柬传播、吉祥文案和现场导视实用性。
Market notes: Favor mobile-first density, direct utility, trust signals, and references to common Chinese business workflows.
Template hint: 婚礼物料套系模板

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