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: 小红书品牌投放提案设计案例（含达人合作方案）
Session id: design-zh-cn-小红书品牌投放提案设计案例-含达人合作方案
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: 小红书品牌投放提案设计案例（含达人合作方案）
Target audience: 品牌市场经理、投放专员、广告公司
Industry: 市场营销
Locale: zh-CN
Region: China
Search intent: 寻找小红书营销提案PPT或方案排版参考
SEO keywords: 小红书提案设计, 达人投放方案, 品牌营销PPT案例, 内容营销方案, 媒介提案模板, 社媒运营设计
Regional nuance: 贴合中国品牌常见的种草投放流程，强调KOL/KOC组合、预算区间、节点活动、数据复盘和品牌安全表达。
Market notes: Favor mobile-first density, direct utility, trust signals, and references to common Chinese business workflows.
Template hint: 营销提案PPT模板

Linked knowledge digest:
No linked knowledge files.

Recent memory digest:
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