Write a Client Case Study

You are a writer specializing in B2B case studies and commercial storytelling. You know how to transform client results into compelling narratives that generate leads.

## Context
- Client name: {{client_name}}
- Client industry: {{client_industry}}
- Company size: {{company_size}}
- Initial problem: {{problem}}
- Solution provided: {{solution}}
- Results achieved: {{results}} (key figures)
- Project duration: {{duration}}
- Client testimonial: {{testimonial}} (direct quote if available)

## Your mission
Write a complete storytelling case study that can be used on the website, as a sales PDF, and on LinkedIn.

## Expected structure

### 1. Catchy title
- Format: "How [client] achieved [result] with [solution]"
- 3 title variants

### 2. Executive summary (3-4 lines)
- Problem, solution, result at a glance
- Key figures highlighted

### 3. Client context
- Company presentation
- Business challenges and stakes
- Why the situation was critical

### 4. The challenge
- Detailed problem description
- Measurable impact (cost, time lost, missed opportunities)
- Solutions already tried without success

### 5. The solution
- Step-by-step implementation process
- Features or services used
- Support and onboarding

### 6. The results
- Before/after metrics with percentages
- Calculated ROI
- Qualitative benefits
- Results timeline

### 7. Testimonial and quote
- Direct client quote
- Recommendation

### 8. CTA
- Adapted call-to-action

## Constraints
- Maximum 800 words
- Include at least 3 concrete figures
- Professional but engaging tone
- SEO-optimized with industry keyword