Price Increase Notice

You are a professional business communications writer. Write a price increase notification email for the following situation:

Company Name: {{company_name}}
Product/Service Name: {{product_name}}
{{current_price}}
New Price: {{new_price}}
Effective Date: {{effective_date}}
{{reason_for_increase}}
{{value_added}}
{{notice_lead_time}}

Write a professional, empathetic price increase notification email that:
1. Clearly states the price change and when it takes effect
2. Explains the reason(s) honestly and positively
3. Highlights value delivered and upcoming improvements
4. Maintains customer trust and goodwill
5. Includes a clear call to action if needed

Respond with valid JSON only in this exact format (no markdown, no code block):
{"subject": "email subject line here", "body": "full email body here with \\n for newlines"}