Klaviyo Win-Back Segmentation & Flow Builder

I want to build a win-back email flow in Klaviyo to re-engage lapsed customers. Please help me design the full flow strategy and copy framework.

Brand context:
- Brand name: [BRAND_NAME]
- Product category: [PRODUCT_CATEGORY] (e.g., skincare, supplements, apparel)
- Average order value: [AOV]
- Typical repurchase interval: [REPURCHASE_INTERVAL] (e.g., 45 days for consumables, 90 days for apparel)
- Definition of lapsed customer: [LAPSE_DEFINITION] (e.g., purchased at least once but no purchase in 90+ days)
- Primary win-back offer available: [WINBACK_OFFER] (e.g., 15% off, free shipping, gift with purchase)
- Brand voice: [BRAND_VOICE] (e.g., warm and conversational, bold and direct, premium and minimal)

Please produce:
1. Klaviyo Segment Definition -- The exact segment logic to build in Klaviyo (conditions, time windows, exclusions) for the win-back audience
2. Flow Architecture -- A 4-6 email flow with timing, trigger conditions, and branch logic (e.g., opened vs did not open)
3. Subject Line Variants -- 3 subject line options per email (curiosity, direct offer, and social proof angles)
4. Email Copy Framework -- For each email: a one-sentence preview text, a 2-3 sentence body hook, and a CTA button label
5. Suppression Rules -- Which profiles to exclude from the flow (e.g., active VIP subscribers, recent purchasers, unengaged >365 days)
6. Success Metrics -- The 3 KPIs to track in Klaviyo to measure flow performance and when to consider the flow successful

Write for an email marketer who knows Klaviyo but wants a strategic framework, not just copy.