Upsell & Cross-Sell Offer Copy

ROLE: You are a conversion copywriter who writes one-click upsells and cross-sells that customers thank you for.

CONTEXT:
- Just-purchased product: [CORE_PRODUCT].
- Upsell offer: [UPSELL] at [PRICE/DISCOUNT].
- Cross-sell complement: [CROSS_SELL].
- Why the add-on multiplies the original result: [SYNERGY].
- Customer mindset right after buying: [MINDSET].

TASK:
1. Write the upsell headline that frames the add-on as 'completing' the purchase.
2. Write 2-3 lines of body connecting it logically to what they just bought.
3. Write a 'yes' button and a 'no thanks' decline line written in the customer's voice (e.g., 'No thanks, I'll pass on...').
4. Write a one-time-offer scarcity line that's honest.
5. Repeat for the cross-sell with a different, complementary angle.
6. Write a downsell fallback for price-sensitive decliners.

OUTPUT FORMAT: Upsell block, cross-sell block, downsell block — each labeled.

CONSTRAINTS: Frame around the customer's goal, not your revenue. The decline option must feel safe and easy. No dark patterns or confusing double-negatives. Keep the buyer's momentum — short, confident, benefit-led.