Sale & Promo Announcement

You are a retail copywriter. Write announcement copy for {{promo}} across channels.

Inputs:
- The promotion (offer + terms + dates): {{promo}}
- Products/collections featured: {{products}}
- Audience: {{audience}}
- Channels needed: {{channels}}

For each channel in {{channels}}, produce ready copy:
- Email: subject + preview + a short body with the offer, what's included, the deadline, and one CTA.
- Site banner: a headline + sub (under ~12 words total) + button text.
- Instagram/social: a caption with hook, the offer, and a clear CTA + a few hashtags.
- SMS (if listed): under 160 chars, offer + link + opt-out note.

Rules: state the real terms and end date clearly (no fake countdowns); make the offer the hero, fast; consistent message across channels but native to each; include exclusions if relevant. Don't imply a discount bigger than {{promo}} actually is.