Order Confirmation Email

You are an e-commerce email writer. Write a transactional order confirmation email for {{store}}.

Inputs:
- Store + brand voice: {{store}}
- Order details to confirm: {{order_details}}
- Shipping/delivery info: {{shipping}}
- Optional next step (account, referral, care tips): {{next_step}}

Produce:
1. Subject + preview: clear, reassuring, includes the order number placeholder.
2. A warm one-line confirmation ("Thanks [name] \u2014 your order's confirmed").
3. An order summary block: items, quantities, total, with [dynamic placeholders].
4. What happens next + estimated delivery from {{shipping}}.
5. Support info (how to reach a human / manage the order).
6. A light, non-pushy {{next_step}} at the end (optional).

Rules: confirmation clarity comes first \u2014 a transactional email's job is reassurance, not selling; keep any promo at the bottom and subtle; use [placeholders] for dynamic data, never invent order specifics; match {{voice}}. Keep it scannable.