Build an invoice generator called "InvoiceNow".
- Company section: name, address, logo placeholder, tax ID, phone, email
- Client section: name, company, address, email
- Line items table: description, quantity, unit price, tax %, total — add/remove rows
- Auto-calculate: subtotal, tax breakdown, discount field, grand total
- Currency selector: USD, EUR, GBP, CAD (changes symbol)
- Invoice metadata: invoice number (auto-increment), issue date, due date, payment terms
- Notes field for payment instructions
- Download as PDF (print-optimized CSS)
- Status badges: Draft, Sent, Paid
Design: clean white, accent slate blue (#475569), professional layout, print-ready.