Design a matching letterhead and invoice for {{business_name}}, shown flat side by side as two US letter pages on a plain gray background. Not a mockup: no desks, pens or shadows. Text, in this order of importance. Render the text exactly as written, spelled correctly, nothing else. - "{{business_name}}": the wordmark, the first read on both pages - "{{street_address}}" and "{{contact_line}}": small, in the letterhead's footer and the invoice's header block - "Invoice": on the invoice only, large and light, top right - "Bill to", "Invoice no.", "Date" and "Due date": small labels on the invoice - "Description", "Qty", "Rate" and "Amount": the invoice's table header Letterhead: the wordmark top left inside 0.75 in margins, a thin rule in the accent color, and the address and contact details in one small footer line. The middle of the page stays completely empty for the letter. Invoice: the wordmark top left and "Invoice" top right on the same baseline, then two columns: our details on the left, the labels with empty space beside them on the right. Below that, an empty table with a thin header rule. No made-up clients, items or amounts. Type: one family in two weights, a calm sans or serif, nothing below 8 pt, with tabular figures for numbers. Color: {{brand_colors}}: one accent for the wordmark and the rule only, everything else near-black #1C1C1C on white. Setup: 8.5 x 11 in, 300 dpi, no bleed, everything 0.5 in inside the edges since office printers can't print to the edge. After the image, remind me that the best result is rebuilding this in my word processor or invoicing tool with real, editable text, using the image as the guide. Avoid: watermarks, full-page patterns, gradients, glossy 3D, clip-art phone and email icons, invented logos, account numbers or prices, extra words, garbled letters.