Dear, contest holder. Here I attach my work for your A4 Letterhead design. For the header, I tried to match with apple.com style, with little change on the color to fit on your color identity. For the footer, I also inspired by the footer of apple's web, having minimalistic, clean, yet still looks elegant. As your instruction, I use Lato font to fit your web and your PDF attached. In addition, I attached some previews if my design would be used on your PDF. Any feedback is appreciated. Thank you.