/* ========================================================================= Site header (v6). The same header on every page. Four doors, always in the same place: Aviation, Hospitality, Private Office and About. Each opens a short dropdown listing that page's sections in the order they appear on the page, plus the guides and sources linked from inside it ("Go deeper"). One action: the enquiry button. Desktop: the label is a link to the page; the chevron beside it (or a hover) opens the dropdown. Phones: the four doors sit on their own row and the menu button opens the same lists as an accordion. The header is a