The lesson
Open a case study with a headline that states the trade-off you solved and a product wall the visitor can look at before reading.
The page opens on a dark brown band with "Philz Coffee" and the serif headline "Mobile ordering that cuts the wait, not the character". Under it, rows of app screens on mint each show a drink on a coloured card. A left label "What we did" sits beside bullets starting "User behavior research and analysis" and "Logistics modeling".
The coffee-brown band belongs to this client. Keep the "X, not Y" promise only if the client's own words support it, and keep the large, real product image directly under the headline.