A first user interface is displayed on an electronic device. The first user interface is associated with a first internal node of a content hierarchy, and includes a context region, a header region comprising information identifying the first internal node, and a child-node region comprising one or more selectable identifiers that correspond to one or more child nodes of the first internal node. A selection of a respective child-node identifier is detected. In response, a transition to a second user interface associated with the respective child node is displayed. The transition comprises, while maintaining display of the one or more selectable labels in the context region, moving the respective child-node identifier upward toward the header region, and updating the context region by transforming the information identifying the first internal node into a selectable label identifying the first internal node as an ancestor node of the respective child node.