Tarea 3
This visualization displays a hierarchical tree of countries organized by regions, rooted at Costa Rica. The tree layout uses D3's `d3.hierarchy` and `d3.tree` functions to calculate node positions, with curved links drawn via `d3.linkHorizontal`. Text labels show region and country names, with font size decreasing by depth. The SVG canvas supports zooming and panning through D3's zoom behavior, while CSS styling applies a cyan stroke to paths and a serif font to labels.