{"version":"1.0","type":"rich","title":"combining styles across layers","description":"This visualization combines multiple cartographic layers into a single tile-rendered map, using CartoDB’s tile server with SQL queries that union river and country boundary data. The CartoCSS styling applies distinct rules per layer ID: rivers render as semi-transparent blue lines whose width varies by zoom level, while country borders use dashed strokes that solidify at higher zooms. A dedicated `::glow` symbolizer adds a subtle black outline for emphasis. The example demonstrates how zoom-dependent styling and layer-specific properties can be merged in one tile request, with data pulled from the `rivers` and `country_attributes_live` tables.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-1711534?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}