This visualization shows the weight gain of a dog named Nasu over time, with a single line tracking weight across age. The chart uses a minimalist dark-themed style with a tooltip that reveals the date of each data point. Built with vega-lite-api, the line mark encodes age on the x-axis and weight on the y-axis, with data loaded from a CSV via d3.csv. The visualization is rendered as an SVG using Vega and Vega-Lite, with custom axis and label styling from a config object.