How to implement this functionality using SVG?

Question

css

Good afternoon! Tell me, please, how can I implement exactly the appearance and disappearance of the blue elements of the SVG chart as in the video ? I ask you to push for a solution, css properties through which you can do this. No ideas yet..
The SVG itself

<svg width="926" height="707" viewBox="0 0 926 707" fill="none" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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      <line y1="-2.5" x2="94" y2="-2.5" transform="matrix(-1 0 0 1 162 81)" stroke="#E7E7E7" stroke-width="5"/>
      <circle r="10" transform="matrix(-1 0 0 1 64 78)" fill="#E7E7E7"/>
      <circle r="5" transform="matrix(-1 0 0 1 64 78)" fill="white"/>
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      <line y1="-2.5" x2="94" y2="-2.5" transform="matrix(1 0 0 -1 768 661)" stroke="#E7E7E7" stroke-width="5"/>
      <circle r="10" transform="matrix(1 0 0 -1 866 664)" fill="#E7E7E7"/>
      <circle r="5" transform="matrix(1 0 0 -1 866 664)" fill="white"/>
      <line id="line3" y1="-2.5" x2="150" y2="-2.5" transform="matrix(1 0 0 -1 768 371)" stroke="#E7E7E7" stroke-width="5"/>
      <circle r="10" transform="matrix(1 0 0 -1 916 374)" fill="#E7E7E7"/>
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      <line x1="688.613" y1="131.92" x2="769.613" y2="77.9199" stroke="#E7E7E7" stroke-width="5"/>
      <line x1="768" y1="78.5" x2="862" y2="78.5" stroke="#E7E7E7" stroke-width="5"/>
      <path d="M876 78C876 83.5228 871.523 88 866 88C860.477 88 856 83.5228 856 78C856 72.4772 860.477 68 866 68C871.523 68 876 72.4772 876 78Z" fill="#E7E7E7"/>
      <circle cx="866" cy="78" r="5" fill="white"/>                
</svg>

Answer 1

Read how to make handwritten text on SVG https://css-tricks.com/animate-calligraphy-with-svg/

Answer 2

I would make the segments of the diagram stroke, without filling - then you can safely apply manipulations with stroke-dashoffset, directly affecting these segments.
In the example, I gave them a common class, and separate id, in case you also need to manipulate a specific segment on click or hover of some link. Here, hover on the .line6-link class link acts through the + selector on the next segment with the line6 id - this is just an example, as you can see, the link is embedded in svg. If in a real project the links are taken out of svg, then it will not be possible to influence so easily, it will most likely be necessary to use js.