You have some neat SVG icons already, I urge you to refactor them so they are not 'design assets' but fully fledged and fully yours. The exercise of doing them will give you a new string to your bow for solving visual problems. SVGs are like LEGO but a lot more fun, so long as you play with them properly rather than just use ready mades. So same as LEGO then...

Once you have done a small set, e.g. your dozen ones, you will be able to have more of this design flexibility, plus you will discover that creative drawing is not actually what usually goes on with Adobe style applications but goes up to a whole new level when you do SVG - because it is code.

If embedding SVGs has cool factor, you can make them fully presentational by putting them in CSS custom variables and then using those custom variables in pseudo elements. This is how I do external links, download links etc.

The only downside is that you can't radically change the colours on mouseover etc.

https://css-tricks.com/solved-with-css-colorizing-svg-backgr...

Also Google Lea Verou if you want to take pride in your SVGs.

To add to your refactoring list, have one stylesheet with everything that changes depending on screen size set as a CSS variable. So at the top have a big list of 'things that change' and the defaults for any screen size. So if you have margin size for instance, set it there for mobile, then, have a media query below the base list of css variables and then update the variable in the media query block. Try to have zero CSS rules in the media queries, have it exclusively setting CSS variables.

If you do it this way then you can tell from the CSS where something changes because it has a CSS variable. Done the old way with chunks of CSS in media queries you can't see at a glance if there is more than one place a given rule is defined, done the new way it can be maintained a lot easier.

A final thing - you have a lot of table information and CSS grid is absolutely excellent for showing tables. You don't have to explicitly write out all cells, unlike with tables, you can make things with a given class or other attribute go in the correct column keeping your source data semantically neat even if some records do not contain all the fields. Rather than classes you could mark up your 'papers' and references with things like 'cite' tags, 'address' tags or whatever is bestest HTML5 and have these flow into the correct columns without using classes or tables, just a succinct css grid declaration and that is it. The grid layout is much better for speed so you will like it.