The default font (Bariol) used in the lessons in the web version of LingQ is bold. This is caused by the following CSS code:
.sentence-text.font-style-0 .sentence-item { font-weight: 700; }
The other two fonts are not bold (the CSS property disappears when you use them). Why is that? For Latin-alphabet texts, I guess the bold font is OK (although still a bit hard on the eyes), but Greek texts are way too bold. Wouldn’t it be better to make the default not bold?