Fix
A focus ring you can actually see
Tabbing through Thinkr now shows a solid outline on the focused button, link, or switch, and an off switch no longer fades into the page.
If you move through Thinkr with the keyboard, the control you land on is now marked with a solid 2px blue outline. Before, the only marker was a faint tinted halo at about 1.4:1 contrast against the page, which is below the 3:1 that accessibility guidelines ask for and easy to lose on a bright screen. The halo is still there; the outline is what you'll see.
Switches that are off were also too close to the page colour. The off track is now a mid grey (4.3:1 against the panel), so on and off read at a glance, including the memory switches in Brain and the rigorous-mode switch in the editor.
One smaller change: when you click Continue to Notion or Continue to Google, the button now stays focused while it opens the provider instead of greying out, so a keyboard user doesn't lose their place.