A realistic screen recording of a digital educational interface with a white background. The screen displays Chinese text notes and math problems about quadratic functions. Specifically, section 4 talks about "Maximum value trap" and section 5 about "Intersections and roots". Below that is a multiple-choice question.
Action: A mouse cursor moves smoothly to the bottom right corner and clicks the rectangular button labeled "添加到错题库" (Add to Incorrect Questions Bank). Upon clicking, the button shows a subtle depressed press effect.
Reaction: Immediately after the click, in the blank white space on the left side of the screen, a colorful icon of a notebook pops up with a small "check mark" animation. Next to the icon, a text tip appears saying "已加入错题库" (Added to bank), confirming the action. The camera remains static, focusing on the UI interaction.