The QUESTION face shows only the stem and options. Tap (or press Space) to reveal the ANSWER face with the correct option and a handout-based "why".
Same card, plus four self-rating buttons. Picking a rating fills the button with its color so you can confirm your choice before the card advances.
Multiple-choice. Options lock after picking; correct is always highlighted green, wrong red, with a short "why". Use ◀ Prev / Skip ▶ / Next ▶. Default order is Paper Order; tap the order button to switch to Shuffle. ↺ Start Over resets without refreshing and preserves order mode.
Two tabs: AT-RISK (past items likely to be revised) and PREDICTED NEW (new items built from earlier-term patterns). Each card lists the original item, a why-note, possible revision variants or overlap notes. Summary panel at the bottom.
Both the floating dot and the color bar are draggable. The current segment glows. Colors: green correct/easy, red wrong/repeat, amber hard, lime okay, gray untouched.
Filter by PAST, AT-RISK, PREDICTED NEW, EXAM TRAPS, or topic. Chips hide in Exam and Delta modes.
Button label describes the current mode. Tapping re-orders without resetting.
Theme, mode, deck, card index, shuffle state, ratings, exam state, and delta tab persist in localStorage.
Flip uses a fast opacity crossfade on phones. Scrubber uses pointer events with full-hit-area dragging.