Error Part 3

Basics: stage 470×222px, background #13131C, all coordinates in px from the stage's top-left, everything clipped to the stage (top corners rounded 40px). The animation is a 2s loop that plays by itself and is seamless; the video is 12s = six loops. T = seconds since the video start; u = (T + 0.25) mod 2 (the first frame is already 0.25s after a tap). A tap on Continue every second, at u = 0 and u = 1 (video T = 0.75, 1.75, 2.75 …). Phase A (0 ≤ u < 1, dt = u): the tap at u = 0 is rejected → the error state; this is the only part that differs between the six types. Phase B (1 ≤ u < 2, dt = u − 1): the tap at u = 1 fixes the value → valid state, then the field resets; phase B is identical for all six. Fonts: "Segoe UI Variable Display","Segoe UI",sans-serif. Colors: RED #FF4D6A, MINT #3DDBB0, violet #6E5BFF, cyan #38C6FF.

The bottom edge of the field snaps into a red zigzag that spreads from the middle, buzzes sideways and flattens back into a straight red line. 
- Phase A only: amplitude A = 9·clamp(dt/0.05)·(1 − ease(seg(dt, 0.25, 0.8))); half-width span = 10 + 205·ease(seg(dt, 0, 0.22)).
- The field path (fill and border) is built with its bottom edge replaced, between x 428 and x 42 (inside the corner arcs), by points every 2px at y = 104 + zig(x), where zig(x) = A·e·tri((x − 235)/22 − 5dt), tri(v) = 1 − 4·|frac(v) − 0.5| (−1…1), and e = clamp((span − |x − 235|)/30)·clamp((x − 42)/16)·clamp((428 − x)/16) (tapers at both ends so it joins the corners).
- Border width bw = 2.5 + 1.5·bump(dt, 0, 0.5). Everything else uses the Basics defaults.