08Reset on success — a single successful login sends the failure-count value straight back to zero

<main class="stage">
<div class="asr is-demo" id="asr">
  <div class="asr__readout">
    <span class="asr__label">Failure count</span>
    <span class="asr__count" id="asrCount">0</span>
  </div>
  <div class="asr__row">
    <button class="asr__btn asr__btn--fail" id="asrFailBtn" type="button">Login fail</button>
    <button class="asr__btn asr__btn--ok" id="asrOkBtn" type="button">Login success</button>
  </div>
</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

// 계산 겹: 성공 시 카운터 스케일을 스프링-감쇠 물리로 적분해 오버슈트 복귀 — index.html 참조
@include stage($stage-yellow);

.asr {
  display: grid;
  gap: $sp-5;
  justify-items: center;
}

.asr__readout {
  display: grid;
  justify-items: center;
  gap: $sp-1;
}

.asr__label {
  font: 500 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba($stage-ink, .64);
}

.asr__count {
  font: 800 44px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $error;
  font-variant-numeric: tabular-nums;
  transform-origin: center;
}

.asr__count--ok { color: $subject-blue-deep; }

.asr__row {
  display: flex;
  gap: $sp-3;
}

.asr__btn {
  border: 0;
  border-radius: $r-control;
  padding: $sp-2 $sp-3;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform $dur-instant $ease-out;

  &:active { transform: scale(.96); }
}

.asr__btn--fail { background: $stage-ink; color: $subject-cream; }
.asr__btn--ok { background: $subject-blue-deep; color: $subject-cream; }

@media (max-width: 340px) {
  .asr__count { font-size: 34px; }
  .asr__row { gap: $sp-2; }
}

@media (prefers-reduced-motion: reduce) {
  .asr__btn { transition: none; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.asr {
  display: grid;
  gap: 20px;
  justify-items: center;
}

.asr__readout {
  display: grid;
  justify-items: center;
  gap: 4px;
}

.asr__label {
  font: 500 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba(23, 20, 26, 0.64);
}

.asr__count {
  font: 800 44px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #c2361a;
  font-variant-numeric: tabular-nums;
  transform-origin: center;
}

.asr__count--ok {
  color: #0a4fe8;
}

.asr__row {
  display: flex;
  gap: 12px;
}

.asr__btn {
  border: 0;
  border-radius: 12px;
  padding: 8px 12px;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform 140ms ease-out;
}
.asr__btn:active {
  transform: scale(0.96);
}

.asr__btn--fail {
  background: #17141a;
  color: #fff7e6;
}

.asr__btn--ok {
  background: #0a4fe8;
  color: #fff7e6;
}

@media (max-width: 340px) {
  .asr__count {
    font-size: 34px;
  }
  .asr__row {
    gap: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .asr__btn {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('asr');
  var failBtn = document.getElementById('asrFailBtn');
  var okBtn = document.getElementById('asrOkBtn');
  var countEl = document.getElementById('asrCount');

  // 상수: 최대 표시 Failure count · 리셋 스프링 물리(강성·감쇠·질량)
  var MAX_SHOWN = 6;
  var SPRING_K = 220;
  var SPRING_C = 14;
  var SPRING_M = 1;

  var fails = 0;
  var scalePos = 1;
  var scaleVel = 0;
  var scaleTarget = 1;
  var rafId = null;

  function paintCount() {
    countEl.textContent = String(fails);
    countEl.classList.toggle('asr__count--ok', fails === 0);
  }

  // 계산 겹: 리셋 순간 스케일 값을 스프링-감쇠 물리로 적분해 오버슈트 복귀를 만든다
  function scaleTick(ts, last) {
    var dt = Math.min(32, ts - last) / 1000;
    var disp = scalePos - scaleTarget;
    var acc = (-SPRING_K * disp - SPRING_C * scaleVel) / SPRING_M;
    scaleVel += acc * dt;
    scalePos += scaleVel * dt;
    countEl.style.transform = 'scale(' + scalePos.toFixed(3) + ')';
    if (Math.abs(disp) > 0.004 || Math.abs(scaleVel) > 0.01) {
      rafId = requestAnimationFrame(function (t) { scaleTick(t, ts); });
    } else {
      scalePos = scaleTarget;
      countEl.style.transform = 'scale(1)';
    }
  }

  function bounce() {
    if (rafId) cancelAnimationFrame(rafId);
    scalePos = 1.5;
    scaleVel = 0;
    scaleTarget = 1;
    rafId = requestAnimationFrame(function (ts) { scaleTick(ts, ts - 16); });
  }

  function fail() {
    fails = Math.min(MAX_SHOWN, fails + 1);
    paintCount();
  }

  function success() {
    fails = 0;
    paintCount();
    bounce();
  }

  failBtn.addEventListener('click', function () { root.classList.remove('is-demo'); stopAutoplay(); fail(); });
  okBtn.addEventListener('click', function () { root.classList.remove('is-demo'); stopAutoplay(); success(); });
  paintCount();

  var autoTimer = null;
  var tick = 0;
  function autoTick() {
    tick += 1;
    if (tick % 4 === 0) success(); else fail();
  }
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (!reduce) { autoTimer = setInterval(autoTick, 380); }
})();

import { useEffect, useRef } from "react";
import styles from "./AuthAttemptSuccessReset.module.scss";

type Box<T> = { current: T };

export default function AuthAttemptSuccessReset() {
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement | null>;

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const failBtn = root.querySelector(`.${styles["btn--fail"]}`) as HTMLButtonElement | null;
    const okBtn = root.querySelector(`.${styles["btn--ok"]}`) as HTMLButtonElement | null;
    const countEl = root.querySelector(`.${styles.count}`) as HTMLElement | null;
    if (!failBtn || !okBtn || !countEl) return;

    // 상수: 최대 표시 실패 횟수 · 리셋 스프링 물리(강성·감쇠·질량)
    const MAX_SHOWN = 6;
    const SPRING_K = 220;
    const SPRING_C = 14;
    const SPRING_M = 1;

    let fails = 0;
    let scalePos = 1;
    let scaleVel = 0;
    let scaleTarget = 1;
    let rafId: number | null = null;

    function paintCount() {
      countEl!.textContent = String(fails);
      countEl!.classList.toggle(styles["count--ok"], fails === 0);
    }

    // 계산 겹: 리셋 순간 스케일 값을 스프링-감쇠 물리로 적분해 오버슈트 복귀를 만든다
    function scaleTick(ts: number, last: number) {
      const dt = Math.min(32, ts - last) / 1000;
      const disp = scalePos - scaleTarget;
      const acc = (-SPRING_K * disp - SPRING_C * scaleVel) / SPRING_M;
      scaleVel += acc * dt;
      scalePos += scaleVel * dt;
      countEl!.style.transform = "scale(" + scalePos.toFixed(3) + ")";
      if (Math.abs(disp) > 0.004 || Math.abs(scaleVel) > 0.01) {
        rafId = requestAnimationFrame((t) => scaleTick(t, ts));
      } else {
        scalePos = scaleTarget;
        countEl!.style.transform = "scale(1)";
      }
    }

    function bounce() {
      if (rafId !== null) cancelAnimationFrame(rafId);
      scalePos = 1.5;
      scaleVel = 0;
      scaleTarget = 1;
      rafId = requestAnimationFrame((ts) => scaleTick(ts, ts - 16));
    }

    function fail() { fails = Math.min(MAX_SHOWN, fails + 1); paintCount(); }
    function success() { fails = 0; paintCount(); bounce(); }

    function onFailClick() { root!.classList.remove(styles["is-demo"]); stopAutoplay(); fail(); }
    function onOkClick() { root!.classList.remove(styles["is-demo"]); stopAutoplay(); success(); }
    failBtn.addEventListener("click", onFailClick);
    okBtn.addEventListener("click", onOkClick);
    paintCount();

    let autoTimer: number | null = null;
    let tick = 0;
    function autoTick() {
      tick += 1;
      if (tick % 4 === 0) success(); else fail();
    }
    function stopAutoplay() { if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; } }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(autoTick, 380); }

    return () => {
      stopAutoplay();
      if (rafId !== null) cancelAnimationFrame(rafId);
      failBtn.removeEventListener("click", onFailClick);
      okBtn.removeEventListener("click", onOkClick);
    };
  }, []);

  return (
    <div ref={rootRef} className={`${styles.stage} ${styles.asr} ${styles["is-demo"]}`}>
      <div className={styles.readout}>
        <span className={styles.label}>실패 횟수</span>
        <span className={styles.count}>0</span>
      </div>
      <div className={styles.row}>
        <button className={`${styles.btn} ${styles["btn--fail"]}`} type="button">로그인 실패</button>
        <button className={`${styles.btn} ${styles["btn--ok"]}`} type="button">로그인 성공</button>
      </div>
    </div>
  );
}