08残り時間値が0に触れると揺れる期限切れQRコード

<main class="stage">
<div class="esr is-demo" id="esrRoot">
  <div class="esr__badge" id="esrBadge">コード有効</div>
  <button class="esr__ctrl" id="esrCtrl" type="button">一時停止</button>
  <div class="esr__panel" id="esrPanel">
    <div class="esr__code" id="esrCode">QR</div>
    <div class="esr__msg" id="esrMsg">スキャンしてください</div>
    <button class="esr__retry" id="esrRetry" type="button">再取得</button>
  </div>
</div>
</main>

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

// 핵심: 만료 시점부터 진동수·지수 감쇠를 곱한 감쇠 사인파로 패널을 좌우로 흔든다 —
// 일정 진폭에서 시작해 자연스럽게 잦아드는 진짜 물리 흔들림이다.

@include stage($stage-ink);

.esr {
  position: relative;
  width: min(100%, 280px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.esr__badge {
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: rgba(255, 247, 230, .08);
  color: $subject-cream;
  font-weight: 700;
  font-size: 11px;
}

.esr__ctrl {
  position: absolute;
  top: 0;
  right: 0;
  border: 0;
  border-radius: $r-xs;
  padding: $sp-1 $sp-2;
  background: rgba(255, 247, 230, .12);
  color: $subject-cream;
  font-weight: 600;
  font-size: 10px;
  line-height: 1.4;
  cursor: pointer;
}
.esr__ctrl:focus-visible { outline: 2px solid $subject-blue-light; outline-offset: 2px; }

.esr__panel {
  width: 100%;
  max-width: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-2;
  padding: $sp-5;
  border-radius: $r-card;
  background: rgba(255, 255, 255, .05);
  box-shadow: $shadow-raised;
  will-change: transform;
  transition: background-color $dur-quick $ease-out;

  &--expired {
    background: rgba(255, 100, 100, .08);
  }
}

.esr__code {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: $r-sm;
  background: rgba(20, 26, 38, .9);
  color: $subject-cream;
  font-weight: 800;
  font-size: 20px;
  transition: color $dur-quick $ease-out;

  .esr__panel--expired & {
    color: $error;
  }
}

.esr__msg {
  color: $subject-cream;
  font-weight: 600;
  font-size: 12px;
  text-align: center;
}

.esr__retry {
  border: 0;
  border-radius: $r-pill;
  padding: $sp-1 $sp-4;
  background: $subject-blue-deep;
  color: $subject-cream;
  font-weight: 700;
  font-size: 11px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity $dur-quick $ease-out;

  .esr__panel--expired & {
    opacity: 1;
    pointer-events: auto;
  }
}
.esr__retry:focus-visible { outline: 2px solid $subject-blue-light; outline-offset: 2px; }

@media (max-width: 340px) {
  .esr { gap: $sp-1; }
  .esr__panel { padding: $sp-2 $sp-3; max-width: 170px; gap: 4px; }
  .esr__code { width: 40px; height: 40px; font-size: 13px; }
  .esr__msg { font-size: 10px; }
  .esr__retry { padding: $sp-1 $sp-3; font-size: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  .esr__panel { transform: none !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.esr {
  position: relative;
  width: min(100%, 280px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.esr__badge {
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 247, 230, 0.08);
  color: #fff7e6;
  font-weight: 700;
  font-size: 11px;
}

.esr__ctrl {
  position: absolute;
  top: 0;
  right: 0;
  border: 0;
  border-radius: 4px;
  padding: 4px 8px;
  background: rgba(255, 247, 230, 0.12);
  color: #fff7e6;
  font-weight: 600;
  font-size: 10px;
  line-height: 1.4;
  cursor: pointer;
}

.esr__ctrl:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 2px;
}

.esr__panel {
  width: 100%;
  max-width: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  will-change: transform;
  transition: background-color 220ms ease-out;
}
.esr__panel--expired {
  background: rgba(255, 100, 100, 0.08);
}

.esr__code {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: rgba(20, 26, 38, 0.9);
  color: #fff7e6;
  font-weight: 800;
  font-size: 20px;
  transition: color 220ms ease-out;
}
.esr__panel--expired .esr__code {
  color: #c2361a;
}

.esr__msg {
  color: #fff7e6;
  font-weight: 600;
  font-size: 12px;
  text-align: center;
}

.esr__retry {
  border: 0;
  border-radius: 999px;
  padding: 4px 16px;
  background: #0a4fe8;
  color: #fff7e6;
  font-weight: 700;
  font-size: 11px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease-out;
}
.esr__panel--expired .esr__retry {
  opacity: 1;
  pointer-events: auto;
}

.esr__retry:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 2px;
}

@media (max-width: 340px) {
  .esr {
    gap: 4px;
  }
  .esr__panel {
    padding: 8px 12px;
    max-width: 170px;
    gap: 4px;
  }
  .esr__code {
    width: 40px;
    height: 40px;
    font-size: 13px;
  }
  .esr__msg {
    font-size: 10px;
  }
  .esr__retry {
    padding: 4px 12px;
    font-size: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .esr__panel {
    transform: none !important;
  }
}

(function () {
  // EXPIRED_SHAKE_AMPLITUDE_PX — 변형 1: 10 → 16 으로 늘리면 만료 시 흔들림 폭이 커진다.
  var EXPIRED_SHAKE_AMPLITUDE_PX = 10;
  var LOOP_MS = 2000;
  var EXPIRE_AT = 250;
  var SHAKE_MS = 700;
  var SHAKE_FREQ = 5;
  // 시연 스케줄: 2초 루프 안에 만료→흔들림→자동 재시도→만료→흔들림 을 두 번 넣는다.
  // RETRY_AT(자동 재시도)·EXPIRE_AT2(두 번째 만료)만 새로 추가 — 진폭·진동수·감쇠 함수는 그대로.
  var RETRY_AT = 1050;
  var EXPIRE_AT2 = 1300;

  var root = document.getElementById('esrRoot');
  var badge = document.getElementById('esrBadge');
  var ctrl = document.getElementById('esrCtrl');
  var panel = document.getElementById('esrPanel');
  var codeEl = document.getElementById('esrCode');
  var msgEl = document.getElementById('esrMsg');
  var retryBtn = document.getElementById('esrRetry');

  // 계산 한 겹: 진동수(SHAKE_FREQ)와 지수 감쇠를 곱한 감쇠 사인파로 흔들림을 만든다.
  function shakeOffset(t) {
    if (t < 0 || t > SHAKE_MS) return 0;
    var p = t / SHAKE_MS;
    return Math.sin(p * Math.PI * 2 * SHAKE_FREQ) * EXPIRED_SHAKE_AMPLITUDE_PX * Math.exp(-3.2 * p);
  }

  // 자동 재생에서 만료 구간 판정: 첫 만료(EXPIRE_AT~RETRY_AT) · 두 번째 만료(EXPIRE_AT2~루프 끝) 두 번
  function autoExpired(elapsed) {
    return (elapsed >= EXPIRE_AT && elapsed < RETRY_AT) || elapsed >= EXPIRE_AT2;
  }
  function autoExpireStart(elapsed) {
    return elapsed < RETRY_AT ? EXPIRE_AT : EXPIRE_AT2;
  }

  var manualRetryAt = -1;

  function render(elapsed) {
    var expired = manualRetryAt < 0 && autoExpired(elapsed);
    var t = manualRetryAt >= 0 ? elapsed - manualRetryAt : elapsed - autoExpireStart(elapsed);
    var offset = expired ? shakeOffset(t) : 0;
    panel.style.transform = offset ? 'translateX(' + offset.toFixed(2) + 'px)' : 'none';

    // 계산 한 겹: 같은 감쇠 사인파(shakeOffset)의 크기를 그림자·배경 톤·QR 격자 흐림에 그대로 전파한다.
    var normOffset = Math.min(1, Math.abs(offset) / EXPIRED_SHAKE_AMPLITUDE_PX);
    panel.style.boxShadow = '0 14px 24px rgba(23, 20, 26, .32), 0 0 ' +
      (normOffset * 20).toFixed(1) + 'px rgba(233, 64, 64, ' + (normOffset * 0.55).toFixed(2) + ')';
    codeEl.style.filter = normOffset > 0.02 ? 'blur(' + (normOffset * 1.2).toFixed(2) + 'px)' : 'none';

    if (expired) {
      panel.classList.add('esr__panel--expired');
      panel.style.backgroundColor = 'rgba(255, 100, 100, ' + (0.08 + normOffset * 0.10).toFixed(3) + ')';
      codeEl.textContent = '×';
      msgEl.textContent = 'コードの有効期限が切れました';
      badge.textContent = 'コード期限切れ';
    } else {
      panel.classList.remove('esr__panel--expired');
      panel.style.backgroundColor = '';
      codeEl.textContent = 'QR';
      msgEl.textContent = 'スキャンしてください';
      badge.textContent = 'コード有効';
    }
  }

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var playing = true;
  var elapsed = reduce ? EXPIRE_AT + SHAKE_MS : 0;
  if (reduce) {
    playing = false;
    root.classList.remove('is-demo');
  }

  var lastTs = null;
  function tick(ts) {
    if (lastTs === null) lastTs = ts;
    var dt = ts - lastTs;
    lastTs = ts;
    if (playing) {
      elapsed += dt;
      if (elapsed >= LOOP_MS) { elapsed -= LOOP_MS; manualRetryAt = -1; }
    }
    render(elapsed);
    requestAnimationFrame(tick);
  }
  render(elapsed);
  requestAnimationFrame(tick);

  retryBtn.addEventListener('click', function () {
    manualRetryAt = elapsed;
  });

  ctrl.addEventListener('click', function () {
    playing = !playing;
    ctrl.textContent = playing ? '一時停止' : '再生';
  });
  ctrl.addEventListener('keydown', function (e) {
    if ((e.key === 'r' || e.key === 'R') && !reduce) {
      elapsed = 0;
      manualRetryAt = -1;
      playing = true;
      ctrl.textContent = '一時停止';
    }
  });
})();

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

export default function ExpiredShakeRetry() {
  const rootRef = useRef<HTMLDivElement>(null);
  const panelRef = useRef<HTMLDivElement>(null);
  const ctrlRef = useRef<HTMLButtonElement>(null);
  const retryRef = useRef<HTMLButtonElement>(null);
  const [badge, setBadge] = useState("코드 유효");
  const [ctrlLabel, setCtrlLabel] = useState("일시정지");
  const [code, setCode] = useState("QR");
  const [msg, setMsg] = useState("스캔해 주세요");
  const [expired, setExpired] = useState(false);

  useEffect(() => {
    const root = rootRef.current;
    const panel = panelRef.current;
    const ctrl = ctrlRef.current;
    const retryBtn = retryRef.current;
    if (!root || !panel || !ctrl || !retryBtn) return;

    // EXPIRED_SHAKE_AMPLITUDE_PX — 변형 1: 10 → 16 으로 늘리면 만료 시 흔들림 폭이 커진다.
    const EXPIRED_SHAKE_AMPLITUDE_PX = 10;
    const LOOP_MS = 2000;
    const EXPIRE_AT = 250;
    const SHAKE_MS = 700;
    const SHAKE_FREQ = 5;
    // 시연 스케줄: 2초 루프 안에 만료→흔들림→자동 재시도→만료→흔들림 을 두 번 넣는다.
    // RETRY_AT(자동 재시도)·EXPIRE_AT2(두 번째 만료)만 새로 추가 — 진폭·진동수·감쇠 함수는 그대로.
    const RETRY_AT = 1050;
    const EXPIRE_AT2 = 1300;

    // 계산 한 겹: 진동수(SHAKE_FREQ)와 지수 감쇠를 곱한 감쇠 사인파로 흔들림을 만든다.
    function shakeOffset(t: number) {
      if (t < 0 || t > SHAKE_MS) return 0;
      const p = t / SHAKE_MS;
      return Math.sin(p * Math.PI * 2 * SHAKE_FREQ) * EXPIRED_SHAKE_AMPLITUDE_PX * Math.exp(-3.2 * p);
    }

    // 자동 재생에서 만료 구간 판정: 첫 만료(EXPIRE_AT~RETRY_AT) · 두 번째 만료(EXPIRE_AT2~루프 끝) 두 번
    function autoExpired(elapsed: number) {
      return (elapsed >= EXPIRE_AT && elapsed < RETRY_AT) || elapsed >= EXPIRE_AT2;
    }
    function autoExpireStart(elapsed: number) {
      return elapsed < RETRY_AT ? EXPIRE_AT : EXPIRE_AT2;
    }

    let manualRetryAt = -1;

    function render(elapsed: number) {
      const isExpired = manualRetryAt < 0 && autoExpired(elapsed);
      const t = manualRetryAt >= 0 ? elapsed - manualRetryAt : elapsed - autoExpireStart(elapsed);
      const offset = isExpired ? shakeOffset(t) : 0;
      panel!.style.transform = offset ? "translateX(" + offset.toFixed(2) + "px)" : "none";

      // 계산 한 겹: 같은 감쇠 사인파(shakeOffset)의 크기를 그림자·배경 톤·QR 격자 흐림에 그대로 전파한다.
      const normOffset = Math.min(1, Math.abs(offset) / EXPIRED_SHAKE_AMPLITUDE_PX);
      panel!.style.boxShadow = "0 14px 24px rgba(23, 20, 26, .32), 0 0 " +
        (normOffset * 20).toFixed(1) + "px rgba(233, 64, 64, " + (normOffset * 0.55).toFixed(2) + ")";

      if (isExpired) {
        setExpired(true);
        setCode("×");
        setMsg("코드가 만료됐어요");
        setBadge("코드 만료");
      } else {
        setExpired(false);
        setCode("QR");
        setMsg("스캔해 주세요");
        setBadge("코드 유효");
      }
    }

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    let playing = true;
    let elapsed = reduce ? EXPIRE_AT + SHAKE_MS : 0;
    if (reduce) {
      playing = false;
      root.classList.remove("is-demo");
    }

    let lastTs: number | null = null;
    let raf = 0;
    function tick(ts: number) {
      if (lastTs === null) lastTs = ts;
      const dt = ts - lastTs;
      lastTs = ts;
      if (playing) {
        elapsed += dt;
        if (elapsed >= LOOP_MS) { elapsed -= LOOP_MS; manualRetryAt = -1; }
      }
      render(elapsed);
      raf = requestAnimationFrame(tick);
    }
    render(elapsed);
    raf = requestAnimationFrame(tick);

    function onRetry() {
      manualRetryAt = elapsed;
    }
    function onClick() {
      playing = !playing;
      setCtrlLabel(playing ? "일시정지" : "재생");
    }
    function onKeydown(e: KeyboardEvent) {
      if ((e.key === "r" || e.key === "R") && !reduce) {
        elapsed = 0;
        manualRetryAt = -1;
        playing = true;
        setCtrlLabel("일시정지");
      }
    }
    retryBtn.addEventListener("click", onRetry);
    ctrl.addEventListener("click", onClick);
    ctrl.addEventListener("keydown", onKeydown);

    return () => {
      cancelAnimationFrame(raf);
      retryBtn.removeEventListener("click", onRetry);
      ctrl.removeEventListener("click", onClick);
      ctrl.removeEventListener("keydown", onKeydown);
    };
  }, []);

  return (
    <main className={styles.stage}>
      <div className={`${styles.esr} is-demo`} ref={rootRef}>
        <div className={styles.esr__badge}>{badge}</div>
        <button className={styles.esr__ctrl} type="button" ref={ctrlRef}>{ctrlLabel}</button>
        <div
          className={`${styles.esr__panel}${expired ? " " + styles["esr__panel--expired"] : ""}`}
          ref={panelRef}
        >
          <div className={styles.esr__code}>{code}</div>
          <div className={styles.esr__msg}>{msg}</div>
          <button className={styles.esr__retry} type="button" ref={retryRef}>다시 받기</button>
        </div>
      </div>
    </main>
  );
}