07決済金額の桁が回転して変わるQRコードパネル

<main class="stage">
<div class="ars is-demo" id="arsRoot">
  <div class="ars__badge" id="arsBadge">決済金額</div>
  <button class="ars__ctrl" id="arsCtrl" type="button">一時停止</button>
  <div class="ars__panel">
    <div class="ars__sweep" id="arsSweep" aria-hidden="true"></div>
    <div class="ars__digits" id="arsDigits"></div>
    <span class="ars__unit">ウォン</span>
  </div>
</div>
</main>

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

// 핵심: 자릿수 인덱스(왼쪽부터)에 스태거 값을 곱해 컬럼별 시작 지연을 구하고,
// back-out 이징으로 되돌아오는 오버슛과 함께 각 자릿수가 순서대로 굴러 올라간다.

@include stage($stage-ink);

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

.ars__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;
}

.ars__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;
}
.ars__ctrl:focus-visible { outline: 2px solid $subject-blue-light; outline-offset: 2px; }

.ars__panel {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: $sp-2;
  padding: $sp-5 $sp-6;
  border-radius: $r-card;
  background: rgba(255, 255, 255, .05);
  box-shadow: $shadow-raised;
  overflow: hidden;
}

// 계산된 하이라이트 sweep — 폭 240%(-120%~120%)로 대각선 가로지름, 불투명도·위치는 JS 가 롤 진행률로 제어
.ars__sweep {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(100deg, transparent 30%, rgba($subject-blue-light, .35) 50%, transparent 70%);
  will-change: transform, opacity;
}

.ars__digits {
  position: relative;
  display: flex;
}

.ars__col {
  position: relative;
  width: 22px;
  height: 40px;
  overflow: hidden;

  &--comma {
    width: 10px;
  }
}

.ars__track {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  height: 200%;
  transform: translateY(0%);
  will-change: transform;
}

.ars__d {
  height: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 26px;
  font-variant-numeric: tabular-nums;
  color: $subject-cream;
}

.ars__unit {
  color: $subject-cream;
  font-weight: 700;
  font-size: 16px;
  opacity: .8;
}

@media (max-width: 340px) {
  .ars__panel { padding: $sp-4 $sp-5; }
  .ars__col { width: 18px; height: 32px; }
  .ars__col--comma { width: 8px; }
  .ars__d { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .ars__track { transition: 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);
}

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

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

.ars__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;
}

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

.ars__panel {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 20px 24px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  overflow: hidden;
}

.ars__sweep {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(100deg, transparent 30%, rgba(91, 140, 248, 0.35) 50%, transparent 70%);
  will-change: transform, opacity;
}

.ars__digits {
  position: relative;
  display: flex;
}

.ars__col {
  position: relative;
  width: 22px;
  height: 40px;
  overflow: hidden;
}
.ars__col--comma {
  width: 10px;
}

.ars__track {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  height: 200%;
  transform: translateY(0%);
  will-change: transform;
}

.ars__d {
  height: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 26px;
  font-variant-numeric: tabular-nums;
  color: #fff7e6;
}

.ars__unit {
  color: #fff7e6;
  font-weight: 700;
  font-size: 16px;
  opacity: 0.8;
}

@media (max-width: 340px) {
  .ars__panel {
    padding: 16px 20px;
  }
  .ars__col {
    width: 18px;
    height: 32px;
  }
  .ars__col--comma {
    width: 8px;
  }
  .ars__d {
    font-size: 20px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ars__track {
    transition: none !important;
  }
}

(function () {
  // AMOUNT_ROLL_DIGIT_STAGGER_MS — 변형 1: 60 → 110 으로 늘리면 자릿수가 더 크게 어긋나며 굴러간다.
  var AMOUNT_ROLL_DIGIT_STAGGER_MS = 60;
  var LOOP_MS = 2000;
  var ROLL_MS = 480;
  var FROM = '08,000';
  var TO = '12,400';
  // 시연 스케줄: 2초 루프 안에 굴러가는 방향을 두 번 넣는다(증가 → 감소) — 로직·상수는 그대로,
  // 두 번째 구간은 같은 트랙(FROM/TO 두 자릿수)을 반대로 재생해 되돌아가는 롤을 보여준다.
  var SEG_DURATION = (TO.length - 1) * AMOUNT_ROLL_DIGIT_STAGGER_MS + ROLL_MS;
  var SEG2_START = 1050;

  var root = document.getElementById('arsRoot');
  var badge = document.getElementById('arsBadge');
  var ctrl = document.getElementById('arsCtrl');
  var digitsEl = document.getElementById('arsDigits');
  var sweepEl = document.getElementById('arsSweep');

  var cols = [];
  for (var i = 0; i < TO.length; i += 1) {
    var col = document.createElement('span');
    col.className = 'ars__col';
    if (TO[i] === ',') col.classList.add('ars__col--comma');
    var track = document.createElement('span');
    track.className = 'ars__track';
    var a = document.createElement('span'); a.className = 'ars__d'; a.textContent = FROM[i];
    var b = document.createElement('span'); b.className = 'ars__d'; b.textContent = TO[i];
    track.appendChild(a); track.appendChild(b);
    col.appendChild(track);
    digitsEl.appendChild(col);
    // 계산 한 겹: 자릿수 인덱스(왼쪽부터)에 스태거를 곱해 각 컬럼의 시작 지연을 구한다.
    cols.push({ track: track, delay: i * AMOUNT_ROLL_DIGIT_STAGGER_MS, isDigit: TO[i] !== ',' });
  }
  var maxDelay = (TO.length - 1) * AMOUNT_ROLL_DIGIT_STAGGER_MS;
  var ROLL_END = maxDelay + ROLL_MS;

  function easeOutBack(t) {
    var c1 = 1.4, c3 = c1 + 1;
    return 1 + c3 * Math.pow(t - 1, 3) + c1 * Math.pow(t - 1, 2);
  }

  function progressFor(elapsed, segStart, delay) {
    var local = elapsed - segStart - delay;
    if (local <= 0) return 0;
    if (local >= ROLL_MS) return 1;
    return local / ROLL_MS;
  }

  function render(elapsed) {
    var anyMoving = false;

    // 계산 한 겹: 두 번째 구간(감소 방향)이 시작됐는지는 컬럼별 지연 없이 구간 전체로 판정한다 —
    // 첫 구간 꼬리와 겹치지 않도록 SEG2_START 를 첫 구간 최대 종료(ROLL_END)보다 뒤에 둔다.
    var seg2Active = elapsed >= SEG2_START;

    cols.forEach(function (c) {
      var translateY, p;
      if (seg2Active) {
        var p2 = progressFor(elapsed, SEG2_START, c.delay);
        var eased2 = easeOutBack(p2);
        translateY = -(1 - eased2) * 50;
        p = p2;
      } else {
        var p1 = progressFor(elapsed, 0, c.delay);
        var eased1 = easeOutBack(p1);
        translateY = -eased1 * 50;
        p = p1;
      }
      if (p > 0 && p < 1) anyMoving = true;
      c.track.style.transform = 'translateY(' + translateY.toFixed(2) + '%)';

      // 계산 한 겹: 롤 속도(사인 피크, 구간 중앙에서 최대)에 비례한 잔상 톤 — 형태는 바꾸지 않는다.
      var velocity = Math.sin(Math.min(1, Math.max(0, p)) * Math.PI);
      c.track.style.filter = velocity > 0.01 ? 'blur(' + (velocity * 1.1).toFixed(2) + 'px)' : 'none';
      c.track.style.boxShadow = velocity > 0.01
        ? '0 0 ' + (velocity * 9).toFixed(1) + 'px rgba(91, 140, 248, ' + (velocity * 0.5).toFixed(2) + ')'
        : 'none';
    });

    badge.textContent = anyMoving ? '更新中' : '決済金額';

    // 계산 한 겹: 카드 하이라이트 sweep — 롤 진행률(globalP)의 함수로 패널 전체를 가로지른다.
    var globalP = -1;
    if (elapsed >= 0 && elapsed < SEG_DURATION) {
      globalP = elapsed / SEG_DURATION;
    } else if (elapsed >= SEG2_START && elapsed < SEG2_START + SEG_DURATION) {
      globalP = (elapsed - SEG2_START) / SEG_DURATION;
    }
    if (globalP >= 0) {
      var sweepOpacity = Math.sin(globalP * Math.PI);
      sweepEl.style.opacity = (sweepOpacity * 0.8).toFixed(2);
      sweepEl.style.transform = 'translateX(' + (-120 + globalP * 240).toFixed(1) + '%)';
    } else {
      sweepEl.style.opacity = '0';
    }
  }

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var playing = true;
  var elapsed = reduce ? ROLL_END : 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;
    }
    render(elapsed);
    requestAnimationFrame(tick);
  }
  render(elapsed);
  requestAnimationFrame(tick);

  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;
      playing = true;
      ctrl.textContent = '一時停止';
    }
  });
})();

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

export default function AmountRollSwap() {
  const rootRef = useRef<HTMLDivElement>(null);
  const digitsRef = useRef<HTMLDivElement>(null);
  const ctrlRef = useRef<HTMLButtonElement>(null);
  const sweepRef = useRef<HTMLDivElement>(null);
  const [badge, setBadge] = useState("결제 금액");
  const [ctrlLabel, setCtrlLabel] = useState("일시정지");

  useEffect(() => {
    const root = rootRef.current;
    const digitsEl = digitsRef.current;
    const ctrl = ctrlRef.current;
    const sweepEl = sweepRef.current;
    if (!root || !digitsEl || !ctrl || !sweepEl) return;

    // AMOUNT_ROLL_DIGIT_STAGGER_MS — 변형 1: 60 → 110 으로 늘리면 자릿수가 더 크게 어긋나며 굴러간다.
    const AMOUNT_ROLL_DIGIT_STAGGER_MS = 60;
    const LOOP_MS = 2000;
    const ROLL_MS = 480;
    const FROM = "08,000";
    const TO = "12,400";
    // 시연 스케줄: 2초 루프 안에 굴러가는 방향을 두 번 넣는다(증가 → 감소) — 로직·상수는 그대로,
    // 두 번째 구간은 같은 트랙(FROM/TO 두 자릿수)을 반대로 재생해 되돌아가는 롤을 보여준다.
    const SEG_DURATION = (TO.length - 1) * AMOUNT_ROLL_DIGIT_STAGGER_MS + ROLL_MS;
    const SEG2_START = 1050;

    digitsEl.innerHTML = "";
    const cols: { track: HTMLSpanElement; delay: number }[] = [];
    for (let i = 0; i < TO.length; i += 1) {
      const col = document.createElement("span");
      col.className = styles.ars__col;
      if (TO[i] === ",") col.classList.add(styles["ars__col--comma"]);
      const track = document.createElement("span");
      track.className = styles.ars__track;
      const a = document.createElement("span"); a.className = styles.ars__d; a.textContent = FROM[i];
      const b = document.createElement("span"); b.className = styles.ars__d; b.textContent = TO[i];
      track.appendChild(a); track.appendChild(b);
      col.appendChild(track);
      digitsEl.appendChild(col);
      // 계산 한 겹: 자릿수 인덱스(왼쪽부터)에 스태거를 곱해 각 컬럼의 시작 지연을 구한다.
      cols.push({ track, delay: i * AMOUNT_ROLL_DIGIT_STAGGER_MS });
    }
    function easeOutBack(t: number) {
      const c1 = 1.4, c3 = c1 + 1;
      return 1 + c3 * Math.pow(t - 1, 3) + c1 * Math.pow(t - 1, 2);
    }

    function progressFor(elapsed: number, segStart: number, delay: number) {
      const local = elapsed - segStart - delay;
      if (local <= 0) return 0;
      if (local >= ROLL_MS) return 1;
      return local / ROLL_MS;
    }

    function render(elapsed: number) {
      let anyMoving = false;
      const seg2Active = elapsed >= SEG2_START;

      cols.forEach((c) => {
        let translateY: number;
        let p: number;
        if (seg2Active) {
          const p2 = progressFor(elapsed, SEG2_START, c.delay);
          const eased2 = easeOutBack(p2);
          translateY = -(1 - eased2) * 50;
          p = p2;
        } else {
          const p1 = progressFor(elapsed, 0, c.delay);
          const eased1 = easeOutBack(p1);
          translateY = -eased1 * 50;
          p = p1;
        }
        if (p > 0 && p < 1) anyMoving = true;
        c.track.style.transform = "translateY(" + translateY.toFixed(2) + "%)";

        // 계산 한 겹: 롤 속도(사인 피크, 구간 중앙에서 최대)에 비례한 잔상 톤 — 형태는 바꾸지 않는다.
        const velocity = Math.sin(Math.min(1, Math.max(0, p)) * Math.PI);
        c.track.style.filter = velocity > 0.01 ? "blur(" + (velocity * 1.1).toFixed(2) + "px)" : "none";
        c.track.style.boxShadow = velocity > 0.01
          ? "0 0 " + (velocity * 9).toFixed(1) + "px rgba(91, 140, 248, " + (velocity * 0.5).toFixed(2) + ")"
          : "none";
      });

      setBadge(anyMoving ? "갱신 중" : "결제 금액");

      // 계산 한 겹: 카드 하이라이트 sweep — 롤 진행률(globalP)의 함수로 패널 전체를 가로지른다.
      let globalP = -1;
      if (elapsed >= 0 && elapsed < SEG_DURATION) {
        globalP = elapsed / SEG_DURATION;
      } else if (elapsed >= SEG2_START && elapsed < SEG2_START + SEG_DURATION) {
        globalP = (elapsed - SEG2_START) / SEG_DURATION;
      }
      if (globalP >= 0) {
        const sweepOpacity = Math.sin(globalP * Math.PI);
        sweepEl!.style.opacity = (sweepOpacity * 0.8).toFixed(2);
        sweepEl!.style.transform = "translateX(" + (-120 + globalP * 240).toFixed(1) + "%)";
      } else {
        sweepEl!.style.opacity = "0";
      }
    }

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    let playing = true;
    let elapsed = reduce ? SEG2_START + SEG_DURATION : 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;
      }
      render(elapsed);
      raf = requestAnimationFrame(tick);
    }
    render(elapsed);
    raf = requestAnimationFrame(tick);

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

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

  return (
    <main className={styles.stage}>
      <div className={`${styles.ars} is-demo`} ref={rootRef}>
        <div className={styles.ars__badge}>{badge}</div>
        <button className={styles.ars__ctrl} type="button" ref={ctrlRef}>{ctrlLabel}</button>
        <div className={styles.ars__panel}>
          <div className={styles.ars__sweep} ref={sweepRef} aria-hidden="true" />
          <div className={styles.ars__digits} ref={digitsRef} />
          <span className={styles.ars__unit}>원</span>
        </div>
      </div>
    </main>
  );
}