05Price digit flip

<main class="stage">
  <div class="pf-scene is-demo">
    <div class="pf-flip">
      <div class="pf-flip__inner">
        <div class="pf-flip__face pf-flip__face--front">$29</div>
        <div class="pf-flip__face pf-flip__face--back">$19</div>
      </div>
    </div>
    <span class="pf-hint">hover</span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-enter;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

.pf-scene {
  perspective: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.pf-flip { width: 150px; height: 92px; }

.pf-flip__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform $duration $easing;
}
.pf-flip:hover .pf-flip__inner { transform: rotateX(180deg); }

.pf-flip__face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: $r-card;
  backface-visibility: hidden;
  font: 700 28px/1 -apple-system, "Segoe UI", sans-serif;
  color: $subject-cream;
}
.pf-flip__face--front { background: $subject-blue-deep; }   // 크림 글자가 얹히므로 진한 파랑
.pf-flip__face--back { background: rgba(255, 255, 255, .12); transform: rotateX(180deg); }

.pf-hint { color: $subject-cream; opacity: .55; font: 500 11px/1 -apple-system, sans-serif; }

// 데모 루프: is-demo 는 같은 회전을 무한 재생 (캡처용) — 실사용 경로(:hover)와 별개
@keyframes pf-flip {
  0%, 40% { transform: rotateX(0); }
  60%, 100% { transform: rotateX(180deg); }
}
.pf-scene.is-demo .pf-flip__inner { animation: pf-flip $duration * 2 $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .pf-flip:hover .pf-flip__inner,
  .pf-scene.is-demo .pf-flip__inner { animation: none !important; transition: none !important; 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);
}

.pf-scene {
  perspective: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.pf-flip {
  width: 150px;
  height: 92px;
}

.pf-flip__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 600ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.pf-flip:hover .pf-flip__inner {
  transform: rotateX(180deg);
}

.pf-flip__face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  backface-visibility: hidden;
  font: 700 28px/1 -apple-system, "Segoe UI", sans-serif;
  color: #fff7e6;
}

.pf-flip__face--front {
  background: #0a4fe8;
}

.pf-flip__face--back {
  background: rgba(255, 255, 255, 0.12);
  transform: rotateX(180deg);
}

.pf-hint {
  color: #fff7e6;
  opacity: 0.55;
  font: 500 11px/1 -apple-system, sans-serif;
}

@keyframes pf-flip {
  0%, 40% {
    transform: rotateX(0);
  }
  60%, 100% {
    transform: rotateX(180deg);
  }
}
.pf-scene.is-demo .pf-flip__inner {
  animation: pf-flip 1200ms cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .pf-flip:hover .pf-flip__inner,
  .pf-scene.is-demo .pf-flip__inner {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}

import { CSSProperties } from "react";
import styles from "./PriceDigitFlip.module.scss";

export interface PriceDigitFlipProps {
  duration?: string;
  easing?: string;
  front?: string;
  back?: string;
}

export default function PriceDigitFlip({
  duration = "600ms",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  front = "$29",
  back = "$19",
}: PriceDigitFlipProps) {
  const style = { "--duration": duration, "--easing": easing } as CSSProperties;
  return (
    <div className={styles.scene} style={style}>
      <div className={styles.flip}>
        <div className={styles.inner}>
          <div className={`${styles.face} ${styles.front}`}>{front}</div>
          <div className={`${styles.face} ${styles.back}`}>{back}</div>
        </div>
      </div>
      <span className={styles.hint}>hover</span>
    </div>
  );
}