03Rung như thạch (purupuru)

<main class="stage">
  <button class="icon o-puru is-demo" type="button" aria-label="Yêu thích">
    <svg viewBox="0 0 24 24" width="26" height="26" aria-hidden="true"><path d="M12 21s-7.5-4.6-10-9.3C.4 8 2 4.5 5.6 4 8 3.6 10 5 12 7c2-2 4-3.4 6.4-3 3.6.5 5.2 4 3.6 7.7C19.5 16.4 12 21 12 21z" fill="currentColor"/></svg>
  </button>
  <span class="tag">Rung rinh</span>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 900ms;
$easing: ease-in-out;
$color: $subject-cream;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-orange);
.stage { position: relative; }

.icon {
  width: 64px;
  height: 64px;
  border: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: $stage-ink;
  color: $color;
  cursor: pointer;
  box-shadow: $shadow-raised;
}
.tag {
  position: absolute;
  top: $sp-4;
  right: $sp-4;
  padding: $sp-1 $sp-3;
  border-radius: $r-sm;
  background: rgba($subject-cream, .25);   // 먹 틴트는 주황 면을 어둡게 해 잉크 글자가 4.32:1 이었다 — 크림 틴트로 7.00:1
  color: $stage-ink;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: .04em;
}

// ── 사인파 soft-body 진동 — scale(1+δ, 1-δ·φ) 로 부피를 보존한 채 위상차로 흔든다 ──
// δ = 0.07·sin(2πt), 세로는 가로보다 위상이 π/2 늦는 cos 을 쓴다(직교 성분 — 서로 반대로 출렁).
// scaleX 가 최대인 순간 scaleY 는 0을 지난다 — 몸이 한 방향으로 눌리면 다른 방향은 잠시 쉰다 (형태 2차, 사용자 2026-09-14).
// keyframes 네 지점은 t = pct/100·2π 대입 결과: 25%→sin 1·cos 0 / 50%→sin 0·cos -1 / 75%→sin -1·cos 0
.o-puru {
  animation: o-puru $duration $easing infinite;
}
@keyframes o-puru {
  0%, 100% { transform: scale(1, 1); }
  25%      { transform: scale(1.07, .94); }
  50%      { transform: scale(1, 1.07); }
  75%      { transform: scale(.93, 1); }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .o-puru { animation: none; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  position: relative;
}

.icon {
  width: 64px;
  height: 64px;
  border: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #17141a;
  color: #fff7e6;
  cursor: pointer;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 8px;
  background: rgba(255, 247, 230, 0.25);
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}

.o-puru {
  animation: o-puru 900ms ease-in-out infinite;
}

@keyframes o-puru {
  0%, 100% {
    transform: scale(1, 1);
  }
  25% {
    transform: scale(1.07, 0.94);
  }
  50% {
    transform: scale(1, 1.07);
  }
  75% {
    transform: scale(0.93, 1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .o-puru {
    animation: none;
  }
}

import type { CSSProperties, MouseEvent } from "react";
import styles from "./JellyHeartIcon.module.scss";

export type JellyHeartIconProps = {
  /** 스크린리더용 라벨 (기본 "찜하기") */
  label?: string;
  /** 한 번 떠는 데 걸리는 시간 (기본 900ms) */
  duration?: number;
  easing?: string;
  color?: string;
  onClick?: (e: MouseEvent<HTMLButtonElement>) => void;
};

type Vars = CSSProperties & {
  "--duration"?: string;
  "--easing"?: string;
  "--color"?: string;
};

export default function JellyHeartIcon({
  label = "찜하기",
  duration = 900,
  easing = "ease-in-out",
  color = "#fff7e6",
  onClick,
}: JellyHeartIconProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <button type="button" className={styles.icon} style={vars} aria-label={label} onClick={onClick}>
      <svg viewBox="0 0 24 24" width="26" height="26" aria-hidden="true">
        <path
          d="M12 21s-7.5-4.6-10-9.3C.4 8 2 4.5 5.6 4 8 3.6 10 5 12 7c2-2 4-3.4 6.4-3 3.6.5 5.2 4 3.6 7.7C19.5 16.4 12 21 12 21z"
          fill="currentColor"
        />
      </svg>
    </button>
  );
}