06Emoji burst count badge

<main class="stage">
  <div class="bc is-demo">
    <button type="button" class="bc__btn" aria-label="Leave a heart reaction">
      <span class="bc__emoji" aria-hidden="true">❤️</span>
      <span class="bc__burst" aria-hidden="true"></span>
    </button>
    <span class="bc__count" aria-live="polite"><span class="sr-only">Reaction count</span> 12</span>
  </div>
</main>

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

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

@include stage($stage-yellow);

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.bc { display: flex; align-items: center; gap: $sp-3; }
.bc__btn {
  position: relative;
  display: grid; place-items: center;
  width: $sp-12; height: $sp-12;
  border: 0; border-radius: 50%;
  background: $subject-cream;
  box-shadow: $shadow-press;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.bc__emoji { display: inline-block; font-size: 24px; transform: scale(1); }
.bc__burst {
  position: absolute; inset: 0; border-radius: 50%;
  background:
    radial-gradient($color 40%, transparent 41%) 50% 4% / 6px 6px no-repeat,
    radial-gradient($color 40%, transparent 41%) 96% 50% / 6px 6px no-repeat,
    radial-gradient($color 40%, transparent 41%) 50% 96% / 6px 6px no-repeat,
    radial-gradient($color 40%, transparent 41%) 4% 50% / 6px 6px no-repeat;
  opacity: 0;
  transform: scale(.4);
}
.bc__count {
  font-weight: 700; font-size: 15px; font-family: inherit; color: $subject-ink;
}
.bc.is-play .bc__emoji { animation: bc-emoji-jelly $duration $easing; }
.bc.is-play .bc__burst { animation: bc-burst $duration $easing; }
@keyframes bc-emoji {
  0%   { transform: scale(1); }
  35%  { transform: scale(1.5); }
  60%  { transform: scale(.9); }
  100% { transform: scale(1); }
}
// 젤리 스트레치: 피크에서 x/y 눌림-늘림을 교차시켜 바운스에 물성을 얹는다
@keyframes bc-emoji-jelly {
  0%   { transform: scale(1); }
  35%  { transform: scaleX(1.35) scaleY(.8); }
  60%  { transform: scaleX(.85) scaleY(1.15); }
  100% { transform: scale(1); }
}
@keyframes bc-burst {
  0%   { opacity: 1; transform: scale(.4); }
  70%  { opacity: .5; }
  100% { opacity: 0; transform: scale(1.6); }
}

@media (prefers-reduced-motion: reduce) {
  .bc.is-play .bc__emoji, .bc.is-play .bc__burst { animation: none !important; }
}

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);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.bc {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bc__btn {
  position: relative;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: #fff7e6;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.bc__emoji {
  display: inline-block;
  font-size: 24px;
  transform: scale(1);
}

.bc__burst {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(#2f6df6 40%, transparent 41%) 50% 4%/6px 6px no-repeat, radial-gradient(#2f6df6 40%, transparent 41%) 96% 50%/6px 6px no-repeat, radial-gradient(#2f6df6 40%, transparent 41%) 50% 96%/6px 6px no-repeat, radial-gradient(#2f6df6 40%, transparent 41%) 4% 50%/6px 6px no-repeat;
  opacity: 0;
  transform: scale(0.4);
}

.bc__count {
  font-weight: 700;
  font-size: 15px;
  font-family: inherit;
  color: #17141a;
}

.bc.is-play .bc__emoji {
  animation: bc-emoji-jelly 600ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.bc.is-play .bc__burst {
  animation: bc-burst 600ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

@keyframes bc-emoji {
  0% {
    transform: scale(1);
  }
  35% {
    transform: scale(1.5);
  }
  60% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes bc-emoji-jelly {
  0% {
    transform: scale(1);
  }
  35% {
    transform: scaleX(1.35) scaleY(0.8);
  }
  60% {
    transform: scaleX(0.85) scaleY(1.15);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes bc-burst {
  0% {
    opacity: 1;
    transform: scale(0.4);
  }
  70% {
    opacity: 0.5;
  }
  100% {
    opacity: 0;
    transform: scale(1.6);
  }
}
@media (prefers-reduced-motion: reduce) {
  .bc.is-play .bc__emoji, .bc.is-play .bc__burst {
    animation: none !important;
  }
}

// 실제 동작: 누를 때마다 이모지가 튀고 점이 흩어지며 카운트가 1 올라간다 (12줄)
var bc = document.querySelector('.bc'), btn = bc.querySelector('.bc__btn'), countEl = bc.querySelector('.bc__count');
var n = 12;
function burst() {
  bc.classList.remove('is-play'); void bc.offsetWidth; bc.classList.add('is-play');
  n++; countEl.lastChild.textContent = ' ' + n;
}
btn.addEventListener('click', function () { bc.classList.remove('is-demo'); clearInterval(loop); burst(); });
// .is-demo 자동 순환 — 일정 간격으로 스스로 누른다 (실제 클릭이 오면 멈춘다)
burst();
var loop = setInterval(burst, 1100);

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./EmojiReactionBurstCountBadge.module.scss";

export type EmojiReactionBurstCountBadgeProps = {
  ariaLabel?: string;
  emoji?: string;
  initialCount?: number;
  duration?: number;
  easing?: string;
  burstColor?: string;
};

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

export default function EmojiReactionBurstCountBadge({
  ariaLabel = "Leave a heart reaction",
  emoji = "❤️",
  initialCount = 12,
  duration = 600,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  burstColor = "#2f6df6",
}: EmojiReactionBurstCountBadgeProps) {
  const [count, setCount] = useState(initialCount);
  const [playKey, setPlayKey] = useState(0);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--burst": burstColor };

  function react() {
    setCount((c) => c + 1);
    setPlayKey((k) => k + 1);
  }

  return (
    <div className={styles.bc} style={vars}>
      <button type="button" className={styles.btn} aria-label={ariaLabel} onClick={react}>
        <span className={styles.emoji} key={`e${playKey}`} data-play={playKey > 0}>{emoji}</span>
        <span className={styles.burst} key={`b${playKey}`} data-play={playKey > 0} aria-hidden="true" />
      </button>
      <span className={styles.count} aria-live="polite">
        <span className={styles.srOnly}>Reaction count</span> {count}
      </span>
    </div>
  );
}