03お腹をゆする笑い

<main class="stage">
<div class="bn is-demo" id="bn" data-level="0">
  <button class="bn__hit" type="button" aria-label="豆の友だちを笑わせる">
    <span class="bn__scene" aria-hidden="true">
      <span class="bn__shadow"></span>
      <span class="bn__bean" id="bnBean">
        <span class="bn__eye bn__eye--l"></span>
        <span class="bn__eye bn__eye--r"></span>
        <span class="bn__mouth"><span class="bn__tongue"></span></span>
        <span class="bn__arm bn__arm--l"></span>
        <span class="bn__arm bn__arm--r"></span>
      </span>
    </span>
  </button>
  <p class="bn__level" id="bnLevel" aria-hidden="true">笑いレベル0</p>
</div>
</main>

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

// 배 흔들기 웃음 — 눈을 반달로 접고 웃느라 몸이 기울고 배가 출렁이는 콩알 친구.
// 기울기의 원점은 발바닥(땅에 닿은 붙는 지점)이다 — 중심에 두면 발이 미끄러져 떠 보인다.
// 웃음 단계(data-level)는 기울기 진폭 --tilt 로만 커진다. 3단계에서는 몸이 앞으로 폭 접힌다.
// 정적 경로(미리보기 아님)에서도 기본 웃음 루프는 항상 돈다 — 누르면 진폭이 커질 뿐이다.

$duration: $dur-loop;
$easing: $ease-pop;
$color: $subject-lilac;

@include stage($stage-orange);

.bn { display: grid; justify-items: center; gap: $sp-2; }

.bn__hit { border: 0; padding: 0; background: none; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.bn__hit:focus-visible { outline: 2px solid $subject-ink; outline-offset: 4px; border-radius: $r-card; }

.bn__scene {
  position: relative; display: block; box-sizing: border-box;
  width: clamp(140px, 44vw, 196px); height: clamp(120px, 38vw, 168px);
}
.bn__shadow {
  position: absolute; bottom: 0; left: 50%; width: 58%; height: 12px;
  background: rgba(23, 20, 26, .2); border-radius: 50%;
  transform: translateX(-50%);
}

// 콩알 몸 — 세로로 길쭉한 알갱이. 기울기 진폭은 --tilt 변수 하나
.bn__bean {
  --tilt: 4deg;
  position: absolute; bottom: 4px; left: 50%; width: 52%; aspect-ratio: 1 / 1.18;
  background: $color; border: 3px solid $subject-ink;
  border-radius: 50% 50% 46% 46% / 42% 42% 58% 58%;
  transform: translateX(-50%);
  transform-origin: 50% 100%; // 붙는 지점: 발바닥 — 몸이 기울어도 발은 제자리
}
// 팔 — 웃으며 몸을 감싼다
.bn__arm {
  position: absolute; top: 46%; width: 26%; height: 10%;
  background: $color; border: 3px solid $subject-ink; border-radius: $r-pill;
}
.bn__arm--l { left: -12%; transform: rotate(38deg); }
.bn__arm--r { right: -12%; transform: rotate(-38deg); }

// 반달 눈 — 웃어서 감긴 호. border-top 만 있는 원호다
.bn__eye {
  position: absolute; top: 30%; width: 18%; height: 10%;
  border-top: 4px solid $subject-ink; border-radius: 50%;
}
.bn__eye--l { left: 22%; }
.bn__eye--r { right: 22%; }

// 벌린 입 — 안쪽 혀까지. 웃음에 맞춰 세로로 벌어졌다 닫힌다
.bn__mouth {
  position: absolute; top: 46%; left: 50%; width: 30%; aspect-ratio: 1 / .8;
  background: $subject-ink; border-radius: 50%;
  transform: translateX(-50%); overflow: hidden;
}
.bn__tongue {
  position: absolute; bottom: -22%; left: 50%; width: 74%; aspect-ratio: 1 / .6;
  background: $subject-pink; border-radius: 50%;
  transform: translateX(-50%);
}

// 단계 표시 — 주황 무대 위 잉크 알약
.bn__level {
  margin: 0; padding: 0 $sp-3; background: $subject-ink; color: $stage-yellow;
  border-radius: $r-pill; font-weight: 700; font-size: 12px; line-height: 20px;
}

// ── 기본 웃음 루프(정적 경로에서도 항상 돈다). 진폭은 --tilt 하나뿐이라 단계가 곧 진폭
.bn__bean {
  animation-name: bnTilt;
  animation-duration: $duration;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}
.bn__mouth {
  animation-name: bnMouth;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
@keyframes bnTilt {
  0%, 100% { transform: translateX(-50%) rotate(calc(var(--tilt) * -1)); }
  50% { transform: translateX(-50%) rotate(var(--tilt)); }
}
@keyframes bnMouth {
  0%, 100% { transform: translateX(-50%) scale(1, .8); }
  50% { transform: translateX(-50%) scale(1, 1.2); }
}

// ── 단계: 진폭이 커지다가 3단계에서 몸이 앞으로 폭 접힌다(일회성)
.bn[data-level="1"] .bn__bean { --tilt: 8deg; }
.bn[data-level="2"] .bn__bean { --tilt: 13deg; }
.bn[data-level="3"] .bn__bean {
  --tilt: 4deg;
  animation: bnFold 700ms cubic-bezier(.2, 1.4, .4, 1) 1 forwards;
}
@keyframes bnFold {
  0% { transform: translateX(-50%) rotate(0deg) scale(1, 1); }
  40% { transform: translateX(-50%) rotate(16deg) scale(1.06, .82); }
  70% { transform: translateX(-50%) rotate(20deg) scale(1.1, .68); }
  100% { transform: translateX(-50%) rotate(19deg) scale(1.08, .7); }
}

// ── 격자 미리보기 루프(2초): 같은 루프 안에서 단계가 커지다 접히고 돌아온다(90% 안에 복귀)
.bn.is-demo .bn__bean {
  animation-name: bnLaughShow;
  animation-duration: $duration;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}
@keyframes bnLaughShow {
  0%, 8% { transform: translateX(-50%) rotate(-3deg) scaleX(1); }
  16% { transform: translateX(-50%) rotate(3deg) scaleX(1.04); }
  24% { transform: translateX(-50%) rotate(-3deg) scaleX(1); }
  32% { transform: translateX(-50%) rotate(5deg) scaleX(1.06); }
  40% { transform: translateX(-50%) rotate(-5deg) scaleX(1); }
  48% { transform: translateX(-50%) rotate(5deg) scaleX(1.06); }
  56% { transform: translateX(-50%) rotate(-5deg) scaleX(1); }
  64% { transform: translateX(-50%) rotate(15deg) scale(1.06, .8); }
  72%, 84% { transform: translateX(-50%) rotate(19deg) scale(1.08, .7); }
  90%, 100% { transform: translateX(-50%) rotate(0deg) scale(1, 1); }
}

// ── 좁은 화면
@media (max-width: 340px) {
  .bn { gap: $sp-1; }
  .bn__level { font-size: 11px; line-height: 16px; }
  .bn__bean { border-width: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  // 웃임 루프를 끊면 눈을 반달로 접고 선 채 웃고 있는 모습이 남는다
  .bn__bean,
  .bn__mouth,
  .bn.is-demo .bn__bean {
    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: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.bn {
  display: grid;
  justify-items: center;
  gap: 8px;
}

.bn__hit {
  border: 0;
  padding: 0;
  background: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.bn__hit:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 4px;
  border-radius: 16px;
}

.bn__scene {
  position: relative;
  display: block;
  box-sizing: border-box;
  width: clamp(140px, 44vw, 196px);
  height: clamp(120px, 38vw, 168px);
}

.bn__shadow {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 58%;
  height: 12px;
  background: rgba(23, 20, 26, 0.2);
  border-radius: 50%;
  transform: translateX(-50%);
}

.bn__bean {
  --tilt: 4deg;
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 52%;
  aspect-ratio: 1/1.18;
  background: #b9a0ff;
  border: 3px solid #17141a;
  border-radius: 50% 50% 46% 46%/42% 42% 58% 58%;
  transform: translateX(-50%);
  transform-origin: 50% 100%;
}

.bn__arm {
  position: absolute;
  top: 46%;
  width: 26%;
  height: 10%;
  background: #b9a0ff;
  border: 3px solid #17141a;
  border-radius: 999px;
}

.bn__arm--l {
  left: -12%;
  transform: rotate(38deg);
}

.bn__arm--r {
  right: -12%;
  transform: rotate(-38deg);
}

.bn__eye {
  position: absolute;
  top: 30%;
  width: 18%;
  height: 10%;
  border-top: 4px solid #17141a;
  border-radius: 50%;
}

.bn__eye--l {
  left: 22%;
}

.bn__eye--r {
  right: 22%;
}

.bn__mouth {
  position: absolute;
  top: 46%;
  left: 50%;
  width: 30%;
  aspect-ratio: 1/0.8;
  background: #17141a;
  border-radius: 50%;
  transform: translateX(-50%);
  overflow: hidden;
}

.bn__tongue {
  position: absolute;
  bottom: -22%;
  left: 50%;
  width: 74%;
  aspect-ratio: 1/0.6;
  background: #ff9ebb;
  border-radius: 50%;
  transform: translateX(-50%);
}

.bn__level {
  margin: 0;
  padding: 0 12px;
  background: #17141a;
  color: #ffd23f;
  border-radius: 999px;
  font-weight: 700;
  font-size: 12px;
  line-height: 20px;
}

.bn__bean {
  animation-name: bnTilt;
  animation-duration: 2s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

.bn__mouth {
  animation-name: bnMouth;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes bnTilt {
  0%, 100% {
    transform: translateX(-50%) rotate(calc(var(--tilt) * -1));
  }
  50% {
    transform: translateX(-50%) rotate(var(--tilt));
  }
}
@keyframes bnMouth {
  0%, 100% {
    transform: translateX(-50%) scale(1, 0.8);
  }
  50% {
    transform: translateX(-50%) scale(1, 1.2);
  }
}
.bn[data-level="1"] .bn__bean {
  --tilt: 8deg;
}

.bn[data-level="2"] .bn__bean {
  --tilt: 13deg;
}

.bn[data-level="3"] .bn__bean {
  --tilt: 4deg;
  animation: bnFold 700ms cubic-bezier(0.2, 1.4, 0.4, 1) 1 forwards;
}

@keyframes bnFold {
  0% {
    transform: translateX(-50%) rotate(0deg) scale(1, 1);
  }
  40% {
    transform: translateX(-50%) rotate(16deg) scale(1.06, 0.82);
  }
  70% {
    transform: translateX(-50%) rotate(20deg) scale(1.1, 0.68);
  }
  100% {
    transform: translateX(-50%) rotate(19deg) scale(1.08, 0.7);
  }
}
.bn.is-demo .bn__bean {
  animation-name: bnLaughShow;
  animation-duration: 2s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

@keyframes bnLaughShow {
  0%, 8% {
    transform: translateX(-50%) rotate(-3deg) scaleX(1);
  }
  16% {
    transform: translateX(-50%) rotate(3deg) scaleX(1.04);
  }
  24% {
    transform: translateX(-50%) rotate(-3deg) scaleX(1);
  }
  32% {
    transform: translateX(-50%) rotate(5deg) scaleX(1.06);
  }
  40% {
    transform: translateX(-50%) rotate(-5deg) scaleX(1);
  }
  48% {
    transform: translateX(-50%) rotate(5deg) scaleX(1.06);
  }
  56% {
    transform: translateX(-50%) rotate(-5deg) scaleX(1);
  }
  64% {
    transform: translateX(-50%) rotate(15deg) scale(1.06, 0.8);
  }
  72%, 84% {
    transform: translateX(-50%) rotate(19deg) scale(1.08, 0.7);
  }
  90%, 100% {
    transform: translateX(-50%) rotate(0deg) scale(1, 1);
  }
}
@media (max-width: 340px) {
  .bn {
    gap: 4px;
  }
  .bn__level {
    font-size: 11px;
    line-height: 16px;
  }
  .bn__bean {
    border-width: 2px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .bn__bean,
  .bn__mouth,
  .bn.is-demo .bn__bean {
    animation: none !important;
  }
}

var bn = document.getElementById('bn');
var level = 0;
var labels = ['笑いレベル0', '笑いレベル1', '笑いレベル2', '笑いレベル3 — 大爆笑'];

// 누를 때마다 웃음 단계가 0→1→2→3 까지 커지고, もう一度 누르면 처음으로 돌아간다
document.querySelector('.bn__hit').addEventListener('click', function () {
  bn.classList.remove('is-demo');
  level = (level + 1) % 4;
  bn.dataset.level = String(level);
  document.getElementById('bnLevel').textContent = labels[level];
});
bn.addEventListener('pointerdown', function () { bn.classList.remove('is-demo'); });

// CuteBellyLaughBean — vanilla 판(run/075/demo/03-cute-belly-laugh-bean) 의 React 포트.
// 누를 때마다 웃음 단계가 0→1→2→3 까지 커지고 다시 누르면 처음으로 돌아간다(data-level).
import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./CuteBellyLaughBean.module.scss";

export type CuteBellyLaughBeanProps = {
  duration?: number;
  easing?: string;
  color?: string;
};

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

const LABELS = ["웃음 0단계", "웃음 1단계", "웃음 2단계", "웃음 3단계 — 폭 접힘"];

export default function CuteBellyLaughBean(props: CuteBellyLaughBeanProps) {
  const duration = props.duration ?? 2000;
  const easing = props.easing ?? "cubic-bezier(.2, 1.4, .4, 1)";
  const color = props.color ?? "#b9a0ff";
  const [level, setLevel] = useState<number>(0);
  const [preview, setPreview] = useState<boolean>(true);
  const vars: Vars = { "--duration": duration + "ms", "--easing": easing, "--color": color };

  return (
    <main className={styles.stage}>
      <div
        className={styles.bn + (preview ? " " + styles.isDemo : "")}
        style={vars}
        data-level={level}
      >
        <button
          className={styles.hit}
          type="button"
          aria-label="콩알 친구 웃기기"
          onClick={() => setLevel((level + 1) % 4)}
          onPointerDown={() => setPreview(false)}
        >
          <span className={styles.scene} aria-hidden="true">
            <span className={styles.shadow}></span>
            <span className={styles.bean} key={"fold" + level}>
              <span className={styles.eye + " " + styles.eyeL}></span>
              <span className={styles.eye + " " + styles.eyeR}></span>
              <span className={styles.mouth}><span className={styles.tongue}></span></span>
              <span className={styles.arm + " " + styles.armL}></span>
              <span className={styles.arm + " " + styles.armR}></span>
            </span>
          </span>
        </button>
        <p className={styles.level} aria-hidden="true">{LABELS[level]}</p>
      </div>
    </main>
  );
}