02Bouncy check

<main class="stage">
  <label class="check is-demo">
    <input type="checkbox" class="sr-input">
    <span class="box" aria-hidden="true">
      <svg viewBox="0 0 24 24" class="box__svg"><path class="box__path" d="M5 12.5 L10 17.5 L19 7" /></svg>
    </span>
    <span class="check__text">Get notifications</span>
  </label>
</main>

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

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

// ── 데모 무대 ───────────────────────────────
@include stage($stage-yellow);

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

.check { display: inline-flex; align-items: center; gap: 12px; cursor: pointer;
         font-weight: 700; font-size: clamp(14px, 4vw, 17px); line-height: 1.3; font-family: inherit; color: $color; }
.box {
  flex: none; width: 28px; height: 28px; border-radius: 50%;
  border: 2px solid rgba($color, .5); background: transparent;
  display: grid; place-items: center; transition: background $dur-quick $ease-out;
}
.sr-input:checked ~ .box { background: $color; border-color: $color; }
.sr-input:focus-visible ~ .box { box-shadow: 0 0 0 3px rgba($color, .35); }
.box__svg {
  width: 16px; height: 16px; overflow: visible;
  transform: scale(0); opacity: 0;
}
.box__path { fill: none; stroke: $stage-yellow; stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.sr-input:checked ~ .box .box__svg { animation: check-pop $duration $easing forwards; }

@keyframes check-pop {
  0%   { transform: scale(0); opacity: 0; }
  55%  { transform: scale(1.3); opacity: 1; }
  75%  { transform: scale(.9); }
  100% { transform: scale(1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  // 접근성: 움직임 줄이기 설정이면 트랜지션을 즉시 끝낸다
  .box__svg { animation: none !important; }
  .sr-input:checked ~ .box .box__svg { transform: scale(1); opacity: 1; }
}

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

.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;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  font-weight: 700;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1.3;
  font-family: inherit;
  color: #17141a;
}

.box {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(23, 20, 26, 0.5);
  background: transparent;
  display: grid;
  place-items: center;
  transition: background 220ms ease-out;
}

.sr-input:checked ~ .box {
  background: #17141a;
  border-color: #17141a;
}

.sr-input:focus-visible ~ .box {
  box-shadow: 0 0 0 3px rgba(23, 20, 26, 0.35);
}

.box__svg {
  width: 16px;
  height: 16px;
  overflow: visible;
  transform: scale(0);
  opacity: 0;
}

.box__path {
  fill: none;
  stroke: #ffd23f;
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sr-input:checked ~ .box .box__svg {
  animation: check-pop 600ms cubic-bezier(0.2, 1.4, 0.4, 1) forwards;
}

@keyframes check-pop {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  55% {
    transform: scale(1.3);
    opacity: 1;
  }
  75% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .box__svg {
    animation: none !important;
  }
  .sr-input:checked ~ .box .box__svg {
    transform: scale(1);
    opacity: 1;
  }
}

// .is-demo 데모용 자동 토글. 실제로는 클릭이 :checked 를 바꾼다 (4줄)
document.querySelectorAll('.is-demo .sr-input').forEach(function (el) {
  var t = function () { el.checked = !el.checked; };
  t(); setInterval(t, 600);
});

import { useState } from "react";
import type { CSSProperties, ChangeEvent } from "react";
import styles from "./BounceCheck.module.scss";

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

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

export default function BounceCheck({
  label = "Get notifications",
  duration = 600,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#17141a",
}: BounceCheckProps) {
  const [checked, setChecked] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <label className={styles.check} style={vars}>
      <input
        type="checkbox"
        className={styles.srInput}
        checked={checked}
        onChange={(e: ChangeEvent<HTMLInputElement>) => setChecked(e.target.checked)}
      />
      <span className={styles.box} aria-hidden="true">
        {checked && (
          <svg viewBox="0 0 24 24" className={styles.boxSvg}>
            <path className={styles.boxPath} d="M5 12.5 L10 17.5 L19 7" />
          </svg>
        )}
      </span>
      <span>{label}</span>
    </label>
  );
}