08Agree-to-all switch that lights the items below in turn

<main class="stage">
  <section class="ta is-demo" id="ta" aria-label="Terms agreement block">
    <div class="ta__all">
      <span class="ta__ic" aria-hidden="true"><svg viewBox="0 0 256 256" fill="currentColor"><path d="M216,48V208a8,8,0,0,1-8,8H48a8,8,0,0,1-8-8V48a8,8,0,0,1,8-8H208A8,8,0,0,1,216,48Z" opacity="0.2"/><path d="M173.66,98.34a8,8,0,0,1,0,11.32l-56,56a8,8,0,0,1-11.32,0l-24-24a8,8,0,0,1,11.32-11.32L112,148.69l50.34-50.35A8,8,0,0,1,173.66,98.34ZM224,48V208a16,16,0,0,1-16,16H48a16,16,0,0,1-16-16V48A16,16,0,0,1,48,32H208A16,16,0,0,1,224,48ZM208,208V48H48V208H208Z"/></svg></span>
      <label class="ta__allText" for="ta-all">Agree to all</label>
      <input class="ta__switch" type="checkbox" id="ta-all">
    </div>

    <ul class="ta__list">
      <li class="ta__row">
        <input class="ta__box" type="checkbox" id="ta-1">
        <label class="ta__mark" for="ta-1" aria-hidden="true"><svg viewBox="0 0 24 24" aria-hidden="true"><polyline class="ta__tick" points="5 12.5 10 17 19 7" pathLength="1" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg></label>
        <label class="ta__text" for="ta-1">Terms of service (required)</label>
      </li>
      <li class="ta__row">
        <input class="ta__box" type="checkbox" id="ta-2">
        <label class="ta__mark" for="ta-2" aria-hidden="true"><svg viewBox="0 0 24 24" aria-hidden="true"><polyline class="ta__tick" points="5 12.5 10 17 19 7" pathLength="1" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg></label>
        <label class="ta__text" for="ta-2">Personal data collection (required)</label>
      </li>
      <li class="ta__row">
        <input class="ta__box" type="checkbox" id="ta-3">
        <label class="ta__mark" for="ta-3" aria-hidden="true"><svg viewBox="0 0 24 24" aria-hidden="true"><polyline class="ta__tick" points="5 12.5 10 17 19 7" pathLength="1" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg></label>
        <label class="ta__text" for="ta-3">Payment provider terms (required)</label>
      </li>
      <li class="ta__row">
        <input class="ta__box" type="checkbox" id="ta-4">
        <label class="ta__mark" for="ta-4" aria-hidden="true"><svg viewBox="0 0 24 24" aria-hidden="true"><polyline class="ta__tick" points="5 12.5 10 17 19 7" pathLength="1" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg></label>
        <label class="ta__text" for="ta-4">Marketing emails (optional)</label>
      </li>
    </ul>
  </section>
</main>

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

// 전체 동의를 켜면 아래 네 칸의 체크 표시가 stroke-dashoffset 으로 차례차례 그려진다.
// 시차는 animation-delay 가 주고, 지연 구간을 채우는 건 animation-fill-mode: backwards 다
// — 없으면 첫 프레임에 네 개가 다 그려진 채로 한 번 번쩍인다.
$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-ink;

@include stage($stage-orange);

.ta {
  box-sizing: border-box;
  width: min(300px, 92vw);
  padding: $sp-3;
  border-radius: $r-card;
  background: $subject-cream;
  color: $color;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}
.ta * { box-sizing: border-box; }

// ── 전체 동의 줄 ──
.ta__all {
  display: flex;
  align-items: center;
  gap: $sp-2;
  padding: 0 0 $sp-3;
  border-bottom: 1px solid rgba(23, 20, 26, .12);
}
.ta__ic {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  color: $color;
}
.ta__ic svg { width: 100%; height: 100%; }
.ta__allText {
  margin-right: auto;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
}
.ta__switch {
  position: relative;
  flex: 0 0 auto;
  width: 30px;
  height: 16px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: $r-pill;
  background-color: rgba(23, 20, 26, .2);
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  transition: background-color $dur-quick $easing;
  &::after {
    content: "";
    position: absolute;
    top: 2px;
    left: 2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: $subject-cream;
    transition: transform $dur-quick $ease-spring;
  }
  &:checked { background-color: $color; }
  &:checked::after { transform: translateX(14px); }
  // 일부만 켜진 상태 — 전체 동의는 풀렸지만 아래는 남아 있다
  &:indeterminate { background-color: rgba(23, 20, 26, .45); }
  &:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
}

// ── 약관 네 줄 ──
.ta__list {
  display: grid;
  gap: $sp-2;
  margin: $sp-3 0 0;
  padding: 0;
  list-style: none;
}
.ta__row {
  position: relative;
  display: flex;
  align-items: center;
  gap: $sp-2;
}
.ta__row:nth-child(1) { --i: 0; }
.ta__row:nth-child(2) { --i: 1; }
.ta__row:nth-child(3) { --i: 2; }
.ta__row:nth-child(4) { --i: 3; }

.ta__box {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  opacity: 0;
}
.ta__mark {
  position: relative;
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 2px solid rgba(23, 20, 26, .26);
  border-radius: $r-xs;
  color: $subject-cream;
  cursor: pointer;
  // 칸이 차는 것은 scale — 켤 때는 한 프레임에 차고, 끌 때는 천천히 줄어든다.
  // 투명도가 아니라 크기라서 중간 프레임에 반투명 유령이 안 생긴다
  &::before {
    content: "";
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    background-color: $color;
    transform: scale(0);
    transition: transform $dur-quick $easing;
    transition-delay: calc(var(--i, 0) * 60ms);
  }
}
.ta__mark svg {
  position: relative;
  z-index: 1;
  width: 14px;
  height: 14px;
}
// 체크는 폴리라인 한 줄이다 — 길이를 1 로 정규화해 두면 dashoffset 1 → 0 이 곧 「왼쪽부터 그린다」
.ta__tick {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset $dur-base $easing;
  transition-delay: calc(var(--i, 0) * 60ms);
}
.ta__box:checked ~ .ta__mark::before { transform: scale(1); }
.ta__box:checked ~ .ta__mark .ta__tick { stroke-dashoffset: 0; }
.ta__box:focus-visible ~ .ta__mark {
  outline: 2px solid $color;
  outline-offset: 2px;
}
.ta__text {
  font-size: 11px;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
}

// ── 격자 미리보기 루프 ──
// 켜짐(6% 부터 60ms 씩)은 한 프레임에 톡, 꺼짐(46~80%)은 여덟 프레임에 걸쳐 천천히.
// 그래야 한 프레임에 가장 크게 달라지는 장면이 「차례로 켜지는 중」 이지 「꺼지는 중」 이 아니다.
// 구간마다 다른 이징이 필요하므로 타이밍 함수를 키프레임 안에 적는다
@keyframes taFill {
  0% { transform: scale(0); animation-timing-function: steps(1, end); }
  6% { transform: scale(0); animation-timing-function: $ease-pop; }
  10% { transform: scale(1); animation-timing-function: steps(1, end); }
  46% { transform: scale(1); animation-timing-function: linear; }
  80%, 100% { transform: scale(0); }
}
@keyframes taDraw {
  0%, 10% { stroke-dashoffset: 1; }
  24%, 46% { stroke-dashoffset: 0; }
  66%, 100% { stroke-dashoffset: 1; }
}
@keyframes taSwitchOn {
  0% { background-color: rgba(23, 20, 26, .2); }
  2%, 70% { background-color: $color; }
  84%, 100% { background-color: rgba(23, 20, 26, .2); }
}
@keyframes taThumb {
  0%, 2% { transform: translateX(0); }
  10%, 70% { transform: translateX(14px); }
  80%, 100% { transform: translateX(0); }
}
.ta.is-demo {
  .ta__switch {
    animation-name: taSwitchOn;
    animation-duration: $duration;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .ta__switch::after {
    animation-name: taThumb;
    animation-duration: $duration;
    animation-timing-function: $ease-spring;
    animation-iteration-count: infinite;
  }
  .ta__mark::before {
    animation-name: taFill;
    animation-duration: $duration;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
    animation-fill-mode: backwards;
    animation-delay: calc(var(--i, 0) * 60ms);
  }
  .ta__tick {
    animation-name: taDraw;
    animation-duration: $duration;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
    animation-fill-mode: backwards;
    animation-delay: calc(var(--i, 0) * 60ms);
  }
}

@media (max-width: 340px) {
  .ta { padding: $sp-2; }
  .ta__all { padding-bottom: $sp-2; }
  .ta__list { gap: $sp-1; margin-top: $sp-2; }
  .ta__allText { font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .ta__switch,
  .ta__switch::after,
  .ta__tick,
  .ta__mark::before { transition: none !important; }
  .ta.is-demo .ta__switch,
  .ta.is-demo .ta__switch::after,
  .ta.is-demo .ta__mark::before,
  .ta.is-demo .ta__tick { 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);
}

.ta {
  box-sizing: border-box;
  width: min(300px, 92vw);
  padding: 12px;
  border-radius: 16px;
  background: #fff7e6;
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.ta * {
  box-sizing: border-box;
}

.ta__all {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 0 12px;
  border-bottom: 1px solid rgba(23, 20, 26, 0.12);
}

.ta__ic {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  color: #17141a;
}

.ta__ic svg {
  width: 100%;
  height: 100%;
}

.ta__allText {
  margin-right: auto;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
}

.ta__switch {
  position: relative;
  flex: 0 0 auto;
  width: 30px;
  height: 16px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background-color: rgba(23, 20, 26, 0.2);
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  transition: background-color 220ms ease-out;
}
.ta__switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff7e6;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.ta__switch:checked {
  background-color: #17141a;
}
.ta__switch:checked::after {
  transform: translateX(14px);
}
.ta__switch:indeterminate {
  background-color: rgba(23, 20, 26, 0.45);
}
.ta__switch:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.ta__list {
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.ta__row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ta__row:nth-child(1) {
  --i: 0;
}

.ta__row:nth-child(2) {
  --i: 1;
}

.ta__row:nth-child(3) {
  --i: 2;
}

.ta__row:nth-child(4) {
  --i: 3;
}

.ta__box {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  opacity: 0;
}

.ta__mark {
  position: relative;
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 2px solid rgba(23, 20, 26, 0.26);
  border-radius: 4px;
  color: #fff7e6;
  cursor: pointer;
}
.ta__mark::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background-color: #17141a;
  transform: scale(0);
  transition: transform 220ms ease-out;
  transition-delay: calc(var(--i, 0) * 60ms);
}

.ta__mark svg {
  position: relative;
  z-index: 1;
  width: 14px;
  height: 14px;
}

.ta__tick {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 300ms ease-out;
  transition-delay: calc(var(--i, 0) * 60ms);
}

.ta__box:checked ~ .ta__mark::before {
  transform: scale(1);
}

.ta__box:checked ~ .ta__mark .ta__tick {
  stroke-dashoffset: 0;
}

.ta__box:focus-visible ~ .ta__mark {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

.ta__text {
  font-size: 11px;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
}

@keyframes taFill {
  0% {
    transform: scale(0);
    animation-timing-function: steps(1, end);
  }
  6% {
    transform: scale(0);
    animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  }
  10% {
    transform: scale(1);
    animation-timing-function: steps(1, end);
  }
  46% {
    transform: scale(1);
    animation-timing-function: linear;
  }
  80%, 100% {
    transform: scale(0);
  }
}
@keyframes taDraw {
  0%, 10% {
    stroke-dashoffset: 1;
  }
  24%, 46% {
    stroke-dashoffset: 0;
  }
  66%, 100% {
    stroke-dashoffset: 1;
  }
}
@keyframes taSwitchOn {
  0% {
    background-color: rgba(23, 20, 26, 0.2);
  }
  2%, 70% {
    background-color: #17141a;
  }
  84%, 100% {
    background-color: rgba(23, 20, 26, 0.2);
  }
}
@keyframes taThumb {
  0%, 2% {
    transform: translateX(0);
  }
  10%, 70% {
    transform: translateX(14px);
  }
  80%, 100% {
    transform: translateX(0);
  }
}
.ta.is-demo .ta__switch {
  animation-name: taSwitchOn;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.ta.is-demo .ta__switch::after {
  animation-name: taThumb;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.ta.is-demo .ta__mark::before {
  animation-name: taFill;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
  animation-delay: calc(var(--i, 0) * 60ms);
}
.ta.is-demo .ta__tick {
  animation-name: taDraw;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
  animation-delay: calc(var(--i, 0) * 60ms);
}

@media (max-width: 340px) {
  .ta {
    padding: 8px;
  }
  .ta__all {
    padding-bottom: 8px;
  }
  .ta__list {
    gap: 4px;
    margin-top: 8px;
  }
  .ta__allText {
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ta__switch,
  .ta__switch::after,
  .ta__tick,
  .ta__mark::before {
    transition: none !important;
  }
  .ta.is-demo .ta__switch,
  .ta.is-demo .ta__switch::after,
  .ta.is-demo .ta__mark::before,
  .ta.is-demo .ta__tick {
    animation: none !important;
  }
}

// 전체 동의는 아래 네 칸을 한꺼번에 켜고, 한 칸만 꺼지면 자기만 조용히 풀린다.
// 「몇 개는 켜져 있다」 는 상태는 indeterminate 가 그대로 갖고 있다 — 별도 클래스가 필요 없다.
var ta = document.getElementById('ta');
var master = document.getElementById('ta-all');
var boxes = ta.querySelectorAll('.ta__box');
function sync() {
  var on = 0;
  for (var i = 0; i < boxes.length; i++) { if (boxes[i].checked) { on++; } }
  master.checked = on === boxes.length;
  master.indeterminate = on > 0 && on < boxes.length;
}
master.addEventListener('change', function () {
  ta.classList.remove('is-demo');
  for (var i = 0; i < boxes.length; i++) { boxes[i].checked = master.checked; }
  master.indeterminate = false;
});
for (var n = 0; n < boxes.length; n++) {
  boxes[n].addEventListener('change', function () {
    ta.classList.remove('is-demo');
    sync();
  });
}

import { useEffect, useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./TermsAgreeAllCascade.module.scss";

export type TermsAgreeAllCascadeProps = {
  allLabel?: string;
  items?: string[];
  groupLabel?: string;
  /** 격자 미리보기용 2초 자동 루프. 사람이 손대면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type RowVars = CSSProperties & { "--i"?: number };
// ambient 가 얇아 DOM 요소 타입을 못 쓴다 — 필요한 꼴만 로컬 타입으로 선언
type Toggle = { indeterminate: boolean };

function CheckSquareIcon() {
  return (
    <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M216,48V208a8,8,0,0,1-8,8H48a8,8,0,0,1-8-8V48a8,8,0,0,1,8-8H208A8,8,0,0,1,216,48Z" opacity="0.2"/><path d="M173.66,98.34a8,8,0,0,1,0,11.32l-56,56a8,8,0,0,1-11.32,0l-24-24a8,8,0,0,1,11.32-11.32L112,148.69l50.34-50.35A8,8,0,0,1,173.66,98.34ZM224,48V208a16,16,0,0,1-16,16H48a16,16,0,0,1-16-16V48A16,16,0,0,1,48,32H208A16,16,0,0,1,224,48ZM208,208V48H48V208H208Z"/></svg>
  );
}

export default function TermsAgreeAllCascade({
  allLabel = "전체 동의",
  items = [
    "이용약관 동의 (필수)",
    "개인정보 수집 (필수)",
    "결제 대행 서비스 (필수)",
    "마케팅 정보 수신 (선택)",
  ],
  groupLabel = "약관 동의 묶음",
  demo = true,
  duration = 2000,
  easing = "ease-out",
  color = "#17141a",
}: TermsAgreeAllCascadeProps) {
  const [checked, setChecked] = useState<boolean[]>(items.map(() => false));
  const [live, setLive] = useState(demo);
  const masterRef = useRef<Toggle>(null);

  const on = checked.filter(Boolean).length;
  const all = on === items.length && on > 0;

  // 「몇 개는 켜져 있다」 는 상태는 속성으로만 있다 — 렌더 뒤에 직접 놓는다
  useEffect(() => {
    const el = masterRef.current;
    if (!el) return;
    el.indeterminate = on > 0 && on < items.length;
  }, [on, items.length]);

  function toggleAll(next: boolean) {
    setLive(false);
    setChecked(items.map(() => next));
  }

  function toggleOne(index: number, next: boolean) {
    setLive(false);
    setChecked((prev) => prev.map((was, n) => (n === index ? next : was)));
  }

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const cls = [styles.ta, live ? styles.isDemo : ""].filter(Boolean).join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <div className={styles.all}>
        <span className={styles.ic} aria-hidden="true"><CheckSquareIcon /></span>
        <label className={styles.allText} htmlFor="ta-all">{allLabel}</label>
        <input
          className={styles.switch}
          type="checkbox"
          id="ta-all"
          ref={masterRef}
          checked={all}
          onChange={(event: { target: { checked: boolean } }) => toggleAll(event.target.checked)}
        />
      </div>

      <ul className={styles.list}>
        {items.map((text, n) => {
          const rowVars: RowVars = { "--i": n };
          const id = `ta-${n + 1}`;
          return (
            <li className={styles.row} style={rowVars} key={text}>
              <input
                className={styles.box}
                type="checkbox"
                id={id}
                checked={checked[n]}
                onChange={(event: { target: { checked: boolean } }) => toggleOne(n, event.target.checked)}
              />
              <label className={styles.mark} htmlFor={id} aria-hidden="true">
                <svg viewBox="0 0 24 24" aria-hidden="true">
                  <polyline
                    className={styles.tick}
                    points="5 12.5 10 17 19 7"
                    pathLength="1"
                    fill="none"
                    stroke="currentColor"
                    strokeWidth="3"
                    strokeLinecap="round"
                    strokeLinejoin="round"
                  />
                </svg>
              </label>
              <label className={styles.text} htmlFor={id}>{text}</label>
            </li>
          );
        })}
      </ul>
    </section>
  );
}