01Next button that stays locked until the rules are met

<main class="stage">
  <section class="lg is-demo" id="lg" aria-label="Required checks for signup">
    <p class="lg__h">Step 2 · Required checks</p>
    <ul class="lg__list">
      <li class="lg__row" data-row="1">
        <button class="lg__box" type="button" role="checkbox" aria-checked="false">
          <span class="lg__tick" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" opacity=".2"/><path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32"/></g></svg></span>
          <span class="lg__label">Accept the terms of service</span>
        </button>
      </li>
      <li class="lg__row" data-row="2">
        <button class="lg__box" type="button" role="checkbox" aria-checked="false">
          <span class="lg__tick" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" opacity=".2"/><path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32"/></g></svg></span>
          <span class="lg__label">Accept the privacy notice</span>
        </button>
      </li>
      <li class="lg__row" data-row="3">
        <button class="lg__box" type="button" role="checkbox" aria-checked="false">
          <span class="lg__tick" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" opacity=".2"/><path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32"/></g></svg></span>
          <span class="lg__label">I am 14 or older</span>
        </button>
      </li>
    </ul>
    <div class="lg__foot">
      <p class="lg__why">
        <span class="lg__why-a">Required items are still open</span>
        <span class="lg__why-b">You can move to the next step</span>
      </p>
      <button class="lg__next" type="button" id="lg-next" aria-disabled="true">
        <span class="lg__lock" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M216 96v112a8 8 0 0 1-8 8H48a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2"/><path d="M208 80h-32V56a48 48 0 0 0-96 0v24H48a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V96a16 16 0 0 0-16-16M96 56a32 32 0 0 1 64 0v24H96Zm112 152H48V96h160z"/></g></svg></span>
        <span class="lg__next-t">Next</span>
      </button>
    </div>
  </section>
</main>

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

$duration: $dur-quick;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

$line: color.mix($subject-cream, $stage-ink, 16%);
$soft: color.mix($subject-cream, $stage-ink, 8%);

.lg {
  box-sizing: border-box;
  width: min(304px, 92vw);
  padding: $sp-3;
  border: 1px solid $line;
  border-radius: $r-card;
  background: $stage-ink;
  color: $subject-cream;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.3;
}

.lg__h {
  margin: 0 0 $sp-2;
  color: rgba(255, 255, 255, .56);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
}

.lg__list {
  display: grid;
  gap: $sp-1;
  margin: 0;
  padding: 0;
  list-style: none;
}

// ── 조건 한 줄 ────────────────────────────────────
.lg__box {
  display: flex;
  align-items: center;
  gap: $sp-2;
  width: 100%;
  margin: 0;
  padding: $sp-1 $sp-2;
  border: 1px solid $line;
  border-radius: $r-sm;
  background: $soft;
  color: inherit;
  font-family: inherit;
  font-size: 12px;
  line-height: 1.3;
  text-align: left;
  cursor: pointer;
}
.lg__box:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

.lg__tick {
  display: inline-flex;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  border-radius: $r-xs;
  background: rgba(255, 255, 255, .1);
  color: transparent;
}
.lg__label { color: rgba(255, 255, 255, .74); }

// 정적(사람이 조작하는) 경로 — .is-demo 를 떼도 결과가 보여야 한다
.lg__row.is-on .lg__tick { background: $color; color: $subject-cream; }
.lg__row.is-on .lg__label { color: $subject-cream; }

// ── 발판 ─────────────────────────────────────────
.lg__foot {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: $sp-2;
  margin-top: $sp-2;
}
.lg__why {
  position: relative;
  margin: 0;
  min-height: 16px;
  font-size: 11px;
}
.lg__why-a, .lg__why-b { position: absolute; inset: 0; }
.lg__why-a { color: rgba(255, 255, 255, .5); }
.lg__why-b { color: $subject-mint; opacity: 0; }
.lg.is-ready .lg__why-a { opacity: 0; }
.lg.is-ready .lg__why-b { opacity: 1; }

.lg__next {
  display: inline-flex;
  align-items: center;
  gap: $sp-1;
  margin: 0;
  padding: $sp-1 $sp-3;
  border: 0;
  border-radius: $r-pill;
  background: rgba(255, 255, 255, .12);
  color: rgba(255, 255, 255, .72);
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.6;
  cursor: not-allowed;
}
.lg__next:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.lg__lock { display: inline-flex; width: 13px; height: 13px; }
.lg.is-ready .lg__next { background: $color; color: $subject-cream; cursor: pointer; }
.lg.is-ready .lg__lock { display: none; }
.lg.is-sent .lg__next-t { color: $subject-mint; }
.lg.is-nudge .lg__why-a { color: $error-soft; }

// ── 격자 미리보기 전용 2초 루프 ─────────────────────
// 켜짐은 steps(1, end) 로 한 프레임에 자르고(반투명 유령 금지),
// 프레임 수는 같은 줄의 translateY 팝이 채운다
@keyframes lg-on-1 {
  0%, 11% { background: rgba(255, 255, 255, .1); color: transparent; }
  12%, 100% { background: $color; color: $subject-cream; }
}
@keyframes lg-on-2 {
  0%, 31% { background: rgba(255, 255, 255, .1); color: transparent; }
  32%, 100% { background: $color; color: $subject-cream; }
}
@keyframes lg-on-3 {
  0%, 51% { background: rgba(255, 255, 255, .1); color: transparent; }
  52%, 88% { background: $color; color: $subject-cream; }
  89%, 100% { background: rgba(255, 255, 255, .1); color: transparent; }
}
@keyframes lg-pop-1 {
  0%, 8% { transform: translateY(0); }
  14% { transform: translateY(-3px); }
  22%, 100% { transform: translateY(0); }
}
@keyframes lg-pop-2 {
  0%, 28% { transform: translateY(0); }
  34% { transform: translateY(-3px); }
  42%, 100% { transform: translateY(0); }
}
@keyframes lg-pop-3 {
  0%, 48% { transform: translateY(0); }
  54% { transform: translateY(-3px); }
  62%, 88% { transform: translateY(0); }
  100% { transform: translateY(0); }
}
@keyframes lg-unlock {
  0%, 55% { background: rgba(255, 255, 255, .12); color: rgba(255, 255, 255, .72); }
  56%, 88% { background: $color; color: $subject-cream; }
  89%, 100% { background: rgba(255, 255, 255, .12); color: rgba(255, 255, 255, .72); }
}
@keyframes lg-lock-off {
  0%, 55% { transform: scale(1); opacity: 1; }
  56%, 88% { transform: scale(.4); opacity: 0; }
  89%, 100% { transform: scale(1); opacity: 1; }
}
@keyframes lg-why-a {
  0%, 55% { opacity: 1; }
  56%, 88% { opacity: 0; }
  89%, 100% { opacity: 1; }
}
@keyframes lg-why-b {
  0%, 55% { opacity: 0; transform: translateY(3px); }
  56% { opacity: 1; transform: translateY(3px); }
  64%, 88% { opacity: 1; transform: translateY(0); }
  89%, 100% { opacity: 0; transform: translateY(3px); }
}

.lg.is-demo {
  .lg__row[data-row="1"] .lg__tick { animation-name: lg-on-1; }
  .lg__row[data-row="2"] .lg__tick { animation-name: lg-on-2; }
  .lg__row[data-row="3"] .lg__tick { animation-name: lg-on-3; }
  .lg__tick {
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .lg__row[data-row="1"] .lg__box { animation-name: lg-pop-1; }
  .lg__row[data-row="2"] .lg__box { animation-name: lg-pop-2; }
  .lg__row[data-row="3"] .lg__box { animation-name: lg-pop-3; }
  .lg__box {
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .lg__next {
    animation-name: lg-unlock;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .lg__lock {
    animation-name: lg-lock-off;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .lg__why-a {
    animation-name: lg-why-a;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .lg__why-b {
    animation-name: lg-why-b;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
}

@media (max-width: 340px) {
  .lg { padding: $sp-2; font-size: 11px; }
  .lg__h { margin-bottom: $sp-1; }
  .lg__box { padding: 0 $sp-2; font-size: 11px; }
  .lg__foot { margin-top: $sp-1; }
}

@media (prefers-reduced-motion: reduce) {
  .lg.is-demo .lg__tick,
  .lg.is-demo .lg__box,
  .lg.is-demo .lg__next,
  .lg.is-demo .lg__lock,
  .lg.is-demo .lg__why-a,
  .lg.is-demo .lg__why-b { animation: none !important; transform: none !important; }
  // 움직임만 끄고 판정 결과는 남긴다
  .lg.is-demo .lg__tick { background: $color !important; color: $subject-cream !important; }
  .lg.is-demo .lg__next { background: $color !important; color: $subject-cream !important; }
  .lg.is-demo .lg__lock { display: none !important; }
  .lg.is-demo .lg__why-a { opacity: 0 !important; }
  .lg.is-demo .lg__why-b { opacity: 1 !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.lg {
  box-sizing: border-box;
  width: min(304px, 92vw);
  padding: 12px;
  border: 1px solid rgb(23.5764705882%, 22.0862745098%, 22.9960784314%);
  border-radius: 16px;
  background: #17141a;
  color: #fff7e6;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.3;
}

.lg__h {
  margin: 0 0 8px;
  color: rgba(255, 255, 255, 0.56);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.lg__list {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lg__box {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  margin: 0;
  padding: 4px 8px;
  border: 1px solid rgb(23.5764705882%, 22.0862745098%, 22.9960784314%);
  border-radius: 8px;
  background: rgb(16.2980392157%, 14.9647058824%, 16.5960784314%);
  color: inherit;
  font-family: inherit;
  font-size: 12px;
  line-height: 1.3;
  text-align: left;
  cursor: pointer;
}

.lg__box:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.lg__tick {
  display: inline-flex;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.1);
  color: transparent;
}

.lg__label {
  color: rgba(255, 255, 255, 0.74);
}

.lg__row.is-on .lg__tick {
  background: #2f6df6;
  color: #fff7e6;
}

.lg__row.is-on .lg__label {
  color: #fff7e6;
}

.lg__foot {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
}

.lg__why {
  position: relative;
  margin: 0;
  min-height: 16px;
  font-size: 11px;
}

.lg__why-a, .lg__why-b {
  position: absolute;
  inset: 0;
}

.lg__why-a {
  color: rgba(255, 255, 255, 0.5);
}

.lg__why-b {
  color: #4cd4a6;
  opacity: 0;
}

.lg.is-ready .lg__why-a {
  opacity: 0;
}

.lg.is-ready .lg__why-b {
  opacity: 1;
}

.lg__next {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 4px 12px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.72);
  font-family: inherit;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.6;
  cursor: not-allowed;
}

.lg__next:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.lg__lock {
  display: inline-flex;
  width: 13px;
  height: 13px;
}

.lg.is-ready .lg__next {
  background: #2f6df6;
  color: #fff7e6;
  cursor: pointer;
}

.lg.is-ready .lg__lock {
  display: none;
}

.lg.is-sent .lg__next-t {
  color: #4cd4a6;
}

.lg.is-nudge .lg__why-a {
  color: #ffe0d8;
}

@keyframes lg-on-1 {
  0%, 11% {
    background: rgba(255, 255, 255, 0.1);
    color: transparent;
  }
  12%, 100% {
    background: #2f6df6;
    color: #fff7e6;
  }
}
@keyframes lg-on-2 {
  0%, 31% {
    background: rgba(255, 255, 255, 0.1);
    color: transparent;
  }
  32%, 100% {
    background: #2f6df6;
    color: #fff7e6;
  }
}
@keyframes lg-on-3 {
  0%, 51% {
    background: rgba(255, 255, 255, 0.1);
    color: transparent;
  }
  52%, 88% {
    background: #2f6df6;
    color: #fff7e6;
  }
  89%, 100% {
    background: rgba(255, 255, 255, 0.1);
    color: transparent;
  }
}
@keyframes lg-pop-1 {
  0%, 8% {
    transform: translateY(0);
  }
  14% {
    transform: translateY(-3px);
  }
  22%, 100% {
    transform: translateY(0);
  }
}
@keyframes lg-pop-2 {
  0%, 28% {
    transform: translateY(0);
  }
  34% {
    transform: translateY(-3px);
  }
  42%, 100% {
    transform: translateY(0);
  }
}
@keyframes lg-pop-3 {
  0%, 48% {
    transform: translateY(0);
  }
  54% {
    transform: translateY(-3px);
  }
  62%, 88% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(0);
  }
}
@keyframes lg-unlock {
  0%, 55% {
    background: rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.72);
  }
  56%, 88% {
    background: #2f6df6;
    color: #fff7e6;
  }
  89%, 100% {
    background: rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.72);
  }
}
@keyframes lg-lock-off {
  0%, 55% {
    transform: scale(1);
    opacity: 1;
  }
  56%, 88% {
    transform: scale(0.4);
    opacity: 0;
  }
  89%, 100% {
    transform: scale(1);
    opacity: 1;
  }
}
@keyframes lg-why-a {
  0%, 55% {
    opacity: 1;
  }
  56%, 88% {
    opacity: 0;
  }
  89%, 100% {
    opacity: 1;
  }
}
@keyframes lg-why-b {
  0%, 55% {
    opacity: 0;
    transform: translateY(3px);
  }
  56% {
    opacity: 1;
    transform: translateY(3px);
  }
  64%, 88% {
    opacity: 1;
    transform: translateY(0);
  }
  89%, 100% {
    opacity: 0;
    transform: translateY(3px);
  }
}
.lg.is-demo .lg__row[data-row="1"] .lg__tick {
  animation-name: lg-on-1;
}
.lg.is-demo .lg__row[data-row="2"] .lg__tick {
  animation-name: lg-on-2;
}
.lg.is-demo .lg__row[data-row="3"] .lg__tick {
  animation-name: lg-on-3;
}
.lg.is-demo .lg__tick {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.lg.is-demo .lg__row[data-row="1"] .lg__box {
  animation-name: lg-pop-1;
}
.lg.is-demo .lg__row[data-row="2"] .lg__box {
  animation-name: lg-pop-2;
}
.lg.is-demo .lg__row[data-row="3"] .lg__box {
  animation-name: lg-pop-3;
}
.lg.is-demo .lg__box {
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.lg.is-demo .lg__next {
  animation-name: lg-unlock;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.lg.is-demo .lg__lock {
  animation-name: lg-lock-off;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.lg.is-demo .lg__why-a {
  animation-name: lg-why-a;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.lg.is-demo .lg__why-b {
  animation-name: lg-why-b;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@media (max-width: 340px) {
  .lg {
    padding: 8px;
    font-size: 11px;
  }
  .lg__h {
    margin-bottom: 4px;
  }
  .lg__box {
    padding: 0 8px;
    font-size: 11px;
  }
  .lg__foot {
    margin-top: 4px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .lg.is-demo .lg__tick,
  .lg.is-demo .lg__box,
  .lg.is-demo .lg__next,
  .lg.is-demo .lg__lock,
  .lg.is-demo .lg__why-a,
  .lg.is-demo .lg__why-b {
    animation: none !important;
    transform: none !important;
  }
  .lg.is-demo .lg__tick {
    background: #2f6df6 !important;
    color: #fff7e6 !important;
  }
  .lg.is-demo .lg__next {
    background: #2f6df6 !important;
    color: #fff7e6 !important;
  }
  .lg.is-demo .lg__lock {
    display: none !important;
  }
  .lg.is-demo .lg__why-a {
    opacity: 0 !important;
  }
  .lg.is-demo .lg__why-b {
    opacity: 1 !important;
  }
}

// 실제 동작: 세 조건이 전부 켜져야 Next 버튼의 aria-disabled 가 false 로 바뀐다.
// 잠긴 동안 눌러도 단계는 안 넘어가고 이유 문구만 그대로 남는다.
var lg = document.getElementById('lg');
var lgBoxes = [].slice.call(lg.querySelectorAll('.lg__box'));
function lgSync() {
  var done = lgBoxes.filter(function (b) { return b.getAttribute('aria-checked') === 'true'; }).length;
  var ready = done === lgBoxes.length;
  lg.classList.toggle('is-ready', ready);
  var next = document.getElementById('lg-next');
  next.setAttribute('aria-disabled', ready ? 'false' : 'true');
}
lgBoxes.forEach(function (b) {
  b.addEventListener('click', function () {
    lg.classList.remove('is-demo');
    b.setAttribute('aria-checked', b.getAttribute('aria-checked') === 'true' ? 'false' : 'true');
    b.parentNode.classList.toggle('is-on', b.getAttribute('aria-checked') === 'true');
    lgSync();
  });
});
document.getElementById('lg-next').addEventListener('click', function () {
  lg.classList.remove('is-demo');
  if (this.getAttribute('aria-disabled') === 'true') { lg.classList.add('is-nudge'); return; }
  lg.classList.remove('is-nudge');
  lg.classList.add('is-sent');
});
lgSync();

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

export type StepLockGateProps = {
  heading?: string;
  rules?: string[];
  lockedHint?: string;
  readyHint?: string;
  nextLabel?: 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 };

const DEFAULT_RULES = ["Accept the terms of service", "Accept the privacy notice", "I am 14 or older"];

function Tick() {
  return (
    <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor">
      <g>
        <path d="M232 56v144a16 16 0 0 1-16 16H40a16 16 0 0 1-16-16V56a16 16 0 0 1 16-16h176a16 16 0 0 1 16 16" opacity=".2" />
        <path d="m205.66 85.66l-96 96a8 8 0 0 1-11.32 0l-40-40a8 8 0 0 1 11.32-11.32L104 164.69l90.34-90.35a8 8 0 0 1 11.32 11.32" />
      </g>
    </svg>
  );
}

function Lock() {
  return (
    <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor">
      <g>
        <path d="M216 96v112a8 8 0 0 1-8 8H48a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2" />
        <path d="M208 80h-32V56a48 48 0 0 0-96 0v24H48a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V96a16 16 0 0 0-16-16M96 56a32 32 0 0 1 64 0v24H96Zm112 152H48V96h160z" />
      </g>
    </svg>
  );
}

export default function StepLockGate({
  heading = "Step 2 · Required checks",
  rules = DEFAULT_RULES,
  lockedHint = "Required items are still open",
  readyHint = "You can move to the next step",
  nextLabel = "Next",
  groupLabel = "Required checks for signup",
  demo = true,
  duration = 220,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: StepLockGateProps) {
  const [on, setOn] = useState<boolean[]>(rules.map(() => false));
  const [live, setLive] = useState(demo);
  const [nudge, setNudge] = useState(false);

  const ready = on.length > 0 && on.every(Boolean);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function toggle(i: number) {
    setLive(false);
    setOn((prev) => prev.map((v, n) => (n === i ? !v : v)));
  }

  function next() {
    setLive(false);
    // 잠긴 동안 눌러도 단계는 안 넘어간다 — 이유만 강조한다
    setNudge(!ready);
  }

  const cls = [styles.lg, live ? styles.isDemo : "", ready ? styles.isReady : "", nudge ? styles.isNudge : ""]
    .filter(Boolean)
    .join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <p className={styles.h}>{heading}</p>
      <ul className={styles.list}>
        {rules.map((r, i) => (
          <li key={r} className={[styles.row, on[i] ? styles.isOn : ""].filter(Boolean).join(" ")} data-row={i + 1}>
            <button className={styles.box} type="button" role="checkbox" aria-checked={on[i]} onClick={() => toggle(i)}>
              <span className={styles.tick} aria-hidden="true"><Tick /></span>
              <span className={styles.label}>{r}</span>
            </button>
          </li>
        ))}
      </ul>
      <div className={styles.foot}>
        <p className={styles.why}>
          <span className={styles.whyA}>{lockedHint}</span>
          <span className={styles.whyB}>{readyHint}</span>
        </p>
        <button className={styles.next} type="button" aria-disabled={!ready} onClick={next}>
          {!ready && <span className={styles.lock} aria-hidden="true"><Lock /></span>}
          <span className={styles.nextT}>{nextLabel}</span>
        </button>
      </div>
    </section>
  );
}