02サブが右に滑る多段ドロップダウン

<main class="stage">
  <div class="mls is-demo" id="root">
    <button class="mls__trigger" id="trigger" type="button" aria-controls="l1">ライブラリ
      <svg class="mls__caret" viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="m208 96l-80 80l-80-80Z" opacity=".2"/><path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z"/></g></svg>
    </button>
    <nav class="mls__l1" id="l1" aria-label="ライブラリメニュー">
      <ul class="mls__u">
        <li class="mls__i"><a class="mls__a" href="#">はじめる</a></li>
        <li class="mls__i mls__i--parent mls__i--feat">
          <button class="mls__b" type="button" aria-controls="l2">機能
            <svg class="mls__sub-caret" viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="m176 128l-80 80V48Z" opacity=".2"/><path d="m181.66 122.34l-80-80A8 8 0 0 0 88 48v160a8 8 0 0 0 13.66 5.66l80-80a8 8 0 0 0 0-11.32M104 188.69V67.31L164.69 128Z"/></g></svg>
          </button>
          <ul class="mls__l2" id="l2">
            <li class="mls__i"><a class="mls__a" href="#">リストを作る</a></li>
            <li class="mls__i mls__i--parent mls__i--share">
              <button class="mls__b" type="button" aria-controls="l3">共有
                <svg class="mls__sub-caret" viewBox="0 0 256 256" width="16" height="16" aria-hidden="true"><g fill="currentColor"><path d="m176 128l-80 80V48Z" opacity=".2"/><path d="m181.66 122.34l-80-80A8 8 0 0 0 88 48v160a8 8 0 0 0 13.66 5.66l80-80a8 8 0 0 0 0-11.32M104 188.69V67.31L164.69 128Z"/></g></svg>
              </button>
              <ul class="mls__l3" id="l3">
                <li class="mls__i"><a class="mls__a" href="#">リンクをコピー</a></li>
                <li class="mls__i"><a class="mls__a" href="#">コードを埋め込む</a></li>
              </ul>
            </li>
            <li class="mls__i"><a class="mls__a" href="#">インポート</a></li>
          </ul>
        </li>
        <li class="mls__i"><a class="mls__a" href="#">料金</a></li>
        <li class="mls__i"><a class="mls__a" href="#">お問い合わせ</a></li>
      </ul>
    </nav>
  </div>
</main>

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

$duration: $dur-loop;
$easing: $ease-spring;
$color: $stage-yellow;

@include stage($stage-ink);

// 플라이아웃은 왼쪽에서 폭을 쓴다 — 무대 중앙 정렬 대신 상단 왼쪽 고정
.stage { align-items: flex-start; justify-items: start; }

$ink-70: rgba(23, 20, 26, .72);

.mls {
  position: relative;
}

.mls__trigger {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: $sp-2;
  height: 36px;
  padding: 0 $sp-3;
  border: 0;
  border-radius: $r-control;
  background: $subject-cream;
  box-shadow: $shadow-press;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 13px;
  font-weight: 700;
  line-height: 18px;
  color: $subject-ink;
  cursor: pointer;
}
.mls__trigger:focus-visible { outline: 2px solid $color; outline-offset: -2px; }
// 실제 조작에서도 열려 있는 동안 트리거가 눌려 있음을 배경으로 보여 준다
.mls:not(.is-demo) .mls__trigger[aria-expanded="true"] { background-color: rgba(255, 210, 63, .45); }
.mls__caret { display: block; transition: transform $dur-quick $ease-spring; }
.mls__trigger[aria-expanded="true"] .mls__caret { transform: rotate(180deg); }

.mls__l1,
.mls__l2,
.mls__l3 {
  position: absolute;
  z-index: 2;
  box-sizing: border-box;
  margin: 0;
  padding: $sp-1 0;
  list-style: none;
  background: $subject-cream;
  border-radius: $r-card;
  box-shadow: $shadow-raised;
}
.mls__u {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mls__l1 {
  top: 42px;
  left: 0;
  width: min(160px, 50vw);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity $dur-quick $easing, transform $dur-quick $easing, visibility 0s linear $dur-quick;
}
.mls:not(.is-demo).is-open .mls__l1 {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity $dur-quick $easing, transform $dur-quick $easing, visibility 0s;
}

// 하위 단계는 각 항목(li) 기준 오른쪽 옆 — hover/:focus-within CSS 로 열린다
.mls__l2,
.mls__l3 {
  top: 0;
  left: 100%;
  opacity: 0;
  visibility: hidden;
  transform: translateX(12px);
  transition: opacity $dur-quick $easing, transform $dur-quick $easing, visibility 0s linear $dur-quick;
}
.mls__l2 { width: min(140px, 44vw); }
.mls__l3 { width: min(120px, 38vw); }

.mls__i { position: relative; }
.mls__i--parent:hover > .mls__l2,
.mls__i--parent:focus-within > .mls__l2,
.mls__i--parent:hover > .mls__l3,
.mls__i--parent:focus-within > .mls__l3 {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  transition: opacity $dur-quick $easing, transform $dur-quick $easing, visibility 0s;
}

.mls__a,
.mls__b {
  box-sizing: border-box;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: $sp-1;
  height: 30px;
  padding: 0 $sp-3;
  border: 0;
  background: transparent;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  font-weight: 400;
  line-height: 16px;
  color: $ink-70;
  text-decoration: none;
  cursor: pointer;
}
.mls__a:hover,
.mls__b:hover { background: rgba(255, 210, 63, .3); color: $subject-ink; }
.mls__a:focus-visible,
.mls__b:focus-visible { outline: 2px solid $color; outline-offset: -2px; }
.mls__b { font-weight: 700; color: $subject-ink; }
.mls__sub-caret { display: block; transition: transform $dur-quick $ease-spring; }
.mls__i--parent:hover > .mls__b .mls__sub-caret,
.mls__i--parent:focus-within > .mls__b .mls__sub-caret { transform: rotate(90deg); }

// ── 자동 루프 (2s) ────────────────────────────────────
// 6% L1 컷 등장 → 30% L2 슬라이드 → 52% L3 슬라이드 → 76·82·88.5% 에 나눠 순차 닫힘(L3→L2→L1)
// 슬라이드는 transform 을 $easing 으로, 보임은 steps(1, end) 컷으로 나눠 건다
.mls.is-demo .mls__l1,
.mls.is-demo .mls__l2,
.mls.is-demo .mls__l3 { visibility: visible; }

.mls.is-demo .mls__l1 {
  animation-name: mls-l1;
  animation-duration: $duration;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.mls.is-demo .mls__caret {
  animation-name: mls-caret;
  animation-duration: $duration;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.mls.is-demo .mls__trigger {
  animation-name: mls-trig;
  animation-duration: $duration;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.mls.is-demo .mls__l2 {
  animation-name: mls-l2-slide, mls-l2-show;
  animation-duration: $duration, $duration;
  animation-timing-function: $easing, steps(1, end);
  animation-iteration-count: infinite, infinite;
  animation-fill-mode: backwards, backwards;
}
.mls.is-demo .mls__l3 {
  animation-name: mls-l3-slide, mls-l3-show;
  animation-duration: $duration, $duration;
  animation-timing-function: $easing, steps(1, end);
  animation-iteration-count: infinite, infinite;
  animation-fill-mode: backwards, backwards;
}
.mls.is-demo .mls__i--feat > .mls__b .mls__sub-caret {
  animation-name: mls-caret-feat;
  animation-duration: $duration;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.mls.is-demo .mls__i--share > .mls__b .mls__sub-caret {
  animation-name: mls-caret-share;
  animation-duration: $duration;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes mls-l1 {
  0%, 5%    { opacity: 0; transform: translateY(-6px); clip-path: inset(0 0 100% 0); }
  6%, 82%   { opacity: 1; transform: translateY(0); clip-path: inset(0 0 0 0); }
  90%, 100% { opacity: 1; transform: translateY(0); clip-path: inset(100% 0 0 0); }
}
@keyframes mls-caret {
  0%, 5%    { transform: rotate(0deg); }
  6%, 88%   { transform: rotate(180deg); }
  88.5%, 100% { transform: rotate(0deg); }
}
@keyframes mls-l2-slide {
  0%, 28%   { transform: translateX(12px); }
  36%, 80%  { transform: translateX(0); }
  86%, 100% { transform: translateX(12px); }
}
@keyframes mls-l2-show {
  0%, 29%   { opacity: 0; }
  31%, 82%  { opacity: 1; }
  82.1%, 100% { opacity: 0; }
}
@keyframes mls-caret-feat {
  0%, 30%   { transform: rotate(0deg); }
  31%, 82%  { transform: rotate(90deg); }
  83%, 100% { transform: rotate(0deg); }
}
@keyframes mls-l3-slide {
  0%, 50%    { transform: translateX(12px); }
  58%, 77%   { transform: translateX(0); }
  83%, 100%  { transform: translateX(12px); }
}
@keyframes mls-l3-show {
  0%, 51%    { opacity: 0; }
  53%, 76%   { opacity: 1; }
  76.1%, 100% { opacity: 0; }
}
@keyframes mls-caret-share {
  0%, 52%    { transform: rotate(0deg); }
  53%, 76%   { transform: rotate(90deg); }
  77%, 100%  { transform: rotate(0deg); }
}

// 트리거 배경도 열림 컷과 같은 순간에 갈린다 — 열림 순간의 변화량을 닫힘보다 크게
@keyframes mls-trig {
  0%, 5.9%    { background-color: transparent; }
  6%, 88%     { background-color: rgba(255, 210, 63, .45); }
  88.5%, 100% { background-color: transparent; }
}

// 루프 동안 L1 목록을 훑는 하이라이트 띠 — 열려 있는 긴 유지 구간의 프레임을 채운다.
// 배경색 스윕은 강도가 0으로 측정되는 함정(134 실측)이 있어 띠가 실제 translateY 로 움직인다
.mls.is-demo .mls__l1::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: $sp-1;
  height: 30px;
  border-radius: $r-sm;
  background: rgba(255, 210, 63, .3);
  pointer-events: none;
  animation-name: mls-sweep;
  animation-duration: 900ms;
  animation-timing-function: $ease-out;
  animation-iteration-count: infinite;
}
@keyframes mls-sweep {
  0%   { transform: translateY(0); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { transform: translateY(90px); opacity: 0; }
}

// 320px 폰 — L1+L2+L3 가 옆으로 나가지 않게 폭을 줄인다.
// 슬라이드 중엔 부모 transform(+12px) 이 abs 자식에 겹쳐 최대 +24px 까지 나가므로
// 12.8 + 108+92+80 + 24 = 316.8 ≤ 320 이 되게 폭을 잡는다
@media (max-width: 340px) {
  .mls__trigger { height: 30px; padding: 0 $sp-2; font-size: 11px; line-height: 15px; }
  .mls__l1 { top: 34px; width: 108px; }
  .mls__l2 { width: 92px; }
  .mls__l3 { width: 80px; }
  .mls__a,
  .mls__b { height: 26px; padding: 0 $sp-1; gap: 0; font-size: 10px; line-height: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .mls.is-demo .mls__l1,
  .mls.is-demo .mls__l2,
  .mls.is-demo .mls__l3,
  .mls.is-demo .mls__caret,
  .mls.is-demo .mls__sub-caret { animation: none !important; }
  .mls.is-demo .mls__l1::after { animation: none !important; opacity: 0; }
  .mls.is-demo .mls__l1,
  .mls.is-demo .mls__l2,
  .mls.is-demo .mls__l3 { opacity: 1; visibility: visible; transform: none; }
  .mls.is-demo .mls__caret { transform: rotate(180deg); }
  .mls.is-demo .mls__trigger { background-color: rgba(255, 210, 63, .45); }
  .mls.is-demo .mls__i--feat > .mls__b .mls__sub-caret,
  .mls.is-demo .mls__i--share > .mls__b .mls__sub-caret { transform: rotate(90deg); }
}

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);
}

.stage {
  align-items: flex-start;
  justify-items: start;
}

.mls {
  position: relative;
}

.mls__trigger {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 12px;
  background: #fff7e6;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 13px;
  font-weight: 700;
  line-height: 18px;
  color: #17141a;
  cursor: pointer;
}

.mls__trigger:focus-visible {
  outline: 2px solid #ffd23f;
  outline-offset: -2px;
}

.mls:not(.is-demo) .mls__trigger[aria-expanded=true] {
  background-color: rgba(255, 210, 63, 0.45);
}

.mls__caret {
  display: block;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mls__trigger[aria-expanded=true] .mls__caret {
  transform: rotate(180deg);
}

.mls__l1,
.mls__l2,
.mls__l3 {
  position: absolute;
  z-index: 2;
  box-sizing: border-box;
  margin: 0;
  padding: 4px 0;
  list-style: none;
  background: #fff7e6;
  border-radius: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.mls__u {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mls__l1 {
  top: 42px;
  left: 0;
  width: min(160px, 50vw);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s linear 220ms;
}

.mls:not(.is-demo).is-open .mls__l1 {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s;
}

.mls__l2,
.mls__l3 {
  top: 0;
  left: 100%;
  opacity: 0;
  visibility: hidden;
  transform: translateX(12px);
  transition: opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s linear 220ms;
}

.mls__l2 {
  width: min(140px, 44vw);
}

.mls__l3 {
  width: min(120px, 38vw);
}

.mls__i {
  position: relative;
}

.mls__i--parent:hover > .mls__l2,
.mls__i--parent:focus-within > .mls__l2,
.mls__i--parent:hover > .mls__l3,
.mls__i--parent:focus-within > .mls__l3 {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  transition: opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s;
}

.mls__a,
.mls__b {
  box-sizing: border-box;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
  height: 30px;
  padding: 0 12px;
  border: 0;
  background: transparent;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  font-weight: 400;
  line-height: 16px;
  color: rgba(23, 20, 26, 0.72);
  text-decoration: none;
  cursor: pointer;
}

.mls__a:hover,
.mls__b:hover {
  background: rgba(255, 210, 63, 0.3);
  color: #17141a;
}

.mls__a:focus-visible,
.mls__b:focus-visible {
  outline: 2px solid #ffd23f;
  outline-offset: -2px;
}

.mls__b {
  font-weight: 700;
  color: #17141a;
}

.mls__sub-caret {
  display: block;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mls__i--parent:hover > .mls__b .mls__sub-caret,
.mls__i--parent:focus-within > .mls__b .mls__sub-caret {
  transform: rotate(90deg);
}

.mls.is-demo .mls__l1,
.mls.is-demo .mls__l2,
.mls.is-demo .mls__l3 {
  visibility: visible;
}

.mls.is-demo .mls__l1 {
  animation-name: mls-l1;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.mls.is-demo .mls__caret {
  animation-name: mls-caret;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.mls.is-demo .mls__trigger {
  animation-name: mls-trig;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.mls.is-demo .mls__l2 {
  animation-name: mls-l2-slide, mls-l2-show;
  animation-duration: 2s, 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1), steps(1, end);
  animation-iteration-count: infinite, infinite;
  animation-fill-mode: backwards, backwards;
}

.mls.is-demo .mls__l3 {
  animation-name: mls-l3-slide, mls-l3-show;
  animation-duration: 2s, 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1), steps(1, end);
  animation-iteration-count: infinite, infinite;
  animation-fill-mode: backwards, backwards;
}

.mls.is-demo .mls__i--feat > .mls__b .mls__sub-caret {
  animation-name: mls-caret-feat;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.mls.is-demo .mls__i--share > .mls__b .mls__sub-caret {
  animation-name: mls-caret-share;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes mls-l1 {
  0%, 5% {
    opacity: 0;
    transform: translateY(-6px);
    clip-path: inset(0 0 100% 0);
  }
  6%, 82% {
    opacity: 1;
    transform: translateY(0);
    clip-path: inset(0 0 0 0);
  }
  90%, 100% {
    opacity: 1;
    transform: translateY(0);
    clip-path: inset(100% 0 0 0);
  }
}
@keyframes mls-caret {
  0%, 5% {
    transform: rotate(0deg);
  }
  6%, 88% {
    transform: rotate(180deg);
  }
  88.5%, 100% {
    transform: rotate(0deg);
  }
}
@keyframes mls-l2-slide {
  0%, 28% {
    transform: translateX(12px);
  }
  36%, 80% {
    transform: translateX(0);
  }
  86%, 100% {
    transform: translateX(12px);
  }
}
@keyframes mls-l2-show {
  0%, 29% {
    opacity: 0;
  }
  31%, 82% {
    opacity: 1;
  }
  82.1%, 100% {
    opacity: 0;
  }
}
@keyframes mls-caret-feat {
  0%, 30% {
    transform: rotate(0deg);
  }
  31%, 82% {
    transform: rotate(90deg);
  }
  83%, 100% {
    transform: rotate(0deg);
  }
}
@keyframes mls-l3-slide {
  0%, 50% {
    transform: translateX(12px);
  }
  58%, 77% {
    transform: translateX(0);
  }
  83%, 100% {
    transform: translateX(12px);
  }
}
@keyframes mls-l3-show {
  0%, 51% {
    opacity: 0;
  }
  53%, 76% {
    opacity: 1;
  }
  76.1%, 100% {
    opacity: 0;
  }
}
@keyframes mls-caret-share {
  0%, 52% {
    transform: rotate(0deg);
  }
  53%, 76% {
    transform: rotate(90deg);
  }
  77%, 100% {
    transform: rotate(0deg);
  }
}
@keyframes mls-trig {
  0%, 5.9% {
    background-color: transparent;
  }
  6%, 88% {
    background-color: rgba(255, 210, 63, 0.45);
  }
  88.5%, 100% {
    background-color: transparent;
  }
}
.mls.is-demo .mls__l1::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 4px;
  height: 30px;
  border-radius: 8px;
  background: rgba(255, 210, 63, 0.3);
  pointer-events: none;
  animation-name: mls-sweep;
  animation-duration: 900ms;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

@keyframes mls-sweep {
  0% {
    transform: translateY(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(90px);
    opacity: 0;
  }
}
@media (max-width: 340px) {
  .mls__trigger {
    height: 30px;
    padding: 0 8px;
    font-size: 11px;
    line-height: 15px;
  }
  .mls__l1 {
    top: 34px;
    width: 108px;
  }
  .mls__l2 {
    width: 92px;
  }
  .mls__l3 {
    width: 80px;
  }
  .mls__a,
  .mls__b {
    height: 26px;
    padding: 0 4px;
    gap: 0;
    font-size: 10px;
    line-height: 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .mls.is-demo .mls__l1,
  .mls.is-demo .mls__l2,
  .mls.is-demo .mls__l3,
  .mls.is-demo .mls__caret,
  .mls.is-demo .mls__sub-caret {
    animation: none !important;
  }
  .mls.is-demo .mls__l1::after {
    animation: none !important;
    opacity: 0;
  }
  .mls.is-demo .mls__l1,
  .mls.is-demo .mls__l2,
  .mls.is-demo .mls__l3 {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .mls.is-demo .mls__caret {
    transform: rotate(180deg);
  }
  .mls.is-demo .mls__trigger {
    background-color: rgba(255, 210, 63, 0.45);
  }
  .mls.is-demo .mls__i--feat > .mls__b .mls__sub-caret,
  .mls.is-demo .mls__i--share > .mls__b .mls__sub-caret {
    transform: rotate(90deg);
  }
}

var root = document.getElementById('root');
var trigger = document.getElementById('trigger');
var parents = Array.prototype.slice.call(root.querySelectorAll('.mls__i--parent'));

trigger.setAttribute('aria-haspopup', 'true');
trigger.setAttribute('aria-expanded', 'false');
parents.forEach(function (li) {
  var btn = li.querySelector('button');
  btn.setAttribute('aria-haspopup', 'true');
  btn.setAttribute('aria-expanded', 'false');
  ['mouseenter', 'focusin'].forEach(function (on) {
    li.addEventListener(on, function () { btn.setAttribute('aria-expanded', 'true'); });
  });
  ['mouseleave', 'focusout'].forEach(function (off) {
    li.addEventListener(off, function () { btn.setAttribute('aria-expanded', 'false'); });
  });
});

function stopDemo() { root.classList.remove('is-demo'); }
function setL1(on) {
  stopDemo();
  root.classList.toggle('is-open', on);
  trigger.setAttribute('aria-expanded', String(on));
}
function closeAll() {
  setL1(false);
  parents.forEach(function (li) { li.querySelector('button').setAttribute('aria-expanded', 'false'); });
}
trigger.addEventListener('click', function () { setL1(!root.classList.contains('is-open')); });
trigger.addEventListener('focus', function () { setL1(true); });
document.addEventListener('keydown', function (e) { if (e.key === 'Escape') closeAll(); });
document.addEventListener('pointerdown', function (e) { if (!root.contains(e.target)) closeAll(); });
document.addEventListener('pointerdown', stopDemo, { once: true });
document.addEventListener('keydown', stopDemo, { once: true });

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

export type MultilevelSlideLabels = {
  menuLabel: string;
  trigger: string;
  start: string;
  features: string;
  pricing: string;
  contact: string;
  makeList: string;
  share: string;
  importItems: string;
  copyLink: string;
  embed: string;
};

export type MultilevelSlideProps = {
  labels?: MultilevelSlideLabels;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type KeyEvt = { key: string };
type BlurEvt = { relatedTarget: Node | null; currentTarget: Node };

const DEFAULT_LABELS: MultilevelSlideLabels = {
  menuLabel: "Library menu",
  trigger: "Library",
  start: "Get started",
  features: "Features",
  pricing: "Pricing",
  contact: "Contact",
  makeList: "Make a list",
  share: "Share",
  importItems: "Import",
  copyLink: "Copy link",
  embed: "Embed code",
};

function CaretDown() {
  return (
    <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true">
      <g fill="currentColor">
        <path d="m208 96l-80 80l-80-80Z" opacity=".2" />
        <path d="M215.39 92.94A8 8 0 0 0 208 88H48a8 8 0 0 0-5.66 13.66l80 80a8 8 0 0 0 11.32 0l80-80a8 8 0 0 0 1.73-8.72M128 164.69L67.31 104h121.38Z" />
      </g>
    </svg>
  );
}

function CaretRight() {
  return (
    <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true">
      <g fill="currentColor">
        <path d="m176 128l-80 80V48Z" opacity=".2" />
        <path d="m181.66 122.34l-80-80A8 8 0 0 0 88 48v160a8 8 0 0 0 13.66 5.66l80-80a8 8 0 0 0 0-11.32M104 188.69V67.31L164.69 128Z" />
      </g>
    </svg>
  );
}

export default function MultilevelSlide({
  labels = DEFAULT_LABELS,
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#ffd23f",
}: MultilevelSlideProps) {
  const [live, setLive] = useState(true);
  const [l1, setL1] = useState(false);
  const [feat, setFeat] = useState(false);
  const [share, setShare] = useState(false);

  function wake() {
    setLive(false);
  }
  function closeAll() {
    wake();
    setL1(false);
    setFeat(false);
    setShare(false);
  }
  function leftSub(e: BlurEvt) {
    if (!e.currentTarget.contains(e.relatedTarget)) closeAll();
  }

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div
      className={[styles.mls, live ? styles.isDemo : "", l1 ? styles.isOpen : ""].join(" ")}
      style={vars}
      onPointerDownCapture={wake}
      onKeyDownCapture={wake}
      onKeyDown={(e: KeyEvt) => {
        if (e.key === "Escape") closeAll();
      }}
      onBlurCapture={leftSub}
    >
      <button
        type="button"
        className={styles.mlsTrigger}
        aria-expanded={l1}
        aria-haspopup="true"
        onClick={() => {
          wake();
          setL1(!l1);
        }}
        onFocus={() => {
          wake();
          setL1(true);
        }}
      >
        {labels.trigger}
        <span className={styles.mlsCaret}>
          <CaretDown />
        </span>
      </button>
      <nav className={styles.mlsL1} aria-label={labels.menuLabel}>
        <ul className={styles.mlsU}>
          <li className={styles.mlsI}>
            <a className={styles.mlsA} href="#">{labels.start}</a>
          </li>
          <li
            className={[styles.mlsI, styles.mlsParent, styles.iFeat].join(" ")}
            onMouseEnter={() => {
              wake();
              setFeat(true);
            }}
            onMouseLeave={() => setFeat(false)}
            onFocusCapture={() => setFeat(true)}
            onBlurCapture={(e: BlurEvt) => {
              if (!e.currentTarget.contains(e.relatedTarget)) setFeat(false);
            }}
          >
            <button type="button" className={styles.mlsB} aria-expanded={feat} aria-haspopup="true">
              {labels.features}
              <span className={styles.mlsSubCaret}>
                <CaretRight />
              </span>
            </button>
            <ul className={[styles.mlsU, styles.mlsL2].join(" ")}>
              <li className={styles.mlsI}>
                <a className={styles.mlsA} href="#">{labels.makeList}</a>
              </li>
              <li
                className={[styles.mlsI, styles.mlsParent, styles.iShare].join(" ")}
                onMouseEnter={() => {
                  wake();
                  setShare(true);
                }}
                onMouseLeave={() => setShare(false)}
                onFocusCapture={() => setShare(true)}
                onBlurCapture={(e: BlurEvt) => {
                  if (!e.currentTarget.contains(e.relatedTarget)) setShare(false);
                }}
              >
                <button type="button" className={styles.mlsB} aria-expanded={share} aria-haspopup="true">
                  {labels.share}
                  <span className={styles.mlsSubCaret}>
                    <CaretRight />
                  </span>
                </button>
                <ul className={[styles.mlsU, styles.mlsL3].join(" ")}>
                  <li className={styles.mlsI}>
                    <a className={styles.mlsA} href="#">{labels.copyLink}</a>
                  </li>
                  <li className={styles.mlsI}>
                    <a className={styles.mlsA} href="#">{labels.embed}</a>
                  </li>
                </ul>
              </li>
              <li className={styles.mlsI}>
                <a className={styles.mlsA} href="#">{labels.importItems}</a>
              </li>
            </ul>
          </li>
          <li className={styles.mlsI}>
            <a className={styles.mlsA} href="#">{labels.pricing}</a>
          </li>
          <li className={styles.mlsI}>
            <a className={styles.mlsA} href="#">{labels.contact}</a>
          </li>
        </ul>
      </nav>
    </div>
  );
}