04Playback speed menu

<main class="stage">
  <figure class="pl is-demo" id="pl">
    <div class="pl__screen">
      <div class="pl__stripes" aria-hidden="true"></div>
      <div class="pl__world" aria-hidden="true"><span class="pl__sun"></span><span class="pl__hill pl__hill--a"></span><span class="pl__hill pl__hill--b"></span></div>
      <div class="pl__top">
        <span class="pl__clock" id="clock">0:18</span>
        <span class="pl__badge">3:00</span>
      </div>

      <div class="spd">
        <div class="spd__menu" id="menu" role="menu" aria-label="Playback speed">
          <span class="spd__mark" aria-hidden="true"></span>
          <button class="spd__item" type="button" role="menuitemradio" aria-checked="false" data-r="0.5"><span class="spd__lab">0.5x</span><span class="spd__ck" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><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></button>
          <button class="spd__item" type="button" role="menuitemradio" aria-checked="false" data-r="0.75"><span class="spd__lab">0.75x</span><span class="spd__ck" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><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></button>
          <button class="spd__item" type="button" role="menuitemradio" aria-checked="true" data-r="1"><span class="spd__lab">1x</span><span class="spd__ck" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><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></button>
          <button class="spd__item" type="button" role="menuitemradio" aria-checked="false" data-r="1.25"><span class="spd__lab">1.25x</span><span class="spd__ck" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><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></button>
          <button class="spd__item" type="button" role="menuitemradio" aria-checked="false" data-r="1.5"><span class="spd__lab">1.5x</span><span class="spd__ck" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><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></button>
          <button class="spd__item" type="button" role="menuitemradio" aria-checked="false" data-r="2"><span class="spd__lab">2x</span><span class="spd__ck" aria-hidden="true"><svg viewBox="0 0 256 256" width="13" height="13"><g fill="currentColor"><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></button>
        </div>
        <button class="spd__btn" type="button" id="sbtn" aria-haspopup="menu" aria-expanded="false" aria-controls="menu" aria-label="Playback speed">
          <span class="spd__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="16" height="16"><g fill="currentColor"><path d="M232 152v24a8 8 0 0 1-8 8H32a8 8 0 0 1-8-8v-22.87C24 95.65 70.15 48.2 127.63 48A104 104 0 0 1 232 152" opacity=".2"/><path d="M207.06 72.67A111.24 111.24 0 0 0 128 40h-.4C66.07 40.21 16 91 16 153.13V176a16 16 0 0 0 16 16h192a16 16 0 0 0 16-16v-24a111.25 111.25 0 0 0-32.94-79.33M224 176H119.71l54.76-75.3a8 8 0 0 0-12.94-9.42L99.92 176H32v-22.87c0-3.08.15-6.12.43-9.13H56a8 8 0 0 0 0-16H35.27c10.32-38.86 44-68.24 84.73-71.66V80a8 8 0 0 0 16 0V56.33A96.14 96.14 0 0 1 221 128h-21a8 8 0 0 0 0 16h23.67c.21 2.65.33 5.31.33 8Z"/></g></svg></span>
          <span class="spd__valwrap">
            <span class="spd__val" id="val">1x</span>
            <span class="spd__alt spd__alt--fast" aria-hidden="true">1.5x</span>
            <span class="spd__alt spd__alt--slow" aria-hidden="true">0.5x</span>
          </span>
        </button>
      </div>

      <span class="pl__time"><b id="t-now">0:18</b> / 3:00</span>
      <span class="pl__fillwrap" aria-hidden="true"><span class="pl__fill" id="fill"></span></span>
    </div>
  </figure>
</main>

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

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

@include stage($stage-paper);

// 메뉴 한 줄의 높이 — 마커 이동량(=줄 높이 × 번호)과 메뉴 전체 높이가 이 값에서 나온다
$row: 17px;

// ── 플레이어 껍데기 (01 과 같은 뼈대. 흰 무대라 본체는 먹색) ──
.pl {
  position: relative;
  box-sizing: border-box;
  width: min(392px, 92vw);
  margin: 0;
  border-radius: $r-card;
  background: $subject-ink;
  box-shadow: $shadow-raised;
  overflow: hidden;
}
.pl__screen {
  position: relative;
  height: clamp(148px, 34vw, 164px);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(47, 109, 246, .58), rgba(23, 20, 26, .94));
}
.pl__stripes {
  position: absolute;
  inset: 0 -72px;
  background: repeating-linear-gradient(90deg, rgba(255, 247, 230, .16) 0 12px, transparent 12px 32px);
  animation-name: pl-pan;
  animation-duration: $dur-loop;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes pl-pan { from { transform: translateX(0); } to { transform: translateX(-64px); } }
.pl__world { position: absolute; inset: 0; }
.pl__sun {
  position: absolute; right: 22%; top: 16%;
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(255, 210, 63, .95);
  box-shadow: 0 0 0 8px rgba(255, 210, 63, .22);
}
.pl__hill { position: absolute; bottom: -46%; height: 82%; border-radius: 50%; }
.pl__hill--a { left: -14%; width: 72%; background: rgba(255, 247, 230, .14); }
.pl__hill--b { right: -18%; width: 62%; background: rgba(255, 247, 230, .08); }

.pl__top {
  position: absolute; left: $sp-2; top: $sp-2;
  display: flex; align-items: center; gap: $sp-1;
}
.pl__clock, .pl__badge {
  padding: $sp-1 $sp-2;
  border-radius: $r-xs;
  background: rgba(23, 20, 26, .62);
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px; line-height: 14px; font-weight: 700;
}
.pl__clock { color: #fff; }
.pl__badge { color: rgba(255, 255, 255, .82); font-weight: 600; }

.pl__time {
  position: absolute; left: $sp-2; bottom: $sp-2;
  color: #fff;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px; line-height: 14px; font-weight: 600;
  text-shadow: 0 1px 2px rgba(23, 20, 26, .7);
}
.pl__time b { font-weight: 700; }

.pl__fillwrap { position: absolute; left: 0; right: 0; bottom: 0; height: 6px; background: rgba(255, 255, 255, .24); }
.pl__fill {
  display: block; height: 100%;
  background: $color;
  transform-origin: left center; // 규칙8: 좌변서 차오름
  transform: scaleX(.14);
}

// ── 배속 버튼 + 위로 펴지는 메뉴 ──
// 메뉴는 position:absolute 라 부모 높이에 안 잡히지만 scrollHeight 에는 잡힌다(BD9).
// 그래서 바 위로 펴고, 화면 높이(148px)를 메뉴(102px) + 버튼(26px) + 여백이 들어가게 잡아 둔다.
.spd { position: absolute; right: $sp-2; bottom: $sp-2; }

.spd__btn {
  box-sizing: border-box;
  height: 26px;
  display: inline-flex; align-items: center; gap: $sp-1;
  padding: 0 $sp-2;
  border: 0;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .74);
  color: #fff;
  cursor: pointer;
  transition: background $duration $easing, transform $duration $easing;
}
.spd__btn:hover { background: rgba(23, 20, 26, .92); }
.spd__btn:active { transform: scale(.96); }
.spd__btn:focus-visible { outline: 2px solid $stage-yellow; outline-offset: 2px; }
.pl.is-open .spd__btn { background: rgba(47, 109, 246, .92); }
.spd__ic { display: inline-flex; }
.spd__valwrap { position: relative; display: block; min-width: 34px; height: 14px; }
.spd__val, .spd__alt {
  position: absolute; left: 0; top: 0;
  white-space: nowrap;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px; line-height: 14px; font-weight: 700;
}
.spd__alt { opacity: 0; }

.spd__menu {
  --i: 2;
  position: absolute; right: 0; bottom: calc(100% + 4px);
  box-sizing: border-box;
  width: 92px;
  overflow: hidden;
  border-radius: $r-control;
  background: rgba(23, 20, 26, .95);
  box-shadow: $shadow-press;
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px) scale(.72);
  transform-origin: right bottom; // 규칙8: 버튼 모서리서 펼침
  transition: opacity $duration $easing, transform $duration $easing;
}
.pl.is-open .spd__menu { opacity: 1; pointer-events: auto; transform: none; }

.spd__mark {
  position: absolute; left: 0; right: 0; top: 0;
  height: $row;
  background: rgba(47, 109, 246, .85);
  transform: translateY(calc(#{$row} * var(--i)));
  transition: transform $duration $easing;
}

.spd__item {
  position: relative;
  box-sizing: border-box;
  width: 100%; height: $row;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 $sp-2;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: rgba(255, 255, 255, .82);
  cursor: pointer;
  text-align: left;
}
.spd__item:hover { color: #fff; }
.spd__item:focus-visible { outline: 2px solid $stage-yellow; outline-offset: -2px; }
.spd__item[aria-checked="true"] { color: #fff; }
.spd__lab {
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px; line-height: $row; font-weight: 700;
}
.spd__ck { display: inline-flex; color: $stage-yellow; opacity: 0; }
.spd__item[aria-checked="true"] .spd__ck { opacity: 1; }

// ── 자동 루프: 메뉴가 열리고 1배 → 1.5배 → 0.5배 → 1배 로 골라진다.
//    체크·라벨 교체는 steps(1, end) 한 프레임 컷, 진행 바 기울기가 배속대로 달라진다.
//    복귀는 90% 안에 (24프레임의 마지막은 95.8% 지점) ──
.pl.is-demo .spd__menu {
  animation-name: spd-open;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
@keyframes spd-open {
  // 여닫는 구간을 한 프레임(4.17%) 안으로 좁힌다 — 페이드 중간 프레임이 poster 로 뽑혀 메뉴가 반투명하게 나왔다 (실측 2026-09-12)
  0%, 9% { opacity: 0; transform: translateY(6px) scale(.72); }
  10%, 80% { opacity: 1; transform: none; }
  81%, 100% { opacity: 0; transform: translateY(6px) scale(.72); }
}

.pl.is-demo .spd__mark {
  animation-name: spd-mark;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes spd-mark {
  0%, 29% { transform: translateY($row * 2); }
  30%, 54% { transform: translateY($row * 4); }
  55%, 77% { transform: translateY(0); }
  78%, 100% { transform: translateY($row * 2); }
}

.pl.is-demo .spd__item:nth-of-type(1) .spd__ck,
.pl.is-demo .spd__alt--slow {
  animation-name: spd-slow;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.pl.is-demo .spd__item:nth-of-type(3) .spd__ck,
.pl.is-demo .spd__val {
  animation-name: spd-one;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.pl.is-demo .spd__item:nth-of-type(5) .spd__ck,
.pl.is-demo .spd__alt--fast {
  animation-name: spd-fast;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes spd-one  { 0%, 29% { opacity: 1; } 30%, 77% { opacity: 0; } 78%, 100% { opacity: 1; } }
@keyframes spd-fast { 0%, 29% { opacity: 0; } 30%, 54% { opacity: 1; } 55%, 100% { opacity: 0; } }
@keyframes spd-slow { 0%, 54% { opacity: 0; } 55%, 77% { opacity: 1; } 78%, 100% { opacity: 0; } }

.pl.is-demo .pl__fill {
  animation-name: spd-fill;
  animation-duration: $dur-loop;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes spd-fill {
  0%   { transform: scaleX(.14); }   // 1배
  30%  { transform: scaleX(.26); }   // 여기서 1.5배 — 기울기가 가팔라진다
  55%  { transform: scaleX(.41); }   // 여기서 0.5배 — 기울기가 완만해진다
  78%  { transform: scaleX(.456); }  // 다시 1배
  86%  { transform: scaleX(.488); }
  90%, 100% { transform: scaleX(.14); }
}

@media (prefers-reduced-motion: reduce) {
  .pl__stripes,
  .pl.is-demo .spd__menu, .pl.is-demo .spd__mark, .pl.is-demo .pl__fill,
  .pl.is-demo .spd__item:nth-of-type(1) .spd__ck,
  .pl.is-demo .spd__item:nth-of-type(3) .spd__ck,
  .pl.is-demo .spd__item:nth-of-type(5) .spd__ck,
  .pl.is-demo .spd__val, .pl.is-demo .spd__alt--fast, .pl.is-demo .spd__alt--slow {
    animation: none !important;
  }
  .spd__menu, .spd__mark, .spd__btn { transition: none; }
}

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

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

.pl {
  position: relative;
  box-sizing: border-box;
  width: min(392px, 92vw);
  margin: 0;
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  overflow: hidden;
}

.pl__screen {
  position: relative;
  height: clamp(148px, 34vw, 164px);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(47, 109, 246, 0.58), rgba(23, 20, 26, 0.94));
}

.pl__stripes {
  position: absolute;
  inset: 0 -72px;
  background: repeating-linear-gradient(90deg, rgba(255, 247, 230, 0.16) 0 12px, transparent 12px 32px);
  animation-name: pl-pan;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes pl-pan {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-64px);
  }
}
.pl__world {
  position: absolute;
  inset: 0;
}

.pl__sun {
  position: absolute;
  right: 22%;
  top: 16%;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 210, 63, 0.95);
  box-shadow: 0 0 0 8px rgba(255, 210, 63, 0.22);
}

.pl__hill {
  position: absolute;
  bottom: -46%;
  height: 82%;
  border-radius: 50%;
}

.pl__hill--a {
  left: -14%;
  width: 72%;
  background: rgba(255, 247, 230, 0.14);
}

.pl__hill--b {
  right: -18%;
  width: 62%;
  background: rgba(255, 247, 230, 0.08);
}

.pl__top {
  position: absolute;
  left: 8px;
  top: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.pl__clock, .pl__badge {
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(23, 20, 26, 0.62);
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
}

.pl__clock {
  color: #fff;
}

.pl__badge {
  color: rgba(255, 255, 255, 0.82);
  font-weight: 600;
}

.pl__time {
  position: absolute;
  left: 8px;
  bottom: 8px;
  color: #fff;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 14px;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(23, 20, 26, 0.7);
}

.pl__time b {
  font-weight: 700;
}

.pl__fillwrap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: rgba(255, 255, 255, 0.24);
}

.pl__fill {
  display: block;
  height: 100%;
  background: #2f6df6;
  transform-origin: left center;
  transform: scaleX(0.14);
}

.spd {
  position: absolute;
  right: 8px;
  bottom: 8px;
}

.spd__btn {
  box-sizing: border-box;
  height: 26px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 8px;
  border: 0;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.74);
  color: #fff;
  cursor: pointer;
  transition: background 220ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.spd__btn:hover {
  background: rgba(23, 20, 26, 0.92);
}

.spd__btn:active {
  transform: scale(0.96);
}

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

.pl.is-open .spd__btn {
  background: rgba(47, 109, 246, 0.92);
}

.spd__ic {
  display: inline-flex;
}

.spd__valwrap {
  position: relative;
  display: block;
  min-width: 34px;
  height: 14px;
}

.spd__val, .spd__alt {
  position: absolute;
  left: 0;
  top: 0;
  white-space: nowrap;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 14px;
  font-weight: 700;
}

.spd__alt {
  opacity: 0;
}

.spd__menu {
  --i: 2;
  position: absolute;
  right: 0;
  bottom: calc(100% + 4px);
  box-sizing: border-box;
  width: 92px;
  overflow: hidden;
  border-radius: 12px;
  background: rgba(23, 20, 26, 0.95);
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px) scale(0.72);
  transform-origin: right bottom;
  transition: opacity 220ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.pl.is-open .spd__menu {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.spd__mark {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 17px;
  background: rgba(47, 109, 246, 0.85);
  transform: translateY(calc(17px * var(--i)));
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.spd__item {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  height: 17px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.82);
  cursor: pointer;
  text-align: left;
}

.spd__item:hover {
  color: #fff;
}

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

.spd__item[aria-checked=true] {
  color: #fff;
}

.spd__lab {
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 17px;
  font-weight: 700;
}

.spd__ck {
  display: inline-flex;
  color: #ffd23f;
  opacity: 0;
}

.spd__item[aria-checked=true] .spd__ck {
  opacity: 1;
}

.pl.is-demo .spd__menu {
  animation-name: spd-open;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes spd-open {
  0%, 9% {
    opacity: 0;
    transform: translateY(6px) scale(0.72);
  }
  10%, 80% {
    opacity: 1;
    transform: none;
  }
  81%, 100% {
    opacity: 0;
    transform: translateY(6px) scale(0.72);
  }
}
.pl.is-demo .spd__mark {
  animation-name: spd-mark;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes spd-mark {
  0%, 29% {
    transform: translateY(34px);
  }
  30%, 54% {
    transform: translateY(68px);
  }
  55%, 77% {
    transform: translateY(0);
  }
  78%, 100% {
    transform: translateY(34px);
  }
}
.pl.is-demo .spd__item:nth-of-type(1) .spd__ck,
.pl.is-demo .spd__alt--slow {
  animation-name: spd-slow;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.pl.is-demo .spd__item:nth-of-type(3) .spd__ck,
.pl.is-demo .spd__val {
  animation-name: spd-one;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.pl.is-demo .spd__item:nth-of-type(5) .spd__ck,
.pl.is-demo .spd__alt--fast {
  animation-name: spd-fast;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes spd-one {
  0%, 29% {
    opacity: 1;
  }
  30%, 77% {
    opacity: 0;
  }
  78%, 100% {
    opacity: 1;
  }
}
@keyframes spd-fast {
  0%, 29% {
    opacity: 0;
  }
  30%, 54% {
    opacity: 1;
  }
  55%, 100% {
    opacity: 0;
  }
}
@keyframes spd-slow {
  0%, 54% {
    opacity: 0;
  }
  55%, 77% {
    opacity: 1;
  }
  78%, 100% {
    opacity: 0;
  }
}
.pl.is-demo .pl__fill {
  animation-name: spd-fill;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes spd-fill {
  0% {
    transform: scaleX(0.14);
  }
  30% {
    transform: scaleX(0.26);
  }
  55% {
    transform: scaleX(0.41);
  }
  78% {
    transform: scaleX(0.456);
  }
  86% {
    transform: scaleX(0.488);
  }
  90%, 100% {
    transform: scaleX(0.14);
  }
}
@media (prefers-reduced-motion: reduce) {
  .pl__stripes,
  .pl.is-demo .spd__menu, .pl.is-demo .spd__mark, .pl.is-demo .pl__fill,
  .pl.is-demo .spd__item:nth-of-type(1) .spd__ck,
  .pl.is-demo .spd__item:nth-of-type(3) .spd__ck,
  .pl.is-demo .spd__item:nth-of-type(5) .spd__ck,
  .pl.is-demo .spd__val, .pl.is-demo .spd__alt--fast, .pl.is-demo .spd__alt--slow {
    animation: none !important;
  }
  .spd__menu, .spd__mark, .spd__btn {
    transition: none;
  }
}

// 실제 동작: 배속 메뉴를 여닫고, 고른 배속만큼 더미 Play 시계와 진행 바가 빨라지거나 느려진다.
var root = document.getElementById('pl'), btn = document.getElementById('sbtn'),
    menu = document.getElementById('menu'), clock = document.getElementById('clock'),
    now = document.getElementById('t-now'), fill = document.getElementById('fill'),
    val = document.getElementById('val'),
    items = [].slice.call(menu.querySelectorAll('[role="menuitemradio"]'));
var DUR = 180, t = 18, rate = 1, i = 2, open = false;
function fmt(s) { s = Math.floor(s); return Math.floor(s / 60) + ':' + ('0' + (s % 60)).slice(-2); }
setInterval(function () {
  t = (t + 0.25 * rate) % DUR;
  clock.textContent = fmt(t);
  now.textContent = fmt(t);
  fill.style.transform = 'scaleX(' + (t / DUR).toFixed(4) + ')';
}, 250);
function pick(n) {
  i = n;
  rate = parseFloat(items[n].getAttribute('data-r'));
  items.forEach(function (b, k) { b.setAttribute('aria-checked', String(k === n)); });
  menu.style.setProperty('--i', String(n));
  val.textContent = items[n].querySelector('.spd__lab').textContent;
}
function toggle(on) {
  root.classList.remove('is-demo');
  open = on;
  root.classList.toggle('is-open', on);
  btn.setAttribute('aria-expanded', String(on));
  if (on) items[i].focus({ preventScroll: true }); else btn.focus({ preventScroll: true });
}
btn.addEventListener('click', function () { toggle(!open); });
items.forEach(function (b, k) { b.addEventListener('click', function () { pick(k); toggle(false); }); });
menu.addEventListener('keydown', function (e) {
  var n = i;
  if (e.key === 'Escape') { toggle(false); e.preventDefault(); return; }
  if (e.key === 'Enter' || e.key === ' ') { pick(i); toggle(false); e.preventDefault(); return; }
  if (e.key === 'ArrowDown') n = (i + 1) % items.length;
  else if (e.key === 'ArrowUp') n = (i + items.length - 1) % items.length;
  else return;
  i = n;
  items[i].focus({ preventScroll: true });
  e.preventDefault();
});
document.addEventListener('click', function (e) { if (open && !e.target.closest('.spd')) toggle(false); });

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

export type SpeedMenuProps = {
  /** 더미 영상 길이(초) */
  total?: number;
  /** 시작 위치(초) */
  start?: number;
  /** 고를 수 있는 배속 */
  rates?: number[];
  duration?: number;
  easing?: string;
  color?: string;
};

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

// TS7006 방지 — 'react' 의 이벤트 제네릭 대신 필요한 필드만 로컬로 선언한다
type KeyEvt = { key: string; preventDefault: () => void };

function fmt(s: number) {
  const n = Math.floor(s);
  return Math.floor(n / 60) + ":" + ("0" + (n % 60)).slice(-2);
}

function SpeedIcon() {
  return (
    <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true">
      <g fill="currentColor">
        <path d="M232 152v24a8 8 0 0 1-8 8H32a8 8 0 0 1-8-8v-22.87C24 95.65 70.15 48.2 127.63 48A104 104 0 0 1 232 152" opacity=".2" />
        <path d="M207.06 72.67A111.24 111.24 0 0 0 128 40h-.4C66.07 40.21 16 91 16 153.13V176a16 16 0 0 0 16 16h192a16 16 0 0 0 16-16v-24a111.25 111.25 0 0 0-32.94-79.33M224 176H119.71l54.76-75.3a8 8 0 0 0-12.94-9.42L99.92 176H32v-22.87c0-3.08.15-6.12.43-9.13H56a8 8 0 0 0 0-16H35.27c10.32-38.86 44-68.24 84.73-71.66V80a8 8 0 0 0 16 0V56.33A96.14 96.14 0 0 1 221 128h-21a8 8 0 0 0 0 16h23.67c.21 2.65.33 5.31.33 8Z" />
      </g>
    </svg>
  );
}

function CheckIcon() {
  return (
    <svg viewBox="0 0 256 256" width="13" height="13" aria-hidden="true">
      <g fill="currentColor">
        <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>
  );
}

export default function SpeedMenu({
  total = 180,
  start = 18,
  rates = [0.5, 0.75, 1, 1.25, 1.5, 2],
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
}: SpeedMenuProps) {
  const [open, setOpen] = useState(false);
  const [i, setI] = useState(2);
  const [t, setT] = useState(start);
  const rootRef = useRef<HTMLDivElement>(null);
  const btnRef = useRef<HTMLButtonElement>(null);
  const menuRef = useRef<HTMLDivElement>(null);
  const rate = rates[i];
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const menuVars: MenuVars = { "--i": String(i) };

  // 더미 재생 시계 — 고른 배속만큼 빨라지거나 느려진다 (바닐라의 setInterval(250ms, +0.25×rate))
  useEffect(() => {
    const id = setInterval(() => setT((p) => (p + 0.25 * rate) % total), 250);
    return () => clearInterval(id);
  }, [rate, total]);

  // 바깥을 누르면 닫는다
  useEffect(() => {
    function onDocClick(e: MouseEvent) {
      if (rootRef.current && !rootRef.current.contains(e.target as Node)) setOpen(false);
    }
    document.addEventListener("click", onDocClick);
    return () => document.removeEventListener("click", onDocClick);
  }, []);

  function focusItem(n: number) {
    menuRef.current?.querySelectorAll<HTMLElement>('[role="menuitemradio"]')[n]?.focus({ preventScroll: true });
  }

  useEffect(() => {
    if (open) focusItem(i);
    // 닫힐 때 버튼으로 돌려보내는 건 toggle 에서 직접 한다
  }, [open]);

  function close() {
    setOpen(false);
    btnRef.current?.focus({ preventScroll: true });
  }

  return (
    <figure className={`${styles.player} ${open ? styles.isOpen : ""}`} style={vars}>
      <div className={styles.screen}>
        <div className={styles.stripes} aria-hidden="true" />
        <div className={styles.world} aria-hidden="true">
          <span className={styles.sun} />
          <span className={`${styles.hill} ${styles.hillA}`} />
          <span className={`${styles.hill} ${styles.hillB}`} />
        </div>
        <div className={styles.top}>
          <span className={styles.clock}>{fmt(t)}</span>
          <span className={styles.badge}>{fmt(total)}</span>
        </div>

        <div className={styles.spd} ref={rootRef}>
          <div
            ref={menuRef}
            className={styles.menu}
            style={menuVars}
            id="spd-menu"
            role="menu"
            aria-label="재생 속도"
            onKeyDown={(e: KeyEvt) => {
              if (e.key === "Escape") { close(); e.preventDefault(); return; }
              if (e.key === "Enter" || e.key === " ") { close(); e.preventDefault(); return; }
              let n = i;
              if (e.key === "ArrowDown") n = (i + 1) % rates.length;
              else if (e.key === "ArrowUp") n = (i + rates.length - 1) % rates.length;
              else return;
              setI(n);
              focusItem(n);
              e.preventDefault();
            }}
          >
            <span className={styles.mark} aria-hidden="true" />
            {rates.map((r, k) => (
              <button
                key={r}
                className={styles.item}
                type="button"
                role="menuitemradio"
                aria-checked={k === i}
                onClick={() => { setI(k); close(); }}
              >
                <span className={styles.lab}>{r}배</span>
                <span className={styles.ck}>
                  <CheckIcon />
                </span>
              </button>
            ))}
          </div>
          <button
            ref={btnRef}
            className={styles.btn}
            type="button"
            aria-haspopup="menu"
            aria-expanded={open}
            aria-controls="spd-menu"
            aria-label="재생 속도"
            onClick={() => setOpen((o) => !o)}
          >
            <span className={styles.ic} aria-hidden="true">
              <SpeedIcon />
            </span>
            <span className={styles.valwrap}>
              <span className={styles.val}>{rate}배</span>
            </span>
          </button>
        </div>

        <span className={styles.time}>
          <b>{fmt(t)}</b> / {fmt(total)}
        </span>
        <span className={styles.fillwrap} aria-hidden="true">
          <span className={styles.fill} style={{ transform: `scaleX(${(t / total).toFixed(4)})` }} />
        </span>
      </div>
    </figure>
  );
}