02ロッカー電源スイッチ

<main class="stage">
<div class="rs is-demo" id="rs">
  <section class="rs__plate">
    <p class="rs__head"><span class="rs__lamp" aria-hidden="true"></span><span class="rs__onWord">ON</span></p>
    <div class="rs__bezel">
      <button class="rs__rocker" id="rsRocker" type="button" role="switch" aria-checked="false" aria-label="電源ロッカー">
        <span class="rs__cap rs__capTop"><b class="rs__io">I</b></span>
        <span class="rs__cap rs__capBottom"><b class="rs__io">O</b></span>
      </button>
    </div>
    <p class="rs__state" role="status"><span class="rs__wordOff">切</span><span class="rs__wordOn">入</span></p>
  </section>
</div>
</main>

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

// 로커 전원 스위치 — 윗면(I)을 누르면 누른 쪽이 translateY 로 가라앉으며
// inset 그림자가 깊어지고 반대쪽(O)이 떠오른다. 두 cap 의 그림자 리스트는
// 구조를 맞춰(둘 다 inset 2장) 보간이 되게 했다. 켜짐은 주황 표시등과 ON 글자로 —
// 색만으로 상태를 알리지 않는다. role="switch" + aria-checked.
// 미리보기(.is-demo)는 위·아래를 번갈아 눌러 보고 LED·단어는 steps(1,end) 컷.

$duration: $dur-quick;
$easing: $ease-spring;
$color: $stage-paper;

@include stage($stage-yellow);

.rs { display: grid; place-items: center; width: 100%; }

.rs__plate {
  box-sizing: border-box; width: clamp(136px, 44vw, 164px);
  display: flex; flex-direction: column; align-items: center; gap: $sp-2;
  padding: $sp-3; border-radius: $r-card;
  background: linear-gradient(180deg, rgba($subject-ink, .06), rgba($subject-ink, 0) 26%, rgba($subject-ink, 0) 74%, rgba($subject-ink, .10)), $color;
  box-shadow: $shadow-raised, inset 0 1px 0 rgba($stage-paper, .9);
}

.rs__head { display: flex; align-items: center; gap: $sp-2; margin: 0; height: 18px; }
.rs__lamp {
  width: 12px; height: 12px; border-radius: 50%; flex: 0 0 auto;
  background: rgba($subject-ink, .16);
  box-shadow: inset 0 1px 3px rgba($subject-ink, .5), 0 0 0 3px rgba($subject-ink, .82);
}
.rs__onWord {
  font-weight: 800; font-size: clamp(10px, 2.6vw, 12px); line-height: 1;
  letter-spacing: .2em; color: rgba($subject-ink, .74);
}

// ── 로커 ─────────────────────────────────────────────────────
.rs__bezel {
  padding: $sp-1; border-radius: $r-control;
  background: rgba($subject-ink, .26);
  box-shadow: inset 0 3px 6px rgba($subject-ink, .55), 0 1px 0 rgba($stage-paper, .8);
}
.rs__rocker {
  display: flex; flex-direction: column; margin: 0; padding: 0; border: 0;
  width: 84px; height: 132px; background: transparent; cursor: pointer;
}
.rs__rocker:focus-visible { outline: 2px solid $subject-ink; outline-offset: 2px; border-radius: $r-control; }

.rs__cap {
  display: flex; align-items: center; justify-content: center;
  width: 84px; height: 66px;
  transition: transform $duration $easing, box-shadow $duration $easing;
}
.rs__capTop {
  border-radius: $r-sm $r-sm 0 0;
  background: linear-gradient(180deg, $color, rgba($subject-ink, .10)), $color;
  transform: translateY(-3px);
  box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85);
}
.rs__capBottom {
  border-radius: 0 0 $r-sm $r-sm;
  background: linear-gradient(180deg, rgba($subject-ink, .05), rgba($subject-ink, .17)), $color;
  transform: translateY(3px);
  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40);
}
.rs__io {
  font-weight: 800; font-size: 13px; line-height: 1; color: rgba($subject-ink, .76);
}

// 켜짐 — 윗 cap 이 가라앉고 아랫cap 이 뜬다. 표시등·ON 글자·상태 단어가 함께 바뀐다
.rs.is-on .rs__capTop {
  transform: translateY(3px);
  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40);
}
.rs.is-on .rs__capBottom {
  transform: translateY(-3px);
  box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85);
}
.rs.is-on .rs__lamp {
  background: $stage-orange;
  box-shadow: 0 0 12px rgba($stage-orange, .8), 0 0 0 3px rgba($subject-ink, .82);
}
.rs.is-on .rs__onWord { color: $subject-orange-deep; }
.rs__state { position: relative; margin: 0; width: 60px; height: 16px; }
.rs__wordOff, .rs__wordOn {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: clamp(11px, 2.8vw, 13px); line-height: 1;
}
.rs__wordOff { color: $subject-ink; }
.rs__wordOn { display: none; }
.rs.is-on .rs__wordOn { display: flex; }
.rs.is-on .rs__wordOff { display: none; }

// ── 미리보기 루프(2초 한 바퀴) ────────────────────────────────
// 위를 누름(오버슈트 4px) → 유지 → 놓음(튕겨 올라옴) → 유지. 컷 요소는 steps(1,end).
.rs.is-demo .rs__capTop {
  animation-name: rsPressTop; animation-duration: $dur-loop;
  animation-timing-function: $easing; animation-iteration-count: infinite;
}
@keyframes rsPressTop {
  0%   { transform: translateY(-3px); box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85); }
  12%  { transform: translateY(4px);  box-shadow: inset 0 5px 9px rgba($subject-ink, .38), inset 0 -1px 0 rgba($stage-paper, .35); }
  18%  { transform: translateY(3px);  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40); }
  46%  { transform: translateY(3px);  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40); }
  58%  { transform: translateY(-4px); box-shadow: inset 0 -4px 7px rgba($subject-ink, .08), inset 0 3px 0 rgba($stage-paper, .9); }
  64%  { transform: translateY(-3px); box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85); }
  100% { transform: translateY(-3px); box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85); }
}
.rs.is-demo .rs__capBottom {
  animation-name: rsPressBottom; animation-duration: $dur-loop;
  animation-timing-function: $easing; animation-iteration-count: infinite;
}
@keyframes rsPressBottom {
  0%   { transform: translateY(3px);  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40); }
  12%  { transform: translateY(-4px); box-shadow: inset 0 -4px 7px rgba($subject-ink, .08), inset 0 3px 0 rgba($stage-paper, .9); }
  18%  { transform: translateY(-3px); box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85); }
  46%  { transform: translateY(-3px); box-shadow: inset 0 -3px 6px rgba($subject-ink, .10), inset 0 2px 0 rgba($stage-paper, .85); }
  58%  { transform: translateY(4px);  box-shadow: inset 0 5px 9px rgba($subject-ink, .38), inset 0 -1px 0 rgba($stage-paper, .35); }
  64%  { transform: translateY(3px);  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40); }
  100% { transform: translateY(3px);  box-shadow: inset 0 4px 8px rgba($subject-ink, .32), inset 0 -1px 0 rgba($stage-paper, .40); }
}
.rs.is-demo .rs__lamp {
  animation-name: rsLamp; animation-duration: $dur-loop;
  animation-timing-function: steps(1, end); animation-iteration-count: infinite;
}
@keyframes rsLamp {
  0%   { background: rgba($subject-ink, .16); box-shadow: inset 0 1px 3px rgba($subject-ink, .5), 0 0 0 3px rgba($subject-ink, .82); }
  16%  { background: $stage-orange; box-shadow: 0 0 12px rgba($stage-orange, .8), 0 0 0 3px rgba($subject-ink, .82); }
  62%  { background: rgba($subject-ink, .16); box-shadow: inset 0 1px 3px rgba($subject-ink, .5), 0 0 0 3px rgba($subject-ink, .82); }
  100% { background: rgba($subject-ink, .16); box-shadow: inset 0 1px 3px rgba($subject-ink, .5), 0 0 0 3px rgba($subject-ink, .82); }
}
.rs.is-demo .rs__onWord {
  animation-name: rsOnWord; animation-duration: $dur-loop;
  animation-timing-function: steps(1, end); animation-iteration-count: infinite;
}
@keyframes rsOnWord {
  0%   { color: rgba($subject-ink, .74); }
  16%  { color: $subject-orange-deep; }
  62%  { color: rgba($subject-ink, .74); }
  100% { color: rgba($subject-ink, .74); }
}
.rs.is-demo .rs__wordOn { display: flex; opacity: 0; }
.rs.is-demo .rs__wordOff { opacity: 1; }
.rs.is-demo .rs__wordOn {
  animation-name: rsWordOn; animation-duration: $dur-loop;
  animation-timing-function: steps(1, end); animation-iteration-count: infinite;
}
@keyframes rsWordOn {
  0%   { opacity: 0; }
  16%  { opacity: 1; }
  62%  { opacity: 0; }
  100% { opacity: 0; }
}
.rs.is-demo .rs__wordOff {
  animation-name: rsWordOff; animation-duration: $dur-loop;
  animation-timing-function: steps(1, end); animation-iteration-count: infinite;
}
@keyframes rsWordOff {
  0%   { opacity: 1; }
  16%  { opacity: 0; }
  62%  { opacity: 1; }
  100% { opacity: 1; }
}

@media (max-width: 340px) {
  .rs__plate { gap: $sp-1; padding: $sp-2; }
  .rs__head { height: 14px; }
  .rs__rocker { width: 68px; height: 104px; }
  .rs__cap { width: 68px; height: 52px; }
  .rs__io { font-size: 11px; }
  .rs__state { height: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .rs.is-demo .rs__capTop { animation: none !important; transform: translateY(-3px) !important; }
  .rs.is-demo .rs__capBottom { animation: none !important; transform: translateY(3px) !important; }
  .rs.is-demo .rs__lamp { animation: none !important; }
  .rs.is-demo .rs__onWord { animation: none !important; }
  .rs.is-demo .rs__wordOn { animation: none !important; opacity: 0 !important; }
  .rs.is-demo .rs__wordOff { animation: none !important; 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: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.rs {
  display: grid;
  place-items: center;
  width: 100%;
}

.rs__plate {
  box-sizing: border-box;
  width: clamp(136px, 44vw, 164px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(23, 20, 26, 0.06), rgba(23, 20, 26, 0) 26%, rgba(23, 20, 26, 0) 74%, rgba(23, 20, 26, 0.1)), #ffffff;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.rs__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  height: 18px;
}

.rs__lamp {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex: 0 0 auto;
  background: rgba(23, 20, 26, 0.16);
  box-shadow: inset 0 1px 3px rgba(23, 20, 26, 0.5), 0 0 0 3px rgba(23, 20, 26, 0.82);
}

.rs__onWord {
  font-weight: 800;
  font-size: clamp(10px, 2.6vw, 12px);
  line-height: 1;
  letter-spacing: 0.2em;
  color: rgba(23, 20, 26, 0.74);
}

.rs__bezel {
  padding: 4px;
  border-radius: 12px;
  background: rgba(23, 20, 26, 0.26);
  box-shadow: inset 0 3px 6px rgba(23, 20, 26, 0.55), 0 1px 0 rgba(255, 255, 255, 0.8);
}

.rs__rocker {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
  border: 0;
  width: 84px;
  height: 132px;
  background: transparent;
  cursor: pointer;
}

.rs__rocker:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
  border-radius: 12px;
}

.rs__cap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 84px;
  height: 66px;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.rs__capTop {
  border-radius: 8px 8px 0 0;
  background: linear-gradient(180deg, #ffffff, rgba(23, 20, 26, 0.1)), #ffffff;
  transform: translateY(-3px);
  box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
}

.rs__capBottom {
  border-radius: 0 0 8px 8px;
  background: linear-gradient(180deg, rgba(23, 20, 26, 0.05), rgba(23, 20, 26, 0.17)), #ffffff;
  transform: translateY(3px);
  box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
}

.rs__io {
  font-weight: 800;
  font-size: 13px;
  line-height: 1;
  color: rgba(23, 20, 26, 0.76);
}

.rs.is-on .rs__capTop {
  transform: translateY(3px);
  box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
}

.rs.is-on .rs__capBottom {
  transform: translateY(-3px);
  box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
}

.rs.is-on .rs__lamp {
  background: #ff4d1f;
  box-shadow: 0 0 12px rgba(255, 77, 31, 0.8), 0 0 0 3px rgba(23, 20, 26, 0.82);
}

.rs.is-on .rs__onWord {
  color: #c93000;
}

.rs__state {
  position: relative;
  margin: 0;
  width: 60px;
  height: 16px;
}

.rs__wordOff, .rs__wordOn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: clamp(11px, 2.8vw, 13px);
  line-height: 1;
}

.rs__wordOff {
  color: #17141a;
}

.rs__wordOn {
  display: none;
}

.rs.is-on .rs__wordOn {
  display: flex;
}

.rs.is-on .rs__wordOff {
  display: none;
}

.rs.is-demo .rs__capTop {
  animation-name: rsPressTop;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes rsPressTop {
  0% {
    transform: translateY(-3px);
    box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
  }
  12% {
    transform: translateY(4px);
    box-shadow: inset 0 5px 9px rgba(23, 20, 26, 0.38), inset 0 -1px 0 rgba(255, 255, 255, 0.35);
  }
  18% {
    transform: translateY(3px);
    box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
  }
  46% {
    transform: translateY(3px);
    box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
  }
  58% {
    transform: translateY(-4px);
    box-shadow: inset 0 -4px 7px rgba(23, 20, 26, 0.08), inset 0 3px 0 rgba(255, 255, 255, 0.9);
  }
  64% {
    transform: translateY(-3px);
    box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
  }
  100% {
    transform: translateY(-3px);
    box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
  }
}
.rs.is-demo .rs__capBottom {
  animation-name: rsPressBottom;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

@keyframes rsPressBottom {
  0% {
    transform: translateY(3px);
    box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
  }
  12% {
    transform: translateY(-4px);
    box-shadow: inset 0 -4px 7px rgba(23, 20, 26, 0.08), inset 0 3px 0 rgba(255, 255, 255, 0.9);
  }
  18% {
    transform: translateY(-3px);
    box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
  }
  46% {
    transform: translateY(-3px);
    box-shadow: inset 0 -3px 6px rgba(23, 20, 26, 0.1), inset 0 2px 0 rgba(255, 255, 255, 0.85);
  }
  58% {
    transform: translateY(4px);
    box-shadow: inset 0 5px 9px rgba(23, 20, 26, 0.38), inset 0 -1px 0 rgba(255, 255, 255, 0.35);
  }
  64% {
    transform: translateY(3px);
    box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
  }
  100% {
    transform: translateY(3px);
    box-shadow: inset 0 4px 8px rgba(23, 20, 26, 0.32), inset 0 -1px 0 rgba(255, 255, 255, 0.4);
  }
}
.rs.is-demo .rs__lamp {
  animation-name: rsLamp;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes rsLamp {
  0% {
    background: rgba(23, 20, 26, 0.16);
    box-shadow: inset 0 1px 3px rgba(23, 20, 26, 0.5), 0 0 0 3px rgba(23, 20, 26, 0.82);
  }
  16% {
    background: #ff4d1f;
    box-shadow: 0 0 12px rgba(255, 77, 31, 0.8), 0 0 0 3px rgba(23, 20, 26, 0.82);
  }
  62% {
    background: rgba(23, 20, 26, 0.16);
    box-shadow: inset 0 1px 3px rgba(23, 20, 26, 0.5), 0 0 0 3px rgba(23, 20, 26, 0.82);
  }
  100% {
    background: rgba(23, 20, 26, 0.16);
    box-shadow: inset 0 1px 3px rgba(23, 20, 26, 0.5), 0 0 0 3px rgba(23, 20, 26, 0.82);
  }
}
.rs.is-demo .rs__onWord {
  animation-name: rsOnWord;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes rsOnWord {
  0% {
    color: rgba(23, 20, 26, 0.74);
  }
  16% {
    color: #c93000;
  }
  62% {
    color: rgba(23, 20, 26, 0.74);
  }
  100% {
    color: rgba(23, 20, 26, 0.74);
  }
}
.rs.is-demo .rs__wordOn {
  display: flex;
  opacity: 0;
}

.rs.is-demo .rs__wordOff {
  opacity: 1;
}

.rs.is-demo .rs__wordOn {
  animation-name: rsWordOn;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes rsWordOn {
  0% {
    opacity: 0;
  }
  16% {
    opacity: 1;
  }
  62% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
.rs.is-demo .rs__wordOff {
  animation-name: rsWordOff;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes rsWordOff {
  0% {
    opacity: 1;
  }
  16% {
    opacity: 0;
  }
  62% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@media (max-width: 340px) {
  .rs__plate {
    gap: 4px;
    padding: 8px;
  }
  .rs__head {
    height: 14px;
  }
  .rs__rocker {
    width: 68px;
    height: 104px;
  }
  .rs__cap {
    width: 68px;
    height: 52px;
  }
  .rs__io {
    font-size: 11px;
  }
  .rs__state {
    height: 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .rs.is-demo .rs__capTop {
    animation: none !important;
    transform: translateY(-3px) !important;
  }
  .rs.is-demo .rs__capBottom {
    animation: none !important;
    transform: translateY(3px) !important;
  }
  .rs.is-demo .rs__lamp {
    animation: none !important;
  }
  .rs.is-demo .rs__onWord {
    animation: none !important;
  }
  .rs.is-demo .rs__wordOn {
    animation: none !important;
    opacity: 0 !important;
  }
  .rs.is-demo .rs__wordOff {
    animation: none !important;
    opacity: 1 !important;
  }
}

var root = document.getElementById('rs');
var rocker = document.getElementById('rsRocker');

function setOn(on) {
  rocker.setAttribute('aria-checked', on ? 'true' : 'false');
  root.classList.toggle('is-on', on);
}
function toggle() {
  root.classList.remove('is-demo');
  setOn(rocker.getAttribute('aria-checked') !== 'true');
}
rocker.addEventListener('pointerdown', function () { root.classList.remove('is-demo'); });
rocker.addEventListener('click', toggle);

// RockerSwitch — vanilla 판(run/013/demo/02-skeuo-rocker-switch/index.html) 의 React 포트.
// 윗면(I)을 누르면 그쪽이 가라앉고 반대쪽(O)이 뜬다. 값·키프레임은 vanilla 와 같다.
import { useState } from "react";
import styles from "./RockerSwitch.module.scss";

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

type Vars = { [k: string]: any };

const ROCKER_LABEL = "전원 로커";
const STATE_OFF = "꺼짐";
const STATE_ON = "켜짐";

export default function RockerSwitch({
  duration = 220,
  easing = "cubic-bezier(.2, .8, .2, 1)", // = $ease-spring
  color = "#ffffff",
}: RockerSwitchProps) {
  const [on, setOn] = useState(false);
  const [demo, setDemo] = useState(true);
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  const cls = [styles.root, demo ? styles.isDemo : "", on ? styles.isOn : ""].filter(Boolean).join(" ");

  function toggle() {
    setDemo(false);
    setOn((prev) => !prev);
  }
  function wake() {
    setDemo(false);
  }

  return (
    <main className={styles.stage}>
      <div className={cls} style={vars}>
        <section className={styles.plate}>
          <p className={styles.head}><span className={styles.lamp} aria-hidden="true"></span><span className={styles.onWord}>ON</span></p>
          <div className={styles.bezel}>
            <button
              className={styles.rocker}
              type="button"
              role="switch"
              aria-checked={on}
              aria-label={ROCKER_LABEL}
              onPointerDown={wake}
              onClick={toggle}
            >
              <span className={`${styles.cap} ${styles.capTop}`}><b className={styles.io}>I</b></span>
              <span className={`${styles.cap} ${styles.capBottom}`}><b className={styles.io}>O</b></span>
            </button>
          </div>
          <p className={styles.state} role="status">
            <span className={styles.wordOff}>{STATE_OFF}</span>
            <span className={styles.wordOn}>{STATE_ON}</span>
          </p>
        </section>
      </div>
    </main>
  );
}