03Webinar slot booking

<main class="stage is-demo">
  <section class="wb">
    <p class="wb__title">
      <span class="wb__title-ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="16" height="16"><g fill="currentColor"><path d="M216 48v40H40V48a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2"/><path d="M208 32h-24v-8a8 8 0 0 0-16 0v8H88v-8a8 8 0 0 0-16 0v8H48a16 16 0 0 0-16 16v160a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V48a16 16 0 0 0-16-16M72 48v8a8 8 0 0 0 16 0v-8h80v8a8 8 0 0 0 16 0v-8h24v32H48V48Zm136 160H48V96h160z"/></g></svg></span>
      Pick a webinar time
    </p>
    <div class="wb__slots" id="wb-slots" role="radiogroup" aria-label="Webinar sessions">
      <button class="wb__slot" type="button" role="radio" aria-checked="true" tabindex="0" data-t="Thu 8:00 PM">
        <span class="wb__ring" aria-hidden="true"></span>
        <span class="wb__day">Thu 8:00 PM</span>
        <span class="wb__seat">8 seats left</span>
        <span class="wb__ok" aria-hidden="true"><svg class="wb__ok-ic" viewBox="0 0 24 24" width="10" height="10"><polyline points="4 12 9 17 20 6" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg>Booked</span>
      </button>
      <button class="wb__slot" type="button" role="radio" aria-checked="false" tabindex="-1" data-t="Fri 11:00 AM">
        <span class="wb__ring" aria-hidden="true"></span>
        <span class="wb__day">Fri 11:00 AM</span>
        <span class="wb__seat">24 seats</span>
        <span class="wb__ok" aria-hidden="true"><svg class="wb__ok-ic" viewBox="0 0 24 24" width="10" height="10"><polyline points="4 12 9 17 20 6" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg>Booked</span>
      </button>
      <button class="wb__slot" type="button" role="radio" aria-checked="false" tabindex="-1" data-t="Fri 8:00 PM" disabled>
        <span class="wb__ring" aria-hidden="true"></span>
        <span class="wb__day">Fri 8:00 PM</span>
        <span class="wb__seat wb__seat--closed">Full</span>
        <span class="wb__ok" aria-hidden="true"><svg class="wb__ok-ic" viewBox="0 0 24 24" width="10" height="10"><polyline points="4 12 9 17 20 6" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/></svg>Booked</span>
      </button>
    </div>
    <p class="wb__cd" role="timer" aria-live="off">
      <span class="wb__cd-ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="14" height="14"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2"/><path d="M128 24a104 104 0 1 0 104 104A104.11 104.11 0 0 0 128 24m0 192a88 88 0 1 1 88-88a88.1 88.1 0 0 1-88 88m64-88a8 8 0 0 1-8 8h-56a8 8 0 0 1-8-8V72a8 8 0 0 1 16 0v48h48a8 8 0 0 1 8 8"/></g></svg></span>
      Registration closes in
      <span class="wb__clock" aria-hidden="true"><b class="wb__mm" id="wb-mm">14</b>:<span class="wb__d" id="wb-d1" style="--d:3"><span class="wb__strip"><b>0</b><b>1</b><b>2</b><b>3</b><b>4</b><b>5</b><b>6</b><b>7</b><b>8</b><b>9</b></span></span><span class="wb__d wb__d--s1" id="wb-d0" style="--d:2"><span class="wb__strip"><b>0</b><b>1</b><b>2</b><b>3</b><b>4</b><b>5</b><b>6</b><b>7</b><b>8</b><b>9</b></span></span></span>
      <span class="sr-only" id="wb-cdt">14 min 32 sec left</span>
    </p>
    <button class="wb__go" id="wb-go" type="button">Book this session</button>
    <p class="wb__msg" id="wb-msg" role="status" aria-live="polite">Pick a time and we'll hold your seat</p>
  </section>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;
$easing: $ease-pop;
$color: $subject-blue;

@include stage($stage-orange);

.wb {
  box-sizing: border-box; width: min(360px, 94vw);
  display: flex; flex-direction: column; gap: $sp-2;
  background: $subject-cream; color: $subject-ink;
  border-radius: $r-card; padding: $sp-4; box-shadow: $shadow-raised;
}

.wb__title { display: flex; align-items: center; gap: $sp-1; margin: 0; font-weight: 800; font-size: 14px; line-height: 1.3; }
.wb__title-ic { display: inline-flex; color: $color; }

.wb__slots { display: grid; grid-template-columns: repeat(3, 1fr); gap: $sp-2; }
.wb__slot {
  position: relative; box-sizing: border-box;
  display: flex; flex-direction: column; align-items: center; gap: $sp-1;
  padding: $sp-2; border: 1.5px solid rgba(23, 20, 26, .14); border-radius: $r-control;
  background: $stage-paper; color: $subject-ink; cursor: pointer;
  transform: translateY(0);
  transition: transform $dur-quick $easing;
}
.wb__slot[disabled] { background: rgba(23, 20, 26, .06); color: rgba(23, 20, 26, .42); cursor: not-allowed; }
.wb__slot:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

// 선택 링은 테두리색을 바꾸는 대신 겹쳐 둔 판을 opacity 로만 켠다 (transform·opacity 만 애니메이션)
.wb__ring {
  position: absolute; inset: 0; border: 2px solid $color; border-radius: $r-control; opacity: 0;
}
.wb__slot[aria-checked="true"] .wb__ring { opacity: 1; }
.wb__slot[aria-checked="true"] { transform: translateY(-2px); }

.wb__day { font-weight: 800; font-size: 11px; line-height: 1.2; }
.wb__seat { font-weight: 600; font-size: 10px; line-height: 1.2; color: rgba(23, 20, 26, .58); }
.wb__seat--closed {
  padding: 0 $sp-1; border-radius: $r-pill;
  background: rgba($error, .14); color: $error; font-weight: 800;
}

.wb__ok {
  display: inline-flex; align-items: center; gap: $sp-1;
  padding: 0 $sp-1; border-radius: $r-pill;
  background: rgba($color, .14); color: $color;
  font-weight: 800; font-size: 9px; line-height: 1.4;
  opacity: 0; transform: translateY(-8px);
  transition: opacity $dur-quick $ease-out, transform $dur-base $easing;
}
.wb__ok-ic { stroke-dasharray: 28; stroke-dashoffset: 28; transition: stroke-dashoffset $dur-base $ease-out; }
.wb__slot.is-ok .wb__ok { opacity: 1; transform: translateY(0); }
.wb__slot.is-ok .wb__ok-ic { stroke-dashoffset: 0; }

.wb__cd { display: flex; align-items: center; gap: $sp-1; margin: 0; font-weight: 600; font-size: 11px; line-height: 1.3; color: rgba(23, 20, 26, .7); }
.wb__cd-ic { display: inline-flex; color: $color; }

.wb__clock { display: inline-flex; align-items: flex-end; font-weight: 800; font-size: 13px; line-height: 1.15; color: $subject-ink; font-variant-numeric: tabular-nums; }
// 숫자 띠 — 창 하나 높이만 보이고 띠를 한 칸씩 올려 숫자를 바꾼다
.wb__d { display: block; overflow: hidden; width: .62em; height: 1.15em; }
.wb__strip { display: block; transform: translateY(calc(var(--d, 0) * -1.15em)); }
.wb__strip b { display: block; height: 1.15em; line-height: 1.15; font-weight: 800; text-align: center; }

.wb__go {
  padding: $sp-2 $sp-3; border: 0; border-radius: $r-control;
  background: $color; color: $stage-paper;
  font-weight: 800; font-size: 12px; line-height: 1.2; cursor: pointer;
}
.wb__go:focus-visible { outline: 2px solid $subject-ink; outline-offset: 2px; }

.wb__msg { margin: 0; min-height: 13px; font-weight: 500; font-size: 10px; line-height: 1.3; color: rgba(23, 20, 26, .6); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

// ── 측정용 자동 루프 ────────────────────────────────
// 선택이 1회차 → 2회차로 한 프레임에 옮겨 가고(컷), 카드가 살짝 떠오르며(translateY) 초 숫자 띠가 계속 흐른다
.stage.is-demo .wb__slot:nth-child(1) .wb__ring {
  animation-name: wb-ring-a; animation-duration: $duration;
  animation-timing-function: steps(1, end); animation-iteration-count: infinite;
}
.stage.is-demo .wb__slot:nth-child(2) .wb__ring {
  animation-name: wb-ring-b; animation-duration: $duration;
  animation-timing-function: steps(1, end); animation-iteration-count: infinite;
}
@keyframes wb-ring-a {
  0%, 43%   { opacity: 1; }
  44%, 100% { opacity: 0; }
}
@keyframes wb-ring-b {
  0%, 43%   { opacity: 0; }
  44%, 100% { opacity: 1; }
}
.stage.is-demo .wb__slot:nth-child(1) {
  animation-name: wb-lift-a; animation-duration: $duration;
  animation-timing-function: $easing; animation-iteration-count: infinite;
}
.stage.is-demo .wb__slot:nth-child(2) {
  animation-name: wb-lift-b; animation-duration: $duration;
  animation-timing-function: $easing; animation-iteration-count: infinite;
}
@keyframes wb-lift-a {
  0%, 38%   { transform: translateY(-2px); }
  52%, 100% { transform: translateY(0); }
}
@keyframes wb-lift-b {
  0%, 40%   { transform: translateY(0); }
  56%       { transform: translateY(-2px); }
  100%      { transform: translateY(-2px); }
}
// 확정 배지는 마지막 30% 에 한 번 내려앉는다 (사라지는 장면은 재현하지 않는다)
.stage.is-demo .wb__slot:nth-child(2) .wb__ok {
  animation-name: wb-badge; animation-duration: $duration;
  animation-timing-function: $easing; animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
@keyframes wb-badge {
  0%, 70% { opacity: 0; transform: translateY(-8px); }
  70.01%  { opacity: 1; transform: translateY(-8px); }
  86%     { opacity: 1; transform: translateY(0); }
  100%    { opacity: 1; transform: translateY(0); }
}
.stage.is-demo .wb__slot:nth-child(2) .wb__ok-ic {
  animation-name: wb-draw; animation-duration: $duration;
  animation-timing-function: $ease-out; animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
@keyframes wb-draw {
  0%, 70% { stroke-dashoffset: 28; }
  88%     { stroke-dashoffset: 0; }
  100%    { stroke-dashoffset: 0; }
}
// 초 자리는 JS 가 실제로 세지만, 루프에서는 띠가 한 칸씩 올라가며 초가 흐르는 것을 보여 준다
.stage.is-demo .wb__d--s1 .wb__strip {
  animation-name: wb-tick; animation-duration: $duration;
  animation-timing-function: steps(10, end); animation-iteration-count: infinite;
}
@keyframes wb-tick {
  from { transform: translateY(-10.35em); }
  to   { transform: translateY(1.15em); }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .wb__slot, .wb__ring, .wb__ok, .wb__ok-ic, .wb__strip,
  .stage.is-demo .wb__slot:nth-child(1), .stage.is-demo .wb__slot:nth-child(2),
  .stage.is-demo .wb__slot:nth-child(1) .wb__ring, .stage.is-demo .wb__slot:nth-child(2) .wb__ring,
  .stage.is-demo .wb__slot:nth-child(2) .wb__ok, .stage.is-demo .wb__slot:nth-child(2) .wb__ok-ic,
  .stage.is-demo .wb__d--s1 .wb__strip {
    animation: none !important;
    transition: none !important;
  }
  // 움직임은 꺼도 「어느 회차가 골라졌나」는 남긴다
  .stage.is-demo .wb__slot:nth-child(1) .wb__ring { opacity: 0 !important; }
  .stage.is-demo .wb__slot:nth-child(2) .wb__ring { opacity: 1 !important; }
  .stage.is-demo .wb__slot:nth-child(2) { transform: translateY(-2px) !important; }
  .stage.is-demo .wb__slot:nth-child(2) .wb__ok { opacity: 1 !important; transform: translateY(0) !important; }
  .stage.is-demo .wb__slot:nth-child(2) .wb__ok-ic { stroke-dashoffset: 0 !important; }
}

// ── 반응형(320×200) ──────────────────────────────────
@media (max-width: 340px), (max-height: 220px) {
  .wb { width: min(292px, 92vw); gap: $sp-1; padding: $sp-2; }
  .wb__title { font-size: 12px; }
  .wb__title-ic svg { width: 12px; height: 12px; }
  .wb__slots { gap: $sp-1; }
  .wb__slot { gap: 0; padding: $sp-1; }
  .wb__day { font-size: 10px; }
  .wb__seat { font-size: 9px; }
  .wb__ok { font-size: 8px; }
  .wb__cd { font-size: 9px; }
  .wb__cd-ic svg { width: 12px; height: 12px; }
  .wb__clock { font-size: 11px; }
  .wb__go { padding: $sp-1 $sp-2; font-size: 10px; }
  .wb__msg { min-height: 0; font-size: 9px; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.wb {
  box-sizing: border-box;
  width: min(360px, 94vw);
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: #fff7e6;
  color: #17141a;
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.wb__title {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  font-weight: 800;
  font-size: 14px;
  line-height: 1.3;
}

.wb__title-ic {
  display: inline-flex;
  color: #2f6df6;
}

.wb__slots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.wb__slot {
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px;
  border: 1.5px solid rgba(23, 20, 26, 0.14);
  border-radius: 12px;
  background: #ffffff;
  color: #17141a;
  cursor: pointer;
  transform: translateY(0);
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.wb__slot[disabled] {
  background: rgba(23, 20, 26, 0.06);
  color: rgba(23, 20, 26, 0.42);
  cursor: not-allowed;
}

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

.wb__ring {
  position: absolute;
  inset: 0;
  border: 2px solid #2f6df6;
  border-radius: 12px;
  opacity: 0;
}

.wb__slot[aria-checked=true] .wb__ring {
  opacity: 1;
}

.wb__slot[aria-checked=true] {
  transform: translateY(-2px);
}

.wb__day {
  font-weight: 800;
  font-size: 11px;
  line-height: 1.2;
}

.wb__seat {
  font-weight: 600;
  font-size: 10px;
  line-height: 1.2;
  color: rgba(23, 20, 26, 0.58);
}

.wb__seat--closed {
  padding: 0 4px;
  border-radius: 999px;
  background: rgba(194, 54, 26, 0.14);
  color: #c2361a;
  font-weight: 800;
}

.wb__ok {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 4px;
  border-radius: 999px;
  background: rgba(47, 109, 246, 0.14);
  color: #2f6df6;
  font-weight: 800;
  font-size: 9px;
  line-height: 1.4;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 220ms ease-out, transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.wb__ok-ic {
  stroke-dasharray: 28;
  stroke-dashoffset: 28;
  transition: stroke-dashoffset 300ms ease-out;
}

.wb__slot.is-ok .wb__ok {
  opacity: 1;
  transform: translateY(0);
}

.wb__slot.is-ok .wb__ok-ic {
  stroke-dashoffset: 0;
}

.wb__cd {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
  color: rgba(23, 20, 26, 0.7);
}

.wb__cd-ic {
  display: inline-flex;
  color: #2f6df6;
}

.wb__clock {
  display: inline-flex;
  align-items: flex-end;
  font-weight: 800;
  font-size: 13px;
  line-height: 1.15;
  color: #17141a;
  font-variant-numeric: tabular-nums;
}

.wb__d {
  display: block;
  overflow: hidden;
  width: 0.62em;
  height: 1.15em;
}

.wb__strip {
  display: block;
  transform: translateY(calc(var(--d, 0) * -1.15em));
}

.wb__strip b {
  display: block;
  height: 1.15em;
  line-height: 1.15;
  font-weight: 800;
  text-align: center;
}

.wb__go {
  padding: 8px 12px;
  border: 0;
  border-radius: 12px;
  background: #2f6df6;
  color: #ffffff;
  font-weight: 800;
  font-size: 12px;
  line-height: 1.2;
  cursor: pointer;
}

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

.wb__msg {
  margin: 0;
  min-height: 13px;
  font-weight: 500;
  font-size: 10px;
  line-height: 1.3;
  color: rgba(23, 20, 26, 0.6);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.stage.is-demo .wb__slot:nth-child(1) .wb__ring {
  animation-name: wb-ring-a;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.stage.is-demo .wb__slot:nth-child(2) .wb__ring {
  animation-name: wb-ring-b;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes wb-ring-a {
  0%, 43% {
    opacity: 1;
  }
  44%, 100% {
    opacity: 0;
  }
}
@keyframes wb-ring-b {
  0%, 43% {
    opacity: 0;
  }
  44%, 100% {
    opacity: 1;
  }
}
.stage.is-demo .wb__slot:nth-child(1) {
  animation-name: wb-lift-a;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

.stage.is-demo .wb__slot:nth-child(2) {
  animation-name: wb-lift-b;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes wb-lift-a {
  0%, 38% {
    transform: translateY(-2px);
  }
  52%, 100% {
    transform: translateY(0);
  }
}
@keyframes wb-lift-b {
  0%, 40% {
    transform: translateY(0);
  }
  56% {
    transform: translateY(-2px);
  }
  100% {
    transform: translateY(-2px);
  }
}
.stage.is-demo .wb__slot:nth-child(2) .wb__ok {
  animation-name: wb-badge;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes wb-badge {
  0%, 70% {
    opacity: 0;
    transform: translateY(-8px);
  }
  70.01% {
    opacity: 1;
    transform: translateY(-8px);
  }
  86% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}
.stage.is-demo .wb__slot:nth-child(2) .wb__ok-ic {
  animation-name: wb-draw;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

@keyframes wb-draw {
  0%, 70% {
    stroke-dashoffset: 28;
  }
  88% {
    stroke-dashoffset: 0;
  }
  100% {
    stroke-dashoffset: 0;
  }
}
.stage.is-demo .wb__d--s1 .wb__strip {
  animation-name: wb-tick;
  animation-duration: 2s;
  animation-timing-function: steps(10, end);
  animation-iteration-count: infinite;
}

@keyframes wb-tick {
  from {
    transform: translateY(-10.35em);
  }
  to {
    transform: translateY(1.15em);
  }
}
@media (prefers-reduced-motion: reduce) {
  .wb__slot, .wb__ring, .wb__ok, .wb__ok-ic, .wb__strip,
  .stage.is-demo .wb__slot:nth-child(1), .stage.is-demo .wb__slot:nth-child(2),
  .stage.is-demo .wb__slot:nth-child(1) .wb__ring, .stage.is-demo .wb__slot:nth-child(2) .wb__ring,
  .stage.is-demo .wb__slot:nth-child(2) .wb__ok, .stage.is-demo .wb__slot:nth-child(2) .wb__ok-ic,
  .stage.is-demo .wb__d--s1 .wb__strip {
    animation: none !important;
    transition: none !important;
  }
  .stage.is-demo .wb__slot:nth-child(1) .wb__ring {
    opacity: 0 !important;
  }
  .stage.is-demo .wb__slot:nth-child(2) .wb__ring {
    opacity: 1 !important;
  }
  .stage.is-demo .wb__slot:nth-child(2) {
    transform: translateY(-2px) !important;
  }
  .stage.is-demo .wb__slot:nth-child(2) .wb__ok {
    opacity: 1 !important;
    transform: translateY(0) !important;
  }
  .stage.is-demo .wb__slot:nth-child(2) .wb__ok-ic {
    stroke-dashoffset: 0 !important;
  }
}
@media (max-width: 340px), (max-height: 220px) {
  .wb {
    width: min(292px, 92vw);
    gap: 4px;
    padding: 8px;
  }
  .wb__title {
    font-size: 12px;
  }
  .wb__title-ic svg {
    width: 12px;
    height: 12px;
  }
  .wb__slots {
    gap: 4px;
  }
  .wb__slot {
    gap: 0;
    padding: 4px;
  }
  .wb__day {
    font-size: 10px;
  }
  .wb__seat {
    font-size: 9px;
  }
  .wb__ok {
    font-size: 8px;
  }
  .wb__cd {
    font-size: 9px;
  }
  .wb__cd-ic svg {
    width: 12px;
    height: 12px;
  }
  .wb__clock {
    font-size: 11px;
  }
  .wb__go {
    padding: 4px 8px;
    font-size: 10px;
  }
  .wb__msg {
    min-height: 0;
    font-size: 9px;
  }
}

// 실제 동작: 회차는 radiogroup 이라 클릭·좌우 방향키로 고른다(aria-checked 로 상태를 알린다). setInterval 이 1초마다
// 남은 시간을 줄여 숫자 띠를 --d 만큼 올리고, 예약 버튼은 고른 회차에 확정 배지를 내려앉힌다.
var stage = document.querySelector('.stage');
var slots = [].slice.call(document.querySelectorAll('.wb__slot'));
var book = document.getElementById('wb-go');
var msg = document.getElementById('wb-msg');
var srText = document.getElementById('wb-cdt');
var mm = document.getElementById('wb-mm'), d1 = document.getElementById('wb-d1'), d0 = document.getElementById('wb-d0');
var left = 14 * 60 + 32, picked = 0, booked = -1;
function human() { stage.classList.remove('is-demo'); }
function tick() {
  var m = Math.floor(left / 60), s = left % 60;
  mm.textContent = m < 10 ? '0' + m : '' + m;
  d1.style.setProperty('--d', Math.floor(s / 10));
  d0.style.setProperty('--d', s % 10);
  srText.textContent = m + ' min ' + s + ' sec left';
}
function pick(i) {
  picked = i;
  slots.forEach(function (b, j) {
    b.setAttribute('aria-checked', j === i ? 'true' : 'false');
    b.tabIndex = j === i ? 0 : -1;
  });
  slots[i].focus({ preventScroll: true });
}
slots.forEach(function (b, i) { b.addEventListener('click', function () { human(); pick(i); }); });
document.getElementById('wb-slots').addEventListener('keydown', function (e) {
  if (e.key !== 'ArrowRight' && e.key !== 'ArrowLeft') return;
  e.preventDefault(); human();
  var n = picked, step = e.key === 'ArrowRight' ? 1 : slots.length - 1;
  do { n = (n + step) % slots.length; } while (slots[n].disabled && n !== picked);
  pick(n);
});
book.addEventListener('click', function () {
  human();
  if (booked === picked) { msg.textContent = 'You\'ve already booked this one'; return; }
  booked = picked;
  slots.forEach(function (b) { b.classList.remove('is-ok'); });
  slots[picked].classList.add('is-ok');
  msg.textContent = slots[picked].dataset.t + ' session booked. A confirmation email is on its way';
});
setInterval(function () { if (left > 0) { left--; tick(); } }, 1000);
tick();
stage.addEventListener('pointerdown', human, { once: true });
window.addEventListener('keydown', human, { once: true });

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

export type WebinarSlotBookingProps = {
  /** 격자 미리보기용 루프 길이(ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type DigitVars = CSSProperties & { "--d"?: number };
type KeyEvt = { key: string; preventDefault(): void };
type Box<T> = { current: T };

const sessions = [
  { day: "목 20:00", seats: "8석 남음", closed: false },
  { day: "금 11:00", seats: "24석", closed: false },
  { day: "금 20:00", seats: "마감", closed: true },
];

function CalendarBlank() {
  return (
    <svg viewBox="0 0 256 256" width="16" height="16" aria-hidden="true">
      <g fill="currentColor">
        <path d="M216 48v40H40V48a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2" />
        <path d="M208 32h-24v-8a8 8 0 0 0-16 0v8H88v-8a8 8 0 0 0-16 0v8H48a16 16 0 0 0-16 16v160a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V48a16 16 0 0 0-16-16M72 48v8a8 8 0 0 0 16 0v-8h80v8a8 8 0 0 0 16 0v-8h24v32H48V48Zm136 160H48V96h160z" />
      </g>
    </svg>
  );
}

function Clock() {
  return (
    <svg viewBox="0 0 256 256" width="14" height="14" aria-hidden="true">
      <g fill="currentColor">
        <path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2" />
        <path d="M128 24a104 104 0 1 0 104 104A104.11 104.11 0 0 0 128 24m0 192a88 88 0 1 1 88-88a88.1 88.1 0 0 1-88 88m64-88a8 8 0 0 1-8 8h-56a8 8 0 0 1-8-8V72a8 8 0 0 1 16 0v48h48a8 8 0 0 1 8 8" />
      </g>
    </svg>
  );
}

function Digit({ value, strip }: { value: number; strip?: boolean }) {
  const v: DigitVars = { "--d": value };
  return (
    <span className={[styles.wb__d, strip ? styles["wb__d--s1"] : ""].filter(Boolean).join(" ")} style={v}>
      <span className={styles.wb__strip}>
        {[0, 1, 2, 3, 4, 5, 6, 7, 8, 9].map((d) => (
          <b key={d}>{d}</b>
        ))}
      </span>
    </span>
  );
}

export default function WebinarSlotBooking({
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
}: WebinarSlotBookingProps) {
  const [picked, setPicked] = useState(0);
  const [confirmed, setConfirmed] = useState(-1);
  const [remain, setRemain] = useState(14 * 60 + 32);
  const [msg, setMsg] = useState("회차를 고르면 자리를 잡아 둬요");
  const [loop, setLoop] = useState(true);
  const cellRefs = useRef<(HTMLButtonElement | null)[]>([]) as Box<(HTMLButtonElement | null)[]>;

  // setInterval 이 1초마다 남은 시간을 줄이고, 그 값이 숫자 띠의 --d 로 들어간다
  useEffect(() => {
    const id = setInterval(() => setRemain((p) => (p > 0 ? p - 1 : 0)), 1000);
    return () => clearInterval(id);
  }, []);

  function select(i: number) {
    setLoop(false);
    setPicked(i);
    const el = cellRefs.current[i];
    if (el) el.focus({ preventScroll: true });
  }

  function onKey(e: KeyEvt) {
    if (e.key !== "ArrowRight" && e.key !== "ArrowLeft") return;
    e.preventDefault();
    const step = e.key === "ArrowRight" ? 1 : sessions.length - 1;
    let n = picked;
    do {
      n = (n + step) % sessions.length;
    } while (sessions[n].closed && n !== picked);
    select(n);
  }

  function book() {
    setLoop(false);
    if (confirmed === picked) {
      setMsg("이미 예약한 회차예요");
      return;
    }
    setConfirmed(picked);
    setMsg(`${sessions[picked].day} 회차로 예약했습니다. 확인 메일을 보냈어요`);
  }

  const m = Math.floor(remain / 60);
  const s = remain % 60;
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const cls = [styles.wb, loop ? styles["is-demo"] : ""].filter(Boolean).join(" ");

  return (
    <section className={cls} style={vars}>
      <p className={styles.wb__title}>
        <span className={styles["wb__title-ic"]} aria-hidden="true"><CalendarBlank /></span>
        웨비나 회차 고르기
      </p>
      <div className={styles.wb__slots} role="radiogroup" aria-label="웨비나 회차" onKeyDown={onKey}>
        {sessions.map((se, i) => (
          <button
            key={se.day}
            ref={(el: HTMLButtonElement | null) => {
              cellRefs.current[i] = el;
            }}
            className={[styles.wb__slot, confirmed === i ? styles["is-ok"] : ""].filter(Boolean).join(" ")}
            type="button"
            role="radio"
            aria-checked={picked === i}
            tabIndex={picked === i ? 0 : -1}
            disabled={se.closed}
            onClick={() => select(i)}
          >
            <span className={styles.wb__ring} aria-hidden="true" />
            <span className={styles.wb__day}>{se.day}</span>
            <span className={[styles.wb__seat, se.closed ? styles["wb__seat--closed"] : ""].filter(Boolean).join(" ")}>
              {se.seats}
            </span>
            <span className={styles.wb__ok} aria-hidden="true">
              <svg className={styles["wb__ok-ic"]} viewBox="0 0 24 24" width="10" height="10">
                <polyline points="4 12 9 17 20 6" fill="none" stroke="currentColor" strokeWidth={3} strokeLinecap="round" strokeLinejoin="round" />
              </svg>
              확정됨
            </span>
          </button>
        ))}
      </div>
      <p className={styles.wb__cd} role="timer" aria-live="off">
        <span className={styles["wb__cd-ic"]} aria-hidden="true"><Clock /></span>
        선택 회차 마감까지
        <span className={styles.wb__clock} aria-hidden="true">
          <b className={styles.wb__mm}>{m < 10 ? `0${m}` : m}</b>:
          <Digit value={Math.floor(s / 10)} />
          <Digit value={s % 10} strip />
        </span>
        <span className={styles["sr-only"]}>{`${m}분 ${s}초 남음`}</span>
      </p>
      <button className={styles.wb__go} type="button" onClick={book}>이 회차로 예약하기</button>
      <p className={styles.wb__msg} role="status" aria-live="polite">{msg}</p>
    </section>
  );
}