09既読が生きている通知バッジメニュー

<main class="stage">
  <section class="frame is-demo" id="nbf" aria-label="クラブ">
    <div class="page">
      <header class="bar">
        <p class="brand">クラブ</p>
        <button class="bell" id="nbf-bell" type="button" aria-label="通知" aria-controls="nbf-panel">
          <svg viewBox="0 0 256 256" width="18" height="18" aria-hidden="true"><g fill="currentColor"><path d="M208 192H48a8 8 0 0 1-6.88-12C47.71 168.6 56 139.81 56 104a72 72 0 0 1 144 0c0 35.82 8.3 64.6 14.9 76a8 8 0 0 1-6.9 12" opacity=".2"/><path d="M221.8 175.94c-5.55-9.56-13.8-36.61-13.8-71.94a80 80 0 1 0-160 0c0 35.34-8.26 62.38-13.81 71.94A16 16 0 0 0 48 200h40.81a40 40 0 0 0 78.38 0H208a16 16 0 0 0 13.8-24.06M128 216a24 24 0 0 1-22.62-16h45.24A24 24 0 0 1 128 216m-80-32c7.7-13.24 16-43.92 16-80a64 64 0 1 1 128 0c0 36.05 8.28 66.73 16 80Z"/></g></svg>
          <span class="badge" id="nbf-badge" data-n="3" aria-hidden="true"><span class="n3">3</span><span class="n2">2</span><span class="n1">1</span></span>
        </button>
      </header>
      <div class="body">
        <p class="skeleton" aria-hidden="true"></p>
        <p class="skeleton skeleton--short" aria-hidden="true"></p>
      </div>
    </div>
    <aside class="panel" id="nbf-panel" aria-label="通知" aria-hidden="true">
      <header class="phead">
        <p class="ptitle">通知</p>
        <button class="allbtn" id="nbf-all" type="button">
          <svg viewBox="0 0 256 256" width="18" height="18" 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>
          <span>すべて既読にする</span>
        </button>
      </header>
      <ul class="rows">
        <li><button class="row" type="button"><span class="dot" aria-hidden="true"></span><span class="rt">注文が出荷を始めました</span><span class="rtime">たった今</span></button></li>
        <li><button class="row" type="button"><span class="dot" aria-hidden="true"></span><span class="rt">クーポン2枚がまもなく失効します</span><span class="rtime">2時間前</span></button></li>
        <li><button class="row" type="button"><span class="dot" aria-hidden="true"></span><span class="rt">新しいコメントが付きました</span><span class="rtime">昨日</span></button></li>
      </ul>
    </aside>
    <p class="sr" id="nbf-live" aria-live="polite" data-fmt="未読の通知{n}件">未読の通知3件</p>
  </section>
</main>

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

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

@include stage($stage-ink);

$ink: $subject-ink;
$cream: $subject-cream;
$line: rgba(255, 247, 230, .16);
$hover: rgba(23, 20, 26, .06);

// ── 프레임: 잉크 무대 위 어두운 카드 ────────────────
.frame {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: min(420px, 94vw);
  height: min(260px, 84vh);
  border: 1px solid $line;
  border-radius: $r-card;
  background: rgba(255, 247, 230, .04);
  color: $cream;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.35;
}
.frame, .frame * { box-sizing: border-box; }

.page { display: flex; flex-direction: column; height: 100%; }

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: $sp-2 $sp-3;
}
.brand { margin: 0; font-size: 14px; font-weight: 700; letter-spacing: .02em; }

.bell {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin: 0;
  padding: 0;
  border: 1px solid $line;
  border-radius: $r-control;
  background: transparent;
  color: $cream;
  cursor: pointer;
}
.bell:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

// 배지 — 숫자는 겹친 span 을 컷으로 갈아끼운다 (transition 없음, 크로스페이드 금지)
.badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 18px;
  height: 18px;
  border-radius: $r-pill;
  background: $color;
  color: $ink;
}
.badge span {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  opacity: 0;
}
.badge[data-n="3"] .n3,
.badge[data-n="2"] .n2,
.badge[data-n="1"] .n1 { opacity: 1; }
.frame.is-clear .badge { opacity: 0; transform: scale(0); }

// 본문 흉내 — 회색 막대
.body {
  display: grid;
  align-content: start;
  gap: $sp-2;
  padding: 0 $sp-3 $sp-3;
}
.skeleton {
  height: 10px;
  margin: 0;
  border-radius: $r-pill;
  background: rgba(255, 247, 230, .10);
}
.skeleton--short { width: 62%; }

// ── 알림 패널 — 종 아래 오른쪽 정렬 ─────────────────
.panel {
  position: absolute;                 // 프레임 안에 완전히 들어간다
  top: 52px;
  right: $sp-3;
  width: min(240px, 84vw);
  padding: $sp-2;
  border-radius: $r-card;
  background: $cream;
  color: $ink;
  box-shadow: $shadow-raised;
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity $dur-quick $easing, transform $dur-quick $easing;
}
.frame.is-open .panel { opacity: 1; transform: translateY(0); pointer-events: auto; }

.phead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 $sp-1;
}
.ptitle { margin: 0; font-size: 12px; font-weight: 700; line-height: 1.3; }
.allbtn {
  display: inline-flex;
  align-items: center;
  gap: $sp-1;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: rgba(23, 20, 26, .55);
  font-family: inherit;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: underline;
  cursor: pointer;
}
.allbtn:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

.rows { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.row {
  display: grid;
  grid-template-columns: 8px 1fr;
  column-gap: $sp-2;
  align-items: start;
  width: 100%;
  margin: 0;
  padding: $sp-1;
  border: 0;
  border-radius: $r-control;
  background: transparent;
  color: inherit;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
}
.row:hover { background: $hover; }
.row:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.dot {
  grid-column: 1;
  grid-row: 1;
  width: 8px;
  height: 8px;
  margin-top: 4px;
  border-radius: 50%;
  background: $color;
}
.rt { grid-column: 2; grid-row: 1; font-size: 12px; font-weight: 600; line-height: 1.3; }
.rtime { grid-column: 2; grid-row: 2; font-size: 10px; line-height: 1.3; color: rgba(23, 20, 26, .5); }

// 읽음 — 점 소멸과 줄 어둡게짐은 컷으로 바뀐다 (transition 없음)
.row.is-read { opacity: .5; }
.row.is-read .dot { opacity: 0; transform: scale(0); }

// 화면 밖 스크린리더 영역 — 배지 수를 소리로 알린다
.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

// ── 격자 미리보기 전용 2초 루프 ─────────────────────
// 0-8% 닫힘 → 10% 패널 등장 → 34/48/62% 줄 하나씩 읽음(점 컷 소멸 + 배지 3→2→1→소멸) →
// 78% 유지 → 80-88% 짧은 닫힘. 읽음 처리 컷이 주인공이라 닫힘은 8% 안에 끝낸다.
@keyframes nbf-press {
  0%, 4% { transform: translateY(0); }
  6% { transform: translateY(2px); }
  8%, 100% { transform: translateY(0); }
}
@keyframes nbf-panel-cut {
  0%, 8.3% { opacity: 0; }
  8.4%, 100% { opacity: 1; }
}
@keyframes nbf-panel-rise {
  0%, 8.3% { transform: translateY(0); clip-path: inset(0 0 100% 0); }
  8.4%, 84% { transform: translateY(0); clip-path: inset(0 0 0 0); }
  90%, 100% { transform: translateY(0); clip-path: inset(100% 0 0 0); }
}
@keyframes nbf-dim1 { 0%, 34% { opacity: 1; } 34.1%, 100% { opacity: .5; } }
@keyframes nbf-dim2 { 0%, 48% { opacity: 1; } 48.1%, 100% { opacity: .5; } }
@keyframes nbf-dim3 { 0%, 62% { opacity: 1; } 62.1%, 100% { opacity: .5; } }
@keyframes nbf-dot1 { 0%, 34% { opacity: 1; transform: scale(1); } 34.1%, 100% { opacity: 0; transform: scale(0); } }
@keyframes nbf-dot2 { 0%, 48% { opacity: 1; transform: scale(1); } 48.1%, 100% { opacity: 0; transform: scale(0); } }
@keyframes nbf-dot3 { 0%, 62% { opacity: 1; transform: scale(1); } 62.1%, 100% { opacity: 0; transform: scale(0); } }
@keyframes nbf-n3 { 0%, 34% { opacity: 1; } 34.1%, 100% { opacity: 0; } }
@keyframes nbf-n2 { 0%, 34% { opacity: 0; } 34.1%, 48% { opacity: 1; } 48.1%, 100% { opacity: 0; } }
@keyframes nbf-n1 { 0%, 48% { opacity: 0; } 48.1%, 62% { opacity: 1; } 62.1%, 100% { opacity: 0; } }
@keyframes nbf-badge {
  0%, 62% { opacity: 1; transform: scale(1); }
  62.1%, 100% { opacity: 0; transform: scale(0); }
}

.frame.is-demo {
  .bell {
    animation-name: nbf-press;
    animation-duration: $duration;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .panel {
    animation-name: nbf-panel-cut, nbf-panel-rise;
    animation-duration: $duration, $duration;
    animation-timing-function: steps(1, end), $easing;
    animation-iteration-count: infinite, infinite;
  }
  .badge {
    animation-name: nbf-badge;
    animation-duration: $duration;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .badge .n3 { animation-name: nbf-n3; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .badge .n2 { animation-name: nbf-n2; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .badge .n1 { animation-name: nbf-n1; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .rows li:nth-child(1) .row { animation-name: nbf-dim1; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .rows li:nth-child(1) .dot { animation-name: nbf-dot1; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .rows li:nth-child(2) .row { animation-name: nbf-dim2; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .rows li:nth-child(2) .dot { animation-name: nbf-dot2; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .rows li:nth-child(3) .row { animation-name: nbf-dim3; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
  .rows li:nth-child(3) .dot { animation-name: nbf-dot3; animation-duration: $duration; animation-timing-function: steps(1, end); animation-iteration-count: infinite; }
}

@media (max-width: 340px) {
  .bar { padding: $sp-1 $sp-2; }
  .brand { font-size: 13px; }
  .panel { top: 44px; width: min(216px, 84vw); padding: $sp-1; }
  .phead { margin-bottom: 0; }
  .ptitle { font-size: 11px; }
  .row { padding: 0; column-gap: $sp-1; }
  .rt { font-size: 11px; line-height: 1.25; }
  .rtime { font-size: 10px; line-height: 1.2; }
  .body { gap: $sp-1; padding: 0 $sp-2 $sp-2; }
}

@media (prefers-reduced-motion: reduce) {
  .frame.is-demo .bell,
  .frame.is-demo .panel,
  .frame.is-demo .badge,
  .frame.is-demo .badge .n3,
  .frame.is-demo .badge .n2,
  .frame.is-demo .badge .n1,
  .frame.is-demo .rows li .row,
  .frame.is-demo .rows li .dot { animation: none !important; }
  // 움직임만 끄고 「열린 패널 + 안 읽은 알림 3개」 결과는 남긴다
  .frame.is-demo .panel { opacity: 1 !important; transform: none !important; }
}

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

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

.frame {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: min(420px, 94vw);
  height: min(260px, 84vh);
  border: 1px solid rgba(255, 247, 230, 0.16);
  border-radius: 16px;
  background: rgba(255, 247, 230, 0.04);
  color: #fff7e6;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.35;
}

.frame, .frame * {
  box-sizing: border-box;
}

.page {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
}

.brand {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.bell {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(255, 247, 230, 0.16);
  border-radius: 12px;
  background: transparent;
  color: #fff7e6;
  cursor: pointer;
}

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

.badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: #ffd23f;
  color: #17141a;
}

.badge span {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  opacity: 0;
}

.badge[data-n="3"] .n3,
.badge[data-n="2"] .n2,
.badge[data-n="1"] .n1 {
  opacity: 1;
}

.frame.is-clear .badge {
  opacity: 0;
  transform: scale(0);
}

.body {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 0 12px 12px;
}

.skeleton {
  height: 10px;
  margin: 0;
  border-radius: 999px;
  background: rgba(255, 247, 230, 0.1);
}

.skeleton--short {
  width: 62%;
}

.panel {
  position: absolute;
  top: 52px;
  right: 12px;
  width: min(240px, 84vw);
  padding: 8px;
  border-radius: 16px;
  background: #fff7e6;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 220ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.frame.is-open .panel {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.phead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 4px;
}

.ptitle {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
}

.allbtn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: rgba(23, 20, 26, 0.55);
  font-family: inherit;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: underline;
  cursor: pointer;
}

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

.rows {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.row {
  display: grid;
  grid-template-columns: 8px 1fr;
  column-gap: 8px;
  align-items: start;
  width: 100%;
  margin: 0;
  padding: 4px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: inherit;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
}

.row:hover {
  background: rgba(23, 20, 26, 0.06);
}

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

.dot {
  grid-column: 1;
  grid-row: 1;
  width: 8px;
  height: 8px;
  margin-top: 4px;
  border-radius: 50%;
  background: #ffd23f;
}

.rt {
  grid-column: 2;
  grid-row: 1;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.3;
}

.rtime {
  grid-column: 2;
  grid-row: 2;
  font-size: 10px;
  line-height: 1.3;
  color: rgba(23, 20, 26, 0.5);
}

.row.is-read {
  opacity: 0.5;
}

.row.is-read .dot {
  opacity: 0;
  transform: scale(0);
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@keyframes nbf-press {
  0%, 4% {
    transform: translateY(0);
  }
  6% {
    transform: translateY(2px);
  }
  8%, 100% {
    transform: translateY(0);
  }
}
@keyframes nbf-panel-cut {
  0%, 8.3% {
    opacity: 0;
  }
  8.4%, 100% {
    opacity: 1;
  }
}
@keyframes nbf-panel-rise {
  0%, 8.3% {
    transform: translateY(0);
    clip-path: inset(0 0 100% 0);
  }
  8.4%, 84% {
    transform: translateY(0);
    clip-path: inset(0 0 0 0);
  }
  90%, 100% {
    transform: translateY(0);
    clip-path: inset(100% 0 0 0);
  }
}
@keyframes nbf-dim1 {
  0%, 34% {
    opacity: 1;
  }
  34.1%, 100% {
    opacity: 0.5;
  }
}
@keyframes nbf-dim2 {
  0%, 48% {
    opacity: 1;
  }
  48.1%, 100% {
    opacity: 0.5;
  }
}
@keyframes nbf-dim3 {
  0%, 62% {
    opacity: 1;
  }
  62.1%, 100% {
    opacity: 0.5;
  }
}
@keyframes nbf-dot1 {
  0%, 34% {
    opacity: 1;
    transform: scale(1);
  }
  34.1%, 100% {
    opacity: 0;
    transform: scale(0);
  }
}
@keyframes nbf-dot2 {
  0%, 48% {
    opacity: 1;
    transform: scale(1);
  }
  48.1%, 100% {
    opacity: 0;
    transform: scale(0);
  }
}
@keyframes nbf-dot3 {
  0%, 62% {
    opacity: 1;
    transform: scale(1);
  }
  62.1%, 100% {
    opacity: 0;
    transform: scale(0);
  }
}
@keyframes nbf-n3 {
  0%, 34% {
    opacity: 1;
  }
  34.1%, 100% {
    opacity: 0;
  }
}
@keyframes nbf-n2 {
  0%, 34% {
    opacity: 0;
  }
  34.1%, 48% {
    opacity: 1;
  }
  48.1%, 100% {
    opacity: 0;
  }
}
@keyframes nbf-n1 {
  0%, 48% {
    opacity: 0;
  }
  48.1%, 62% {
    opacity: 1;
  }
  62.1%, 100% {
    opacity: 0;
  }
}
@keyframes nbf-badge {
  0%, 62% {
    opacity: 1;
    transform: scale(1);
  }
  62.1%, 100% {
    opacity: 0;
    transform: scale(0);
  }
}
.frame.is-demo .bell {
  animation-name: nbf-press;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.frame.is-demo .panel {
  animation-name: nbf-panel-cut, nbf-panel-rise;
  animation-duration: 2s, 2s;
  animation-timing-function: steps(1, end), cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite, infinite;
}
.frame.is-demo .badge {
  animation-name: nbf-badge;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .badge .n3 {
  animation-name: nbf-n3;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .badge .n2 {
  animation-name: nbf-n2;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .badge .n1 {
  animation-name: nbf-n1;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .rows li:nth-child(1) .row {
  animation-name: nbf-dim1;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .rows li:nth-child(1) .dot {
  animation-name: nbf-dot1;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .rows li:nth-child(2) .row {
  animation-name: nbf-dim2;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .rows li:nth-child(2) .dot {
  animation-name: nbf-dot2;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .rows li:nth-child(3) .row {
  animation-name: nbf-dim3;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.frame.is-demo .rows li:nth-child(3) .dot {
  animation-name: nbf-dot3;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@media (max-width: 340px) {
  .bar {
    padding: 4px 8px;
  }
  .brand {
    font-size: 13px;
  }
  .panel {
    top: 44px;
    width: min(216px, 84vw);
    padding: 4px;
  }
  .phead {
    margin-bottom: 0;
  }
  .ptitle {
    font-size: 11px;
  }
  .row {
    padding: 0;
    column-gap: 4px;
  }
  .rt {
    font-size: 11px;
    line-height: 1.25;
  }
  .rtime {
    font-size: 10px;
    line-height: 1.2;
  }
  .body {
    gap: 4px;
    padding: 0 8px 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .frame.is-demo .bell,
  .frame.is-demo .panel,
  .frame.is-demo .badge,
  .frame.is-demo .badge .n3,
  .frame.is-demo .badge .n2,
  .frame.is-demo .badge .n1,
  .frame.is-demo .rows li .row,
  .frame.is-demo .rows li .dot {
    animation: none !important;
  }
  .frame.is-demo .panel {
    opacity: 1 !important;
    transform: none !important;
  }
}

// 실제 동작: 줄을 누르면 그 줄만 읽음이 되고 배지 숫자가 줄어든다. 화면 밖 aria-live 영역이 수를 갱신한다.
var root = document.getElementById('nbf');
var bell = document.getElementById('nbf-bell');
var panel = document.getElementById('nbf-panel');
var live = document.getElementById('nbf-live');
var badge = document.getElementById('nbf-badge');
var allBtn = document.getElementById('nbf-all');
var rows = Array.prototype.slice.call(root.querySelectorAll('.row'));
bell.setAttribute('aria-haspopup', 'true');
bell.setAttribute('aria-expanded', 'false');
panel.inert = true;                                   // 닫힌 동안 패널 안 버튼은 탭 순서에서 빠진다
function unread() {
  return rows.filter(function (r) { return !r.classList.contains('is-read'); });
}
function sync() {
  root.classList.remove('is-demo');                   // 첫 조작에서 격자 루프를 끈다
  var n = unread().length;
  root.classList.toggle('is-clear', n === 0);
  badge.setAttribute('data-n', String(n));
  live.textContent = live.dataset.fmt.replace('{n}', String(n));  // 문구는 data-fmt 템플릿에서 — JS 에 하드코딩하면 언어팩을 못 탄다
}
function setOpen(on) {
  root.classList.remove('is-demo');
  root.classList.toggle('is-open', on);
  bell.setAttribute('aria-expanded', on ? 'true' : 'false');
  panel.setAttribute('aria-hidden', on ? 'false' : 'true');
  panel.inert = !on;
  var hit = unread();
  (on ? (hit.length ? hit[0] : rows[0]) : bell).focus({ preventScroll: true });
}
bell.addEventListener('click', function () { setOpen(!root.classList.contains('is-open')); });
allBtn.addEventListener('click', function () {
  rows.forEach(function (r) { r.classList.add('is-read'); });
  sync();
});
rows.forEach(function (r) {
  r.addEventListener('click', function () { r.classList.add('is-read'); sync(); });
});
document.addEventListener('keydown', function (e) {
  if (e.key === 'Escape' && root.classList.contains('is-open')) setOpen(false);
});

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

export type NotificationBellLabels = {
  brand: string;
  bellLabel: string;
  panelTitle: string;
  markAll: string;
  unreadText: string;
  items: Array<{ title: string; time: string }>;
};

export type NotificationBellProps = {
  labels?: Partial<NotificationBellLabels>;
  /** 격자 미리보기용 2초 자동 루프. 사람이 손대면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
// ambient 가 얇아 이벤트 제네릭을 못 쓴다 — 필요한 꼴만 로컬 타입으로 선언
type KeyEvt = { key: string; preventDefault(): void };
type Focusable = { focus: (o: { preventScroll: boolean }) => void };
type PanelEl = { inert?: boolean };
type Box<T> = { current: T | null };

const defaults: NotificationBellLabels = {
  brand: "Club",
  bellLabel: "Notifications",
  panelTitle: "Notifications",
  markAll: "Mark all as read",
  unreadText: "{n} unread",
  items: [
    { title: "Your order started shipping", time: "just now" },
    { title: "2 coupons expiring soon", time: "2 hours ago" },
    { title: "New comment posted", time: "yesterday" },
  ],
};

function BellIcon() {
  return (
    <svg viewBox="0 0 256 256" width="18" height="18" aria-hidden="true"><g fill="currentColor"><path d="M208 192H48a8 8 0 0 1-6.88-12C47.71 168.6 56 139.81 56 104a72 72 0 0 1 144 0c0 35.82 8.3 64.6 14.9 76a8 8 0 0 1-6.9 12" opacity=".2"/><path d="M221.8 175.94c-5.55-9.56-13.8-36.61-13.8-71.94a80 80 0 1 0-160 0c0 35.34-8.26 62.38-13.81 71.94A16 16 0 0 0 48 200h40.81a40 40 0 0 0 78.38 0H208a16 16 0 0 0 13.8-24.06M128 216a24 24 0 0 1-22.62-16h45.24A24 24 0 0 1 128 216m-80-32c7.7-13.24 16-43.92 16-80a64 64 0 1 1 128 0c0 36.05 8.28 66.73 16 80Z"/></g></svg>
  );
}

function CheckIcon() {
  return (
    <svg viewBox="0 0 256 256" width="18" height="18" 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 NotificationBell({
  labels,
  demo = true,
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#ffd23f",
}: NotificationBellProps) {
  const L = { ...defaults, ...labels };
  const [open, setOpen] = useState(false);
  const [live, setLive] = useState(demo);
  const [read, setRead] = useState<boolean[]>(L.items.map(() => false));
  const bellRef = useRef<Focusable | null>(null);
  const panelRef = useRef<PanelEl | null>(null);
  const rowRefs = useRef<Array<Focusable | null>>([]);

  // 닫힌 동안 패널 안 버튼은 탭 순서에서 빠진다 (inert)
  useEffect(() => { if (panelRef.current) panelRef.current.inert = !open; }, [open]);

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

  const unread = read.filter((r) => !r).length;

  function firstUnread() {
    const rows = rowRefs.current;                       // Box 배열 ref null 가드
    if (!rows) return undefined;
    for (let j = 0; j < rows.length; j++) {
      if (!read[j] && rows[j]) return rows[j];
    }
    return rows[0];
  }

  function setBell(on: boolean) {
    setLive(false);
    setOpen(on);
    (on ? firstUnread() : bellRef.current)?.focus({ preventScroll: true });
  }

  function markRead(i: number) {
    setLive(false);
    setRead(read.map((r, j) => (j === i ? true : r)));
  }

  function markAll() {
    setLive(false);
    setRead(L.items.map(() => true));
  }

  function panelKeys(e: KeyEvt) {
    if (e.key === "Escape") setBell(false);
  }

  const cls = [styles.frame, live ? styles.isDemo : "", open ? styles.isOpen : "", unread === 0 ? styles.isClear : ""]
    .filter(Boolean)
    .join(" ");

  return (
    <section className={cls} style={vars} aria-label={L.brand}>
      <div className={styles.page}>
        <header className={styles.bar}>
          <p className={styles.brand}>{L.brand}</p>
          <button
            className={styles.bell}
            type="button"
            aria-label={L.bellLabel}
            aria-controls="nbf-panel"
            aria-haspopup="true"
            aria-expanded={open}
            onClick={() => setBell(!open)}
            ref={(el: Focusable | null) => { bellRef.current = el; }}
          >
            <BellIcon />
            <span className={styles.badge} data-n={String(unread)} aria-hidden="true">
              <span className={styles.n3}>3</span>
              <span className={styles.n2}>2</span>
              <span className={styles.n1}>1</span>
            </span>
          </button>
        </header>
        <div className={styles.body}>
          <p className={styles.skeleton} aria-hidden="true" />
          <p className={styles.skeletonShort} aria-hidden="true" />
        </div>
      </div>
      <aside
        className={styles.panel}
        id="nbf-panel"
        aria-label={L.panelTitle}
        aria-hidden={!open}
        onKeyDown={panelKeys}
        ref={(el: PanelEl | null) => { panelRef.current = el; }}
      >
        <header className={styles.phead}>
          <p className={styles.ptitle}>{L.panelTitle}</p>
          <button className={styles.allbtn} type="button" onClick={markAll}>
            <CheckIcon />
            <span>{L.markAll}</span>
          </button>
        </header>
        <ul className={styles.rows}>
          {L.items.map((it, i) => (
            <li key={it.title}>
              <button
                type="button"
                className={[styles.row, read[i] ? styles.isRead : ""].filter(Boolean).join(" ")}
                onClick={() => markRead(i)}
                ref={(el: Focusable | null) => { if (rowRefs.current) rowRefs.current[i] = el; }}
              >
                <span className={styles.dot} aria-hidden="true" />
                <span className={styles.rt}>{it.title}</span>
                <span className={styles.rtime}>{it.time}</span>
              </button>
            </li>
          ))}
        </ul>
      </aside>
      <p className={styles.sr} aria-live="polite">{L.unreadText.replace("{n}", String(unread))}</p>
    </section>
  );
}