06Notification count badge

<main class="stage is-demo">
  <div class="bell-wrap" aria-label="5 new notifications">
    <svg class="bell" viewBox="0 0 256 256" width="40" height="40" 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="count">5</span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;   // 2s — 흔들림+팝 한 주기
$easing: $ease-pop;
$color: $error;

@include stage($stage-ink);

.bell-wrap {
  position: relative;
  width: 64px; height: 64px;
  display: grid; place-items: center;
}

.bell {
  transform-origin: 50% 12%; // 규칙8: 종 꼭지점 흔들림
  color: $stage-yellow;   // Phosphor duotone: g fill="currentColor" 가 이 값을 물려받는다
}

.count {
  position: absolute;
  top: 2px; right: 0;
  min-width: $sp-4; height: $sp-4;
  border-radius: $r-pill;
  background: $color;
  color: #fff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 700;
  font-size: 11px;
  display: grid; place-items: center;
  padding: 0 $sp-1;
  box-shadow: 0 0 0 2px $stage-ink;
  transform: scale(0);
}

.stage.is-demo .bell {
  animation: shake $duration $easing infinite;
}

.stage.is-demo .count {
  animation: pop-in $duration $easing infinite;
}

@keyframes shake {
  0%, 55%, 100% { transform: rotate(0deg); }
  60% { transform: rotate(-12deg); }
  65% { transform: rotate(10deg); }
  70% { transform: rotate(-7deg); }
  75% { transform: rotate(4deg); }
  80% { transform: rotate(0deg); }
}

@keyframes pop-in {
  0%, 52% { transform: scale(0); }
  62% { transform: scale(1.15); }
  74%, 100% { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .bell { animation: none; }
  .stage.is-demo .count { animation: none; transform: scale(1); }
}

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);
}

.bell-wrap {
  position: relative;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
}

.bell {
  transform-origin: 50% 12%;
  color: #ffd23f;
}

.count {
  position: absolute;
  top: 2px;
  right: 0;
  min-width: 16px;
  height: 16px;
  border-radius: 999px;
  background: #c2361a;
  color: #fff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 700;
  font-size: 11px;
  display: grid;
  place-items: center;
  padding: 0 4px;
  box-shadow: 0 0 0 2px #17141a;
  transform: scale(0);
}

.stage.is-demo .bell {
  animation: shake 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.stage.is-demo .count {
  animation: pop-in 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes shake {
  0%, 55%, 100% {
    transform: rotate(0deg);
  }
  60% {
    transform: rotate(-12deg);
  }
  65% {
    transform: rotate(10deg);
  }
  70% {
    transform: rotate(-7deg);
  }
  75% {
    transform: rotate(4deg);
  }
  80% {
    transform: rotate(0deg);
  }
}
@keyframes pop-in {
  0%, 52% {
    transform: scale(0);
  }
  62% {
    transform: scale(1.15);
  }
  74%, 100% {
    transform: scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .bell {
    animation: none;
  }
  .stage.is-demo .count {
    animation: none;
    transform: scale(1);
  }
}

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

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

export default function BadgeCountNotification({
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#c2361a",
  count = 5,
}: BadgeCountNotificationProps) {
  const vars: CSSProperties = { "--duration": `${duration}ms`, "--easing": easing, "--color": color } as CSSProperties;
  return (
    <div className={styles.bellWrap} style={vars} aria-label={`${count} new notifications`}>
      <svg className={styles.bell} viewBox="0 0 256 256" width={40} height={40} 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 className={styles.count}>{count}</span>
    </div>
  );
}