09Notification badge

<main class="stage">
  <button class="bell is-demo" type="button" aria-label="3 notifications">
    <svg viewBox="0 0 24 24" width="32" height="32" aria-hidden="true">
      <g class="bell__body">
        <path d="M12 3a5 5 0 0 0-5 5v3.2c0 .9-.35 1.77-.98 2.4L5 15h14l-1.02-1.4a3.4 3.4 0 0 1-.98-2.4V8a5 5 0 0 0-5-5Z" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linejoin="round"/>
        <path d="M10 18a2 2 0 0 0 4 0" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/>
      </g>
    </svg>
    <span class="badge" aria-hidden="true">3</span>
  </button>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-base;    // 300ms — 종이 흔들리는 시간
$easing: $ease-out;
$color: $subject-blue;   // 배지 색

// ── 데모 무대 ───────────────────────────────
@include stage($stage-ink);

.bell {
  position: relative;
  display: grid; place-items: center;
  width: 56px; height: 56px;
  border: 0; border-radius: $r-control;
  background: transparent;
  color: $subject-cream;
  cursor: pointer;

  &:hover, &:focus-visible { background: rgba(255, 255, 255, .08); }
}
.bell__body {
  transform-box: fill-box;
  transform-origin: 50% 0%;      // 종의 꼭지점을 축으로 흔든다
}
.badge {
  position: absolute; top: $sp-1; right: $sp-1;
  display: grid; place-items: center;
  min-width: 18px; height: 18px;
  padding: 0 $sp-1;
  border-radius: $r-pill;
  background: $color;
  color: #fff;
  font-weight: 700;
  font-size: 10px;
  line-height: 1;
  font-family: inherit;
}

// 실측 2026-09-10: 흔들림과 배지 맥동을 같은 구간에 겹쳐 "새 알림이 왔다"는 한 순간을 만든다
.bell.is-demo .bell__body { animation: shake $dur-loop $easing infinite; }
.bell.is-demo .badge       { animation: pulse $dur-loop $easing infinite; }

@keyframes shake {
  0%, 55%, 100% { transform: rotate(0deg); }
  60% { transform: rotate(-14deg); }
  65% { transform: rotate(12deg); }
  70% { transform: rotate(-8deg); }
  75% { transform: rotate(5deg); }
  80% { transform: rotate(0deg); }
}
@keyframes pulse {
  0%, 55%, 100% { transform: scale(1); }
  60% { transform: scale(1.3); }
  70% { transform: scale(1); }
}

// ── 접근성: 움직임 줄이기 설정이면 흔들지 않고 배지만 남긴다 ────────
@media (prefers-reduced-motion: reduce) {
  .bell.is-demo .bell__body { animation: none; }
  .bell.is-demo .badge       { animation: none; }
}

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 {
  position: relative;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: #fff7e6;
  cursor: pointer;
}
.bell:hover, .bell:focus-visible {
  background: rgba(255, 255, 255, 0.08);
}

.bell__body {
  transform-box: fill-box;
  transform-origin: 50% 0%;
}

.badge {
  position: absolute;
  top: 4px;
  right: 4px;
  display: grid;
  place-items: center;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 999px;
  background: #2f6df6;
  color: #fff;
  font-weight: 700;
  font-size: 10px;
  line-height: 1;
  font-family: inherit;
}

.bell.is-demo .bell__body {
  animation: shake 2s ease-out infinite;
}

.bell.is-demo .badge {
  animation: pulse 2s ease-out infinite;
}

@keyframes shake {
  0%, 55%, 100% {
    transform: rotate(0deg);
  }
  60% {
    transform: rotate(-14deg);
  }
  65% {
    transform: rotate(12deg);
  }
  70% {
    transform: rotate(-8deg);
  }
  75% {
    transform: rotate(5deg);
  }
  80% {
    transform: rotate(0deg);
  }
}
@keyframes pulse {
  0%, 55%, 100% {
    transform: scale(1);
  }
  60% {
    transform: scale(1.3);
  }
  70% {
    transform: scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .bell.is-demo .bell__body {
    animation: none;
  }
  .bell.is-demo .badge {
    animation: none;
  }
}

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

export type BellBadgeProps = {
  count: number;
  onClick?: () => void;
  color?: string;
};

type Vars = CSSProperties & { "--color"?: string };

export default function BellBadge({ count, onClick, color = "#2f6df6" }: BellBadgeProps) {
  const vars: Vars = { "--color": color };

  return (
    <button className={styles.bell} style={vars} type="button" aria-label={`알림 ${count}개`} onClick={onClick}>
      <svg viewBox="0 0 24 24" width={32} height={32} aria-hidden="true">
        <g className={styles.body}>
          <path
            d="M12 3a5 5 0 0 0-5 5v3.2c0 .9-.35 1.77-.98 2.4L5 15h14l-1.02-1.4a3.4 3.4 0 0 1-.98-2.4V8a5 5 0 0 0-5-5Z"
            fill="none"
            stroke="currentColor"
            strokeWidth={1.8}
            strokeLinejoin="round"
          />
          <path d="M10 18a2 2 0 0 0 4 0" fill="none" stroke="currentColor" strokeWidth={1.8} strokeLinecap="round" />
        </g>
      </svg>
      {count > 0 && (
        <span className={styles.badge} aria-hidden="true">
          {count}
        </span>
      )}
    </button>
  );
}