07Flash

<main class="stage">
  <div class="notice">
    <span class="notice__dot a-flash" aria-hidden="true"></span>
    Urgent notice
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1s;
$easing: ease-in-out;
$color: $subject-cream;

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

.notice {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: $r-pill;
  background: rgba(255, 255, 255, .14);
  color: $subject-ink;                       // AA: 주황 면(흰 14% 겹침 #d2ada4) 위 6.28:1 — 알림 점은 크림 유지
  font-weight: 700; font-size: clamp(15px, 4vw, 18px); line-height: 1; font-family: inherit;
}
.notice__dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: $color;
  flex: none;
}

// ── .a-flash 는 opacity 만으로 두 번 끊어 깜빡인다. 요소는 사라지지 않는다 ─
.a-flash {
  animation: flash $duration $easing infinite;
}

@keyframes flash {
  0%, 50%, 100% { opacity: 1; }
  25%, 75%      { opacity: .15; }
}

@media (prefers-reduced-motion: reduce) {
  .a-flash { animation: none; }
}

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);
}

.notice {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  color: #17141a;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1;
  font-family: inherit;
}

.notice__dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff7e6;
  flex: none;
}

.a-flash {
  animation: flash 1s ease-in-out infinite;
}

@keyframes flash {
  0%, 50%, 100% {
    opacity: 1;
  }
  25%, 75% {
    opacity: 0.15;
  }
}
@media (prefers-reduced-motion: reduce) {
  .a-flash {
    animation: none;
  }
}

import type { CSSProperties, ReactNode } from "react";
import styles from "./FlashNotice.module.scss";

export type FlashNoticeProps = {
  children: ReactNode;
  /** 한 번 깜빡이는 데 걸리는 시간 (기본 1000ms) */
  duration?: number;
  /** CSS easing (기본 ease-in-out) */
  easing?: string;
  /** 점·글자 색 */
  color?: string;
};

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

export default function FlashNotice({
  children,
  duration = 1000,
  easing = "ease-in-out",
  color = "#fff7e6",
}: FlashNoticeProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.notice} style={vars}>
      <span className={styles.dot} aria-hidden="true" />
      {children}
    </div>
  );
}