08Kira sparkle flash

<main class="stage">
  <div class="badge o-kira">Recommended</div>
  <span class="tag">Sparkle</span>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1.8s;
$easing: ease-in-out;
$color: $subject-blue;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-paper);
.stage { position: relative; }

.badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: $sp-3 $sp-6;
  border-radius: $r-pill;
  background: $stage-ink;
  color: $subject-cream;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1;
  font-family: inherit;
  box-shadow: $shadow-raised;
}
// ── 실제 두 개의 ::before·::after 별을 서로 다른 delay 로 반짝인다 ─────
.badge::before,
.badge::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: $color;
  opacity: 0;
}
.badge::before { top: -5px; left: 8px; }
.badge::after  { bottom: -4px; right: 4px; }

.badge.o-kira::before { animation: o-kira $duration $easing infinite; }
.badge.o-kira::after  { animation: o-kira $duration $easing infinite; animation-delay: .4s; }

@keyframes o-kira {
  0%, 45%, 100% { opacity: 0; transform: scale(.4); }
  62%           { opacity: 1; transform: scale(1.3); }
  78%           { opacity: 0; transform: scale(.6); }
}

.tag {
  position: absolute;
  top: $sp-4;
  right: $sp-4;
  padding: $sp-1 $sp-3;
  border-radius: $r-sm;
  background: rgba(23, 20, 26, .08);
  color: $stage-ink;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: .04em;
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .badge.o-kira::before, .badge.o-kira::after { animation: none; }
}

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

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

.stage {
  position: relative;
}

.badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.badge::before,
.badge::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #2f6df6;
  opacity: 0;
}

.badge::before {
  top: -5px;
  left: 8px;
}

.badge::after {
  bottom: -4px;
  right: 4px;
}

.badge.o-kira::before {
  animation: o-kira 1.8s ease-in-out infinite;
}

.badge.o-kira::after {
  animation: o-kira 1.8s ease-in-out infinite;
  animation-delay: 0.4s;
}

@keyframes o-kira {
  0%, 45%, 100% {
    opacity: 0;
    transform: scale(0.4);
  }
  62% {
    opacity: 1;
    transform: scale(1.3);
  }
  78% {
    opacity: 0;
    transform: scale(0.6);
  }
}
.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.08);
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}

@media (prefers-reduced-motion: reduce) {
  .badge.o-kira::before, .badge.o-kira::after {
    animation: none;
  }
}

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

export type SparkleBadgeProps = {
  children: ReactNode;
  /** 한 번 반짝이는 주기 (기본 1800ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function SparkleBadge({
  children,
  duration = 1800,
  easing = "ease-in-out",
  color = "#2f6df6",
}: SparkleBadgeProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.badge} style={vars}>
      {children}
    </div>
  );
}