09SCSS random()で疑似ランダム遅延

<main class="stage">
  <div class="badges is-demo">
    <span class="badge">人気</span>
    <span class="badge">新作</span>
    <span class="badge">セール</span>
    <span class="badge">数量限定</span>
    <span class="badge">ベスト</span>
  </div>
</main>

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

$duration: $dur-quick;                             // 배지 하나가 나타나는 시간
$easing: $ease-pop;                                // 톡 튀어 올라오는 느낌
$max-delay: 420;                                   // 랜덤 지연 상한(ms) — SCSS random() 이 컴파일 시점에 고정한다

@include stage($stage-ink);

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: min(380px, 90vw);
  font-weight: 700; font-size: clamp(11px, 3vw, 13px); line-height: 1.2; font-family: inherit;
}

.badge {
  padding: clamp(7px, 2.2vw, 9px) clamp(11px, 3vw, 14px);
  border-radius: $r-pill;
  background: $subject-cream;
  color: $stage-ink;
  box-shadow: $shadow-raised;
  animation: badge-loop $dur-loop $easing infinite;
}

// 항목마다 컴파일 시점에 고정된 서로 다른 지연 — 균일 간격이 아니라 흩뿌려진 느낌
@for $i from 1 through 5 {
  .badge:nth-child(#{$i}) { animation-delay: random($max-delay) * 1ms; }
}

@keyframes badge-loop {
  0%, 4%    { opacity: 0; transform: translateY(10px) scale(.9); }
  16%, 60%  { opacity: 1; transform: translateY(0) scale(1); }
  84%, 100% { opacity: 0; transform: translateY(-6px) scale(.95); }
}

@media (prefers-reduced-motion: reduce) {
  .badge { animation: none; opacity: 1; transform: 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);
}

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: min(380px, 90vw);
  font-weight: 700;
  font-size: clamp(11px, 3vw, 13px);
  line-height: 1.2;
  font-family: inherit;
}

.badge {
  padding: clamp(7px, 2.2vw, 9px) clamp(11px, 3vw, 14px);
  border-radius: 999px;
  background: #fff7e6;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  animation: badge-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.badge:nth-child(1) {
  animation-delay: 160ms;
}

.badge:nth-child(2) {
  animation-delay: 175ms;
}

.badge:nth-child(3) {
  animation-delay: 136ms;
}

.badge:nth-child(4) {
  animation-delay: 122ms;
}

.badge:nth-child(5) {
  animation-delay: 193ms;
}

@keyframes badge-loop {
  0%, 4% {
    opacity: 0;
    transform: translateY(10px) scale(0.9);
  }
  16%, 60% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  84%, 100% {
    opacity: 0;
    transform: translateY(-6px) scale(0.95);
  }
}
@media (prefers-reduced-motion: reduce) {
  .badge {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

import styles from "./RandomDelayBadges.module.scss";

export type RandomDelayBadgesProps = {
  badges: string[];
};

export default function RandomDelayBadges({ badges }: RandomDelayBadgesProps) {
  return (
    <div className={styles.badges}>
      {badges.map((label) => (
        <span key={label} className={styles.badge}>
          {label}
        </span>
      ))}
    </div>
  );
}