02Chấm nảy lần lượt

<main class="stage">
  <div class="ts02-row is-demo">
    <span class="ts02-dot"></span>
    <span class="ts02-dot"></span>
    <span class="ts02-dot"></span>
    <span class="ts02-dot"></span>
    <span class="ts02-dot"></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;
$easing: $ease-pop;
$color: $stage-ink;

@include stage($stage-yellow);

.ts02-row {
  display: flex;
  align-items: center;
  gap: $sp-4;
}

.ts02-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: $color;
  transform: scale(0);
  opacity: 0;
}

// 실제 사용 코드: 뷰포트에 들어오면 순서대로 팝 (nth-child 델레이만 다르다)
@for $i from 1 through 5 {
  .ts02-row .ts02-dot:nth-child(#{$i}) {
    animation-delay: #{($i - 1) * 140}ms;
  }
}

.ts02-row.is-demo .ts02-dot {
  animation: ts02-pop $duration $easing infinite;
}

@keyframes ts02-pop {
  0%   { transform: scale(0);   opacity: 0; }
  10%  { transform: scale(1.25); opacity: 1; }
  20%  { transform: scale(1);   opacity: 1; }
  85%  { transform: scale(1);   opacity: 1; }
  92%  { transform: scale(0);   opacity: 0; }
  100% { transform: scale(0);   opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .ts02-dot, .ts02-row.is-demo .ts02-dot { animation: none !important; transform: scale(1) !important; opacity: 1 !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ts02-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.ts02-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #17141a;
  transform: scale(0);
  opacity: 0;
}

.ts02-row .ts02-dot:nth-child(1) {
  animation-delay: 0ms;
}

.ts02-row .ts02-dot:nth-child(2) {
  animation-delay: 140ms;
}

.ts02-row .ts02-dot:nth-child(3) {
  animation-delay: 280ms;
}

.ts02-row .ts02-dot:nth-child(4) {
  animation-delay: 420ms;
}

.ts02-row .ts02-dot:nth-child(5) {
  animation-delay: 560ms;
}

.ts02-row.is-demo .ts02-dot {
  animation: ts02-pop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes ts02-pop {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  10% {
    transform: scale(1.25);
    opacity: 1;
  }
  20% {
    transform: scale(1);
    opacity: 1;
  }
  85% {
    transform: scale(1);
    opacity: 1;
  }
  92% {
    transform: scale(0);
    opacity: 0;
  }
  100% {
    transform: scale(0);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ts02-dot, .ts02-row.is-demo .ts02-dot {
    animation: none !important;
    transform: scale(1) !important;
    opacity: 1 !important;
  }
}

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

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

export interface DotPopStaggerProps {
  duration?: string;
  easing?: string;
  color?: string;
  count?: number;
  stepDelay?: number;
}

export default function DotPopStagger({
  duration = "2s",
  easing = "cubic-bezier(.2, 1.4, .4, 1)",
  color = "#17141a",
  count = 5,
  stepDelay = 140,
}: DotPopStaggerProps) {
  const style: Vars = { "--duration": duration, "--easing": easing, "--color": color };
  return (
    <div className={styles.row} style={style}>
      {Array.from({ length: count }).map((_, i) => (
        <span key={i} className={styles.dot} style={{ animationDelay: `${i * stepDelay}ms` }} />
      ))}
    </div>
  );
}