05Firework dots

<main class="stage">
  <div class="fw-wrap is-demo">
    <span class="fw-dot"></span><span class="fw-dot"></span><span class="fw-dot"></span><span class="fw-dot"></span>
    <span class="fw-dot"></span><span class="fw-dot"></span><span class="fw-dot"></span><span class="fw-dot"></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1s;
$easing: $ease-out;
$color: $stage-yellow;

@include stage($stage-ink);

$piece-colors: $color, $subject-blue, $stage-orange, $subject-cream;

.fw-wrap {
  position: relative;
  width: 8px;
  height: 8px;
}

.fw-dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: $r-pill;
  opacity: 0;
}

// 점 8개가 --angle 을 30~360deg 로 나눠 갖고, rotate + translateY 로 불꽃처럼 퍼진다
@for $i from 1 through 8 {
  .fw-dot:nth-child(#{$i}) {
    background: nth($piece-colors, ($i - 1) % 4 + 1);
    --angle: #{$i * 45deg};
  }
}

@keyframes fw-burst {
  0%   { transform: rotate(var(--angle)) translateY(0) scale(1); opacity: 1; }
  70%  { opacity: 1; }
  100% { transform: rotate(var(--angle)) translateY(-92px) scale(.3); opacity: 0; }
}

.fw-wrap.is-demo .fw-dot { animation: fw-burst $duration $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .fw-wrap.is-demo .fw-dot { animation: none !important; opacity: 0 !important; }
}

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);
}

.fw-wrap {
  position: relative;
  width: 8px;
  height: 8px;
}

.fw-dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  opacity: 0;
}

.fw-dot:nth-child(1) {
  background: #ffd23f;
  --angle: 45deg;
}

.fw-dot:nth-child(2) {
  background: #2f6df6;
  --angle: 90deg;
}

.fw-dot:nth-child(3) {
  background: #ff4d1f;
  --angle: 135deg;
}

.fw-dot:nth-child(4) {
  background: #fff7e6;
  --angle: 180deg;
}

.fw-dot:nth-child(5) {
  background: #ffd23f;
  --angle: 225deg;
}

.fw-dot:nth-child(6) {
  background: #2f6df6;
  --angle: 270deg;
}

.fw-dot:nth-child(7) {
  background: #ff4d1f;
  --angle: 315deg;
}

.fw-dot:nth-child(8) {
  background: #fff7e6;
  --angle: 360deg;
}

@keyframes fw-burst {
  0% {
    transform: rotate(var(--angle)) translateY(0) scale(1);
    opacity: 1;
  }
  70% {
    opacity: 1;
  }
  100% {
    transform: rotate(var(--angle)) translateY(-92px) scale(0.3);
    opacity: 0;
  }
}
.fw-wrap.is-demo .fw-dot {
  animation: fw-burst 1s ease-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .fw-wrap.is-demo .fw-dot {
    animation: none !important;
    opacity: 0 !important;
  }
}

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

type Vars = CSSProperties & Record<string, string>;

export interface FireworkDotsProps {
  duration?: string;
  easing?: string;
  color?: string;
}

const COLORS = ["var(--color)", "#2f6df6", "#ff4d1f", "#fff7e6"];

export default function FireworkDots({
  duration = "1s",
  easing = "ease-out",
  color = "#ffd23f",
}: FireworkDotsProps) {
  const style: Vars = { "--duration": duration, "--easing": easing, "--color": color };
  return (
    <div className={styles.wrap} style={style}>
      {Array.from({ length: 8 }, (_, i) => {
        const dotStyle: Vars = {
          background: COLORS[i % COLORS.length],
          "--angle": `${(i + 1) * 45}deg`,
        };
        return <span key={i} className={styles.dot} style={dotStyle} />;
      })}
    </div>
  );
}