07Confetti chỉ bằng pseudo-element

<main class="stage">
  <div class="pc-card is-demo">
    <span class="pc-label">Hoàn tất</span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1.2s;
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-orange);

.pc-card {
  position: relative;
  width: 190px;
  height: 116px;
  border-radius: $r-card;
  background: $subject-ink;
  overflow: hidden;
  display: grid;
  place-items: center;
}

.pc-label {
  color: $subject-cream;
  font: 700 14px/1 -apple-system, "Segoe UI", sans-serif;
}

// 마크업엔 요소를 하나도 더하지 않는다 — ::before·::after 각각 box-shadow 로 점 6개씩을 그린다
.pc-card::before,
.pc-card::after {
  content: "";
  position: absolute;
  top: -18px;
  left: 14px;
  width: 6px;
  height: 6px;
  border-radius: $r-pill;
  background: $color;
  box-shadow:
    22px -8px 0 -1px $stage-yellow,
    44px 6px  0 0  $stage-orange,
    66px -12px 0 -1px $subject-cream,
    88px 4px  0 0  $color,
    110px -6px 0 -1px $stage-yellow,
    132px 8px 0 0  $subject-cream;
  opacity: 0;
}
.pc-card::after { left: 4px; }

@keyframes pc-fall {
  0%   { transform: translateY(0) rotate(0deg); opacity: 0; }
  12%  { opacity: 1; }
  100% { transform: translateY(150px) rotate(220deg); opacity: 0; }
}

.pc-card.is-demo::before,
.pc-card.is-demo::after { animation: pc-fall $duration $easing infinite; }
.pc-card.is-demo::after { animation-delay: 260ms; }

@media (prefers-reduced-motion: reduce) {
  .pc-card.is-demo::before,
  .pc-card.is-demo::after { 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: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.pc-card {
  position: relative;
  width: 190px;
  height: 116px;
  border-radius: 16px;
  background: #17141a;
  overflow: hidden;
  display: grid;
  place-items: center;
}

.pc-label {
  color: #fff7e6;
  font: 700 14px/1 -apple-system, "Segoe UI", sans-serif;
}

.pc-card::before,
.pc-card::after {
  content: "";
  position: absolute;
  top: -18px;
  left: 14px;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: #2f6df6;
  box-shadow: 22px -8px 0 -1px #ffd23f, 44px 6px 0 0 #ff4d1f, 66px -12px 0 -1px #fff7e6, 88px 4px 0 0 #2f6df6, 110px -6px 0 -1px #ffd23f, 132px 8px 0 0 #fff7e6;
  opacity: 0;
}

.pc-card::after {
  left: 4px;
}

@keyframes pc-fall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  100% {
    transform: translateY(150px) rotate(220deg);
    opacity: 0;
  }
}
.pc-card.is-demo::before,
.pc-card.is-demo::after {
  animation: pc-fall 1.2s ease-out infinite;
}

.pc-card.is-demo::after {
  animation-delay: 260ms;
}

@media (prefers-reduced-motion: reduce) {
  .pc-card.is-demo::before,
  .pc-card.is-demo::after {
    animation: none !important;
    opacity: 0 !important;
  }
}

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

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

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

// 마크업엔 요소를 하나도 더하지 않는다 — ::before·::after(module.scss) 만으로 점을 그린다
export default function PseudoOnlyConfetti({
  duration = "1.2s",
  easing = "ease-out",
  color = "#2f6df6",
}: PseudoOnlyConfettiProps) {
  const style: Vars = { "--duration": duration, "--easing": easing, "--color": color };
  return (
    <div className={styles.card} style={style}>
      <span className={styles.label}>완료</span>
    </div>
  );
}