08쌓이는 큐브

<main class="stage">
  <div class="cs-grid is-demo" aria-hidden="true">
    <span class="cs-cell"><span class="cs-cube"></span></span>
    <span class="cs-cell"><span class="cs-cube"></span></span>
    <span class="cs-cell"><span class="cs-cube"></span></span>
    <span class="cs-cell"><span class="cs-cube"></span></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 2s;
$easing: $ease-pop;
$color: $subject-lilac;

@include stage($stage-paper);

.cs-grid {
  display: grid;
  grid-template-columns: repeat(2, 56px);
  grid-auto-rows: 56px;
  gap: $sp-3;
}

.cs-cell {
  display: grid;
  place-items: center;
}

// 실사용: 로딩 중에만 .is-loading — 등장(안쪽 큐브 scale)은 하나씩,
// 착지(바깥 셀 translate)는 전부 같은 박자에
.cs-cube {
  width: 48px;
  height: 48px;
  border-radius: $r-control;
  background: $color;
  box-shadow: $shadow-press;
}

.is-loading .cs-cell,
.is-demo .cs-cell {
  animation: cs-settle $duration $easing infinite;
}
.is-loading .cs-cube,
.is-demo .cs-cube {
  animation: cs-pop $duration $easing infinite backwards;
}
.is-loading .cs-cell:nth-child(1) .cs-cube,
.is-demo .cs-cell:nth-child(1) .cs-cube { animation-delay: 0s; }
.is-loading .cs-cell:nth-child(2) .cs-cube,
.is-demo .cs-cell:nth-child(2) .cs-cube { animation-delay: 120ms; }
.is-loading .cs-cell:nth-child(3) .cs-cube,
.is-demo .cs-cell:nth-child(3) .cs-cube { animation-delay: 240ms; }
.is-loading .cs-cell:nth-child(4) .cs-cube,
.is-demo .cs-cell:nth-child(4) .cs-cube { animation-delay: 360ms; }

@keyframes cs-pop {
  0%        { transform: scale(0); opacity: 0; }
  16%       { transform: scale(1.18); opacity: 1; }
  22%, 68%  { transform: scale(1); opacity: 1; }
  90%, 100% { transform: scale(0); opacity: 0; }
}

@keyframes cs-settle {
  0%, 60%   { transform: translateY(0); }
  70%       { transform: translateY(8px); }
  80%, 100% { transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .is-loading .cs-cell,
  .is-loading .cs-cube,
  .is-demo .cs-cell,
  .is-demo .cs-cube {
    animation: none !important;
    transform: none !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: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.cs-grid {
  display: grid;
  grid-template-columns: repeat(2, 56px);
  grid-auto-rows: 56px;
  gap: 12px;
}

.cs-cell {
  display: grid;
  place-items: center;
}

.cs-cube {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #b9a0ff;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.is-loading .cs-cell,
.is-demo .cs-cell {
  animation: cs-settle 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.is-loading .cs-cube,
.is-demo .cs-cube {
  animation: cs-pop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite backwards;
}

.is-loading .cs-cell:nth-child(1) .cs-cube,
.is-demo .cs-cell:nth-child(1) .cs-cube {
  animation-delay: 0s;
}

.is-loading .cs-cell:nth-child(2) .cs-cube,
.is-demo .cs-cell:nth-child(2) .cs-cube {
  animation-delay: 120ms;
}

.is-loading .cs-cell:nth-child(3) .cs-cube,
.is-demo .cs-cell:nth-child(3) .cs-cube {
  animation-delay: 240ms;
}

.is-loading .cs-cell:nth-child(4) .cs-cube,
.is-demo .cs-cell:nth-child(4) .cs-cube {
  animation-delay: 360ms;
}

@keyframes cs-pop {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  16% {
    transform: scale(1.18);
    opacity: 1;
  }
  22%, 68% {
    transform: scale(1);
    opacity: 1;
  }
  90%, 100% {
    transform: scale(0);
    opacity: 0;
  }
}
@keyframes cs-settle {
  0%, 60% {
    transform: translateY(0);
  }
  70% {
    transform: translateY(8px);
  }
  80%, 100% {
    transform: translateY(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .is-loading .cs-cell,
  .is-loading .cs-cube,
  .is-demo .cs-cell,
  .is-demo .cs-cube {
    animation: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}

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

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

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

export default function CubeStack({
  duration = "2s",
  easing = "cubic-bezier(.2, 1.4, .4, 1)",
  color = "#b9a0ff",
}: CubeStackProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.grid} style={style} aria-hidden="true">
      {[0, 1, 2, 3].map((i) => (
        <span key={i} className={`${styles.cell} ${styles["d" + i]}`}>
          <span className={styles.cube} />
        </span>
      ))}
    </div>
  );
}