03Morphing blob

<main class="stage">
  <div class="mb-blob is-demo" aria-hidden="true"></div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 2s;
$easing: linear;
$color: $subject-cream;

@include stage($stage-orange);

// 실사용: 로딩 중에만 .is-loading
.mb-blob {
  width: 112px;
  height: 112px;
  border-radius: 58% 42% 43% 57% / 45% 58% 42% 55%;   // 정지 모양도 블롭
  background: $color;
}

.mb-blob.is-loading,
.mb-blob.is-demo {
  // 반경 여덟 값이 순서를 바꾸며 모양을 바꾸고, 회전이 붙어 한 바퀴에 정확히 돌아온다
  animation: mb-morph $duration $easing infinite;
}

@keyframes mb-morph {
  0% {
    border-radius: 58% 42% 43% 57% / 45% 58% 42% 55%;
    transform: rotate(0deg) scale(1);
  }
  25% {
    border-radius: 45% 55% 60% 40% / 52% 42% 58% 48%;
    transform: rotate(90deg) scale(1.06);
  }
  50% {
    border-radius: 57% 43% 40% 60% / 55% 47% 53% 45%;
    transform: rotate(180deg) scale(0.96);
  }
  75% {
    border-radius: 42% 58% 57% 43% / 48% 55% 45% 52%;
    transform: rotate(270deg) scale(1.04);
  }
  100% {
    border-radius: 58% 42% 43% 57% / 45% 58% 42% 55%;
    transform: rotate(360deg) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mb-blob.is-loading,
  .mb-blob.is-demo {
    animation: none !important;
    transform: none !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);
}

.mb-blob {
  width: 112px;
  height: 112px;
  border-radius: 58% 42% 43% 57%/45% 58% 42% 55%;
  background: #fff7e6;
}

.mb-blob.is-loading,
.mb-blob.is-demo {
  animation: mb-morph 2s linear infinite;
}

@keyframes mb-morph {
  0% {
    border-radius: 58% 42% 43% 57%/45% 58% 42% 55%;
    transform: rotate(0deg) scale(1);
  }
  25% {
    border-radius: 45% 55% 60% 40%/52% 42% 58% 48%;
    transform: rotate(90deg) scale(1.06);
  }
  50% {
    border-radius: 57% 43% 40% 60%/55% 47% 53% 45%;
    transform: rotate(180deg) scale(0.96);
  }
  75% {
    border-radius: 42% 58% 57% 43%/48% 55% 45% 52%;
    transform: rotate(270deg) scale(1.04);
  }
  100% {
    border-radius: 58% 42% 43% 57%/45% 58% 42% 55%;
    transform: rotate(360deg) scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .mb-blob.is-loading,
  .mb-blob.is-demo {
    animation: none !important;
    transform: none !important;
  }
}

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

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

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

export default function MorphingBlob({
  duration = "2s",
  easing = "linear",
  color = "#fff7e6",
}: MorphingBlobProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return <div className={styles.blob} style={style} aria-hidden="true" />;
}