07Uốn mềm dẻo (gunyagunya)

<main class="stage">
  <div class="blob o-gunya" aria-hidden="true"></div>
  <span class="tag">Mềm oặt</span>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 3.2s;
$easing: ease-in-out;
$color: $subject-cream;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-orange);
.stage { position: relative; }

.blob {
  width: 140px;
  height: 140px;
  background: $color;
}
.tag {
  position: absolute;
  top: $sp-4;
  right: $sp-4;
  padding: $sp-1 $sp-3;
  border-radius: $r-sm;
  background: rgba(255, 255, 255, .18);
  color: $stage-ink;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: .04em;
}

// ── 사인파 soft-body — border-radius 여덟 값(가로4·세로4)을 위상차 π/4 의 사인파로 흔든다 ──
// r_k = 50 + 18·sin(2πt + k·π/4). 매끈한 원이 아니라 **여러 지점이 각자 다른 위상으로** 출렁여야
// 말랑한 덩어리로 보인다 — 한 값만 흔들면 타원이 커졌다 작아질 뿐이다 (형태 2차, 사용자 2026-09-14).
// keyframes 다섯 지점(0·20·45·70·95%)은 이 식을 t = pct/100·2π 로 대입한 계산 결과값이다.
.o-gunya {
  animation: o-gunya $duration $easing infinite;
}
@keyframes o-gunya {
  0%, 100% { border-radius: 50% 63% 68% 63% / 50% 37% 32% 37%; transform: rotate(0deg); }
  20%      { border-radius: 67% 66% 56% 42% / 33% 34% 44% 58%; transform: rotate(5deg); }
  45%      { border-radius: 56% 42% 33% 34% / 44% 58% 67% 66%; transform: rotate(2deg); }
  70%      { border-radius: 33% 34% 44% 58% / 67% 66% 56% 42%; transform: rotate(-5deg); }
  95%      { border-radius: 44% 58% 67% 66% / 56% 42% 33% 34%; transform: rotate(-2deg); }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .o-gunya { animation: none; }
}

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);
}

.stage {
  position: relative;
}

.blob {
  width: 140px;
  height: 140px;
  background: #fff7e6;
}

.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.18);
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}

.o-gunya {
  animation: o-gunya 3.2s ease-in-out infinite;
}

@keyframes o-gunya {
  0%, 100% {
    border-radius: 50% 63% 68% 63%/50% 37% 32% 37%;
    transform: rotate(0deg);
  }
  20% {
    border-radius: 67% 66% 56% 42%/33% 34% 44% 58%;
    transform: rotate(5deg);
  }
  45% {
    border-radius: 56% 42% 33% 34%/44% 58% 67% 66%;
    transform: rotate(2deg);
  }
  70% {
    border-radius: 33% 34% 44% 58%/67% 66% 56% 42%;
    transform: rotate(-5deg);
  }
  95% {
    border-radius: 44% 58% 67% 66%/56% 42% 33% 34%;
    transform: rotate(-2deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .o-gunya {
    animation: none;
  }
}

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

export type BlobMorphProps = {
  /** 한 바퀴(세 모양) 도는 데 걸리는 시간 (기본 3200ms) */
  duration?: number;
  easing?: string;
  color?: string;
  size?: number;
};

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

export default function BlobMorph({
  duration = 3200,
  easing = "ease-in-out",
  color = "#fff7e6",
  size = 140,
}: BlobMorphProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
    "--size": `${size}px`,
  };
  return <div className={styles.blob} style={vars} aria-hidden="true" />;
}