03Circle mask grow

<main class="stage">
  <div class="cm-frame cm-focal is-demo">
    <div class="cm-photo"></div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-enter;
$easing: $ease-out;
$color: $subject-cream;

@include stage($stage-orange);

.cm-frame {
  position: relative;
  width: min(260px, 78vw);
  aspect-ratio: 8 / 5;
  border-radius: $r-card;
  overflow: hidden;
  box-shadow: $shadow-raised;
  background: $subject-ink; // 아직 안 드러난 부분이 보이는 바탕
}

.cm-photo {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(100px circle at 60% 35%, rgba(255, 255, 255, .55), transparent 58%),
    linear-gradient(150deg, $subject-blue, $color 140%);
  clip-path: circle(0% at 50% 50%);
}

// 실사용: 진짜 마우스 호버 — 정중앙에서 원형 clip-path 가 커지며 조리개처럼 열린다
.cm-photo { transition: clip-path $duration $easing; }
.cm-focal:hover .cm-photo { clip-path: circle(75% at 50% 50%); }

// 데모 루프
@keyframes cm-grow {
  0%, 8%   { clip-path: circle(0% at 50% 50%); }
  45%, 60% { clip-path: circle(75% at 50% 50%); }
  95%, 100% { clip-path: circle(0% at 50% 50%); }
}
.cm-frame.is-demo .cm-photo { animation: cm-grow $dur-loop $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .cm-focal:hover .cm-photo,
  .cm-frame.is-demo .cm-photo {
    animation: none !important;
    transition: none !important;
    clip-path: circle(75% at 50% 50%) !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);
}

.cm-frame {
  position: relative;
  width: min(260px, 78vw);
  aspect-ratio: 8/5;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  background: #17141a;
}

.cm-photo {
  position: absolute;
  inset: 0;
  background: radial-gradient(100px circle at 60% 35%, rgba(255, 255, 255, 0.55), transparent 58%), linear-gradient(150deg, #2f6df6, #fff7e6 140%);
  clip-path: circle(0% at 50% 50%);
}

.cm-photo {
  transition: clip-path 600ms ease-out;
}

.cm-focal:hover .cm-photo {
  clip-path: circle(75% at 50% 50%);
}

@keyframes cm-grow {
  0%, 8% {
    clip-path: circle(0% at 50% 50%);
  }
  45%, 60% {
    clip-path: circle(75% at 50% 50%);
  }
  95%, 100% {
    clip-path: circle(0% at 50% 50%);
  }
}
.cm-frame.is-demo .cm-photo {
  animation: cm-grow 2s ease-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .cm-focal:hover .cm-photo,
  .cm-frame.is-demo .cm-photo {
    animation: none !important;
    transition: none !important;
    clip-path: circle(75% at 50% 50%) !important;
  }
}

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

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

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

export default function CircleMaskGrow({
  duration = "550ms",
  easing = "ease-out",
  color = "#fff7e6",
}: CircleMaskGrowProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.frame} style={style}>
      <div className={styles.photo} />
    </div>
  );
}