06카드→상세 확대 전환

<main class="stage">
  <div class="pages is-demo">
    <section class="page page--grid">
      <p class="page__tag">NEWS</p>
      <div class="grid">
        <span class="cell cell--focus"></span>
        <span class="cell"></span>
        <span class="cell"></span>
        <span class="cell"></span>
      </div>
    </section>
    <div class="detail">
      <p class="detail__body">기사 본문이 이 자리를 채운다</p>
    </div>
  </div>
</main>

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

// ── 변수 3개. 변형은 이것만 바꾼다 (값은 토큰에서 받는다) ──────
$duration: $dur-enter;
$easing: $ease-spring;
$color: $subject-ink;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-yellow);

.pages { position: relative; width: min(300px, 88%); height: 150px; border-radius: $r-card; overflow: hidden; box-shadow: $shadow-raised; background: #fff; }
.page--grid { position: absolute; inset: 0; box-sizing: border-box; padding: clamp(12px, 5vw, 18px); display: flex; flex-direction: column; gap: 8px; }
.page__tag { margin: 0; font-weight: 700; font-size: clamp(9px, 2.6vw, 11px); line-height: 1; font-family: inherit; letter-spacing: .12em; color: $subject-ink; opacity: .55; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; flex: 1; }
.cell { border-radius: 8px; background: $subject-ink; opacity: .12; }
.cell--focus { background: $color; opacity: 1; }

// 클릭한 카드(cell--focus)가 화면을 가득 채우도록 transform 으로만 확대한다.
.cell--focus {
  position: relative;
  animation: zoom-card $dur-loop $easing infinite;
}
.detail {
  position: absolute; inset: 0; background: $color; color: #fff;
  display: flex; align-items: flex-end; box-sizing: border-box; padding: clamp(12px, 5vw, 18px);
  opacity: 0;
  animation: zoom-detail $dur-loop $easing infinite;
}
.detail__body { margin: 0; font-weight: 400; font-size: clamp(11px, 3.2vw, 13px); line-height: 1.5; font-family: inherit; }

@keyframes zoom-card {
  0%, 40% { transform: scale(1); }
  70% { transform: scale(4); }
  100% { transform: scale(1); }
}
@keyframes zoom-detail {
  0%, 55% { opacity: 0; }
  75%, 90% { opacity: 1; }
  100% { opacity: 0; }
}

// ── 접근성: 움직임 줄이기 설정이면 최종 상태만 고정으로 ────────
@media (prefers-reduced-motion: reduce) {
  .cell--focus, .detail { animation: none !important; }
  .detail { opacity: 0; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.pages {
  position: relative;
  width: min(300px, 88%);
  height: 150px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  background: #fff;
}

.page--grid {
  position: absolute;
  inset: 0;
  box-sizing: border-box;
  padding: clamp(12px, 5vw, 18px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page__tag {
  margin: 0;
  font-weight: 700;
  font-size: clamp(9px, 2.6vw, 11px);
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.12em;
  color: #17141a;
  opacity: 0.55;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  flex: 1;
}

.cell {
  border-radius: 8px;
  background: #17141a;
  opacity: 0.12;
}

.cell--focus {
  background: #17141a;
  opacity: 1;
}

.cell--focus {
  position: relative;
  animation: zoom-card 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.detail {
  position: absolute;
  inset: 0;
  background: #17141a;
  color: #fff;
  display: flex;
  align-items: flex-end;
  box-sizing: border-box;
  padding: clamp(12px, 5vw, 18px);
  opacity: 0;
  animation: zoom-detail 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.detail__body {
  margin: 0;
  font-weight: 400;
  font-size: clamp(11px, 3.2vw, 13px);
  line-height: 1.5;
  font-family: inherit;
}

@keyframes zoom-card {
  0%, 40% {
    transform: scale(1);
  }
  70% {
    transform: scale(4);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes zoom-detail {
  0%, 55% {
    opacity: 0;
  }
  75%, 90% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cell--focus, .detail {
    animation: none !important;
  }
  .detail {
    opacity: 0;
  }
}

import type { CSSProperties, ReactNode } from "react";
import styles from "./ZoomCardTransition.module.scss";

export type ZoomCardTransitionProps = {
  /** "grid": 카드 목록, "detail": 확대된 상세 */
  active: "grid" | "detail";
  detail: ReactNode;
  /** 확대가 끝나는 시간 (기본 600ms) */
  duration?: number;
  easing?: string;
  color?: string;
  className?: string;
};

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

export default function ZoomCardTransition({
  active,
  detail,
  duration = 600,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#17141a",
  className = "",
}: ZoomCardTransitionProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <div className={`${styles.pages} ${className}`} style={vars} data-active={active}>
      <div className={styles.grid}>
        <span className={styles.cellFocus} />
        <span className={styles.cell} />
        <span className={styles.cell} />
        <span className={styles.cell} />
      </div>
      <div className={styles.detail}>{detail}</div>
    </div>
  );
}