02ポラロイドの揺れ登場

<main class="stage">
  <figure class="swing is-demo" aria-label="ポラロイドカードが吊るされたまま揺れながら登場する">
    <span class="swing__pin" aria-hidden="true"></span>
    <span class="swing__string" aria-hidden="true"></span>
    <div class="swing__photo">
      <span class="swing__shot" aria-hidden="true"></span>
      <figcaption class="swing__caption">済州島、4月の海</figcaption>
    </div>
  </figure>
</main>

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

$duration: 1.1s;                                  // 흔들림이 잦아들 때까지의 시간
$easing: $ease-pop;                               // 오버슈트 — 그네 감쇠 운동
$color: $subject-blue;                            // 사진 그라데이션

@include stage($stage-yellow);

.swing {
  position: relative;
  margin: 0;
  width: min(190px, 56vw);
  transform-origin: top center;                   // 한 점에 매달림
}
.swing__pin {
  position: absolute;
  top: -6px; left: 50%;
  width: 12px; height: 12px;
  margin-left: -6px;
  border-radius: 50%;
  background: $stage-ink;
}
.swing__string {
  position: absolute;
  top: 0; left: 50%;
  width: 2px; height: 24px;
  margin-left: -1px;
  background: rgba(23, 20, 26, .4);
}
.swing__photo {
  margin-top: 24px;
  padding: $sp-2 $sp-2 $sp-1;
  background: $stage-paper;
  border-radius: $r-sm;
  box-shadow: $shadow-raised;
}
.swing__shot {
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: $r-xs;
  background: linear-gradient(160deg, $color 0%, $stage-yellow 90%);
}
.swing__caption {
  padding-top: $sp-2;
  font-weight: 600;
  font-size: clamp(12px, 3.4vw, 14px);
  font-family: inherit;
  color: $stage-ink;
  text-align: center;
}

// 실사용: 첫 등장 1회 — 기울어 떨어지며 좌우로 흔들리다 반듯하게 멈춘다
@keyframes swing-in {
  0%   { transform: translateY(-70px) rotate(18deg); opacity: 0; }
  18%  { transform: translateY(0) rotate(14deg);   opacity: 1; }
  38%  { transform: rotate(-11deg); }
  56%  { transform: rotate(7deg); }
  72%  { transform: rotate(-4deg); }
  86%  { transform: rotate(2deg); }
  100% { transform: rotate(0deg); }
}
.swing { animation: swing-in $duration $easing both; }

// 렌더·갤러리용 자동 루프: 등장→흔들림→사라짐을 2초 주기로
@keyframes swing-loop {
  0%   { transform: translateY(-70px) rotate(18deg); opacity: 0; }
  12%  { transform: translateY(0) rotate(14deg);   opacity: 1; }
  26%  { transform: rotate(-11deg); }
  38%  { transform: rotate(7deg); }
  48%  { transform: rotate(-4deg); }
  56%  { transform: rotate(0deg); }
  84%, 100% { transform: rotate(0deg); opacity: 1; }
}
.swing.is-demo { animation: swing-loop $dur-loop $easing infinite; }

@media (max-width: 360px) {          // 320×200 아이프레임 안에 whole 카드가 들어오게
  .swing { width: 112px; }
  .swing__string { height: 16px; }
  .swing__photo { margin-top: 16px; padding: 4px; }
  .swing__caption { font-size: 10px; padding-top: 4px; }
  .swing__pin { width: 8px; height: 8px; margin-left: -4px; top: -4px; }
}

@media (prefers-reduced-motion: reduce) {
  .swing,
  .swing.is-demo { animation: none; transform: none; }   // 반듯하게 걸린 최종 상태
}

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);
}

.swing {
  position: relative;
  margin: 0;
  width: min(190px, 56vw);
  transform-origin: top center;
}

.swing__pin {
  position: absolute;
  top: -6px;
  left: 50%;
  width: 12px;
  height: 12px;
  margin-left: -6px;
  border-radius: 50%;
  background: #17141a;
}

.swing__string {
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 24px;
  margin-left: -1px;
  background: rgba(23, 20, 26, 0.4);
}

.swing__photo {
  margin-top: 24px;
  padding: 8px 8px 4px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.swing__shot {
  display: block;
  aspect-ratio: 1/1;
  border-radius: 4px;
  background: linear-gradient(160deg, #2f6df6 0%, #ffd23f 90%);
}

.swing__caption {
  padding-top: 8px;
  font-weight: 600;
  font-size: clamp(12px, 3.4vw, 14px);
  font-family: inherit;
  color: #17141a;
  text-align: center;
}

@keyframes swing-in {
  0% {
    transform: translateY(-70px) rotate(18deg);
    opacity: 0;
  }
  18% {
    transform: translateY(0) rotate(14deg);
    opacity: 1;
  }
  38% {
    transform: rotate(-11deg);
  }
  56% {
    transform: rotate(7deg);
  }
  72% {
    transform: rotate(-4deg);
  }
  86% {
    transform: rotate(2deg);
  }
  100% {
    transform: rotate(0deg);
  }
}
.swing {
  animation: swing-in 1.1s cubic-bezier(0.2, 1.4, 0.4, 1) both;
}

@keyframes swing-loop {
  0% {
    transform: translateY(-70px) rotate(18deg);
    opacity: 0;
  }
  12% {
    transform: translateY(0) rotate(14deg);
    opacity: 1;
  }
  26% {
    transform: rotate(-11deg);
  }
  38% {
    transform: rotate(7deg);
  }
  48% {
    transform: rotate(-4deg);
  }
  56% {
    transform: rotate(0deg);
  }
  84%, 100% {
    transform: rotate(0deg);
    opacity: 1;
  }
}
.swing.is-demo {
  animation: swing-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@media (max-width: 360px) {
  .swing {
    width: 112px;
  }
  .swing__string {
    height: 16px;
  }
  .swing__photo {
    margin-top: 16px;
    padding: 4px;
  }
  .swing__caption {
    font-size: 10px;
    padding-top: 4px;
  }
  .swing__pin {
    width: 8px;
    height: 8px;
    margin-left: -4px;
    top: -4px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .swing,
  .swing.is-demo {
    animation: none;
    transform: none;
  }
}

import type { CSSProperties } from "react";
import { useEffect, useState } from "react";
import styles from "./PolaroidSwingIn.module.scss";

export type PolaroidSwingInProps = {
  caption: string;
  /** 흔들림이 잦아들 때까지의 시간 (기본 1100ms) */
  duration?: number;
  easing?: string;
  /** 사진 그라데이션 색 */
  color?: string;
  /** 다시 흔들려면 이 값을 바꾼다 */
  replayKey?: number;
};

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

export default function PolaroidSwingIn({
  caption,
  duration = 1100,
  easing = "cubic-bezier(.2, 1.4, .4, 1)",
  color = "#2f6df6",
  replayKey = 0,
}: PolaroidSwingInProps) {
  const [run, setRun] = useState(0);
  useEffect(() => { setRun(replayKey); }, [replayKey]);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <figure key={run} className={styles.swing} style={vars} aria-label={caption}>
      <span className={styles.pin} aria-hidden="true" />
      <span className={styles.string} aria-hidden="true" />
      <div className={styles.photo}>
        <span className={styles.shot} aria-hidden="true" />
        <figcaption className={styles.caption}>{caption}</figcaption>
      </div>
    </figure>
  );
}