07Stacked card swipe

<main class="stage">
  <div class="cs">
    <div class="cs__deck">
      <div class="cs__card cs__card--1"></div>
      <div class="cs__card cs__card--2"></div>
      <div class="cs__card cs__card--3"></div>
    </div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-base;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-orange);

.cs { width: min(170px, 38vw); }

// ── 실제 동작: 카드 3장이 같은 자리(grid-area: 1/1)에 겹쳐 있다. 스크롤 상자가 없다 ──
.cs__deck {
  display: grid;
  aspect-ratio: 3 / 4;
}
.cs__card {
  grid-area: 1 / 1;
  border-radius: $r-card;
  box-shadow: $shadow-raised;
  animation: cs-cycle $dur-loop $easing infinite;
}
.cs__card--1 { background: linear-gradient(160deg, $color, #d6ddeb); animation-delay: -0s; }
.cs__card--2 { background: linear-gradient(160deg, $stage-yellow, #ebe7d6); animation-delay: -.667s; }
.cs__card--3 { background: linear-gradient(160deg, $subject-ink, #4a3f5c); animation-delay: -1.333s; }

// 맨 위 카드가 옆으로 미끄러지며 빠지고, 빠진 카드는 스택 맨 뒤에서 다시 앞으로 올라온다
@keyframes cs-cycle {
  0%, 4%     { transform: translate(0, 0) scale(1) rotate(0deg); opacity: 1; z-index: 3; }
  29%        { transform: translate(42%, 6%) scale(1) rotate(12deg); opacity: 0; z-index: 3; }
  29.1%      { transform: translate(-6%, 6%) scale(.9) rotate(-4deg); opacity: 0; z-index: 1; }
  33%, 62%   { transform: translate(-6%, 6%) scale(.9) rotate(-4deg); opacity: .85; z-index: 1; }
  66%, 96%   { transform: translate(6%, 4%) scale(.95) rotate(3deg); opacity: .92; z-index: 2; }
  100%       { transform: translate(0, 0) scale(1) rotate(0deg); opacity: 1; z-index: 3; }
}

// 자동 순환이 전부다 — 마우스를 올리면 잠깐 멈춰서 지금 카드를 편하게 본다
.cs:hover .cs__card { animation-play-state: paused; }

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .cs__card { animation: none !important; }
  .cs__card--1 { opacity: 1; z-index: 3; transform: none; }
  .cs__card--2, .cs__card--3 { opacity: 0; }
}

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);
}

.cs {
  width: min(170px, 38vw);
}

.cs__deck {
  display: grid;
  aspect-ratio: 3/4;
}

.cs__card {
  grid-area: 1/1;
  border-radius: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  animation: cs-cycle 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.cs__card--1 {
  background: linear-gradient(160deg, #2f6df6, #d6ddeb);
  animation-delay: -0s;
}

.cs__card--2 {
  background: linear-gradient(160deg, #ffd23f, #ebe7d6);
  animation-delay: -0.667s;
}

.cs__card--3 {
  background: linear-gradient(160deg, #17141a, #4a3f5c);
  animation-delay: -1.333s;
}

@keyframes cs-cycle {
  0%, 4% {
    transform: translate(0, 0) scale(1) rotate(0deg);
    opacity: 1;
    z-index: 3;
  }
  29% {
    transform: translate(42%, 6%) scale(1) rotate(12deg);
    opacity: 0;
    z-index: 3;
  }
  29.1% {
    transform: translate(-6%, 6%) scale(0.9) rotate(-4deg);
    opacity: 0;
    z-index: 1;
  }
  33%, 62% {
    transform: translate(-6%, 6%) scale(0.9) rotate(-4deg);
    opacity: 0.85;
    z-index: 1;
  }
  66%, 96% {
    transform: translate(6%, 4%) scale(0.95) rotate(3deg);
    opacity: 0.92;
    z-index: 2;
  }
  100% {
    transform: translate(0, 0) scale(1) rotate(0deg);
    opacity: 1;
    z-index: 3;
  }
}
.cs:hover .cs__card {
  animation-play-state: paused;
}

@media (prefers-reduced-motion: reduce) {
  .cs__card {
    animation: none !important;
  }
  .cs__card--1 {
    opacity: 1;
    z-index: 3;
    transform: none;
  }
  .cs__card--2, .cs__card--3 {
    opacity: 0;
  }
}

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

export type StackedCardSwipeProps = {
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function StackedCardSwipe({ duration = 2000, easing = "cubic-bezier(.2,.8,.2,1)", color = "#2f6df6" }: StackedCardSwipeProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <div className={styles.cs} style={vars}>
      {/* 카드 3장이 같은 자리(grid-area: 1/1)에 겹쳐 있고, @keyframes 하나가 순서대로 옆으로 빠진다 — 0줄 JS */}
      <div className={styles.deck}>
        {[1, 2, 3].map((n) => (
          <div key={n} className={`${styles.card} ${styles["card" + n]}`} />
        ))}
      </div>
    </div>
  );
}