02Carousel 3D

<main class="stage">
  <div class="scene">
    <ul class="ring is-demo">
      <li class="ring__card">Hàng mới</li>
      <li class="ring__card">Bán chạy</li>
      <li class="ring__card">Giảm giá</li>
      <li class="ring__card">Đánh giá</li>
      <li class="ring__card">Đề xuất</li>
    </ul>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: 8s;                                         // 링이 한 바퀴 도는 시간 (개수가 늘면 느리게)
$easing: linear;
$color: $subject-cream;                                // 카드 배경

@include stage($stage-yellow);

$count: 5;
$step: 72deg;                                            // 360deg ÷ 5장
$radius: 118px;                                         // 카드 폭(92px)이 안 겹치도록 계산한 반지름

.scene { perspective: 560px; }

.ring {
  position: relative;
  width: 92px;
  height: 56px;
  list-style: none;
  margin: 0;
  padding: 0;
  transform-style: preserve-3d;
  animation: orbit $duration $easing infinite;
}
.ring__card {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: $r-control;
  background: $color;
  color: $subject-ink;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  font-family: inherit;
  box-shadow: $shadow-press;
  backface-visibility: hidden;                          // 뒤로 넘어간 카드 글자가 반전돼 비치지 않게
}

// 카드 5장을 원 둘레에 72deg 간격으로 세운다 — rotateY 로 배치만 하고, 도는 건 부모 .ring 하나
@for $i from 1 through 5 {
  .ring__card:nth-child(#{$i}) {
    transform: rotateY(#{($i - 1) * $step}) translateZ($radius);
  }
}

@keyframes orbit {
  from { transform: rotateY(0deg); }
  to   { transform: rotateY(360deg); }
}

// ── 접근성: 움직임 줄이기 설정이면 정면 카드 하나만 보이게 고정 ──────
@media (prefers-reduced-motion: reduce) {
  .ring { animation: none; transform: rotateY(0deg); }
}

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);
}

.scene {
  perspective: 560px;
}

.ring {
  position: relative;
  width: 92px;
  height: 56px;
  list-style: none;
  margin: 0;
  padding: 0;
  transform-style: preserve-3d;
  animation: orbit 8s linear infinite;
}

.ring__card {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #fff7e6;
  color: #17141a;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  backface-visibility: hidden;
}

.ring__card:nth-child(1) {
  transform: rotateY(0deg) translateZ(118px);
}

.ring__card:nth-child(2) {
  transform: rotateY(72deg) translateZ(118px);
}

.ring__card:nth-child(3) {
  transform: rotateY(144deg) translateZ(118px);
}

.ring__card:nth-child(4) {
  transform: rotateY(216deg) translateZ(118px);
}

.ring__card:nth-child(5) {
  transform: rotateY(288deg) translateZ(118px);
}

@keyframes orbit {
  from {
    transform: rotateY(0deg);
  }
  to {
    transform: rotateY(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .ring {
    animation: none;
    transform: rotateY(0deg);
  }
}

import type { CSSProperties } from "react";
import styles from "./Carousel3D.module.scss";

export type Carousel3DProps = {
  /** 링이 한 바퀴 도는 시간 (기본 8000ms). 카드가 늘면 느리게 */
  duration?: number;
  easing?: string;
  /** 카드 배경 */
  color?: string;
  cards?: string[];
};

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

export default function Carousel3D({
  duration = 8000,
  easing = "linear",
  color = "#fff7e6",
  cards = ["신상품", "베스트", "할인", "리뷰", "추천"],
}: Carousel3DProps) {
  const step = 360 / cards.length;
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <div className={styles.scene}>
      <ul className={styles.ring} style={vars}>
        {cards.map((c, i) => (
          <li key={c} className={styles.card} style={{ transform: `rotateY(${i * step}deg) translateZ(118px)` }}>
            {c}
          </li>
        ))}
      </ul>
    </div>
  );
}