09Diagonal scene swap

<main class="stage">
  <section class="scene is-demo" aria-label="Two diagonal panels sweep past and swap the scene">
    <input class="scene__check" type="checkbox" id="scene-swap">
    <div class="scene__frame">
      <div class="scene__inner scene__inner--a"><p class="scene__name">Spring collection</p></div>
      <div class="scene__inner scene__inner--b"><p class="scene__name">Summer collection</p></div>
      <div class="scene__wipes" aria-hidden="true">
        <span class="scene__wipe scene__wipe--1"></span>
        <span class="scene__wipe scene__wipe--2"></span>
      </div>
    </div>
    <label class="scene__btn" for="scene-swap">Swap scene</label>
  </section>
</main>

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

$duration: 1s;                                    // 판이 프레임을 통과하는 시간
$easing: $ease-spring;
$color: $subject-blue;                            // A 장면 색

@include stage($stage-ink);

.scene {
  display: grid;
  justify-items: center;
  gap: $sp-3;
}
.scene__check { position: absolute; opacity: 0; pointer-events: none; }

.scene__frame {
  position: relative;
  width: min(320px, 90vw);
  height: clamp(96px, 50vh, 172px);
  border-radius: $r-card;
  overflow: hidden;
}
.scene__inner {
  position: absolute; inset: 0;
  display: grid;
  place-items: center;
  transition: opacity $dur-quick linear calc(#{$duration} / 2);   // 판이 덮는 중간에 교체
}
.scene__inner--a { background: linear-gradient(140deg, $color 0%, $subject-cream 100%); opacity: 1; }
.scene__inner--b { background: linear-gradient(140deg, $stage-orange 0%, $stage-yellow 100%); opacity: 0; }
.scene__name {
  margin: 0;
  font-weight: 800;
  font-size: clamp(18px, 5.2vw, 24px);
  font-family: inherit;
  color: $stage-ink;
}

// ── 대각선 판 2개: skew 로 비스듬히 눕히고 좌우로 통과시킨다 (clip-path 아님)
.scene__wipes { position: absolute; inset: 0; }
.scene__wipe {
  position: absolute;
  top: -20%; bottom: -20%; left: -45%;
  width: 190%;
  background: $stage-paper;
  transform: skewX(-14deg) translateX(-115%);
}
.scene__wipe--2 { background: rgba(255, 210, 63, .92); }

// 버튼: 판이 프레임을 쓸고 지나가며 장면이 바뀐다
.scene__btn {
  padding: $sp-2 $sp-5;
  border-radius: $r-control;
  border: 2px solid rgba(255, 255, 255, .4);
  font-weight: 700;
  font-size: 13px;
  font-family: inherit;
  color: $stage-paper;
  cursor: pointer;
  transition: transform $dur-quick $easing, border-color $dur-quick $easing;
}
.scene__btn:active { transform: scale(.94); }

// 체크: 판이 왼→오른쪽으로 통과 (transition 이라 해제하면 역방향 통과가 된다)
.scene__wipe { transition: transform $duration $easing; }
.scene__wipe--2 { transition-delay: 100ms; }
#scene-swap:checked ~ .scene__frame .scene__wipe { transform: skewX(-14deg) translateX(115%); }
#scene-swap:checked ~ .scene__frame .scene__inner--a { opacity: 0; }
#scene-swap:checked ~ .scene__frame .scene__inner--b { opacity: 1; }

// 렌더·갤러리용 자동 루프: A → 판 통과 → B → 판 역통과 → A
.scene.is-demo .scene__wipe--1 { animation: wipe-loop-1 $dur-loop $easing infinite; }
.scene.is-demo .scene__wipe--2 { animation: wipe-loop-2 $dur-loop $easing infinite; }
.scene.is-demo .scene__inner--a { animation: inner-a $dur-loop $easing infinite; }
.scene.is-demo .scene__inner--b { animation: inner-b $dur-loop $easing infinite; }

@keyframes wipe-loop-1 {
  0%, 8%    { transform: skewX(-14deg) translateX(-115%); }   // 순방향 통과
  34%       { transform: skewX(-14deg) translateX(115%); }
  52%, 58%  { transform: skewX(-14deg) translateX(115%); }    // 역방향 통과
  84%, 100% { transform: skewX(-14deg) translateX(-115%); }
}
@keyframes wipe-loop-2 {
  0%, 14%   { transform: skewX(-14deg) translateX(-115%); }
  40%, 60%  { transform: skewX(-14deg) translateX(115%); }
  86%, 100% { transform: skewX(-14deg) translateX(-115%); }
}
@keyframes inner-a {
  0%, 20%   { opacity: 1; }
  26%, 70%  { opacity: 0; }
  76%, 100% { opacity: 1; }
}
@keyframes inner-b {
  0%, 20%   { opacity: 0; }
  26%, 70%  { opacity: 1; }
  76%, 100% { opacity: 0; }
}

@media (max-width: 360px) {          // 320×200 아이프레임 대응
  .scene__frame { height: 96px; }
  .scene__name { font-size: 15px; }
  .scene__btn { padding: 4px 16px; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .scene__inner, .scene__btn { transition: none; }
  .scene.is-demo .scene__wipe,
  .scene.is-demo .scene__inner { animation: none; }  // 판 없이 장면만 즉시 바뀐다
  .scene.is-demo .scene__wipe { transform: skewX(-14deg) translateX(-115%); }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.scene {
  display: grid;
  justify-items: center;
  gap: 12px;
}

.scene__check {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.scene__frame {
  position: relative;
  width: min(320px, 90vw);
  height: clamp(96px, 50vh, 172px);
  border-radius: 16px;
  overflow: hidden;
}

.scene__inner {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transition: opacity 220ms linear calc(1s / 2);
}

.scene__inner--a {
  background: linear-gradient(140deg, #2f6df6 0%, #fff7e6 100%);
  opacity: 1;
}

.scene__inner--b {
  background: linear-gradient(140deg, #ff4d1f 0%, #ffd23f 100%);
  opacity: 0;
}

.scene__name {
  margin: 0;
  font-weight: 800;
  font-size: clamp(18px, 5.2vw, 24px);
  font-family: inherit;
  color: #17141a;
}

.scene__wipes {
  position: absolute;
  inset: 0;
}

.scene__wipe {
  position: absolute;
  top: -20%;
  bottom: -20%;
  left: -45%;
  width: 190%;
  background: #ffffff;
  transform: skewX(-14deg) translateX(-115%);
}

.scene__wipe--2 {
  background: rgba(255, 210, 63, 0.92);
}

.scene__btn {
  padding: 8px 20px;
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  font-weight: 700;
  font-size: 13px;
  font-family: inherit;
  color: #ffffff;
  cursor: pointer;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), border-color 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.scene__btn:active {
  transform: scale(0.94);
}

.scene__wipe {
  transition: transform 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.scene__wipe--2 {
  transition-delay: 100ms;
}

#scene-swap:checked ~ .scene__frame .scene__wipe {
  transform: skewX(-14deg) translateX(115%);
}

#scene-swap:checked ~ .scene__frame .scene__inner--a {
  opacity: 0;
}

#scene-swap:checked ~ .scene__frame .scene__inner--b {
  opacity: 1;
}

.scene.is-demo .scene__wipe--1 {
  animation: wipe-loop-1 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.scene.is-demo .scene__wipe--2 {
  animation: wipe-loop-2 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.scene.is-demo .scene__inner--a {
  animation: inner-a 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.scene.is-demo .scene__inner--b {
  animation: inner-b 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes wipe-loop-1 {
  0%, 8% {
    transform: skewX(-14deg) translateX(-115%);
  }
  34% {
    transform: skewX(-14deg) translateX(115%);
  }
  52%, 58% {
    transform: skewX(-14deg) translateX(115%);
  }
  84%, 100% {
    transform: skewX(-14deg) translateX(-115%);
  }
}
@keyframes wipe-loop-2 {
  0%, 14% {
    transform: skewX(-14deg) translateX(-115%);
  }
  40%, 60% {
    transform: skewX(-14deg) translateX(115%);
  }
  86%, 100% {
    transform: skewX(-14deg) translateX(-115%);
  }
}
@keyframes inner-a {
  0%, 20% {
    opacity: 1;
  }
  26%, 70% {
    opacity: 0;
  }
  76%, 100% {
    opacity: 1;
  }
}
@keyframes inner-b {
  0%, 20% {
    opacity: 0;
  }
  26%, 70% {
    opacity: 1;
  }
  76%, 100% {
    opacity: 0;
  }
}
@media (max-width: 360px) {
  .scene__frame {
    height: 96px;
  }
  .scene__name {
    font-size: 15px;
  }
  .scene__btn {
    padding: 4px 16px;
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .scene__inner, .scene__btn {
    transition: none;
  }
  .scene.is-demo .scene__wipe,
  .scene.is-demo .scene__inner {
    animation: none;
  }
  .scene.is-demo .scene__wipe {
    transform: skewX(-14deg) translateX(-115%);
  }
}

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

export type SplitDiagonalSwapProps = {
  sceneA: string;
  sceneB: string;
  swapLabel: string;
  /** 판이 프레임을 통과하는 시간 (기본 1000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function SplitDiagonalSwap({
  sceneA,
  sceneB,
  swapLabel,
  duration = 1000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: SplitDiagonalSwapProps) {
  const [atB, setAtB] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <section className={styles.scene} style={vars} aria-label={`${sceneA} / ${sceneB}`}>
      <div className={styles.frame}>
        <div className={`${styles.inner} ${styles.innerA} ${atB ? styles.innerHide : ""}`}>
          <p className={styles.name}>{sceneA}</p>
        </div>
        <div className={`${styles.inner} ${styles.innerB} ${atB ? styles.innerShow : ""}`}>
          <p className={styles.name}>{sceneB}</p>
        </div>
        <div className={styles.wipes} aria-hidden="true">
          <span className={`${styles.wipe} ${styles.wipe1} ${atB ? styles.wipeGo : ""}`} />
          <span className={`${styles.wipe} ${styles.wipe2} ${atB ? styles.wipeGo : ""}`} />
        </div>
      </div>
      <button type="button" className={styles.btn} onClick={() => setAtB((v) => !v)}>{swapLabel}</button>
    </section>
  );
}