09Hai mũi tên bắt chéo

<main class="stage">
  <div class="xs-wrap" aria-hidden="true">
    <span class="xs-arrow xs-arrow--a"></span>
    <span class="xs-arrow xs-arrow--b"></span>
    <span class="xs-trail xs-trail--a"></span>
    <span class="xs-trail xs-trail--b"></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1.8s;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

.xs-wrap {
  position: relative;
  width: 40px;
  height: 40px;
}

.xs-arrow {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 16px;
  height: 16px;
  border-top: 3px solid;
  border-right: 3px solid;
}

// 두 화살표가 같은 대각선 위에서 서로 반대 방향으로 미끄러지며 자리를 맞바꾸듯 교차한다. 46%에서 오버슛했다 50%에서 정착한다
.xs-arrow--a { border-color: $color; transform: translate(-6px, 6px) rotate(-45deg); }
.xs-arrow--b { border-color: $subject-cream; transform: translate(6px, -6px) rotate(135deg); }

@keyframes xs-swap-a {
  0%, 100% { transform: translate(-6px, 6px) rotate(-45deg); }
  46%      { transform: translate(8px, -8px) rotate(-45deg); }
  50%      { transform: translate(6px, -6px) rotate(-45deg); }
}
@keyframes xs-swap-b {
  0%, 100% { transform: translate(6px, -6px) rotate(135deg); }
  46%      { transform: translate(-8px, 8px) rotate(135deg); }
  50%      { transform: translate(-6px, 6px) rotate(135deg); }
}
.xs-arrow--a { animation: xs-swap-a $duration $easing infinite; }
.xs-arrow--b { animation: xs-swap-b $duration $easing infinite; }

// 트레일 파티클 — 교차하는 화살표 각각 뒤로 작은 점이 살짝 지연되어 흐리게 따라붙는다
.xs-trail {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  opacity: 0;
}
.xs-trail--a { background: $color; }
.xs-trail--b { background: $subject-cream; }
@keyframes xs-trail-a {
  0%, 100% { opacity: 0; transform: translate(-3px, 3px) scale(.6); }
  50%      { opacity: .35; transform: translate(3px, -3px) scale(1); }
}
@keyframes xs-trail-b {
  0%, 100% { opacity: 0; transform: translate(3px, -3px) scale(.6); }
  50%      { opacity: .35; transform: translate(-3px, 3px) scale(1); }
}
.xs-trail--a { animation: xs-trail-a $duration $easing 60ms infinite; }
.xs-trail--b { animation: xs-trail-b $duration $easing 60ms infinite; }

@media (prefers-reduced-motion: reduce) {
  .xs-arrow--a { animation: none !important; transform: translate(-6px, 6px) rotate(-45deg) !important; }
  .xs-arrow--b { animation: none !important; transform: translate(6px, -6px) rotate(135deg) !important; }
  .xs-trail--a, .xs-trail--b { animation: none !important; opacity: 0 !important; }
}

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);
}

.xs-wrap {
  position: relative;
  width: 40px;
  height: 40px;
}

.xs-arrow {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 16px;
  height: 16px;
  border-top: 3px solid;
  border-right: 3px solid;
}

.xs-arrow--a {
  border-color: #2f6df6;
  transform: translate(-6px, 6px) rotate(-45deg);
}

.xs-arrow--b {
  border-color: #fff7e6;
  transform: translate(6px, -6px) rotate(135deg);
}

@keyframes xs-swap-a {
  0%, 100% {
    transform: translate(-6px, 6px) rotate(-45deg);
  }
  46% {
    transform: translate(8px, -8px) rotate(-45deg);
  }
  50% {
    transform: translate(6px, -6px) rotate(-45deg);
  }
}
@keyframes xs-swap-b {
  0%, 100% {
    transform: translate(6px, -6px) rotate(135deg);
  }
  46% {
    transform: translate(-8px, 8px) rotate(135deg);
  }
  50% {
    transform: translate(-6px, 6px) rotate(135deg);
  }
}
.xs-arrow--a {
  animation: xs-swap-a 1.8s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.xs-arrow--b {
  animation: xs-swap-b 1.8s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.xs-trail {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  opacity: 0;
}

.xs-trail--a {
  background: #2f6df6;
}

.xs-trail--b {
  background: #fff7e6;
}

@keyframes xs-trail-a {
  0%, 100% {
    opacity: 0;
    transform: translate(-3px, 3px) scale(0.6);
  }
  50% {
    opacity: 0.35;
    transform: translate(3px, -3px) scale(1);
  }
}
@keyframes xs-trail-b {
  0%, 100% {
    opacity: 0;
    transform: translate(3px, -3px) scale(0.6);
  }
  50% {
    opacity: 0.35;
    transform: translate(-3px, 3px) scale(1);
  }
}
.xs-trail--a {
  animation: xs-trail-a 1.8s cubic-bezier(0.2, 0.8, 0.2, 1) 60ms infinite;
}

.xs-trail--b {
  animation: xs-trail-b 1.8s cubic-bezier(0.2, 0.8, 0.2, 1) 60ms infinite;
}

@media (prefers-reduced-motion: reduce) {
  .xs-arrow--a {
    animation: none !important;
    transform: translate(-6px, 6px) rotate(-45deg) !important;
  }
  .xs-arrow--b {
    animation: none !important;
    transform: translate(6px, -6px) rotate(135deg) !important;
  }
  .xs-trail--a, .xs-trail--b {
    animation: none !important;
    opacity: 0 !important;
  }
}

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

export interface DoubleArrowSwapProps {
  duration?: string;
  easing?: string;
  color?: string;
}

export default function DoubleArrowSwap({
  duration = "1.8s",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#2f6df6",
}: DoubleArrowSwapProps) {
  const style = { "--duration": duration, "--easing": easing, "--color": color } as CSSProperties;
  return (
    <div className={styles.wrap} style={style} aria-hidden="true">
      <span className={`${styles.arrow} ${styles.a}`} />
      <span className={`${styles.arrow} ${styles.b}`} />
      <span className={`${styles.trail} ${styles.trailA}`} />
      <span className={`${styles.trail} ${styles.trailB}`} />
    </div>
  );
}