07Mũi tên đẩy

<main class="stage">
  <button class="btn is-demo" type="button">Tiếp theo<span class="arrow" aria-hidden="true"><i class="arrow__line"></i><i class="arrow__head"></i></span></button>
</main>

// ── 변수 3개 ──────────────────────────────────────────
$push: 8px;                                      // 화살표가 얼마나 밀리나
$duration: 240ms;
$color: #17141a;

html, body { margin: 0; overflow: hidden; }          // iframe 안에서 스크롤바가 생기지 않게 (실측 2026-09-09: body 여백 8px 이 100vh 를 넘겼다)
.stage { min-height: 100vh; display: grid; place-items: center; margin: 0; background: #17141a; font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  border: 0;
  border-radius: 14px;
  padding: 20px 26px 20px 40px;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  font-family: inherit;
  color: $color;
  background: #fff7e6;
  cursor: pointer;
}

// 화살표 = 선 + 머리. 선은 늘어나고(scaleX) 머리는 밀린다(translateX)
.arrow { position: relative; width: 26px; height: 16px; display: block; }
.arrow__line, .arrow__head { position: absolute; display: block; background: currentColor; }
.arrow__line { left: 0; top: 7px; width: 100%; height: 2.5px; transform-origin: left; transform: scaleX(.55); transition: transform $duration cubic-bezier(.2, .8, .2, 1); } // 규칙8: 화살표 선 왼쪽으로 늘어남
.arrow__head { right: 0; top: 2px; width: 12px; height: 12px; background: transparent; border-top: 2.5px solid currentColor; border-right: 2.5px solid currentColor; transform: rotate(45deg); transition: transform $duration cubic-bezier(.2, .8, .2, 1); }

.btn:hover .arrow__line, .btn:focus-visible .arrow__line { transform: scaleX(1); }
.btn:hover .arrow__head, .btn:focus-visible .arrow__head { transform: rotate(45deg) translate($push * .7, -$push * .7); }

.btn.is-demo .arrow__line { animation: line-loop 2s cubic-bezier(.2, .8, .2, 1) infinite; }
.btn.is-demo .arrow__head { animation: head-loop 2s cubic-bezier(.2, .8, .2, 1) infinite; }

@keyframes line-loop { 0%, 20% { transform: scaleX(.55); } 45%, 70% { transform: scaleX(1); } 100% { transform: scaleX(.55); } }
@keyframes head-loop { 0%, 20% { transform: rotate(45deg); } 45%, 70% { transform: rotate(45deg) translate($push * .7, -$push * .7); } 100% { transform: rotate(45deg); } }

@media (prefers-reduced-motion: reduce) {
  .arrow__line, .arrow__head { transition: none; animation: none !important; }
}

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

.stage {
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  border: 0;
  border-radius: 14px;
  padding: 20px 26px 20px 40px;
  font-weight: 800;
  font-size: 20px;
  line-height: 1;
  font-family: inherit;
  color: #17141a;
  background: #fff7e6;
  cursor: pointer;
}

.arrow {
  position: relative;
  width: 26px;
  height: 16px;
  display: block;
}

.arrow__line, .arrow__head {
  position: absolute;
  display: block;
  background: currentColor;
}

.arrow__line {
  left: 0;
  top: 7px;
  width: 100%;
  height: 2.5px;
  transform-origin: left;
  transform: scaleX(0.55);
  transition: transform 240ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.arrow__head {
  right: 0;
  top: 2px;
  width: 12px;
  height: 12px;
  background: transparent;
  border-top: 2.5px solid currentColor;
  border-right: 2.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 240ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.btn:hover .arrow__line, .btn:focus-visible .arrow__line {
  transform: scaleX(1);
}

.btn:hover .arrow__head, .btn:focus-visible .arrow__head {
  transform: rotate(45deg) translate(5.6px, -5.6px);
}

.btn.is-demo .arrow__line {
  animation: line-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.btn.is-demo .arrow__head {
  animation: head-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes line-loop {
  0%, 20% {
    transform: scaleX(0.55);
  }
  45%, 70% {
    transform: scaleX(1);
  }
  100% {
    transform: scaleX(0.55);
  }
}
@keyframes head-loop {
  0%, 20% {
    transform: rotate(45deg);
  }
  45%, 70% {
    transform: rotate(45deg) translate(5.6px, -5.6px);
  }
  100% {
    transform: rotate(45deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .arrow__line, .arrow__head {
    transition: none;
    animation: none !important;
  }
}

document.querySelectorAll('.btn').forEach(function (b) { b.addEventListener('pointerenter', function () { b.classList.remove('is-demo'); }); });

import type { CSSProperties, ReactNode } from "react";
import styles from "./ArrowButton.module.scss";

export type ArrowButtonProps = { children: ReactNode; push?: number; duration?: number; onClick?: () => void };

export default function ArrowButton({ children, push = 8, duration = 240, onClick }: ArrowButtonProps) {
  const vars = { "--push": `${push}px`, "--duration": `${duration}ms` } as CSSProperties;
  return (
    <button type="button" className={styles.btn} style={vars} onClick={onClick}>
      {children}
      <span className={styles.arrow} aria-hidden="true"><i className={styles.line} /><i className={styles.head} /></span>
    </button>
  );
}