03Biến thành mũi tên

<main class="stage is-demo">
  <button class="burger" type="button" aria-label="Mở menu">
    <span class="bar bar1"></span>
    <span class="bar bar2"></span>
    <span class="bar bar3"></span>
  </button>
  <nav class="menu" aria-hidden="true">
    <a class="menu__link" href="#">Trang chủ</a>
    <a class="menu__link" href="#">Giới thiệu</a>
    <a class="menu__link" href="#">Sản phẩm</a>
    <a class="menu__link" href="#">Liên hệ</a>
  </nav>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 250ms;          // 화살표로 좁아지는 시간
$easing: $ease-spring;
$color: $subject-cream;    // 줄·메뉴 글자 색

@include stage($stage-orange);

.stage { position: relative; }

.burger {
  position: absolute; top: clamp(14px, 5vmin, 20px); left: clamp(14px, 5vmin, 20px);
  z-index: 2; width: clamp(34px, 10vmin, 42px); height: clamp(34px, 10vmin, 42px);
  border: 0; border-radius: $r-control; background: transparent;
  padding: 0; cursor: pointer; -webkit-tap-highlight-color: transparent;
}

// 오른쪽 끝을 축으로 회전시켜 왼쪽 끝이 모이면 "<" 모양이 된다
.bar {
  position: absolute; right: 50%; top: 50%;
  width: clamp(20px, 6.4vmin, 26px); height: 3px; border-radius: 2px;
  background: $color;
  transform-origin: right center; // 규칙8: 오른쪽 끝축 막대 회전
  transition: transform $duration $easing, opacity $duration $easing;
}
.bar1 { transform: translate(50%, -50%) translateY(-7px) rotate(0deg); }
.bar2 { transform: translate(50%, -50%) scaleX(1); opacity: 1; }
.bar3 { transform: translate(50%, -50%) translateY(7px) rotate(0deg); }

.menu {
  position: absolute; top: clamp(52px, 16vmin, 64px); left: clamp(14px, 5vmin, 20px);
  display: grid; gap: clamp(6px, 2.2vmin, 10px);
  width: clamp(120px, 40vmin, 160px);
  padding: clamp(12px, 4vmin, 16px);
  border-radius: $r-card; background: $stage-paper; box-shadow: $shadow-raised;
  opacity: 0; transform: translateY(-8px) scale(.96); transform-origin: top left; // 규칙8: 버튼 모서리에서 펼침
  pointer-events: none;
  transition: opacity $duration $easing, transform $duration $easing;
}
.menu__link { font-weight: 600; font-size: clamp(11px, 3.6vmin, 13px); line-height: 1; font-family: inherit; color: $stage-ink; text-decoration: none; }

.stage.is-open .bar1 { transform: translate(50%, -50%) translateY(-3px) rotate(-35deg); }
.stage.is-open .bar2 { transform: translate(50%, -50%) scaleX(.7); opacity: 1; }
.stage.is-open .bar3 { transform: translate(50%, -50%) translateY(3px) rotate(35deg); }
.stage.is-open .menu { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }

.stage.is-demo .bar1  { animation: bar1-loop $dur-loop $easing infinite; }
.stage.is-demo .bar2  { animation: bar2-loop $dur-loop $easing infinite; }
.stage.is-demo .bar3  { animation: bar3-loop $dur-loop $easing infinite; }
.stage.is-demo .menu  { animation: menu-loop $dur-loop $easing infinite; }

@keyframes bar1-loop {
  0%   { transform: translate(50%, -50%) translateY(-7px) rotate(0deg); }
  15%  { transform: translate(50%, -50%) translateY(-3px) rotate(-35deg); }
  70%  { transform: translate(50%, -50%) translateY(-3px) rotate(-35deg); }
  85%  { transform: translate(50%, -50%) translateY(-7px) rotate(0deg); }
  100% { transform: translate(50%, -50%) translateY(-7px) rotate(0deg); }
}
@keyframes bar2-loop {
  0%   { transform: translate(50%, -50%) scaleX(1); }
  15%  { transform: translate(50%, -50%) scaleX(.7); }
  70%  { transform: translate(50%, -50%) scaleX(.7); }
  85%  { transform: translate(50%, -50%) scaleX(1); }
  100% { transform: translate(50%, -50%) scaleX(1); }
}
@keyframes bar3-loop {
  0%   { transform: translate(50%, -50%) translateY(7px) rotate(0deg); }
  15%  { transform: translate(50%, -50%) translateY(3px) rotate(35deg); }
  70%  { transform: translate(50%, -50%) translateY(3px) rotate(35deg); }
  85%  { transform: translate(50%, -50%) translateY(7px) rotate(0deg); }
  100% { transform: translate(50%, -50%) translateY(7px) rotate(0deg); }
}
@keyframes menu-loop {
  0%   { opacity: 0; transform: translateY(-8px) scale(.96); }
  15%  { opacity: 1; transform: translateY(0) scale(1); }
  70%  { opacity: 1; transform: translateY(0) scale(1); }
  85%  { opacity: 0; transform: translateY(-8px) scale(.96); }
  100% { opacity: 0; transform: translateY(-8px) scale(.96); }
}

// ── 접근성 ─────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .bar1, .stage.is-demo .bar2, .stage.is-demo .bar3, .stage.is-demo .menu { animation: none; }
  .bar, .menu { transition-duration: 1ms; }
}

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);
}

.stage {
  position: relative;
}

.burger {
  position: absolute;
  top: clamp(14px, 5vmin, 20px);
  left: clamp(14px, 5vmin, 20px);
  z-index: 2;
  width: clamp(34px, 10vmin, 42px);
  height: clamp(34px, 10vmin, 42px);
  border: 0;
  border-radius: 12px;
  background: transparent;
  padding: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.bar {
  position: absolute;
  right: 50%;
  top: 50%;
  width: clamp(20px, 6.4vmin, 26px);
  height: 3px;
  border-radius: 2px;
  background: #fff7e6;
  transform-origin: right center;
  transition: transform 250ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 250ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.bar1 {
  transform: translate(50%, -50%) translateY(-7px) rotate(0deg);
}

.bar2 {
  transform: translate(50%, -50%) scaleX(1);
  opacity: 1;
}

.bar3 {
  transform: translate(50%, -50%) translateY(7px) rotate(0deg);
}

.menu {
  position: absolute;
  top: clamp(52px, 16vmin, 64px);
  left: clamp(14px, 5vmin, 20px);
  display: grid;
  gap: clamp(6px, 2.2vmin, 10px);
  width: clamp(120px, 40vmin, 160px);
  padding: clamp(12px, 4vmin, 16px);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  transform: translateY(-8px) scale(0.96);
  transform-origin: top left;
  pointer-events: none;
  transition: opacity 250ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 250ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.menu__link {
  font-weight: 600;
  font-size: clamp(11px, 3.6vmin, 13px);
  line-height: 1;
  font-family: inherit;
  color: #17141a;
  text-decoration: none;
}

.stage.is-open .bar1 {
  transform: translate(50%, -50%) translateY(-3px) rotate(-35deg);
}

.stage.is-open .bar2 {
  transform: translate(50%, -50%) scaleX(0.7);
  opacity: 1;
}

.stage.is-open .bar3 {
  transform: translate(50%, -50%) translateY(3px) rotate(35deg);
}

.stage.is-open .menu {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.stage.is-demo .bar1 {
  animation: bar1-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .bar2 {
  animation: bar2-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.stage.is-demo .bar3 {
  animation: bar3-loop 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

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

@keyframes bar1-loop {
  0% {
    transform: translate(50%, -50%) translateY(-7px) rotate(0deg);
  }
  15% {
    transform: translate(50%, -50%) translateY(-3px) rotate(-35deg);
  }
  70% {
    transform: translate(50%, -50%) translateY(-3px) rotate(-35deg);
  }
  85% {
    transform: translate(50%, -50%) translateY(-7px) rotate(0deg);
  }
  100% {
    transform: translate(50%, -50%) translateY(-7px) rotate(0deg);
  }
}
@keyframes bar2-loop {
  0% {
    transform: translate(50%, -50%) scaleX(1);
  }
  15% {
    transform: translate(50%, -50%) scaleX(0.7);
  }
  70% {
    transform: translate(50%, -50%) scaleX(0.7);
  }
  85% {
    transform: translate(50%, -50%) scaleX(1);
  }
  100% {
    transform: translate(50%, -50%) scaleX(1);
  }
}
@keyframes bar3-loop {
  0% {
    transform: translate(50%, -50%) translateY(7px) rotate(0deg);
  }
  15% {
    transform: translate(50%, -50%) translateY(3px) rotate(35deg);
  }
  70% {
    transform: translate(50%, -50%) translateY(3px) rotate(35deg);
  }
  85% {
    transform: translate(50%, -50%) translateY(7px) rotate(0deg);
  }
  100% {
    transform: translate(50%, -50%) translateY(7px) rotate(0deg);
  }
}
@keyframes menu-loop {
  0% {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
  15% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  70% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  85% {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
  100% {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .bar1, .stage.is-demo .bar2, .stage.is-demo .bar3, .stage.is-demo .menu {
    animation: none;
  }
  .bar, .menu {
    transition-duration: 1ms;
  }
}

(function () {
  var stage = document.querySelector('.stage');
  var burger = document.querySelector('.burger');
  var open = false;
  burger.addEventListener('click', function () {
    stage.classList.remove('is-demo');
    open = !open;
    stage.classList.toggle('is-open', open);
    burger.setAttribute('aria-label', open ? 'Đóng menu' : 'Mở menu');
  });
})();

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

export type ArrowMorphProps = {
  links: string[];
  openLabel: string;
  closeLabel: string;
  /** 화살표로 좁아지는 시간 (기본 250ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function ArrowMorph({
  links,
  openLabel,
  closeLabel,
  duration = 250,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#fff7e6",
}: ArrowMorphProps) {
  const [open, setOpen] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const cls = (base: string) => (open ? `${base} ${styles.isOpen}` : base);

  return (
    <div className={styles.stage} style={vars}>
      <button
        type="button"
        className={cls(styles.burger)}
        aria-label={open ? closeLabel : openLabel}
        onClick={() => setOpen((v) => !v)}
      >
        <span className={`${styles.bar} ${styles.bar1}`} />
        <span className={`${styles.bar} ${styles.bar2}`} />
        <span className={`${styles.bar} ${styles.bar3}`} />
      </button>
      <nav className={cls(styles.menu)} aria-hidden={!open}>
        {links.map((label) => (
          <a key={label} className={styles.menuLink} href="#">
            {label}
          </a>
        ))}
      </nav>
    </div>
  );
}