06Popover API menu, zero JS

<main class="stage">
  <div class="anchor is-demo">
    <button class="burger" popovertarget="menu-06" type="button" aria-label="Open menu">
      <span class="bar bar1"></span>
      <span class="bar bar2"></span>
      <span class="bar bar3"></span>
    </button>
    <div id="menu-06" class="menu" popover aria-label="Menu">
      <a class="menu__link" href="#">Home</a>
      <a class="menu__link" href="#">About</a>
      <a class="menu__link" href="#">Products</a>
      <a class="menu__link" href="#">Contact</a>
    </div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 220ms;         // 메뉴가 뜨는 시간
$easing: $ease-pop;       // 살짝 튀며 나타난다
$color: $subject-ink;     // 줄·메뉴 글자 색

@include stage($stage-yellow);

.stage { position: relative; }

// 다른 항목(01~05·07~09)과 같은 자리: 무대 중앙이 아니라 좌상단에 고정한다.
// 무대는 place-items:center 라 버튼이 세로 중앙에 오면, 폰 높이(200px)에서
// 메뉴가 아래로 펼쳐질 자리가 모자라 바닥을 넘친다 (실측: 320x200 폰 높이 넘침 14px, BD9)
.anchor {
  position: absolute; top: clamp(14px, 5vmin, 20px); left: clamp(14px, 5vmin, 20px);
}

.burger {
  position: relative; 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;
}

.bar {
  position: absolute; left: 50%; top: 50%;
  width: clamp(20px, 6.4vmin, 26px); height: 3px; border-radius: 2px;
  background: $color;
  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); }

// popover 속성이 없을 때(데모 기본값)는 anchor 아래 평범한 상자로 그린다
.menu {
  position: absolute; top: calc(100% + 8px); left: 0; right: auto;
  margin: 0; border: 0;
  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; color: $stage-ink; box-shadow: $shadow-raised;
  opacity: 0; transform: translateY(-8px) scale(.96); transform-origin: top left; // 규칙8: 앵커 아래에서 펼침
  transition: opacity $duration $easing, transform $duration $easing;
}
.menu__link { display: block; font-weight: 600; font-size: clamp(11px, 3.6vmin, 13px); line-height: 1; font-family: inherit; color: $stage-ink; text-decoration: none; }

// 진짜 Popover API 로 켜졌을 때는 top layer 위, 같은 자리에 뜨게 좌표만 다시 잡는다
.menu:popover-open {
  position: fixed; inset: auto;
  opacity: 1; transform: translateY(0) scale(1);
}

.anchor.is-demo .bar1 { animation: bar1-loop $dur-loop $easing infinite; }
.anchor.is-demo .bar2 { animation: bar2-loop $dur-loop $easing infinite; }
.anchor.is-demo .bar3 { animation: bar3-loop $dur-loop $easing infinite; }
.anchor.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(0) rotate(45deg); }
  70%  { transform: translate(-50%, -50%) translateY(0) rotate(45deg); }
  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); opacity: 1; }
  15%  { transform: translate(-50%, -50%) scaleX(0); opacity: 0; }
  70%  { transform: translate(-50%, -50%) scaleX(0); opacity: 0; }
  85%  { transform: translate(-50%, -50%) scaleX(1); opacity: 1; }
  100% { transform: translate(-50%, -50%) scaleX(1); opacity: 1; }
}
@keyframes bar3-loop {
  0%   { transform: translate(-50%, -50%) translateY(7px) rotate(0deg); }
  15%  { transform: translate(-50%, -50%) translateY(0) rotate(-45deg); }
  70%  { transform: translate(-50%, -50%) translateY(0) rotate(-45deg); }
  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) {
  .anchor.is-demo .bar1, .anchor.is-demo .bar2, .anchor.is-demo .bar3, .anchor.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: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  position: relative;
}

.anchor {
  position: absolute;
  top: clamp(14px, 5vmin, 20px);
  left: clamp(14px, 5vmin, 20px);
}

.burger {
  position: relative;
  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;
  left: 50%;
  top: 50%;
  width: clamp(20px, 6.4vmin, 26px);
  height: 3px;
  border-radius: 2px;
  background: #17141a;
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1), opacity 220ms cubic-bezier(0.2, 1.4, 0.4, 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: calc(100% + 8px);
  left: 0;
  right: auto;
  margin: 0;
  border: 0;
  display: grid;
  gap: clamp(6px, 2.2vmin, 10px);
  width: clamp(120px, 40vmin, 160px);
  padding: clamp(12px, 4vmin, 16px);
  border-radius: 16px;
  background: #ffffff;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  opacity: 0;
  transform: translateY(-8px) scale(0.96);
  transform-origin: top left;
  transition: opacity 220ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

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

.menu:popover-open {
  position: fixed;
  inset: auto;
  opacity: 1;
  transform: translateY(0) scale(1);
}

.anchor.is-demo .bar1 {
  animation: bar1-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.anchor.is-demo .bar2 {
  animation: bar2-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.anchor.is-demo .bar3 {
  animation: bar3-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.anchor.is-demo .menu {
  animation: menu-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes bar1-loop {
  0% {
    transform: translate(-50%, -50%) translateY(-7px) rotate(0deg);
  }
  15% {
    transform: translate(-50%, -50%) translateY(0) rotate(45deg);
  }
  70% {
    transform: translate(-50%, -50%) translateY(0) rotate(45deg);
  }
  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);
    opacity: 1;
  }
  15% {
    transform: translate(-50%, -50%) scaleX(0);
    opacity: 0;
  }
  70% {
    transform: translate(-50%, -50%) scaleX(0);
    opacity: 0;
  }
  85% {
    transform: translate(-50%, -50%) scaleX(1);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scaleX(1);
    opacity: 1;
  }
}
@keyframes bar3-loop {
  0% {
    transform: translate(-50%, -50%) translateY(7px) rotate(0deg);
  }
  15% {
    transform: translate(-50%, -50%) translateY(0) rotate(-45deg);
  }
  70% {
    transform: translate(-50%, -50%) translateY(0) rotate(-45deg);
  }
  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) {
  .anchor.is-demo .bar1, .anchor.is-demo .bar2, .anchor.is-demo .bar3, .anchor.is-demo .menu {
    animation: none;
  }
  .bar, .menu {
    transition-duration: 1ms;
  }
}

// 데모는 anchor 에 .is-demo 를 걸어 keyframes 로 반복한다. 실제 열고 닫는 동작은
// popover 속성 하나가 다 한다 — JS 는 데모 반복을 멈추는 한 줄뿐이다.
(function () {
  var anchor = document.querySelector('.anchor');
  var burger = document.querySelector('.burger');
  var menu = document.querySelector('.menu');
  burger.addEventListener('click', function () { anchor.classList.remove('is-demo'); });
  menu.addEventListener('toggle', function (e) {
    burger.setAttribute('aria-label', e.newState === 'open' ? 'Close menu' : 'Open menu');
  });
})();

import { useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./PopoverMenu.module.scss";

export type PopoverMenuProps = {
  links: string[];
  openLabel: string;
  closeLabel: string;
  label: string;
  /** 메뉴가 뜨는 시간 (기본 220ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function PopoverMenu({
  links,
  openLabel,
  closeLabel,
  label,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#17141a",
}: PopoverMenuProps) {
  const ref = useRef<HTMLDivElement>(null);
  const [open, setOpen] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function toggle() {
    const el = ref.current as (HTMLDivElement & { showPopover?: () => void; hidePopover?: () => void }) | null;
    if (el) {
      if (!el.hasAttribute("popover")) el.setAttribute("popover", "manual");
      if (open) el.hidePopover?.();
      else el.showPopover?.();
    }
    setOpen((v) => !v);
  }

  return (
    <div className={styles.anchor} style={vars}>
      <button type="button" className={styles.burger} aria-label={open ? closeLabel : openLabel} onClick={toggle}>
        <span className={`${styles.bar} ${open ? `${styles.bar1} ${styles.isOpen}` : styles.bar1}`} />
        <span className={`${styles.bar} ${open ? `${styles.bar2} ${styles.isOpen}` : styles.bar2}`} />
        <span className={`${styles.bar} ${open ? `${styles.bar3} ${styles.isOpen}` : styles.bar3}`} />
      </button>
      <div ref={ref} className={open ? `${styles.menu} ${styles.isOpen}` : styles.menu} aria-label={label}>
        {links.map((l) => (
          <a key={l} className={styles.menuLink} href="#">
            {l}
          </a>
        ))}
      </div>
    </div>
  );
}