01Play/pause morph button

<main class="stage">
  <figure class="pl is-demo is-playing" id="pl">
    <div class="pl__screen">
      <div class="pl__stripes" aria-hidden="true"></div>
      <div class="pl__world" aria-hidden="true"><span class="pl__sun"></span><span class="pl__hill pl__hill--a"></span><span class="pl__hill pl__hill--b"></span></div>
      <span class="pl__clock" id="clock">0:12</span>
      <span class="pl__badge">3:00</span>
      <div class="pl__bar">
        <button class="pp" type="button" id="pp" aria-label="Pause">
          <span class="pp__ring" aria-hidden="true"></span>
          <span class="pp__ic pp__ic--play" aria-hidden="true"><svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M228.23 134.69L84.15 222.81A8 8 0 0 1 72 216.12V39.88a8 8 0 0 1 12.15-6.69l144.08 88.12a7.82 7.82 0 0 1 0 13.38" opacity=".2"/><path d="M232.4 114.49L88.32 26.35a16 16 0 0 0-16.2-.3A15.86 15.86 0 0 0 64 39.87v176.26A15.94 15.94 0 0 0 80 232a16.07 16.07 0 0 0 8.36-2.35l144.04-88.14a15.81 15.81 0 0 0 0-27ZM80 215.94V40l143.83 88Z"/></g></svg></span>
          <span class="pp__ic pp__ic--pause" aria-hidden="true"><svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M208 48v160a8 8 0 0 1-8 8h-40a8 8 0 0 1-8-8V48a8 8 0 0 1 8-8h40a8 8 0 0 1 8 8M96 40H56a8 8 0 0 0-8 8v160a8 8 0 0 0 8 8h40a8 8 0 0 0 8-8V48a8 8 0 0 0-8-8" opacity=".2"/><path d="M200 32h-40a16 16 0 0 0-16 16v160a16 16 0 0 0 16 16h40a16 16 0 0 0 16-16V48a16 16 0 0 0-16-16m0 176h-40V48h40ZM96 32H56a16 16 0 0 0-16 16v160a16 16 0 0 0 16 16h40a16 16 0 0 0 16-16V48a16 16 0 0 0-16-16m0 176H56V48h40Z"/></g></svg></span>
        </button>
        <span class="pl__time"><b id="t-now">0:12</b> / 3:00</span>
      </div>
      <span class="pl__fillwrap" aria-hidden="true"><span class="pl__fill" id="fill"></span></span>
    </div>
  </figure>
</main>

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

$duration: $dur-quick;
$easing: $ease-pop;
$color: $subject-blue;

@include stage($stage-ink);

.pl {
  position: relative;
  box-sizing: border-box;
  width: min(392px, 92vw);
  margin: 0;
  border-radius: $r-card;
  background: $subject-cream;
  box-shadow: $shadow-raised;
  overflow: hidden;
}
.pl__screen {
  position: relative;
  height: clamp(96px, 26vw, 140px);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(47, 109, 246, .32), rgba(255, 247, 230, .96));
}
.pl__stripes {
  position: absolute;
  inset: 0 -72px;
  background: repeating-linear-gradient(90deg, rgba(23, 20, 26, .14) 0 12px, transparent 12px 32px);
  animation-name: pl-pan;
  animation-duration: $dur-loop;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes pl-pan { from { transform: translateX(0); } to { transform: translateX(-64px); } }
.pl__world { position: absolute; inset: 0; }
.pl__sun {
  position: absolute; right: 18%; top: 14%;
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(255, 210, 63, .95);
  box-shadow: 0 0 0 8px rgba(255, 210, 63, .25);
}
.pl__hill { position: absolute; bottom: -46%; height: 82%; border-radius: 50%; }
.pl__hill--a { left: -14%; width: 72%; background: rgba(23, 20, 26, .15); }
.pl__hill--b { right: -18%; width: 62%; background: rgba(23, 20, 26, .09); }

.pl__clock {
  position: absolute; left: $sp-2; top: $sp-2;
  padding: $sp-1 $sp-2;
  border-radius: $r-xs;
  background: rgba(23, 20, 26, .62);
  color: #fff;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px; line-height: 16px; font-weight: 700;
}
.pl__badge {
  position: absolute; right: $sp-2; top: $sp-2;
  padding: $sp-1 $sp-2;
  border-radius: $r-xs;
  background: rgba(23, 20, 26, .62);
  color: rgba(255, 255, 255, .85);
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 10px; line-height: 14px; font-weight: 600;
}
.pl__bar {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; align-items: center; gap: $sp-2;
  padding: 0 $sp-2 calc(#{$sp-2} + 8px);
}
.pl__time {
  color: $subject-ink;   // 화면 아래쪽은 크림이라 흰 글자가 1.35~2.10:1 이었다 — 잉크로 8.69~13.49:1
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px; line-height: 14px; font-weight: 600;
  text-shadow: 0 1px 2px rgba(255, 247, 230, .6);
}
.pl__time b { font-weight: 700; }

.pp {
  position: relative;
  box-sizing: border-box;
  width: 38px; height: 38px;
  flex: 0 0 auto;
  display: inline-flex; align-items: center; justify-content: center;
  border: 0;
  border-radius: 50%;
  background: $color;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 6px 14px rgba(47, 109, 246, .45);
  transition: transform $duration $easing;
}
.pp:hover { transform: scale(1.06); }
.pp:active { transform: scale(.94); }
.pp:focus-visible { outline: 2px solid $stage-yellow; outline-offset: 2px; }
.pp__ic {
  position: absolute; inset: 0;
  display: inline-flex; align-items: center; justify-content: center;
  transition: opacity $duration $easing, transform $duration $easing;
}
.pp__ic--pause { opacity: 0; transform: rotate(120deg) scale(.3); }
.pl.is-playing .pp__ic--play { opacity: 0; transform: rotate(-120deg) scale(.3); }
.pl.is-playing .pp__ic--pause { opacity: 1; transform: none; }

.pp__ring {
  position: absolute; inset: 0;
  border: 2px solid rgba(255, 255, 255, .8);
  border-radius: 50%;
  opacity: 0;
  transform: scale(1);
}

.pl__fillwrap { position: absolute; left: 0; right: 0; bottom: 0; height: 6px; background: rgba(255, 255, 255, .28); }
.pl__fill {
  display: block; height: 100%;
  background: $color;
  transform-origin: left center; // 규칙8: 좌변서 차오름
  transform: scaleX(.07);
}

// ── 자동 루프: 재생 중(일시정지 아이콘) → 멈춤(재생 아이콘) → 다시 재생. 원은 상태가 바뀌는 순간마다 한 번 퍼진다 ──
.pl.is-demo .pp__ic--play {
  animation-name: pp-play; animation-duration: $dur-loop;
  animation-timing-function: $easing; animation-iteration-count: infinite;
}
.pl.is-demo .pp__ic--pause {
  animation-name: pp-pause; animation-duration: $dur-loop;
  animation-timing-function: $easing; animation-iteration-count: infinite;
}
.pl.is-demo .pp__ring {
  animation-name: pp-ring; animation-duration: $dur-loop;
  animation-timing-function: ease-out; animation-iteration-count: infinite;
}
.pl.is-demo .pl__fill {
  animation-name: pp-fill; animation-duration: $dur-loop;
  animation-timing-function: linear; animation-iteration-count: infinite;
}
@keyframes pp-play {
  0%, 38% { opacity: 0; transform: rotate(-120deg) scale(.3); }
  50%, 78% { opacity: 1; transform: none; }
  90%, 100% { opacity: 0; transform: rotate(-120deg) scale(.3); }
}
@keyframes pp-pause {
  0%, 38% { opacity: 1; transform: none; }
  50%, 78% { opacity: 0; transform: rotate(120deg) scale(.3); }
  90%, 100% { opacity: 1; transform: none; }
}
@keyframes pp-ring {
  0%, 36% { opacity: 0; transform: scale(.9); }
  42% { opacity: .9; }
  56% { opacity: 0; transform: scale(1.9); }
  76% { opacity: 0; transform: scale(.9); }
  82% { opacity: .9; }
  96%, 100% { opacity: 0; transform: scale(1.9); }
}
@keyframes pp-fill {
  0% { transform: scaleX(.07); }
  38% { transform: scaleX(.3); }
  50%, 78% { transform: scaleX(.3); }
  90%, 100% { transform: scaleX(.07); }
}

@media (prefers-reduced-motion: reduce) {
  .pl.is-demo .pp__ic--play, .pl.is-demo .pp__ic--pause, .pl.is-demo .pp__ring,
  .pl.is-demo .pl__fill, .pl__stripes { animation: none !important; }
  .pp, .pp__ic { transition: none; }
}

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);
}

.pl {
  position: relative;
  box-sizing: border-box;
  width: min(392px, 92vw);
  margin: 0;
  border-radius: 16px;
  background: #fff7e6;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  overflow: hidden;
}

.pl__screen {
  position: relative;
  height: clamp(96px, 26vw, 140px);
  overflow: hidden;
  background: linear-gradient(180deg, rgba(47, 109, 246, 0.32), rgba(255, 247, 230, 0.96));
}

.pl__stripes {
  position: absolute;
  inset: 0 -72px;
  background: repeating-linear-gradient(90deg, rgba(23, 20, 26, 0.14) 0 12px, transparent 12px 32px);
  animation-name: pl-pan;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes pl-pan {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-64px);
  }
}
.pl__world {
  position: absolute;
  inset: 0;
}

.pl__sun {
  position: absolute;
  right: 18%;
  top: 14%;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 210, 63, 0.95);
  box-shadow: 0 0 0 8px rgba(255, 210, 63, 0.25);
}

.pl__hill {
  position: absolute;
  bottom: -46%;
  height: 82%;
  border-radius: 50%;
}

.pl__hill--a {
  left: -14%;
  width: 72%;
  background: rgba(23, 20, 26, 0.15);
}

.pl__hill--b {
  right: -18%;
  width: 62%;
  background: rgba(23, 20, 26, 0.09);
}

.pl__clock {
  position: absolute;
  left: 8px;
  top: 8px;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(23, 20, 26, 0.62);
  color: #fff;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 16px;
  font-weight: 700;
}

.pl__badge {
  position: absolute;
  right: 8px;
  top: 8px;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(23, 20, 26, 0.62);
  color: rgba(255, 255, 255, 0.85);
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 10px;
  line-height: 14px;
  font-weight: 600;
}

.pl__bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px calc(8px + 8px);
}

.pl__time {
  color: #17141a;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 14px;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(255, 247, 230, 0.6);
}

.pl__time b {
  font-weight: 700;
}

.pp {
  position: relative;
  box-sizing: border-box;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 50%;
  background: #2f6df6;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 6px 14px rgba(47, 109, 246, 0.45);
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.pp:hover {
  transform: scale(1.06);
}

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

.pp:focus-visible {
  outline: 2px solid #ffd23f;
  outline-offset: 2px;
}

.pp__ic {
  position: absolute;
  inset: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: opacity 220ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.pp__ic--pause {
  opacity: 0;
  transform: rotate(120deg) scale(0.3);
}

.pl.is-playing .pp__ic--play {
  opacity: 0;
  transform: rotate(-120deg) scale(0.3);
}

.pl.is-playing .pp__ic--pause {
  opacity: 1;
  transform: none;
}

.pp__ring {
  position: absolute;
  inset: 0;
  border: 2px solid rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  opacity: 0;
  transform: scale(1);
}

.pl__fillwrap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: rgba(255, 255, 255, 0.28);
}

.pl__fill {
  display: block;
  height: 100%;
  background: #2f6df6;
  transform-origin: left center;
  transform: scaleX(0.07);
}

.pl.is-demo .pp__ic--play {
  animation-name: pp-play;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

.pl.is-demo .pp__ic--pause {
  animation-name: pp-pause;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

.pl.is-demo .pp__ring {
  animation-name: pp-ring;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.pl.is-demo .pl__fill {
  animation-name: pp-fill;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes pp-play {
  0%, 38% {
    opacity: 0;
    transform: rotate(-120deg) scale(0.3);
  }
  50%, 78% {
    opacity: 1;
    transform: none;
  }
  90%, 100% {
    opacity: 0;
    transform: rotate(-120deg) scale(0.3);
  }
}
@keyframes pp-pause {
  0%, 38% {
    opacity: 1;
    transform: none;
  }
  50%, 78% {
    opacity: 0;
    transform: rotate(120deg) scale(0.3);
  }
  90%, 100% {
    opacity: 1;
    transform: none;
  }
}
@keyframes pp-ring {
  0%, 36% {
    opacity: 0;
    transform: scale(0.9);
  }
  42% {
    opacity: 0.9;
  }
  56% {
    opacity: 0;
    transform: scale(1.9);
  }
  76% {
    opacity: 0;
    transform: scale(0.9);
  }
  82% {
    opacity: 0.9;
  }
  96%, 100% {
    opacity: 0;
    transform: scale(1.9);
  }
}
@keyframes pp-fill {
  0% {
    transform: scaleX(0.07);
  }
  38% {
    transform: scaleX(0.3);
  }
  50%, 78% {
    transform: scaleX(0.3);
  }
  90%, 100% {
    transform: scaleX(0.07);
  }
}
@media (prefers-reduced-motion: reduce) {
  .pl.is-demo .pp__ic--play, .pl.is-demo .pp__ic--pause, .pl.is-demo .pp__ring,
  .pl.is-demo .pl__fill, .pl__stripes {
    animation: none !important;
  }
  .pp, .pp__ic {
    transition: none;
  }
}

// 실제 동작: 버튼으로 Play/일시정지를 바꾸고 더미 Play 시계를 걷는다.
var root = document.getElementById('pl'),
    btn = document.getElementById('pp'),
    clock = document.getElementById('clock'),
    now = document.getElementById('t-now'),
    fill = document.getElementById('fill');
var DUR = 180, t = 12, playing = true, last = Date.now();
function fmt(s) { s = Math.floor(s); return Math.floor(s / 60) + ':' + ('0' + (s % 60)).slice(-2); }
function paint() {
  clock.textContent = fmt(t);
  now.textContent = fmt(t);
  fill.style.transform = 'scaleX(' + (t / DUR).toFixed(4) + ')';
}
setInterval(function () {
  var n = Date.now();
  if (playing) t = (t + (n - last) / 1000) % DUR;
  last = n;
  paint();
}, 250);
function toggle() {
  root.classList.remove('is-demo');
  playing = !playing;
  root.classList.toggle('is-playing', playing);
  btn.setAttribute('aria-label', playing ? 'Pause' : 'Play');
}
btn.addEventListener('click', toggle);

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

export type PlayPauseMorphProps = {
  /** 더미 영상 길이(초) */
  total?: number;
  /** 시작 위치(초) */
  start?: number;
  duration?: number;
  easing?: string;
  color?: string;
};

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

function fmt(s: number) {
  const n = Math.floor(s);
  return Math.floor(n / 60) + ":" + ("0" + (n % 60)).slice(-2);
}

function PlayIcon() {
  return (
    <svg viewBox="0 0 256 256" width="20" height="20" aria-hidden="true">
      <g fill="currentColor">
        <path d="M228.23 134.69L84.15 222.81A8 8 0 0 1 72 216.12V39.88a8 8 0 0 1 12.15-6.69l144.08 88.12a7.82 7.82 0 0 1 0 13.38" opacity=".2" />
        <path d="M232.4 114.49L88.32 26.35a16 16 0 0 0-16.2-.3A15.86 15.86 0 0 0 64 39.87v176.26A15.94 15.94 0 0 0 80 232a16.07 16.07 0 0 0 8.36-2.35l144.04-88.14a15.81 15.81 0 0 0 0-27ZM80 215.94V40l143.83 88Z" />
      </g>
    </svg>
  );
}

function PauseIcon() {
  return (
    <svg viewBox="0 0 256 256" width="20" height="20" aria-hidden="true">
      <g fill="currentColor">
        <path d="M208 48v160a8 8 0 0 1-8 8h-40a8 8 0 0 1-8-8V48a8 8 0 0 1 8-8h40a8 8 0 0 1 8 8M96 40H56a8 8 0 0 0-8 8v160a8 8 0 0 0 8 8h40a8 8 0 0 0 8-8V48a8 8 0 0 0-8-8" opacity=".2" />
        <path d="M200 32h-40a16 16 0 0 0-16 16v160a16 16 0 0 0 16 16h40a16 16 0 0 0 16-16V48a16 16 0 0 0-16-16m0 176h-40V48h40ZM96 32H56a16 16 0 0 0-16 16v160a16 16 0 0 0 16 16h40a16 16 0 0 0 16-16V48a16 16 0 0 0-16-16m0 176H56V48h40Z" />
      </g>
    </svg>
  );
}

export default function PlayPauseMorph({
  total = 180,
  start = 12,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#2f6df6",
}: PlayPauseMorphProps) {
  const [playing, setPlaying] = useState(true);
  const [t, setT] = useState(start);
  const [pulse, setPulse] = useState(0);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  // 더미 재생 시계 — 바닐라의 setInterval(250ms) 를 그대로
  useEffect(() => {
    if (!playing) return;
    let last = Date.now();
    const id = setInterval(() => {
      const n = Date.now();
      const step = (n - last) / 1000;
      last = n;
      setT((p) => (p + step) % total);
    }, 250);
    return () => clearInterval(id);
  }, [playing, total]);

  function toggle() {
    setPlaying((p) => !p);
    setPulse((p) => p + 1);
  }

  return (
    <figure className={`${styles.player} ${playing ? styles.isPlaying : ""}`} style={vars}>
      <div className={styles.screen}>
        <div className={styles.stripes} aria-hidden="true" />
        <div className={styles.world} aria-hidden="true">
          <span className={styles.sun} />
          <span className={`${styles.hill} ${styles.hillA}`} />
          <span className={`${styles.hill} ${styles.hillB}`} />
        </div>
        <span className={styles.clock}>{fmt(t)}</span>
        <span className={styles.badge}>{fmt(total)}</span>
        <div className={styles.bar}>
          <button
            className={styles.pp}
            type="button"
            aria-label={playing ? "일시정지" : "재생"}
            onClick={toggle}
          >
            {pulse > 0 ? <span key={pulse} className={styles.ring} aria-hidden="true" /> : null}
            <span className={`${styles.ic} ${styles.icPlay}`}>
              <PlayIcon />
            </span>
            <span className={`${styles.ic} ${styles.icPause}`}>
              <PauseIcon />
            </span>
          </button>
          <span className={styles.time}>
            <b>{fmt(t)}</b> / {fmt(total)}
          </span>
        </div>
        <span className={styles.fillwrap} aria-hidden="true">
          <span className={styles.fill} style={{ transform: `scaleX(${(t / total).toFixed(4)})` }} />
        </span>
      </div>
    </figure>
  );
}