02YouTube lite facade — an embed that switches to a full frame once elapsed time crosses a set point

<main class="stage">
<section class="panel">
  <div class="card" id="card" data-state="lite">
    <div class="thumbWrap">
      <canvas class="thumb" id="thumb" width="320" height="180" aria-hidden="true"></canvas>
      <div class="playBtn" role="button" aria-label="Play">
        <svg class="playIcon" viewBox="0 0 24 24" aria-hidden="true"><polygon points="7,4 20,12 7,20"></polygon></svg>
      </div>
      <span class="badgeLite">Lite</span>
      <span class="cardTitleLite">Lightweight thumbnail card</span>
      <div class="frameTop">
        <span class="frameTopTitle">Ready to play</span>
      </div>
      <div class="frameBottom">
        <div class="progressTrack">
          <div class="progressFill" id="progressFill"></div>
        </div>
        <span class="timeLabel" id="timeLabel">0:00 / 0:12</span>
      </div>
    </div>
  </div>
  <div class="readout" id="readout" aria-live="polite">Elapsed 0.00s · switch 1.2s</div>
</section>
</main>

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

@include stage($stage-yellow);

.panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.card {
  position: relative;
}

.thumbWrap {
  position: relative;
  width: 190px;
  aspect-ratio: 16 / 9;
  border-radius: $r-card;
  overflow: hidden;
  box-shadow: $shadow-raised;
}

.thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.playBtn {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transition: opacity $dur-quick $ease-out;
}

.playIcon {
  width: 30px;
  height: 30px;
  filter: drop-shadow(0 2px 4px rgba(23, 20, 26, .4));

  polygon {
    fill: $subject-cream;
  }
}

.badgeLite {
  position: absolute;
  top: $sp-2;
  left: $sp-2;
  padding: $sp-1 $sp-2;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .66);
  color: $subject-cream;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 9px;
  line-height: 1.3;
  transition: opacity $dur-quick $ease-out;
}

.cardTitleLite {
  position: absolute;
  inset: auto 0 0 0;
  padding: $sp-2 $sp-3;
  background: rgba(23, 20, 26, .66);
  color: $subject-cream;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
  transition: opacity $dur-quick $ease-out;
}

.frameTop {
  position: absolute;
  inset: 0 0 auto 0;
  padding: $sp-2 $sp-3;
  background: rgba(23, 20, 26, .66);
  opacity: 0;
  transition: opacity $dur-quick $ease-out;
}

.frameTopTitle {
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
  color: $subject-cream;
  opacity: .96;
}

.frameBottom {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  align-items: center;
  gap: $sp-2;
  padding: $sp-2 $sp-3;
  background: rgba(23, 20, 26, .66);
  opacity: 0;
  transition: opacity $dur-quick $ease-out;
}

.progressTrack {
  flex: 1 1 auto;
  height: 4px;
  border-radius: $r-xs;
  background: rgba($subject-cream, .3);
  overflow: hidden;
}

.progressFill {
  width: 100%;
  height: 100%;
  transform-origin: left center;
  transform: scaleX(0);
  background: $subject-cream;
}

.timeLabel {
  flex: 0 0 auto;
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 9px;
  line-height: 1.3;
  color: $subject-cream;
  opacity: .96;
}

.card[data-state='frame'] .badgeLite,
.card[data-state='frame'] .cardTitleLite,
.card[data-state='frame'] .playBtn {
  opacity: 0;
}

.card[data-state='frame'] .frameTop,
.card[data-state='frame'] .frameBottom {
  opacity: 1;
}

.readout {
  display: inline-flex;
  align-items: center;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: $subject-cream;
  color: $subject-ink;
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 12px;
  line-height: 1.3;
}

@media (max-width: 340px) {
  .thumbWrap { width: 138px; }
  .playIcon { width: 22px; height: 22px; }
  .badgeLite { font-size: 8px; }
  .cardTitleLite { font-size: 10px; }
  .frameTopTitle { font-size: 10px; }
  .timeLabel { font-size: 8px; }
  .readout { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .playBtn,
  .badgeLite,
  .cardTitleLite,
  .frameTop,
  .frameBottom {
    transition: none;
  }
}

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);
}

.panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.card {
  position: relative;
}

.thumbWrap {
  position: relative;
  width: 190px;
  aspect-ratio: 16/9;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.playBtn {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transition: opacity 220ms ease-out;
}

.playIcon {
  width: 30px;
  height: 30px;
  filter: drop-shadow(0 2px 4px rgba(23, 20, 26, 0.4));
}
.playIcon polygon {
  fill: #fff7e6;
}

.badgeLite {
  position: absolute;
  top: 8px;
  left: 8px;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.66);
  color: #fff7e6;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 9px;
  line-height: 1.3;
  transition: opacity 220ms ease-out;
}

.cardTitleLite {
  position: absolute;
  inset: auto 0 0 0;
  padding: 8px 12px;
  background: rgba(23, 20, 26, 0.66);
  color: #fff7e6;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
  transition: opacity 220ms ease-out;
}

.frameTop {
  position: absolute;
  inset: 0 0 auto 0;
  padding: 8px 12px;
  background: rgba(23, 20, 26, 0.66);
  opacity: 0;
  transition: opacity 220ms ease-out;
}

.frameTopTitle {
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
  color: #fff7e6;
  opacity: 0.96;
}

.frameBottom {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(23, 20, 26, 0.66);
  opacity: 0;
  transition: opacity 220ms ease-out;
}

.progressTrack {
  flex: 1 1 auto;
  height: 4px;
  border-radius: 4px;
  background: rgba(255, 247, 230, 0.3);
  overflow: hidden;
}

.progressFill {
  width: 100%;
  height: 100%;
  transform-origin: left center;
  transform: scaleX(0);
  background: #fff7e6;
}

.timeLabel {
  flex: 0 0 auto;
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 9px;
  line-height: 1.3;
  color: #fff7e6;
  opacity: 0.96;
}

.card[data-state=frame] .badgeLite,
.card[data-state=frame] .cardTitleLite,
.card[data-state=frame] .playBtn {
  opacity: 0;
}

.card[data-state=frame] .frameTop,
.card[data-state=frame] .frameBottom {
  opacity: 1;
}

.readout {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  background: #fff7e6;
  color: #17141a;
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 12px;
  line-height: 1.3;
}

@media (max-width: 340px) {
  .thumbWrap {
    width: 138px;
  }
  .playIcon {
    width: 22px;
    height: 22px;
  }
  .badgeLite {
    font-size: 8px;
  }
  .cardTitleLite {
    font-size: 10px;
  }
  .frameTopTitle {
    font-size: 10px;
  }
  .timeLabel {
    font-size: 8px;
  }
  .readout {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .playBtn,
  .badgeLite,
  .cardTitleLite,
  .frameTop,
  .frameBottom {
    transition: none;
  }
}

// 가벼운 파사드 임베드(02) — Elapsed 시간이 임계값(FACADE_DELAY)을 넘는 순간
// data-state 를 'lite' → 'frame' 으로 바꾸는 상태 머신. 실키·실서버 요청 없음.
(function () {
  function mulberry32(seed) {
    var a = seed >>> 0;
    return function () {
      a |= 0; a = (a + 0x6D2B79F5) | 0;
      var t = Math.imul(a ^ (a >>> 15), 1 | a);
      t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
      return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
    };
  }

  function drawSeedThumb(canvas, seed) {
    var ctx = canvas.getContext('2d');
    if (!ctx) return;
    var rnd = mulberry32(seed);
    var w = canvas.width, h = canvas.height;
    var hues = [216, 32, 268, 168];
    ctx.fillStyle = 'hsl(' + hues[Math.floor(rnd() * hues.length)] + ', 38%, 22%)';
    ctx.fillRect(0, 0, w, h);
    for (var i = 0; i < 6; i++) {
      var cx = rnd() * w, cy = rnd() * h, r = (0.18 + rnd() * 0.3) * Math.min(w, h);
      ctx.fillStyle = 'hsla(' + hues[Math.floor(rnd() * hues.length)] + ', ' + (44 + rnd() * 22).toFixed(1) + '%, ' + (38 + rnd() * 26).toFixed(1) + '%, .5)';
      ctx.beginPath(); ctx.arc(cx, cy, r, 0, Math.PI * 2); ctx.fill();
    }
    ctx.fillStyle = 'rgba(255, 247, 230, .06)';
    for (var j = 0; j < h; j += 4) ctx.fillRect(0, j, w, 1);
  }

  var cardEl = document.getElementById('card');
  var thumbEl = document.getElementById('thumb');
  var progressFillEl = document.getElementById('progressFill');
  var timeLabelEl = document.getElementById('timeLabel');
  var readoutEl = document.getElementById('readout');
  if (!cardEl || !thumbEl || !progressFillEl || !timeLabelEl || !readoutEl) return;

  drawSeedThumb(thumbEl, 102);

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var CYCLE_MS = 2000;
  var FACADE_DELAY = 1200;
  var TOTAL_SEC = 12;
  var transitionSec = (FACADE_DELAY / 1000).toFixed(1);

  function apply(t) {
    var isFrame = t >= FACADE_DELAY;
    cardEl.dataset.state = isFrame ? 'frame' : 'lite';
    var progress = isFrame ? (t - FACADE_DELAY) / (CYCLE_MS - FACADE_DELAY) : 0;
    progressFillEl.style.transform = 'scaleX(' + progress.toFixed(4) + ')';
    var sec = Math.floor(progress * TOTAL_SEC);
    timeLabelEl.textContent = '0:' + String(sec).padStart(2, '0') + ' / 0:12';
    readoutEl.textContent = 'Elapsed ' + (t / 1000).toFixed(2) + 's · switch ' + transitionSec + 's';
  }

  apply(0);
  if (reduce) return;

  var start = null;
  function loop(ts) {
    if (start === null) start = ts;
    var t = (ts - start) % CYCLE_MS;
    apply(t);
    requestAnimationFrame(loop);
  }
  requestAnimationFrame(loop);
})();

import { useEffect, useRef } from "react";
import styles from "./EmbedYoutubeLiteFacade.module.scss";

// 가벼운 파사드 임베드 — 경과 시간이 임계값(FACADE_DELAY)을 넘는 순간
// data-state 를 'lite' → 'frame' 으로 바꾸는 상태 머신. 실키·실서버 요청 없음.
const CYCLE_MS = 2000;
const FACADE_DELAY = 1200;
const TOTAL_SEC = 12;

function mulberry32(seed: number) {
  let a = seed >>> 0;
  return function () {
    a |= 0; a = (a + 0x6D2B79F5) | 0;
    let t = Math.imul(a ^ (a >>> 15), 1 | a);
    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };
}

function drawSeedThumb(canvas: HTMLCanvasElement, seed: number) {
  const ctx = canvas.getContext("2d");
  if (!ctx) return;
  const rnd = mulberry32(seed);
  const w = canvas.width, h = canvas.height;
  const hues = [216, 32, 268, 168];
  ctx.fillStyle = "hsl(" + hues[Math.floor(rnd() * hues.length)] + ", 38%, 22%)";
  ctx.fillRect(0, 0, w, h);
  for (let i = 0; i < 6; i++) {
    const cx = rnd() * w, cy = rnd() * h, r = (0.18 + rnd() * 0.3) * Math.min(w, h);
    ctx.fillStyle = "hsla(" + hues[Math.floor(rnd() * hues.length)] + ", " + (44 + rnd() * 22).toFixed(1) + "%, " + (38 + rnd() * 26).toFixed(1) + "%, .5)";
    ctx.beginPath(); ctx.arc(cx, cy, r, 0, Math.PI * 2); ctx.fill();
  }
  ctx.fillStyle = "rgba(255, 247, 230, .06)";
  for (let j = 0; j < h; j += 4) ctx.fillRect(0, j, w, 1);
}

export default function EmbedYoutubeLiteFacade() {
  const cardRef = useRef<HTMLDivElement>(null);
  const thumbRef = useRef<HTMLCanvasElement>(null);
  const progressFillRef = useRef<HTMLDivElement>(null);
  const timeLabelRef = useRef<HTMLSpanElement>(null);
  const readoutRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const card = cardRef.current;
    const thumb = thumbRef.current;
    const progressFill = progressFillRef.current;
    const timeLabel = timeLabelRef.current;
    const readout = readoutRef.current;
    if (!card || !thumb || !progressFill || !timeLabel || !readout) return;

    drawSeedThumb(thumb, 102);

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    const transitionSec = (FACADE_DELAY / 1000).toFixed(1);

    function apply(t: number) {
      const isFrame = t >= FACADE_DELAY;
      card!.dataset.state = isFrame ? "frame" : "lite";
      const progress = isFrame ? (t - FACADE_DELAY) / (CYCLE_MS - FACADE_DELAY) : 0;
      progressFill!.style.transform = "scaleX(" + progress.toFixed(4) + ")";
      const sec = Math.floor(progress * TOTAL_SEC);
      timeLabel!.textContent = "0:" + String(sec).padStart(2, "0") + " / 0:12";
      readout!.textContent = "경과 " + (t / 1000).toFixed(2) + "초 · 전환 " + transitionSec + "초";
    }

    apply(0);
    if (reduce) return;

    let start: number | null = null;
    let raf = 0;
    function loop(ts: number) {
      if (start === null) start = ts;
      const t = (ts - start) % CYCLE_MS;
      apply(t);
      raf = requestAnimationFrame(loop);
    }
    raf = requestAnimationFrame(loop);
    return () => cancelAnimationFrame(raf);
  }, []);

  return (
    <div className={styles.stage}>
      <section className={styles.panel}>
        <div className={styles.card} ref={cardRef} data-state="lite">
          <div className={styles.thumbWrap}>
            <canvas className={styles.thumb} ref={thumbRef} width={320} height={180} aria-hidden="true" />
            <div className={styles.playBtn} role="button" aria-label="재생">
              <svg className={styles.playIcon} viewBox="0 0 24 24" aria-hidden="true">
                <polygon points="7,4 20,12 7,20" />
              </svg>
            </div>
            <span className={styles.badgeLite}>라이트</span>
            <span className={styles.cardTitleLite}>가벼운 썸네일 카드</span>
            <div className={styles.frameTop}>
              <span className={styles.frameTopTitle}>재생 준비 완료</span>
            </div>
            <div className={styles.frameBottom}>
              <div className={styles.progressTrack}>
                <div className={styles.progressFill} ref={progressFillRef} />
              </div>
              <span className={styles.timeLabel} ref={timeLabelRef}>0:00 / 0:12</span>
            </div>
          </div>
        </div>
        <div className={styles.readout} ref={readoutRef} aria-live="polite">경과 0.00초 · 전환 1.2초</div>
      </section>
    </div>
  );
}