05TikTok embed mock — a card that recomputes its like count from elapsed time

<main class="stage">
<div class="card">
  <div class="left">
    <div class="thumbWrap" id="thumbWrap">
      <canvas class="thumb" id="thumb" width="132" height="176"></canvas>
      <div class="flash" id="flash" aria-hidden="true"></div>
      <div class="burst" id="burst" aria-hidden="true">
        <svg class="burstIcon" viewBox="0 0 256 256"><g fill="currentColor">
          <path d="M232 102c0 66-104 122-104 122S24 168 24 102a54 54 0 0 1 54-54c22.59 0 41.94 12.31 50 32c8.06-19.69 27.41-32 50-32a54 54 0 0 1 54 54" opacity=".2"/>
          <path d="M178 40c-20.65 0-38.73 8.88-50 23.89C116.73 48.88 98.65 40 78 40a62.07 62.07 0 0 0-62 62c0 70 103.79 126.66 108.21 129a8 8 0 0 0 7.58 0C136.21 228.66 240 172 240 102a62.07 62.07 0 0 0-62-62m-50 174.8c-18.26-10.64-96-59.11-96-112.8a46.06 46.06 0 0 1 46-46c19.45 0 35.78 10.36 42.6 27a8 8 0 0 0 14.8 0c6.82-16.67 23.15-27 42.6-27a46.06 46.06 0 0 1 46 46c0 53.61-77.76 102.15-96 112.8"/>
        </g></svg>
      </div>
    </div>
    <p class="caption">@channelA · original sound</p>
  </div>
  <div class="rail">
    <div class="heartWrap" id="heartWrap">
      <svg class="heartIcon" viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor">
        <path d="M232 102c0 66-104 122-104 122S24 168 24 102a54 54 0 0 1 54-54c22.59 0 41.94 12.31 50 32c8.06-19.69 27.41-32 50-32a54 54 0 0 1 54 54" opacity=".2"/>
        <path d="M178 40c-20.65 0-38.73 8.88-50 23.89C116.73 48.88 98.65 40 78 40a62.07 62.07 0 0 0-62 62c0 70 103.79 126.66 108.21 129a8 8 0 0 0 7.58 0C136.21 228.66 240 172 240 102a62.07 62.07 0 0 0-62-62m-50 174.8c-18.26-10.64-96-59.11-96-112.8a46.06 46.06 0 0 1 46-46c19.45 0 35.78 10.36 42.6 27a8 8 0 0 0 14.8 0c6.82-16.67 23.15-27 42.6-27a46.06 46.06 0 0 1 46 46c0 53.61-77.76 102.15-96 112.8"/>
      </g></svg>
    </div>
    <span class="likeCount" id="likeCount">1,247</span>
    <span class="railLabel">Likes</span>
  </div>
</div>
<div class="readout" id="readout">Interval 0.4s · likes 1,247</div>
</main>

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

// 세로형 카드 임베드 — 좋아요 계단 카운터(계산 겹)와 하트 팝은 JS 계산 겹의 재료.
// CSS keyframes 는 두지 않는다 — 전부 rAF 실시간 루프.

@include stage($stage-ink);

.stage {
  overflow: hidden;
}

.card {
  display: flex;
  align-items: stretch;
  gap: $sp-3;
  padding: $sp-3;
  border-radius: $r-card;
  background: $subject-cream;
  box-shadow: $shadow-raised;
  --thumb-w: 120px;
}

.left {
  display: flex;
  flex-direction: column;
  gap: $sp-2;
  min-width: 0;
  width: var(--thumb-w, 120px);
  flex-shrink: 0;
}

.thumbWrap {
  position: relative;
  width: var(--thumb-w, 120px);
  aspect-ratio: 3 / 4;
  border-radius: $r-sm;
  overflow: hidden;
}

.thumb {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flash {
  position: absolute;
  inset: 0;
  background: $subject-cream;
  opacity: 0;
  pointer-events: none;
}

.burst {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 46px;
  height: 46px;
  color: $subject-cream;
  opacity: 0;
  pointer-events: none;
}

.burstIcon {
  width: 100%;
  height: 100%;
  display: block;
  filter: drop-shadow(0 2px 6px rgba(23, 20, 26, .5));
}

.caption {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.4;
  color: $subject-ink;
  overflow: hidden;
  text-overflow: clip;
  white-space: nowrap;
}

.rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: $sp-1;
  width: 40px;
  flex-shrink: 0;
}

.heartWrap {
  width: 24px;
  height: 24px;
  display: block;
}

.heartIcon {
  width: 100%;
  height: 100%;
  display: block;
}

.heartIcon path {
  fill: $subject-pink;
}

.likeCount {
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.2;
  color: $subject-ink;
}

.railLabel {
  writing-mode: vertical-rl;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 9px;
  line-height: 1;
  color: $subject-ink;
  opacity: .72;
}

.readout {
  position: relative;
  margin-top: $sp-3;
  display: inline-flex;
  align-items: center;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: $subject-blue-deep;
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.3;
  color: $subject-cream;
}

@media (max-width: 340px) {
  .card {
    padding: $sp-2;
    gap: $sp-2;
    --thumb-w: 56px;
  }
  .rail {
    width: 30px;
  }
  .heartWrap {
    width: 20px;
    height: 20px;
  }
  .caption {
    font-size: 10px;
  }
  .likeCount {
    font-size: 10px;
  }
  .railLabel {
    font-size: 8px;
  }
  .readout {
    font-size: 10px;
    padding: $sp-1 $sp-2;
    margin-top: $sp-2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .burst,
  .flash {
    opacity: 0;
  }
}

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);
}

.stage {
  overflow: hidden;
}

.card {
  display: flex;
  align-items: stretch;
  gap: 12px;
  padding: 12px;
  border-radius: 16px;
  background: #fff7e6;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  --thumb-w: 120px;
}

.left {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  width: var(--thumb-w, 120px);
  flex-shrink: 0;
}

.thumbWrap {
  position: relative;
  width: var(--thumb-w, 120px);
  aspect-ratio: 3/4;
  border-radius: 8px;
  overflow: hidden;
}

.thumb {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flash {
  position: absolute;
  inset: 0;
  background: #fff7e6;
  opacity: 0;
  pointer-events: none;
}

.burst {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 46px;
  height: 46px;
  color: #fff7e6;
  opacity: 0;
  pointer-events: none;
}

.burstIcon {
  width: 100%;
  height: 100%;
  display: block;
  filter: drop-shadow(0 2px 6px rgba(23, 20, 26, 0.5));
}

.caption {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.4;
  color: #17141a;
  overflow: hidden;
  text-overflow: clip;
  white-space: nowrap;
}

.rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 40px;
  flex-shrink: 0;
}

.heartWrap {
  width: 24px;
  height: 24px;
  display: block;
}

.heartIcon {
  width: 100%;
  height: 100%;
  display: block;
}

.heartIcon path {
  fill: #ff9ebb;
}

.likeCount {
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.2;
  color: #17141a;
}

.railLabel {
  writing-mode: vertical-rl;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 600;
  font-size: 9px;
  line-height: 1;
  color: #17141a;
  opacity: 0.72;
}

.readout {
  position: relative;
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  background: #0a4fe8;
  font-family: "Space Mono", ui-monospace, monospace;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.3;
  color: #fff7e6;
}

@media (max-width: 340px) {
  .card {
    padding: 8px;
    gap: 8px;
    --thumb-w: 56px;
  }
  .rail {
    width: 30px;
  }
  .heartWrap {
    width: 20px;
    height: 20px;
  }
  .caption {
    font-size: 10px;
  }
  .likeCount {
    font-size: 10px;
  }
  .railLabel {
    font-size: 8px;
  }
  .readout {
    font-size: 10px;
    padding: 4px 8px;
    margin-top: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .burst,
  .flash {
    opacity: 0;
  }
}

// 세로형 카드 임베드(05) — 좋아요는 상수 간격마다 계단으로 오르고, 오른 순간 하트가 튕긴다.
// 엄지가 두 번 두드릴 때 나오는 큰 하트도 같은 간격으로 썸네일 위에서 커지며 사라진다.
// 실키·실서버 요청 없음 — 좌표·수치는 고정 시나리오로 자동 재생한다.
(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 thumbEl = document.getElementById('thumb');
  var flashEl = document.getElementById('flash');
  var burstEl = document.getElementById('burst');
  var heartWrapEl = document.getElementById('heartWrap');
  var likeCountEl = document.getElementById('likeCount');
  var readoutEl = document.getElementById('readout');
  if (!thumbEl || !flashEl || !burstEl || !heartWrapEl || !likeCountEl || !readoutEl) return;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  drawSeedThumb(thumbEl, 105);

  var CYCLE_MS = 2000;
  var LIKE_INTERVAL = 400;
  var LIKE_STEP = 3;
  var LIKE_BASE = 1247;

  function apply(t) {
    // 계산 겹: 간격마다 Likes 수를 다시 계산 — 트윈이 아니라 계단식 카운터
    var likes = LIKE_BASE + Math.floor(t / LIKE_INTERVAL) * LIKE_STEP;
    var since = t % LIKE_INTERVAL;
    var pop = since < 180 ? 1 + 0.28 * (1 - since / 180) : 1;
    heartWrapEl.style.transform = 'scale(' + pop.toFixed(3) + ')';
    likeCountEl.textContent = likes.toLocaleString('en-US');
    readoutEl.textContent = 'Interval ' + (LIKE_INTERVAL / 1000).toFixed(1) + 's · likes ' + likes.toLocaleString('en-US');

    // 두 번 두드림 하트 — 같은 간격에서 0→1로 커지며 옅어진다(썸네일 위 큰 겹)
    var prog = since / LIKE_INTERVAL;
    var burstScale = 0.3 + prog * 2.3;
    var burstOpacity = Math.max(0, 0.85 * (1 - prog * 1.15));
    burstEl.style.transform = 'translate(-50%, -50%) scale(' + burstScale.toFixed(3) + ')';
    burstEl.style.opacity = burstOpacity.toFixed(3);

    // 좋아요가 오르는 순간 썸네일 전체가 짧게 밝아진다(플래시) — 하트 겹과 같은 since 를 공유
    var flashOpacity = since < 160 ? 0.4 * (1 - since / 160) : 0;
    flashEl.style.opacity = flashOpacity.toFixed(3);
  }

  if (reduce) {
    apply(0);
    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 "./EmbedTiktok.module.scss";

// 세로형 카드 임베드 — 좋아요는 상수 간격마다 계단으로 오르고, 오른 순간 하트가 튕긴다.
// 두 번 두드림 하트도 같은 간격으로 썸네일 위에서 커지며 사라진다. 실키·실서버 요청 없음.
const CYCLE_MS = 2000;
const LIKE_INTERVAL = 400;
const LIKE_STEP = 3;
const LIKE_BASE = 1247;

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;
  const 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;
    const cy = rnd() * h;
    const 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 EmbedTiktok() {
  const thumbRef = useRef<HTMLCanvasElement>(null);
  const flashRef = useRef<HTMLDivElement>(null);
  const burstRef = useRef<HTMLDivElement>(null);
  const heartWrapRef = useRef<HTMLDivElement>(null);
  const likeCountRef = useRef<HTMLSpanElement>(null);
  const readoutRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const thumbEl = thumbRef.current;
    const flashEl = flashRef.current;
    const burstEl = burstRef.current;
    const heartWrapEl = heartWrapRef.current;
    const likeCountEl = likeCountRef.current;
    const readoutEl = readoutRef.current;
    if (!thumbEl || !flashEl || !burstEl || !heartWrapEl || !likeCountEl || !readoutEl) return;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    drawSeedThumb(thumbEl, 105);

    function apply(t: number) {
      // 계산 겹: 간격마다 좋아요 수를 다시 계산 — 트윈이 아니라 계단식 카운터
      const likes = LIKE_BASE + Math.floor(t / LIKE_INTERVAL) * LIKE_STEP;
      const since = t % LIKE_INTERVAL;
      const pop = since < 180 ? 1 + 0.28 * (1 - since / 180) : 1;
      heartWrapEl!.style.transform = "scale(" + pop.toFixed(3) + ")";
      likeCountEl!.textContent = likes.toLocaleString("en-US");
      readoutEl!.textContent = "간격 " + (LIKE_INTERVAL / 1000).toFixed(1) + "초 · 좋아요 " + likes.toLocaleString("en-US");

      // 두 번 두드림 하트 — 같은 간격에서 0→1로 커지며 옅어진다(썸네일 위 큰 겹)
      const prog = since / LIKE_INTERVAL;
      const burstScale = 0.3 + prog * 2.3;
      const burstOpacity = Math.max(0, 0.85 * (1 - prog * 1.15));
      burstEl!.style.transform = "translate(-50%, -50%) scale(" + burstScale.toFixed(3) + ")";
      burstEl!.style.opacity = burstOpacity.toFixed(3);

      // 좋아요가 오르는 순간 썸네일 전체가 짧게 밝아진다(플래시) — 하트 겹과 같은 since 를 공유
      const flashOpacity = since < 160 ? 0.4 * (1 - since / 160) : 0;
      flashEl!.style.opacity = flashOpacity.toFixed(3);
    }

    if (reduce) {
      apply(0);
      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}>
      <div className={styles.card}>
        <div className={styles.left}>
          <div className={styles.thumbWrap}>
            <canvas className={styles.thumb} ref={thumbRef} width={132} height={176} />
            <div className={styles.flash} ref={flashRef} aria-hidden="true" />
            <div className={styles.burst} ref={burstRef} aria-hidden="true">
              <svg className={styles.burstIcon} viewBox="0 0 256 256">
                <g fill="currentColor">
                  <path
                    d="M232 102c0 66-104 122-104 122S24 168 24 102a54 54 0 0 1 54-54c22.59 0 41.94 12.31 50 32c8.06-19.69 27.41-32 50-32a54 54 0 0 1 54 54"
                    opacity=".2"
                  />
                  <path d="M178 40c-20.65 0-38.73 8.88-50 23.89C116.73 48.88 98.65 40 78 40a62.07 62.07 0 0 0-62 62c0 70 103.79 126.66 108.21 129a8 8 0 0 0 7.58 0C136.21 228.66 240 172 240 102a62.07 62.07 0 0 0-62-62m-50 174.8c-18.26-10.64-96-59.11-96-112.8a46.06 46.06 0 0 1 46-46c19.45 0 35.78 10.36 42.6 27a8 8 0 0 0 14.8 0c6.82-16.67 23.15-27 42.6-27a46.06 46.06 0 0 1 46 46c0 53.61-77.76 102.15-96 112.8" />
                </g>
              </svg>
            </div>
          </div>
          <p className={styles.caption}>@channelA · 오리지널 사운드</p>
        </div>
        <div className={styles.rail}>
          <div className={styles.heartWrap} ref={heartWrapRef}>
            <svg className={styles.heartIcon} viewBox="0 0 256 256" aria-hidden="true">
              <g fill="currentColor">
                <path
                  d="M232 102c0 66-104 122-104 122S24 168 24 102a54 54 0 0 1 54-54c22.59 0 41.94 12.31 50 32c8.06-19.69 27.41-32 50-32a54 54 0 0 1 54 54"
                  opacity=".2"
                />
                <path d="M178 40c-20.65 0-38.73 8.88-50 23.89C116.73 48.88 98.65 40 78 40a62.07 62.07 0 0 0-62 62c0 70 103.79 126.66 108.21 129a8 8 0 0 0 7.58 0C136.21 228.66 240 172 240 102a62.07 62.07 0 0 0-62-62m-50 174.8c-18.26-10.64-96-59.11-96-112.8a46.06 46.06 0 0 1 46-46c19.45 0 35.78 10.36 42.6 27a8 8 0 0 0 14.8 0c6.82-16.67 23.15-27 42.6-27a46.06 46.06 0 0 1 46 46c0 53.61-77.76 102.15-96 112.8" />
              </g>
            </svg>
          </div>
          <span className={styles.likeCount} ref={likeCountRef}>
            1,247
          </span>
          <span className={styles.railLabel}>좋아요</span>
        </div>
      </div>
      <div className={styles.readout} ref={readoutRef}>
        간격 0.4초 · 좋아요 1,247
      </div>
    </div>
  );
}