04縦型ショート動画埋め込み — 余った幅の分だけ背景のぼかしを求め直すフレーム

<main class="stage">
<canvas class="bg" id="bg" width="480" height="300" aria-hidden="true"></canvas>
<section class="panel">
  <div class="frameWrap">
    <div class="frame" id="frame">
      <canvas class="thumb" id="thumb" width="120" height="213"></canvas>
      <div class="playBtn" role="button" aria-label="再生">
        <span class="playShape" aria-hidden="true"></span>
      </div>
      <div class="captionBar">
        <span class="captionText">縦型動画 9:16</span>
      </div>
    </div>
  </div>
  <div class="readout" id="readout">余白 148px · ぼかし 17px</div>
</section>
</main>

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

// 세로형 임베드 프레임 — 프레임 폭 애니메이션은 JS 계산 겹(leftover → blur)의 재료라 rule1 예외.
// CSS keyframes 는 두지 않는다 — 전부 rAF 실시간 루프.

@include stage($stage-paper);

.stage {
  position: relative;
  overflow: hidden;
}

.bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  will-change: filter;
}

.panel {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
}

.frameWrap {
  display: grid;
  place-items: center;
  --base-fw: 118;
  --amp-fw: 16;
}

.frame {
  position: relative;
  aspect-ratio: 9 / 16;
  border-radius: $r-card;
  overflow: hidden;
  background: $stage-ink;
  box-shadow: $shadow-raised;
}

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

.playBtn {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

.playShape {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 11px 0 11px 17px;
  border-color: transparent transparent transparent $subject-cream;
  filter: drop-shadow(0 1px 2px rgba(23, 20, 26, .4));
  opacity: .92;
}

.captionBar {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: $sp-2 $sp-1;
  background: rgba(23, 20, 26, .66);
  backdrop-filter: blur(4px);
}

.captionText {
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.3;
  color: $subject-cream;
  opacity: .9;
}

.readout {
  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) {
  .frameWrap { --base-fw: 62; --amp-fw: 10; }
  .panel { gap: $sp-1; }
  .captionText { font-size: 10px; }
  .readout { font-size: 10px; padding: $sp-1 $sp-2; }
}

@media (prefers-reduced-motion: reduce) {
  .bg { filter: blur(8px); }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  position: relative;
  overflow: hidden;
}

.bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  will-change: filter;
}

.panel {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.frameWrap {
  display: grid;
  place-items: center;
  --base-fw: 118;
  --amp-fw: 16;
}

.frame {
  position: relative;
  aspect-ratio: 9/16;
  border-radius: 16px;
  overflow: hidden;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

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

.playBtn {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

.playShape {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 11px 0 11px 17px;
  border-color: transparent transparent transparent #fff7e6;
  filter: drop-shadow(0 1px 2px rgba(23, 20, 26, 0.4));
  opacity: 0.92;
}

.captionBar {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 4px;
  background: rgba(23, 20, 26, 0.66);
  backdrop-filter: blur(4px);
}

.captionText {
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.3;
  color: #fff7e6;
  opacity: 0.9;
}

.readout {
  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) {
  .frameWrap {
    --base-fw: 62;
    --amp-fw: 10;
  }
  .panel {
    gap: 4px;
  }
  .captionText {
    font-size: 10px;
  }
  .readout {
    font-size: 10px;
    padding: 4px 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .bg {
    filter: blur(8px);
  }
}

// 세로형 임베드 프레임(04) — 프레임 폭이 숨쉬듯 늘고 줄면, 남는 스테이지 폭만큼
// 뒤 배경이 흐려진다(초점이 앞으로 온 느낌). 실키·실서버 요청 없음 — 자동 再生 시나리오.
(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 stageEl = document.querySelector('.stage');
  var bgEl = document.getElementById('bg');
  var thumbEl = document.getElementById('thumb');
  var frameEl = document.getElementById('frame');
  var readoutEl = document.getElementById('readout');
  if (!stageEl || !bgEl || !thumbEl || !frameEl || !readoutEl) return;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  drawSeedThumb(bgEl, 104);
  drawSeedThumb(thumbEl, 140);

  var CYCLE_MS = 2000;
  var BG_BLUR_PX = 8;
  // 폭 밑값·진폭은 scss 커스텀 프로퍼티에서 프레임마다 다시 읽는다 — 320px 미디어쿼리가 값을 낮추는데
  // 시작 폭에서 한 번만 캡처하면 뷰포트가 줄어도 큰 값이 남아 BD9 가 깨진다(04 실측 2026-09-19: 134×238px → 289px).
  var frameWrapEl = frameEl.parentElement;

  function apply(t) {
    var frameWrapStyle = getComputedStyle(frameWrapEl);
    var BASE_FW = parseFloat(frameWrapStyle.getPropertyValue('--base-fw')) || 118;
    var AMP_FW = parseFloat(frameWrapStyle.getPropertyValue('--amp-fw')) || 16;
    var fw = BASE_FW + AMP_FW * Math.sin(2 * Math.PI * t / CYCLE_MS);
    frameEl.style.width = fw.toFixed(1) + 'px';
    // 계산 겹: 남는 스테이지 폭 → 배경 흐림 강도. 프레임이 커질수록 뒤 배경은 덜 흐리다.
    var leftover = stageEl.clientWidth - frameEl.getBoundingClientRect().width;
    var blur = BG_BLUR_PX + leftover / 14;
    bgEl.style.filter = 'blur(' + blur.toFixed(1) + 'px)';
    readoutEl.textContent = '余白 ' + Math.round(leftover) + 'px · ぼかし ' + blur.toFixed(1) + 'px';
  }

  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 "./EmbedShortsVertical.module.scss";

// 세로형 임베드 프레임 — 프레임 폭이 숨쉬듯 늘고 줄면, 남는 스테이지 폭만큼
// 뒤 배경이 흐려진다(초점이 앞으로 온 느낌). 실키·실서버 요청 없음.
const CYCLE_MS = 2000;
const BG_BLUR_PX = 8;

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 EmbedShortsVertical() {
  const stageRef = useRef<HTMLDivElement>(null);
  const bgRef = useRef<HTMLCanvasElement>(null);
  const thumbRef = useRef<HTMLCanvasElement>(null);
  const frameWrapRef = useRef<HTMLDivElement>(null);
  const frameRef = useRef<HTMLDivElement>(null);
  const readoutRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const stageEl = stageRef.current;
    const bgEl = bgRef.current;
    const thumbEl = thumbRef.current;
    const frameWrapEl = frameWrapRef.current;
    const frameEl = frameRef.current;
    const readoutEl = readoutRef.current;
    if (!stageEl || !bgEl || !thumbEl || !frameWrapEl || !frameEl || !readoutEl) return;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    drawSeedThumb(bgEl, 104);
    drawSeedThumb(thumbEl, 140);

    function apply(t: number) {
      // 폭 밑값·진폭은 매 프레임 다시 읽는다 — 320px 미디어쿼리가 낮춘 값을 시작 폭 캡처로 놓치면 BD9 가 깨진다.
      const frameWrapStyle = getComputedStyle(frameWrapEl!);
      const baseFw = parseFloat(frameWrapStyle.getPropertyValue("--base-fw")) || 118;
      const ampFw = parseFloat(frameWrapStyle.getPropertyValue("--amp-fw")) || 16;
      const fw = baseFw + ampFw * Math.sin((2 * Math.PI * t) / CYCLE_MS);
      frameEl!.style.width = fw.toFixed(1) + "px";
      // 계산 겹: 남는 스테이지 폭 → 배경 흐림 강도.
      const leftover = stageEl!.clientWidth - frameEl!.getBoundingClientRect().width;
      const blur = BG_BLUR_PX + leftover / 14;
      bgEl!.style.filter = "blur(" + blur.toFixed(1) + "px)";
      readoutEl!.textContent = "여백 " + Math.round(leftover) + "px · 흐림 " + blur.toFixed(1) + "px";
    }

    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} ref={stageRef}>
      <canvas className={styles.bg} ref={bgRef} width={480} height={300} aria-hidden="true" />
      <section className={styles.panel}>
        <div className={styles.frameWrap} ref={frameWrapRef}>
          <div className={styles.frame} ref={frameRef}>
            <canvas className={styles.thumb} ref={thumbRef} width={120} height={213} />
            <div className={styles.playBtn} role="button" aria-label="재생">
              <span className={styles.playShape} aria-hidden="true" />
            </div>
            <div className={styles.captionBar}>
              <span className={styles.captionText}>세로 영상 9:16</span>
            </div>
          </div>
        </div>
        <div className={styles.readout} ref={readoutRef}>
          여백 148px · 흐림 17px
        </div>
      </section>
    </div>
  );
}