02動画ドロップ — メタデータを読んで長さ・解像度を先に計算するパネル

<main class="stage">
<div class="vd" id="vd">
  <p class="vd__hint" id="vdHint">video/ のみ通過 — メタデータを先に読み込み、再生時間・解像度・ビットレートを計算します</p>
  <div class="vd__zone" id="vdZone" role="button" tabindex="0" aria-describedby="vdHint" aria-label="動画ドロップゾーン">
    <input type="file" id="vdInput" accept="video/*" class="vd__file" aria-label="ファイルを選択">
    <svg class="vd__ic" viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M200 72v112a8 8 0 0 1-8 8H32a8 8 0 0 1-8-8V72a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2"/><path d="M251.77 73a8 8 0 0 0-8.21.39L208 97.05V72a16 16 0 0 0-16-16H32a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16v-25l35.56 23.71A8 8 0 0 0 248 184a8 8 0 0 0 8-8V80a8 8 0 0 0-4.23-7M192 184H32V72h160zm48-22.95l-32-21.33v-23.44L240 95Z"/></g></svg>
  </div>
  <div class="vd__panel" id="vdPanel" aria-live="polite">
    <div class="vd__head">
      <b class="vd__name" id="vdName">lecture-week3.mp4</b>
      <span class="vd__chip" id="vdChip">video/mp4</span>
    </div>
    <dl class="vd__stats">
      <div class="vd__stat"><dt>長さ</dt><dd id="vdDur">128.4秒</dd></div>
      <div class="vd__stat"><dt>解像度</dt><dd id="vdRes">1920×1080</dd></div>
      <div class="vd__stat"><dt>ビットレート</dt><dd id="vdBr">2.8 Mbps</dd></div>
      <div class="vd__stat"><dt>サイズ</dt><dd id="vdSize">44.9 MB</dd></div>
    </dl>
    <div class="vd__scan" aria-hidden="true"><span class="vd__scanbar" id="vdScanbar"></span></div>
    <p class="vd__calc" id="vdCalc">44.9 MB × 8 ÷ 128.4秒 = 2.8 Mbps</p>
  </div>
</div>
</main>

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

$duration: 600ms;      // 메타데이터 스캔 하이라이트(SCAN_MS 와 일치)
$easing: $ease-out;
$color: $subject-ink;  // 노랑 무대 — 글자는 잉크

// 파스텔 강조(채도 .34 · 명도 +.11)
$p-lilac: #b9a0ff;
$p-creamline: #f6eede;

@include stage($stage-yellow);

.vd {
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}

.vd__hint {
  margin: 0;
  padding: 0 $sp-1;
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
  color: $subject-ink;
}

.vd__zone {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 68px;
  padding: $sp-3;
  border: 2px dashed rgba($subject-ink, .72);
  border-radius: $r-card;
  cursor: pointer;
  overflow: hidden;
  transition: border-color $dur-quick $ease-out, background $dur-quick $ease-out;
}

.vd__zone.is-over {
  border-color: $p-lilac;
  background: rgba(185, 160, 255, .18);
}

.vd__file {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.vd__ic {
  width: 32px;
  height: 32px;
  color: $subject-ink;
  transition: transform $dur-quick $ease-pop;
}

.vd__zone.is-over .vd__ic {
  transform: scale(1.15);
}

.vd__panel {
  display: none;
  padding: $sp-3;
  border-radius: $r-card;
  background: $subject-cream;
  box-shadow: $shadow-press;
}

.vd__panel.is-in {
  display: block;
  animation: vdRise $duration $ease-spring both;
}

.vd__head {
  display: flex;
  align-items: center;
  gap: $sp-2;
  margin-bottom: $sp-2;
}

.vd__name {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 700;
  font-size: 12px;
  color: $subject-ink;
}

.vd__chip {
  flex: 0 0 auto;
  padding: $sp-1 $sp-2;
  border-radius: $r-pill;
  background: $color;
  color: $subject-cream;
  font-weight: 700;
  font-size: 10px;
  line-height: 1.2;
}

.vd__stats {
  margin: 0 0 $sp-2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: $sp-1;
}

.vd__stat dt {
  font-weight: 400;
  font-size: 9px;
  color: rgba($subject-ink, .72);
}

.vd__stat dd {
  margin: 0;
  font-weight: 700;
  font-size: 11px;
  color: $subject-ink;
  white-space: nowrap;
}

.vd__scan {
  height: 4px;
  border-radius: $r-pill;
  background: rgba($subject-ink, .12);
  overflow: hidden;
}

.vd__scanbar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: $r-pill;
  background: $p-lilac;
}

.vd__scanbar.is-run {
  animation: vdScan $duration $easing both;
}

.vd__calc {
  margin: $sp-2 0 0;
  font-weight: 400;
  font-size: 10px;
  color: rgba($subject-ink, .72);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@keyframes vdRise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes vdScan {
  from { width: 0; }
  to { width: 100%; }
}

@media (max-width: 340px) {
  .vd { max-width: 280px; gap: $sp-1; }
  .vd__hint { font-size: 9px; line-height: 1.25; }
  .vd__zone { min-height: 32px; padding: $sp-1; }
  .vd__ic { width: 20px; height: 20px; }
  .vd__panel { padding: $sp-1; }
  .vd__head { margin-bottom: $sp-1; }
  .vd__stats { margin-bottom: $sp-1; }
  .vd__stat { min-width: 0; }
  .vd__stat dd { overflow: hidden; text-overflow: ellipsis; }
  .vd__calc { margin-top: $sp-1; }
}

@media (prefers-reduced-motion: reduce) {
  .vd__panel.is-in { animation: none; }
  .vd__scanbar.is-run { animation: none; width: 100%; }
  .vd__zone, .vd__ic { transition: none; }
  .vd__zone.is-over .vd__ic { transform: 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);
}

.vd {
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.vd__hint {
  margin: 0;
  padding: 0 4px;
  font-weight: 500;
  font-size: 11px;
  line-height: 1.4;
  color: #17141a;
}

.vd__zone {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 68px;
  padding: 12px;
  border: 2px dashed rgba(23, 20, 26, 0.72);
  border-radius: 16px;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 220ms ease-out, background 220ms ease-out;
}

.vd__zone.is-over {
  border-color: #b9a0ff;
  background: rgba(185, 160, 255, 0.18);
}

.vd__file {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.vd__ic {
  width: 32px;
  height: 32px;
  color: #17141a;
  transition: transform 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.vd__zone.is-over .vd__ic {
  transform: scale(1.15);
}

.vd__panel {
  display: none;
  padding: 12px;
  border-radius: 16px;
  background: #fff7e6;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.vd__panel.is-in {
  display: block;
  animation: vdRise 600ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.vd__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.vd__name {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 700;
  font-size: 12px;
  color: #17141a;
}

.vd__chip {
  flex: 0 0 auto;
  padding: 4px 8px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: 10px;
  line-height: 1.2;
}

.vd__stats {
  margin: 0 0 8px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.vd__stat dt {
  font-weight: 400;
  font-size: 9px;
  color: rgba(23, 20, 26, 0.72);
}

.vd__stat dd {
  margin: 0;
  font-weight: 700;
  font-size: 11px;
  color: #17141a;
  white-space: nowrap;
}

.vd__scan {
  height: 4px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.12);
  overflow: hidden;
}

.vd__scanbar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: #b9a0ff;
}

.vd__scanbar.is-run {
  animation: vdScan 600ms ease-out both;
}

.vd__calc {
  margin: 8px 0 0;
  font-weight: 400;
  font-size: 10px;
  color: rgba(23, 20, 26, 0.72);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@keyframes vdRise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes vdScan {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}
@media (max-width: 340px) {
  .vd {
    max-width: 280px;
    gap: 4px;
  }
  .vd__hint {
    font-size: 9px;
    line-height: 1.25;
  }
  .vd__zone {
    min-height: 32px;
    padding: 4px;
  }
  .vd__ic {
    width: 20px;
    height: 20px;
  }
  .vd__panel {
    padding: 4px;
  }
  .vd__head {
    margin-bottom: 4px;
  }
  .vd__stats {
    margin-bottom: 4px;
  }
  .vd__stat {
    min-width: 0;
  }
  .vd__stat dd {
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .vd__calc {
    margin-top: 4px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .vd__panel.is-in {
    animation: none;
  }
  .vd__scanbar.is-run {
    animation: none;
    width: 100%;
  }
  .vd__zone, .vd__ic {
    transition: none;
  }
  .vd__zone.is-over .vd__ic {
    transform: none;
  }
}

// 動画をドロップ(02) — video/ 접두사로 통과한 파일을 객체 URL 로 video 요소에 걸고 loadedmetadata 이벤트에서
// duration(秒)·videoWidth·videoHeight 를 읽어, 재생 전에 長さ·해상도를 숫자로 계산해 보여준다.
// ビットレート = 파일크기(비트) ÷ 長さ(秒) — 이 나눗셈이 이 데모의 '계산 한 겹'이다.
// 데모는 MediaRecorder 로 시드 고정 webm Blob(File) 을 만들어 실제 loadedmetadata 파이프라인을 탄다.
(function () {
  var zone = document.getElementById('vdZone');
  var input = document.getElementById('vdInput');
  var panel = document.getElementById('vdPanel');
  var nameEl = document.getElementById('vdName');
  var chipEl = document.getElementById('vdChip');
  var durEl = document.getElementById('vdDur');
  var resEl = document.getElementById('vdRes');
  var brEl = document.getElementById('vdBr');
  var sizeEl = document.getElementById('vdSize');
  var calcEl = document.getElementById('vdCalc');
  var scanbar = document.getElementById('vdScanbar');
  if (!zone || !input || !panel || !nameEl || !chipEl || !durEl || !resEl || !brEl || !sizeEl || !calcEl || !scanbar) return;
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  // 시나리오: 가상 파일 3개 (이름·종류·長さ·解像度·바이트) — loadedmetadata 계산 결과가 파일마다 다르다
  var FILES = [
    { name: 'lecture-week3.mp4', type: 'video/mp4', dur: 128.4, w: 1920, h: 1080, bytes: 469762048 * 0.0957 },
    { name: 'shorts-intro.webm', type: 'video/webm', dur: 27.9, w: 1080, h: 1920, bytes: 10485760 * 0.582 },
    { name: 'demo-4k-clip.mp4', type: 'video/mp4', dur: 64.2, w: 3840, h: 2160, bytes: 1073741824 * 0.0423 }
  ];

  // 사람 단위 환산 — 1024(2의 10제곱) 나눗세(08 과 같은 규칙)
  function human(bytes) {
    var units = ['B', 'KB', 'MB', 'GB'];
    var i = 0, v = bytes;
    while (v >= 1024 && i < units.length - 1) { v /= 1024; i++; }
    return (Math.floor(v * 10) / 10) + ' ' + units[i];
  }

  function paint(name, type, dur, w, h, size) {
    var mbps = (size * 8) / dur / 1000000;      // ビットレート = 비트 ÷ 秒
    nameEl.textContent = name;
    chipEl.textContent = type;
    durEl.textContent = dur.toFixed(1) + '秒';
    resEl.textContent = w + '×' + h;
    brEl.textContent = mbps.toFixed(1) + ' Mbps';
    sizeEl.textContent = human(size);
    calcEl.textContent = human(size) + ' × 8 ÷ ' + dur.toFixed(1) + '秒 =  ' + mbps.toFixed(1) + ' Mbps';
    panel.classList.add('is-in');
    scanbar.classList.remove('is-run');
    void scanbar.offsetWidth;   // 재시작
    scanbar.classList.add('is-run');
  }

  var cur = -1;

  // 시연용 — 스캔 시나리오 값 그대로(가짜 파일의 메타데이터를 실제로 읽을 수단이 없으므로
  // 시나리오 스펙 자체를 그 가상 파일의 '진짜' 메타데이터로 취급한다 — 표시값이 서로 어긋나지 않게)
  function showScenario(p) {
    paint(p.name, p.type, p.dur, p.w, p.h, p.bytes);
  }

  // 실제 드롭 — video 엘리먼트에 objectURL 을 걸고 loadedmetadata 에서 진짜 duration/해상도를 읽는다.
  // File.size 는 항상 실제 값. 진짜 파일이므로 셋이 서로 어긋날 일이 없다.
  function showReal(f) {
    var u = URL.createObjectURL(f);
    var probe = document.createElement('video');
    probe.muted = true;
    probe.onloadedmetadata = function () {
      paint(f.name, f.type, probe.duration, probe.videoWidth, probe.videoHeight, f.size);
      URL.revokeObjectURL(u);
    };
    probe.onerror = function () { URL.revokeObjectURL(u); };
    probe.src = u;
  }


  // 실제 드롭 경로 — File.type 접두사 검사 후 실제 메타데이터 경로(showReal)
  zone.addEventListener('dragover', function (e) { e.preventDefault(); zone.classList.add('is-over'); });
  zone.addEventListener('dragleave', function () { zone.classList.remove('is-over'); });
  zone.addEventListener('drop', function (e) {
    e.preventDefault(); zone.classList.remove('is-over');
    var file = e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files[0];
    // File.type 접두사만 먼저 보고(싸다), 통과하면 메타데이터까지 읽는다(비싸다)
    if (file && file.type && file.type.startsWith('video/')) showReal(file);
  });
  input.addEventListener('change', function () {
    var file = input.files && input.files[0];
    if (file && file.type && file.type.startsWith('video/')) showReal(file);
    input.value = '';
  });

  if (reduce) {
    showScenario(FILES[0]);
  } else {
    var nextAt = 0;
    (function loop(now) {
      if (now >= nextAt) {
        nextAt = now + 2200;
        cur = (cur + 1) % FILES.length;
        showScenario(FILES[cur]);
      }
      requestAnimationFrame(loop);
    })(0);
  }
})();

// DropVideo — vanilla 판(run/337/demo/02-drop-video/index.html) 의 React 포트. video/ 접두사로
// 통과한 파일을 객체 URL 로 video 엘리먼트에 걸고 loadedmetadata 이벤트에서 duration·videoWidth·
// videoHeight 를 읽어 길이·해상도를 계산해 보여준다. 비트레이트 = 파일크기(비트) ÷ 길이(초) — 이
// 나눗셈이 계산 한 겹이다. 자동 시연(시나리오)과 실제 드롭(진짜 File)의 표시 경로를 완전히 분리해
// 둘이 뒤섞여 값이 서로 어긋나는 일이 없게 한다.
import { useEffect, useRef } from "react";
import styles from "./DropVideo.module.scss";

export type DropVideoProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

type Box<T> = { current: T };

const HINT = "video/ 만 통과 — 메타데이터를 먼저 읽어 길이·해상도·비트레이트를 계산합니다";
const ARIA_LABEL = "영상 드롭존";

type VideoSpec = { name: string; type: string; dur: number; w: number; h: number; bytes: number };
const FILES: VideoSpec[] = [
  { name: "lecture-week3.mp4", type: "video/mp4", dur: 128.4, w: 1920, h: 1080, bytes: 469762048 * 0.0957 },
  { name: "shorts-intro.webm", type: "video/webm", dur: 27.9, w: 1080, h: 1920, bytes: 10485760 * 0.582 },
  { name: "demo-4k-clip.mp4", type: "video/mp4", dur: 64.2, w: 3840, h: 2160, bytes: 1073741824 * 0.0423 }
];

// 사람 단위 환산 — 1024(2의 10제곱) 나눗셈
function human(bytes: number): string {
  const units = ["B", "KB", "MB", "GB"];
  let i = 0, v = bytes;
  while (v >= 1024 && i < units.length - 1) { v /= 1024; i++; }
  return Math.floor(v * 10) / 10 + " " + units[i];
}

export default function DropVideo({
  duration = "600ms",
  easing = "ease-out",
  color = "#17141a"
}: DropVideoProps) {
  const zoneRef = useRef<HTMLDivElement | null>(null);
  const inputRef = useRef<HTMLInputElement | null>(null);
  const panelRef = useRef<HTMLDivElement | null>(null);
  const nameRef = useRef<HTMLElement | null>(null);
  const chipRef = useRef<HTMLSpanElement | null>(null);
  const durRef = useRef<HTMLElement | null>(null);
  const resRef = useRef<HTMLElement | null>(null);
  const brRef = useRef<HTMLElement | null>(null);
  const sizeRef = useRef<HTMLElement | null>(null);
  const calcRef = useRef<HTMLElement | null>(null);
  const scanbarRef = useRef<HTMLSpanElement | null>(null);
  const rafRef = useRef(0) as Box<number>;

  useEffect(() => {
    const zone = zoneRef.current;
    const input = inputRef.current;
    const panel = panelRef.current;
    const nameEl = nameRef.current;
    const chipEl = chipRef.current;
    const durEl = durRef.current;
    const resEl = resRef.current;
    const brEl = brRef.current;
    const sizeEl = sizeRef.current;
    const calcEl = calcRef.current;
    const scanbar = scanbarRef.current;
    if (!zone || !input || !panel || !nameEl || !chipEl || !durEl || !resEl || !brEl || !sizeEl || !calcEl || !scanbar) return;
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    function paint(name: string, type: string, dur: number, w: number, h: number, size: number): void {
      const mbps = (size * 8) / dur / 1000000;   // 비트레이트 = 비트 ÷ 초
      nameEl!.textContent = name;
      chipEl!.textContent = type;
      durEl!.textContent = dur.toFixed(1) + "초";
      resEl!.textContent = w + "×" + h;
      brEl!.textContent = mbps.toFixed(1) + " Mbps";
      sizeEl!.textContent = human(size);
      calcEl!.textContent = human(size) + " × 8 ÷ " + dur.toFixed(1) + "초 = " + mbps.toFixed(1) + " Mbps";
      panel!.classList.add(styles.panelIn);
      scanbar!.classList.remove(styles.scanbarRun);
      void scanbar!.offsetWidth;   // 재시작
      scanbar!.classList.add(styles.scanbarRun);
    }

    // 시연용 — 시나리오 값 그대로(가상 파일의 메타데이터를 실제로 읽을 수단이 없으므로 시나리오
    // 스펙 자체를 그 가상 파일의 '진짜' 메타데이터로 취급 — 표시값이 서로 어긋나지 않게)
    function showScenario(p: VideoSpec): void {
      paint(p.name, p.type, p.dur, p.w, p.h, p.bytes);
    }

    // 실제 드롭 — video 엘리먼트에 objectURL 을 걸고 loadedmetadata 에서 진짜 duration/해상도를
    // 읽는다. File.size 는 항상 실제 값. 진짜 파일이므로 셋이 서로 어긋날 일이 없다.
    function showReal(f: File): void {
      const u = URL.createObjectURL(f);
      const probe = document.createElement("video");
      probe.muted = true;
      probe.onloadedmetadata = () => {
        paint(f.name, f.type, probe.duration, probe.videoWidth, probe.videoHeight, f.size);
        URL.revokeObjectURL(u);
      };
      probe.onerror = () => { URL.revokeObjectURL(u); };
      probe.src = u;
    }

    function onOver(e: DragEvent): void {
      e.preventDefault();
      zone!.classList.add(styles.zoneOver);
    }
    function onLeave(): void {
      zone!.classList.remove(styles.zoneOver);
    }
    function onDrop(e: DragEvent): void {
      e.preventDefault();
      zone!.classList.remove(styles.zoneOver);
      const f = e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files[0];
      if (f && f.type && f.type.indexOf("video/") === 0) showReal(f);
    }
    function onChange(): void {
      const f = input!.files && input!.files[0];
      if (f && f.type && f.type.indexOf("video/") === 0) showReal(f);
      input!.value = "";
    }
    zone.addEventListener("dragover", onOver as EventListener);
    zone.addEventListener("dragleave", onLeave);
    zone.addEventListener("drop", onDrop as EventListener);
    input.addEventListener("change", onChange);

    let cur = -1;
    if (reduce) {
      showScenario(FILES[0]);
    } else {
      let nextAt = 0;
      const step = (now: number): void => {
        if (now >= nextAt) {
          nextAt = now + 2200;
          cur = (cur + 1) % FILES.length;
          showScenario(FILES[cur]);
        }
        rafRef.current = requestAnimationFrame(step);
      };
      rafRef.current = requestAnimationFrame(step);
    }

    return () => {
      cancelAnimationFrame(rafRef.current);
      zone.removeEventListener("dragover", onOver as EventListener);
      zone.removeEventListener("dragleave", onLeave);
      zone.removeEventListener("drop", onDrop as EventListener);
      input.removeEventListener("change", onChange);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.vd}>
        <p className={styles.hint} id="vdHintReact">{HINT}</p>
        <div
          className={styles.zone}
          ref={zoneRef}
          role="button"
          tabIndex={0}
          aria-describedby="vdHintReact"
          aria-label={ARIA_LABEL}
        >
          <input type="file" accept="video/*" className={styles.file} ref={inputRef} aria-label="파일 선택" />
          <svg className={styles.ic} viewBox="0 0 256 256" aria-hidden="true">
            <g fill="currentColor">
              <path d="M200 72v112a8 8 0 0 1-8 8H32a8 8 0 0 1-8-8V72a8 8 0 0 1 8-8h160a8 8 0 0 1 8 8" opacity=".2" />
              <path d="M251.77 73a8 8 0 0 0-8.21.39L208 97.05V72a16 16 0 0 0-16-16H32a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16v-25l35.56 23.71A8 8 0 0 0 248 184a8 8 0 0 0 8-8V80a8 8 0 0 0-4.23-7M192 184H32V72h160zm48-22.95l-32-21.33v-23.44L240 95Z" />
            </g>
          </svg>
        </div>
        <div className={styles.panel} ref={panelRef} aria-live="polite">
          <div className={styles.head}>
            <b className={styles.name} ref={nameRef} style={{ color }}>lecture-week3.mp4</b>
            <span className={styles.chip} ref={chipRef}>video/mp4</span>
          </div>
          <dl className={styles.stats}>
            <div className={styles.stat}><dt>길이</dt><dd ref={durRef}>128.4초</dd></div>
            <div className={styles.stat}><dt>해상도</dt><dd ref={resRef}>1920×1080</dd></div>
            <div className={styles.stat}><dt>비트레이트</dt><dd ref={brRef}>2.8 Mbps</dd></div>
            <div className={styles.stat}><dt>크기</dt><dd ref={sizeRef}>44.9 MB</dd></div>
          </dl>
          <div className={styles.scan} aria-hidden="true"><span className={styles.scanbar} ref={scanbarRef} /></div>
          <p className={styles.calc} ref={calcRef}>44.9 MB × 8 ÷ 128.4초 = 2.8 Mbps</p>
        </div>
      </div>
    </main>
  );
}