01기본 힘 배치 — 척력과 스프링만으로 흩어진 점이 정돈된다

<main class="stage">
<div class="ga is-demo" id="gaRoot" role="application" aria-label="힘 배치 관계도 실험판" tabindex="0">
  <canvas class="ga__cv" id="gaCv"></canvas>
  <p class="ga__hint">
    <span class="ga__title">기본 힘 배치</span>
    <span class="ga__desc">척력과 스프링 힘만으로 흩어진 점이 저절로 정돈됩니다</span>
  </p>
  <div class="ga__bar">
    <span class="ga__meta">노드 18개 · 척력+스프링 · rAF</span>
    <span class="ga__meta ga__meta--dim">arc · lineTo · Math.hypot</span>
  </div>
</div>
</main>

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

// 기본 힘 배치(01) — @keyframes 를 두지 않는다. 움직임은 전부 캔버스 rAF 루프
// (매 프레임 척력·스프링 재계산)가 만든다. 무대 잉크 — 어두운 판 위 파스텔 노드.

$ga-stage: #1a1720;
@include stage($ga-stage);

$ga-panel: #241f2d;   // 캔버스 바닥 — 무대보다 한 단계 밝은 먹보라
$ga-text:  #d5cfe6;   // 라벨 글자 — 밝은 라일락 회색
$ga-edge:  #6f6a82;   // 링크 선 — 저채도 회보라
$ga-node:  #cfd9e7;   // 노드 — 파스텔 아이리스 블루
$ga-glow:  #e8d5e2;   // 노드 둘레 광 — 벚꽃 파스텔

$duration: $dur-loop;
$easing: $ease-out;
$color: $ga-node;

.ga {
  --ga-panel: #{$ga-panel};
  --ga-edge:  #{$ga-edge};
  --ga-node:  #{$ga-node};
  --ga-glow:  #{$ga-glow};

  position: relative;
  display: flex; flex-direction: column;
  width: 100%; height: 100%; min-height: 164px;
  overflow: hidden;
}

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

.ga__hint {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; gap: 0; margin: 0;
  padding: $sp-2 $sp-3 0;
  font-weight: 700; font-size: clamp(10px, 2.8vw, 12px); line-height: 1.35;
  color: $ga-text;
}
.ga__title { text-shadow: 0 1px 6px rgba($ga-panel, 1); }
.ga__desc {
  margin-top: $sp-1;
  font-weight: 500; font-size: clamp(9px, 2.4vw, 10px); line-height: 1.4;
  color: rgba($ga-text, .78);
  text-shadow: 0 1px 6px rgba($ga-panel, 1);
}

.ga__bar {
  position: relative; z-index: 1;
  margin-top: auto;
  display: flex; align-items: baseline; justify-content: space-between; gap: $sp-2;
  padding: 0 $sp-3 $sp-2;
}
.ga__meta {
  font-size: 10px; font-weight: 500; color: rgba($ga-text, .78);
  background: rgba($ga-panel, .8);
  border-radius: $r-xs;
  padding: 4px $sp-1;
}

.ga:focus-visible { outline: 2px solid $ga-node; outline-offset: -2px; }

@media (max-width: 340px) {
  .ga__meta--dim { display: none; }
}

// reduce — rAF 를 돌리지 않고 정착된 배치 한 장만 남는다.
@media (prefers-reduced-motion: reduce) {
  .ga.is-still { cursor: default !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #1a1720;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ga {
  --ga-panel: #241f2d;
  --ga-edge: #6f6a82;
  --ga-node: #cfd9e7;
  --ga-glow: #e8d5e2;
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-height: 164px;
  overflow: hidden;
}

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

.ga__hint {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 0;
  padding: 8px 12px 0;
  font-weight: 700;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.35;
  color: #d5cfe6;
}

.ga__title {
  text-shadow: 0 1px 6px #241f2d;
}

.ga__desc {
  margin-top: 4px;
  font-weight: 500;
  font-size: clamp(9px, 2.4vw, 10px);
  line-height: 1.4;
  color: rgba(213, 207, 230, 0.78);
  text-shadow: 0 1px 6px #241f2d;
}

.ga__bar {
  position: relative;
  z-index: 1;
  margin-top: auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 0 12px 8px;
}

.ga__meta {
  font-size: 10px;
  font-weight: 500;
  color: rgba(213, 207, 230, 0.78);
  background: rgba(36, 31, 45, 0.8);
  border-radius: 4px;
  padding: 4px 4px;
}

.ga:focus-visible {
  outline: 2px solid #cfd9e7;
  outline-offset: -2px;
}

@media (max-width: 340px) {
  .ga__meta--dim {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ga.is-still {
    cursor: default !important;
  }
}

// 기본 힘 배치(01) — 모든 노드 쌍의 척력(쿨롱형)과 엣지의 스프링(훅 법칙)을
// 매 프레임 합산해 좌표 자체를 다시 계산한다. 속성 트윈이 아니라 계산으로 움직인다.
// 흩어진 시작점에서 출발해 실시간으로 정돈된 그림으로 수렴하고, 수렴한 뒤에도
// 아주 약한 무작위 힘(온도)을 계속 더해 화면이 완전히 멈추지 않게 한다.
(function () {
  // ── 변형 상수 블록 — 아래 값 하나만 바꿔 변형을 만든다 ──
  var N = 18;             // 노드 개수
  var ATTRACT = 0.02;     // 스프링 강도(k) — 변형 1: 0.02 → 0.08
  var REPEL = 900;        // 척력 강도
  // ────────────────────────────────────────────────────
  var REST = 46;          // 스프링 목표 길이
  var DAMP = 0.955;       // 속도 감쇠 — 낮출수록 오래 출렁인다
  var CENTER_K = 0.0009;  // 중심으로 약하게 당기는 힘 — 그래프가 화면 밖으로 흘러가지 않게
  var JITTER = 50;        // 항상 더하는 무작위 힘(온도) — 화면 전역이 계속 출렁이게 한다
  var NR = 5;             // 노드 반지름
  var OMEGA = 0.5;        // 전체를 중심 기준 아주 천천히 돌리는 각속도(rad/s) — 화면 넓게 훑는다

  var root = document.getElementById('gaRoot');
  var cvEl = document.getElementById('gaCv');
  if (!root || !cvEl) return;

  var css = getComputedStyle(root);
  function tokRGB(name) {
    var s = css.getPropertyValue(name).trim();
    var hx = s.length === 4
      ? s.charAt(1) + s.charAt(1) + s.charAt(2) + s.charAt(2) + s.charAt(3) + s.charAt(3)
      : s.slice(1);
    return [parseInt(hx.slice(0, 2), 16), parseInt(hx.slice(2, 4), 16), parseInt(hx.slice(4, 6), 16)];
  }
  var C_PANEL = tokRGB('--ga-panel');
  var C_EDGE  = tokRGB('--ga-edge');
  var C_NODE  = tokRGB('--ga-node');
  var C_GLOW  = tokRGB('--ga-glow');

  var ctx = cvEl.getContext('2d');
  var W = 0, H = 0, dpr = Math.min(window.devicePixelRatio || 1, 2);

  function makeRand(seed) {
    var st = seed >>> 0;
    return function () {
      st = (st + 0x6D2B79F5) >>> 0;
      var t = st;
      t = Math.imul(t ^ (t >>> 15), t | 1);
      t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
      return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
    };
  }
  var rand = makeRand(0x327001);

  var px, py, vx, vy, edges;

  function buildGraph() {
    px = new Float32Array(N); py = new Float32Array(N);
    vx = new Float32Array(N); vy = new Float32Array(N);
    for (var i = 0; i < N; i++) {
      px[i] = rand() * W; py[i] = rand() * H;
    }
    edges = [];
    for (var a = 1; a < N; a++) {
      edges.push([a, Math.floor(rand() * a)]);   // 스패닝 트리 — 모든 노드가 연결된다
    }
    var extra = Math.round(N * 0.5);
    for (var k = 0; k < extra; k++) {
      var u = Math.floor(rand() * N), v = Math.floor(rand() * N);
      if (u !== v) edges.push([u, v]);
    }
  }

  function fit() {
    var r = root.getBoundingClientRect();
    W = Math.round(r.width); H = Math.round(r.height);
    cvEl.width = Math.round(W * dpr); cvEl.height = Math.round(H * dpr);
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
    buildGraph();
  }

  function step(dt) {
    var fx = new Float32Array(N), fy = new Float32Array(N);
    for (var i = 0; i < N; i++) {
      for (var j = i + 1; j < N; j++) {
        var dx = px[j] - px[i], dy = py[j] - py[i];
        var d2 = dx * dx + dy * dy; if (d2 < 4) d2 = 4;
        var d = Math.sqrt(d2);
        var f = REPEL / d2;
        var ux = dx / d, uy = dy / d;
        fx[i] -= ux * f; fy[i] -= uy * f;
        fx[j] += ux * f; fy[j] += uy * f;
      }
    }
    for (var e = 0; e < edges.length; e++) {
      var a = edges[e][0], b = edges[e][1];
      var dx2 = px[b] - px[a], dy2 = py[b] - py[a];
      var d3 = Math.hypot(dx2, dy2) || 0.001;
      var diff = (d3 - REST) * ATTRACT;
      var ux2 = dx2 / d3, uy2 = dy2 / d3;
      fx[a] += ux2 * diff; fy[a] += uy2 * diff;
      fx[b] -= ux2 * diff; fy[b] -= uy2 * diff;
    }
    var cx = W / 2, cy = H / 2;
    for (var n = 0; n < N; n++) {
      fx[n] += (cx - px[n]) * CENTER_K;
      fy[n] += (cy - py[n]) * CENTER_K;
      fx[n] += (rand() - 0.5) * JITTER;
      fy[n] += (rand() - 0.5) * JITTER;
      vx[n] = (vx[n] + fx[n] * dt) * DAMP;
      vy[n] = (vy[n] + fy[n] * dt) * DAMP;
      px[n] += vx[n] * dt; py[n] += vy[n] * dt;
    }
  }

  function rotateAll(dtheta) {
    var cx = W / 2, cy = H / 2, cs = Math.cos(dtheta), sn = Math.sin(dtheta);
    for (var i = 0; i < N; i++) {
      var rx = px[i] - cx, ry = py[i] - cy;
      px[i] = cx + rx * cs - ry * sn;
      py[i] = cy + rx * sn + ry * cs;
    }
  }

  function draw(t) {
    ctx.clearRect(0, 0, W, H);
    ctx.fillStyle = 'rgb(' + C_PANEL.join(',') + ')';
    ctx.fillRect(0, 0, W, H);

    ctx.lineWidth = 1.2;
    ctx.strokeStyle = 'rgba(' + C_EDGE.join(',') + ',0.55)';
    ctx.beginPath();
    for (var e = 0; e < edges.length; e++) {
      var a = edges[e][0], b = edges[e][1];
      ctx.moveTo(px[a], py[a]); ctx.lineTo(px[b], py[b]);
    }
    ctx.stroke();

    for (var i = 0; i < N; i++) {
      var pulse = 0.5 + 0.5 * Math.sin(t * 2.2 + i * 0.7);
      ctx.fillStyle = 'rgba(' + C_GLOW.join(',') + ',' + (0.24 + 0.2 * pulse).toFixed(3) + ')';
      ctx.beginPath(); ctx.arc(px[i], py[i], NR + 4 + pulse * 7, 0, Math.PI * 2); ctx.fill();
      ctx.fillStyle = 'rgb(' + C_NODE.join(',') + ')';
      ctx.beginPath(); ctx.arc(px[i], py[i], NR, 0, Math.PI * 2); ctx.fill();
    }
  }

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var t0 = -1, last = -1;
  function frame(now) {
    if (t0 < 0) { t0 = now; last = now; }
    var dt = Math.min((now - last) / 1000, 0.05); last = now;
    var t = (now - t0) / 1000;
    step(dt);
    rotateAll(OMEGA * dt);
    draw(t);
    requestAnimationFrame(frame);
  }
  window.addEventListener('resize', function () {
    fit();
    if (reduce) settle();
  });

  function settle() {
    for (var s = 0; s < 260; s++) step(1 / 60);
    draw(0);
  }

  fit();
  if (reduce) {
    settle();
    root.classList.add('is-still');
  } else {
    requestAnimationFrame(frame);
  }
})();

// GraphForceBasicSpring — vanilla 판(run/327/demo/01-graph-force-basic-spring/index.html) 의 React 포트.
// 모든 노드 쌍의 척력(쿨롱형)과 엣지의 스프링(훅 법칙)을 매 프레임 합산해 좌표 자체를 다시 계산한다.
// 속성 트윈이 아니라 계산으로 움직인다. 흩어진 시작점에서 정돈된 그림으로 수렴하고, 수렴한 뒤에도
// 아주 약한 무작위 힘(온도)을 계속 더해 화면이 완전히 멈추지 않는다. 전체는 rotateAll 로 천천히 강체 회전한다.
import { useEffect, useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./GraphForceBasicSpring.module.scss";

export type GraphForceBasicSpringProps = {
  duration?: string;
  easing?: string;
  color?: string;
  n?: number;        // 노드 개수
  attract?: number;  // 스프링 강도(k) — 변형 1: 0.02 → 0.08
  repel?: number;    // 척력 강도
};

// ── 변형 상수(기본값) — vanilla 판과 동일 ──
const N       = 18;
const ATTRACT = 0.02;
const REPEL   = 900;
const REST      = 46;     // 스프링 목표 길이
const DAMP      = 0.955;  // 속도 감쇠 — 낮출수록 오래 출렁인다
const CENTER_K  = 0.0009; // 중심으로 약하게 당기는 힘
const JITTER    = 50;     // 항상 더하는 무작위 힘(온도)
const NR        = 5;      // 노드 반지름
const OMEGA     = 0.5;    // 전체를 중심 기준 천천히 돌리는 각속도(rad/s)
const SEED      = 0x327001;

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type Box<T> = { current: T };
type RGB = [number, number, number];

const BOARD_LABEL = "힘 배치 관계도 실험판";
const META_LEFT = "노드 18개 · 척력+스프링 · rAF";
const META_RIGHT = "arc · lineTo · Math.hypot";
const HINT_TITLE = "기본 힘 배치";
const HINT_DESC = "척력과 스프링 힘만으로 흩어진 점이 저절로 정돈됩니다";

function makeRand(seed: number): () => number {
  let st = seed >>> 0;
  return function () {
    st = (st + 0x6d2b79f5) >>> 0;
    let t = st;
    t = Math.imul(t ^ (t >>> 15), t | 1);
    t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };
}

export default function GraphForceBasicSpring({
  duration = "2s",
  easing = "ease-out",
  color = "#cfd9e7",
  n = N,
  attract = ATTRACT,
  repel = REPEL
}: GraphForceBasicSpringProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);
  const cvRef = useRef<HTMLCanvasElement | null>(null);
  const ctxRef = useRef<CanvasRenderingContext2D | null>(null);
  const colRef = useRef<{ panel: RGB; edge: RGB; node: RGB; glow: RGB } | null>(null);
  const wRef = useRef(0) as Box<number>;
  const hRef = useRef(0) as Box<number>;
  const rafRef = useRef(0) as Box<number>;
  const randRef = useRef(makeRand(SEED)) as Box<() => number>;
  const pxRef = useRef<Float32Array | null>(null);
  const pyRef = useRef<Float32Array | null>(null);
  const vxRef = useRef<Float32Array | null>(null);
  const vyRef = useRef<Float32Array | null>(null);
  const edgesRef = useRef<[number, number][]>([]);
  const [still, setStill] = useState(false);
  const vars: Vars = { "--duration": duration, "--easing": easing, "--color": color };

  function reduced(): boolean {
    return window.matchMedia("(prefers-reduced-motion: reduce)").matches;
  }

  function tokRGB(root: HTMLDivElement, name: string): RGB {
    const s = getComputedStyle(root).getPropertyValue(name).trim();
    const hx = s.length === 4
      ? s.charAt(1) + s.charAt(1) + s.charAt(2) + s.charAt(2) + s.charAt(3) + s.charAt(3)
      : s.slice(1);
    return [parseInt(hx.slice(0, 2), 16), parseInt(hx.slice(2, 4), 16), parseInt(hx.slice(4, 6), 16)];
  }

  function buildGraph(): void {
    const rand = randRef.current;
    const W = wRef.current, H = hRef.current;
    const px = new Float32Array(n), py = new Float32Array(n);
    const vx = new Float32Array(n), vy = new Float32Array(n);
    for (let i = 0; i < n; i++) {
      px[i] = rand() * W; py[i] = rand() * H;
    }
    const edges: [number, number][] = [];
    for (let a = 1; a < n; a++) {
      edges.push([a, Math.floor(rand() * a)]);   // 스패닝 트리 — 모든 노드가 연결된다
    }
    const extra = Math.round(n * 0.5);
    for (let k = 0; k < extra; k++) {
      const u = Math.floor(rand() * n), v = Math.floor(rand() * n);
      if (u !== v) edges.push([u, v]);
    }
    pxRef.current = px; pyRef.current = py; vxRef.current = vx; vyRef.current = vy;
    edgesRef.current = edges;
  }

  function fit(): void {
    const root = rootRef.current;
    const cv = cvRef.current;
    const ctx = ctxRef.current;
    if (!root || !cv || !ctx) return;
    const r = root.getBoundingClientRect();
    const dpr = Math.min(window.devicePixelRatio || 1, 2);
    wRef.current = Math.round(r.width);
    hRef.current = Math.round(r.height);
    cv.width = Math.round(wRef.current * dpr);
    cv.height = Math.round(hRef.current * dpr);
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
    buildGraph();
  }

  function step(dt: number): void {
    const px = pxRef.current, py = pyRef.current, vx = vxRef.current, vy = vyRef.current;
    const edges = edgesRef.current;
    const rand = randRef.current;
    const W = wRef.current, H = hRef.current;
    if (!px || !py || !vx || !vy || !edges) return;
    const fx = new Float32Array(n), fy = new Float32Array(n);
    for (let i = 0; i < n; i++) {
      for (let j = i + 1; j < n; j++) {
        const dx = px[j] - px[i], dy = py[j] - py[i];
        let d2 = dx * dx + dy * dy; if (d2 < 4) d2 = 4;
        const d = Math.sqrt(d2);
        const f = repel / d2;
        const ux = dx / d, uy = dy / d;
        fx[i] -= ux * f; fy[i] -= uy * f;
        fx[j] += ux * f; fy[j] += uy * f;
      }
    }
    for (let e = 0; e < edges.length; e++) {
      const a = edges[e][0], b = edges[e][1];
      const dx2 = px[b] - px[a], dy2 = py[b] - py[a];
      const d3 = Math.hypot(dx2, dy2) || 0.001;
      const diff = (d3 - REST) * attract;
      const ux2 = dx2 / d3, uy2 = dy2 / d3;
      fx[a] += ux2 * diff; fy[a] += uy2 * diff;
      fx[b] -= ux2 * diff; fy[b] -= uy2 * diff;
    }
    const cx = W / 2, cy = H / 2;
    for (let i = 0; i < n; i++) {
      fx[i] += (cx - px[i]) * CENTER_K;
      fy[i] += (cy - py[i]) * CENTER_K;
      fx[i] += (rand() - 0.5) * JITTER;
      fy[i] += (rand() - 0.5) * JITTER;
      vx[i] = (vx[i] + fx[i] * dt) * DAMP;
      vy[i] = (vy[i] + fy[i] * dt) * DAMP;
      px[i] += vx[i] * dt; py[i] += vy[i] * dt;
    }
  }

  function rotateAll(dtheta: number): void {
    const px = pxRef.current, py = pyRef.current;
    if (!px || !py) return;
    const W = wRef.current, H = hRef.current;
    const cx = W / 2, cy = H / 2, cs = Math.cos(dtheta), sn = Math.sin(dtheta);
    for (let i = 0; i < n; i++) {
      const rx = px[i] - cx, ry = py[i] - cy;
      px[i] = cx + rx * cs - ry * sn;
      py[i] = cy + rx * sn + ry * cs;
    }
  }

  function draw(t: number): void {
    const ctx = ctxRef.current;
    const col = colRef.current;
    const px = pxRef.current, py = pyRef.current;
    const edges = edgesRef.current;
    const W = wRef.current, H = hRef.current;
    const rand = randRef.current;
    if (!ctx || !col || !px || !py || !edges) return;
    ctx.clearRect(0, 0, W, H);
    ctx.fillStyle = "rgb(" + col.panel.join(",") + ")";
    ctx.fillRect(0, 0, W, H);

    ctx.lineWidth = 1.2;
    ctx.strokeStyle = "rgba(" + col.edge.join(",") + ",0.55)";
    ctx.beginPath();
    for (let e = 0; e < edges.length; e++) {
      const a = edges[e][0], b = edges[e][1];
      ctx.moveTo(px[a], py[a]); ctx.lineTo(px[b], py[b]);
    }
    ctx.stroke();

    for (let i = 0; i < n; i++) {
      const pulse = 0.5 + 0.5 * Math.sin(t * 2.2 + i * 0.7);
      ctx.fillStyle = "rgba(" + col.glow.join(",") + "," + (0.24 + 0.2 * pulse).toFixed(3) + ")";
      ctx.beginPath(); ctx.arc(px[i], py[i], NR + 4 + pulse * 7, 0, Math.PI * 2); ctx.fill();
      ctx.fillStyle = "rgb(" + col.node.join(",") + ")";
      ctx.beginPath(); ctx.arc(px[i], py[i], NR, 0, Math.PI * 2); ctx.fill();
    }
  }

  function settle(): void {
    for (let s = 0; s < 260; s++) step(1 / 60);
    draw(0);
  }

  let t0 = -1, last = -1;
  function frame(now: number): void {
    if (t0 < 0) { t0 = now; last = now; }
    const dt = Math.min((now - last) / 1000, 0.05); last = now;
    const t = (now - t0) / 1000;
    step(dt);
    rotateAll(OMEGA * dt);
    draw(t);
    rafRef.current = requestAnimationFrame(frame);
  }

  useEffect(() => {
    const root = rootRef.current;
    const cv = cvRef.current;
    if (!root || !cv) return;
    colRef.current = {
      panel: tokRGB(root, "--ga-panel"),
      edge: tokRGB(root, "--ga-edge"),
      node: tokRGB(root, "--ga-node"),
      glow: tokRGB(root, "--ga-glow")
    };
    ctxRef.current = cv.getContext("2d");
    fit();
    function onResize(): void {
      fit();
      if (reduced()) settle();
    }
    window.addEventListener("resize", onResize);
    if (reduced()) {
      settle();
      setStill(true);
    } else {
      t0 = -1; last = -1;
      rafRef.current = requestAnimationFrame(frame);
    }
    return () => {
      window.removeEventListener("resize", onResize);
      cancelAnimationFrame(rafRef.current);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [n, attract, repel]);

  const rootCls = still ? `${styles.root} ${styles.isStill}` : styles.root;

  return (
    <main className={styles.stage}>
      <div
        className={rootCls}
        ref={rootRef}
        style={vars}
        role="application"
        aria-label={BOARD_LABEL}
        tabIndex={0}
      >
        <canvas className={styles.cv} ref={cvRef}></canvas>
        <p className={styles.hint}>
          <span className={styles.title}>{HINT_TITLE}</span>
          <span className={styles.desc}>{HINT_DESC}</span>
        </p>
        <div className={styles.bar}>
          <span className={styles.meta}>{META_LEFT}</span>
          <span className={styles.metaDim}>{META_RIGHT}</span>
        </div>
      </div>
    </main>
  );
}