07항목 편집기 — 이름 줄과 칸 각도가 함께 다시 계산되는 판

<main class="stage">
<div class="ed" id="ed">
  <p class="ed__hint">이름을 고치면 칸 각도와 글자 크기가 함께 다시 계산됩니다 — measureText 이분 탐색</p>
  <div class="ed__row">
    <div class="ed__field" id="field" role="application" aria-label="항목 편집기 실험판" tabindex="0">
      <canvas class="ed__cv" id="cv"></canvas>
    </div>
    <div class="ed__side">
      <div class="ed__inputs" id="inputs"></div>
      <button class="ed__btn" id="btn" type="button">칸 추가</button>
      <p class="ed__meta">지금 <b class="ed__count" id="cnt">4</b><span class="ed__metaUnit">칸</span></p>
      <p class="ed__meta">드래그로 돌리고 놓으면 돌아갑니다</p>
    </div>
  </div>
</div>
</main>

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

// 항목 편집기(07) — 움직임은 전부 캔버스 rAF 루프다. CSS @keyframes 를 두지 않는다.
// 무대는 주황 무대의 파스텔 변형 — 무대 주황 토큰 대신 연한 피치 톤(채도 .43 · 명도 .84).
// 입력칸은 무대색보다 한 단계 밝은 크림 면 위에 잉크 글자.

$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-blue;

@include stage(#f2d8c8);

.ed {
  --w1: #b3bfd4;   // 파랑빛 파스텔 — 칸
  --w2: #d9c48f;   // 골드 파스텔
  --w3: #a9c4b0;   // 세이지 파스텔
  --w4: #c2a8d1;   // 플럼 파스텔
  --w5: #d8a3b4;   // 로즈 파스텔
  --ink: #{$subject-ink};
  --cream: #{$subject-cream};

  display: flex; flex-direction: column; gap: $sp-2;
  width: 100%; max-width: 420px;
}

.ed__hint {
  margin: 0; font-weight: 700; font-size: clamp(10px, 2.8vw, 12px); line-height: 1.35;
  color: $subject-ink;
}

.ed__row { display: flex; gap: $sp-2; align-items: stretch; }

.ed__field {
  position: relative; overflow: hidden;
  flex: 0 0 auto;
  width: clamp(176px, 46vw, 232px);
  height: clamp(176px, 46vw, 232px);
  border-radius: $r-card;
  background: rgba($subject-ink, .05);
  box-shadow: inset 0 0 0 1px rgba($subject-ink, .16);
  cursor: grab; touch-action: none;
}
.ed__field:active { cursor: grabbing; }
.ed__field:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

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

.ed__side {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; gap: $sp-1;
  padding-top: $sp-1;
}
.ed__inputs { display: flex; flex-direction: column; gap: $sp-1; }
.ed__lab { display: block; }
.ed__inp {
  box-sizing: border-box; width: 100%;
  border: 0; border-radius: $r-xs;
  padding: $sp-1 $sp-2;
  background: $subject-cream;
  color: $subject-ink;
  font-weight: 600; font-size: 11px; line-height: 1.4;
  font-family: inherit;
  box-shadow: inset 0 0 0 1px rgba($subject-ink, .2);
}
.ed__inp:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

.ed__btn {
  border: 0; cursor: pointer;
  border-radius: $r-xs;
  padding: $sp-1 $sp-2;
  background: $subject-blue-deep; color: $subject-cream;
  font-weight: 700; font-size: 11px; line-height: 1.2;
  font-family: inherit;
}
.ed__btn:disabled { opacity: .45; cursor: default; }
.ed__btn:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

.ed__meta { margin: $sp-1 0 0; font-size: clamp(9px, 2.4vw, 11px); line-height: 1.5; color: rgba($subject-ink, .82); }
.ed__meta b { font-weight: 700; color: $subject-blue-deep; font-variant-numeric: tabular-nums; margin-right: $sp-1; }
.ed__metaUnit { color: rgba($subject-ink, .72); }

@media (max-width: 340px) {
  .ed__hint { font-size: 8px; line-height: 1.3; }
  .ed { gap: $sp-1; }
  .ed__field { width: 150px; height: 150px; }
  .ed__meta { margin-top: 0; font-size: 8px; }
  .ed__inp, .ed__btn { padding: 4px 8px; font-size: 8px; line-height: 1.1; }
  .ed__inputs { gap: 0; }
  .ed__side { gap: 0; }
}

// reduce — 루프가 안 돈다. 7칸으로 늘어난 정지 한 장이 남는다.
@media (prefers-reduced-motion: reduce) {
  .ed.is-still .ed__field { cursor: default !important; }
  .ed.is-still .ed__btn { cursor: default; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #f2d8c8;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ed {
  --w1: #b3bfd4;
  --w2: #d9c48f;
  --w3: #a9c4b0;
  --w4: #c2a8d1;
  --w5: #d8a3b4;
  --ink: #17141a;
  --cream: #fff7e6;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 420px;
}

.ed__hint {
  margin: 0;
  font-weight: 700;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.35;
  color: #17141a;
}

.ed__row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.ed__field {
  position: relative;
  overflow: hidden;
  flex: 0 0 auto;
  width: clamp(176px, 46vw, 232px);
  height: clamp(176px, 46vw, 232px);
  border-radius: 16px;
  background: rgba(23, 20, 26, 0.05);
  box-shadow: inset 0 0 0 1px rgba(23, 20, 26, 0.16);
  cursor: grab;
  touch-action: none;
}

.ed__field:active {
  cursor: grabbing;
}

.ed__field:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

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

.ed__side {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 4px;
}

.ed__inputs {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ed__lab {
  display: block;
}

.ed__inp {
  box-sizing: border-box;
  width: 100%;
  border: 0;
  border-radius: 4px;
  padding: 4px 8px;
  background: #fff7e6;
  color: #17141a;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.4;
  font-family: inherit;
  box-shadow: inset 0 0 0 1px rgba(23, 20, 26, 0.2);
}

.ed__inp:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.ed__btn {
  border: 0;
  cursor: pointer;
  border-radius: 4px;
  padding: 4px 8px;
  background: #0a4fe8;
  color: #fff7e6;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.2;
  font-family: inherit;
}

.ed__btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.ed__btn:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.ed__meta {
  margin: 4px 0 0;
  font-size: clamp(9px, 2.4vw, 11px);
  line-height: 1.5;
  color: rgba(23, 20, 26, 0.82);
}

.ed__meta b {
  font-weight: 700;
  color: #0a4fe8;
  font-variant-numeric: tabular-nums;
  margin-right: 4px;
}

.ed__metaUnit {
  color: rgba(23, 20, 26, 0.72);
}

@media (max-width: 340px) {
  .ed__hint {
    font-size: 8px;
    line-height: 1.3;
  }
  .ed {
    gap: 4px;
  }
  .ed__field {
    width: 150px;
    height: 150px;
  }
  .ed__meta {
    margin-top: 0;
    font-size: 8px;
  }
  .ed__inp, .ed__btn {
    padding: 4px 8px;
    font-size: 8px;
    line-height: 1.1;
  }
  .ed__inputs {
    gap: 0;
  }
  .ed__side {
    gap: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ed.is-still .ed__field {
    cursor: default !important;
  }
  .ed.is-still .ed__btn {
    cursor: default;
  }
}

// 항목 편집기(07) — 이름을 치면 measureText 로 폭을 재고 칸 호 길이에 맞게 글자 크기를
// 이분 탐색으로 줄인다. 줄이 늘고 줄어들 때마다 각도 분할과 배치를 전부 다시 계산해
// 판이 편집 내용을 그대로 따라간다.
(function () {
  var root = document.getElementById('ed');
  var field = document.getElementById('field');
  var cv = document.getElementById('cv');
  var inputsEl = document.getElementById('inputs');
  var btnEl = document.getElementById('btn');
  var cntEl = document.getElementById('cnt');
  if (!root || !field || !cv || !inputsEl || !btnEl || !cntEl) return;
  var ctx = cv.getContext('2d');
  var css = getComputedStyle(root);
  var PAL = [];
  for (var i = 1; i <= 5; i++) PAL.push(css.getPropertyValue('--w' + i).trim());
  var INK = css.getPropertyValue('--ink').trim();
  var CREAM = css.getPropertyValue('--cream').trim();
  var TAU = Math.PI * 2;
  var entries = ['김하늘', '이준호', '박서연', '최도윤'];
  var MAXN = 7;

  var ang = -0.4, vel = 0;
  var FRICTION = 0.32, STOP = 0.5;
  var settle = -1, pulse = -1, dpr = 1;
  var flicks = [8, -10, 6.5];
  var fi = 1, idle = 0;

  function fit() {
    var w = field.clientWidth, h = field.clientHeight;
    dpr = Math.min(2, window.devicePixelRatio || 1);
    cv.width = Math.round(w * dpr); cv.height = Math.round(h * dpr);
  }
  function norm(a) { a %= TAU; return a < 0 ? a + TAU : a; }

  // 호 길이에 맞는 글자 크기 — 이분 탐색. measureText 로 폭을 재며 경계를 좁힌다
  function fitFont(text, arcLen) {
    var lo = 6, hi = 15, best = 6;
    for (var it = 0; it < 7; it++) {
      var mid = (lo + hi) / 2;
      ctx.font = '700 ' + mid + 'px sans-serif';
      if (ctx.measureText(text).width <= arcLen) { best = mid; lo = mid; } else { hi = mid; }
    }
    return best;
  }

  function draw() {
    var w = cv.width / dpr, h = cv.height / dpr;
    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
    ctx.clearRect(0, 0, w, h);
    var n = entries.length, seg = TAU / n;
    var cx = w / 2, cy = h / 2, R = Math.min(w, h) / 2 - 10;
    ctx.save(); ctx.translate(cx, cy); ctx.rotate(ang);
    for (var k = 0; k < n; k++) {
      var a0 = k * seg, a1 = a0 + seg;
      ctx.beginPath(); ctx.moveTo(0, 0);
      ctx.arc(0, 0, R, a0, a1); ctx.closePath();
      ctx.fillStyle = PAL[k % PAL.length]; ctx.fill();
      ctx.strokeStyle = 'rgba(23,20,26,.20)'; ctx.lineWidth = 1; ctx.stroke();
      // 이름 — 호 길이(반지름 × 중심각, 여유 .78)에 맞게 이분 탐색한 크기로 적는다
      var mid = (a0 + a1) / 2;
      var fs = fitFont(entries[k], R * seg * 0.78);
      ctx.save(); ctx.rotate(mid);
      ctx.fillStyle = INK;
      ctx.font = '700 ' + fs + 'px sans-serif';
      ctx.textAlign = 'right'; ctx.textBaseline = 'middle';
      ctx.fillText(entries[k], R - 12, 0);
      ctx.restore();
    }
    ctx.beginPath(); ctx.arc(0, 0, 12, 0, TAU);
    ctx.fillStyle = CREAM; ctx.fill(); ctx.strokeStyle = 'rgba(23,20,26,.35)'; ctx.stroke();
    if (pulse >= 0) {
      ctx.beginPath(); ctx.arc(0, 0, 12 + pulse * 18, 0, TAU);
      ctx.strokeStyle = 'rgba(23,20,26,' + (1 - pulse) * 0.5 + ')';
      ctx.lineWidth = 2; ctx.stroke();
    }
    ctx.restore();
    ctx.beginPath();
    ctx.moveTo(cx - 6, cy - R - 8); ctx.lineTo(cx + 6, cy - R - 8); ctx.lineTo(cx, cy - R + 7);
    ctx.closePath(); ctx.fillStyle = INK; ctx.fill();
  }

  // 입력칸 — 값이 바뀌면(change) 판이 같이 다시 그려진다
  function renderInputs() {
    inputsEl.textContent = '';
    for (var k = 0; k < entries.length; k++) {
      (function (idx) {
        var lab = document.createElement('label');
        lab.className = 'ed__lab';
        var inp = document.createElement('input');
        inp.type = 'text';
        inp.className = 'ed__inp';
        inp.value = entries[idx];
        inp.maxLength = 8;
        inp.setAttribute('aria-label', (idx + 1) + '번 항목 이름');
        inp.addEventListener('change', function () {
          entries[idx] = inp.value || '이름';
          idle = 1.2;
          draw();
        });
        lab.appendChild(inp);
        inputsEl.appendChild(lab);
      })(k);
    }
    cntEl.textContent = String(entries.length);
    btnEl.disabled = entries.length >= MAXN;
  }
  btnEl.addEventListener('click', function () {
    if (entries.length >= MAXN) return;
    entries.push('새 항목');
    renderInputs();
    idle = 1.2;
    draw();
  });

  var drag = { on: false, lastA: 0, lastT: 0, v: 0 };
  function angleAt(e) {
    var b = field.getBoundingClientRect();
    return Math.atan2(e.clientY - (b.top + b.height / 2), e.clientX - (b.left + b.width / 2));
  }
  field.addEventListener('pointerdown', function (e) {
    drag.on = true; drag.lastA = angleAt(e); drag.lastT = performance.now(); drag.v = 0;
    if (field.setPointerCapture) { try { field.setPointerCapture(e.pointerId); } catch (err) { /* 캡처 실패는 회전에 영향 없다 */ } }
  });
  field.addEventListener('pointermove', function (e) {
    if (!drag.on) return;
    var a = angleAt(e), now = performance.now();
    var dA = a - drag.lastA;
    if (dA > Math.PI) dA -= TAU;
    if (dA < -Math.PI) dA += TAU;
    ang += dA;
    var dt = Math.max(1, now - drag.lastT) / 1000;
    drag.v = 0.65 * drag.v + 0.35 * (dA / dt);
    drag.lastA = a; drag.lastT = now;
    idle = 0;
  });
  function endDrag() {
    if (!drag.on) return;
    drag.on = false;
    vel = Math.max(-20, Math.min(20, drag.v));
    settle = -1; pulse = -1;
  }
  field.addEventListener('pointerup', endDrag);
  field.addEventListener('pointercancel', endDrag);
  field.addEventListener('keydown', function (e) {
    if (e.key === ' ' || e.key === 'Enter') { e.preventDefault(); vel = flicks[fi++ % flicks.length]; settle = -1; pulse = -1; idle = 0; }
  });

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var last = performance.now();
  function step(now) {
    var dt = Math.min(64, now - last) / 1000; last = now;
    if (!drag.on) {
      if (vel !== 0) {
        ang += vel * dt;
        vel *= Math.pow(FRICTION, dt);
        if (Math.abs(vel) < STOP) { vel = 0; settle = 0; pulse = 0; }
      } else if (idle > 0) { idle -= dt; }
      else if (settle >= 0) {
        settle += dt; pulse = Math.min(1, settle / 0.3);
        if (settle > 0.34) { vel = flicks[fi++ % flicks.length]; settle = -1; pulse = -1; }
      }
    }
    draw();
    requestAnimationFrame(step);
  }

  fit();
  renderInputs();
  window.addEventListener('resize', fit);
  if (reduce) {
    // 정지 한 장 — 7칸까지 늘어난 상태로 고정하고 루프는 돌지 않는다
    entries = ['김하늘', '이준호', '박서연', '최도윤', '정민준', '한수아', '새 항목'];
    renderInputs();
    pulse = 0.4; settle = 0;
    draw();
    root.classList.add('is-still');
  } else {
    vel = flicks[0];
    requestAnimationFrame(step);
  }
})();

// SpinWheelEntryEditor — vanilla 판(run/332/demo/07-spin-wheel-entry-editor/index.html) 의 React 포트.
// 이름을 고치면 칸 수가 그대로 각도 분할에 반영되고, 각 칸 글자 크기는 fitFont() 가 호 길이에
// 맞게 measureText 이분 탐색(7회)으로 줄인다. "칸 추가"는 MAXN=7 까지만 늘린다.
// 움직임은 전부 캔버스 rAF 루프가 그리므로 CSS 애니메이션이 없다.
import { useEffect, useRef, useState } from "react";
import type { CSSProperties, PointerEvent, ChangeEvent } from "react";
import styles from "./SpinWheelEntryEditor.module.scss";

// demo.py 의 ambient react 스텁은 KeyboardEvent 를 export 하지 않는다 — 최소 자체 타입으로 대체
type KeyEvt = { key: string; preventDefault(): void };

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

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

const TAU = Math.PI * 2;
const MAXN = 7;
const FRICTION = 0.32, STOP = 0.5;
const FLICKS = [8, -10, 6.5];
const PAL = ["#b3bfd4", "#d9c48f", "#a9c4b0", "#c2a8d1", "#d8a3b4"];
const INK = "#17141a";
const CREAM = "#fff7e6";
const INIT_ENTRIES = ["김하늘", "이준호", "박서연", "최도윤"];
const REDUCE_ENTRIES = ["김하늘", "이준호", "박서연", "최도윤", "정민준", "한수아", "새 항목"];
const HINT = "이름을 고치면 칸 각도와 글자 크기가 함께 다시 계산됩니다 — measureText 이분 탐색";
const ARIA_FIELD = "항목 편집기 실험판";
const META_LABEL = "지금 ";
const META_UNIT = "칸";
const META_DRAG = "드래그로 돌리고 놓으면 돌아갑니다";
const ADD_LABEL = "칸 추가";

export default function SpinWheelEntryEditor({
  duration = "2s",
  easing = "ease-out",
  color = "#2f6df6"
}: SpinWheelEntryEditorProps) {
  const fieldRef = useRef<HTMLDivElement | null>(null);
  const cvRef = useRef<HTMLCanvasElement | null>(null);
  const ctxRef = useRef<CanvasRenderingContext2D | null>(null);
  const [entries, setEntries] = useState<string[]>(INIT_ENTRIES);
  const entriesRef = useRef(INIT_ENTRIES) as Box<string[]>;
  const stRef = useRef({
    ang: -0.4, vel: 0, settle: -1, pulse: -1, dpr: 1, fi: 1, idle: 0,
    drag: { on: false, lastA: 0, lastT: 0, v: 0 }
  }) as Box<{
    ang: number; vel: number; settle: number; pulse: number; dpr: number; fi: number; idle: number;
    drag: { on: boolean; lastA: number; lastT: number; v: number };
  }>;
  const lastRef = useRef(0) as Box<number>;
  const rafRef = useRef(0) as Box<number>;
  const [still, setStill] = useState(false);

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

  function fit(): void {
    const st = stRef.current;
    const field = fieldRef.current, cv = cvRef.current;
    if (!field || !cv) return;
    const ctx = cv.getContext("2d");
    if (!ctx) return;
    st.dpr = Math.min(2, window.devicePixelRatio || 1);
    cv.width = Math.round(field.clientWidth * st.dpr);
    cv.height = Math.round(field.clientHeight * st.dpr);
    ctxRef.current = ctx;
  }

  // 호 길이에 맞는 글자 크기 — 이분 탐색. measureText 로 폭을 재며 경계를 좁힌다
  function fitFont(ctx: CanvasRenderingContext2D, text: string, arcLen: number): number {
    let lo = 6, hi = 15, best = 6;
    for (let it = 0; it < 7; it++) {
      const mid = (lo + hi) / 2;
      ctx.font = "700 " + mid + "px sans-serif";
      if (ctx.measureText(text).width <= arcLen) { best = mid; lo = mid; } else { hi = mid; }
    }
    return best;
  }

  function draw(): void {
    const st = stRef.current;
    const ctx = ctxRef.current;
    if (!ctx) return;
    const list = entriesRef.current;
    const w = cvRef.current!.width / st.dpr, h = cvRef.current!.height / st.dpr;
    ctx.setTransform(st.dpr, 0, 0, st.dpr, 0, 0);
    ctx.clearRect(0, 0, w, h);
    const n = list.length, seg = TAU / n;
    const cx = w / 2, cy = h / 2, R = Math.min(w, h) / 2 - 10;
    ctx.save(); ctx.translate(cx, cy); ctx.rotate(st.ang);
    for (let k = 0; k < n; k++) {
      const a0 = k * seg, a1 = a0 + seg;
      ctx.beginPath(); ctx.moveTo(0, 0);
      ctx.arc(0, 0, R, a0, a1); ctx.closePath();
      ctx.fillStyle = PAL[k % PAL.length]; ctx.fill();
      ctx.strokeStyle = "rgba(23,20,26,.20)"; ctx.lineWidth = 1; ctx.stroke();
      const mid = (a0 + a1) / 2;
      const fs = fitFont(ctx, list[k], R * seg * 0.78);
      ctx.save(); ctx.rotate(mid);
      ctx.fillStyle = INK;
      ctx.font = "700 " + fs + "px sans-serif";
      ctx.textAlign = "right"; ctx.textBaseline = "middle";
      ctx.fillText(list[k], R - 12, 0);
      ctx.restore();
    }
    ctx.beginPath(); ctx.arc(0, 0, 12, 0, TAU);
    ctx.fillStyle = CREAM; ctx.fill(); ctx.strokeStyle = "rgba(23,20,26,.35)"; ctx.stroke();
    if (st.pulse >= 0) {
      ctx.beginPath(); ctx.arc(0, 0, 12 + st.pulse * 18, 0, TAU);
      ctx.strokeStyle = "rgba(23,20,26," + (1 - st.pulse) * 0.5 + ")";
      ctx.lineWidth = 2; ctx.stroke();
    }
    ctx.restore();
    ctx.beginPath();
    ctx.moveTo(cx - 6, cy - R - 8); ctx.lineTo(cx + 6, cy - R - 8); ctx.lineTo(cx, cy - R + 7);
    ctx.closePath(); ctx.fillStyle = INK; ctx.fill();
  }

  function onEntryChange(idx: number, e: ChangeEvent<HTMLInputElement>): void {
    const st = stRef.current;
    const list = entriesRef.current.slice();
    list[idx] = e.target.value || "이름";
    entriesRef.current = list;
    setEntries(list);
    st.idle = 1.2;
    draw();
  }
  function addEntry(): void {
    const st = stRef.current;
    if (entriesRef.current.length >= MAXN) return;
    const list = entriesRef.current.concat(["새 항목"]);
    entriesRef.current = list;
    setEntries(list);
    st.idle = 1.2;
    draw();
  }

  function angleAt(e: PointerEvent<HTMLDivElement>): number {
    const b = e.currentTarget.getBoundingClientRect();
    return Math.atan2(e.clientY - (b.top + b.height / 2), e.clientX - (b.left + b.width / 2));
  }
  function onPointerDown(e: PointerEvent<HTMLDivElement>): void {
    const st = stRef.current;
    st.drag.on = true; st.drag.lastA = angleAt(e); st.drag.lastT = performance.now(); st.drag.v = 0;
    try { e.currentTarget.setPointerCapture(e.pointerId); } catch { /* 캡처 실패는 회전에 영향 없다 */ }
  }
  function onPointerMove(e: PointerEvent<HTMLDivElement>): void {
    const st = stRef.current;
    if (!st.drag.on) return;
    const a = angleAt(e), now = performance.now();
    let dA = a - st.drag.lastA;
    if (dA > Math.PI) dA -= TAU;
    if (dA < -Math.PI) dA += TAU;
    st.ang += dA;
    const dt = Math.max(1, now - st.drag.lastT) / 1000;
    st.drag.v = 0.65 * st.drag.v + 0.35 * (dA / dt);
    st.drag.lastA = a; st.drag.lastT = now;
    st.idle = 0;
  }
  function endDrag(): void {
    const st = stRef.current;
    if (!st.drag.on) return;
    st.drag.on = false;
    st.vel = Math.max(-20, Math.min(20, st.drag.v));
    st.settle = -1; st.pulse = -1;
  }
  function onKeyDown(e: KeyEvt): void {
    const st = stRef.current;
    if (e.key === " " || e.key === "Enter") {
      e.preventDefault();
      st.vel = FLICKS[st.fi++ % FLICKS.length]; st.settle = -1; st.pulse = -1; st.idle = 0;
    }
  }

  function step(now: number): void {
    const st = stRef.current;
    const dt = Math.min(64, now - lastRef.current) / 1000; lastRef.current = now;
    if (!st.drag.on) {
      if (st.vel !== 0) {
        st.ang += st.vel * dt;
        st.vel *= Math.pow(FRICTION, dt);
        if (Math.abs(st.vel) < STOP) { st.vel = 0; st.settle = 0; st.pulse = 0; }
      } else if (st.idle > 0) { st.idle -= dt; }
      else if (st.settle >= 0) {
        st.settle += dt; st.pulse = Math.min(1, st.settle / 0.3);
        if (st.settle > 0.34) { st.vel = FLICKS[st.fi++ % FLICKS.length]; st.settle = -1; st.pulse = -1; }
      }
    }
    draw();
    rafRef.current = requestAnimationFrame(step);
  }

  useEffect(() => {
    fit();
    function onResize(): void { fit(); }
    window.addEventListener("resize", onResize);
    if (reduced()) {
      // 정지 한 장 — 7칸까지 늘어난 상태로 고정하고 루프는 돌지 않는다
      entriesRef.current = REDUCE_ENTRIES;
      setEntries(REDUCE_ENTRIES);
      const st = stRef.current;
      st.pulse = 0.4; st.settle = 0;
      draw();
      setStill(true);
    } else {
      stRef.current.vel = FLICKS[0];
      lastRef.current = performance.now();
      rafRef.current = requestAnimationFrame(step);
    }
    return () => {
      window.removeEventListener("resize", onResize);
      cancelAnimationFrame(rafRef.current);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const rootCls = still ? styles.ed + " " + styles.isStill : styles.ed;
  return (
    <main className={styles.stage}>
      <div className={rootCls} style={{ "--duration": duration, "--easing": easing, "--color": color } as Vars}>
        <p className={styles.hint}>{HINT}</p>
        <div className={styles.row}>
          <div
            className={styles.field}
            ref={fieldRef}
            role="application"
            aria-label={ARIA_FIELD}
            tabIndex={0}
            onKeyDown={onKeyDown}
            onPointerDown={onPointerDown}
            onPointerMove={onPointerMove}
            onPointerUp={endDrag}
            onPointerCancel={endDrag}
          >
            <canvas className={styles.cv} ref={cvRef}></canvas>
          </div>
          <div className={styles.side}>
            <div className={styles.inputs}>
              {entries.map((v, idx) => (
                <label key={idx} className={styles.lab}>
                  <input
                    type="text"
                    className={styles.inp}
                    defaultValue={v}
                    maxLength={8}
                    aria-label={String(idx + 1) + "번 항목 이름"}
                    onChange={(e: ChangeEvent<HTMLInputElement>) => onEntryChange(idx, e)}
                  />
                </label>
              ))}
            </div>
            <button type="button" className={styles.btn} disabled={entries.length >= MAXN} onClick={addEntry}>
              {ADD_LABEL}
            </button>
            <p className={styles.meta}>{META_LABEL}<b className={styles.count}>{entries.length}</b><span className={styles.metaUnit}>{META_UNIT}</span></p>
            <p className={styles.meta}>{META_DRAG}</p>
          </div>
        </div>
      </div>
    </main>
  );
}