/* widgets.js — retro-instrument widget library (GW namespace).
   Classic script: load after the token :root block (tokens.json → gen_tokens.py),
   before any GW.* call. Works from file:// — no modules, no build step.
   Contract: each gallery card in panel-widget-gallery.html is the visual +
   behavioral spec its builder is judged against.
   Spec: docs/specs/2026-07-12-component-generation-spec.org */
(function () {
'use strict';
const GW = {};

/* ================= shared engine ================= */

const SVGNS = 'http://www.w3.org/2000/svg';
function svgEl(parent, tag, attrs) {
  const e = document.createElementNS(SVGNS, tag);
  for (const k in attrs) e.setAttribute(k, attrs[k]);
  parent.appendChild(e); return e;
}
function polar(cx, cy, r, deg) {
  const a = deg * Math.PI / 180;
  return [cx + r * Math.sin(a), cy - r * Math.cos(a)];
}

/* ---- pointer-drag helpers (rect-ratio based, so CSS zoom is transparent) ---- */
function dragX(el, onPct) {
  el.style.touchAction = 'none';
  const at = e => { const r = el.getBoundingClientRect(); onPct(Math.max(0, Math.min(100, (e.clientX - r.left) / r.width * 100))); };
  el.addEventListener('pointerdown', e => {
    el.setPointerCapture(e.pointerId); at(e);
    const mv = ev => at(ev), up = () => { el.removeEventListener('pointermove', mv); el.removeEventListener('pointerup', up); el.removeEventListener('pointercancel', up); };
    el.addEventListener('pointermove', mv); el.addEventListener('pointerup', up); el.addEventListener('pointercancel', up); e.preventDefault();
  });
}
function dragY(el, onPct) {
  el.style.touchAction = 'none';
  const at = e => { const r = el.getBoundingClientRect(); onPct(Math.max(0, Math.min(100, (r.bottom - e.clientY) / r.height * 100))); };
  el.addEventListener('pointerdown', e => {
    el.setPointerCapture(e.pointerId); at(e);
    const mv = ev => at(ev), up = () => { el.removeEventListener('pointermove', mv); el.removeEventListener('pointerup', up); el.removeEventListener('pointercancel', up); };
    el.addEventListener('pointermove', mv); el.addEventListener('pointerup', up); el.addEventListener('pointercancel', up); e.preventDefault();
  });
}
function dragDelta(el, get, set, opts) {
  opts = opts || {}; el.style.touchAction = 'none';
  const min = opts.min == null ? 0 : opts.min, max = opts.max == null ? 100 : opts.max, sens = opts.sens || ((max - min) / 160);
  el.addEventListener('pointerdown', e => {
    if (opts.stop) e.stopPropagation(); el.setPointerCapture(e.pointerId);
    const y0 = e.clientY, v0 = get();
    const mv = ev => { let v = v0 + (y0 - ev.clientY) * sens; set(Math.max(min, Math.min(max, v))); };
    const up = () => { el.removeEventListener('pointermove', mv); el.removeEventListener('pointerup', up); el.removeEventListener('pointercancel', up); };
    el.addEventListener('pointermove', mv); el.addEventListener('pointerup', up); el.addEventListener('pointercancel', up); e.preventDefault();
  });
}

/* ---- seven-segment digit builder ---- */
const SEG = { '0': 'abcdef', '1': 'bc', '2': 'abged', '3': 'abgcd', '4': 'fbgc', '5': 'afgcd', '6': 'afgedc', '7': 'abc', '8': 'abcdefg', '9': 'abcdfg', '-': 'g', ' ': '' };
function hseg(cy) { return `5,${cy} 7,${cy - 2} 17,${cy - 2} 19,${cy} 17,${cy + 2} 7,${cy + 2}`; }
function vseg(cx, ty, by) { return `${cx},${ty} ${cx - 2},${ty + 2} ${cx - 2},${by - 2} ${cx},${by} ${cx + 2},${by - 2} ${cx + 2},${ty + 2}`; }
const SEGPTS = { a: hseg(3), g: hseg(22), d: hseg(41), f: vseg(5, 4, 21), b: vseg(19, 4, 21), e: vseg(5, 23, 40), c: vseg(19, 23, 40) };
function seg7(ch, cls) {
  const lit = SEG[ch] || ''; let s = `<svg class="seg7 ${cls || ''}" viewBox="0 0 24 44">`;
  for (const k of 'abcdefg') {
    const on = lit.includes(k);
    const col = on ? (cls === 'red' ? 'var(--sevred)' : 'var(--sevgrn)') : 'var(--sevoff)';
    s += `<polygon points="${SEGPTS[k]}" fill="${col}"/>`;
  }
  return s + '</svg>';
}

function buildBars(el, n) { el.innerHTML = ''; for (let k = 0; k < n; k++) el.appendChild(document.createElement('i')); }

/* ---- VU law: authentic nonlinear dB scale, dB → 0..1 sweep position ---- */
const VUDB = [[-20, 0], [-10, .20], [-7, .31], [-5, .40], [-3, .50], [-2, .58], [-1, .66], [0, .75], [1, .84], [2, .91], [3, 1]];
/* interpolate a dB reading from a 0..1 sweep position */
function vuDb(t) {
  let i = 0; while (i < VUDB.length - 2 && VUDB[i + 1][1] < t) i++;
  const [d1, t1] = VUDB[i], [d2, t2] = VUDB[i + 1];
  return d1 + (d2 - d1) * Math.max(0, Math.min(1, (t - t1) / (t2 - t1)));
}

/* ---- screen-color families: period phosphor/LCD palettes as scoped CSS vars.
   Shipped literals are the fallbacks, so defaults are pixel-identical until applied. ---- */
const SCREEN_FAMS = {
  green: { '--scr-hi': '#7fe0a0', '--scr-ink': '#58b87e', '--scr-dim': '#3d5c46',
    '--scr-bg1': '#0a120c', '--scr-bg2': '#050c07', '--scr-bgc': '#04140a', '--scr-bge': '#020a05', '--scr-brd': '#123018',
    '--scr-grat': 'rgba(111,206,51,.18)', '--scr-gratc': 'rgba(111,206,51,.35)', '--scr-glow': 'rgba(127,224,160,.8)',
    '--crt-face1': '#b9d8c0', '--crt-face2': '#8bb296', '--crt-glow': '#eef7ee' },
  amber: { '--scr-hi': '#ffbe54', '--scr-ink': '#e2a038', '--scr-dim': '#7d5c16',
    '--scr-bg1': '#140d06', '--scr-bg2': '#0a0705', '--scr-bgc': '#140d06', '--scr-bge': '#0a0603', '--scr-brd': '#33230e',
    '--scr-grat': 'rgba(226,160,56,.18)', '--scr-gratc': 'rgba(226,160,56,.35)', '--scr-glow': 'rgba(255,190,84,.8)',
    '--crt-face1': '#d8cba6', '--crt-face2': '#b3a276', '--crt-glow': '#ffe7c0' },
  red: { '--scr-hi': '#ff9a4c', '--scr-ink': '#e0742e', '--scr-dim': '#5c3416',
    '--scr-bg1': '#140a05', '--scr-bg2': '#0c0603', '--scr-bgc': '#140a05', '--scr-bge': '#0a0502', '--scr-brd': '#331c0c',
    '--scr-grat': 'rgba(224,116,46,.18)', '--scr-gratc': 'rgba(224,116,46,.35)', '--scr-glow': 'rgba(255,154,76,.8)',
    '--crt-face1': '#d8b9a6', '--crt-face2': '#b39276', '--crt-glow': '#ffdcc0' },
  blue: { '--scr-hi': '#cfe4ff', '--scr-ink': '#94b8d8', '--scr-dim': '#3a4c60',
    '--scr-bg1': '#0a0e14', '--scr-bg2': '#05080c', '--scr-bgc': '#0a1018', '--scr-bge': '#04070c', '--scr-brd': '#16283a',
    '--scr-grat': 'rgba(148,184,216,.18)', '--scr-gratc': 'rgba(148,184,216,.35)', '--scr-glow': 'rgba(207,228,255,.8)',
    '--crt-face1': '#c2d2dd', '--crt-face2': '#93a8b6', '--crt-glow': '#eaf2ff' },
  vfd: { '--scr-hi': '#63e6c8', '--scr-ink': '#46b89e', '--scr-dim': '#1e4a40',
    '--scr-bg1': '#06100d', '--scr-bg2': '#040b09', '--scr-bgc': '#041410', '--scr-bge': '#020a08', '--scr-brd': '#0e3028',
    '--scr-grat': 'rgba(70,184,158,.18)', '--scr-gratc': 'rgba(70,184,158,.35)', '--scr-glow': 'rgba(99,230,200,.8)',
    '--crt-face1': '#b0d8cd', '--crt-face2': '#84ada2', '--crt-glow': '#dcfff5' },
  white: { '--scr-hi': '#f2f4f2', '--scr-ink': '#c8cac8', '--scr-dim': '#5a5c5a',
    '--scr-bg1': '#0b0c0b', '--scr-bg2': '#070807', '--scr-bgc': '#0d0e0d', '--scr-bge': '#060706', '--scr-brd': '#2a2c2a',
    '--scr-grat': 'rgba(200,202,200,.18)', '--scr-gratc': 'rgba(200,202,200,.35)', '--scr-glow': 'rgba(242,244,242,.7)',
    '--crt-face1': '#d0d2d0', '--crt-face2': '#a8aaa8', '--crt-glow': '#f7f7f7' },
};

/* ================= widget builders =================
   Every builder: GW.name(host, opts) → handle. host is an empty element the
   widget renders into. opts.onChange(value, text) fires on every state change,
   including the initial paint; text is the widget's canonical readout string. */

const noop = () => {};

/* 01 slide toggle — on/off pill. State colors ride CSS vars (--sw-*). */
GW.slideToggle = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const sw = document.createElement('span'); sw.className = 'switch'; host.appendChild(sw);
  let on;
  const set = v => { on = !!v; sw.classList.toggle('on', on); onChange(on, on ? 'ON' : 'OFF'); };
  sw.addEventListener('click', () => set(!on));
  set(opts.on !== undefined ? opts.on : true);
  return { el: sw, get: () => on, set };
};

/* 02 console keys — mutually exclusive push buttons; {label, red} per key */
GW.consoleKeys = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const keys = opts.keys || [{ label: 'LIVE' }, { label: 'SCAN' }, { label: 'MUTED', red: true }];
  const wrap = document.createElement('span'); host.appendChild(wrap);
  const btns = keys.map(k => {
    const b = document.createElement('button'); b.className = 'key'; b.textContent = k.label;
    wrap.appendChild(b); return b;
  });
  let idx;
  const set = i => {
    idx = i;
    btns.forEach((b, j) => { b.classList.remove('on', 'red'); if (j === i) b.classList.add(keys[i].red ? 'red' : 'on'); });
    onChange(i, keys[i].label);
  };
  btns.forEach((b, i) => b.addEventListener('click', () => set(i)));
  set(opts.active || 0);
  return { el: wrap, get: () => idx, set };
};

/* 03 horizontal fader — continuous 0-100 */
GW.faderH = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const f = document.createElement('div'); f.className = 'fader';
  f.innerHTML = '<div class="slot"><div class="fill"></div></div><div class="cap"></div>';
  host.appendChild(f);
  let val;
  const set = p => {
    val = Math.max(0, Math.min(100, p));
    f.querySelector('.fill').style.width = val + '%';
    f.querySelector('.cap').style.left = val + '%';
    onChange(val, 'level ' + Math.round(val));
  };
  dragX(f, set);
  set(opts.value !== undefined ? opts.value : 68);
  return { el: f, get: () => val, set };
};

/* 04 vertical fader — one channel-strip fader; compose per channel */
GW.faderV = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const f = document.createElement('div'); f.className = 'vfader';
  f.innerHTML = '<div class="slot"><div class="fill"></div></div><div class="cap"></div>';
  host.appendChild(f);
  let val;
  const set = p => {
    val = Math.max(0, Math.min(100, p));
    f.querySelector('.fill').style.height = val + '%';
    f.querySelector('.cap').style.bottom = val + '%';
    onChange(val, 'level ' + Math.round(val));
  };
  dragY(f, set);
  set(opts.value !== undefined ? opts.value : 60);
  return { el: f, get: () => val, set };
};

/* 05 rotary knob — drag up/down to turn, -150°..+150° sweep */
GW.knob = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const min = opts.min !== undefined ? opts.min : 0, max = opts.max !== undefined ? opts.max : 100;
  const k = document.createElement('span'); k.className = 'knob';
  k.innerHTML = '<span class="ind"></span>';
  host.appendChild(k);
  let val;
  const set = v => {
    val = Math.max(min, Math.min(max, v));
    k.querySelector('.ind').style.transform = `rotate(${-150 + (val - min) / (max - min) * 300}deg)`;
    onChange(val, String(Math.round(val)));
  };
  dragDelta(k, () => val, set, { min, max });
  set(opts.value !== undefined ? opts.value : 53);
  return { el: k, get: () => val, set };
};

/* 06 segmented selector — pick one of a few */
GW.segmented = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const items = opts.items || ['TIMER', 'ALARM', 'POMO'];
  const seg = document.createElement('div'); seg.className = 'seg'; host.appendChild(seg);
  const btns = items.map(t => { const b = document.createElement('button'); b.textContent = t; seg.appendChild(b); return b; });
  let idx;
  const set = i => { idx = i; btns.forEach((b, j) => b.classList.toggle('on', j === i)); onChange(i, items[i]); };
  btns.forEach((b, i) => b.addEventListener('click', () => set(i)));
  set(opts.active || 0);
  return { el: seg, get: () => idx, set };
};

/* 07 chip toggle — inline binary inside a line of text */
GW.chipToggle = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const chip = document.createElement('span'); chip.className = 'chip';
  chip.textContent = opts.label || 'discoverable on';
  host.appendChild(chip);
  let on;
  const set = v => { on = !!v; chip.classList.toggle('on', on); onChange(on, on ? 'ON' : 'OFF'); };
  chip.addEventListener('click', () => set(!on));
  set(opts.on !== undefined ? opts.on : true);
  return { el: chip, get: () => on, set };
};

/* 08 arm-to-fire — two-stage confirm for destructive actions */
GW.armButton = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const label = opts.label || 'forget', armLabel = opts.armLabel || label + '? again';
  const a = document.createElement('button'); a.className = 'arm'; a.textContent = label;
  host.appendChild(a);
  let armed = false;
  a.addEventListener('click', () => {
    if (!armed) { armed = true; a.classList.add('armed'); a.textContent = armLabel; onChange('armed', 'ARMED'); }
    else { armed = false; a.classList.remove('armed'); a.textContent = label; onChange('fired', 'FIRED · reset'); }
  });
  onChange('safe', 'SAFE');
  return { el: a, get: () => (armed ? 'armed' : 'safe'), fire: () => a.click() };
};

/* 09 lamp row — actionable list item: lamp + name + status, click to cycle */
GW.lampRow = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const name = opts.name || 'WH-1000XM4';
  const states = opts.states || [['gold', 'tap to connect'], ['busy', 'connecting…'], ['', 'connected']];
  const row = document.createElement('div'); row.className = 'lrow';
  row.innerHTML = `<span class="lamp"></span><span class="who"><b></b></span><span class="what"></span>`;
  row.querySelector('b').textContent = name;
  host.appendChild(row);
  let idx;
  const set = i => {
    idx = i;
    row.querySelector('.lamp').className = 'lamp ' + states[i][0];
    row.querySelector('.what').textContent = states[i][1];
    onChange(i, states[i][1]);
  };
  row.addEventListener('click', () => set((idx + 1) % states.length));
  set(opts.state || 0);
  return { el: row, get: () => idx, set };
};

/* 24 rotary selector — pick one of five printed detents by position */
GW.rotarySelector = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const values = opts.values || [4, 6, 8, 10, 12];
  const fmt = opts.fmt || (v => 'size ' + v);
  const POS = [[14, 53], [28, 18], [50, 7], [72, 18], [86, 53]], ANG = [-70, -35, 0, 35, 70];
  const rs = document.createElement('span'); rs.className = 'rotsel';
  values.forEach((v, i) => {
    const p = document.createElement('span'); p.className = 'pos';
    p.style.left = POS[i][0] + '%'; p.style.top = POS[i][1] + '%'; p.textContent = v;
    rs.appendChild(p);
  });
  const k = document.createElement('span'); k.className = 'knob'; k.innerHTML = '<span class="ind"></span>'; rs.appendChild(k);
  host.appendChild(rs);
  let idx;
  const set = i => {
    idx = ((i % values.length) + values.length) % values.length;
    rs.querySelector('.ind').style.transform = `rotate(${ANG[idx]}deg)`;
    rs.querySelectorAll('.pos').forEach((p, j) => p.classList.toggle('on', j === idx));
    onChange(values[idx], fmt(values[idx]));
  };
  k.addEventListener('click', () => set(idx + 1));
  set(opts.index !== undefined ? opts.index : 2);
  return { el: rs, get: () => values[idx], set };
};

/* 25 slide-rule dial — lit pointer on a printed scale; click a mark or arrow-key */
GW.slideRule = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const values = opts.values || [4, 6, 8, 10, 12];
  const fmt = opts.fmt || (v => 'pos ' + v);
  const X = [12, 51, 90, 129, 168];
  const t = document.createElement('span'); t.className = 'tuner';
  t.tabIndex = 0; t.setAttribute('role', 'slider'); t.setAttribute('aria-label', 'slide-rule value');
  values.forEach((v, i) => {
    t.insertAdjacentHTML('beforeend', `<span class="tick" style="left:${X[i]}px"></span><span class="mk" style="left:${X[i]}px">${v}</span>`);
  });
  const ndl = document.createElement('span'); ndl.className = 'ndl'; t.appendChild(ndl);
  host.appendChild(t);
  let idx;
  const set = i => {
    idx = Math.max(0, Math.min(values.length - 1, i));
    ndl.style.left = X[idx] + 'px';
    t.querySelectorAll('.mk').forEach((m, j) => m.classList.toggle('on', j === idx));
    onChange(values[idx], fmt(values[idx]));
  };
  t.addEventListener('click', e => {
    const r = t.getBoundingClientRect(), x = e.clientX - r.left;
    let best = 0, bd = 1e9; X.slice(0, values.length).forEach((tx, j) => { const d = Math.abs(tx - x); if (d < bd) { bd = d; best = j; } });
    set(best); t.focus();
  });
  t.addEventListener('keydown', e => {
    if (e.key === 'ArrowLeft' || e.key === 'ArrowDown') { e.preventDefault(); set(idx - 1); }
    else if (e.key === 'ArrowRight' || e.key === 'ArrowUp') { e.preventDefault(); set(idx + 1); }
  });
  set(opts.index !== undefined ? opts.index : 2);
  return { el: t, get: () => values[idx], set };
};

/* N01 rocker power switch — hard on/off, lit legend */
GW.rocker = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const r = document.createElement('span'); r.className = 'rocker';
  r.innerHTML = `<span class="half top">${opts.onLabel || 'ON'}</span><span class="half bot">${opts.offLabel || 'OFF'}</span>`;
  host.appendChild(r);
  let on;
  const set = v => { on = !!v; r.classList.toggle('on', on); onChange(on, on ? 'ON' : 'OFF'); };
  r.addEventListener('click', () => set(!on));
  set(opts.on !== undefined ? opts.on : true);
  return { el: r, get: () => on, set };
};

/* N02 transport cluster — rew/play/stop/rec, one lit; reels turn while playing.
   opts.animate: reels obey play state (default: not prefers-reduced-motion) */
GW.transport = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const animate = opts.animate !== undefined ? opts.animate : !matchMedia('(prefers-reduced-motion: reduce)').matches;
  const MODES = { rew: '⏮', play: '▶', stop: '⏹', rec: '⏺' };
  const NAMES = { rew: 'REW', play: 'PLAY', stop: 'STOP', rec: 'REC' };
  const wrap = document.createElement('div');
  wrap.style.cssText = 'display:flex;flex-direction:column;gap:6px;align-items:center';
  wrap.innerHTML = `<div class="reels"><span class="reel spin"><i></i><i></i><i></i></span><span class="reel spin"><i></i><i></i><i></i></span></div><div class="transport"></div>`;
  const bar = wrap.querySelector('.transport');
  const btns = {};
  for (const m of Object.keys(MODES)) {
    const b = document.createElement('button'); b.className = 'tbtn' + (m === 'rec' ? ' rec' : '');
    b.textContent = MODES[m]; bar.appendChild(b); btns[m] = b;
    b.addEventListener('click', () => set(m));
  }
  host.appendChild(wrap);
  let mode;
  const set = m => {
    mode = m;
    for (const k in btns) btns[k].classList.toggle('on', k === m);
    wrap.querySelectorAll('.reel.spin').forEach(r => r.style.animationPlayState = (m === 'play' && animate) ? 'running' : 'paused');
    onChange(m, NAMES[m]);
  };
  /* initial: light the mode but leave reel play-state to CSS, matching load behavior */
  mode = opts.mode || 'play';
  btns[mode].classList.add('on');
  onChange(mode, NAMES[mode]);
  return { el: wrap, get: () => mode, set };
};

/* N03 radio preset bank — mechanically exclusive presets */
GW.presetBank = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const items = opts.items || ['WIFI', 'ETH', 'CELL', 'OFF'];
  const bank = document.createElement('div'); bank.className = 'radiobank'; host.appendChild(bank);
  const btns = items.map(t => { const b = document.createElement('button'); b.className = 'preset'; b.textContent = t; bank.appendChild(b); return b; });
  let idx;
  const set = i => { idx = i; btns.forEach((b, j) => b.classList.toggle('on', j === i)); onChange(i, items[i]); };
  btns.forEach((b, i) => b.addEventListener('click', () => set(i)));
  set(opts.active || 0);
  return { el: bank, get: () => idx, set };
};

/* N04 concentric dual knob — two values on one spindle, outer ring + inner cap */
GW.dualKnob = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const dk = document.createElement('span'); dk.className = 'dualknob';
  dk.innerHTML = `<span class="outer"><span class="tick" style="transform:rotate(-120deg)"></span><span class="tick" style="transform:rotate(120deg)"></span></span><span class="inner"><span class="ind"></span></span>`;
  host.appendChild(dk);
  const o = dk.querySelector('.outer'), n = dk.querySelector('.inner');
  let oV, iV;
  const paint = () => {
    o.style.transform = `rotate(${-150 + oV / 100 * 300}deg)`;
    n.style.transform = `rotate(${-150 + iV / 100 * 300}deg)`;
    onChange(oV, iV);
  };
  dragDelta(o, () => oV, v => { oV = v; paint(); }, { min: 0, max: 100 });
  dragDelta(n, () => iV, v => { iV = v; paint(); }, { min: 0, max: 100, stop: true });
  oV = opts.outer !== undefined ? opts.outer : 50;
  iV = opts.inner !== undefined ? opts.inner : 50;
  paint();
  return { el: dk, get: () => [oV, iV], set: (a, b) => { if (a !== undefined) oV = a; if (b !== undefined) iV = b; paint(); } };
};

/* N05 rotary encoder + LED ring — endless dial, lit arc tracks the level */
GW.encoder = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const enc = document.createElement('span'); enc.className = 'encoder'; host.appendChild(enc);
  const R = 27, cx = 33, cy = 33;
  for (let i = 0; i < 12; i++) {
    const a = (i * 30 - 90) * Math.PI / 180;
    const d = document.createElement('span'); d.className = 'led';
    d.style.left = (cx + R * Math.cos(a)) + 'px'; d.style.top = (cy + R * Math.sin(a)) + 'px';
    enc.appendChild(d);
  }
  const k = document.createElement('span'); k.className = 'knob'; k.innerHTML = '<span class="ind"></span>'; enc.appendChild(k);
  let val;
  const set = v => {
    val = v;
    const lit = ((Math.floor(val) % 12) + 12) % 12;
    enc.querySelectorAll('.led').forEach((l, i) => l.classList.toggle('on', i <= lit));
    k.style.transform = `rotate(${val * 30}deg)`;
    onChange(val, 'pos ' + Math.round(val));
  };
  dragDelta(enc, () => val, set, { min: 0, max: 100000, sens: 0.25 });
  set(opts.value !== undefined ? opts.value : 7);
  return { el: enc, get: () => val, set };
};

/* N06 keyed mode switch — guarded three-position mode, key-bit points at the live one */
GW.keySwitch = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const items = opts.items || ['OFF', 'ON', 'RUN'];
  const ANG = [-70, 0, 70], POS = [[16, 64], [50, 12], [84, 64]];
  const kl = document.createElement('span'); kl.className = 'keylock';
  items.forEach((t, i) => {
    const p = document.createElement('span'); p.className = 'kpos';
    p.style.left = POS[i][0] + '%'; p.style.top = POS[i][1] + '%'; p.textContent = t;
    kl.appendChild(p);
  });
  const body = document.createElement('span'); body.className = 'body';
  body.innerHTML = '<span class="bit"></span><span class="barrel"></span>';
  kl.appendChild(body); host.appendChild(kl);
  let idx;
  const set = i => {
    idx = ((i % items.length) + items.length) % items.length;
    body.querySelector('.bit').style.transform = `rotate(${ANG[idx]}deg)`;
    kl.querySelectorAll('.kpos').forEach((p, j) => p.classList.toggle('on', j === idx));
    onChange(idx, items[idx]);
  };
  body.addEventListener('click', () => set(idx + 1));
  set(opts.index !== undefined ? opts.index : 1);
  return { el: kl, get: () => idx, set };
};

/* N07 center-detented crossfader — throw to either side of zero */
GW.crossfader = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const xf = document.createElement('div'); xf.className = 'xfader';
  xf.innerHTML = `<div class="slot"></div><div class="detent"></div><span class="end" style="left:0">${opts.aLabel || 'A'}</span><span class="end" style="right:0">${opts.bLabel || 'B'}</span><div class="cap"></div>`;
  host.appendChild(xf);
  let pct;
  const set = p => {
    pct = Math.max(0, Math.min(100, p));
    xf.querySelector('.cap').style.left = pct + '%';
    const v = Math.round(pct - 50);
    onChange(v, (v > 0 ? '+' : '') + v);
  };
  dragX(xf, set);
  set(opts.value !== undefined ? opts.value : 50);
  return { el: xf, get: () => Math.round(pct - 50), set };
};

/* N08 thumbwheel — knurled edge-wheel with a windowed two-digit value */
GW.thumbwheel = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const w = document.createElement('div'); w.className = 'thumbw';
  w.innerHTML = '<span class="thumbwheel"></span><span class="win"></span>';
  host.appendChild(w);
  let val;
  const set = v => {
    val = Math.round(v);
    const s = ((val % 100) + 100) % 100;
    w.querySelector('.win').textContent = String(s).padStart(2, '0');
    onChange(s, 'value ' + s);
  };
  dragDelta(w.querySelector('.thumbwheel'), () => val, set, { min: 0, max: 99, sens: 0.2 });
  set(opts.value !== undefined ? opts.value : 42);
  return { el: w, get: () => ((val % 100) + 100) % 100, set };
};

/* N09 DIP-switch bank — hard flags, up is on; readout is the binary word */
GW.dipBank = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const bits = opts.bits || [true, false, true, true, false, false];
  const bank = document.createElement('span'); bank.className = 'dip'; host.appendChild(bank);
  const sws = bits.map(on => {
    const s = document.createElement('span'); s.className = 'dipsw' + (on ? ' on' : '');
    s.innerHTML = '<i></i>'; bank.appendChild(s); return s;
  });
  const word = () => sws.map(x => x.classList.contains('on') ? '1' : '0').join('');
  const upd = () => onChange(word(), word());
  sws.forEach(s => s.addEventListener('click', () => { s.classList.toggle('on'); upd(); }));
  upd();
  return { el: bank, get: word, set: w => { sws.forEach((s, i) => s.classList.toggle('on', w[i] === '1')); upd(); } };
};

/* N10 jog / shuttle wheel — scrub fine; position accumulates without limit */
GW.jogWheel = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const j = document.createElement('span'); j.className = 'jog';
  j.innerHTML = `<span class="shuttle" style="--sh:40deg"></span><span class="inner"><span class="dimple"></span></span>`;
  host.appendChild(j);
  let val;
  const set = v => {
    val = v;
    j.querySelector('.inner').style.transform = `rotate(${val * 4}deg)`;
    onChange(val, 'pos ' + Math.round(val));
  };
  dragDelta(j, () => val, set, { min: -100000, max: 100000, sens: 0.5 });
  set(opts.value !== undefined ? opts.value : 0);
  return { el: j, get: () => val, set };
};

/* ---- shared SVG defs: gradients/filters referenced by url(#id) are
   document-scoped, and several are used across widgets. Builders ensure the
   defs they use; the first caller creates it, later calls are no-ops. ---- */
let defsRoot = null;
const defsMade = new Set();
function defsHost() {
  if (!defsRoot) {
    const svg = document.createElementNS(SVGNS, 'svg');
    svg.setAttribute('width', 0); svg.setAttribute('height', 0);
    svg.setAttribute('aria-hidden', 'true');
    svg.style.position = 'absolute';
    defsRoot = document.createElementNS(SVGNS, 'defs');
    svg.appendChild(defsRoot);
    document.body.appendChild(svg);
  }
  return defsRoot;
}
function def(id, make) { if (defsMade.has(id)) return; defsMade.add(id); make(defsHost(), id); }
function gradDef(id, kind, attrs, stops) {
  def(id, d => {
    const g = svgEl(d, kind, Object.assign({ id }, attrs));
    for (const [offset, color] of stops) svgEl(g, 'stop', { offset, 'stop-color': color });
  });
}
function stageSvg(host, cls, vw, vh) {
  const s = document.createElementNS(SVGNS, 'svg');
  s.setAttribute('class', cls); s.setAttribute('viewBox', `0 0 ${vw} ${vh}`);
  s.setAttribute('width', vw); s.setAttribute('height', vh);
  host.appendChild(s); return s;
}

/* R02 calibrated vernier dial — the disc turns under a fixed hairline */
GW.vernierDial = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const s = stageSvg(host, 'rsvg drag', 150, 150), cx = 75, cy = 75;
  gradDef('vernFace', 'radialGradient', { cx: '50%', cy: '45%', r: '60%' }, [['0', '#f7f2da'], ['1', '#e4dfc2']]);
  gradDef('bakeKnob', 'radialGradient', { cx: '42%', cy: '36%', r: '75%' }, [['0', '#37332c'], ['1', '#060505']]);
  svgEl(s, 'circle', { cx, cy, r: 72, fill: '#0c0b0a', stroke: '#262320' });
  const disc = svgEl(s, 'g', {});
  svgEl(disc, 'circle', { cx, cy, r: 66, fill: 'url(#vernFace)', stroke: '#b7b29a', 'stroke-width': 1 });
  for (let u = 0; u <= 100; u++) {
    const a = u * 3, major = u % 10 === 0, half = u % 5 === 0;
    const len = major ? 10 : half ? 7 : 4.5, [x1, y1] = polar(cx, cy, 63, a), [x2, y2] = polar(cx, cy, 63 - len, a);
    svgEl(disc, 'line', { x1, y1, x2, y2, stroke: '#3a3128', 'stroke-width': major ? 1.3 : half ? 1 : .7 });
    if (major) {
      const g = svgEl(disc, 'g', { transform: `rotate(${a},${cx},${cy})` });
      svgEl(g, 'text', { x: cx, y: cy - 44, 'text-anchor': 'middle', 'font-size': 7.5, 'font-family': 'var(--mono)', fill: '#3a3128' }).textContent = u;
    }
  }
  for (let k = 0; k < 12; k++) { const [x, y] = polar(cx, cy, 24, k * 30); svgEl(s, 'circle', { cx: x, cy: y, r: 4.8, fill: 'url(#bakeKnob)' }); }
  svgEl(s, 'circle', { cx, cy, r: 24, fill: 'url(#bakeKnob)', stroke: '#000', 'stroke-width': .6 });
  svgEl(s, 'circle', { cx, cy, r: 16, fill: 'url(#bakeKnob)' });
  svgEl(s, 'ellipse', { cx: 69, cy: 66, rx: 7, ry: 4, fill: 'rgba(255,255,255,.10)', transform: 'rotate(-32,69,66)' });
  svgEl(s, 'line', { x1: cx, y1: 6, x2: cx, y2: 22, stroke: 'var(--fail)', 'stroke-width': 2.2, 'stroke-linecap': 'round' });
  let val;
  const set = v => { val = v; disc.setAttribute('transform', `rotate(${-v * 3},75,75)`); onChange(val, val.toFixed(1)); };
  dragDelta(s, () => val, set, { min: 0, max: 100, sens: 0.15 });
  set(opts.value !== undefined ? opts.value : 42.0);
  return { el: s, get: () => val, set };
};

/* R03 bat-handle toggle — chrome lever throws between lit legends */
GW.batToggle = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const s = stageSvg(host, 'rsvg press', 70, 90), cx = 35, cy = 44;
  gradDef('nutG', 'linearGradient', { x1: 0, y1: 0, x2: 0, y2: 1 }, [['0', '#8a8578'], ['1', '#4e4a42']]);
  gradDef('chromeG', 'linearGradient', { x1: 0, y1: 0, x2: 1, y2: 0 }, [['0', '#7e7a70'], ['.45', '#e8e5db'], ['1', '#8a867c']]);
  gradDef('tipG', 'radialGradient', { cx: '40%', cy: '32%', r: '75%' }, [['0', '#f2efe8'], ['1', '#7e7a70']]);
  const lblOn = svgEl(s, 'text', { x: cx, y: 9, 'text-anchor': 'middle', 'font-size': 7, 'letter-spacing': '.1em', 'font-family': 'var(--mono)', fill: 'var(--gold-hi)' });
  lblOn.textContent = opts.onLabel || 'ON';
  const lblOff = svgEl(s, 'text', { x: cx, y: 87, 'text-anchor': 'middle', 'font-size': 7, 'letter-spacing': '.1em', 'font-family': 'var(--mono)', fill: 'var(--dim)' });
  lblOff.textContent = opts.offLabel || 'OFF';
  const pts = []; for (let k = 0; k < 6; k++) { const a = (k * 60 + 30) * Math.PI / 180; pts.push((cx + 17 * Math.cos(a)) + ',' + (cy + 17 * Math.sin(a))); }
  svgEl(s, 'polygon', { points: pts.join(' '), fill: 'url(#nutG)', stroke: '#2b2822' });
  svgEl(s, 'circle', { cx, cy, r: 9, fill: '#14110e', stroke: '#000' });
  const lever = svgEl(s, 'g', {});
  svgEl(lever, 'path', { d: `M ${cx - 3.2} ${cy} L ${cx - 1.8} 21 L ${cx + 1.8} 21 L ${cx + 3.2} ${cy} Z`, fill: 'url(#chromeG)', stroke: '#4e4a42', 'stroke-width': .5 });
  svgEl(lever, 'ellipse', { cx, cy: 17, rx: 6.5, ry: 8, fill: 'url(#tipG)', stroke: '#5e5a52', 'stroke-width': .6 });
  lever.style.transformOrigin = `${cx}px ${cy}px`; lever.style.transition = 'transform .12s';
  let on;
  const set = v => {
    on = !!v;
    lever.style.transform = on ? 'rotate(0deg)' : 'rotate(180deg)';
    lblOn.setAttribute('fill', on ? 'var(--gold-hi)' : 'var(--dim)');
    lblOff.setAttribute('fill', on ? 'var(--dim)' : 'var(--gold-hi)');
    onChange(on, on ? 'ON' : 'OFF');
  };
  s.addEventListener('click', () => set(!on));
  set(opts.on !== undefined ? opts.on : true);
  return { el: s, get: () => on, set };
};

/* R04 bakelite fluted knob — scallop skirt over a printed 0-10 arc */
GW.flutedKnob = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const s = stageSvg(host, 'rsvg drag', 110, 110), cx = 55, cy = 54;
  gradDef('bakeSk', 'radialGradient', { cx: '42%', cy: '36%', r: '80%' }, [['0', '#312d27'], ['1', '#050404']]);
  gradDef('bakeDome', 'radialGradient', { cx: '40%', cy: '32%', r: '80%' }, [['0', '#3a362f'], ['1', '#0a0908']]);
  for (let i = 0; i <= 10; i++) {
    const a = -135 + i * 27, major = i % 5 === 0;
    const [x1, y1] = polar(cx, cy, 38, a), [x2, y2] = polar(cx, cy, major ? 45 : 43.5, a);
    svgEl(s, 'line', { x1, y1, x2, y2, stroke: 'var(--steel)', 'stroke-width': major ? 1.5 : 1 });
    if (major) {
      const [x, y] = polar(cx, cy, 50.5, a);
      svgEl(s, 'text', { x, y: y + 2.6, 'text-anchor': 'middle', 'font-size': 8, 'font-family': 'var(--mono)', fill: 'var(--steel)' }).textContent = i;
    }
  }
  for (let k = 0; k < 18; k++) { const [x, y] = polar(cx, cy, 31, k * 20); svgEl(s, 'circle', { cx: x, cy: y, r: 3.4, fill: 'url(#bakeSk)' }); }
  svgEl(s, 'circle', { cx, cy, r: 31, fill: 'url(#bakeSk)', stroke: '#000', 'stroke-width': .6 });
  const idx = svgEl(s, 'line', { x1: cx, y1: cy - 30, x2: cx, y2: cy - 21, stroke: 'var(--gold-hi)', 'stroke-width': 2.4, 'stroke-linecap': 'round' });
  svgEl(s, 'circle', { cx, cy, r: 19, fill: 'url(#bakeDome)' });
  svgEl(s, 'ellipse', { cx: 49, cy: 46, rx: 6, ry: 3.5, fill: 'rgba(255,255,255,.14)', transform: 'rotate(-28,49,46)' });
  let val;
  const set = v => { val = v; idx.setAttribute('transform', `rotate(${v * 2.7 - 135},55,54)`); onChange(val, (val / 10).toFixed(1) + ' / 10'); };
  dragDelta(s, () => val, set, { min: 0, max: 100, sens: 0.25 });
  set(opts.value !== undefined ? opts.value : 63);
  return { el: s, get: () => val, set };
};

/* R05 filter slider bank — one fader per band, teal arrow caps on black tracks */
GW.filterBank = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const freqs = opts.freqs || [78, 136, 235, 406, 701, 1210, 2090, 3620];
  const vals = (opts.values || [18, 30, 42, 25, 35, 55, 20, 48]).slice();
  const fmtHz = f => f < 1000 ? f : (f / 1000) + 'k';
  const s = stageSvg(host, 'rsvg', 190, 96);
  const y0 = 14, y1 = 84, x0 = 30, dx = 19.5;
  for (const [lbl, y] of [['0', y0], ['20', y0 + (y1 - y0) / 3], ['40', y0 + 2 * (y1 - y0) / 3], ['60', y1]])
    svgEl(s, 'text', { x: 14, y: y + 2, 'text-anchor': 'end', 'font-size': 6, 'font-family': 'var(--mono)', fill: 'var(--steel)' }).textContent = lbl;
  svgEl(s, 'text', { x: 14, y: 94, 'text-anchor': 'end', 'font-size': 5.5, 'font-family': 'var(--mono)', fill: 'var(--dim)' }).textContent = 'dB';
  const caps = [];
  const set = (i, db) => {
    db = Math.max(0, Math.min(60, db)); vals[i] = db;
    caps[i].setAttribute('transform', `translate(0,${14 + db / 60 * 70})`);
    onChange({ band: i, hz: freqs[i], db }, `${fmtHz(freqs[i])} Hz · −${Math.round(db)} dB`);
  };
  freqs.forEach((f, i) => {
    const x = x0 + i * dx;
    svgEl(s, 'text', { x, y: 8, 'text-anchor': 'middle', 'font-size': 5.2, 'font-family': 'var(--mono)', fill: 'var(--steel)' }).textContent = fmtHz(f);
    svgEl(s, 'line', { x1: x, y1: y0, x2: x, y2: y1, stroke: '#0a0908', 'stroke-width': 3.4, 'stroke-linecap': 'round' });
    svgEl(s, 'line', { x1: x - .7, y1: y0, x2: x - .7, y2: y1, stroke: 'rgba(255,255,255,.05)', 'stroke-width': .7 });
    const cap = svgEl(s, 'g', {});
    svgEl(cap, 'polygon', { points: `${x - 8.5},${-4.5} ${x - 2.5},0 ${x - 8.5},${4.5}`, fill: 'var(--vfd)', stroke: '#123028', 'stroke-width': .6 });
    svgEl(cap, 'polygon', { points: `${x + 8.5},${-4.5} ${x + 2.5},0 ${x + 8.5},${4.5}`, fill: 'var(--vfd)', stroke: '#123028', 'stroke-width': .6 });
    svgEl(cap, 'circle', { cx: x, cy: 0, r: 1.5, fill: '#123028' });
    caps.push(cap);
    /* paint the initial position without announcing it */
    cap.setAttribute('transform', `translate(0,${14 + vals[i] / 60 * 70})`);
    const hit = svgEl(s, 'rect', { x: x - 9.5, y: y0 - 6, width: 19, height: y1 - y0 + 12, fill: 'transparent' });
    hit.style.cursor = 'ns-resize';
    dragY(hit, pct => set(i, (100 - pct) / 100 * 60));
  });
  onChange(null, 'drag a band');
  return { el: s, get: () => vals.slice(), set };
};

/* R06 chicken-head selector — tapered lever aims at the position */
GW.chickenHead = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const items = opts.items || [['OFF', -60], ['LO', -20], ['MID', 20], ['HI', 60]];
  const s = stageSvg(host, 'rsvg press', 110, 96), cx = 55, cy = 58;
  gradDef('chickG', 'radialGradient', { cx: '42%', cy: '34%', r: '80%' }, [['0', '#35312b'], ['1', '#070606']]);
  const lbls = [];
  items.forEach(([lbl, a]) => {
    const [tx, ty] = polar(cx, cy, 42, a);
    const t = svgEl(s, 'text', { x: tx, y: ty + 2.5, 'text-anchor': 'middle', 'font-size': 6.5, 'letter-spacing': '.06em', 'font-family': 'var(--mono)', fill: 'var(--dim)' });
    t.textContent = lbl; lbls.push(t);
    const [mx1, my1] = polar(cx, cy, 33, a), [mx2, my2] = polar(cx, cy, 29, a);
    svgEl(s, 'line', { x1: mx1, y1: my1, x2: mx2, y2: my2, stroke: 'var(--steel)', 'stroke-width': 1.2 });
  });
  svgEl(s, 'circle', { cx, cy, r: 12, fill: '#0c0b0a' });
  const lever = svgEl(s, 'g', {});
  svgEl(lever, 'path', { d: `M ${cx} ${cy - 29} L ${cx + 8.5} ${cy - 4} Q ${cx + 9} ${cy + 8} ${cx + 5} ${cy + 11} A 7 7 0 0 1 ${cx - 5} ${cy + 11} Q ${cx - 9} ${cy + 8} ${cx - 8.5} ${cy - 4} Z`, fill: 'url(#chickG)', stroke: '#000', 'stroke-width': .7 });
  svgEl(lever, 'line', { x1: cx, y1: cy - 26, x2: cx, y2: cy + 6, stroke: '#4a463e', 'stroke-width': 1.4, 'stroke-linecap': 'round' });
  lever.style.transformOrigin = `${cx}px ${cy}px`; lever.style.transition = 'transform .12s';
  let idx;
  const set = i => {
    idx = ((i % items.length) + items.length) % items.length;
    lever.style.transform = `rotate(${items[idx][1]}deg)`;
    lbls.forEach((t, k) => t.setAttribute('fill', k === idx ? 'var(--gold-hi)' : 'var(--dim)'));
    onChange(idx, items[idx][0]);
  };
  s.addEventListener('click', () => set(idx + 1));
  set(opts.index !== undefined ? opts.index : 2);
  return { el: s, get: () => idx, set };
};

/* R12 chrome slot fader — engraved dB scale, chrome T-handle in a screwed plate */
GW.slotFader = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const s = stageSvg(host, 'rsvg drag', 90, 150), cx = 45, yTop = 30, yBot = 120;
  const yOf = db => yTop + (12 - db) / 36 * (yBot - yTop);
  gradDef('sfPlate', 'linearGradient', { x1: 0, y1: 0, x2: 1, y2: 1 }, [['0', '#242019'], ['1', '#131110']]);
  gradDef('sfChrome', 'linearGradient', { x1: 0, y1: 0, x2: 0, y2: 1 }, [['0', '#f0efec'], ['.45', '#c4c1b9'], ['1', '#75726a']]);
  gradDef('sfScrew', 'radialGradient', { cx: '40%', cy: '35%', r: '75%' }, [['0', '#9b968a'], ['1', '#4a463e']]);
  svgEl(s, 'rect', { x: 14, y: 8, width: 62, height: 134, rx: 6, fill: 'url(#sfPlate)', stroke: '#0a0908', 'stroke-width': 1.5 });
  svgEl(s, 'rect', { x: 15.5, y: 9.5, width: 59, height: 131, rx: 5, fill: 'none', stroke: 'rgba(255,255,255,.05)', 'stroke-width': 1 });
  for (const sy of [16, 134]) {
    svgEl(s, 'circle', { cx, cy: sy, r: 3.2, fill: 'url(#sfScrew)', stroke: '#14110e', 'stroke-width': .6 });
    const [x1, y1] = polar(cx, sy, 3, 112), [x2, y2] = polar(cx, sy, 3, 292);
    svgEl(s, 'line', { x1, y1, x2, y2, stroke: '#221f1a', 'stroke-width': 1 });
  }
  svgEl(s, 'rect', { x: 40.5, y: yTop - 4, width: 9, height: yBot - yTop + 8, rx: 4, fill: '#0b0a09', stroke: '#050404' });
  for (const db of [12, 8, 4, 0, -4, -8, -12, -16, -20, -24]) {
    const y = yOf(db);
    svgEl(s, 'line', { x1: 26, y1: y, x2: 39, y2: y, stroke: 'var(--steel)', 'stroke-width': db === 0 ? 1.3 : .8, opacity: db === 0 ? 1 : .75 });
    svgEl(s, 'line', { x1: 51, y1: y, x2: 64, y2: y, stroke: 'var(--steel)', 'stroke-width': db === 0 ? 1.3 : .8, opacity: db === 0 ? 1 : .75 });
    svgEl(s, 'text', { x: 23, y: y + 2.2, 'text-anchor': 'end', 'font-size': 6, 'font-family': 'var(--mono)', fill: db === 0 ? 'var(--cream)' : 'var(--steel)' }).textContent = Math.abs(db);
  }
  const handle = svgEl(s, 'g', {});
  svgEl(handle, 'polygon', { points: '45,0 58,-5 58,5', fill: '#b9b6ae', stroke: '#5e5a52', 'stroke-width': .5 });
  svgEl(handle, 'rect', { x: 58, y: -7, width: 22, height: 14, rx: 3.5, fill: 'url(#sfChrome)', stroke: '#4e4a42', 'stroke-width': .6 });
  svgEl(handle, 'rect', { x: 60, y: -5.2, width: 18, height: 2.2, rx: 1, fill: 'rgba(255,255,255,.4)' });
  let db;
  const set = v => {
    db = Math.max(-24, Math.min(12, v));
    handle.setAttribute('transform', `translate(0,${30 + (12 - db) / 36 * 90})`);
    onChange(db, (db > 0 ? '+' : db < 0 ? '−' : '') + Math.abs(db).toFixed(1) + ' dB');
  };
  dragY(s, pct => set(-24 + pct / 100 * 36));
  set(opts.value !== undefined ? opts.value : -4);
  return { el: s, get: () => db, set };
};

/* R14 spade-pointer tuning knob — engraved relief arc, knurl ring turns with it */
GW.spadeKnob = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const s = stageSvg(host, 'rsvg drag', 140, 124), cx = 70, cy = 82;
  const sweep = v => -80 + v / 10 * 160;
  gradDef('spadeKnob', 'radialGradient', { cx: '42%', cy: '34%', r: '80%' }, [['0', '#33302a'], ['1', '#080706']]);
  gradDef('spadeMetal', 'linearGradient', { x1: 0, y1: 0, x2: 1, y2: 1 }, [['0', '#e9e7e0'], ['1', '#8d897f']]);
  /* engraved arc: every stroke carries a faint light twin offset below (incised relief) */
  const engrave = (x1, y1, x2, y2, w) => {
    svgEl(s, 'line', { x1, y1: y1 + .8, x2, y2: y2 + .8, stroke: 'rgba(255,255,255,.13)', 'stroke-width': w });
    svgEl(s, 'line', { x1, y1, x2, y2, stroke: '#050404', 'stroke-width': w });
  };
  for (let i = 0; i <= 40; i++) {
    const v = i / 4, a = sweep(v), major = i % 4 === 0;
    const [x1, y1] = polar(cx, cy, major ? 50 : 52, a), [x2, y2] = polar(cx, cy, 58, a);
    engrave(x1, y1, x2, y2, major ? 1.6 : .9);
    if (major) {
      const [nx, ny] = polar(cx, cy, 65, a);
      svgEl(s, 'text', { x: nx, y: ny + 3.2, 'text-anchor': 'middle', 'font-size': 7.5, 'font-family': 'var(--mono)', fill: 'rgba(255,255,255,.13)' }).textContent = v;
      svgEl(s, 'text', { x: nx, y: ny + 2.4, 'text-anchor': 'middle', 'font-size': 7.5, 'font-family': 'var(--mono)', fill: '#0a0908' }).textContent = v;
    }
  }
  const grp = svgEl(s, 'g', {});
  svgEl(grp, 'path', { d: `M ${cx - 2} ${cy - 28} L ${cx - 4.5} ${cy - 42} L ${cx} ${cy - 54} L ${cx + 4.5} ${cy - 42} L ${cx + 2} ${cy - 28} Z`, fill: 'url(#spadeMetal)', stroke: '#55524a', 'stroke-width': .6 });
  svgEl(grp, 'circle', { cx, cy, r: 30, fill: 'url(#spadeKnob)', stroke: '#000', 'stroke-width': .8 });
  svgEl(grp, 'circle', { cx, cy, r: 28.5, fill: 'none', stroke: '#0a0908', 'stroke-width': 3, 'stroke-dasharray': '2.2 2.2' });
  svgEl(grp, 'circle', { cx, cy, r: 22, fill: 'url(#spadeKnob)' });
  svgEl(grp, 'ellipse', { cx: cx - 8, cy: cy - 9, rx: 8, ry: 5, fill: 'rgba(255,255,255,.08)', transform: `rotate(-30,${cx - 8},${cy - 9})` });
  let val;
  const set = v => {
    val = Math.max(0, Math.min(10, v));
    grp.setAttribute('transform', `rotate(${-80 + val / 10 * 160},70,82)`);
    onChange(val, val.toFixed(1));
  };
  dragDelta(s, () => val, set, { min: 0, max: 10, sens: .05 });
  set(opts.value !== undefined ? opts.value : 8.3);
  return { el: s, get: () => val, set };
};

/* R15 multi-band dial — nested arcs, one needle; the bandspread dial selects the ring */
GW.multiBandDial = function (host, opts = {}) {
  const onChange = opts.onChange || noop;
  const ranges = opts.ranges || [[0.54, 1.6], [1.6, 5.1], [5.1, 15.5], [15.5, 30.5]];
  const s = stageSvg(host, 'rsvg', 190, 110), cx = 62, cy = 62;
  const sweep = t => -70 + t * 140;
  gradDef('mbFace', 'linearGradient', { x1: 0, y1: 0, x2: 1, y2: 1 }, [['0', '#eee5c8'], ['1', '#dcd2ae']]);
  gradDef('spadeKnob', 'radialGradient', { cx: '42%', cy: '34%', r: '80%' }, [['0', '#33302a'], ['1', '#080706']]);
  svgEl(s, 'rect', { x: 4, y: 4, width: 182, height: 102, rx: 12, fill: '#171412', stroke: '#060505' });
  svgEl(s, 'rect', { x: 9, y: 9, width: 172, height: 92, rx: 9, fill: 'url(#mbFace)', stroke: '#0a0908' });
  const INK = '#2c2318';
  const rings = [];
  [18, 26, 34, 42].forEach(r => {
    const ring = svgEl(s, 'g', {});
    const [x1, y1] = polar(cx, cy, r, -70), [x2, y2] = polar(cx, cy, r, 70);
    svgEl(ring, 'path', { d: `M ${x1} ${y1} A ${r} ${r} 0 0 1 ${x2} ${y2}`, fill: 'none', stroke: INK, 'stroke-width': .9 });
    for (let i = 0; i <= 8; i++) {
      const a = sweep(i / 8), [tx1, ty1] = polar(cx, cy, r, a), [tx2, ty2] = polar(cx, cy, r + 3, a);
      svgEl(ring, 'line', { x1: tx1, y1: ty1, x2: tx2, y2: ty2, stroke: INK, 'stroke-width': .8 });
    }
    rings.push(ring);
  });
  const needle = svgEl(s, 'line', { x1: cx, y1: cy, x2: cx, y2: cy - 46, stroke: '#1a1613', 'stroke-width': 1.6, 'stroke-linecap': 'round' });
  svgEl(s, 'circle', { cx, cy, r: 7, fill: 'url(#spadeKnob)', stroke: '#000', 'stroke-width': .6 });
  svgEl(s, 'text', { x: 14, y: 100, 'font-size': 5, 'letter-spacing': '.12em', 'font-family': 'var(--mono)', fill: INK, opacity: .8 }).textContent = 'MEGACYCLES';
  /* bandspread dial (click = band select) */
  const bx = 142, by = 56;
  for (let i = 0; i < 12; i++) { const a = i * 30, [x1, y1] = polar(bx, by, 24, a), [x2, y2] = polar(bx, by, 21, a); svgEl(s, 'line', { x1, y1, x2, y2, stroke: INK, 'stroke-width': .8 }); }
  svgEl(s, 'circle', { cx: bx, cy: by, r: 17, fill: 'none', stroke: INK, 'stroke-width': .7, opacity: .5 });
  const spread = svgEl(s, 'line', { x1: bx, y1: by, x2: bx, y2: by - 22, stroke: '#1a1613', 'stroke-width': 1.4, 'stroke-linecap': 'round' });
  svgEl(s, 'circle', { cx: bx, cy: by, r: 6, fill: 'url(#spadeKnob)', stroke: '#000', 'stroke-width': .6 });
  svgEl(s, 'text', { x: bx, y: 96, 'text-anchor': 'middle', 'font-size': 5, 'letter-spacing': '.12em', 'font-family': 'var(--mono)', fill: INK, opacity: .8 }).textContent = 'BANDSPREAD';
  let val, band;
  const set = (v, b) => {
    val = Math.max(0, Math.min(100, v)); band = b;
    needle.setAttribute('transform', `rotate(${-70 + val / 100 * 140},62,62)`);
    spread.setAttribute('transform', `rotate(${-45 + b * 30},142,56)`);
    rings.forEach((g, i) => g.setAttribute('opacity', i === b ? '1' : '.4'));
    const [lo, hi] = ranges[b]; const mc = lo + val / 100 * (hi - lo);
    onChange({ band: b, mc }, `B${b + 1} · ${mc.toFixed(2)} Mc`);
  };
  const dragHit = svgEl(s, 'rect', { x: 9, y: 9, width: 100, height: 92, fill: 'transparent' });
  dragHit.style.cursor = 'ns-resize';
  dragDelta(dragHit, () => val, v => set(v, band), { min: 0, max: 100 });
  const clickHit = svgEl(s, 'rect', { x: 112, y: 9, width: 69, height: 92, fill: 'transparent' });
  clickHit.style.cursor = 'pointer';
  clickHit.addEventListener('click', () => set(val, (band + 1) % ranges.length));
  set(opts.value !== undefined ? opts.value : 45, opts.band !== undefined ? opts.band : 2);
  return { el: s, get: () => [val, band], set };
};

/* ---- widget CSS: injected once, grows as builders move in ---- */
const GW_CSS = ``;
function ensureCss() {
  if (document.getElementById('gw-css') || !GW_CSS) return;
  const st = document.createElement('style'); st.id = 'gw-css'; st.textContent = GW_CSS;
  document.head.appendChild(st);
}
if (document.head) ensureCss();
else document.addEventListener('DOMContentLoaded', ensureCss);

Object.assign(GW, { SVGNS, svgEl, polar, dragX, dragY, dragDelta, SEG, seg7, buildBars, VUDB, vuDb, SCREEN_FAMS });
window.GW = GW;
})();