1const IS_BROWSER = typeof window !== 'undefined';
2 
3// ─── Section 7: Browser UI (IS_BROWSER only) ────────────────────────────────
4 
5if (IS_BROWSER) {
6  // Detect extension mode via the script tag's data attribute or the document element fallback.
7  // currentScript is reliable for synchronously-executing scripts (which our IIFE is).
8  const _myScript = document.currentScript;
9  const EXTENSION_MODE = (_myScript && _myScript.dataset.impeccableExtension === 'true')
10    || document.documentElement.dataset.impeccableExtension === 'true';
11 
12  // Kinpaku gold — pinned to the site's brand token (see
13  // site/styles/kinpaku-tokens.css --ks-kinpaku). Keep this in sync with
14  // the picker's C.brand in skill/scripts/live-browser.js and the kit's
15  // picker section in site/styles/kinpaku-kit.css.
16  //
17  // One color across both light and dark host pages. The outline is a
18  // 2px gesture pointing at an element + a labeled tag — it's a marker,
19  // not body text, so it doesn't need WCAG AA against the page. The
20  // label text inside the gold tag is dark (LABEL_INK) which has ~16:1
21  // against the leaf gold, so reading the rule name is solid in both
22  // modes. Hover deepens the gold (preserves chroma — never drops it,
23  // dropping chroma washes the gold into a sand/olive tone).
24  const BRAND_COLOR = 'oklch(84% 0.19 80.46)';
25  const BRAND_COLOR_HOVER = 'oklch(74% 0.18 80)';
26  const LABEL_INK = 'oklch(4% 0.004 95)';
27  const LABEL_BG = BRAND_COLOR;
28  const OUTLINE_COLOR = BRAND_COLOR;
29 
30  // Inject hover styles via CSS (more reliable than JS event listeners)
31  const styleEl = document.createElement('style');
32  styleEl.textContent = `
33    @keyframes impeccable-reveal {
34      from { opacity: 0; }
35      to { opacity: 1; }
36    }
37    .impeccable-overlay:not(.impeccable-banner) {
38      pointer-events: none;
39      outline: 2px solid ${OUTLINE_COLOR};
40      border-radius: 4px;
41      transition: outline-color 0.15s ease;
42      animation: impeccable-reveal 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
43      animation-play-state: paused;
44      border-top-left-radius: 0;
45    }
46    .impeccable-overlay.impeccable-visible {
47      animation-play-state: running;
48    }
49    .impeccable-overlay.impeccable-hover {
50      outline-color: ${BRAND_COLOR_HOVER};
51      z-index: 100001 !important;
52    }
53    .impeccable-overlay.impeccable-hover .impeccable-label {
54      background: ${BRAND_COLOR_HOVER};
55    }
56    .impeccable-overlay.impeccable-spotlight {
57      z-index: 100002 !important;
58    }
59    .impeccable-overlay.impeccable-spotlight-dimmed {
60      opacity: 0.15 !important;
61      animation: none !important;
62      filter: blur(3px);
63    }
64    .impeccable-spotlight-backdrop {
65      position: fixed;
66      top: 0; left: 0; right: 0; bottom: 0;
67      backdrop-filter: blur(3px) brightness(0.6);
68      -webkit-backdrop-filter: blur(3px) brightness(0.6);
69      pointer-events: none;
70      z-index: 99998;
71      opacity: 0;
72      outline: none !important;
73      animation: none !important;
74    }
75    .impeccable-spotlight-backdrop.impeccable-visible {
76      opacity: 1;
77    }
78    .impeccable-hidden .impeccable-overlay${EXTENSION_MODE ? '' : ':not(.impeccable-banner)'} {
79      display: none !important;
80    }
81  `;
82  (document.head || document.documentElement).appendChild(styleEl);
83 
84  // Spotlight backdrop element (created lazily on first use)
85  let spotlightBackdrop = null;
86  let spotlightTarget = null;
87 
88  function getSpotlightBackdrop() {
89    if (!spotlightBackdrop) {
90      spotlightBackdrop = document.createElement('div');
91      spotlightBackdrop.className = 'impeccable-spotlight-backdrop';
92      document.body.appendChild(spotlightBackdrop);
93    }
94    return spotlightBackdrop;
95  }
96 
97  function updateSpotlightClipPath() {
98    if (!spotlightBackdrop || !spotlightTarget) return;
99    const r = spotlightTarget.getBoundingClientRect();
100    // Match the overlay's outer edge: element rect + 4px (2px overlay offset + 2px outline width)
101    const inset = 4;
102    const radius = 6; // outline border-radius (4) + outline width (2)
103    const x1 = r.left - inset;
104    const y1 = r.top - inset;
105    const x2 = r.right + inset;
106    const y2 = r.bottom + inset;
107    const vw = window.innerWidth;
108    const vh = window.innerHeight;
109    // Outer rect + rounded inner rect (evenodd creates a hole)
110    const path = `M0 0H${vw}V${vh}H0Z M${x1 + radius} ${y1}H${x2 - radius}A${radius} ${radius} 0 0 1 ${x2} ${y1 + radius}V${y2 - radius}A${radius} ${radius} 0 0 1 ${x2 - radius} ${y2}H${x1 + radius}A${radius} ${radius} 0 0 1 ${x1} ${y2 - radius}V${y1 + radius}A${radius} ${radius} 0 0 1 ${x1 + radius} ${y1}Z`;
111    spotlightBackdrop.style.clipPath = `path(evenodd, "${path}")`;
112  }
113 
114  function showSpotlight(target) {
115    if (!target || !target.getBoundingClientRect) return;
116    // Respect the spotlightBlur setting: if disabled, don't show the backdrop
117    if (window.__IMPECCABLE_CONFIG__?.spotlightBlur === false) {
118      spotlightTarget = target;
119      return;
120    }
121    spotlightTarget = target;
122    const bd = getSpotlightBackdrop();
123    updateSpotlightClipPath();
124    bd.classList.add('impeccable-visible');
125  }
126 
127  function hideSpotlight() {
128    spotlightTarget = null;
129    if (spotlightBackdrop) spotlightBackdrop.classList.remove('impeccable-visible');
130  }
131 
132  function isInViewport(el) {
133    const r = el.getBoundingClientRect();
134    return r.top >= 0 && r.left >= 0 && r.bottom <= window.innerHeight && r.right <= window.innerWidth;
135  }
136 
137  // Reposition spotlight on scroll/resize
138  window.addEventListener('scroll', () => {
139    if (spotlightTarget) updateSpotlightClipPath();
140  }, { passive: true });
141  window.addEventListener('resize', () => {
142    if (spotlightTarget) updateSpotlightClipPath();
143  });
144 
145  const overlays = [];
146  const TYPE_LABELS = {};
147  const RULE_CATEGORY = {};
148  for (const ap of ANTIPATTERNS) {
149    TYPE_LABELS[ap.id] = ap.name.toLowerCase();
150    RULE_CATEGORY[ap.id] = ap.category || 'quality';
151  }
152 
153  function isInFixedContext(el) {
154    let p = el;
155    while (p && p !== document.body) {
156      if (getComputedStyle(p).position === 'fixed') return true;
157      p = p.parentElement;
158    }
159    return false;
160  }
161 
162  function positionOverlay(overlay) {
163    const el = overlay._targetEl;
164    if (!el) return;
165    const rect = el.getBoundingClientRect();
166    if (overlay._isFixed) {
167      // Viewport-relative coords for fixed targets
168      overlay.style.top = `${rect.top - 2}px`;
169      overlay.style.left = `${rect.left - 2}px`;
170    } else {
171      // Document-relative coords for normal targets
172      overlay.style.top = `${rect.top + scrollY - 2}px`;
173      overlay.style.left = `${rect.left + scrollX - 2}px`;
174    }
175    overlay.style.width = `${rect.width + 4}px`;
176    overlay.style.height = `${rect.height + 4}px`;
177  }
178 
179  function repositionOverlays() {
180    for (const o of overlays) {
181      if (!o._targetEl || o.classList.contains('impeccable-banner')) continue;
182      // Skip overlays whose target is currently hidden (display: none on the overlay)
183      if (o.style.display === 'none') continue;
184      positionOverlay(o);
185    }
186  }
187 
188  let resizeRAF;
189  const onResize = () => {
190    cancelAnimationFrame(resizeRAF);
191    resizeRAF = requestAnimationFrame(repositionOverlays);
192  };
193  window.addEventListener('resize', onResize);
194  // Reposition on scroll too -- catches sticky/parallax shifts
195  window.addEventListener('scroll', onResize, { passive: true });
196  // Reposition when body resizes (lazy-loaded images, dynamic content, fonts loading)
197  if (typeof ResizeObserver !== 'undefined') {
198    const bodyResizeObserver = new ResizeObserver(onResize);
199    bodyResizeObserver.observe(document.body);
200  }
201 
202  // Track target element visibility via IntersectionObserver.
203  // Uses a huge rootMargin so all *rendered* elements count as intersecting,
204  // while display:none / closed <details> / hidden modals etc. do not.
205  // This is event-driven -- no polling needed.
206  let overlayIndex = 0;
207  const visibilityObserver = new IntersectionObserver((entries) => {
208    for (const entry of entries) {
209      const overlay = entry.target._impeccableOverlay;
210      if (!overlay) continue;
211      if (entry.isIntersecting) {
212        overlay.style.display = '';
213        positionOverlay(overlay);
214        if (!overlay._revealed) {
215          overlay._revealed = true;
216          if (firstScanDone) {
217            // Subsequent reveals (re-scans, scroll-into-view): instant, no animation
218            overlay.style.animation = 'none';
219          } else {
220            // Initial scan: staggered cascade reveal
221            overlay.style.animationDelay = `${Math.min((overlay._staggerIndex || 0) * 60, 600)}ms`;
222          }
223          requestAnimationFrame(() => {
224            overlay.classList.add('impeccable-visible');
225            if (overlay._checkLabel) overlay._checkLabel();
226          });
227        }
228      } else {
229        overlay.style.display = 'none';
230      }
231    }
232  }, { rootMargin: '99999px' });
233 
234  function detachOverlay(overlay) {
235    if (!overlay) return;
236    if (typeof overlay._cleanup === 'function') {
237      try { overlay._cleanup(); } catch { /* best effort overlay teardown */ }
238    }
239    if (overlay._targetEl && overlay._targetEl._impeccableOverlay === overlay) {
240      visibilityObserver.unobserve(overlay._targetEl);
241      delete overlay._targetEl._impeccableOverlay;
242    }
243    const idx = overlays.indexOf(overlay);
244    if (idx >= 0) overlays.splice(idx, 1);
245    overlay.remove();
246  }
247 
248  // Reposition overlays after CSS transitions end (e.g. reveal animations).
249  // Listens at document level so it catches transitions on ancestor elements
250  // (the transform may be on a parent, not the flagged element itself).
251  document.addEventListener('transitionend', (e) => {
252    if (e.propertyName !== 'transform') return;
253    for (const o of overlays) {
254      if (!o._targetEl || o.classList.contains('impeccable-banner') || o.style.display === 'none') continue;
255      if (e.target === o._targetEl || e.target.contains(o._targetEl)) {
256        positionOverlay(o);
257      }
258    }
259  });
260 
261  const highlight = function(el, findings) {
262    if (el._impeccableOverlay) detachOverlay(el._impeccableOverlay);
263    const hasSlop = findings.some(f => RULE_CATEGORY[f.type || f.id] === 'slop');
264 
265    const fixed = isInFixedContext(el);
266    const rect = el.getBoundingClientRect();
267    const outline = document.createElement('div');
268    outline.className = 'impeccable-overlay';
269    outline._targetEl = el;
270    outline._isFixed = fixed;
271    Object.assign(outline.style, {
272      position: fixed ? 'fixed' : 'absolute',
273      top: fixed ? `${rect.top - 2}px` : `${rect.top + scrollY - 2}px`,
274      left: fixed ? `${rect.left - 2}px` : `${rect.left + scrollX - 2}px`,
275      width: `${rect.width + 4}px`, height: `${rect.height + 4}px`,
276      zIndex: '99999', boxSizing: 'border-box',
277    });
278 
279    // Build per-finding label entries: ✦ prefix for slop
280    const entries = findings.map(f => {
281      const name = TYPE_LABELS[f.type || f.id] || f.type || f.id;
282      const prefix = RULE_CATEGORY[f.type || f.id] === 'slop' ? '\u2726 ' : '';
283      return { name: prefix + name, detail: f.detail || f.snippet };
284    });
285    const allText = entries.map(e => e.name).join(', ');
286 
287    const label = document.createElement('div');
288    label.className = 'impeccable-label';
289    Object.assign(label.style, {
290      position: 'absolute', bottom: '100%', left: '-2px',
291      display: 'flex', alignItems: 'center',
292      whiteSpace: 'nowrap',
293      fontSize: '11px', fontWeight: '600', letterSpacing: '0.02em',
294      color: LABEL_INK, lineHeight: '14px',
295      background: LABEL_BG,
296      fontFamily: 'system-ui, sans-serif',
297      borderRadius: '4px 4px 0 0',
298    });
299 
300    const textSpan = document.createElement('span');
301    textSpan.style.padding = '3px 8px';
302    textSpan.textContent = allText;
303    label.appendChild(textSpan);
304 
305    // State for cycling mode
306    let cycleMode = false;
307    let cycleIndex = 0;
308    let isHovered = false;
309    let prevBtn, nextBtn;
310 
311    function updateCycleText() {
312      const e = entries[cycleIndex];
313      textSpan.textContent = isHovered ? e.detail : e.name;
314    }
315 
316    function enableCycleMode() {
317      if (cycleMode || entries.length < 2) return;
318      cycleMode = true;
319 
320      const btnStyle = {
321        background: 'none', border: 'none', color: 'rgba(255,255,255,0.7)',
322        fontSize: '11px', cursor: 'pointer', padding: '3px 4px',
323        fontFamily: 'system-ui, sans-serif', lineHeight: '14px',
324        pointerEvents: 'auto',
325      };
326 
327      const navGroup = document.createElement('span');
328      Object.assign(navGroup.style, {
329        display: 'inline-flex', alignItems: 'center', flexShrink: '0',
330      });
331 
332      prevBtn = document.createElement('button');
333      prevBtn.textContent = '\u2039';
334      Object.assign(prevBtn.style, btnStyle);
335      prevBtn.style.paddingLeft = '6px';
336      prevBtn.addEventListener('click', (e) => {
337        e.stopPropagation();
338        cycleIndex = (cycleIndex - 1 + entries.length) % entries.length;
339        updateCycleText();
340      });
341 
342      nextBtn = document.createElement('button');
343      nextBtn.textContent = '\u203A';
344      Object.assign(nextBtn.style, btnStyle);
345      nextBtn.style.paddingRight = '2px';
346      nextBtn.addEventListener('click', (e) => {
347        e.stopPropagation();
348        cycleIndex = (cycleIndex + 1) % entries.length;
349        updateCycleText();
350      });
351 
352      navGroup.appendChild(prevBtn);
353      navGroup.appendChild(nextBtn);
354      label.insertBefore(navGroup, textSpan);
355      textSpan.style.padding = '3px 8px 3px 4px';
356      updateCycleText();
357    }
358 
359    outline.appendChild(label);
360 
361    // Start hidden; the IntersectionObserver will show it once the target is rendered
362    outline.style.display = 'none';
363    outline._staggerIndex = overlayIndex++;
364    el._impeccableOverlay = outline;
365    visibilityObserver.observe(el);
366 
367    // After first paint, check label width vs outline
368    outline._checkLabel = () => {
369      if (entries.length > 1 && label.offsetWidth > outline.offsetWidth) {
370        enableCycleMode();
371      }
372    };
373 
374    // Hover: show detail text, darken
375    const onMouseEnter = () => {
376      isHovered = true;
377      outline.classList.add('impeccable-hover');
378      outline.style.outlineColor = BRAND_COLOR_HOVER;
379      label.style.background = BRAND_COLOR_HOVER;
380      if (cycleMode) {
381        updateCycleText();
382      } else {
383        textSpan.textContent = entries.map(e => e.detail).join(' | ');
384      }
385    };
386    const onMouseLeave = () => {
387      isHovered = false;
388      outline.classList.remove('impeccable-hover');
389      outline.style.outlineColor = '';
390      label.style.background = LABEL_BG;
391      if (cycleMode) {
392        updateCycleText();
393      } else {
394        textSpan.textContent = allText;
395      }
396    };
397    el.addEventListener('mouseenter', onMouseEnter);
398    el.addEventListener('mouseleave', onMouseLeave);
399    outline._cleanup = () => {
400      el.removeEventListener('mouseenter', onMouseEnter);
401      el.removeEventListener('mouseleave', onMouseLeave);
402    };
403 
404    document.body.appendChild(outline);
405    overlays.push(outline);
406  };
407 
408  const showPageBanner = function(findings) {
409    if (!findings.length) return;
410    const banner = document.createElement('div');
411    banner.className = 'impeccable-overlay impeccable-banner';
412    Object.assign(banner.style, {
413      position: 'fixed', top: '0', left: '0', right: '0', zIndex: '100000',
414      background: LABEL_BG, color: LABEL_INK,
415      fontFamily: 'system-ui, sans-serif', fontSize: '13px',
416      display: 'flex', alignItems: 'center', pointerEvents: 'auto',
417      height: '36px', overflow: 'hidden', maxWidth: '100vw',
418      transform: 'translateY(-100%)',
419      transition: 'transform 0.4s cubic-bezier(0.16, 1, 0.3, 1)',
420    });
421    requestAnimationFrame(() => requestAnimationFrame(() => {
422      banner.style.transform = 'translateY(0)';
423    }));
424 
425    // Scrollable findings area
426    const scrollArea = document.createElement('div');
427    Object.assign(scrollArea.style, {
428      flex: '1', minWidth: '0', overflowX: 'auto', overflowY: 'hidden',
429      display: 'flex', gap: '8px', alignItems: 'center',
430      padding: '0 12px', scrollSnapType: 'x mandatory',
431      scrollbarWidth: 'none',
432    });
433    for (const f of findings) {
434      const prefix = RULE_CATEGORY[f.type] === 'slop' ? '\u2726 ' : '';
435      const tag = document.createElement('span');
436      tag.textContent = `${prefix}${TYPE_LABELS[f.type] || f.type}: ${f.detail}`;
437      Object.assign(tag.style, {
438        background: 'rgba(255,255,255,0.15)', padding: '2px 8px',
439        borderRadius: '3px', fontSize: '12px', fontFamily: 'ui-monospace, monospace',
440        whiteSpace: 'nowrap', flexShrink: '0', scrollSnapAlign: 'start',
441      });
442      scrollArea.appendChild(tag);
443    }
444    banner.appendChild(scrollArea);
445 
446    // Controls area (only in standalone mode, not extension)
447    if (!EXTENSION_MODE) {
448      const controls = document.createElement('div');
449      Object.assign(controls.style, {
450        display: 'flex', alignItems: 'center', gap: '2px',
451        padding: '0 8px', flexShrink: '0',
452      });
453 
454      // Toggle visibility button
455      const toggle = document.createElement('button');
456      toggle.textContent = '\u25C9'; // circle with dot (visible state)
457      toggle.title = 'Toggle overlay visibility';
458      Object.assign(toggle.style, {
459        background: 'none', border: 'none',
460        color: 'white', fontSize: '16px', cursor: 'pointer', padding: '0 4px',
461        opacity: '0.85', transition: 'opacity 0.15s',
462      });
463      let overlaysVisible = true;
464      toggle.addEventListener('click', () => {
465        overlaysVisible = !overlaysVisible;
466        document.body.classList.toggle('impeccable-hidden', !overlaysVisible);
467        toggle.textContent = overlaysVisible ? '\u25C9' : '\u25CB'; // filled vs empty circle
468        toggle.style.opacity = overlaysVisible ? '0.85' : '0.5';
469      });
470      controls.appendChild(toggle);
471 
472      // Close button
473      const close = document.createElement('button');
474      close.textContent = '\u00d7';
475      close.title = 'Dismiss banner';
476      Object.assign(close.style, {
477        background: 'none', border: 'none',
478        color: 'white', fontSize: '18px', cursor: 'pointer', padding: '0 4px',
479      });
480      close.addEventListener('click', () => banner.remove());
481      controls.appendChild(close);
482 
483      banner.appendChild(controls);
484    }
485    document.body.appendChild(banner);
486    overlays.push(banner);
487  };
488 
489  // Heuristic for skipping CSS-in-JS hashed class names like "css-1a2b3c" or "_2x4hG_".
490  // These change between builds and produce brittle, ugly selectors.
491  function isLikelyHashedClass(c) {
492    if (!c) return true;
493    if (/^(css|sc|emotion|jsx|module)-[\w-]{4,}$/i.test(c)) return true;
494    if (/^_[\w-]{5,}$/.test(c)) return true;
495    if (/^[a-z0-9]{6,}$/i.test(c) && /\d/.test(c)) return true;
496    return false;
497  }
498 
499  function buildSelectorSegment(el) {
500    const tag = el.tagName.toLowerCase();
501    let sel = tag;
502 
503    if (el.classList && el.classList.length > 0) {
504      const classes = [...el.classList]
505        .filter(c => !c.startsWith('impeccable-') && !isLikelyHashedClass(c))
506        .slice(0, 2);
507      if (classes.length > 0) {
508        sel += '.' + classes.map(c => CSS.escape(c)).join('.');
509      }
510    }
511 
512    // Disambiguate among siblings only if the parent has multiple matches
513    const parent = el.parentElement;
514    if (parent) {
515      try {
516        const matching = parent.querySelectorAll(':scope > ' + sel);
517        if (matching.length > 1) {
518          const sameType = [...parent.children].filter(c => c.tagName === el.tagName);
519          const idx = sameType.indexOf(el) + 1;
520          sel += `:nth-of-type(${idx})`;
521        }
522      } catch {
523        const idx = [...parent.children].indexOf(el) + 1;
524        sel = `${tag}:nth-child(${idx})`;
525      }
526    }
527    return sel;
528  }
529 
530  function generateSelector(el) {
531    if (el === document.body) return 'body';
532    if (el === document.documentElement) return 'html';
533    if (el.id) return '#' + CSS.escape(el.id);
534 
535    const parts = [];
536    let current = el;
537    let depth = 0;
538    const MAX_DEPTH = 10;
539 
540    while (current && current !== document.body && current !== document.documentElement && depth < MAX_DEPTH) {
541      parts.unshift(buildSelectorSegment(current));
542 
543      // Anchor on an ancestor's ID and stop walking up
544      if (current.id) {
545        parts[0] = '#' + CSS.escape(current.id);
546        break;
547      }
548 
549      // Stop as soon as the partial selector uniquely identifies the target
550      const trySelector = parts.join(' > ');
551      try {
552        const matches = document.querySelectorAll(trySelector);
553        if (matches.length === 1 && matches[0] === el) {
554          return trySelector;
555        }
556      } catch { /* invalid selector — keep walking */ }
557 
558      current = current.parentElement;
559      depth++;
560    }
561 
562    return parts.join(' > ');
563  }
564 
565  function getDirectText(el) {
566    return [...el.childNodes]
567      .filter(n => n.nodeType === 3)
568      .map(n => n.textContent || '')
569      .join('');
570  }
571 
572  function getDirectTextRect(el) {
573    const rects = [];
574    for (const node of el.childNodes) {
575      if (node.nodeType !== 3 || !(node.textContent || '').trim()) continue;
576      const range = document.createRange();
577      range.selectNodeContents(node);
578      for (const rect of range.getClientRects()) {
579        if (rect.width >= 1 && rect.height >= 1) rects.push(rect);
580      }
581      range.detach?.();
582    }
583    if (rects.length === 0) return null;
584    const left = Math.min(...rects.map(r => r.left));
585    const top = Math.min(...rects.map(r => r.top));
586    const right = Math.max(...rects.map(r => r.right));
587    const bottom = Math.max(...rects.map(r => r.bottom));
588    return {
589      left,
590      top,
591      right,
592      bottom,
593      width: right - left,
594      height: bottom - top,
595      x: left,
596      y: top,
597    };
598  }
599 
600  function collectVisualContrastReasons(el, style) {
601    const reasons = new Set();
602    const bgClip = style.webkitBackgroundClip || style.backgroundClip || '';
603    const ownBgImage = style.backgroundImage || '';
604    if (bgClip === 'text' && ownBgImage && ownBgImage !== 'none') {
605      reasons.add('background-clip text');
606    }
607    if (style.textShadow && style.textShadow !== 'none') reasons.add('text shadow');
608 
609    let current = el;
610    while (current && current.nodeType === 1) {
611      const tag = current.tagName?.toLowerCase();
612      const currentStyle = getComputedStyle(current);
613      const bgImage = currentStyle.backgroundImage || '';
614      const isDocumentSurface = tag === 'body' || tag === 'html';
615 
616      if (!isDocumentSurface && bgImage && bgImage !== 'none') {
617        if (/url\s*\(/i.test(bgImage)) reasons.add('image background');
618        if (/gradient/i.test(bgImage)) reasons.add('gradient background');
619      }
620      if (parseFloat(currentStyle.opacity) < 0.99) reasons.add('opacity stack');
621      if (currentStyle.mixBlendMode && currentStyle.mixBlendMode !== 'normal') reasons.add('blend mode');
622      if (currentStyle.filter && currentStyle.filter !== 'none') reasons.add('filter');
623      if (currentStyle.backdropFilter && currentStyle.backdropFilter !== 'none') reasons.add('backdrop filter');
624 
625      const solidBg = parseRgb(currentStyle.backgroundColor);
626      if (solidBg && solidBg.a >= 0.95 && (!bgImage || bgImage === 'none')) break;
627      current = current.parentElement;
628    }
629 
630    const sampleRect = getDirectTextRect(el) || el.getBoundingClientRect();
631    if (sampleRect && document.elementsFromPoint) {
632      const points = [
633        [sampleRect.left + sampleRect.width / 2, sampleRect.top + sampleRect.height / 2],
634        [sampleRect.left + Math.min(sampleRect.width - 1, Math.max(1, sampleRect.width * 0.25)), sampleRect.top + sampleRect.height / 2],
635        [sampleRect.left + Math.min(sampleRect.width - 1, Math.max(1, sampleRect.width * 0.75)), sampleRect.top + sampleRect.height / 2],
636      ];
637      for (const [x, y] of points) {
638        if (x < 0 || y < 0 || x > window.innerWidth || y > window.innerHeight) continue;
639        const stack = document.elementsFromPoint(x, y);
640        const selfIndex = stack.findIndex(node => node === el || el.contains(node) || node.contains?.(el));
641        if (selfIndex < 0) continue;
642        for (const node of stack.slice(selfIndex + 1)) {
643          const nodeTag = node.tagName?.toLowerCase();
644          if (nodeTag === 'img' || nodeTag === 'picture' || nodeTag === 'video' || nodeTag === 'canvas' || nodeTag === 'svg') {
645            reasons.add(`${nodeTag} underlay`);
646            break;
647          }
648        }
649      }
650    }
651 
652    return [...reasons];
653  }
654 
655  function collectVisualContrastCandidates(options = {}) {
656    const maxCandidates = Number.isFinite(options.maxCandidates) ? options.maxCandidates : 12;
657    const candidates = [];
658    for (const el of document.querySelectorAll('*')) {
659      if (candidates.length >= maxCandidates) break;
660      if (el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
661      if (el.closest('[id^="impeccable-live-"]')) continue;
662      if (el === document.body || el === document.documentElement) continue;
663 
664      const tag = el.tagName.toLowerCase();
665      const style = getComputedStyle(el);
666      if (style.display === 'none' || style.visibility === 'hidden') continue;
667      const directText = getDirectText(el);
668      const hasDirectText = directText.trim().length > 0;
669      if (!hasDirectText || isEmojiOnlyText(directText)) continue;
670 
671      const bgColor = readOwnBackgroundColor(el, style);
672      const isStyledButton = (tag === 'a' || tag === 'button')
673        && bgColor && bgColor.a > 0.5;
674      if (SAFE_TAGS.has(tag) && !isStyledButton) continue;
675 
676      const rect = getDirectTextRect(el) || el.getBoundingClientRect();
677      if (!rect || rect.width < 4 || rect.height < 4) continue;
678 
679      const reasons = collectVisualContrastReasons(el, style);
680      if (reasons.length === 0) continue;
681 
682      const textColor = parseRgb(style.color);
683      const fontSize = parseFloat(style.fontSize) || 16;
684      const fontWeight = parseInt(style.fontWeight) || 400;
685      const isLargeText = fontSize >= WCAG_LARGE_TEXT_PX || (fontSize >= WCAG_LARGE_BOLD_TEXT_PX && fontWeight >= 700);
686      const threshold = isLargeText ? 3.0 : 4.5;
687      const clip = {
688        x: Math.max(0, Math.floor(rect.left + window.scrollX - 2)),
689        y: Math.max(0, Math.floor(rect.top + window.scrollY - 2)),
690        width: Math.max(1, Math.ceil(rect.width + 4)),
691        height: Math.max(1, Math.ceil(rect.height + 4)),
692      };
693 
694      candidates.push({
695        selector: generateSelector(el),
696        tagName: tag,
697        text: directText.trim().replace(/\s+/g, ' ').slice(0, 80),
698        threshold,
699        reasons,
700        clip,
701        textColor,
702        preferRenderedForeground: !textColor || textColor.a < 0.99 || reasons.some(reason =>
703          reason === 'opacity stack' ||
704          reason === 'blend mode' ||
705          reason === 'filter' ||
706          reason === 'backdrop filter' ||
707          reason === 'background-clip text'
708        ),
709        backgroundClipText: reasons.includes('background-clip text'),
710      });
711    }
712    return candidates;
713  }
714 
715  const visualContrastImageCache = new Map();
716  const visualContrastRasterCache = new WeakMap();
717 
718  function clampByte(value) {
719    return Math.max(0, Math.min(255, Math.round(value)));
720  }
721 
722  function blendRgba(fg, bg) {
723    if (!fg) return bg || null;
724    if (!bg || fg.a == null || fg.a >= 0.999) {
725      return { r: clampByte(fg.r), g: clampByte(fg.g), b: clampByte(fg.b), a: fg.a == null ? 1 : fg.a };
726    }
727    const alpha = Math.max(0, Math.min(1, fg.a));
728    return {
729      r: clampByte(fg.r * alpha + bg.r * (1 - alpha)),
730      g: clampByte(fg.g * alpha + bg.g * (1 - alpha)),
731      b: clampByte(fg.b * alpha + bg.b * (1 - alpha)),
732      a: 1,
733    };
734  }
735 
736  function pickWorstContrastColor(textColor, colors) {
737    const usable = (colors || []).filter(Boolean);
738    if (!usable.length) return null;
739    let worst = usable[0];
740    let worstRatio = contrastRatio(textColor, worst);
741    for (const color of usable.slice(1)) {
742      const ratio = contrastRatio(textColor, color);
743      if (ratio < worstRatio) {
744        worst = color;
745        worstRatio = ratio;
746      }
747    }
748    return worst;
749  }
750 
751  function firstCssUrl(value) {
752    const match = String(value || '').match(/url\((?:"([^"]+)"|'([^']+)'|([^)]*))\)/i);
753    if (!match) return '';
754    return (match[1] || match[2] || match[3] || '').trim();
755  }
756 
757  function getLayerValue(value, index = 0) {
758    return String(value || '').split(',')[index]?.trim() || '';
759  }
760 
761  function parsePositionToken(token, container, painted) {
762    if (!token || token === 'center') return (container - painted) / 2;
763    if (token === 'left' || token === 'top') return 0;
764    if (token === 'right' || token === 'bottom') return container - painted;
765    if (/%$/.test(token)) {
766      const pct = parseFloat(token) / 100;
767      return (container - painted) * pct;
768    }
769    if (/px$/.test(token)) return parseFloat(token) || 0;
770    return (container - painted) / 2;
771  }
772 
773  function parsePositionPair(positionValue) {
774    const tokens = String(positionValue || '50% 50%').trim().split(/\s+/).filter(Boolean);
775    const first = tokens[0] || '50%';
776    if (tokens.length < 2) {
777      if (first === 'top' || first === 'bottom') return ['50%', first];
778      return [first, '50%'];
779    }
780    return [first, tokens[1] || '50%'];
781  }
782 
783  function resolvePaintedImageRect(containerRect, image, sizeValue, positionValue) {
784    const intrinsicWidth = image.naturalWidth || image.videoWidth || image.width || 1;
785    const intrinsicHeight = image.naturalHeight || image.videoHeight || image.height || 1;
786    let paintedWidth = intrinsicWidth;
787    let paintedHeight = intrinsicHeight;
788    const size = String(sizeValue || 'auto').trim();
789 
790    if (size === 'cover' || size === 'contain') {
791      const scale = size === 'cover'
792        ? Math.max(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight)
793        : Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight);
794      paintedWidth = intrinsicWidth * scale;
795      paintedHeight = intrinsicHeight * scale;
796    } else if (size && size !== 'auto') {
797      const parts = size.split(/\s+/);
798      const widthToken = parts[0];
799      const heightToken = parts[1] || 'auto';
800      if (/%$/.test(widthToken)) paintedWidth = containerRect.width * (parseFloat(widthToken) / 100);
801      else if (/px$/.test(widthToken)) paintedWidth = parseFloat(widthToken) || paintedWidth;
802      if (heightToken === 'auto') paintedHeight = paintedWidth * (intrinsicHeight / intrinsicWidth);
803      else if (/%$/.test(heightToken)) paintedHeight = containerRect.height * (parseFloat(heightToken) / 100);
804      else if (/px$/.test(heightToken)) paintedHeight = parseFloat(heightToken) || paintedHeight;
805    }
806 
807    const [xToken, yToken] = parsePositionPair(positionValue);
808    const positionX = parsePositionToken(xToken, containerRect.width, paintedWidth);
809    const positionY = parsePositionToken(yToken, containerRect.height, paintedHeight);
810    return {
811      left: containerRect.left + positionX,
812      top: containerRect.top + positionY,
813      width: paintedWidth,
814      height: paintedHeight,
815      intrinsicWidth,
816      intrinsicHeight,
817    };
818  }
819 
820  function parseObjectPosition(positionValue) {
821    return parsePositionPair(positionValue);
822  }
823 
824  function resolveObjectImageRect(containerRect, image, style) {
825    const intrinsicWidth = image.naturalWidth || image.videoWidth || image.width || 1;
826    const intrinsicHeight = image.naturalHeight || image.videoHeight || image.height || 1;
827    const fit = style.objectFit || 'fill';
828    let paintedWidth = containerRect.width;
829    let paintedHeight = containerRect.height;
830    if (fit === 'contain' || fit === 'cover') {
831      const scale = fit === 'cover'
832        ? Math.max(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight)
833        : Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight);
834      paintedWidth = intrinsicWidth * scale;
835      paintedHeight = intrinsicHeight * scale;
836    } else if (fit === 'none') {
837      paintedWidth = intrinsicWidth;
838      paintedHeight = intrinsicHeight;
839    } else if (fit === 'scale-down') {
840      const containScale = Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight, 1);
841      paintedWidth = intrinsicWidth * containScale;
842      paintedHeight = intrinsicHeight * containScale;
843    }
844    const [xToken, yToken] = parseObjectPosition(style.objectPosition);
845    return {
846      left: containerRect.left + parsePositionToken(xToken, containerRect.width, paintedWidth),
847      top: containerRect.top + parsePositionToken(yToken, containerRect.height, paintedHeight),
848      width: paintedWidth,
849      height: paintedHeight,
850      intrinsicWidth,
851      intrinsicHeight,
852    };
853  }
854 
855  function pointToImageSource(point, paintedRect) {
856    if (
857      point.x < paintedRect.left ||
858      point.y < paintedRect.top ||
859      point.x > paintedRect.left + paintedRect.width ||
860      point.y > paintedRect.top + paintedRect.height
861    ) {
862      return null;
863    }
864    return {
865      x: Math.max(0, Math.min(paintedRect.intrinsicWidth - 1, ((point.x - paintedRect.left) / paintedRect.width) * paintedRect.intrinsicWidth)),
866      y: Math.max(0, Math.min(paintedRect.intrinsicHeight - 1, ((point.y - paintedRect.top) / paintedRect.height) * paintedRect.intrinsicHeight)),
867    };
868  }
869 
870  async function loadVisualContrastImage(src) {
871    if (!src) return null;
872    if (visualContrastImageCache.has(src)) return visualContrastImageCache.get(src);
873    const promise = new Promise(resolve => {
874      const img = new Image();
875      let settled = false;
876      const finish = value => {
877        if (settled) return;
878        settled = true;
879        clearTimeout(timer);
880        resolve(value);
881      };
882      const timer = setTimeout(() => finish(null), 800);
883      try {
884        const absolute = new URL(src, location.href);
885        if (absolute.origin !== location.origin && absolute.protocol !== 'data:' && absolute.protocol !== 'blob:') {
886          img.crossOrigin = 'anonymous';
887        }
888      } catch {
889        // Let the browser resolve unusual URLs itself.
890      }
891      img.onload = () => finish(img);
892      img.onerror = () => finish(null);
893      img.src = src;
894    });
895    visualContrastImageCache.set(src, promise);
896    return promise;
897  }
898 
899  function sampleDrawablePixel(drawable, sourcePoint) {
900    if (visualContrastRasterCache.has(drawable)) {
901      const cached = visualContrastRasterCache.get(drawable);
902      if (!cached || !cached.ctx) return { status: 'unresolved', reason: cached?.reason || 'image sample failed' };
903      try {
904        const x = Math.max(0, Math.min(cached.width - 1, Math.floor(sourcePoint.x * cached.scaleX)));
905        const y = Math.max(0, Math.min(cached.height - 1, Math.floor(sourcePoint.y * cached.scaleY)));
906        const data = cached.ctx.getImageData(x, y, 1, 1).data;
907        return {
908          status: 'sampled',
909          color: { r: data[0], g: data[1], b: data[2], a: data[3] / 255 },
910        };
911      } catch (err) {
912        return {
913          status: 'unresolved',
914          reason: /taint|cross-origin|Security/i.test(err?.message || '') ? 'tainted image' : 'image sample failed',
915        };
916      }
917    }
918 
919    const canvas = document.createElement('canvas');
920    const intrinsicWidth = drawable.naturalWidth || drawable.videoWidth || drawable.width || 1;
921    const intrinsicHeight = drawable.naturalHeight || drawable.videoHeight || drawable.height || 1;
922    const maxRasterSide = 640;
923    const scale = Math.min(1, maxRasterSide / Math.max(intrinsicWidth, intrinsicHeight));
924    canvas.width = Math.max(1, Math.round(intrinsicWidth * scale));
925    canvas.height = Math.max(1, Math.round(intrinsicHeight * scale));
926    const ctx = canvas.getContext('2d', { willReadFrequently: true });
927    if (!ctx) return { status: 'unresolved', reason: 'canvas unavailable' };
928    try {
929      ctx.drawImage(drawable, 0, 0, canvas.width, canvas.height);
930      const cached = {
931        ctx,
932        width: canvas.width,
933        height: canvas.height,
934        scaleX: canvas.width / intrinsicWidth,
935        scaleY: canvas.height / intrinsicHeight,
936      };
937      visualContrastRasterCache.set(drawable, cached);
938      const x = Math.max(0, Math.min(cached.width - 1, Math.floor(sourcePoint.x * cached.scaleX)));
939      const y = Math.max(0, Math.min(cached.height - 1, Math.floor(sourcePoint.y * cached.scaleY)));
940      const data = ctx.getImageData(x, y, 1, 1).data;
941      return {
942        status: 'sampled',
943        color: { r: data[0], g: data[1], b: data[2], a: data[3] / 255 },
944      };
945    } catch (err) {
946      const reason = /taint|cross-origin|Security/i.test(err?.message || '') ? 'tainted image' : 'image sample failed';
947      visualContrastRasterCache.set(drawable, { ctx: null, reason });
948      return {
949        status: 'unresolved',
950        reason,
951      };
952    }
953  }
954 
955  async function sampleCssBackground(el, style, point, textColor) {
956    const rect = el.getBoundingClientRect();
957    const bgImage = style.backgroundImage || '';
958    if (bgImage && bgImage !== 'none') {
959      if (/gradient/i.test(bgImage)) {
960        const color = pickWorstContrastColor(textColor, parseGradientColors(bgImage));
961        if (color) return { status: 'sampled', color, method: 'analytic-gradient' };
962      }
963      if (/url\s*\(/i.test(bgImage)) {
964        const img = await loadVisualContrastImage(firstCssUrl(bgImage));
965        if (!img) return { status: 'unresolved', reason: 'image unavailable' };
966        const paintedRect = resolvePaintedImageRect(
967          rect,
968          img,
969          getLayerValue(style.backgroundSize) || 'auto',
970          getLayerValue(style.backgroundPosition) || '50% 50%',
971        );
972        const sourcePoint = pointToImageSource(point, paintedRect);
973        if (!sourcePoint) return { status: 'unresolved', reason: 'point outside background image' };
974        const sample = sampleDrawablePixel(img, sourcePoint);
975        if (sample.status === 'sampled') return { ...sample, method: 'canvas-background-image' };
976        return sample;
977      }
978    }
979    const bg = parseRgb(style.backgroundColor);
980    if (bg && bg.a > 0.05) return { status: 'sampled', color: bg, method: 'solid-background' };
981    return { status: 'unresolved', reason: 'no readable background' };
982  }
983 
984  async function sampleImageElement(img, point) {
985    const rect = img.getBoundingClientRect();
986    const style = getComputedStyle(img);
987    const paintedRect = resolveObjectImageRect(rect, img, style);
988    const sourcePoint = pointToImageSource(point, paintedRect);
989    if (!sourcePoint) return { status: 'unresolved', reason: 'point outside image' };
990    const sample = sampleDrawablePixel(img, sourcePoint);
991    if (sample.status === 'sampled') return { ...sample, method: 'canvas-img-underlay' };
992 
993    if (img.currentSrc || img.src) {
994      const loaded = await loadVisualContrastImage(img.currentSrc || img.src);
995      if (loaded) {
996        const loadedRect = { ...paintedRect, intrinsicWidth: loaded.naturalWidth || loaded.width || paintedRect.intrinsicWidth, intrinsicHeight: loaded.naturalHeight || loaded.height || paintedRect.intrinsicHeight };
997        const loadedPoint = pointToImageSource(point, loadedRect);
998        if (loadedPoint) {
999          const loadedSample = sampleDrawablePixel(loaded, loadedPoint);
1000          if (loadedSample.status === 'sampled') return { ...loadedSample, method: 'canvas-img-underlay' };
1001        }
1002      }
1003    }
1004    return sample;
1005  }
1006 
1007  function textSamplePoints(rect) {
1008    const insetX = Math.min(12, Math.max(1, rect.width * 0.12));
1009    const insetY = Math.min(8, Math.max(1, rect.height * 0.22));
1010    const xs = rect.width < 28
1011      ? [rect.left + rect.width / 2]
1012      : [rect.left + insetX, rect.left + rect.width / 2, rect.right - insetX];
1013    const ys = rect.height < 22
1014      ? [rect.top + rect.height / 2]
1015      : [rect.top + insetY, rect.top + rect.height / 2, rect.bottom - insetY];
1016    const points = [];
1017    for (const y of ys) {
1018      for (const x of xs) {
1019        if (x >= 0 && y >= 0 && x <= window.innerWidth && y <= window.innerHeight) points.push({ x, y });
1020      }
1021    }
1022    return points;
1023  }
1024 
1025  async function sampleVisualBackgroundAtPoint(el, point, textColor, depth = 0) {
1026    if (depth > 8) {
1027      return { status: 'unresolved', reason: 'background stack too deep' };
1028    }
1029    const stack = typeof document.elementsFromPoint === 'function'
1030      ? document.elementsFromPoint(point.x, point.y)
1031      : [];
1032    const selfIndex = stack.findIndex(node => node === el || el.contains(node));
1033    const nodes = selfIndex >= 0 ? stack.slice(selfIndex) : [el, ...stack];
1034    const unresolved = [];
1035 
1036    for (const node of nodes) {
1037      if (!node || node.nodeType !== 1) continue;
1038      if (node.closest?.('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
1039      const tag = node.tagName?.toLowerCase();
1040      if (tag === 'img') {
1041        const sample = await sampleImageElement(node, point);
1042        if (sample.status === 'sampled') return sample;
1043        unresolved.push(sample.reason);
1044        continue;
1045      }
1046      if (tag === 'canvas' || tag === 'video') {
1047        const rect = node.getBoundingClientRect();
1048        const sourcePoint = pointToImageSource(point, {
1049          left: rect.left,
1050          top: rect.top,
1051          width: rect.width,
1052          height: rect.height,
1053          intrinsicWidth: node.width || node.videoWidth || rect.width,
1054          intrinsicHeight: node.height || node.videoHeight || rect.height,
1055        });
1056        if (sourcePoint) {
1057          const sample = sampleDrawablePixel(node, sourcePoint);
1058          if (sample.status === 'sampled') return { ...sample, method: `canvas-${tag}-underlay` };
1059          unresolved.push(sample.reason);
1060        }
1061        continue;
1062      }
1063      const style = getComputedStyle(node);
1064      const sample = await sampleCssBackground(node, style, point, textColor);
1065      if (sample.status === 'sampled') {
1066        if (!sample.color || sample.color.a == null || sample.color.a >= 0.95) return sample;
1067        const under = await sampleVisualBackgroundAtPoint(node.parentElement || document.body, point, textColor, depth + 1);
1068        if (under.status === 'sampled') {
1069          return {
1070            status: 'sampled',
1071            color: blendRgba(sample.color, under.color),
1072            method: `${sample.method}+alpha`,
1073          };
1074        }
1075        return sample;
1076      }
1077      unresolved.push(sample.reason);
1078    }
1079 
1080    return {
1081      status: 'unresolved',
1082      reason: [...new Set(unresolved.filter(Boolean))].slice(0, 3).join(', ') || 'no readable visual background',
1083    };
1084  }
1085 
1086  async function analyzeVisualContrastCandidate(candidate) {
1087    let el;
1088    try {
1089      el = document.querySelector(candidate.selector);
1090    } catch {
1091      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'stale selector' };
1092    }
1093    if (!el) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'missing element' };
1094 
1095    const blockingReason = (candidate.reasons || []).find(reason =>
1096      reason === 'background-clip text' ||
1097      reason === 'blend mode' ||
1098      reason === 'filter' ||
1099      reason === 'backdrop filter' ||
1100      reason === 'opacity stack' ||
1101      reason === 'text shadow'
1102    );
1103    if (blockingReason) {
1104      return { ...candidate, status: 'unresolved', confidence: 'none', reason: `${blockingReason} needs screenshot pixels` };
1105    }
1106 
1107    const style = getComputedStyle(el);
1108    const textColor = parseRgb(style.color) || candidate.textColor;
1109    if (!textColor) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'unreadable text color' };
1110 
1111    const rect = getDirectTextRect(el) || el.getBoundingClientRect();
1112    if (!rect || rect.width < 4 || rect.height < 4) {
1113      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'missing text rect' };
1114    }
1115 
1116    const points = textSamplePoints(rect);
1117    if (points.length === 0) {
1118      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'text outside viewport' };
1119    }
1120 
1121    const ratios = [];
1122    const methods = new Set();
1123    const unresolved = [];
1124    for (const point of points) {
1125      const sample = await sampleVisualBackgroundAtPoint(el, point, textColor);
1126      if (sample.status !== 'sampled' || !sample.color) {
1127        unresolved.push(sample.reason);
1128        continue;
1129      }
1130      const fg = blendRgba(textColor, sample.color);
1131      ratios.push(contrastRatio(fg, sample.color));
1132      if (sample.method) methods.add(sample.method);
1133    }
1134 
1135    if (ratios.length < Math.min(3, points.length)) {
1136      return {
1137        ...candidate,
1138        status: 'unresolved',
1139        confidence: 'none',
1140        samples: ratios.length,
1141        reason: [...new Set(unresolved.filter(Boolean))].slice(0, 3).join(', ') || 'not enough readable samples',
1142      };
1143    }
1144 
1145    ratios.sort((a, b) => a - b);
1146    const pick = pct => ratios[Math.min(ratios.length - 1, Math.max(0, Math.floor((pct / 100) * ratios.length)))];
1147    const measuredRatio = pick(10);
1148    const medianRatio = pick(50);
1149    const status = measuredRatio < candidate.threshold ? 'fail' : 'pass';
1150    const method = [...methods].sort().join(', ') || 'browser-visual';
1151    const textLabel = candidate.text ? ` "${candidate.text}"` : '';
1152    const detail = `browser contrast ${measuredRatio.toFixed(1)}:1 median ${medianRatio.toFixed(1)}:1 (need ${candidate.threshold}:1) via ${method}${textLabel}`;
1153    return {
1154      ...candidate,
1155      status,
1156      confidence: method.includes('canvas-') ? 'high' : 'medium',
1157      method,
1158      ratio: measuredRatio,
1159      medianRatio,
1160      samples: ratios.length,
1161      finding: status === 'fail' ? { id: 'low-contrast', snippet: detail } : null,
1162    };
1163  }
1164 
1165  function waitForVisualPaint() {
1166    return new Promise(resolve => {
1167      requestAnimationFrame(() => requestAnimationFrame(resolve));
1168    });
1169  }
1170 
1171  async function analyzeVisualContrast(options = {}) {
1172    const candidates = collectVisualContrastCandidates(options);
1173    const results = [];
1174    const shouldScrollOffscreen = options.scrollOffscreen === true;
1175    const restoreScroll = { x: window.scrollX, y: window.scrollY };
1176    for (const candidate of candidates) {
1177      if (shouldScrollOffscreen && (window.scrollX !== restoreScroll.x || window.scrollY !== restoreScroll.y)) {
1178        window.scrollTo(restoreScroll.x, restoreScroll.y);
1179        await waitForVisualPaint();
1180      }
1181      let result = await analyzeVisualContrastCandidate(candidate);
1182      if (shouldScrollOffscreen && result.status === 'unresolved' && result.reason === 'text outside viewport') {
1183        let el = null;
1184        try {
1185          el = document.querySelector(candidate.selector);
1186        } catch {
1187          el = null;
1188        }
1189        if (el && typeof el.scrollIntoView === 'function') {
1190          el.scrollIntoView({ block: 'center', inline: 'nearest', behavior: 'instant' });
1191          await waitForVisualPaint();
1192          result = await analyzeVisualContrastCandidate(candidate);
1193        }
1194      }
1195      results.push(result);
1196    }
1197    if (shouldScrollOffscreen && (window.scrollX !== restoreScroll.x || window.scrollY !== restoreScroll.y)) {
1198      window.scrollTo(restoreScroll.x, restoreScroll.y);
1199    }
1200    return results;
1201  }
1202 
1203  function isElementHidden(el) {
1204    if (!el || el === document.body || el === document.documentElement) return false;
1205    if (typeof el.checkVisibility === 'function') return !el.checkVisibility({ checkOpacity: false, checkVisibilityCSS: true });
1206    // Fallback: zero size or no offsetParent (covers display:none and detached subtrees)
1207    return el.offsetWidth === 0 && el.offsetHeight === 0;
1208  }
1209 
1210  function serializeFindings(allFindings) {
1211    return allFindings.map(({ el, findings }) => ({
1212      selector: generateSelector(el),
1213      tagName: el.tagName?.toLowerCase() || 'unknown',
1214      rect: (el !== document.body && el !== document.documentElement && el.getBoundingClientRect)
1215        ? el.getBoundingClientRect().toJSON() : null,
1216      isPageLevel: el === document.body || el === document.documentElement,
1217      isHidden: isElementHidden(el),
1218      findings: findings.map(f => {
1219        const ap = ANTIPATTERNS.find(a => a.id === (f.type || f.id));
1220        return {
1221          type: f.type || f.id,
1222          category: ap ? ap.category : 'quality',
1223          severity: ap?.severity || 'warning',
1224          detail: f.detail || f.snippet,
1225          name: ap ? ap.name : (f.type || f.id),
1226          description: ap ? ap.description : '',
1227        };
1228      }),
1229    }));
1230  }
1231 
1232  const printSummary = function(allFindings) {
1233    if (allFindings.length === 0) {
1234      console.log('%c[impeccable] No anti-patterns found.', 'color: #22c55e; font-weight: bold');
1235      return;
1236    }
1237    console.group(
1238      `%c[impeccable] ${allFindings.length} anti-pattern${allFindings.length === 1 ? '' : 's'} found`,
1239      'color: oklch(84% 0.19 80.46); font-weight: bold'
1240    );
1241    for (const { el, findings } of allFindings) {
1242      for (const f of findings) {
1243        console.log(`%c${f.type || f.id}%c ${f.detail || f.snippet}`,
1244          'color: oklch(84% 0.19 80.46); font-weight: bold', 'color: inherit', el);
1245      }
1246    }
1247    console.groupEnd();
1248  };
1249 
1250  function addBrowserFindings(groupMap, el, findings) {
1251    if (!findings || findings.length === 0) return;
1252    const existing = groupMap.get(el);
1253    if (existing) existing.push(...findings);
1254    else groupMap.set(el, [...findings]);
1255  }
1256 
1257  function browserFindingsFromMap(groupMap) {
1258    return [...groupMap.entries()].map(([el, findings]) => ({ el, findings }));
1259  }
1260 
1261  function collectBrowserFindings() {
1262    const groupMap = new Map();
1263    const _disabled = EXTENSION_MODE ? (window.__IMPECCABLE_CONFIG__?.disabledRules || []) : [];
1264    const _ruleOk = (id) => !_disabled.length || !_disabled.includes(id);
1265    // Note: provider-gated rules (--gpt / --gemini) are NOT filtered here. In a
1266    // real browser env (detector page, live overlay, extension) running every
1267    // check is free, so we always surface them; the gating is purely a CLI
1268    // output concern, applied in the Node engines' detect* return paths.
1269 
1270    for (const el of document.querySelectorAll('*')) {
1271      // Skip impeccable's own elements and any descendants (overlays, labels, banner, nav buttons)
1272      if (el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
1273      // Skip browser extension elements (Claude, etc.)
1274      const elId = el.id || '';
1275      if (elId.startsWith('claude-') || elId.startsWith('cic-')) continue;
1276      // Skip the impeccable live-mode overlay (highlight, tooltip, bar, picker, toast).
1277      // These are inspector chrome, not part of the user's design.
1278      if (el.closest('[id^="impeccable-live-"]')) continue;
1279      // Skip html/body -- page-level findings go in the banner, not a full-page overlay
1280      if (el === document.body || el === document.documentElement) continue;
1281 
1282      const findings = [
1283        ...checkElementBordersDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1284        ...checkElementColorsDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1285        ...checkElementMotionDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1286        ...checkElementGlowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1287        ...checkElementAIPaletteDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1288        ...checkElementIconTileDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1289        ...checkElementItalicSerifDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1290        ...checkElementQualityDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1291        ...checkElementOversizedH1DOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1292        ...checkElementClippedOverflowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1293        ...checkElementGptBorderShadowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1294        ...checkElementTextOverflowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
1295      ].filter(f => _ruleOk(f.type));
1296 
1297      addBrowserFindings(groupMap, el, findings);
1298 
1299      // Hero eyebrow: the offending element is the eyebrow above the heading,
1300      // not the heading itself — highlight the previous sibling instead.
1301      const eyebrowFindings = checkElementHeroEyebrowDOM(el)
1302        .map(f => ({ type: f.id, detail: f.snippet }))
1303        .filter(f => _ruleOk(f.type));
1304      if (eyebrowFindings.length > 0 && el.previousElementSibling) {
1305        addBrowserFindings(groupMap, el.previousElementSibling, eyebrowFindings);
1306      }
1307    }
1308 
1309    const pageLevelFindings = [];
1310 
1311    const typoFindings = checkTypography().filter(f => _ruleOk(f.type));
1312    if (typoFindings.length > 0) {
1313      pageLevelFindings.push(...typoFindings);
1314      addBrowserFindings(groupMap, document.body, typoFindings);
1315    }
1316 
1317    const sectionKickerFindings = checkRepeatedSectionKickersDOM()
1318      .map(f => ({ type: f.id, detail: f.snippet }))
1319      .filter(f => _ruleOk(f.type));
1320    if (sectionKickerFindings.length > 0) {
1321      pageLevelFindings.push(...sectionKickerFindings);
1322      addBrowserFindings(groupMap, document.body, sectionKickerFindings);
1323    }
1324 
1325    const layoutFindings = checkLayout().filter(f => _ruleOk(f.type));
1326    for (const f of layoutFindings) {
1327      const el = f.el || document.body;
1328      addBrowserFindings(groupMap, el, [{ type: f.type, detail: f.detail || f.snippet }]);
1329    }
1330 
1331    // Page-level quality checks (headings, etc.)
1332    const qualityFindings = checkPageQualityDOM().filter(f => _ruleOk(f.type));
1333    if (qualityFindings.length > 0) {
1334      pageLevelFindings.push(...qualityFindings);
1335      addBrowserFindings(groupMap, document.body, qualityFindings);
1336    }
1337 
1338    const creamFindings = checkCreamPalette(document)
1339      .map(f => ({ type: f.id, detail: f.snippet }))
1340      .filter(f => _ruleOk(f.type));
1341    if (creamFindings.length > 0) {
1342      pageLevelFindings.push(...creamFindings);
1343      addBrowserFindings(groupMap, document.body, creamFindings);
1344    }
1345 
1346    // Regex-on-HTML checks (shared with Node)
1347    // Clone the document and strip impeccable-live overlay nodes before the
1348    // regex scan, so the inspector's own inline styles (transitions on top/
1349    // left/width/height, etc.) don't register as page anti-patterns.
1350    const docClone = document.documentElement.cloneNode(true);
1351    for (const node of docClone.querySelectorAll('[id^="impeccable-live-"]')) {
1352      node.remove();
1353    }
1354    const htmlPatternFindings = checkHtmlPatterns(docClone.outerHTML);
1355    if (htmlPatternFindings.length > 0) {
1356      const mapped = htmlPatternFindings.map(f => ({ type: f.id, detail: f.snippet })).filter(f => _ruleOk(f.type));
1357      pageLevelFindings.push(...mapped);
1358      addBrowserFindings(groupMap, document.body, mapped);
1359    }
1360 
1361    return {
1362      groupMap,
1363      allFindings: browserFindingsFromMap(groupMap),
1364      pageLevelFindings,
1365    };
1366  }
1367 
1368  function shouldRunVisualContrast(options = {}) {
1369    return options.visualContrast === true || window.__IMPECCABLE_CONFIG__?.visualContrast === true;
1370  }
1371 
1372  function visualContrastOptions(options = {}) {
1373    const config = window.__IMPECCABLE_CONFIG__ || {};
1374    const scrollOffscreen = typeof options.scrollOffscreen === 'boolean'
1375      ? options.scrollOffscreen
1376      : typeof options.visualContrastScrollOffscreen === 'boolean'
1377        ? options.visualContrastScrollOffscreen
1378        : typeof config.visualContrastScrollOffscreen === 'boolean'
1379          ? config.visualContrastScrollOffscreen
1380          : false;
1381    return {
1382      ...options,
1383      maxCandidates: Number.isFinite(options.visualContrastMaxCandidates)
1384        ? options.visualContrastMaxCandidates
1385        : Number.isFinite(options.maxCandidates)
1386          ? options.maxCandidates
1387          : Number.isFinite(config.visualContrastMaxCandidates)
1388            ? config.visualContrastMaxCandidates
1389            : undefined,
1390      scrollOffscreen,
1391    };
1392  }
1393 
1394  let lastVisualContrastAnalyses = [];
1395  let lazyVisualContrastObserver = null;
1396  let lazyVisualContrastPending = new WeakMap();
1397  const lazyVisualContrastResolving = new WeakSet();
1398  let scanGeneration = 0;
1399 
1400  function rememberVisualContrastAnalysis(result) {
1401    if (!result?.selector) {
1402      lastVisualContrastAnalyses.push(result);
1403      return;
1404    }
1405    const idx = lastVisualContrastAnalyses.findIndex(item => item.selector === result.selector);
1406    if (idx >= 0) lastVisualContrastAnalyses[idx] = result;
1407    else lastVisualContrastAnalyses.push(result);
1408  }
1409 
1410  function disconnectLazyVisualContrastObserver() {
1411    if (lazyVisualContrastObserver) {
1412      lazyVisualContrastObserver.disconnect();
1413      lazyVisualContrastObserver = null;
1414    }
1415    lazyVisualContrastPending = new WeakMap();
1416  }
1417 
1418  function addVisualContrastResult(groupMap, result, options = {}) {
1419    if (result.status !== 'fail' || !result.finding || !result.selector) return false;
1420    let el = null;
1421    try {
1422      el = document.querySelector(result.selector);
1423    } catch {
1424      el = null;
1425    }
1426    if (!el) return false;
1427    const findingType = result.finding.type || result.finding.id || 'low-contrast';
1428    const existing = groupMap.get(el) || [];
1429    if (existing.some(f => (f.type || f.id) === findingType)) return false;
1430    addBrowserFindings(groupMap, el, [{
1431      type: findingType,
1432      detail: result.finding.detail || result.finding.snippet,
1433    }]);
1434    if (options.decorate && el !== document.body && el !== document.documentElement) {
1435      highlight(el, groupMap.get(el) || []);
1436    }
1437    return true;
1438  }
1439 
1440  function scanResultMeta(options = {}) {
1441    const scanId = options.scanId;
1442    if (typeof scanId !== 'string' && typeof scanId !== 'number') return {};
1443    return { scanId: String(scanId) };
1444  }
1445 
1446  function postSerializedFindings(groupMap, options = {}) {
1447    if (!EXTENSION_MODE) return;
1448    const allFindings = browserFindingsFromMap(groupMap);
1449    window.postMessage({
1450      source: 'impeccable-results',
1451      findings: serializeFindings(allFindings),
1452      count: allFindings.length,
1453      ...scanResultMeta(options),
1454    }, '*');
1455  }
1456 
1457  function postExtensionError(err) {
1458    if (!EXTENSION_MODE) return;
1459    window.postMessage({
1460      source: 'impeccable-error',
1461      message: err?.message || String(err),
1462    }, '*');
1463  }
1464 
1465  function reportVisualContrastError(err, detail = {}) {
1466    window.dispatchEvent(new CustomEvent('impeccable-visual-contrast-error', {
1467      detail: {
1468        ...detail,
1469        message: err?.message || String(err),
1470      },
1471    }));
1472    if (EXTENSION_MODE) {
1473      postExtensionError(err);
1474    } else {
1475      console.warn('[impeccable] visual contrast scan failed', err);
1476    }
1477  }
1478 
1479  function scheduleLazyVisualContrast(groupMap, analyses, options = {}, runtime = {}) {
1480    disconnectLazyVisualContrastObserver();
1481    if (options.visualContrastLazy === false || options.scrollOffscreen !== false) return;
1482    if (typeof IntersectionObserver === 'undefined') return;
1483    const unresolved = (analyses || []).filter(result =>
1484      result?.status === 'unresolved' &&
1485      result.reason === 'text outside viewport' &&
1486      result.selector
1487    );
1488    if (unresolved.length === 0) return;
1489    const generation = runtime.generation || scanGeneration;
1490 
1491    lazyVisualContrastObserver = new IntersectionObserver((entries) => {
1492      for (const entry of entries) {
1493        if (!entry.isIntersecting) continue;
1494        const el = entry.target;
1495        const candidate = lazyVisualContrastPending.get(el);
1496        if (!candidate || lazyVisualContrastResolving.has(el)) continue;
1497        lazyVisualContrastObserver?.unobserve(el);
1498        lazyVisualContrastPending.delete(el);
1499        lazyVisualContrastResolving.add(el);
1500        waitForVisualPaint()
1501          .then(() => analyzeVisualContrastCandidate(candidate))
1502          .then(result => {
1503            if (generation !== scanGeneration) return;
1504            rememberVisualContrastAnalysis(result);
1505            const added = addVisualContrastResult(groupMap, result, { decorate: true });
1506            if (added) {
1507              postSerializedFindings(groupMap, options);
1508              window.dispatchEvent(new CustomEvent('impeccable-visual-contrast-resolved', {
1509                detail: {
1510                  selector: result.selector,
1511                  status: result.status,
1512                  finding: result.finding || null,
1513                },
1514              }));
1515            }
1516          })
1517          .catch(err => {
1518            reportVisualContrastError(err, { selector: candidate.selector });
1519          })
1520          .finally(() => {
1521            lazyVisualContrastResolving.delete(el);
1522          });
1523      }
1524    }, { threshold: 0.5 });
1525 
1526    for (const candidate of unresolved) {
1527      let el = null;
1528      try {
1529        el = document.querySelector(candidate.selector);
1530      } catch {
1531        el = null;
1532      }
1533      if (!el) continue;
1534      lazyVisualContrastPending.set(el, candidate);
1535      lazyVisualContrastObserver.observe(el);
1536    }
1537  }
1538 
1539  async function addVisualContrastFindings(groupMap, options = {}, runtime = {}) {
1540    if (!shouldRunVisualContrast(options)) {
1541      lastVisualContrastAnalyses = [];
1542      disconnectLazyVisualContrastObserver();
1543      return [];
1544    }
1545    const resolvedOptions = visualContrastOptions(options);
1546    const analyses = await analyzeVisualContrast(resolvedOptions);
1547    if (runtime.generation && runtime.generation !== scanGeneration) return analyses;
1548    lastVisualContrastAnalyses = analyses;
1549    for (const result of analyses) {
1550      addVisualContrastResult(groupMap, result, { decorate: runtime.decorate });
1551    }
1552    if (runtime.decorate || runtime.scheduleLazy) scheduleLazyVisualContrast(groupMap, analyses, resolvedOptions, runtime);
1553    return analyses;
1554  }
1555 
1556  async function collectBrowserFindingsAsync(options = {}, runtime = {}) {
1557    const collected = collectBrowserFindings();
1558    await addVisualContrastFindings(collected.groupMap, options, runtime);
1559    return {
1560      ...collected,
1561      allFindings: browserFindingsFromMap(collected.groupMap),
1562      visualContrastAnalyses: lastVisualContrastAnalyses,
1563    };
1564  }
1565 
1566  function clearOverlays() {
1567    scanGeneration += 1;
1568    disconnectLazyVisualContrastObserver();
1569    for (const o of [...overlays]) detachOverlay(o);
1570    overlays.length = 0;
1571    visibilityObserver.disconnect();
1572    overlayIndex = 0;
1573  }
1574 
1575  function renderBrowserFindings(collected, options = {}) {
1576    const { allFindings, pageLevelFindings } = collected;
1577 
1578    for (const { el, findings } of allFindings) {
1579      if (el === document.body || el === document.documentElement) continue;
1580      highlight(el, findings);
1581    }
1582 
1583    if (pageLevelFindings.length > 0) {
1584      showPageBanner(pageLevelFindings);
1585    }
1586 
1587    if (!EXTENSION_MODE) printSummary(allFindings);
1588 
1589    // In extension mode, post serialized results for the DevTools panel
1590    if (EXTENSION_MODE) {
1591      window.postMessage({
1592        source: 'impeccable-results',
1593        findings: serializeFindings(allFindings),
1594        count: allFindings.length,
1595        ...scanResultMeta(options),
1596      }, '*');
1597    }
1598 
1599    // After this scan completes, all subsequent reveals are instant (no stagger, no animation)
1600    setTimeout(() => { firstScanDone = true; }, 1000);
1601 
1602    return allFindings;
1603  }
1604 
1605  let firstScanDone = false;
1606  const scan = function(options = {}) {
1607    clearOverlays();
1608    const generation = scanGeneration;
1609    const collected = collectBrowserFindings();
1610    const allFindings = renderBrowserFindings(collected, options);
1611    if (shouldRunVisualContrast(options)) {
1612      addVisualContrastFindings(collected.groupMap, options, { decorate: true, generation })
1613        .then(() => {
1614          if (generation === scanGeneration) postSerializedFindings(collected.groupMap, options);
1615        })
1616        .catch(err => {
1617          reportVisualContrastError(err);
1618        });
1619    }
1620    return allFindings;
1621  };
1622 
1623  const scanAsync = async function(options = {}) {
1624    clearOverlays();
1625    const generation = scanGeneration;
1626    if (shouldRunVisualContrast(options)) {
1627      const collected = await collectBrowserFindingsAsync(options, { generation, scheduleLazy: true });
1628      if (generation !== scanGeneration) return [];
1629      return renderBrowserFindings(collected, options);
1630    }
1631    lastVisualContrastAnalyses = [];
1632    return renderBrowserFindings(collectBrowserFindings(), options);
1633  };
1634 
1635  const detect = function(options = {}) {
1636    lastVisualContrastAnalyses = [];
1637    const { allFindings } = collectBrowserFindings();
1638    return options.serialize === false ? allFindings : serializeFindings(allFindings);
1639  };
1640 
1641  const detectAsync = async function(options = {}) {
1642    if (shouldRunVisualContrast(options)) {
1643      const { allFindings } = await collectBrowserFindingsAsync(options);
1644      return options.serialize === false ? allFindings : serializeFindings(allFindings);
1645    }
1646    lastVisualContrastAnalyses = [];
1647    const { allFindings } = collectBrowserFindings();
1648    return options.serialize === false ? allFindings : serializeFindings(allFindings);
1649  };
1650 
1651  if (EXTENSION_MODE) {
1652    // Extension mode: listen for commands, don't auto-scan
1653    window.addEventListener('message', (e) => {
1654      if (e.source !== window || !e.data || e.data.source !== 'impeccable-command') return;
1655      if (e.data.action === 'scan') {
1656        if (e.data.config) window.__IMPECCABLE_CONFIG__ = e.data.config;
1657        try {
1658          scan(e.data.config || {});
1659        } catch (err) {
1660          postExtensionError(err);
1661        }
1662      }
1663      if (e.data.action === 'toggle-overlays') {
1664        const visible = !document.body.classList.contains('impeccable-hidden');
1665        document.body.classList.toggle('impeccable-hidden', visible);
1666        window.postMessage({ source: 'impeccable-overlays-toggled', visible: !visible }, '*');
1667      }
1668      if (e.data.action === 'remove') {
1669        clearOverlays();
1670        styleEl.remove();
1671        if (spotlightBackdrop) { spotlightBackdrop.remove(); spotlightBackdrop = null; }
1672        document.body.classList.remove('impeccable-hidden');
1673      }
1674      if (e.data.action === 'highlight') {
1675        try {
1676          const target = e.data.selector ? document.querySelector(e.data.selector) : null;
1677          if (target) {
1678            // Scroll first so positionOverlay reads the post-scroll rect
1679            if (!isInViewport(target) && target.scrollIntoView) {
1680              target.scrollIntoView({ behavior: 'instant', block: 'center' });
1681            }
1682            for (const o of overlays) {
1683              if (o.classList.contains('impeccable-banner')) continue;
1684              const isMatch = o._targetEl === target;
1685              o.classList.toggle('impeccable-spotlight', isMatch);
1686              o.classList.toggle('impeccable-spotlight-dimmed', !isMatch);
1687              if (isMatch) {
1688                // Force the matching overlay visible immediately, don't wait for IntersectionObserver
1689                o.style.display = '';
1690                o.style.animation = 'none';
1691                o.classList.add('impeccable-visible');
1692                o._revealed = true;
1693                positionOverlay(o);
1694              }
1695            }
1696            showSpotlight(target);
1697          }
1698        } catch { /* invalid selector */ }
1699      }
1700      if (e.data.action === 'unhighlight') {
1701        hideSpotlight();
1702        for (const o of overlays) {
1703          o.classList.remove('impeccable-spotlight');
1704          o.classList.remove('impeccable-spotlight-dimmed');
1705        }
1706      }
1707    });
1708    window.postMessage({ source: 'impeccable-ready' }, '*');
1709  } else {
1710    if (window.__IMPECCABLE_CONFIG__?.autoScan !== false) {
1711      const runAutoScan = () => {
1712        try {
1713          scan();
1714        } catch (err) {
1715          console.warn('[impeccable] scan failed', err);
1716        }
1717      };
1718      if (document.readyState === 'loading') {
1719        document.addEventListener('DOMContentLoaded', () => setTimeout(runAutoScan, 100));
1720      } else {
1721        setTimeout(runAutoScan, 100);
1722      }
1723    }
1724  }
1725 
1726  window.impeccableDetect = detect;
1727  window.impeccableDetectAsync = detectAsync;
1728  window.impeccableScan = scan;
1729  window.impeccableScanAsync = scanAsync;
1730  window.impeccableCollectVisualContrastCandidates = collectVisualContrastCandidates;
1731  window.impeccableAnalyzeVisualContrast = analyzeVisualContrast;
1732  window.impeccableGetLastVisualContrastAnalyses = () => lastVisualContrastAnalyses.slice();
1733}
1734