Upload extractor.py

agents/extractor.py

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+"""
+Agent 1: Token Extractor
+Design System Extractor v2
+
+Persona: Meticulous Design Archaeologist
+
+Responsibilities:
+- Crawl pages at specified viewport
+- Extract computed styles from all elements
+- Parse CSS files for variables and rules
+- Extract colors from SVGs
+- Collect colors, typography, spacing, radius, shadows
+- Track frequency and context for each token
+"""
+
+import asyncio
+import re
+from typing import Optional, Callable
+from datetime import datetime
+from collections import defaultdict
+
+from playwright.async_api import async_playwright, Browser, Page, BrowserContext
+
+from core.token_schema import (
+    Viewport,
+    ExtractedTokens,
+    ColorToken,
+    TypographyToken,
+    SpacingToken,
+    RadiusToken,
+    ShadowToken,
+    FontFamily,
+    TokenSource,
+    Confidence,
+)
+from core.color_utils import (
+    normalize_hex,
+    parse_color,
+    get_contrast_with_white,
+    get_contrast_with_black,
+    check_wcag_compliance,
+)
+from config.settings import get_settings
+
+
+class TokenExtractor:
+    """
+    Extracts design tokens from web pages.
+    
+    This is the second part of Agent 1's job — after pages are confirmed,
+    we crawl and extract all CSS values.
+    
+    Enhanced with:
+    - CSS file parsing for variables and rules
+    - SVG color extraction
+    - Inline style extraction
+    """
+    
+    def __init__(self, viewport: Viewport = Viewport.DESKTOP):
+        self.settings = get_settings()
+        self.viewport = viewport
+        self.browser: Optional[Browser] = None
+        self.context: Optional[BrowserContext] = None
+        
+        # Token collection
+        self.colors: dict[str, ColorToken] = {}
+        self.typography: dict[str, TypographyToken] = {}
+        self.spacing: dict[str, SpacingToken] = {}
+        self.radius: dict[str, RadiusToken] = {}
+        self.shadows: dict[str, ShadowToken] = {}
+        
+        # CSS Variables collection
+        self.css_variables: dict[str, str] = {}
+        
+        # Font tracking
+        self.font_families: dict[str, FontFamily] = {}
+        
+        # Statistics
+        self.total_elements = 0
+        self.errors: list[str] = []
+        self.warnings: list[str] = []
+    
+    async def __aenter__(self):
+        """Async context manager entry."""
+        await self._init_browser()
+        return self
+    
+    async def __aexit__(self, exc_type, exc_val, exc_tb):
+        """Async context manager exit."""
+        await self._close_browser()
+    
+    async def _init_browser(self):
+        """Initialize Playwright browser."""
+        playwright = await async_playwright().start()
+        self.browser = await playwright.chromium.launch(
+            headless=self.settings.browser.headless
+        )
+        
+        # Set viewport based on extraction mode
+        if self.viewport == Viewport.DESKTOP:
+            width = self.settings.viewport.desktop_width
+            height = self.settings.viewport.desktop_height
+        else:
+            width = self.settings.viewport.mobile_width
+            height = self.settings.viewport.mobile_height
+        
+        self.context = await self.browser.new_context(
+            viewport={"width": width, "height": height},
+            user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36"
+        )
+    
+    async def _close_browser(self):
+        """Close browser and cleanup."""
+        if self.context:
+            await self.context.close()
+        if self.browser:
+            await self.browser.close()
+    
+    async def _scroll_page(self, page: Page):
+        """Scroll page to load lazy content."""
+        await page.evaluate("""
+            async () => {
+                const delay = ms => new Promise(resolve => setTimeout(resolve, ms));
+                const height = document.body.scrollHeight;
+                const step = window.innerHeight;
+                
+                for (let y = 0; y < height; y += step) {
+                    window.scrollTo(0, y);
+                    await delay(100);
+                }
+                
+                // Scroll back to top
+                window.scrollTo(0, 0);
+            }
+        """)
+        
+        # Wait for network idle after scrolling
+        await page.wait_for_load_state("networkidle", timeout=self.settings.browser.network_idle_timeout)
+    
+    async def _extract_styles_from_page(self, page: Page) -> dict:
+        """
+        Extract computed styles from all elements on the page.
+        
+        This is the core extraction logic — we get getComputedStyle for every element.
+        """
+        styles_data = await page.evaluate("""
+            () => {
+                const elements = document.querySelectorAll('*');
+                const results = {
+                    colors: [],
+                    typography: [],
+                    spacing: [],
+                    radius: [],
+                    shadows: [],
+                    elements_count: elements.length,
+                };
+                
+                const colorProperties = [
+                    'color', 'background-color', 'border-color',
+                    'border-top-color', 'border-right-color', 
+                    'border-bottom-color', 'border-left-color',
+                    'outline-color', 'text-decoration-color',
+                ];
+                
+                const spacingProperties = [
+                    'margin-top', 'margin-right', 'margin-bottom', 'margin-left',
+                    'padding-top', 'padding-right', 'padding-bottom', 'padding-left',
+                    'gap', 'row-gap', 'column-gap',
+                ];
+                
+                elements.forEach(el => {
+                    const tag = el.tagName.toLowerCase();
+                    const styles = window.getComputedStyle(el);
+                    
+                    // Skip invisible elements
+                    if (styles.display === 'none' || styles.visibility === 'hidden') {
+                        return;
+                    }
+                    
+                    // --- COLORS ---
+                    colorProperties.forEach(prop => {
+                        const value = styles.getPropertyValue(prop);
+                        if (value && value !== 'rgba(0, 0, 0, 0)' && value !== 'transparent') {
+                            results.colors.push({
+                                value: value,
+                                property: prop,
+                                element: tag,
+                                context: prop.includes('background') ? 'background' : 
+                                        prop.includes('border') ? 'border' : 'text',
+                            });
+                        }
+                    });
+                    
+                    // --- TYPOGRAPHY ---
+                    const fontFamily = styles.getPropertyValue('font-family');
+                    const fontSize = styles.getPropertyValue('font-size');
+                    const fontWeight = styles.getPropertyValue('font-weight');
+                    const lineHeight = styles.getPropertyValue('line-height');
+                    const letterSpacing = styles.getPropertyValue('letter-spacing');
+                    
+                    if (fontSize && fontFamily) {
+                        results.typography.push({
+                            fontFamily: fontFamily,
+                            fontSize: fontSize,
+                            fontWeight: fontWeight,
+                            lineHeight: lineHeight,
+                            letterSpacing: letterSpacing,
+                            element: tag,
+                        });
+                    }
+                    
+                    // --- SPACING ---
+                    spacingProperties.forEach(prop => {
+                        const value = styles.getPropertyValue(prop);
+                        if (value && value !== '0px' && value !== 'auto' && value !== 'normal') {
+                            const px = parseFloat(value);
+                            if (!isNaN(px) && px > 0 && px < 500) {
+                                results.spacing.push({
+                                    value: value,
+                                    valuePx: Math.round(px),
+                                    property: prop,
+                                    context: prop.includes('margin') ? 'margin' : 
+                                            prop.includes('padding') ? 'padding' : 'gap',
+                                });
+                            }
+                        }
+                    });
+                    
+                    // --- BORDER RADIUS ---
+                    const radiusProps = [
+                        'border-radius', 'border-top-left-radius', 
+                        'border-top-right-radius', 'border-bottom-left-radius',
+                        'border-bottom-right-radius',
+                    ];
+                    
+                    radiusProps.forEach(prop => {
+                        const value = styles.getPropertyValue(prop);
+                        if (value && value !== '0px') {
+                            results.radius.push({
+                                value: value,
+                                element: tag,
+                            });
+                        }
+                    });
+                    
+                    // --- BOX SHADOW ---
+                    const shadow = styles.getPropertyValue('box-shadow');
+                    if (shadow && shadow !== 'none') {
+                        results.shadows.push({
+                            value: shadow,
+                            element: tag,
+                        });
+                    }
+                });
+                
+                return results;
+            }
+        """)
+        
+        return styles_data
+    
+    async def _extract_css_variables(self, page: Page) -> dict:
+        """
+        Extract CSS custom properties (variables) from :root and stylesheets.
+        
+        This catches colors defined as:
+        - :root { --primary-color: #3860be; }
+        - :root { --brand-cyan: #00c4cc; }
+        """
+        css_vars = await page.evaluate("""
+            () => {
+                const variables = {};
+                
+                // 1. Get CSS variables from :root computed styles
+                const rootStyles = getComputedStyle(document.documentElement);
+                const rootCss = document.documentElement.style.cssText;
+                
+                // 2. Parse all stylesheets for CSS variables
+                for (const sheet of document.styleSheets) {
+                    try {
+                        const rules = sheet.cssRules || sheet.rules;
+                        for (const rule of rules) {
+                            if (rule.style) {
+                                for (let i = 0; i < rule.style.length; i++) {
+                                    const prop = rule.style[i];
+                                    if (prop.startsWith('--')) {
+                                        const value = rule.style.getPropertyValue(prop).trim();
+                                        if (value) {
+                                            variables[prop] = value;
+                                        }
+                                    }
+                                }
+                            }
+                            // Also check @media rules
+                            if (rule.cssRules) {
+                                for (const innerRule of rule.cssRules) {
+                                    if (innerRule.style) {
+                                        for (let i = 0; i < innerRule.style.length; i++) {
+                                            const prop = innerRule.style[i];
+                                            if (prop.startsWith('--')) {
+                                                const value = innerRule.style.getPropertyValue(prop).trim();
+                                                if (value) {
+                                                    variables[prop] = value;
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    } catch (e) {
+                        // CORS may block access to external stylesheets
+                        console.log('Could not access stylesheet:', e);
+                    }
+                }
+                
+                // 3. Get computed CSS variable values from :root
+                const computedVars = {};
+                for (const prop of Object.keys(variables)) {
+                    const computed = rootStyles.getPropertyValue(prop).trim();
+                    if (computed) {
+                        computedVars[prop] = computed;
+                    }
+                }
+                
+                return { raw: variables, computed: computedVars };
+            }
+        """)
+        
+        return css_vars
+    
+    async def _extract_svg_colors(self, page: Page) -> list[dict]:
+        """
+        Extract colors from SVG elements (fill, stroke).
+        
+        This catches colors in:
+        - <svg fill="#00c4cc">
+        - <path stroke="#3860be">
+        - <circle fill="rgb(188, 212, 50)">
+        """
+        svg_colors = await page.evaluate("""
+            () => {
+                const colors = [];
+                
+                // Find all SVG elements
+                const svgs = document.querySelectorAll('svg, svg *');
+                
+                svgs.forEach(el => {
+                    // Check fill attribute
+                    const fill = el.getAttribute('fill');
+                    if (fill && fill !== 'none' && fill !== 'currentColor' && !fill.startsWith('url(')) {
+                        colors.push({
+                            value: fill,
+                            property: 'svg-fill',
+                            element: el.tagName.toLowerCase(),
+                            context: 'svg',
+                        });
+                    }
+                    
+                    // Check stroke attribute
+                    const stroke = el.getAttribute('stroke');
+                    if (stroke && stroke !== 'none' && stroke !== 'currentColor' && !stroke.startsWith('url(')) {
+                        colors.push({
+                            value: stroke,
+                            property: 'svg-stroke',
+                            element: el.tagName.toLowerCase(),
+                            context: 'svg',
+                        });
+                    }
+                    
+                    // Check computed styles for SVG elements
+                    const styles = getComputedStyle(el);
+                    const computedFill = styles.fill;
+                    const computedStroke = styles.stroke;
+                    
+                    if (computedFill && computedFill !== 'none' && !computedFill.startsWith('url(')) {
+                        colors.push({
+                            value: computedFill,
+                            property: 'svg-fill-computed',
+                            element: el.tagName.toLowerCase(),
+                            context: 'svg',
+                        });
+                    }
+                    
+                    if (computedStroke && computedStroke !== 'none' && !computedStroke.startsWith('url(')) {
+                        colors.push({
+                            value: computedStroke,
+                            property: 'svg-stroke-computed',
+                            element: el.tagName.toLowerCase(),
+                            context: 'svg',
+                        });
+                    }
+                });
+                
+                return colors;
+            }
+        """)
+        
+        return svg_colors
+    
+    async def _extract_inline_styles(self, page: Page) -> dict:
+        """
+        Extract colors from inline style attributes.
+        
+        This catches colors in:
+        - <div style="background-color: #bcd432;">
+        - <span style="color: rgb(0, 196, 204);">
+        """
+        inline_data = await page.evaluate("""
+            () => {
+                const colors = [];
+                const colorRegex = /#[0-9a-fA-F]{3,8}|rgb\\([^)]+\\)|rgba\\([^)]+\\)|hsl\\([^)]+\\)|hsla\\([^)]+\\)/gi;
+                
+                // Find all elements with inline styles
+                const elements = document.querySelectorAll('[style]');
+                
+                elements.forEach(el => {
+                    const styleAttr = el.getAttribute('style');
+                    if (styleAttr) {
+                        const matches = styleAttr.match(colorRegex);
+                        if (matches) {
+                            matches.forEach(color => {
+                                colors.push({
+                                    value: color,
+                                    property: 'inline-style',
+                                    element: el.tagName.toLowerCase(),
+                                    context: 'inline',
+                                });
+                            });
+                        }
+                    }
+                });
+                
+                return colors;
+            }
+        """)
+        
+        return inline_data
+    
+    async def _extract_stylesheet_colors(self, page: Page) -> list[dict]:
+        """
+        Parse CSS stylesheets for color values.
+        
+        This catches colors defined in CSS rules that may not be
+        currently applied to visible elements.
+        """
+        css_colors = await page.evaluate("""
+            () => {
+                const colors = [];
+                const colorRegex = /#[0-9a-fA-F]{3,8}|rgb\\([^)]+\\)|rgba\\([^)]+\\)|hsl\\([^)]+\\)|hsla\\([^)]+\\)/gi;
+                
+                // Color-related CSS properties
+                const colorProps = [
+                    'color', 'background-color', 'background', 'border-color',
+                    'border-top-color', 'border-right-color', 'border-bottom-color', 'border-left-color',
+                    'outline-color', 'box-shadow', 'text-shadow', 'fill', 'stroke',
+                    'caret-color', 'column-rule-color', 'text-decoration-color',
+                ];
+                
+                // Parse all stylesheets
+                for (const sheet of document.styleSheets) {
+                    try {
+                        const rules = sheet.cssRules || sheet.rules;
+                        for (const rule of rules) {
+                            if (rule.style) {
+                                colorProps.forEach(prop => {
+                                    const value = rule.style.getPropertyValue(prop);
+                                    if (value) {
+                                        const matches = value.match(colorRegex);
+                                        if (matches) {
+                                            matches.forEach(color => {
+                                                colors.push({
+                                                    value: color,
+                                                    property: prop,
+                                                    element: 'css-rule',
+                                                    context: 'stylesheet',
+                                                    selector: rule.selectorText || '',
+                                                });
+                                            });
+                                        }
+                                    }
+                                });
+                            }
+                        }
+                    } catch (e) {
+                        // CORS may block access to external stylesheets
+                    }
+                }
+                
+                return colors;
+            }
+        """)
+        
+        return css_colors
+    
+    def _process_css_variables(self, css_vars: dict):
+        """Process CSS variables and extract color tokens from them."""
+        computed = css_vars.get("computed", {})
+        raw = css_vars.get("raw", {})
+        
+        # Store CSS variables
+        self.css_variables = {**raw, **computed}
+        
+        # Extract colors from CSS variables
+        color_regex = re.compile(r'#[0-9a-fA-F]{3,8}|rgb\([^)]+\)|rgba\([^)]+\)|hsl\([^)]+\)|hsla\([^)]+\)', re.IGNORECASE)
+        
+        for var_name, value in computed.items():
+            if color_regex.match(value.strip()):
+                # This is a color variable
+                color_data = {
+                    "value": value.strip(),
+                    "property": var_name,
+                    "element": ":root",
+                    "context": "css-variable",
+                }
+                
+                hex_value = self._process_color(color_data)
+                if hex_value and hex_value not in self.colors:
+                    contrast_white = get_contrast_with_white(hex_value)
+                    contrast_black = get_contrast_with_black(hex_value)
+                    compliance = check_wcag_compliance(hex_value, "#ffffff")
+                    
+                    self.colors[hex_value] = ColorToken(
+                        value=hex_value,
+                        frequency=1,
+                        contexts=["css-variable"],
+                        elements=[":root"],
+                        css_properties=[var_name],
+                        contrast_white=round(contrast_white, 2),
+                        contrast_black=round(contrast_black, 2),
+                        wcag_aa_large_text=compliance["aa_large_text"],
+                        wcag_aa_small_text=compliance["aa_normal_text"],
+                        source=TokenSource.CSS_VARIABLE,
+                        confidence=Confidence.HIGH,
+                    )
+                elif hex_value and hex_value in self.colors:
+                    # Update existing token
+                    token = self.colors[hex_value]
+                    token.frequency += 1
+                    if "css-variable" not in token.contexts:
+                        token.contexts.append("css-variable")
+                    if var_name not in token.css_properties:
+                        token.css_properties.append(var_name)
+
+    def _process_color(self, color_data: dict) -> Optional[str]:
+        """Process and normalize a color value."""
+        value = color_data.get("value", "")
+        
+        # Parse and normalize
+        parsed = parse_color(value)
+        if not parsed:
+            return None
+        
+        return parsed.hex
+    
+    def _aggregate_colors(self, raw_colors: list[dict]):
+        """Aggregate color data from extraction."""
+        for color_data in raw_colors:
+            hex_value = self._process_color(color_data)
+            if not hex_value:
+                continue
+            
+            if hex_value not in self.colors:
+                # Calculate contrast ratios
+                contrast_white = get_contrast_with_white(hex_value)
+                contrast_black = get_contrast_with_black(hex_value)
+                compliance = check_wcag_compliance(hex_value, "#ffffff")
+                
+                self.colors[hex_value] = ColorToken(
+                    value=hex_value,
+                    frequency=0,
+                    contexts=[],
+                    elements=[],
+                    css_properties=[],
+                    contrast_white=round(contrast_white, 2),
+                    contrast_black=round(contrast_black, 2),
+                    wcag_aa_large_text=compliance["aa_large_text"],
+                    wcag_aa_small_text=compliance["aa_normal_text"],
+                )
+            
+            # Update frequency and context
+            token = self.colors[hex_value]
+            token.frequency += 1
+            
+            context = color_data.get("context", "")
+            if context and context not in token.contexts:
+                token.contexts.append(context)
+            
+            element = color_data.get("element", "")
+            if element and element not in token.elements:
+                token.elements.append(element)
+            
+            prop = color_data.get("property", "")
+            if prop and prop not in token.css_properties:
+                token.css_properties.append(prop)
+    
+    def _aggregate_typography(self, raw_typography: list[dict]):
+        """Aggregate typography data from extraction."""
+        for typo_data in raw_typography:
+            # Create unique key
+            font_family = typo_data.get("fontFamily", "")
+            font_size = typo_data.get("fontSize", "")
+            font_weight = typo_data.get("fontWeight", "400")
+            line_height = typo_data.get("lineHeight", "normal")
+            
+            key = f"{font_size}|{font_weight}|{font_family[:50]}"
+            
+            if key not in self.typography:
+                # Parse font size to px
+                font_size_px = None
+                if font_size.endswith("px"):
+                    try:
+                        font_size_px = float(font_size.replace("px", ""))
+                    except ValueError:
+                        pass
+                
+                # Parse line height
+                line_height_computed = None
+                if line_height and line_height != "normal":
+                    if line_height.endswith("px") and font_size_px:
+                        try:
+                            lh_px = float(line_height.replace("px", ""))
+                            line_height_computed = round(lh_px / font_size_px, 2)
+                        except ValueError:
+                            pass
+                    else:
+                        try:
+                            line_height_computed = float(line_height)
+                        except ValueError:
+                            pass
+                
+                self.typography[key] = TypographyToken(
+                    font_family=font_family.split(",")[0].strip().strip('"\''),
+                    font_size=font_size,
+                    font_size_px=font_size_px,
+                    font_weight=int(font_weight) if font_weight.isdigit() else 400,
+                    line_height=line_height,
+                    line_height_computed=line_height_computed,
+                    letter_spacing=typo_data.get("letterSpacing"),
+                    frequency=0,
+                    elements=[],
+                )
+            
+            # Update
+            token = self.typography[key]
+            token.frequency += 1
+            
+            element = typo_data.get("element", "")
+            if element and element not in token.elements:
+                token.elements.append(element)
+            
+            # Track font families
+            primary_font = token.font_family
+            if primary_font not in self.font_families:
+                self.font_families[primary_font] = FontFamily(
+                    name=primary_font,
+                    fallbacks=[f.strip().strip('"\'') for f in font_family.split(",")[1:]],
+                    frequency=0,
+                )
+            self.font_families[primary_font].frequency += 1
+    
+    def _aggregate_spacing(self, raw_spacing: list[dict]):
+        """Aggregate spacing data from extraction."""
+        for space_data in raw_spacing:
+            value = space_data.get("value", "")
+            value_px = space_data.get("valuePx", 0)
+            
+            key = str(value_px)
+            
+            if key not in self.spacing:
+                self.spacing[key] = SpacingToken(
+                    value=f"{value_px}px",
+                    value_px=value_px,
+                    frequency=0,
+                    contexts=[],
+                    properties=[],
+                    fits_base_4=value_px % 4 == 0,
+                    fits_base_8=value_px % 8 == 0,
+                )
+            
+            token = self.spacing[key]
+            token.frequency += 1
+            
+            context = space_data.get("context", "")
+            if context and context not in token.contexts:
+                token.contexts.append(context)
+            
+            prop = space_data.get("property", "")
+            if prop and prop not in token.properties:
+                token.properties.append(prop)
+    
+    def _aggregate_radius(self, raw_radius: list[dict]):
+        """Aggregate border radius data."""
+        for radius_data in raw_radius:
+            value = radius_data.get("value", "")
+            
+            # Normalize to simple format
+            # "8px 8px 8px 8px" -> "8px"
+            parts = value.split()
+            if len(set(parts)) == 1:
+                value = parts[0]
+            
+            if value not in self.radius:
+                value_px = None
+                if value.endswith("px"):
+                    try:
+                        value_px = int(float(value.replace("px", "")))
+                    except ValueError:
+                        pass
+                
+                self.radius[value] = RadiusToken(
+                    value=value,
+                    value_px=value_px,
+                    frequency=0,
+                    elements=[],
+                    fits_base_4=value_px % 4 == 0 if value_px else False,
+                    fits_base_8=value_px % 8 == 0 if value_px else False,
+                )
+            
+            token = self.radius[value]
+            token.frequency += 1
+            
+            element = radius_data.get("element", "")
+            if element and element not in token.elements:
+                token.elements.append(element)
+    
+    def _aggregate_shadows(self, raw_shadows: list[dict]):
+        """Aggregate box shadow data."""
+        for shadow_data in raw_shadows:
+            value = shadow_data.get("value", "")
+            
+            if value not in self.shadows:
+                self.shadows[value] = ShadowToken(
+                    value=value,
+                    frequency=0,
+                    elements=[],
+                )
+            
+            token = self.shadows[value]
+            token.frequency += 1
+            
+            element = shadow_data.get("element", "")
+            if element and element not in token.elements:
+                token.elements.append(element)
+    
+    def _calculate_confidence(self, frequency: int) -> Confidence:
+        """Calculate confidence level based on frequency."""
+        if frequency >= 10:
+            return Confidence.HIGH
+        elif frequency >= 3:
+            return Confidence.MEDIUM
+        return Confidence.LOW
+    
+    def _detect_spacing_base(self) -> Optional[int]:
+        """Detect the base spacing unit (4 or 8)."""
+        fits_4 = sum(1 for s in self.spacing.values() if s.fits_base_4)
+        fits_8 = sum(1 for s in self.spacing.values() if s.fits_base_8)
+        
+        total = len(self.spacing)
+        if total == 0:
+            return None
+        
+        # If 80%+ values fit base 8, use 8
+        if fits_8 / total >= 0.8:
+            return 8
+        # If 80%+ values fit base 4, use 4
+        elif fits_4 / total >= 0.8:
+            return 4
+        
+        return None
+    
+    async def extract(
+        self,
+        pages: list[str],
+        progress_callback: Optional[Callable[[float], None]] = None
+    ) -> ExtractedTokens:
+        """
+        Extract tokens from a list of pages.
+        
+        Enhanced extraction includes:
+        - DOM computed styles
+        - CSS variables from :root
+        - SVG fill/stroke colors
+        - Inline style colors
+        - Stylesheet color rules
+        
+        Args:
+            pages: List of URLs to crawl
+            progress_callback: Optional callback for progress updates
+        
+        Returns:
+            ExtractedTokens with all discovered tokens
+        """
+        start_time = datetime.now()
+        pages_crawled = []
+        
+        async with self:
+            for i, url in enumerate(pages):
+                try:
+                    page = await self.context.new_page()
+                    
+                    # Navigate with fallback strategy
+                    try:
+                        await page.goto(
+                            url,
+                            wait_until="domcontentloaded",
+                            timeout=60000  # 60 seconds
+                        )
+                        # Wait for JS to render
+                        await page.wait_for_timeout(2000)
+                    except Exception as nav_error:
+                        # Fallback to load event
+                        try:
+                            await page.goto(
+                                url,
+                                wait_until="load",
+                                timeout=60000
+                            )
+                            await page.wait_for_timeout(3000)
+                        except Exception:
+                            self.warnings.append(f"Slow load for {url}, extracting partial content")
+                    
+                    # Scroll to load lazy content
+                    await self._scroll_page(page)
+                    
+                    # =========================================================
+                    # ENHANCED EXTRACTION: Multiple sources
+                    # =========================================================
+                    
+                    # Track counts before extraction for this page
+                    colors_before = len(self.colors)
+                    typo_before = len(self.typography)
+                    spacing_before = len(self.spacing)
+                    radius_before = len(self.radius)
+                    shadows_before = len(self.shadows)
+                    
+                    # 1. Extract DOM computed styles (original method)
+                    styles = await self._extract_styles_from_page(page)
+                    dom_colors = len(styles.get("colors", []))
+                    self._aggregate_colors(styles.get("colors", []))
+                    self._aggregate_typography(styles.get("typography", []))
+                    self._aggregate_spacing(styles.get("spacing", []))
+                    self._aggregate_radius(styles.get("radius", []))
+                    self._aggregate_shadows(styles.get("shadows", []))
+                    
+                    # 2. Extract CSS variables (--primary-color, etc.)
+                    css_var_count = 0
+                    try:
+                        css_vars = await self._extract_css_variables(page)
+                        css_var_count = len(css_vars.get("computed", {}))
+                        self._process_css_variables(css_vars)
+                    except Exception as e:
+                        self.warnings.append(f"CSS variables extraction failed: {str(e)}")
+                    
+                    # 3. Extract SVG colors (fill, stroke)
+                    svg_color_count = 0
+                    try:
+                        svg_colors = await self._extract_svg_colors(page)
+                        svg_color_count = len(svg_colors)
+                        self._aggregate_colors(svg_colors)
+                    except Exception as e:
+                        self.warnings.append(f"SVG color extraction failed: {str(e)}")
+                    
+                    # 4. Extract inline style colors
+                    inline_color_count = 0
+                    try:
+                        inline_colors = await self._extract_inline_styles(page)
+                        inline_color_count = len(inline_colors)
+                        self._aggregate_colors(inline_colors)
+                    except Exception as e:
+                        self.warnings.append(f"Inline style extraction failed: {str(e)}")
+                    
+                    # 5. Extract stylesheet colors (CSS rules)
+                    stylesheet_color_count = 0
+                    try:
+                        stylesheet_colors = await self._extract_stylesheet_colors(page)
+                        stylesheet_color_count = len(stylesheet_colors)
+                        self._aggregate_colors(stylesheet_colors)
+                    except Exception as e:
+                        self.warnings.append(f"Stylesheet color extraction failed: {str(e)}")
+                    
+                    # =========================================================
+                    # Log extraction results for this page
+                    # =========================================================
+                    colors_new = len(self.colors) - colors_before
+                    typo_new = len(self.typography) - typo_before
+                    spacing_new = len(self.spacing) - spacing_before
+                    radius_new = len(self.radius) - radius_before
+                    shadows_new = len(self.shadows) - shadows_before
+                    
+                    # Store extraction stats for logging
+                    self._last_extraction_stats = {
+                        "url": url,
+                        "dom_colors": dom_colors,
+                        "css_variables": css_var_count,
+                        "svg_colors": svg_color_count,
+                        "inline_colors": inline_color_count,
+                        "stylesheet_colors": stylesheet_color_count,
+                        "new_colors": colors_new,
+                        "new_typography": typo_new,
+                        "new_spacing": spacing_new,
+                        "new_radius": radius_new,
+                        "new_shadows": shadows_new,
+                    }
+                    
+                    # =========================================================
+                    
+                    self.total_elements += styles.get("elements_count", 0)
+                    pages_crawled.append(url)
+                    
+                    await page.close()
+                    
+                    # Progress callback
+                    if progress_callback:
+                        progress_callback((i + 1) / len(pages))
+                    
+                    # Rate limiting
+                    await asyncio.sleep(self.settings.crawl.crawl_delay_ms / 1000)
+                    
+                except Exception as e:
+                    self.errors.append(f"Error extracting {url}: {str(e)}")
+        
+        # Calculate confidence for all tokens
+        for token in self.colors.values():
+            token.confidence = self._calculate_confidence(token.frequency)
+        for token in self.typography.values():
+            token.confidence = self._calculate_confidence(token.frequency)
+        for token in self.spacing.values():
+            token.confidence = self._calculate_confidence(token.frequency)
+        
+        # Detect spacing base
+        spacing_base = self._detect_spacing_base()
+        
+        # Mark outliers in spacing
+        if spacing_base:
+            for token in self.spacing.values():
+                if spacing_base == 8 and not token.fits_base_8:
+                    token.is_outlier = True
+                elif spacing_base == 4 and not token.fits_base_4:
+                    token.is_outlier = True
+        
+        # Determine primary font
+        if self.font_families:
+            primary_font = max(self.font_families.values(), key=lambda f: f.frequency)
+            primary_font.usage = "primary"
+        
+        # Build result
+        end_time = datetime.now()
+        duration_ms = int((end_time - start_time).total_seconds() * 1000)
+        
+        return ExtractedTokens(
+            viewport=self.viewport,
+            source_url=pages[0] if pages else "",
+            pages_crawled=pages_crawled,
+            colors=list(self.colors.values()),
+            typography=list(self.typography.values()),
+            spacing=list(self.spacing.values()),
+            radius=list(self.radius.values()),
+            shadows=list(self.shadows.values()),
+            font_families=list(self.font_families.values()),
+            spacing_base=spacing_base,
+            extraction_timestamp=start_time,
+            extraction_duration_ms=duration_ms,
+            total_elements_analyzed=self.total_elements,
+            unique_colors=len(self.colors),
+            unique_font_sizes=len(set(t.font_size for t in self.typography.values())),
+            unique_spacing_values=len(self.spacing),
+            errors=self.errors,
+            warnings=self.warnings,
+        )
+
+
+# =============================================================================
+# CONVENIENCE FUNCTIONS
+# =============================================================================
+
+async def extract_from_pages(
+    pages: list[str],
+    viewport: Viewport = Viewport.DESKTOP
+) -> ExtractedTokens:
+    """Convenience function to extract tokens from pages."""
+    extractor = TokenExtractor(viewport=viewport)
+    return await extractor.extract(pages)
+
+
+async def extract_both_viewports(pages: list[str]) -> tuple[ExtractedTokens, ExtractedTokens]:
+    """Extract tokens from both desktop and mobile viewports."""
+    desktop_extractor = TokenExtractor(viewport=Viewport.DESKTOP)
+    mobile_extractor = TokenExtractor(viewport=Viewport.MOBILE)
+    
+    desktop_result = await desktop_extractor.extract(pages)
+    mobile_result = await mobile_extractor.extract(pages)
+    
+    return desktop_result, mobile_result