Improve build system and clean up project structure

- Configure build script to create backups in backup/ directory - Add backup/ directory to .gitignore to keep repo clean - Add .gitignore file with common exclusions - Remove obsolete dog-food-calculator-widget.js file - Move all temporary and reference files to sundog-calculator-meta/ This keeps the project root clean and organized while maintaining automatic backups during builds.
Reorganize source structure for better maintainability
2025-08-18 09:21:54 +02:00 · 2025-08-18 09:05:00 +02:00 · 2025-08-17 21:20:05 +02:00
10 changed files with 3647 additions and 1810 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,27 @@
+# Dependencies
+node_modules/
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Temporary files
+*.tmp
+*.temp
+
+# Personal files
+theme.scss
+_variables.scss
+reference.png
+better.png
+START_PROMPT.md
+CLAUDE.md
+CLAUDE_V2.md
+math.md
+vetcalculators/
+*.js.backup*
+backup/
--- a/build.js
+++ b/build.js
@ -1,46 +1,74 @@
 #!/usr/bin/env node

 /**
- * Dog Calculator Build System - PRODUCTION VERSION
+ * Dog Calculator Build System - ORGANIZED VERSION
 * 
- * This FIXED build script generates iframe.html and dog-calculator-widget.js
- * with EXACTLY the same functionality from iframe.html as the single source of truth.
+ * This build script generates iframe.html and sundog-dog-food-calculator.js
+ * from organized source files in the src/ directory.
+ * 
+ * Source structure:
+ * - src/index.html - HTML template
+ * - src/css/main.css - Main styles
+ * - src/css/themes.css - Theme-specific styles
+ * - src/js/config.js - Configuration constants
+ * - src/js/calculator.js - JavaScript functionality
+ * 
+ * Output files:
+ * - iframe.html - Standalone calculator page
+ * - sundog-dog-food-calculator.js - Embeddable widget
 * 
 * Usage: node build.js
- * 
- * ✅ WORKS CORRECTLY - Fixed the previous broken implementation
 */

 const fs = require('fs');
 const path = require('path');

-console.log('🎯 Dog Calculator Build System - FIXED & WORKING');
+console.log('🎯 Dog Calculator Build System - ORGANIZED VERSION');
 console.log('');

 /**
- * Extract and parse components from the master iframe.html
+ * Read organized components from src directory
 */
-function parseIframeComponents() {
-    if (!fs.existsSync('iframe.html')) {
-        throw new Error('iframe.html not found - this is the master file that should exist');
+function readSourceComponents() {
+    const srcDir = 'src';
+    
+    // Check if src directory exists
+    if (!fs.existsSync(srcDir)) {
+        throw new Error('src directory not found');
    }
    
-    const content = fs.readFileSync('iframe.html', 'utf8');
+    // Read CSS files
+    const mainCssPath = path.join(srcDir, 'css', 'main.css');
+    const themesCssPath = path.join(srcDir, 'css', 'themes.css');
+    if (!fs.existsSync(mainCssPath)) {
+        throw new Error('src/css/main.css not found');
+    }
+    if (!fs.existsSync(themesCssPath)) {
+        throw new Error('src/css/themes.css not found');
+    }
+    const mainCss = fs.readFileSync(mainCssPath, 'utf8').trim();
+    const themesCss = fs.readFileSync(themesCssPath, 'utf8').trim();
+    const css = mainCss + '\n\n' + themesCss;
    
-    // Extract CSS (everything between <style> and </style>)
-    const cssMatch = content.match(/<style>([\s\S]*?)<\/style>/);
-    if (!cssMatch) throw new Error('Could not extract CSS from iframe.html');
-    const css = cssMatch[1].trim();
+    // Read HTML template
+    const htmlPath = path.join(srcDir, 'index.html');
+    if (!fs.existsSync(htmlPath)) {
+        throw new Error('src/index.html not found');
+    }
+    const html = fs.readFileSync(htmlPath, 'utf8').trim();
    
-    // Extract HTML body (everything between <body> and <script>)
-    const htmlMatch = content.match(/<body>([\s\S]*?)<script>/);
-    if (!htmlMatch) throw new Error('Could not extract HTML from iframe.html');
-    const html = htmlMatch[1].trim();
-    
-    // Extract JavaScript (everything between <script> and </script>)
-    const jsMatch = content.match(/<script>([\s\S]*?)<\/script>/);
-    if (!jsMatch) throw new Error('Could not extract JavaScript from iframe.html');
-    const js = jsMatch[1].trim();
+    // Read JavaScript files
+    const configPath = path.join(srcDir, 'js', 'config.js');
+    const calculatorPath = path.join(srcDir, 'js', 'calculator.js');
+    if (!fs.existsSync(configPath)) {
+        throw new Error('src/js/config.js not found');
+    }
+    if (!fs.existsSync(calculatorPath)) {
+        throw new Error('src/js/calculator.js not found');
+    }
+    const config = fs.readFileSync(configPath, 'utf8').trim();
+    const calculator = fs.readFileSync(calculatorPath, 'utf8').trim();
+    const js = config + '\n\n' + calculator;
    
    return { css, html, js };
 }
@ -49,17 +77,27 @@ function parseIframeComponents() {
 * Backup existing files
 */
 function backupFiles() {
-    const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
+    const backupDir = 'backup';
    
-    if (fs.existsSync('sundog-dog-food-calculator.js')) {
-        const backupName = `sundog-dog-food-calculator.js.backup-${timestamp}`;
-        fs.copyFileSync('sundog-dog-food-calculator.js', backupName);
-        console.log(`📦 Backed up existing widget to: ${backupName}`);
+    // Create backup directory if it doesn't exist
+    if (!fs.existsSync(backupDir)) {
+        fs.mkdirSync(backupDir);
    }
+    
+    const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
+    const filesToBackup = ['iframe.html', 'sundog-dog-food-calculator.js'];
+    
+    filesToBackup.forEach(file => {
+        if (fs.existsSync(file)) {
+            const backupName = path.join(backupDir, `${file}.backup-${timestamp}`);
+            fs.copyFileSync(file, backupName);
+            console.log(`   📦 Backed up ${file}`);
+        }
+    });
 }

 /**
- * Generate iframe.html (regenerate from components for consistency)
+ * Generate iframe.html from modular components
 */
 function generateIframe(css, html, js) {
    const content = `<!DOCTYPE html>
@ -69,6 +107,9 @@ function generateIframe(css, html, js) {
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dog Calorie Calculator - Canine Nutrition and Wellness</title>
    <style>
+        /* Sundog Dog Food Calorie Calculator Styles */
+        
+        /* CSS Variables for theming */
        ${css}
    </style>
 </head>
@ -80,30 +121,14 @@ function generateIframe(css, html, js) {
 </body>
 </html>`;

-    // Since iframe.html is our source, we don't overwrite it
-    // This function is here for consistency and testing
    return content;
 }

 /**
- * No transformation needed - keep original class names for consistency
- */
-function transformCSSForWidget(css) {
-    return css;
-}
-
-/**
- * No transformation needed - keep original class names for consistency
- */
-function transformHTMLForWidget(html) {
-    return html;
-}
-
-/**
- * Create production-ready widget JavaScript that uses the ACTUAL extracted JS from iframe.html
+ * Create production-ready widget JavaScript
 */
 function createWidgetJS(css, html, js) {
-    // Transform the extracted JavaScript from iframe.html to work as a widget
+    // Transform the JavaScript from calculator.js to work as a widget
    
    // Replace the iframe's DOMContentLoaded listener with widget initialization
    let transformedJS = js
@ -175,12 +200,18 @@ function createWidgetJS(css, html, js) {
            }
        }$2`);

+    // Add CSS variables to widget CSS
+    const widgetCSS = `/* Sundog Dog Food Calorie Calculator Styles */
+        
+        /* CSS Variables for theming */
+        ${css}`;
+
    const widgetCode = `/**
 * Dog Calorie Calculator Widget
 * Embeddable JavaScript widget for websites
 * 
- * THIS CODE IS AUTO-GENERATED FROM iframe.html - DO NOT EDIT MANUALLY
- * Edit iframe.html and run 'node build.js' to update this file
+ * THIS CODE IS AUTO-GENERATED FROM src/ FILES - DO NOT EDIT MANUALLY
+ * Edit files in src/ directory and run 'node build.js' to update
 * 
 * Usage:
 * <script src="sundog-dog-food-calculator.js"></script>
@ -197,7 +228,7 @@ function createWidgetJS(css, html, js) {
    'use strict';
    
    // Inject widget styles
-    const CSS_STYLES = \`${css}\`;
+    const CSS_STYLES = \`${widgetCSS}\`;
    
    function injectStyles() {
        if (document.getElementById('dog-calculator-styles')) return;
@ -208,7 +239,7 @@ function createWidgetJS(css, html, js) {
        document.head.appendChild(style);
    }
    
-    // ACTUAL JavaScript from iframe.html (transformed for widget use)
+    // JavaScript from src/calculator.js (transformed for widget use)
    ${transformedJS}
    
    // Auto-initialize widgets on page load
@ -249,37 +280,59 @@ function createWidgetJS(css, html, js) {
 */
 function build() {
    try {
-        console.log('📖 Reading components from iframe.html (master source)...');
-        const { css, html, js } = parseIframeComponents();
+        console.log('📖 Reading organized components from src/ directory...');
+        const { css, html, js } = readSourceComponents();
+        console.log('   ✅ src/index.html (' + html.split('\n').length + ' lines)');
+        console.log('   ✅ src/css/main.css + themes.css (' + css.split('\n').length + ' lines)');
+        console.log('   ✅ src/js/config.js + calculator.js (' + js.split('\n').length + ' lines)');
        
+        console.log('');
        console.log('📦 Backing up existing files...');
        backupFiles();
        
-        console.log('🏗️ Generating sundog-dog-food-calculator.js...');
+        console.log('');
+        console.log('🏗️ Building output files...');
+        
+        // Generate iframe.html
+        const iframeContent = generateIframe(css, html, js);
+        fs.writeFileSync('iframe.html', iframeContent);
+        console.log('   ✅ Generated iframe.html');
+        
+        // Generate widget
        const widgetCode = createWidgetJS(css, html, js);
        fs.writeFileSync('sundog-dog-food-calculator.js', widgetCode);
-        console.log('✅ Generated sundog-dog-food-calculator.js');
+        console.log('   ✅ Generated sundog-dog-food-calculator.js');
        
        console.log('');
        console.log('🎉 Build completed successfully!');
        console.log('');
        console.log('📋 Summary:');
-        console.log('   ✅ iframe.html - Master source (no changes needed)');
-        console.log('   ✅ sundog-dog-food-calculator.js - Generated with identical functionality');
+        console.log('   Source structure:');
+        console.log('   • src/index.html - HTML structure');
+        console.log('   • src/css/main.css - Core styles');
+        console.log('   • src/css/themes.css - Theme variations');
+        console.log('   • src/js/config.js - Configuration');
+        console.log('   • src/js/calculator.js - Main logic');
        console.log('');
-        console.log('🔄 Your new workflow:');
-        console.log('   1. Edit iframe.html for any changes (calculations, design, layout)');
+        console.log('   Generated files:');
+        console.log('   • iframe.html - Standalone calculator');
+        console.log('   • sundog-dog-food-calculator.js - Embeddable widget');
+        console.log('');
+        console.log('🔄 Your workflow:');
+        console.log('   1. Edit organized files in src/');
        console.log('   2. Run: node build.js');
-        console.log('   3. Both files now have the same functionality!');
+        console.log('   3. Both output files are regenerated!');
        console.log('');
-        console.log('💡 No more maintaining two separate files!');
+        console.log('💡 Clean, organized structure - easy to maintain!');
        
    } catch (error) {
        console.error('❌ Build failed:', error.message);
+        console.error(error.stack);
        process.exit(1);
    }
 }

+// Run build if called directly
 if (require.main === module) {
    build();
 }
--- a/dog-food-calculator-widget.js
+++ b/dog-food-calculator-widget.js
--- a/iframe.html
+++ b/iframe.html
@ -448,7 +448,8 @@
        }

        /* Dark theme - manual override */
-        .dog-calculator-container.theme-dark {
+
+.dog-calculator-container.theme-dark {
            --bg-primary: #24202d;
            --bg-secondary: #312b3b;
            --border-color: #433c4f;
@ -2022,11 +2023,20 @@
            </div>
        </div>
    </div>
-
-
-
    <script>
        /**
+ * Configuration constants for Dog Calorie Calculator
+ */
+
+const CALCULATOR_CONFIG = {
+    defaultTheme: 'system',
+    defaultScale: 1.0,
+    maxFoodSources: 5,
+    minScale: 0.5,
+    maxScale: 2.0
+};
+
+/**
         * Dog Calorie Calculator - iframe version
         * by Canine Nutrition and Wellness
         */
@ -2035,10 +2045,10 @@
            constructor() {
                this.currentMER = 0;
                this.isImperial = false;
-                this.theme = this.getThemeFromURL() || 'system';
-                this.scale = this.getScaleFromURL() || 1.0;
+                this.theme = this.getThemeFromURL() || CALCULATOR_CONFIG.defaultTheme;
+                this.scale = this.getScaleFromURL() || CALCULATOR_CONFIG.defaultScale;
                this.foodSources = [];
-                this.maxFoodSources = 5;
+                this.maxFoodSources = CALCULATOR_CONFIG.maxFoodSources;
                this.init();
            }

@ -2064,7 +2074,7 @@
            getScaleFromURL() {
                const urlParams = new URLSearchParams(window.location.search);
                const scale = parseFloat(urlParams.get('scale'));
-                return (!isNaN(scale) && scale >= 0.5 && scale <= 2.0) ? scale : null;
+                return (!isNaN(scale) && scale >= CALCULATOR_CONFIG.minScale && scale <= CALCULATOR_CONFIG.maxScale) ? scale : null;
            }

            applyTheme() {
@ -2077,8 +2087,8 @@
                const container = document.getElementById('dogCalculator');
                if (!container) return;

-                // Clamp scale between 0.5 and 2.0 for usability
-                const clampedScale = Math.max(0.5, Math.min(2.0, this.scale));
+                // Clamp scale between min and max for usability
+                const clampedScale = Math.max(CALCULATOR_CONFIG.minScale, Math.min(CALCULATOR_CONFIG.maxScale, this.scale));
                
                if (clampedScale !== 1.0) {
                    container.style.transform = `scale(${clampedScale})`;
--- a/src/css/main.css
+++ b/src/css/main.css
@ -0,0 +1,440 @@
+        :root {
+            --bg-primary: #fdfcfe;
+            --bg-secondary: #ffffff;
+            --border-color: #e8e3ed;
+            --text-primary: #6f3f6d;
+            --text-secondary: #8f7a8e;
+            --accent-color: #f19a5f;
+            --text-label: #635870;      /* For form labels, secondary UI text */
+            --success-color: #7fa464;   /* Green for success states */
+            --bg-tertiary: #f8f5fa;     /* Light background variant */
+            --error-color: #e87159;     /* Error states and messages */
+        }
+
+        body {
+            margin: 0;
+            padding: 0;
+            background: transparent;
+            overflow-x: hidden;
+            font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+            line-height: 1.5;
+            color: var(--text-primary);
+        }
+
+        .dog-calculator-container {
+            max-width: 600px;
+            margin: 0 auto;
+            padding: 24px;
+            box-sizing: border-box;
+            opacity: 0;
+            transition: opacity 0.3s ease;
+        }
+
+        .dog-calculator-container.loaded {
+            opacity: 1;
+        }
+
+        .dog-calculator-container *,
+        .dog-calculator-container *::before,
+        .dog-calculator-container *::after {
+            box-sizing: border-box;
+        }
+
+        .dog-calculator-section {
+            background: var(--bg-primary);
+            border: 1px solid var(--border-color);
+            border-radius: 8px 8px 0 0;
+            padding: 24px;
+            margin-bottom: 0;
+            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
+        }
+
+        .dog-calculator-section-header {
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+            margin-bottom: 24px;
+            flex-wrap: wrap;
+            gap: 16px;
+        }
+
+        .dog-calculator-section h2 {
+            margin: 0;
+            color: var(--text-primary);
+            font-size: 1.5rem;
+            font-weight: 600;
+        }
+
+        /* Unit Switch */
+        .dog-calculator-unit-switch {
+            display: flex;
+            align-items: center;
+            gap: 12px;
+        }
+
+        .dog-calculator-unit-label {
+            font-size: 0.9rem;
+            font-weight: 500;
+            color: var(--text-label);
+            transition: color 0.2s ease;
+        }
+
+        .dog-calculator-unit-label.active {
+            color: var(--text-primary);
+            font-weight: 600;
+        }
+
+        .dog-calculator-switch {
+            position: relative;
+            display: inline-block;
+            width: 48px;
+            height: 24px;
+        }
+
+        .dog-calculator-switch input {
+            opacity: 0;
+            width: 0;
+            height: 0;
+        }
+
+        .dog-calculator-slider {
+            position: absolute;
+            cursor: pointer;
+            top: 0;
+            left: 0;
+            right: 0;
+            bottom: 0;
+            background-color: var(--border-color);
+            transition: 0.3s;
+            border-radius: 24px;
+        }
+
+        .dog-calculator-slider:before {
+            position: absolute;
+            content: "";
+            height: 18px;
+            width: 18px;
+            left: 3px;
+            bottom: 3px;
+            background-color: white;
+            transition: 0.3s;
+            border-radius: 50%;
+            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
+        }
+
+        .dog-calculator-switch input:checked + .dog-calculator-slider {
+            background-color: #f19a5f;
+        }
+
+        .dog-calculator-switch input:checked + .dog-calculator-slider:before {
+            transform: translateX(24px);
+        }
+
+        .dog-calculator-form-group {
+            margin-bottom: 20px;
+        }
+
+        .dog-calculator-form-group label {
+            display: block;
+            margin-bottom: 8px;
+            font-weight: 500;
+            color: var(--text-primary);
+            font-size: 1rem;
+        }
+
+        .dog-calculator-form-group select,
+        .dog-calculator-form-group input[type="number"],
+        .dog-calculator-form-group input[type="text"] {
+            width: 100%;
+            padding: 12px 16px;
+            border: 1px solid var(--border-color);
+            border-radius: 6px;
+            font-size: 1rem;
+            font-family: inherit;
+            background-color: var(--bg-secondary);
+            color: var(--text-primary);
+            transition: all 0.2s ease;
+            -webkit-appearance: none;
+            -moz-appearance: none;
+            appearance: none;
+            background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236f3f6d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
+            background-repeat: no-repeat;
+            background-position: right 12px center;
+            background-size: 20px;
+            padding-right: 40px;
+        }
+
+        .dog-calculator-form-group select option {
+            background-color: var(--bg-secondary);
+            color: var(--text-primary);
+        }
+
+        .dog-calculator-form-group input[type="number"],
+        .dog-calculator-form-group input[type="text"] {
+            background-image: none;
+            padding-right: 16px;
+        }
+
+        .dog-calculator-form-group select:focus,
+        .dog-calculator-form-group input[type="number"]:focus,
+        .dog-calculator-form-group input[type="text"]:focus {
+            outline: none;
+            border-color: #f19a5f;
+            background-color: var(--bg-secondary);
+            box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.1);
+        }
+
+        .dog-calculator-form-group input[readonly] {
+            background-color: var(--bg-tertiary);
+            cursor: not-allowed;
+            color: var(--text-label);
+        }
+
+        .dog-calculator-results {
+            background: linear-gradient(135deg, rgba(241, 154, 95, 0.08) 0%, rgba(241, 154, 95, 0.04) 100%);
+            border: 1px solid rgba(241, 154, 95, 0.2);
+            border-radius: 6px;
+            padding: 20px;
+            margin-top: 24px;
+        }
+
+        .dog-calculator-result-item {
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+            margin-bottom: 12px;
+        }
+
+        .dog-calculator-result-item:last-child {
+            margin-bottom: 0;
+        }
+
+        .dog-calculator-result-label {
+            font-weight: 500;
+            color: var(--text-primary);
+            font-size: 0.95rem;
+        }
+
+        .dog-calculator-result-value {
+            font-weight: 600;
+            color: var(--text-primary);
+            font-size: 1.1rem;
+            padding: 4px 12px;
+            background: rgba(241, 154, 95, 0.15);
+            border-radius: 4px;
+        }
+
+        .dog-calculator-collapsible {
+            background: var(--bg-primary);
+            border: 1px solid var(--border-color);
+            border-top: none;
+            margin-bottom: 0;
+            overflow: hidden;
+            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
+        }
+
+        .dog-calculator-collapsible-header {
+            background: var(--bg-tertiary);
+            padding: 20px 24px;
+            border-bottom: 1px solid var(--border-color);
+        }
+
+        .dog-calculator-collapsible-header h3 {
+            margin: 0;
+            font-size: 1.25rem;
+            color: var(--text-primary);
+            font-weight: 600;
+        }
+
+        .dog-calculator-collapsible-content {
+            display: block;
+        }
+
+        .dog-calculator-collapsible-inner {
+            padding: 24px;
+        }
+
+        .dog-calculator-input-group {
+            display: flex;
+            gap: 16px;
+            align-items: flex-end;
+        }
+
+        .dog-calculator-input-group .dog-calculator-form-group {
+            flex: 1;
+            margin-bottom: 0;
+        }
+
+        .dog-calculator-unit-select {
+            min-width: 120px;
+        }
+
+        .dog-calculator-error {
+            color: var(--error-color);
+            font-size: 0.875rem;
+            margin-top: 6px;
+            font-weight: 500;
+        }
+
+        .dog-calculator-hidden {
+            display: none;
+        }
+
+        /* Action Buttons */
+        .dog-calculator-action-buttons {
+            display: flex;
+            justify-content: center;
+            gap: 16px;
+            padding: 20px;
+            background: var(--bg-tertiary);
+            border-left: 1px solid var(--border-color);
+            border-right: 1px solid var(--border-color);
+            margin-top: -1px;
+            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
+        }
+
+        .dog-calculator-btn {
+            padding: 8px 16px;
+            border: 1px solid var(--border-color);
+            border-radius: 6px;
+            font-size: 0.9rem;
+            font-weight: 500;
+            font-family: inherit;
+            cursor: pointer;
+            transition: all 0.2s ease;
+            display: inline-flex;
+            align-items: center;
+            gap: 6px;
+            background: white;
+            color: var(--text-primary);
+        }
+
+        .dog-calculator-btn:hover {
+            transform: translateY(-1px);
+            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+        }
+
+        .dog-calculator-btn-share:hover {
+            border-color: #9f5999;
+            color: #9f5999;
+        }
+
+        .dog-calculator-btn-embed:hover {
+            border-color: var(--success-color);
+            color: var(--success-color);
+        }
+
+        .dog-calculator-footer {
+            text-align: center;
+            padding: 20px;
+            background: var(--bg-primary);
+            border: 1px solid var(--border-color);
+            border-radius: 0 0 8px 8px;
+            border-top: none;
+            margin-top: -1px;
+            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
+        }
+
+        .dog-calculator-footer a {
+            color: #9f5999;
+            text-decoration: none;
+            font-size: 0.9rem;
+            font-weight: 500;
+            transition: color 0.2s ease;
+        }
+
+        .dog-calculator-footer a:hover {
+            color: #f19a5f;
+            text-decoration: underline;
+        }
+
+        /* Mobile Responsive Design */
+        @media (max-width: 576px) {
+            .dog-calculator-container {
+                padding: 16px;
+            }
+
+            .dog-calculator-section,
+            .dog-calculator-collapsible-inner {
+                padding: 20px;
+            }
+
+            .dog-calculator-section h2,
+            .dog-calculator-collapsible-header h3 {
+                font-size: 1.3rem;
+            }
+
+            .dog-calculator-section-header {
+                flex-direction: column;
+                align-items: stretch;
+                gap: 12px;
+            }
+
+            .dog-calculator-section h2 {
+                text-align: center;
+            }
+
+            .dog-calculator-unit-switch {
+                justify-content: center;
+            }
+
+            .dog-calculator-action-buttons {
+                flex-direction: column;
+                padding: 16px;
+            }
+
+            .dog-calculator-btn {
+                width: 100%;
+                justify-content: center;
+            }
+
+            .dog-calculator-input-group {
+                flex-direction: row;
+                gap: 12px;
+                align-items: flex-end;
+            }
+
+            .dog-calculator-input-group .dog-calculator-form-group {
+                margin-bottom: 0;
+            }
+
+            /* First form group takes 55%, second takes 40% with some flex */
+            .dog-calculator-input-group .dog-calculator-form-group:first-child {
+                flex: 0 0 55%;
+            }
+
+            .dog-calculator-input-group .dog-calculator-form-group:last-child {
+                flex: 1 1 40%;
+                min-width: 100px;
+            }
+
+            /* Make sure number inputs don't get too wide */
+            .dog-calculator-input-group input[type="number"] {
+                max-width: 100%;
+            }
+
+            /* Ensure dropdowns don't overflow their containers */
+            .dog-calculator-input-group select {
+                max-width: 100%;
+                overflow: hidden;
+                text-overflow: ellipsis;
+            }
+
+
+            .dog-calculator-result-item {
+                flex-direction: column;
+                align-items: flex-start;
+                gap: 8px;
+            }
+
+            .dog-calculator-result-value {
+                align-self: stretch;
+                text-align: center;
+            }
+
+            .dog-calculator-collapsible-header {
+                padding: 16px 20px;
+            }
+        }
+
+        /* Dark theme - manual override */
--- a/src/css/themes.css
+++ b/src/css/themes.css
--- a/src/index.html
+++ b/src/index.html
@ -0,0 +1,189 @@
+    <div class="dog-calculator-container" id="dogCalculator">
+        <div class="dog-calculator-section">
+            <div class="dog-calculator-section-header">
+                <h2>Dog's Characteristics</h2>
+                <div class="dog-calculator-unit-switch">
+                    <span class="dog-calculator-unit-label active" id="metricLabel">Metric</span>
+                    <label class="dog-calculator-switch">
+                        <input type="checkbox" id="unitToggle">
+                        <span class="dog-calculator-slider"></span>
+                    </label>
+                    <span class="dog-calculator-unit-label" id="imperialLabel">Imperial</span>
+                </div>
+            </div>
+            
+            <div class="dog-calculator-form-group">
+                <label for="dogType">Dog Type / Activity Level:</label>
+                <select id="dogType" aria-describedby="dogTypeHelp">
+                    <option value="">Select dog type...</option>
+                    <option value="3.0">Puppy (0-4 months)</option>
+                    <option value="2.0">Puppy (4 months - adult)</option>
+                    <option value="1.2">Adult - inactive/obese</option>
+                    <option value="1.6">Adult (neutered/spayed) - average activity</option>
+                    <option value="1.8">Adult (intact) - average activity</option>
+                    <option value="1.0">Adult - weight loss</option>
+                    <option value="1.7">Adult - weight gain</option>
+                    <option value="2.0">Working dog - light work</option>
+                    <option value="3.0">Working dog - moderate work</option>
+                    <option value="5.0">Working dog - heavy work</option>
+                    <option value="1.1">Senior dog</option>
+                </select>
+            </div>
+
+            <div class="dog-calculator-form-group">
+                <label for="weight" id="weightLabel">Dog's Weight (kg):</label>
+                <input type="number" id="weight" min="0.1" step="0.1" placeholder="Enter weight in kg" aria-describedby="weightHelp">
+                <div id="weightError" class="dog-calculator-error dog-calculator-hidden">Please enter a valid weight (minimum 0.1 kg)</div>
+            </div>
+
+            <div class="dog-calculator-results" id="calorieResults" style="display: none;">
+                <div class="dog-calculator-result-item">
+                    <span class="dog-calculator-result-label">Resting Energy Requirement (RER):</span>
+                    <span class="dog-calculator-result-value" id="rerValue">- cal/day</span>
+                </div>
+                <div class="dog-calculator-result-item">
+                    <span class="dog-calculator-result-label">Maintenance Energy Requirement (MER):</span>
+                    <span class="dog-calculator-result-value" id="merValue">- cal/day</span>
+                </div>
+            </div>
+        </div>
+
+        <div class="dog-calculator-collapsible active" id="foodCalculator">
+            <div class="dog-calculator-collapsible-header">
+                <h3>How much should I feed?</h3>
+            </div>
+            <div class="dog-calculator-collapsible-content">
+                <div class="dog-calculator-collapsible-inner">
+                    <!-- Food Sources Container -->
+                    <div class="dog-calculator-food-sources" id="foodSources">
+                        <!-- Initial food source will be added by JavaScript -->
+                    </div>
+
+                    <!-- Add Food Source Button -->
+                    <button class="dog-calculator-add-food-btn" id="addFoodBtn" type="button">
+                        <span>+</span>
+                        <span>Add another food source</span>
+                    </button>
+
+                    <!-- Per-Food Results -->
+                    <div class="dog-calculator-food-results" id="foodBreakdownResults" style="display: none;">
+                        <div id="foodBreakdownList">
+                            <!-- Individual food breakdowns will be populated by JavaScript -->
+                        </div>
+                    </div>
+
+                    <!-- Unit Selection Buttons -->
+                    <div class="dog-calculator-unit-buttons" id="unitButtons" style="display: none;">
+                        <button type="button" class="dog-calculator-unit-btn active" data-unit="g">g</button>
+                        <button type="button" class="dog-calculator-unit-btn" data-unit="kg">kg</button>
+                        <button type="button" class="dog-calculator-unit-btn" data-unit="oz">oz</button>
+                        <button type="button" class="dog-calculator-unit-btn" data-unit="lb">lb</button>
+                    </div>
+
+                    <!-- Daily Total Results -->
+                    <div class="dog-calculator-results" id="dailyFoodResults" style="display: none;">
+                        <div class="dog-calculator-result-item">
+                            <span class="dog-calculator-result-label">Total Daily Amount:</span>
+                            <span class="dog-calculator-result-value" id="dailyFoodValue">- g/day</span>
+                        </div>
+                    </div>
+
+                    <!-- Hidden select for compatibility -->
+                    <select id="unit" class="dog-calculator-unit-select-hidden" aria-describedby="unitHelp">
+                        <option value="g">grams (g)</option>
+                        <option value="kg">kilograms (kg)</option>
+                        <option value="oz">ounces (oz)</option>
+                        <option value="lb">pounds (lb)</option>
+                    </select>
+
+                    <div class="dog-calculator-food-amounts-section" id="foodAmountsSection" style="display: none;">
+                        <h4 class="dog-calculator-section-title">
+                            Calculate amounts for 
+                            <input type="number" id="days" min="1" step="1" value="1" placeholder="1" aria-describedby="daysHelp" class="dog-calculator-inline-days"> 
+                            <span id="dayLabel">day</span>:
+                        </h4>
+                        <div id="daysError" class="dog-calculator-error dog-calculator-hidden">Please enter a valid number of days (minimum 1)</div>
+                        <div id="foodAmountsList" class="dog-calculator-food-amounts-list">
+                            <!-- Individual food amounts will be populated here -->
+                        </div>
+                        <div class="dog-calculator-total-row" id="totalAmountRow">
+                            <span class="dog-calculator-total-label">Total Amount:</span>
+                            <span class="dog-calculator-total-value" id="totalAmountDisplay"></span>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="dog-calculator-action-buttons">
+            <button class="dog-calculator-btn dog-calculator-btn-share" id="shareBtn">
+                Share
+            </button>
+            <button class="dog-calculator-btn dog-calculator-btn-embed" id="embedBtn">
+                Embed
+            </button>
+        </div>
+
+        <div class="dog-calculator-footer">
+            <a href="https://caninenutritionandwellness.com" target="_blank" rel="noopener noreferrer">
+                by caninenutritionandwellness.com
+            </a>
+        </div>
+        <!-- Share Modal -->
+        <div id="shareModal" class="dog-calculator-modal" style="display: none;">
+            <div class="dog-calculator-modal-content">
+                <span class="dog-calculator-modal-close" id="shareModalClose">&times;</span>
+                <h3>Share Calculator</h3>
+                <div class="dog-calculator-share-buttons">
+                    <button class="dog-calculator-share-btn dog-calculator-share-facebook plausible-event-name=Calculator+Usage plausible-event-action=calculator-share-facebook" id="shareFacebook">
+                        Facebook
+                    </button>
+                    <button class="dog-calculator-share-btn dog-calculator-share-twitter plausible-event-name=Calculator+Usage plausible-event-action=calculator-share-twitter" id="shareTwitter">
+                        Twitter
+                    </button>
+                    <button class="dog-calculator-share-btn dog-calculator-share-linkedin plausible-event-name=Calculator+Usage plausible-event-action=calculator-share-linkedin" id="shareLinkedIn">
+                        LinkedIn
+                    </button>
+                    <button class="dog-calculator-share-btn dog-calculator-share-email plausible-event-name=Calculator+Usage plausible-event-action=calculator-share-email" id="shareEmail">
+                        Email
+                    </button>
+                    <button class="dog-calculator-share-btn dog-calculator-share-copy plausible-event-name=Calculator+Usage plausible-event-action=calculator-share-copy-link" id="shareCopy">
+                        Copy Link
+                    </button>
+                </div>
+                <div class="dog-calculator-share-url">
+                    <input type="text" id="shareUrl" readonly>
+                </div>
+            </div>
+        </div>
+
+        <!-- Embed Modal -->
+        <div id="embedModal" class="dog-calculator-modal" style="display: none;">
+            <div class="dog-calculator-modal-content dog-calculator-modal-embed">
+                <span class="dog-calculator-modal-close" id="embedModalClose">&times;</span>
+                <h3>⚡ Embed the Calculator</h3>
+                
+                <div class="dog-calculator-embed-options">
+                    <div class="dog-calculator-embed-option">
+                        <h4>⚡ JavaScript Widget</h4>
+                        <div class="dog-calculator-code-container">
+                            <pre><code id="widgetCode"></code></pre>
+                            <button class="dog-calculator-copy-btn plausible-event-name=Calculator+Usage plausible-event-action=calculator-embed-js" id="copyWidget">
+                                Copy
+                            </button>
+                        </div>
+                    </div>
+                    
+                    <div class="dog-calculator-embed-option">
+                        <h4>🛡️ iframe Embed</h4>
+                        <div class="dog-calculator-code-container">
+                            <pre><code id="iframeCode"></code></pre>
+                            <button class="dog-calculator-copy-btn plausible-event-name=Calculator+Usage plausible-event-action=calculator-embed-iframe" id="copyIframe">
+                                Copy
+                            </button>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
--- a/src/js/calculator.js
+++ b/src/js/calculator.js
--- a/src/js/config.js
+++ b/src/js/config.js
@ -0,0 +1,11 @@
+/**
+ * Configuration constants for Dog Calorie Calculator
+ */
+
+const CALCULATOR_CONFIG = {
+    defaultTheme: 'system',
+    defaultScale: 1.0,
+    maxFoodSources: 5,
+    minScale: 0.5,
+    maxScale: 2.0
+};
--- a/sundog-dog-food-calculator.js
+++ b/sundog-dog-food-calculator.js
@ -2,8 +2,8 @@
 * Dog Calorie Calculator Widget
 * Embeddable JavaScript widget for websites
 * 
- * THIS CODE IS AUTO-GENERATED FROM iframe.html - DO NOT EDIT MANUALLY
- * Edit iframe.html and run 'node build.js' to update this file
+ * THIS CODE IS AUTO-GENERATED FROM src/ FILES - DO NOT EDIT MANUALLY
+ * Edit files in src/ directory and run 'node build.js' to update
 * 
 * Usage:
 * <script src="sundog-dog-food-calculator.js"></script>
@ -463,7 +463,8 @@
        }

        /* Dark theme - manual override */
-        .dog-calculator-container.theme-dark {
+
+.dog-calculator-container.theme-dark {
            --bg-primary: #24202d;
            --bg-secondary: #312b3b;
            --border-color: #433c4f;
@ -1855,8 +1856,20 @@
        document.head.appendChild(style);
    }
    
-    // ACTUAL JavaScript from iframe.html (transformed for widget use)
+    // JavaScript from src/calculator.js (transformed for widget use)
    /**
+ * Configuration constants for Dog Calorie Calculator
+ */
+
+const CALCULATOR_CONFIG = {
+    defaultTheme: 'system',
+    defaultScale: 1.0,
+    maxFoodSources: 5,
+    minScale: 0.5,
+    maxScale: 2.0
+};
+
+/**
         * Dog Calorie Calculator - iframe version
         * by Canine Nutrition and Wellness
         */
@ -1873,9 +1886,10 @@
            this.scale = this.options.scale;
                this.currentMER = 0;
                this.isImperial = false;
-                
+                this.theme = this.getThemeFromURL() || CALCULATOR_CONFIG.defaultTheme;
+                this.scale = this.getScaleFromURL() || CALCULATOR_CONFIG.defaultScale;
                this.foodSources = [];
-                this.maxFoodSources = 5;
+                this.maxFoodSources = CALCULATOR_CONFIG.maxFoodSources;
                this.init();
            }

@ -2097,7 +2111,7 @@
            getScaleFromURL() {
                const urlParams = new URLSearchParams(window.location.search);
                const scale = parseFloat(urlParams.get('scale'));
-                return (!isNaN(scale) && scale >= 0.5 && scale <= 2.0) ? scale : null;
+                return (!isNaN(scale) && scale >= CALCULATOR_CONFIG.minScale && scale <= CALCULATOR_CONFIG.maxScale) ? scale : null;
            }

            applyTheme() {
@ -2110,8 +2124,8 @@
                const container = this.container.querySelector('#dogCalculator');
                if (!container) return;

-                // Clamp scale between 0.5 and 2.0 for usability
-                const clampedScale = Math.max(0.5, Math.min(2.0, this.scale));
+                // Clamp scale between min and max for usability
+                const clampedScale = Math.max(CALCULATOR_CONFIG.minScale, Math.min(CALCULATOR_CONFIG.maxScale, this.scale));
                
                if (clampedScale !== 1.0) {
                    container.style.transform = `scale(${clampedScale})`;