sundog-calculator/sundog-dog-food-calculator.js

/**
 * Dog Calorie Calculator Widget
 * Embeddable JavaScript widget for websites
 * 
 * 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>
 * <div id="dog-calorie-calculator"></div>
 * 
 * Or with options:
 * <div id="dog-calorie-calculator" data-theme="dark" data-scale="1.2"></div>
 * 
 * By Canine Nutrition and Wellness
 * https://caninenutritionandwellness.com
 */

(function() {
    'use strict';
    
    // Inject widget styles
    const CSS_STYLES = `/* Sundog Dog Food Calorie Calculator Styles */
        
        /* CSS Variables for theming */
        :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 */

.dog-calculator-container.theme-dark {
            --bg-primary: #24202d;
            --bg-secondary: #312b3b;
            --border-color: #433c4f;
            --text-primary: #f5f3f7;
            --text-secondary: #b8b0c2;
            color: var(--text-primary);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-section,
        .dog-calculator-container.theme-dark .dog-calculator-collapsible {
            background: var(--bg-primary);
            border-color: var(--border-color);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-collapsible-header {
            background: var(--bg-secondary);
            border-color: var(--border-color);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-collapsible-header:hover {
            background: #3a3446;
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-section h2,
        .dog-calculator-container.theme-dark .dog-calculator-collapsible-header h3,
        .dog-calculator-container.theme-dark .dog-calculator-form-group label,
        .dog-calculator-container.theme-dark .dog-calculator-result-label {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-label {
            color: var(--text-secondary)
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-label.active {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-slider {
            background-color: var(--border-color);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-form-group select,
        .dog-calculator-container.theme-dark .dog-calculator-form-group input[type="number"],
        .dog-calculator-container.theme-dark .dog-calculator-form-group input[type="text"] {
            background-color: var(--bg-secondary);
            border-color: var(--border-color);
            color: var(--text-primary);
            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='%23f5f3f7' 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");
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-form-group select option {
            background-color: var(--bg-secondary);
            color: var(--text-primary);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-form-group select:focus,
        .dog-calculator-container.theme-dark .dog-calculator-form-group input[type="number"]:focus,
        .dog-calculator-container.theme-dark .dog-calculator-form-group input[type="text"]:focus {
            background-color: var(--bg-secondary);
            border-color: #f19a5f;
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-form-group input[readonly] {
            background-color: var(--border-color);
            color: var(--text-secondary)
        }

        .dog-calculator-container.theme-dark .dog-calculator-inline-unit {
            background-color: var(--bg-secondary);
            border-color: rgba(241, 154, 95, 0.5);
            color: var(--text-primary);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
            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='%23f5f3f7' 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");
        }

        .dog-calculator-container.theme-dark .dog-calculator-inline-unit:hover {
            border-color: #f19a5f;
            box-shadow: 0 2px 6px rgba(241, 154, 95, 0.3);
        }

        .dog-calculator-container.theme-dark .dog-calculator-inline-unit:focus {
            border-color: #f19a5f;
            box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.15);
        }

        .dog-calculator-container.theme-dark .dog-calculator-inline-unit option {
            background-color: var(--bg-secondary);
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-btn {
            background-color: var(--bg-secondary);
            border-color: var(--border-color);
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-btn:hover {
            border-color: #f19a5f;
            background: rgba(241, 154, 95, 0.2);
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-btn.active {
            border-color: #f19a5f;
            background: #f19a5f;
            color: white;
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-results {
            background: linear-gradient(135deg, rgba(241, 154, 95, 0.15) 0%, rgba(241, 154, 95, 0.08) 100%);
            border-color: rgba(241, 154, 95, 0.3);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-result-value {
            color: var(--text-primary);
            background: rgba(241, 154, 95, 0.2);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-footer {
            background: var(--bg-primary);
            border-color: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-action-buttons {
            background: var(--bg-secondary);
            border-color: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-btn {
            background: var(--border-color);
            border-color: var(--border-color);
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-btn:hover {
            background: #524a5f;
            border-color: #524a5f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-btn-share:hover {
            border-color: #9f5999;
            color: #f19a5f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-btn-embed:hover {
            border-color: var(--success-color);
            color: var(--success-color);
        }

        /* System theme - follows user's OS preference */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system {
                --bg-primary: #24202d;
                --bg-secondary: #312b3b;
                --border-color: #433c4f;
                --text-primary: #f5f3f7;
                --text-secondary: #b8b0c2;
                color: var(--text-primary);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-section,
            .dog-calculator-container.theme-system .dog-calculator-collapsible {
                background: var(--bg-primary);
                border-color: var(--border-color);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-collapsible-header {
                background: var(--bg-secondary);
                border-color: var(--border-color);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-collapsible-header:hover {
                background: #3a3446;
            }
            
            .dog-calculator-container.theme-system .dog-calculator-section h2,
            .dog-calculator-container.theme-system .dog-calculator-collapsible-header h3,
            .dog-calculator-container.theme-system .dog-calculator-form-group label,
            .dog-calculator-container.theme-system .dog-calculator-result-label {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-label {
                color: var(--text-secondary)
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-label.active {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-slider {
                background-color: var(--border-color);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-form-group select,
            .dog-calculator-container.theme-system .dog-calculator-form-group input[type="number"],
            .dog-calculator-container.theme-system .dog-calculator-form-group input[type="text"] {
                background-color: var(--bg-secondary);
                border-color: var(--border-color);
                color: var(--text-primary);
                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='%23f5f3f7' 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");
            }
            
            .dog-calculator-container.theme-system .dog-calculator-form-group select option {
                background-color: var(--bg-secondary);
                color: var(--text-primary);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-form-group select:focus,
            .dog-calculator-container.theme-system .dog-calculator-form-group input[type="number"]:focus,
            .dog-calculator-container.theme-system .dog-calculator-form-group input[type="text"]:focus {
                background-color: var(--bg-secondary);
                border-color: #f19a5f;
            }
            
            .dog-calculator-container.theme-system .dog-calculator-form-group input[readonly] {
                background-color: var(--border-color);
                color: var(--text-secondary)
            }

            .dog-calculator-container.theme-system .dog-calculator-inline-unit {
                background-color: var(--bg-secondary);
                border-color: rgba(241, 154, 95, 0.5);
                color: var(--text-primary);
                box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
                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='%23f5f3f7' 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");
            }

            .dog-calculator-container.theme-system .dog-calculator-inline-unit:hover {
                border-color: #f19a5f;
                box-shadow: 0 2px 6px rgba(241, 154, 95, 0.3);
            }

            .dog-calculator-container.theme-system .dog-calculator-inline-unit:focus {
                border-color: #f19a5f;
                box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.15);
            }

            .dog-calculator-container.theme-system .dog-calculator-inline-unit option {
                background-color: var(--bg-secondary);
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-btn {
                background-color: var(--bg-secondary);
                border-color: var(--border-color);
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-btn:hover {
                border-color: #f19a5f;
                background: rgba(241, 154, 95, 0.2);
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-btn.active {
                border-color: #f19a5f;
                background: #f19a5f;
                color: white;
            }
            
            .dog-calculator-container.theme-system .dog-calculator-results {
                background: linear-gradient(135deg, rgba(241, 154, 95, 0.15) 0%, rgba(241, 154, 95, 0.08) 100%);
                border-color: rgba(241, 154, 95, 0.3);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-result-value {
                color: var(--text-primary);
                background: rgba(241, 154, 95, 0.2);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-footer {
                background: var(--bg-primary);
                border-color: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-action-buttons {
                background: var(--bg-secondary);
                border-color: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-btn {
                background: var(--border-color);
                border-color: var(--border-color);
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-btn:hover {
                background: #524a5f;
                border-color: #524a5f;
            }

            .dog-calculator-container.theme-system .dog-calculator-btn-share:hover {
                border-color: #9f5999;
                color: #f19a5f;
            }

            .dog-calculator-container.theme-system .dog-calculator-btn-embed:hover {
                border-color: var(--success-color);
                color: var(--success-color);
            }
        }

        /* Modal Styles */
        .dog-calculator-modal {
            display: none;
            position: fixed;
            z-index: 10000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .dog-calculator-modal-content {
            position: relative;
            background-color: var(--bg-secondary);
            margin: 5% auto;
            padding: 30px;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            width: 90%;
            max-width: 500px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
            animation: slideIn 0.3s ease;
        }

        .dog-calculator-modal-embed {
            max-width: 700px;
        }

        @keyframes slideIn {
            from { 
                opacity: 0;
                transform: translateY(-20px);
            }
            to { 
                opacity: 1;
                transform: translateY(0);
            }
        }

        .dog-calculator-modal-close {
            position: absolute;
            right: 20px;
            top: 20px;
            font-size: 28px;
            font-weight: 300;
            color: var(--text-primary);
            cursor: pointer;
            transition: color 0.2s ease;
        }

        .dog-calculator-modal-close:hover {
            color: #f19a5f;
        }

        .dog-calculator-modal h3 {
            margin: 0 0 24px 0;
            color: var(--text-primary);
            font-size: 1.5rem;
        }

        /* Share Modal */
        .dog-calculator-share-buttons {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            gap: 12px;
            margin-bottom: 20px;
        }

        .dog-calculator-share-btn {
            padding: 12px 16px;
            border: none;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            color: white;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-family: inherit;
        }

        .dog-calculator-share-facebook { background: #1877f2; }
        .dog-calculator-share-facebook:hover { background: #1664d1; transform: translateY(-1px); }
        .dog-calculator-share-twitter { background: #1da1f2; }
        .dog-calculator-share-twitter:hover { background: #1991da; transform: translateY(-1px); }
        .dog-calculator-share-linkedin { background: #0a66c2; }
        .dog-calculator-share-linkedin:hover { background: #084d95; transform: translateY(-1px); }
        .dog-calculator-share-email { background: #6f3f6d; }
        .dog-calculator-share-email:hover { background: #5a3357; transform: translateY(-1px); }
        .dog-calculator-share-copy { background: #f19a5f; }
        .dog-calculator-share-copy:hover { background: #e87741; transform: translateY(-1px); }

        .dog-calculator-share-url {
            display: flex;
            width: 100%;
        }

        .dog-calculator-share-url input {
            flex: 1;
            width: 100%;
            padding: 10px 16px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 0.9rem;
            font-family: monospace;
            background: var(--bg-tertiary);
            color: var(--text-primary);
        }

        /* Embed Modal */
        .dog-calculator-embed-options {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .dog-calculator-embed-option {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            background: #fcfafd;
        }

        .dog-calculator-embed-option h4 {
            margin: 0 0 8px 0;
            color: var(--text-primary);
            font-size: 1.1rem;
        }

        .dog-calculator-embed-option p {
            margin: 0 0 16px 0;
            color: var(--text-label);
            font-size: 0.9rem;
        }

        /* Default (light theme) code containers */
        .dog-calculator-code-container {
            position: relative;
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            overflow: hidden;
        }

        .dog-calculator-code-container pre {
            margin: 0;
            padding: 16px 60px 16px 16px;
            overflow-x: auto;
        }

        .dog-calculator-code-container code {
            color: var(--text-primary);
            font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
            font-size: 0.85rem;
            line-height: 1.4;
        }

        .dog-calculator-copy-btn {
            position: absolute;
            top: 8px;
            right: 8px;
            padding: 6px 10px;
            background: #f19a5f;
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
            font-family: inherit;
            z-index: 1;
        }

        .dog-calculator-copy-btn:hover { background: #e87741; }
        .dog-calculator-copy-btn.copied { background: var(--success-color); }
        .dog-calculator-copy-btn.copied:hover { background: var(--success-color); }

        /* Dark theme modal styles */
        .dog-calculator-container.theme-dark .dog-calculator-modal-content {
            background-color: var(--bg-primary);
            border-color: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-modal h3 {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-modal-close {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-modal-close:hover {
            color: #f19a5f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-share-url input {
            background: var(--bg-secondary);
            border-color: var(--border-color);
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-embed-option {
            background: var(--bg-secondary);
            border-color: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-embed-option h4 {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-embed-option p {
            color: var(--text-secondary)
        }

        /* Dark theme code containers - different from embed option background */
        .dog-calculator-container.theme-dark .dog-calculator-code-container {
            background: #1a1621;
            border-color: #2a2330;
        }

        .dog-calculator-container.theme-dark .dog-calculator-code-container code {
            color: var(--text-primary);
        }

        /* System theme modal styles */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system .dog-calculator-modal-content {
                background-color: var(--bg-primary);
                border-color: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-modal h3 {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-modal-close {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-modal-close:hover {
                color: #f19a5f;
            }

            .dog-calculator-container.theme-system .dog-calculator-share-url input {
                background: var(--bg-secondary);
                border-color: var(--border-color);
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-embed-option {
                background: var(--bg-secondary);
                border-color: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-embed-option h4 {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-embed-option p {
                color: var(--text-secondary)
            }

            /* System theme code containers - different from embed option background */
            .dog-calculator-container.theme-system .dog-calculator-code-container {
                background: #1a1621;
                border-color: #2a2330;
            }

            .dog-calculator-container.theme-system .dog-calculator-code-container code {
                color: var(--text-primary);
            }
        }

        /* Multi-Food Source Styles */
        .dog-calculator-food-sources {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .dog-calculator-food-source-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            position: relative;
            transition: all 0.2s ease;
        }

        .dog-calculator-food-source-card:hover {
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }

        .dog-calculator-food-source-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 16px;
        }

        .dog-calculator-food-source-title {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 1.1rem;
            margin: 0;
        }

        .dog-calculator-remove-food-btn {
            background: var(--error-color);
            color: white;
            border: none;
            border-radius: 50%;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.2s ease;
            line-height: 1;
        }

        .dog-calculator-remove-food-btn:hover {
            background: #d65a47;
            transform: scale(1.1);
        }

        .dog-calculator-percentage-group {
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--border-color);
        }

        .dog-calculator-percentage-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-primary);
            font-size: 1rem;
        }

        .dog-calculator-percentage-input-group {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .dog-calculator-percentage-slider {
            flex: 1;
            height: 6px;
            border-radius: 3px;
            background: var(--border-color);
            outline: none;
            transition: all 0.2s ease;
            -webkit-appearance: none;
            appearance: none;
        }

        .dog-calculator-percentage-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #f19a5f;
            cursor: pointer;
            border: 2px solid white;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            transition: all 0.2s ease;
        }

        .dog-calculator-percentage-slider::-webkit-slider-thumb:hover {
            background: #e87741;
            transform: scale(1.1);
        }

        .dog-calculator-percentage-slider::-moz-range-thumb {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: #f19a5f;
            cursor: pointer;
            border: 2px solid white;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            transition: all 0.2s ease;
        }

        .dog-calculator-percentage-input {
            width: 70px;
            padding: 8px 12px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 0.9rem;
            text-align: center;
            background-color: var(--bg-secondary);
            color: var(--text-primary);
        }

        .dog-calculator-percentage-input:focus {
            outline: none;
            border-color: #f19a5f;
            box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.1);
        }

        .dog-calculator-add-food-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            width: 100%;
            padding: 16px;
            border: 2px dashed var(--border-color);
            border-radius: 8px;
            background: transparent;
            color: var(--text-label);
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
            font-family: inherit;
            margin-top: 16px;
        }

        .dog-calculator-add-food-btn:hover {
            border-color: #f19a5f;
            color: #f19a5f;
            background: rgba(241, 154, 95, 0.05);
        }

        .dog-calculator-add-food-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            border-color: var(--border-color);
            color: var(--text-label);
            background: transparent;
        }

        .dog-calculator-add-food-btn:disabled:hover {
            border-color: var(--border-color);
            color: var(--text-label);
            background: transparent;
        }

        .dog-calculator-food-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: 16px;
            margin-top: 20px;
        }

        .dog-calculator-food-result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
            font-size: 0.9rem;
        }

        .dog-calculator-food-result-item:last-child {
            margin-bottom: 0;
        }

        .dog-calculator-food-result-label {
            font-weight: 500;
            color: var(--text-primary);
        }

        .dog-calculator-food-result-value {
            font-weight: 600;
            color: var(--text-primary);
            padding: 2px 8px;
            background: rgba(241, 154, 95, 0.15);
            border-radius: 3px;
            font-size: 0.85rem;
        }

        /* Dark theme support for food sources */
        .dog-calculator-container.theme-dark .dog-calculator-food-source-card {
            background: var(--bg-secondary);
            border-color: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-food-source-title {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-percentage-label {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-percentage-slider {
            background: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-percentage-input {
            background: var(--border-color);
            border-color: #524a5f;
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-percentage-group {
            border-color: var(--border-color);
        }

        .dog-calculator-container.theme-dark .dog-calculator-add-food-btn {
            border-color: var(--border-color);
            color: var(--text-secondary)
        }

        .dog-calculator-container.theme-dark .dog-calculator-add-food-btn:hover {
            border-color: #f19a5f;
            color: #f19a5f;
            background: rgba(241, 154, 95, 0.1);
        }

        .dog-calculator-container.theme-dark .dog-calculator-food-results {
            background: linear-gradient(135deg, rgba(241, 154, 95, 0.15) 0%, rgba(241, 154, 95, 0.08) 100%);
            border-color: rgba(241, 154, 95, 0.3);
        }

        .dog-calculator-container.theme-dark .dog-calculator-food-result-label {
            color: var(--text-primary);
        }

        .dog-calculator-container.theme-dark .dog-calculator-food-result-value {
            color: var(--text-primary);
            background: rgba(241, 154, 95, 0.2);
        }

        /* System theme support for food sources */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system .dog-calculator-food-source-card {
                background: var(--bg-secondary);
                border-color: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-food-source-title {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-percentage-label {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-percentage-slider {
                background: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-percentage-input {
                background: var(--border-color);
                border-color: #524a5f;
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-percentage-group {
                border-color: var(--border-color);
            }

            .dog-calculator-container.theme-system .dog-calculator-add-food-btn {
                border-color: var(--border-color);
                color: var(--text-secondary)
            }

            .dog-calculator-container.theme-system .dog-calculator-add-food-btn:hover {
                border-color: #f19a5f;
                color: #f19a5f;
                background: rgba(241, 154, 95, 0.1);
            }

            .dog-calculator-container.theme-system .dog-calculator-food-results {
                background: linear-gradient(135deg, rgba(241, 154, 95, 0.15) 0%, rgba(241, 154, 95, 0.08) 100%);
                border-color: rgba(241, 154, 95, 0.3);
            }

            .dog-calculator-container.theme-system .dog-calculator-food-result-label {
                color: var(--text-primary);
            }

            .dog-calculator-container.theme-system .dog-calculator-food-result-value {
                color: var(--text-primary);
                background: rgba(241, 154, 95, 0.2);
            }
        }

        /* Mobile responsive design for food sources */
        @media (max-width: 576px) {
            .dog-calculator-food-source-card {
                padding: 16px;
            }

            .dog-calculator-food-source-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }

            .dog-calculator-remove-food-btn {
                align-self: flex-end;
                margin-top: -8px;
            }

            .dog-calculator-percentage-input-group {
                flex-direction: column;
                gap: 8px;
                align-items: stretch;
            }

            .dog-calculator-percentage-input {
                width: 100%;
            }

            .dog-calculator-add-food-btn {
                padding: 12px;
                font-size: 0.9rem;
            }

            .dog-calculator-food-result-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 4px;
            }

            .dog-calculator-food-result-value {
                align-self: stretch;
                text-align: center;
            }
        }

        /* Lock Icon Styles */
        .dog-calculator-lock-icon {
            display: inline-block;
            width: 16px;
            height: 16px;
            margin-left: 8px;
            cursor: pointer;
            font-size: 14px;
            line-height: 1;
            vertical-align: middle;
            transition: all 0.2s ease;
            user-select: none;
            opacity: 0.6;
        }

        .dog-calculator-lock-icon:hover {
            opacity: 1;
            transform: scale(1.1);
        }

        .dog-calculator-lock-icon.locked {
            color: #f19a5f;
            opacity: 1;
            font-weight: bold;
        }

        .dog-calculator-lock-icon.unlocked {
            color: var(--text-label);
        }

        .dog-calculator-lock-icon.disabled {
            opacity: 0.3;
            cursor: not-allowed;
        }

        .dog-calculator-lock-icon.disabled:hover {
            opacity: 0.3;
            transform: none;
        }

        /* Dark theme support for lock icons */
        .dog-calculator-container.theme-dark .dog-calculator-lock-icon.unlocked {
            color: var(--text-secondary)
        }

        .dog-calculator-container.theme-dark .dog-calculator-lock-icon.locked {
            color: #f19a5f;
        }

        /* System theme support for lock icons */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system .dog-calculator-lock-icon.unlocked {
                color: var(--text-secondary)
            }

            .dog-calculator-container.theme-system .dog-calculator-lock-icon.locked {
                color: #f19a5f;
            }
        }

        /* Disabled slider and input styles */
        .dog-calculator-percentage-slider:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            background: #f0f0f0;
            pointer-events: none;
        }

        .dog-calculator-percentage-slider:disabled::-webkit-slider-thumb {
            background: #ccc;
            cursor: not-allowed;
        }

        .dog-calculator-percentage-slider:disabled::-webkit-slider-thumb:hover {
            background: #ccc;
            transform: none;
        }

        .dog-calculator-percentage-slider:disabled::-moz-range-thumb {
            background: #ccc;
            cursor: not-allowed;
        }

        .dog-calculator-percentage-input:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            background-color: #f8f8f8;
            border-color: #ddd;
            pointer-events: none;
        }

        /* Dark theme disabled styles */
        .dog-calculator-container.theme-dark .dog-calculator-percentage-slider:disabled {
            background: #2a2530;
        }

        .dog-calculator-container.theme-dark .dog-calculator-percentage-input:disabled {
            background-color: #2a2530;
            border-color: #3a3442;
            color: #8a8a8a;
        }

        /* System theme disabled styles */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system .dog-calculator-percentage-slider:disabled {
                background: #2a2530;
            }

            .dog-calculator-container.theme-system .dog-calculator-percentage-input:disabled {
                background-color: #2a2530;
                border-color: #3a3442;
                color: #8a8a8a;
            }
        }

        /* Food Amount Breakdown Styling */
        .dog-calculator-food-amounts-section {
            margin-top: 1.5rem;
            padding: 1rem;
            background: var(--bg-secondary);
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }

        .dog-calculator-section-title {
            margin: 0 0 1rem 0;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .dog-calculator-food-amounts-list {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            margin-bottom: 1rem;
        }

        .dog-calculator-food-amount-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.75rem;
            background: var(--bg-primary);
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }

        .dog-calculator-food-amount-label {
            font-weight: 500;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .dog-calculator-food-percentage {
            background: var(--primary-color);
            color: white;
            padding: 0.2rem 0.5rem;
            border-radius: 12px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .dog-calculator-lock-indicator {
            font-size: 0.8rem;
            opacity: 0.7;
        }

        .dog-calculator-food-amount-value {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 1rem;
        }

        /* Warning styles for missing energy content */
        .dog-calculator-warning {
            color: #e11d48;
            font-weight: 500;
            font-size: 1.2rem;
            text-align: left;
            cursor: help;
        }

        /* Inline unit selector in results */
        .dog-calculator-inline-unit {
            margin-left: 12px;
            min-width: 110px;
            padding: 4px 8px;
            background: var(--bg-primary);
            border: 1px solid rgba(241, 154, 95, 0.4);
            border-radius: 6px;
            color: var(--text-primary);
            font-size: 0.9rem;
            font-weight: 500;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            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 8px center;
            background-size: 16px;
            padding-right: 32px;
        }

        .dog-calculator-inline-unit:hover {
            border-color: #f19a5f;
            box-shadow: 0 2px 6px rgba(241, 154, 95, 0.2);
        }

        .dog-calculator-inline-unit:focus {
            outline: none;
            border-color: #f19a5f;
            box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.1);
        }

        /* Inline days input in breakdown header */
        .dog-calculator-inline-days {
            width: 60px;
            padding: 2px 6px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            text-align: center;
            font-size: inherit;
            font-family: inherit;
            margin: 0 4px;
        }

        /* Unit selection buttons */
        .dog-calculator-unit-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin: 24px auto;
            flex-wrap: wrap;
            width: fit-content;
        }

        .dog-calculator-unit-btn {
            padding: 8px 14px;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            background: var(--bg-primary);
            color: var(--text-primary);
            font-size: 0.9rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
            min-width: 50px;
            text-align: center;
        }

        .dog-calculator-unit-btn:hover {
            border-color: #f19a5f;
            background: rgba(241, 154, 95, 0.1);
        }

        .dog-calculator-unit-btn.active {
            border-color: #f19a5f;
            background: #f19a5f;
            color: white;
        }

        /* Hidden unit select for compatibility */
        .dog-calculator-unit-select-hidden {
            display: none;
        }

        /* Mobile responsive adjustments for inline unit selector */
        @media (max-width: 576px) {
            .dog-calculator-result-item {
                display: flex;
                flex-direction: column;
                align-items: center;
                gap: 8px;
            }

            .dog-calculator-result-label {
                width: 100%;
                text-align: center;
                margin-bottom: 4px;
            }

            .dog-calculator-result-value {
                display: inline-block;
            }

            .dog-calculator-inline-unit {
                display: inline-block;
                margin-left: 8px;
                min-width: 90px;
                vertical-align: middle;
            }

            /* Center the breakdown header on mobile */
            .dog-calculator-section-title {
                text-align: center;
            }

            /* Ensure food breakdown items stay on one line */
            .dog-calculator-food-amount-item {
                display: flex;
                justify-content: space-between;
                align-items: center;
                flex-wrap: nowrap;
                text-align: left;
            }

            .dog-calculator-food-amount-label {
                flex: 1;
                min-width: 0;
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
                text-align: left;
            }

            .dog-calculator-food-amount-value {
                flex-shrink: 0;
                margin-left: 8px;
                text-align: right;
            }
        }

        .dog-calculator-total-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem;
            background: var(--primary-color);
            color: white;
            border-radius: 6px;
            font-weight: 600;
            margin-top: 0.5rem;
        }

        .dog-calculator-total-label {
            font-size: 1rem;
        }

        .dog-calculator-total-value {
            font-size: 1.1rem;
            font-weight: 700;
        }

        .dog-calculator-full-width {
            flex: 1;
        }

        /* Editable Food Source Name Styling */
        .dog-calculator-food-source-name-input {
            background: transparent;
            border: 2px solid transparent;
            color: var(--text-primary);
            font-size: 1.1rem;
            font-weight: 600;
            font-family: inherit;
            padding: 0.5rem 0;
            border-radius: 4px;
            width: 100%;
            outline: none;
            transition: all 0.2s ease;
            cursor: text;
        }

        .dog-calculator-food-source-name-input:hover {
            border-color: var(--border-color);
            background: var(--bg-secondary);
            padding: 0.5rem;
        }

        .dog-calculator-food-source-name-input:focus {
            border-color: var(--primary-color);
            background: var(--bg-primary);
            box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.1);
            padding: 0.5rem;
        }

        .dog-calculator-food-source-name-input::placeholder {
            color: var(--text-secondary);
            opacity: 0.7;
        }

        /* Dark theme adjustments */
        .dog-calculator-container.theme-dark .dog-calculator-food-source-name-input:hover {
            background: #2a2530;
        }

        .dog-calculator-container.theme-dark .dog-calculator-food-source-name-input:focus {
            background: #1e1a24;
        }

        /* System theme adjustments */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system .dog-calculator-food-source-name-input:hover {
                background: #2a2530;
            }

            .dog-calculator-container.theme-system .dog-calculator-food-source-name-input:focus {
                background: #1e1a24;
            }
        }

        /* Responsive adjustments */
        @media (max-width: 576px) {
            .dog-calculator-food-amount-item {
                flex-direction: row !important;
                gap: 0.5rem;
                text-align: left !important;
                justify-content: space-between !important;
                align-items: center !important;
                flex-wrap: nowrap !important;
            }

            .dog-calculator-food-amount-label {
                justify-content: flex-start !important;
                text-align: left !important;
                flex: 1;
                min-width: 0;
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
            }

            .dog-calculator-food-amount-value {
                flex-shrink: 0;
                margin-left: 8px;
                text-align: right !important;
            }

            .dog-calculator-food-source-name-input {
                font-size: 1rem;
            }

        }`;
    
    function injectStyles() {
        if (document.getElementById('dog-calculator-styles')) return;
        
        const style = document.createElement('style');
        style.id = 'dog-calculator-styles';
        style.textContent = CSS_STYLES;
        document.head.appendChild(style);
    }
    
    // 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
         */

        class DogCalorieCalculatorWidget {
            constructor(container, options = {}) {
            this.container = container;
            this.options = {
                theme: options.theme || this.getThemeFromURL() || 'system',
                scale: options.scale || this.getScaleFromURL() || 1.0,
                ...options
            };
            this.theme = this.options.theme;
            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 = CALCULATOR_CONFIG.maxFoodSources;
                this.init();
            }

            init() {
            // Inject the calculator HTML into the container
            this.container.innerHTML = `<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>`;
            
            // Apply widget-specific settings
            this.applyTheme();
            this.applyScale();
            
            // Continue with original init logic
                this.applyTheme();
                this.applyScale();
                this.initializeFoodSources();
                this.bindEvents();
                this.updateUnitLabels();
                this.setupIframeResize();
                
                // Show the calculator with fade-in
                const container = this.container.querySelector('#dogCalculator');
                container.classList.add('loaded');
            }

            getThemeFromURL() {
                const urlParams = new URLSearchParams(window.location.search);
                const theme = urlParams.get('theme');
                return ['light', 'dark', 'system'].includes(theme) ? theme : null;
            }

            getScaleFromURL() {
                const urlParams = new URLSearchParams(window.location.search);
                const scale = parseFloat(urlParams.get('scale'));
                return (!isNaN(scale) && scale >= CALCULATOR_CONFIG.minScale && scale <= CALCULATOR_CONFIG.maxScale) ? scale : null;
            }

            applyTheme() {
                const container = this.container.querySelector('#dogCalculator');
                container.classList.remove('theme-light', 'theme-dark', 'theme-system');
                container.classList.add('theme-' + this.theme);
            }

            applyScale() {
                const container = this.container.querySelector('#dogCalculator');
                if (!container) return;

                // 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})`;
                    container.style.transformOrigin = 'top center';
                    
                    // Adjust container to account for scaling
                    setTimeout(() => {
                        const actualHeight = container.offsetHeight * clampedScale;
                        container.style.marginBottom = `${(clampedScale - 1) * container.offsetHeight}px`;
                        this.sendHeightToParent();
                    }, 100);
                }
            }

            // Food Source Management Methods
            initializeFoodSources() {
                this.addFoodSource();
                this.updateAddButton();
            }

            addFoodSource() {
                if (this.foodSources.length >= this.maxFoodSources) {
                    return;
                }

                const id = this.generateFoodSourceId();
                const foodSource = {
                    id: id,
                    name: `Food Source ${this.foodSources.length + 1}`,
                    energy: '',
                    energyUnit: this.isImperial ? 'kcalcup' : 'kcal100g',
                    percentage: this.foodSources.length === 0 ? 100 : 0,
                    isLocked: false
                };

                this.foodSources.push(foodSource);
                this.redistributePercentages();
                this.renderFoodSource(foodSource);
                this.updateAddButton();
                this.updateRemoveButtons();
                this.refreshAllPercentageUI();
            }

            removeFoodSource(id) {
                if (this.foodSources.length <= 1) {
                    return; // Cannot remove the last food source
                }

                const index = this.foodSources.findIndex(fs => fs.id === id);
                if (index === -1) return;

                this.foodSources.splice(index, 1);
                
                // Remove the DOM element
                const element = document.getElementById(`foodSource-${id}`);
                if (element) {
                    element.remove();
                }

                // Redistribute percentages among remaining sources
                this.redistributePercentages();
                this.updateFoodSourceNames();
                this.updateAddButton();
                this.updateRemoveButtons();
                this.refreshAllPercentageUI();
            }

            generateFoodSourceId() {
                return 'fs_' + Date.now() + '_' + Math.random().toString(36).substr(2, 5);
            }

            redistributePercentages() {
                const count = this.foodSources.length;
                if (count === 0) return;

                // Only redistribute among unlocked sources
                const unlockedSources = this.foodSources.filter(fs => !fs.isLocked);
                const lockedSources = this.foodSources.filter(fs => fs.isLocked);
                
                // Calculate total locked percentage
                const totalLockedPercentage = lockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                
                // Available percentage for unlocked sources
                const availablePercentage = 100 - totalLockedPercentage;
                
                if (unlockedSources.length > 0) {
                    const equalPercentage = Math.floor(availablePercentage / unlockedSources.length);
                    const remainder = availablePercentage - (equalPercentage * unlockedSources.length);

                    unlockedSources.forEach((fs, index) => {
                        fs.percentage = equalPercentage + (index < remainder ? 1 : 0);
                    });
                }

                // Update the UI sliders and inputs
                this.refreshAllPercentageUI();
            }

            // OBSOLETE METHODS - Replaced by new validation system
            // Keeping for reference but these are no longer used
            
            /*
            updatePercentageInputs() {
                this.foodSources.forEach(fs => {
                    const slider = document.getElementById(`percentage-slider-${fs.id}`);
                    const input = document.getElementById(`percentage-input-${fs.id}`);
                    const display = document.getElementById(`percentage-display-${fs.id}`);
                    
                    if (slider) slider.value = fs.percentage;
                    if (input) input.value = fs.percentage;
                    if (display) display.textContent = `${fs.percentage}%`;
                });
                
                // Update constraints after values are set
                this.updatePercentageConstraints();
            }

            updatePercentageConstraints() {
                this.foodSources.forEach(fs => {
                    const slider = document.getElementById(`percentage-slider-${fs.id}`);
                    const input = document.getElementById(`percentage-input-${fs.id}`);
                    
                    if (!slider || !input) return;
                    
                    // Always keep full 0-100 scale for all sliders
                    slider.max = 100;
                    input.max = 100;
                    
                    if (fs.isLocked) {
                        // Locked sources can't be changed
                        slider.disabled = true;
                        input.disabled = true;
                    } else {
                        // Calculate the maximum this source can have
                        const lockedSources = this.foodSources.filter(other => other.id !== fs.id && other.isLocked);
                        const totalLockedPercentage = lockedSources.reduce((sum, other) => sum + other.percentage, 0);
                        const maxAllowed = 100 - totalLockedPercentage;
                        
                        // Re-enable 
                        slider.disabled = false;
                        input.disabled = false;
                        
                        // Store max allowed for validation (we'll check this in event handlers)
                        slider.dataset.maxAllowed = maxAllowed;
                        input.dataset.maxAllowed = maxAllowed;
                        
                        // If current value exceeds max, adjust it
                        if (fs.percentage > maxAllowed) {
                            fs.percentage = maxAllowed;
                            slider.value = maxAllowed;
                            input.value = maxAllowed;
                            document.getElementById(`percentage-display-${fs.id}`).textContent = `${maxAllowed}%`;
                        }
                    }
                });
            }

            adjustPercentages(changedId, newPercentage) {
                const changedIndex = this.foodSources.findIndex(fs => fs.id === changedId);
                if (changedIndex === -1) return;

                const oldPercentage = this.foodSources[changedIndex].percentage;
                const difference = newPercentage - oldPercentage;
                
                this.foodSources[changedIndex].percentage = newPercentage;

                // Only redistribute among unlocked sources (excluding the changed one)
                const otherUnlockedSources = this.foodSources.filter((fs, index) => 
                    index !== changedIndex && !fs.isLocked
                );
                
                // If this is the only unlocked source, force it to fill remaining percentage
                if (otherUnlockedSources.length === 0) {
                    const lockedSources = this.foodSources.filter((fs, index) => 
                        index !== changedIndex && fs.isLocked
                    );
                    const totalLockedPercentage = lockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                    const requiredPercentage = 100 - totalLockedPercentage;
                    
                    // Force the changed source to the required percentage
                    this.foodSources[changedIndex].percentage = requiredPercentage;
                    this.updatePercentageInputs();
                    this.updateFoodCalculations();
                    return;
                }

                // Calculate total locked percentage (excluding the changed source)
                const lockedSources = this.foodSources.filter((fs, index) => 
                    index !== changedIndex && fs.isLocked
                );
                const totalLockedPercentage = lockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                
                // Available percentage for unlocked sources
                const availablePercentage = 100 - newPercentage - totalLockedPercentage;
                
                const totalUnlockedPercentage = otherUnlockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                
                if (totalUnlockedPercentage === 0) {
                    // If all other unlocked sources are 0, distribute equally
                    const equalShare = Math.floor(availablePercentage / otherUnlockedSources.length);
                    const remainder = availablePercentage - (equalShare * otherUnlockedSources.length);
                    
                    otherUnlockedSources.forEach((fs, index) => {
                        fs.percentage = equalShare + (index < remainder ? 1 : 0);
                    });
                } else {
                    // Distribute proportionally among unlocked sources
                    const scale = availablePercentage / totalUnlockedPercentage;
                    
                    let distributedTotal = 0;
                    otherUnlockedSources.forEach((fs, index) => {
                        if (index === otherUnlockedSources.length - 1) {
                            // Last item gets the remainder to ensure exact 100%
                            fs.percentage = availablePercentage - distributedTotal;
                        } else {
                            fs.percentage = Math.round(fs.percentage * scale);
                            distributedTotal += fs.percentage;
                        }
                    });
                }

                this.updatePercentageInputs();
                this.updateFoodCalculations();
            }
            */

            // New validation system methods
            validatePercentageChange(sourceId, requestedValue) {
                // Find the source being changed
                const changedSource = this.foodSources.find(fs => fs.id === sourceId);
                if (!changedSource) {
                    return { isValid: false, reason: 'Source not found' };
                }

                // If the source is locked, no change allowed
                if (changedSource.isLocked) {
                    return { isValid: false, reason: 'Source is locked' };
                }

                // Ensure requested value is within bounds
                const clampedValue = Math.max(0, Math.min(100, requestedValue));

                // Calculate locked and other unlocked totals
                const lockedSources = this.foodSources.filter(fs => fs.id !== sourceId && fs.isLocked);
                const otherUnlockedSources = this.foodSources.filter(fs => fs.id !== sourceId && !fs.isLocked);
                
                const totalLocked = lockedSources.reduce((sum, fs) => sum + fs.percentage, 0);

                // Check if the only unlocked source
                if (otherUnlockedSources.length === 0) {
                    // This is the only unlocked source, must fill remaining percentage
                    const requiredPercentage = 100 - totalLocked;
                    return {
                        isValid: true,
                        actualValue: requiredPercentage,
                        affectedSources: [{ id: sourceId, newPercentage: requiredPercentage }],
                        reason: 'Only unlocked source, forced to fill remainder'
                    };
                }

                // Calculate available percentage for redistribution
                const availableForOthers = 100 - clampedValue - totalLocked;
                
                // Check if redistribution is possible
                if (availableForOthers < 0) {
                    // Cannot accommodate this value
                    const maxAllowed = 100 - totalLocked;
                    return {
                        isValid: true,
                        actualValue: maxAllowed,
                        affectedSources: this.calculateRedistribution(sourceId, maxAllowed, otherUnlockedSources),
                        reason: 'Value clamped to maximum allowed'
                    };
                }

                // Calculate redistribution
                const affectedSources = this.calculateRedistribution(sourceId, clampedValue, otherUnlockedSources);
                
                return {
                    isValid: true,
                    actualValue: clampedValue,
                    affectedSources: affectedSources,
                    reason: 'Valid change'
                };
            }

            calculateRedistribution(sourceId, newValue, otherUnlockedSources) {
                const result = [{ id: sourceId, newPercentage: newValue }];
                
                if (otherUnlockedSources.length === 0) {
                    return result;
                }

                // Calculate total locked percentage
                const lockedSources = this.foodSources.filter(fs => fs.id !== sourceId && fs.isLocked);
                const totalLocked = lockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                
                // Available percentage for other unlocked sources
                const availableForOthers = 100 - newValue - totalLocked;
                
                // Current total of other unlocked sources
                const currentOtherTotal = otherUnlockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                
                if (currentOtherTotal === 0 || availableForOthers === 0) {
                    // Distribute equally among other unlocked sources
                    const equalShare = Math.floor(availableForOthers / otherUnlockedSources.length);
                    const remainder = availableForOthers - (equalShare * otherUnlockedSources.length);
                    
                    otherUnlockedSources.forEach((fs, index) => {
                        const newPercentage = equalShare + (index < remainder ? 1 : 0);
                        result.push({ id: fs.id, newPercentage });
                    });
                } else {
                    // Distribute proportionally
                    const scale = availableForOthers / currentOtherTotal;
                    let distributedTotal = 0;
                    
                    otherUnlockedSources.forEach((fs, index) => {
                        let newPercentage;
                        if (index === otherUnlockedSources.length - 1) {
                            // Last item gets remainder to ensure exact total
                            newPercentage = availableForOthers - distributedTotal;
                        } else {
                            newPercentage = Math.round(fs.percentage * scale);
                            distributedTotal += newPercentage;
                        }
                        result.push({ id: fs.id, newPercentage });
                    });
                }
                
                return result;
            }

            applyValidatedChanges(validationResult) {
                if (!validationResult.isValid) {
                    return false;
                }
                
                // Apply all percentage changes
                validationResult.affectedSources.forEach(change => {
                    const source = this.foodSources.find(fs => fs.id === change.id);
                    if (source) {
                        source.percentage = change.newPercentage;
                    }
                });
                
                return true;
            }

            refreshAllPercentageUI() {
                this.foodSources.forEach(fs => {
                    // Update all UI elements from single source of truth
                    const slider = document.getElementById(`percentage-slider-${fs.id}`);
                    const input = document.getElementById(`percentage-input-${fs.id}`);
                    const display = document.getElementById(`percentage-display-${fs.id}`);
                    
                    if (slider) slider.value = fs.percentage;
                    if (input) input.value = fs.percentage;
                    if (display) display.textContent = `${fs.percentage}%`;
                    
                    // Update constraints and disabled states
                    this.updateSliderConstraints(fs);
                });
                
                // Update food calculations
                this.updateFoodCalculations();
            }

            updateSliderConstraints(foodSource) {
                const slider = document.getElementById(`percentage-slider-${foodSource.id}`);
                const input = document.getElementById(`percentage-input-${foodSource.id}`);
                
                if (!slider || !input) return;
                
                // Always keep 0-100 scale
                slider.max = 100;
                input.max = 100;
                
                if (foodSource.isLocked) {
                    slider.disabled = true;
                    input.disabled = true;
                } else {
                    // Calculate maximum allowed and store for validation
                    const maxAllowed = this.calculateMaxAllowed(foodSource.id);
                    slider.disabled = (maxAllowed <= 0);
                    input.disabled = (maxAllowed <= 0);
                    slider.dataset.maxAllowed = maxAllowed;
                    input.dataset.maxAllowed = maxAllowed;
                }
            }

            calculateMaxAllowed(sourceId) {
                const lockedSources = this.foodSources.filter(fs => fs.id !== sourceId && fs.isLocked);
                const otherUnlockedSources = this.foodSources.filter(fs => fs.id !== sourceId && !fs.isLocked);
                
                const totalLocked = lockedSources.reduce((sum, fs) => sum + fs.percentage, 0);
                
                // If this is the only unlocked source, it must take up the remainder
                if (otherUnlockedSources.length === 0) {
                    return 100 - totalLocked;
                }
                
                // Otherwise, maximum is 100 minus locked percentages
                return Math.max(0, 100 - totalLocked);
            }

            updateFoodSourceNames() {
                this.foodSources.forEach((fs, index) => {
                    // Only update if the name is still the default pattern
                    if (fs.name.match(/^Food Source \d+$/)) {
                        fs.name = `Food Source ${index + 1}`;
                        const titleElement = document.getElementById(`food-title-${fs.id}`);
                        if (titleElement) {
                            titleElement.value = fs.name;
                        }
                    }
                });
            }

            updateAddButton() {
                const addBtn = this.container.querySelector('#addFoodBtn');
                
                if (addBtn) {
                    const remaining = this.maxFoodSources - this.foodSources.length;
                    const buttonText = addBtn.querySelector('span:last-child');
                    
                    if (remaining <= 0) {
                        // Disable button and show max reached message
                        addBtn.disabled = true;
                        if (buttonText) {
                            buttonText.textContent = `Maximum ${this.maxFoodSources} sources reached`;
                        }
                    } else {
                        // Enable button with normal text
                        addBtn.disabled = false;
                        if (buttonText) {
                            buttonText.textContent = 'Add another food source';
                        }
                    }
                }
            }

            updateRemoveButtons() {
                // Show/hide remove buttons based on whether we have more than one source
                const hasMultipleSources = this.foodSources.length > 1;
                
                this.foodSources.forEach(fs => {
                    const removeBtn = document.getElementById(`remove-${fs.id}`);
                    if (removeBtn) {
                        removeBtn.style.display = hasMultipleSources ? 'block' : 'none';
                    }
                });
            }

            renderFoodSource(foodSource) {
                const container = this.container.querySelector('#foodSources');
                if (!container) return;

                const cardHTML = `
                    <div class="dog-calculator-food-source-card" id="foodSource-${foodSource.id}">
                        <div class="dog-calculator-food-source-header">
                            <input type="text" class="dog-calculator-food-source-name-input" id="food-title-${foodSource.id}" value="${foodSource.name}" placeholder="Enter food name" maxlength="50" title="Click to edit food source name">
                            <button class="dog-calculator-remove-food-btn" id="remove-${foodSource.id}" type="button" title="Remove this food source" style="display: ${this.foodSources.length > 1 ? 'block' : 'none'}">×</button>
                        </div>
                        
                        <div class="dog-calculator-input-group">
                            <div class="dog-calculator-form-group">
                                <label for="energy-${foodSource.id}">Energy Content:</label>
                                <input type="number" id="energy-${foodSource.id}" min="1" step="1" placeholder="Enter energy content" value="${foodSource.energy}">
                            </div>
                            <div class="dog-calculator-form-group">
                                <label for="energy-unit-${foodSource.id}">Unit:</label>
                                <select id="energy-unit-${foodSource.id}" class="dog-calculator-unit-select">
                                    <option value="kcal100g" ${foodSource.energyUnit === 'kcal100g' ? 'selected' : ''}>kcal/100g</option>
                                    <option value="kcalkg" ${foodSource.energyUnit === 'kcalkg' ? 'selected' : ''}>kcal/kg</option>
                                    <option value="kcalcup" ${foodSource.energyUnit === 'kcalcup' ? 'selected' : ''}>kcal/cup</option>
                                    <option value="kcalcan" ${foodSource.energyUnit === 'kcalcan' ? 'selected' : ''}>kcal/can</option>
                                </select>
                            </div>
                        </div>
                        <div id="energy-error-${foodSource.id}" class="dog-calculator-error dog-calculator-hidden">Please enter a valid energy content</div>

                        <div class="dog-calculator-percentage-group">
                            <label class="dog-calculator-percentage-label" for="percentage-slider-${foodSource.id}">
                                Percentage of Diet: <span id="percentage-display-${foodSource.id}">${foodSource.percentage}%</span>
                                <span class="dog-calculator-lock-icon unlocked" id="lock-${foodSource.id}" title="Lock this percentage">🔒</span>
                            </label>
                            <div class="dog-calculator-percentage-input-group">
                                <input type="range" id="percentage-slider-${foodSource.id}" class="dog-calculator-percentage-slider" 
                                       min="0" max="100" value="${foodSource.percentage}">
                                <input type="number" id="percentage-input-${foodSource.id}" class="dog-calculator-percentage-input" 
                                       min="0" max="100" value="${foodSource.percentage}">
                            </div>
                        </div>
                    </div>
                `;

                container.insertAdjacentHTML('beforeend', cardHTML);
                
                // Bind events for the new food source
                this.bindFoodSourceEvents(foodSource.id);
            }

            bindFoodSourceEvents(id) {
                // Name input events
                const nameInput = document.getElementById(`food-title-${id}`);
                
                // Energy input events
                const energyInput = document.getElementById(`energy-${id}`);
                const energyUnitSelect = document.getElementById(`energy-unit-${id}`);
                const percentageSlider = document.getElementById(`percentage-slider-${id}`);
                const percentageInput = document.getElementById(`percentage-input-${id}`);
                const removeBtn = document.getElementById(`remove-${id}`);
                const lockBtn = document.getElementById(`lock-${id}`);

                if (nameInput) {
                    nameInput.addEventListener('input', () => {
                        const newName = nameInput.value.trim() || `Food Source ${this.foodSources.findIndex(fs => fs.id === id) + 1}`;
                        this.updateFoodSourceData(id, 'name', newName);
                        this.updateFoodCalculations(); // This will refresh the food amount breakdown with new names
                    });
                    
                    nameInput.addEventListener('blur', () => {
                        // If field is empty, restore default name
                        if (!nameInput.value.trim()) {
                            const defaultName = `Food Source ${this.foodSources.findIndex(fs => fs.id === id) + 1}`;
                            nameInput.value = defaultName;
                            this.updateFoodSourceData(id, 'name', defaultName);
                            this.updateFoodCalculations();
                        }
                    });
                }

                if (energyInput) {
                    energyInput.addEventListener('input', () => {
                        this.updateFoodSourceData(id, 'energy', energyInput.value);
                        this.updateFoodCalculations();
                    });
                    energyInput.addEventListener('blur', () => this.validateFoodSourceEnergy(id));
                }

                if (energyUnitSelect) {
                    energyUnitSelect.addEventListener('change', () => {
                        this.updateFoodSourceData(id, 'energyUnit', energyUnitSelect.value);
                        this.updateFoodCalculations();
                    });
                }

                if (percentageSlider) {
                    percentageSlider.addEventListener('input', () => {
                        const requestedValue = parseInt(percentageSlider.value);
                        const result = this.validatePercentageChange(id, requestedValue);
                        
                        if (result.isValid) {
                            this.applyValidatedChanges(result);
                        }
                        // Always refresh to ensure valid state
                        this.refreshAllPercentageUI();
                    });
                }

                if (percentageInput) {
                    percentageInput.addEventListener('change', () => {
                        const requestedValue = parseInt(percentageInput.value) || 0;
                        const result = this.validatePercentageChange(id, requestedValue);
                        
                        if (result.isValid) {
                            this.applyValidatedChanges(result);
                        }
                        this.refreshAllPercentageUI();
                    });
                }

                if (removeBtn) {
                    removeBtn.addEventListener('click', () => this.removeFoodSource(id));
                }

                if (lockBtn) {
                    lockBtn.addEventListener('click', () => this.toggleLock(id));
                }
            }

            toggleLock(id) {
                const foodSource = this.foodSources.find(fs => fs.id === id);
                if (!foodSource) return;

                // Check if we're trying to lock the last unlocked source
                const unlockedSources = this.foodSources.filter(fs => !fs.isLocked);
                if (unlockedSources.length === 1 && unlockedSources[0].id === id) {
                    // Cannot lock the last unlocked source
                    alert('At least one food source must remain flexible for percentage adjustments.');
                    return;
                }

                // Toggle lock state
                foodSource.isLocked = !foodSource.isLocked;
                this.updateLockIcon(id);
                this.updateLockStates();
                this.refreshAllPercentageUI();
            }

            updateLockIcon(id) {
                const foodSource = this.foodSources.find(fs => fs.id === id);
                const lockIcon = document.getElementById(`lock-${id}`);
                
                if (!lockIcon || !foodSource) return;

                if (foodSource.isLocked) {
                    lockIcon.classList.remove('unlocked');
                    lockIcon.classList.add('locked');
                    lockIcon.title = 'Unlock this percentage';
                } else {
                    lockIcon.classList.remove('locked');
                    lockIcon.classList.add('unlocked');
                    lockIcon.title = 'Lock this percentage';
                }
            }

            updateLockStates() {
                const unlockedSources = this.foodSources.filter(fs => !fs.isLocked);
                
                // Update lock icon states - disable lock for last unlocked source
                this.foodSources.forEach(fs => {
                    const lockIcon = document.getElementById(`lock-${fs.id}`);
                    if (lockIcon) {
                        if (!fs.isLocked && unlockedSources.length === 1) {
                            lockIcon.classList.add('disabled');
                            lockIcon.title = 'Cannot lock - at least one source must remain flexible';
                        } else {
                            lockIcon.classList.remove('disabled');
                            lockIcon.title = fs.isLocked ? 'Unlock this percentage' : 'Lock this percentage';
                        }
                    }
                });
                
                // Update percentage constraints based on lock states
                this.refreshAllPercentageUI();
            }

            updateFoodSourceData(id, field, value) {
                const foodSource = this.foodSources.find(fs => fs.id === id);
                if (foodSource) {
                    foodSource[field] = value;
                }
            }

            validateFoodSourceEnergy(id) {
                const energyInput = document.getElementById(`energy-${id}`);
                const energyUnitSelect = document.getElementById(`energy-unit-${id}`);
                const errorElement = document.getElementById(`energy-error-${id}`);
                
                if (!energyInput || !energyUnitSelect || !errorElement) return;
                
                const energy = parseFloat(energyInput.value);
                const unit = energyUnitSelect.value;
                
                let minValue = 1;
                switch (unit) {
                    case 'kcal100g': minValue = 1; break;
                    case 'kcalkg': minValue = 10; break;
                    case 'kcalcup': minValue = 50; break;
                    case 'kcalcan': minValue = 100; break;
                }
                
                if (!this.validateInput(energy, minValue)) {
                    errorElement.classList.remove('dog-calculator-hidden');
                } else {
                    errorElement.classList.add('dog-calculator-hidden');
                }
            }

            bindEvents() {
                const weightInput = this.container.querySelector('#weight');
                const dogTypeSelect = this.container.querySelector('#dogType');
                const daysInput = this.container.querySelector('#days');
                const unitSelect = this.container.querySelector('#unit');
                const unitToggle = this.container.querySelector('#unitToggle');
                const addFoodBtn = this.container.querySelector('#addFoodBtn');

                if (weightInput) {
                    weightInput.addEventListener('input', () => this.updateCalorieCalculations());
                    weightInput.addEventListener('blur', () => this.validateWeight());
                }
                
                if (dogTypeSelect) dogTypeSelect.addEventListener('change', () => this.updateCalorieCalculations());
                
                if (daysInput) {
                    daysInput.addEventListener('input', () => {
                        this.updateDayLabel();
                        this.updateFoodCalculations();
                    });
                    daysInput.addEventListener('blur', () => this.validateDays());
                }
                
                if (unitSelect) unitSelect.addEventListener('change', () => this.updateFoodCalculations());

                // Unit button event listeners
                const unitButtons = this.container.querySelectorAll('.dog-calculator-unit-btn');
                unitButtons.forEach(button => {
                    button.addEventListener('click', (e) => {
                        const selectedUnit = e.target.dataset.unit;
                        this.setActiveUnitButton(selectedUnit);
                        // Update hidden select to trigger existing logic
                        if (unitSelect) {
                            unitSelect.value = selectedUnit;
                            this.updateFoodCalculations();
                        }
                    });
                });
                
                if (unitToggle) unitToggle.addEventListener('change', () => this.toggleUnits());

                if (addFoodBtn) addFoodBtn.addEventListener('click', () => this.addFoodSource());

                // Modal event listeners
                const shareBtn = this.container.querySelector('#shareBtn');
                const embedBtn = this.container.querySelector('#embedBtn');
                const shareModalClose = this.container.querySelector('#shareModalClose');
                const embedModalClose = this.container.querySelector('#embedModalClose');

                if (shareBtn) shareBtn.addEventListener('click', () => this.showShareModal());
                if (embedBtn) embedBtn.addEventListener('click', () => this.showEmbedModal());
                if (shareModalClose) shareModalClose.addEventListener('click', () => this.hideShareModal());
                if (embedModalClose) embedModalClose.addEventListener('click', () => this.hideEmbedModal());

                // Share buttons
                const shareFacebook = this.container.querySelector('#shareFacebook');
                const shareTwitter = this.container.querySelector('#shareTwitter');
                const shareLinkedIn = this.container.querySelector('#shareLinkedIn');
                const shareEmail = this.container.querySelector('#shareEmail');
                const shareCopy = this.container.querySelector('#shareCopy');

                if (shareFacebook) shareFacebook.addEventListener('click', () => this.shareToFacebook());
                if (shareTwitter) shareTwitter.addEventListener('click', () => this.shareToTwitter());
                if (shareLinkedIn) shareLinkedIn.addEventListener('click', () => this.shareToLinkedIn());
                if (shareEmail) shareEmail.addEventListener('click', () => this.shareViaEmail());
                if (shareCopy) shareCopy.addEventListener('click', () => this.copyShareLink());

                // Copy buttons
                const copyWidget = this.container.querySelector('#copyWidget');
                const copyIframe = this.container.querySelector('#copyIframe');

                if (copyWidget) copyWidget.addEventListener('click', () => this.copyEmbedCode('widget'));
                if (copyIframe) copyIframe.addEventListener('click', () => this.copyEmbedCode('iframe'));

                // Close modals on outside click
                const shareModal = this.container.querySelector('#shareModal');
                const embedModal = this.container.querySelector('#embedModal');

                if (shareModal) {
                    shareModal.addEventListener('click', (e) => {
                        if (e.target === shareModal) this.hideShareModal();
                    });
                }

                if (embedModal) {
                    embedModal.addEventListener('click', (e) => {
                        if (e.target === embedModal) this.hideEmbedModal();
                    });
                }
            }

            toggleUnits() {
                const toggle = this.container.querySelector('#unitToggle');
                this.isImperial = toggle.checked;
                
                this.updateUnitLabels();
                this.convertExistingValues();
                this.updateCalorieCalculations();
            }

            updateUnitLabels() {
                const metricLabel = this.container.querySelector('#metricLabel');
                const imperialLabel = this.container.querySelector('#imperialLabel');
                const weightLabel = this.container.querySelector('#weightLabel');
                const weightInput = this.container.querySelector('#weight');
                const unitSelect = this.container.querySelector('#unit');

                if (metricLabel && imperialLabel) {
                    metricLabel.classList.toggle('active', !this.isImperial);
                    imperialLabel.classList.toggle('active', this.isImperial);
                }

                if (this.isImperial) {
                    if (weightLabel) weightLabel.textContent = "Dog's Weight (lbs):";
                    if (weightInput) {
                        weightInput.placeholder = "Enter weight in lbs";
                        weightInput.min = "0.2";
                        weightInput.step = "0.1";
                    }
                    if (unitSelect) {
                        unitSelect.innerHTML = '<option value="oz">ounces (oz)</option>' +
                            '<option value="lb">pounds (lb)</option>' +
                            '<option value="g">grams (g)</option>' +
                            '<option value="kg">kilograms (kg)</option>';
                        unitSelect.value = 'oz'; // Auto-select ounces for imperial
                        this.setActiveUnitButton('oz'); // Sync unit buttons
                    }
                    
                    // Update energy units for all food sources to kcal/cup for imperial
                    this.foodSources.forEach(fs => {
                        if (fs.energyUnit === 'kcal100g') {
                            fs.energyUnit = 'kcalcup';
                            const energyUnitSelect = document.getElementById(`energy-unit-${fs.id}`);
                            if (energyUnitSelect) {
                                energyUnitSelect.value = 'kcalcup';
                            }
                        }
                    });
                } else {
                    if (weightLabel) weightLabel.textContent = "Dog's Weight (kg):";
                    if (weightInput) {
                        weightInput.placeholder = "Enter weight in kg";
                        weightInput.min = "0.1";
                        weightInput.step = "0.1";
                    }
                    if (unitSelect) {
                        unitSelect.innerHTML = '<option value="g">grams (g)</option>' +
                            '<option value="kg">kilograms (kg)</option>' +
                            '<option value="oz">ounces (oz)</option>' +
                            '<option value="lb">pounds (lb)</option>';
                        unitSelect.value = 'g'; // Auto-select grams for metric
                        this.setActiveUnitButton('g'); // Sync unit buttons
                    }
                    
                    // Update energy units for all food sources to kcal/100g for metric
                    this.foodSources.forEach(fs => {
                        if (fs.energyUnit === 'kcalcup') {
                            fs.energyUnit = 'kcal100g';
                            const energyUnitSelect = document.getElementById(`energy-unit-${fs.id}`);
                            if (energyUnitSelect) {
                                energyUnitSelect.value = 'kcal100g';
                            }
                        }
                    });
                }
            }

            convertExistingValues() {
                const weightInput = this.container.querySelector('#weight');

                if (weightInput && weightInput.value) {
                    const currentWeight = parseFloat(weightInput.value);
                    if (!isNaN(currentWeight)) {
                        if (this.isImperial) {
                            weightInput.value = this.formatNumber(currentWeight * 2.20462, 1);
                        } else {
                            weightInput.value = this.formatNumber(currentWeight / 2.20462, 1);
                        }
                    }
                }
            }

            getWeightInKg() {
                const weightInput = this.container.querySelector('#weight');
                if (!weightInput || !weightInput.value) return null;
                
                const weight = parseFloat(weightInput.value);
                if (isNaN(weight)) return null;
                
                return this.isImperial ? weight / 2.20462 : weight;
            }


            calculateRER(weightKg) {
                return 70 * Math.pow(weightKg, 0.75);
            }

            calculateMER(rer, factor) {
                return rer * factor;
            }

            validateInput(value, min = 0, isInteger = false) {
                const num = parseFloat(value);
                if (isNaN(num) || num < min) return false;
                if (isInteger && !Number.isInteger(num)) return false;
                return true;
            }

            showError(elementId, show = true) {
                const errorElement = document.getElementById(elementId);
                if (errorElement) {
                    if (show) {
                        errorElement.classList.remove('dog-calculator-hidden');
                    } else {
                        errorElement.classList.add('dog-calculator-hidden');
                    }
                }
            }

            convertUnits(grams, unit) {
                switch (unit) {
                    case 'kg':
                        return grams / 1000;
                    case 'oz':
                        return grams / 28.3495;
                    case 'lb':
                        return grams / 453.592;
                    default:
                        return grams;
                }
            }

            formatNumber(num, decimals = 0) {
                if (decimals === 0) {
                    return Math.round(num).toString();
                }
                return num.toFixed(decimals).replace(/\.?0+$/, '');
            }

            validateWeight() {
                const weightKg = this.getWeightInKg();
                if (weightKg !== null && weightKg < 0.1) {
                    this.showError('weightError', true);
                } else {
                    this.showError('weightError', false);
                }
            }


            validateDays() {
                const days = this.container.querySelector('#days')?.value;
                if (days && !this.validateInput(days, 1, true)) {
                    this.showError('daysError', true);
                } else {
                    this.showError('daysError', false);
                }
            }

            updateDayLabel() {
                const days = this.container.querySelector('#days')?.value;
                const dayLabel = this.container.querySelector('#dayLabel');
                if (dayLabel && days) {
                    const numDays = parseInt(days);
                    dayLabel.textContent = numDays === 1 ? 'day' : 'days';
                }
            }

            setActiveUnitButton(unit) {
                const unitButtons = this.container.querySelectorAll('.dog-calculator-unit-btn');
                unitButtons.forEach(button => {
                    button.classList.remove('active');
                    if (button.dataset.unit === unit) {
                        button.classList.add('active');
                    }
                });
            }

            updateCalorieCalculations() {
                const dogTypeSelect = this.container.querySelector('#dogType');
                const calorieResults = this.container.querySelector('#calorieResults');
                const rerValue = this.container.querySelector('#rerValue');
                const merValue = this.container.querySelector('#merValue');

                if (!dogTypeSelect || !calorieResults || !rerValue || !merValue) {
                    return;
                }

                const weightKg = this.getWeightInKg();
                const dogTypeFactor = dogTypeSelect.value;
                
                this.showError('weightError', false);
                
                if (!weightKg || weightKg < 0.1) {
                    const weightInput = this.container.querySelector('#weight');
                    if (weightInput && weightInput.value) this.showError('weightError', true);
                    calorieResults.style.display = 'none';
                    return;
                }

                if (!dogTypeFactor) {
                    calorieResults.style.display = 'none';
                    return;
                }

                const factor = parseFloat(dogTypeFactor);
                
                const rer = this.calculateRER(weightKg);
                const mer = this.calculateMER(rer, factor);
                
                this.currentMER = mer;
                
                rerValue.textContent = this.formatNumber(rer, 0) + ' cal/day';
                merValue.textContent = this.formatNumber(mer, 0) + ' cal/day';
                calorieResults.style.display = 'block';
                
                this.updateFoodCalculations();
                this.sendHeightToParent();
            }

            updateFoodCalculations() {
                if (this.currentMER === 0) return;
                
                const daysInput = this.container.querySelector('#days');
                const unitSelect = this.container.querySelector('#unit');
                const dailyFoodResults = this.container.querySelector('#dailyFoodResults');
                const dailyFoodValue = this.container.querySelector('#dailyFoodValue');
                const foodAmountsSection = this.container.querySelector('#foodAmountsSection');
                const foodAmountsList = this.container.querySelector('#foodAmountsList');
                const totalAmountDisplay = this.container.querySelector('#totalAmountDisplay');
                const foodBreakdownResults = this.container.querySelector('#foodBreakdownResults');
                const foodBreakdownList = this.container.querySelector('#foodBreakdownList');

                if (!daysInput || !unitSelect || !dailyFoodResults || !dailyFoodValue || !foodAmountsSection) {
                    return;
                }

                const days = daysInput.value;
                const unit = unitSelect.value;
                const unitLabel = unit === 'g' ? 'g' : unit === 'kg' ? 'kg' : unit === 'oz' ? 'oz' : 'lb';
                const decimals = unit === 'g' ? 0 : unit === 'kg' ? 2 : 1;
                
                // Clear all food source errors first
                this.foodSources.forEach(fs => {
                    this.showError(`energy-error-${fs.id}`, false);
                });
                this.showError('daysError', false);

                // Validate days input
                if (!days || !this.validateInput(days, 1, true)) {
                    if (days) this.showError('daysError', true);
                    foodAmountsSection.style.display = 'none';
                    dailyFoodResults.style.display = 'none';
                    if (foodBreakdownResults) foodBreakdownResults.style.display = 'none';
                    
                    // Hide unit buttons when validation fails
                    const unitButtons = this.container.querySelector('#unitButtons');
                    if (unitButtons) unitButtons.style.display = 'none';
                    return;
                }

                const numDays = parseInt(days);
                
                // Calculate per-food breakdown
                const foodBreakdowns = [];
                let totalDailyGrams = 0;
                let hasValidFoods = false;

                this.foodSources.forEach(fs => {
                    const energyPer100g = this.getFoodSourceEnergyPer100g(fs);
                    
                    if (energyPer100g && energyPer100g > 0.1 && fs.percentage > 0) {
                        const dailyCaloriesForThisFood = (this.currentMER * fs.percentage) / 100;
                        const dailyGramsForThisFood = (dailyCaloriesForThisFood / energyPer100g) * 100;
                        
                        foodBreakdowns.push({
                            name: fs.name,
                            percentage: fs.percentage,
                            dailyGrams: dailyGramsForThisFood,
                            calories: dailyCaloriesForThisFood,
                            isLocked: fs.isLocked,
                            hasEnergyContent: true
                        });
                        
                        totalDailyGrams += dailyGramsForThisFood;
                        hasValidFoods = true;
                    } else if (fs.percentage > 0) {
                        // Include food sources without energy content but show them as needing energy content
                        foodBreakdowns.push({
                            name: fs.name,
                            percentage: fs.percentage,
                            dailyGrams: 0,
                            calories: 0,
                            isLocked: fs.isLocked,
                            hasEnergyContent: false
                        });
                    }
                });

                if (!hasValidFoods) {
                    // Show errors for invalid food sources
                    this.foodSources.forEach(fs => {
                        const energyInput = document.getElementById(`energy-${fs.id}`);
                        if (energyInput && energyInput.value && (!this.getFoodSourceEnergyPer100g(fs) || this.getFoodSourceEnergyPer100g(fs) <= 0.1)) {
                            this.showError(`energy-error-${fs.id}`, true);
                        }
                    });
                    
                    dailyFoodResults.style.display = 'none';
                    if (foodBreakdownResults) foodBreakdownResults.style.display = 'none';
                    
                    // Hide unit buttons when no valid foods
                    const unitButtons = this.container.querySelector('#unitButtons');
                    if (unitButtons) unitButtons.style.display = 'none';
                    
                    // If we have any food sources without energy content, still show the breakdown section
                    if (foodBreakdowns.length > 0) {
                        // Show food amounts section with warnings for missing energy content
                        const unitLabel = unit === 'g' ? 'g' : unit === 'kg' ? 'kg' : unit === 'oz' ? 'oz' : 'lb';
                        
                        const foodAmountsHTML = foodBreakdowns.map(breakdown => {
                            const lockIndicator = breakdown.isLocked ? '<span class="dog-calculator-lock-indicator">🔒</span>' : '';
                            
                            return `
                                <div class="dog-calculator-food-amount-item">
                                    <div class="dog-calculator-food-amount-label">
                                        <span>${breakdown.name}</span>
                                        <span class="dog-calculator-food-percentage">${breakdown.percentage}%</span>
                                        ${lockIndicator}
                                    </div>
                                    <div class="dog-calculator-food-amount-value dog-calculator-warning" title="Enter energy content to calculate amount">
                                        ⚠️
                                    </div>
                                </div>
                            `;
                        }).join('');
                        
                        if (foodAmountsList) {
                            foodAmountsList.innerHTML = foodAmountsHTML;
                        }
                        
                        if (totalAmountDisplay) {
                            totalAmountDisplay.textContent = "Enter energy content for all foods";
                        }
                        
                        foodAmountsSection.style.display = 'block';
                        this.sendHeightToParent();
                    } else {
                        foodAmountsSection.style.display = 'none';
                    }
                    return;
                }

                // Update daily food results (total) - will be updated with proper units later
                dailyFoodResults.style.display = 'block';
                
                // Show unit buttons when daily results are shown
                const unitButtons = this.container.querySelector('#unitButtons');
                if (unitButtons) unitButtons.style.display = 'flex';

                // Update per-food breakdown
                if (foodBreakdownList && foodBreakdowns.length > 1) {
                    const breakdownHTML = foodBreakdowns.map(breakdown => {
                        const valueContent = breakdown.hasEnergyContent 
                            ? `${this.formatNumber(this.convertUnits(breakdown.dailyGrams, unit), decimals)} ${unitLabel}/day`
                            : `<span class="dog-calculator-warning" title="Enter energy content to calculate amount">⚠️</span>`;
                        
                        return `
                            <div class="dog-calculator-food-result-item">
                                <span class="dog-calculator-food-result-label">${breakdown.name} (${breakdown.percentage}%${breakdown.isLocked ? ' - locked' : ''}):</span>
                                <span class="dog-calculator-food-result-value">${valueContent}</span>
                            </div>
                        `;
                    }).join('');
                    
                    foodBreakdownList.innerHTML = breakdownHTML;
                    if (foodBreakdownResults) foodBreakdownResults.style.display = 'block';
                } else {
                    if (foodBreakdownResults) foodBreakdownResults.style.display = 'none';
                }

                // Generate individual food amount breakdown
                
                // Update daily food value with correct units
                const convertedDailyTotal = this.convertUnits(totalDailyGrams, unit);
                dailyFoodValue.textContent = this.formatNumber(convertedDailyTotal, decimals) + ` ${unitLabel}/day`;
                
                // Build HTML for individual food amounts
                const foodAmountsHTML = foodBreakdowns.map(breakdown => {
                    const lockIndicator = breakdown.isLocked ? '<span class="dog-calculator-lock-indicator">🔒</span>' : '';
                    
                    if (!breakdown.hasEnergyContent) {
                        // Show warning for food sources without energy content
                        return `
                            <div class="dog-calculator-food-amount-item">
                                <div class="dog-calculator-food-amount-label">
                                    <span>${breakdown.name}</span>
                                    <span class="dog-calculator-food-percentage">${breakdown.percentage}%</span>
                                    ${lockIndicator}
                                </div>
                                <div class="dog-calculator-food-amount-value dog-calculator-warning" title="Enter energy content to calculate amount">
                                    ⚠️
                                </div>
                            </div>
                        `;
                    } else {
                        const totalGramsForDays = breakdown.dailyGrams * numDays;
                        const convertedAmount = this.convertUnits(totalGramsForDays, unit);
                        
                        return `
                            <div class="dog-calculator-food-amount-item">
                                <div class="dog-calculator-food-amount-label">
                                    <span>${breakdown.name}</span>
                                    <span class="dog-calculator-food-percentage">${breakdown.percentage}%</span>
                                    ${lockIndicator}
                                </div>
                                <div class="dog-calculator-food-amount-value">
                                    ${this.formatNumber(convertedAmount, decimals)} ${unitLabel}
                                </div>
                            </div>
                        `;
                    }
                }).join('');
                
                // Calculate and display total
                const totalFoodGrams = totalDailyGrams * numDays;
                const totalConverted = this.convertUnits(totalFoodGrams, unit);
                
                // Update the display
                if (foodAmountsList) {
                    foodAmountsList.innerHTML = foodAmountsHTML;
                }
                
                if (totalAmountDisplay) {
                    totalAmountDisplay.textContent = `${this.formatNumber(totalConverted, decimals)} ${unitLabel}`;
                }
                
                foodAmountsSection.style.display = 'block';
                
                this.sendHeightToParent();
            }

            getFoodSourceEnergyPer100g(foodSource) {
                if (!foodSource.energy || !foodSource.energyUnit) return null;
                
                const energy = parseFloat(foodSource.energy);
                if (isNaN(energy)) return null;
                
                const unit = foodSource.energyUnit;
                
                // Convert all units to kcal/100g for internal calculations
                switch (unit) {
                    case 'kcal100g':
                        return energy;
                    case 'kcalkg':
                        return energy / 10; // 1 kg = 10 × 100g
                    case 'kcalcup':
                        return energy / 1.2; // Assume 1 cup ≈ 120g for dry dog food
                    case 'kcalcan':
                        return energy / 4.5; // Assume 1 can ≈ 450g for wet dog food
                    default:
                        return energy;
                }
            }

            setupIframeResize() {
                // Send height to parent window for iframe auto-resize
                this.sendHeightToParent();
                
                // Monitor for content changes that might affect height
                const observer = new MutationObserver(() => {
                    setTimeout(() => this.sendHeightToParent(), 100);
                });
                
                observer.observe(document.body, {
                    childList: true,
                    subtree: true,
                    attributes: true
                });
                
                // Send height on window resize
                window.addEventListener('resize', () => this.sendHeightToParent());
            }

            sendHeightToParent() {
                const height = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
                if (window.parent && window.parent !== window) {
                    window.parent.postMessage({
                        type: 'dogCalculatorResize',
                        height: height
                    }, '*');
                }
            }

            // Modal functionality
            showShareModal() {
                const modal = this.container.querySelector('#shareModal');
                const shareUrl = this.container.querySelector('#shareUrl');
                if (modal && shareUrl) {
                    shareUrl.value = window.location.href;
                    modal.style.display = 'block';
                }
            }

            hideShareModal() {
                const modal = this.container.querySelector('#shareModal');
                if (modal) modal.style.display = 'none';
            }

            showEmbedModal() {
                const modal = this.container.querySelector('#embedModal');
                const widgetCode = this.container.querySelector('#widgetCode');
                const iframeCode = this.container.querySelector('#iframeCode');
                
                if (modal && widgetCode && iframeCode) {
                    // Build embed URL
                    const baseUrl = window.location.protocol + '//embed.' + window.location.hostname;
                    
                    // Create widget code using createElement to avoid quote issues
                    const scriptTag = document.createElement('script');
                    scriptTag.src = baseUrl + '/dog-calorie-calculator/dog-food-calculator-widget.js';
                    const divTag = document.createElement('div');
                    divTag.id = 'dog-calorie-calculator';
                    
                    const widgetHtml = scriptTag.outerHTML + '\n' + divTag.outerHTML;
                    widgetCode.textContent = widgetHtml;
                    
                    // Create iframe code using createElement
                    const iframe = document.createElement('iframe');
                    iframe.src = baseUrl + '/dog-calorie-calculator/iframe.html';
                    iframe.width = '100%';
                    iframe.height = '600';
                    iframe.frameBorder = '0';
                    iframe.title = 'Dog Calorie Calculator';
                    
                    iframeCode.textContent = iframe.outerHTML;
                    modal.style.display = 'block';
                }
            }

            hideEmbedModal() {
                const modal = this.container.querySelector('#embedModal');
                if (modal) modal.style.display = 'none';
            }

            shareToFacebook() {
                const url = encodeURIComponent(window.location.href);
                window.open('https://www.facebook.com/sharer/sharer.php?u=' + url, '_blank', 'width=600,height=400');
            }

            shareToTwitter() {
                const url = encodeURIComponent(window.location.href);
                const text = encodeURIComponent('Check out this useful dog calorie calculator!');
                window.open('https://twitter.com/intent/tweet?url=' + url + '&text=' + text, '_blank', 'width=600,height=400');
            }

            shareToLinkedIn() {
                const url = encodeURIComponent(window.location.href);
                window.open('https://www.linkedin.com/sharing/share-offsite/?url=' + url, '_blank', 'width=600,height=400');
            }

            shareViaEmail() {
                const subject = encodeURIComponent('Dog Calorie Calculator');
                const body = encodeURIComponent('Check out this useful dog calorie calculator: ' + window.location.href);
                window.location.href = 'mailto:?subject=' + subject + '&body=' + body;
            }

            async copyShareLink() {
                const shareUrl = this.container.querySelector('#shareUrl');
                const copyBtn = this.container.querySelector('#shareCopy');
                
                if (shareUrl && copyBtn) {
                    try {
                        await navigator.clipboard.writeText(shareUrl.value);
                        const originalText = copyBtn.textContent;
                        copyBtn.textContent = 'Copied!';
                        copyBtn.classList.add('copied');
                        
                        setTimeout(() => {
                            copyBtn.textContent = originalText;
                            copyBtn.classList.remove('copied');
                        }, 2000);
                    } catch (err) {
                        // Fallback for older browsers
                        shareUrl.select();
                        document.execCommand('copy');
                    }
                }
            }

            async copyEmbedCode(type) {
                const codeElement = document.getElementById(type === 'widget' ? 'widgetCode' : 'iframeCode');
                const copyBtn = document.getElementById(type === 'widget' ? 'copyWidget' : 'copyIframe');
                
                if (codeElement && copyBtn) {
                    try {
                        await navigator.clipboard.writeText(codeElement.textContent);
                        const originalText = copyBtn.textContent;
                        copyBtn.textContent = 'Copied!';
                        copyBtn.classList.add('copied');
                        
                        setTimeout(() => {
                            copyBtn.textContent = originalText;
                            copyBtn.classList.remove('copied');
                        }, 2000);
                    } catch (err) {
                        // Fallback for older browsers
                        console.log('Copy fallback needed');
                    }
                }
            }
        }

        // Initialize calculator when DOM is ready
        
    
    // Auto-initialize widgets on page load
    function initializeWidget() {
        injectStyles();
        
        const containers = document.querySelectorAll('#dog-calorie-calculator, .dog-calorie-calculator');
        containers.forEach(container => {
            if (container.dataset.initialized) return;
            
            const options = {
                theme: container.dataset.theme || 'system',
                scale: parseFloat(container.dataset.scale) || 1.0
            };
            
            new DogCalorieCalculatorWidget(container, options);
            container.dataset.initialized = 'true';
        });
    }
    
    // Initialize when DOM is ready
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', initializeWidget);
    } else {
        initializeWidget();
    }
    
    // Export for manual initialization
    window.DogCalorieCalculatorWidget = DogCalorieCalculatorWidget;
    
})();