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

/**
 * Dog Calorie Calculator Widget
 * Embeddable JavaScript widget for websites
 * 
 * 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 with proper namespacing
    const CSS_STYLES = `/* Sundog Dog Food Calorie Calculator Styles */

        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: #6f3f6d;
        }

        .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: #fdfcfe;
            border: 1px solid #e8e3ed;
            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: #6f3f6d;
            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: #635870;
            transition: color 0.2s ease;
        }

        .dog-calculator-unit-label.active {
            color: #6f3f6d;
            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: #e8e3ed;
            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: #6f3f6d;
            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 #e8e3ed;
            border-radius: 6px;
            font-size: 1rem;
            font-family: inherit;
            background-color: #ffffff;
            color: #6f3f6d;
            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: #ffffff;
            color: #6f3f6d;
        }

        .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: #ffffff;
            box-shadow: 0 0 0 3px rgba(241, 154, 95, 0.1);
        }

        .dog-calculator-form-group input[readonly] {
            background-color: #f8f5fa;
            cursor: not-allowed;
            color: #635870;
        }

        .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: #6f3f6d;
            font-size: 0.95rem;
        }

        .dog-calculator-result-value {
            font-weight: 600;
            color: #6f3f6d;
            font-size: 1.1rem;
            padding: 4px 12px;
            background: rgba(241, 154, 95, 0.15);
            border-radius: 4px;
        }

        .dog-calculator-collapsible {
            background: #ffffff;
            border: 1px solid #e8e3ed;
            border-top: none;
            margin-bottom: 0;
            overflow: hidden;
            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
        }

        .dog-calculator-collapsible-header {
            background: #f8f5fa;
            padding: 20px 24px;
            border-bottom: 1px solid #e8e3ed;
        }

        .dog-calculator-collapsible-header h3 {
            margin: 0;
            font-size: 1.25rem;
            color: #6f3f6d;
            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: #e87159;
            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: #f8f5fa;
            border-left: 1px solid #e8e3ed;
            border-right: 1px solid #e8e3ed;
            margin-top: -1px;
            box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
        }

        .dog-calculator-btn {
            padding: 8px 16px;
            border: 1px solid #e8e3ed;
            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: #6f3f6d;
        }

        .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: #7fa464;
            color: #7fa464;
        }

        .dog-calculator-footer {
            text-align: center;
            padding: 20px;
            background: #fdfcfe;
            border: 1px solid #e8e3ed;
            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: column;
                gap: 20px;
            }

            .dog-calculator-input-group .dog-calculator-form-group {
                margin-bottom: 20px;
            }

            .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 {
            color: #f5f3f7;
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-section,
        .dog-calculator-container.theme-dark .dog-calculator-collapsible {
            background: #24202d;
            border-color: #433c4f;
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-collapsible-header {
            background: #312b3b;
            border-color: #433c4f;
        }
            
        .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: #f5f3f7;
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-label {
            color: #b8b0c2;
        }

        .dog-calculator-container.theme-dark .dog-calculator-unit-label.active {
            color: #f5f3f7;
        }

        .dog-calculator-container.theme-dark .dog-calculator-slider {
            background-color: #433c4f;
        }
            
        .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: #312b3b;
            border-color: #433c4f;
            color: #f5f3f7;
            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: #312b3b;
            color: #f5f3f7;
        }
            
        .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: #312b3b;
            border-color: #f19a5f;
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-form-group input[readonly] {
            background-color: #433c4f;
            color: #b8b0c2;
        }
            
        .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: #f5f3f7;
            background: rgba(241, 154, 95, 0.2);
        }
            
        .dog-calculator-container.theme-dark .dog-calculator-footer {
            background: #24202d;
            border-color: #433c4f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-action-buttons {
            background: #312b3b;
            border-color: #433c4f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-btn {
            background: #433c4f;
            border-color: #433c4f;
            color: #f5f3f7;
        }

        .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: #7fa464;
            color: #7fa464;
        }

        /* System theme - follows user's OS preference */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system {
                color: #f5f3f7;
            }
            
            .dog-calculator-container.theme-system .dog-calculator-section,
            .dog-calculator-container.theme-system .dog-calculator-collapsible {
                background: #24202d;
                border-color: #433c4f;
            }
            
            .dog-calculator-container.theme-system .dog-calculator-collapsible-header {
                background: #312b3b;
                border-color: #433c4f;
            }
            
            .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: #f5f3f7;
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-label {
                color: #b8b0c2;
            }

            .dog-calculator-container.theme-system .dog-calculator-unit-label.active {
                color: #f5f3f7;
            }

            .dog-calculator-container.theme-system .dog-calculator-slider {
                background-color: #433c4f;
            }
            
            .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: #312b3b;
                border-color: #433c4f;
                color: #f5f3f7;
                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: #312b3b;
                color: #f5f3f7;
            }
            
            .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: #312b3b;
                border-color: #f19a5f;
            }
            
            .dog-calculator-container.theme-system .dog-calculator-form-group input[readonly] {
                background-color: #433c4f;
                color: #b8b0c2;
            }
            
            .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: #f5f3f7;
                background: rgba(241, 154, 95, 0.2);
            }
            
            .dog-calculator-container.theme-system .dog-calculator-footer {
                background: #24202d;
                border-color: #433c4f;
            }

            .dog-calculator-container.theme-system .dog-calculator-action-buttons {
                background: #312b3b;
                border-color: #433c4f;
            }

            .dog-calculator-container.theme-system .dog-calculator-btn {
                background: #433c4f;
                border-color: #433c4f;
                color: #f5f3f7;
            }

            .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: #7fa464;
                color: #7fa464;
            }
        }

        /* Modal Styles */
        .dog-calculator-modal {
            display: none;
            position: fixed;
            z-index: 10000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            animation: fadeIn 0.3s ease;
        }

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

        .dog-calculator-modal-content {
            position: relative;
            background-color: #ffffff;
            margin: 5% auto;
            padding: 30px;
            border: 1px solid #e8e3ed;
            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: #6f3f6d;
            cursor: pointer;
            transition: color 0.2s ease;
        }

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

        .dog-calculator-modal h3 {
            margin: 0 0 24px 0;
            color: #6f3f6d;
            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 #e8e3ed;
            border-radius: 6px;
            font-size: 0.9rem;
            font-family: monospace;
            background: #f8f5fa;
            color: #6f3f6d;
        }

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

        .dog-calculator-embed-option {
            border: 1px solid #e8e3ed;
            border-radius: 8px;
            padding: 20px;
            background: #fcfafd;
        }

        .dog-calculator-embed-option h4 {
            margin: 0 0 8px 0;
            color: #6f3f6d;
            font-size: 1.1rem;
        }

        .dog-calculator-embed-option p {
            margin: 0 0 16px 0;
            color: #635870;
            font-size: 0.9rem;
        }

        /* Default (light theme) code containers */
        .dog-calculator-code-container {
            position: relative;
            background: #ffffff;
            border: 1px solid #e8e3ed;
            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: #312b3b;
            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: #7fa464; }
        .dog-calculator-copy-btn.copied:hover { background: #7fa464; }

        /* Dark theme modal styles */
        .dog-calculator-container.theme-dark .dog-calculator-modal-content {
            background-color: #24202d;
            border-color: #433c4f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-modal h3 {
            color: #f5f3f7;
        }

        .dog-calculator-container.theme-dark .dog-calculator-modal-close {
            color: #f5f3f7;
        }

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

        .dog-calculator-container.theme-dark .dog-calculator-share-url input {
            background: #312b3b;
            border-color: #433c4f;
            color: #f5f3f7;
        }

        .dog-calculator-container.theme-dark .dog-calculator-embed-option {
            background: #312b3b;
            border-color: #433c4f;
        }

        .dog-calculator-container.theme-dark .dog-calculator-embed-option h4 {
            color: #f5f3f7;
        }

        .dog-calculator-container.theme-dark .dog-calculator-embed-option p {
            color: #b8b0c2;
        }

        /* 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: #f5f3f7;
        }

        /* System theme modal styles */
        @media (prefers-color-scheme: dark) {
            .dog-calculator-container.theme-system .dog-calculator-modal-content {
                background-color: #24202d;
                border-color: #433c4f;
            }

            .dog-calculator-container.theme-system .dog-calculator-modal h3 {
                color: #f5f3f7;
            }

            .dog-calculator-container.theme-system .dog-calculator-modal-close {
                color: #f5f3f7;
            }

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

            .dog-calculator-container.theme-system .dog-calculator-share-url input {
                background: #312b3b;
                border-color: #433c4f;
                color: #f5f3f7;
            }

            .dog-calculator-container.theme-system .dog-calculator-embed-option {
                background: #312b3b;
                border-color: #433c4f;
            }

            .dog-calculator-container.theme-system .dog-calculator-embed-option h4 {
                color: #f5f3f7;
            }

            .dog-calculator-container.theme-system .dog-calculator-embed-option p {
                color: #b8b0c2;
            }

            /* 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: #f5f3f7;
            }
        }`;
    
    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);
    }
    
    // Main widget class
    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.init();
        }
        
        init() {
            // Insert the transformed calculator HTML
            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">
                    <div class="dog-calculator-input-group">
                        <div class="dog-calculator-form-group">
                            <label for="foodEnergy" id="foodEnergyLabel">Food Energy Content:</label>
                            <input type="number" id="foodEnergy" min="1" step="1" placeholder="Enter energy content" aria-describedby="foodEnergyHelp">
                            <div id="foodEnergyError" class="dog-calculator-error dog-calculator-hidden">Please enter a valid energy content</div>
                        </div>
                        <div class="dog-calculator-form-group">
                            <label for="energyUnit">Unit:</label>
                            <select id="energyUnit" class="dog-calculator-unit-select" aria-describedby="energyUnitHelp">
                                <option value="kcal100g">kcal/100g</option>
                                <option value="kcalkg">kcal/kg</option>
                                <option value="kcalcup">kcal/cup</option>
                                <option value="kcalcan">kcal/can</option>
                            </select>
                        </div>
                    </div>

                    <div class="dog-calculator-results" id="dailyFoodResults" style="display: none;">
                        <div class="dog-calculator-result-item">
                            <span class="dog-calculator-result-label">Daily Food Amount:</span>
                            <span class="dog-calculator-result-value" id="dailyFoodValue">- g/day</span>
                        </div>
                    </div>

                    <div class="dog-calculator-form-group" style="margin-top: 20px;">
                        <label for="days">Number of Days:</label>
                        <input type="number" id="days" min="1" step="1" value="1" placeholder="Enter number of days" aria-describedby="daysHelp">
                        <div id="daysError" class="dog-calculator-error dog-calculator-hidden">Please enter a valid number of days (minimum 1)</div>
                    </div>

                    <div class="dog-calculator-input-group">
                        <div class="dog-calculator-form-group">
                            <label for="totalFoodDisplay">Total Food Amount:</label>
                            <input type="text" id="totalFoodDisplay" readonly>
                        </div>
                        <div class="dog-calculator-form-group">
                            <label for="unit">Unit:</label>
                            <select id="unit" class="dog-calculator-unit-select" 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>
                    </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>
    </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>`;
            
            // Apply widget-specific settings
            this.applyTheme();
            this.applyScale();
            
            // Initialize the calculator with the same functionality as iframe
            this.initCalculator();
        }
        
        initCalculator() {
            const container = this.container;
            
            // Helper functions to scope DOM queries to this widget
            const $ = (selector) => container.querySelector(selector);
            const $$ = (selector) => container.querySelectorAll(selector);
            
            // Create calculator instance with exact same logic as iframe
            const calc = {
                currentMER: 0,
                isImperial: false,
                theme: this.options.theme,
                scale: this.options.scale,
                
                // Exact same calculation methods from iframe
                calculateRER: (weightKg) => 70 * Math.pow(weightKg, 0.75),
                calculateMER: (rer, factor) => rer * factor,
                
                formatNumber: (num, decimals = 0) => {
                    if (decimals === 0) return Math.round(num).toString();
                    return num.toFixed(decimals).replace(/\.?0+$/, '');
                },
                
                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;
                },
                
                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;
                    }
                },
                
                getWeightInKg: () => {
                    const weightInput = $('#weight');
                    if (!weightInput || !weightInput.value) return null;
                    const weight = parseFloat(weightInput.value);
                    if (isNaN(weight)) return null;
                    return calc.isImperial ? weight / 2.20462 : weight;
                },
                
                getFoodEnergyPer100g: () => {
                    const foodEnergyInput = $('#foodEnergy');
                    const energyUnitSelect = $('#energyUnit');
                    if (!foodEnergyInput || !foodEnergyInput.value || !energyUnitSelect) return null;
                    
                    const energy = parseFloat(foodEnergyInput.value);
                    if (isNaN(energy)) return null;
                    
                    const unit = energyUnitSelect.value;
                    switch (unit) {
                        case 'kcal100g': return energy;
                        case 'kcalkg': return energy / 10;
                        case 'kcalcup': return energy / 1.2;
                        case 'kcalcan': return energy / 4.5;
                        default: return energy;
                    }
                },
                
                showError: (elementId, show = true) => {
                    const errorElement = $('#' + elementId);
                    if (errorElement) {
                        if (show) {
                            errorElement.classList.remove('dog-calculator-hidden');
                        } else {
                            errorElement.classList.add('dog-calculator-hidden');
                        }
                    }
                },
                
                updateCalorieCalculations: () => {
                    const dogTypeSelect = $('#dogType');
                    const calorieResults = $('#calorieResults');
                    const rerValue = $('#rerValue');
                    const merValue = $('#merValue');

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

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

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

                    const factor = parseFloat(dogTypeFactor);
                    const rer = calc.calculateRER(weightKg);
                    const mer = calc.calculateMER(rer, factor);
                    
                    calc.currentMER = mer;
                    
                    rerValue.textContent = calc.formatNumber(rer, 0) + ' cal/day';
                    merValue.textContent = calc.formatNumber(mer, 0) + ' cal/day';
                    calorieResults.style.display = 'block';
                    
                    calc.updateFoodCalculations();
                },
                
                updateFoodCalculations: () => {
                    if (calc.currentMER === 0) return;
                    
                    const daysInput = $('#days');
                    const unitSelect = $('#unit');
                    const dailyFoodResults = $('#dailyFoodResults');
                    const dailyFoodValue = $('#dailyFoodValue');
                    const totalFoodDisplay = $('#totalFoodDisplay');

                    if (!daysInput || !unitSelect || !dailyFoodResults || !dailyFoodValue || !totalFoodDisplay) return;

                    const energyPer100g = calc.getFoodEnergyPer100g();
                    const days = daysInput.value;
                    const unit = unitSelect.value;
                    
                    calc.showError('foodEnergyError', false);
                    calc.showError('daysError', false);
                    
                    if (!energyPer100g || energyPer100g < 0.1) {
                        const foodEnergyInput = $('#foodEnergy');
                        if (foodEnergyInput && foodEnergyInput.value) calc.showError('foodEnergyError', true);
                        dailyFoodResults.style.display = 'none';
                        totalFoodDisplay.value = '';
                        return;
                    }

                    if (!days || !calc.validateInput(days, 1, true)) {
                        if (days) calc.showError('daysError', true);
                        totalFoodDisplay.value = '';
                        return;
                    }

                    const numDays = parseInt(days);
                    const dailyFoodGrams = (calc.currentMER / energyPer100g) * 100;
                    const totalFoodGrams = dailyFoodGrams * numDays;
                    
                    dailyFoodValue.textContent = calc.formatNumber(dailyFoodGrams, 1) + ' g/day';
                    dailyFoodResults.style.display = 'block';
                    
                    const convertedAmount = calc.convertUnits(totalFoodGrams, unit);
                    const unitLabel = unit === 'g' ? 'g' : unit === 'kg' ? 'kg' : unit === 'oz' ? 'oz' : 'lb';
                    const decimals = unit === 'g' ? 0 : unit === 'kg' ? 2 : 1;
                    
                    totalFoodDisplay.value = calc.formatNumber(convertedAmount, decimals) + ' ' + unitLabel;
                },
                
                // Unit switching methods (missing from previous version!)
                toggleUnits: () => {
                    const toggle = $('#unitToggle');
                    calc.isImperial = toggle.checked;
                    
                    calc.updateUnitLabels();
                    calc.convertExistingValues();
                    calc.updateCalorieCalculations();
                },

                updateUnitLabels: () => {
                    const metricLabel = $('#metricLabel');
                    const imperialLabel = $('#imperialLabel');
                    const weightLabel = $('#weightLabel');
                    const weightInput = $('#weight');
                    const unitSelect = $('#unit');
                    const energyUnitSelect = $('#energyUnit');

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

                    if (calc.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>';
                        }
                        // Set energy unit to kcal/cup for imperial
                        if (energyUnitSelect && energyUnitSelect.value === 'kcal100g') {
                            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>';
                        }
                        // Set energy unit to kcal/100g for metric
                        if (energyUnitSelect && energyUnitSelect.value === 'kcalcup') {
                            energyUnitSelect.value = 'kcal100g';
                        }
                    }
                },

                convertExistingValues: () => {
                    const weightInput = $('#weight');

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

                bindEvents: () => {
                    const weightInput = $('#weight');
                    const dogTypeSelect = $('#dogType');
                    const foodEnergyInput = $('#foodEnergy');
                    const daysInput = $('#days');
                    const unitSelect = $('#unit');
                    const energyUnitSelect = $('#energyUnit');
                    const unitToggle = $('#unitToggle');

                    if (weightInput) {
                        weightInput.addEventListener('input', () => calc.updateCalorieCalculations());
                    }
                    if (dogTypeSelect) dogTypeSelect.addEventListener('change', () => calc.updateCalorieCalculations());
                    if (foodEnergyInput) {
                        foodEnergyInput.addEventListener('input', () => calc.updateFoodCalculations());
                    }
                    if (energyUnitSelect) energyUnitSelect.addEventListener('change', () => calc.updateFoodCalculations());
                    if (daysInput) {
                        daysInput.addEventListener('input', () => calc.updateFoodCalculations());
                    }
                    if (unitSelect) unitSelect.addEventListener('change', () => calc.updateFoodCalculations());
                    if (unitToggle) unitToggle.addEventListener('change', () => calc.toggleUnits());
                },
                
                init: () => {
                    calc.bindEvents();
                    calc.updateUnitLabels(); // Initialize unit labels
                    const calcContainer = $('#dogCalculator');
                    if (calcContainer) {
                        calcContainer.classList.add('loaded');
                    }
                }
            };
            
            calc.init();
            return calc;
        }
        
        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 >= 0.5 && scale <= 2.0) ? scale : null;
        }

        applyTheme() {
            if (this.options.theme === 'light' || this.options.theme === 'dark') {
                this.container.classList.add('theme-' + this.options.theme);
            }
        }

        applyScale() {
            const scale = Math.max(0.5, Math.min(2.0, this.options.scale));
            if (scale !== 1.0) {
                this.container.style.transform = `scale(${scale})`;
                this.container.style.transformOrigin = 'top left';
            }
        }
    }
    
    // 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;
    
})();