: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 */