/* ===== CSS Variables & Reset ===== */
        :root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #9b59b6;
            --success-color: #27ae60;
            --warning-color: #f39c12;
            --danger-color: #e74c3c;
            --light-color: #f8f9fa;
            --gray-light: #e9ecef;
            --gray-medium: #6c757d;
            --gray-dark: #343a40;
            --white: #ffffff;
            --shadow: 0 2px 10px rgba(0,0,0,0.08);
            --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
            --border-radius: 10px;
            --transition: all 0.3s ease;
            --container-padding: 20px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background-color: #f5f7fa;
            color: var(--gray-dark);
            line-height: 1.6;
        }

        /* ===== Typography ===== */
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }

        h1 { font-size: 1.75rem; }
        h2 { font-size: 1.5rem; }
        h3 { font-size: 1.25rem; }
        h4 { font-size: 1.1rem; }

        p {
            margin-bottom: 1rem;
        }

        .text-muted {
            color: var(--gray-medium);
            font-size: 0.9rem;
        }

        /* ===== Accessibility ===== */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* Focus styles for accessibility */
        *:focus {
            outline: 3px solid var(--secondary-color);
            outline-offset: 2px;
        }

        /* ===== Layout Components ===== */
        .app-container {
	display: flex;
	flex-direction: column;
	gap: 24px;
	max-width: 1200px;
			     padding: var(--container-padding);
	margin-top: 0;
	margin-right: auto;
	margin-bottom: 0;
	margin-left: auto;
	padding-top: 0px;
        }
.app-cont{
	display: flex;
	flex-direction: column;
	max-width: 1200px;
			     padding: var(--container-padding);
	margin-top: 0;
	margin-right: auto;
	margin-bottom: 0;
	margin-left: auto;
	padding-top: 10px;
        }
        @media (min-width: 992px) {
            .app-container {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        .calculator-section {
            background: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 24px;
            margin-bottom: 20px;
        }

        .section-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 2px solid var(--gray-light);
        }

        .section-icon {
            background: var(--secondary-color);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
        }

        /* ===== Form Elements ===== */
        .form-group {
            margin-bottom: 20px;
            position: relative;
        }

        label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--gray-dark);
            font-size: 0.95rem;
        }

        select, input[type="number"], input[type="text"] {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid var(--gray-light);
            border-radius: 8px;
            font-size: 16px;
            transition: var(--transition);
            background-color: var(--white);
        }

        select:focus, input:focus {
            outline: none;
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }

        /* Mobile touch target optimization */
        @media (max-width: 767px) {
            select, input[type="number"], input[type="text"] {
                padding: 18px 16px;
                font-size: 18px; /* Larger text for mobile */
                min-height: 60px; /* Minimum touch target */
            }
            
            /* Remove number input spinners on mobile */
            input[type="number"] {
                -webkit-appearance: none;
                -moz-appearance: textfield;
            }
            
            input[type="number"]::-webkit-inner-spin-button,
            input[type="number"]::-webkit-outer-spin-button {
                -webkit-appearance: none;
                margin: 0;
            }
        }

        .input-with-unit {
            position: relative;
        }

        .input-unit {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray-medium);
            font-weight: 600;
        }

        /* Error messages */
        .error-message {
            color: var(--danger-color);
            font-size: 0.85rem;
            margin-top: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .error-icon {
            font-size: 0.9rem;
        }

        .has-error select,
        .has-error input {
            border-color: var(--danger-color);
        }

        /* ===== Radio & Checkbox Groups (Mobile Optimized) ===== */
        .radio-group, .checkbox-group {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .radio-item, .checkbox-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 16px; /* Increased padding for mobile */
            background: var(--light-color);
            border-radius: 8px;
            border: 2px solid transparent;
            transition: var(--transition);
            cursor: pointer;
            min-height: 60px; /* Minimum touch target for mobile */
        }

        /* Mobile-specific touch targets */
        @media (max-width: 767px) {
            .radio-item, .checkbox-item {
                padding: 20px 16px;
                min-height: 70px;
            }
            
            .radio-item input, .checkbox-item input {
                width: 24px;
                height: 24px;
                min-width: 24px;
                min-height: 24px;
            }
        }

        .radio-item:hover, .checkbox-item:hover {
            border-color: var(--secondary-color);
            background: rgba(52, 152, 219, 0.05);
        }

        .radio-item input, .checkbox-item input {
            width: 20px;
            height: 20px;
            cursor: pointer;
            flex-shrink: 0;
        }

        .radio-text, .checkbox-text {
            flex: 1;
        }

        .radio-title {
            font-weight: 600;
            display: block;
            margin-bottom: 2px;
        }

        .radio-desc {
            font-size: 0.85rem;
            color: var(--gray-medium);
        }

        /* ===== Button Styles ===== */
        .btn {
            padding: 14px 24px;
            border-radius: 8px;
            border: none;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            width: 100%;
            position: relative;
        }

        /* Mobile button optimization */
        @media (max-width: 767px) {
            .btn {
                padding: 18px 24px;
                min-height: 60px;
                font-size: 1.1rem;
            }
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--secondary-color) 0%, #2980b9 100%);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
        }

        .btn-secondary {
            background: var(--light-color);
            color: var(--gray-dark);
        }

        .btn-secondary:hover {
            background: #e9ecef;
        }

        .btn-success {
            background: var(--success-color);
            color: white;
        }

        .btn-success:hover {
            background: #219653;
            transform: translateY(-2px);
        }

        .btn-copy {
            background: #6c757d;
            color: white;
            padding: 8px 16px;
            font-size: 0.9rem;
        }

        .btn-copy:hover {
            background: #5a6268;
        }

        .btn-copy.copied {
            background: var(--success-color);
        }

        /* ===== Results Display ===== */
        .results-container {
            background: var(--white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 24px;
            display: block;
        }

        .results-placeholder {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 40px 20px;
            color: var(--gray-medium);
        }

        .placeholder-icon {
            font-size: 3rem;
            color: var(--gray-light);
            margin-bottom: 20px;
        }

        .placeholder-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--gray-medium);
            margin-bottom: 10px;
        }

        .placeholder-subtitle {
            color: var(--gray-medium);
            margin-bottom: 30px;
            max-width: 300px;
        }

        .actual-results {
            display: none;
        }

        .actual-results.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }

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

        .cost-summary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: var(--border-radius);
            padding: 24px;
            margin-bottom: 20px;
            position: relative;
        }

        .copy-results-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255, 255, 255, 0.2);
            border: 1px solid rgba(255, 255, 255, 0.3);
            color: white;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 0.9rem;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }

        .copy-results-btn:hover {
            background: rgba(255, 255, 255, 0.3);
        }

        .cost-range {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 8px;
            text-align: center;
        }

        .cost-label {
            text-align: center;
            opacity: 0.9;
            font-size: 0.9rem;
        }

        /* ===== Copy Results Section ===== */
        .copy-section {
            background: var(--light-color);
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            border: 2px dashed var(--gray-light);
        }

        .copy-textarea {
            width: 100%;
            min-height: 120px;
            padding: 16px;
            border: 2px solid var(--gray-light);
            border-radius: 8px;
            font-family: monospace;
            font-size: 0.9rem;
            line-height: 1.5;
            resize: vertical;
            margin-bottom: 12px;
            background: var(--white);
        }

        .copy-textarea:focus {
            outline: none;
            border-color: var(--secondary-color);
        }

        .copy-buttons {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        /* ===== Scenario Comparison ===== */
        .scenario-comparison {
            background: var(--light-color);
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            border: 2px solid var(--gray-light);
        }

        .scenario-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
            margin-top: 16px;
        }

        @media (min-width: 768px) {
            .scenario-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        .scenario-card {
            background: var(--white);
            border-radius: 8px;
            padding: 20px;
            border: 2px solid var(--gray-light);
            transition: var(--transition);
        }

        .scenario-card.current {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
        }

        .scenario-card.alternative {
            border-color: var(--accent-color);
        }

        .scenario-card h5 {
            color: var(--primary-color);
            margin-bottom: 12px;
            font-size: 1.1rem;
        }

        .scenario-cost {
            font-size: 2rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 8px;
        }

        .scenario-card.alternative .scenario-cost {
            color: var(--accent-color);
        }

        .scenario-savings {
            background: var(--success-color);
            color: white;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-block;
            margin-top: 8px;
        }

        /* ===== Tabs ===== */
        .tabs {
            display: flex;
            gap: 4px;
            margin-bottom: 24px;
            border-bottom: 2px solid var(--gray-light);
        }

        .tab {
            padding: 12px 20px;
            background: none;
            border: none;
            font-weight: 600;
            color: var(--gray-medium);
            cursor: pointer;
            position: relative;
            transition: var(--transition);
            min-height: 48px; /* Better touch target */
        }

        @media (max-width: 767px) {
            .tab {
                padding: 16px 20px;
                min-height: 56px;
                flex: 1;
                text-align: center;
            }
            
            .tabs {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }
        }

        .tab.active {
            color: var(--secondary-color);
        }

        .tab.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--secondary-color);
            border-radius: 2px;
        }

        /* ===== Comparison Chart ===== */
        .comparison-chart {
            background: var(--light-color);
            border-radius: var(--border-radius);
            padding: 20px;
            margin-top: 20px;
        }

        .chart-bar {
            display: flex;
            align-items: center;
            margin-bottom: 12px;
        }

        .chart-label {
            width: 120px;
            font-weight: 500;
            font-size: 0.9rem;
        }

        .chart-value {
            flex: 1;
            height: 24px;
            background: #e9ecef;
            border-radius: 4px;
            overflow: hidden;
            position: relative;
        }

        .chart-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--secondary-color) 0%, var(--accent-color) 100%);
            border-radius: 4px;
            min-width: 2px;
        }

        .chart-number {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--gray-dark);
        }

        /* ===== Info Boxes ===== */
        .info-box {
            background: #e8f4fc;
            border-left: 4px solid var(--secondary-color);
            border-radius: 6px;
            padding: 16px;
            margin: 20px 0;
            display: flex;
            gap: 12px;
        }

        .info-icon {
            color: var(--secondary-color);
            font-size: 1.2rem;
            min-width: 24px;
        }

        .warning-box {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            color: #856404;
        }

        .warning-icon {
            color: #856404;
        }

        /* ===== Stats Cards ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin: 20px 0;
        }

        .stat-card {
            background: var(--light-color);
            border-radius: 8px;
            padding: 20px;
            text-align: center;
            border: 1px solid var(--gray-light);
        }

        .stat-value {
            font-size: 2rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 4px;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--gray-medium);
        }

        /* ===== Toast Notification ===== */
        .toast {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--success-color);
            color: white;
            padding: 16px 24px;
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
            display: flex;
            align-items: center;
            gap: 12px;
            z-index: 1000;
            transform: translateY(100px);
            opacity: 0;
            transition: all 0.3s ease;
        }

        .toast.show {
            transform: translateY(0);
            opacity: 1;
        }

        .toast.error {
            background: var(--danger-color);
        }

        /* ===== Mobile Responsive ===== */
        @media (max-width: 767px) {
         
            .calculator-section {
                padding: 20px;
            }
            
            .cost-range {
                font-size: 2rem;
            }
            
            h1 {
                font-size: 1.5rem;
            }
            
            h2 {
                font-size: 1.3rem;
            }
            
            .stats-grid {
                grid-template-columns: 1fr;
            }
            
            .copy-buttons {
                flex-direction: column;
            }
            
            .copy-results-btn {
                position: relative;
                top: auto;
                right: auto;
                margin-top: 12px;
                width: 100%;
            }
            
            .toast {
                left: 20px;
                right: 20px;
                bottom: 80px;
            }
        }

        @media (min-width: 768px) and (max-width: 991px) {
            .app-container {
                grid-template-columns: 1fr;
            }
            
            .tabs {
                justify-content: center;
            }
        }

        /* ===== Utility Classes ===== */
        .d-none {
            display: none;
        }

        .mt-3 { margin-top: 1rem; }
        .mt-4 { margin-top: 1.5rem; }
        .mb-3 { margin-bottom: 1rem; }
        .mb-4 { margin-bottom: 1.5rem; }
        .text-center { text-align: center; }
        .text-right { text-align: right; }