:root {
            --primary: #FFD200;
            --primary-hover: #e6bd00;
            --secondary: #2D303A;
            --secondary-light: #3d414d;
            --text-light: #ffffff;
            --text-dark: #2D303A;
            --text-gray: #6b7280;
            --bg-light: #f3f4f6;
            --white: #ffffff;
            --border: #e5e7eb;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', sans-serif;
        }

        html {
            font-size: 16px;
        }

        body {
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.5;
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1.5rem 1rem;
        }

        /* Header */
        header {
            background-color: var(--secondary);
            color: var(--text-light);
            padding: 1rem 0;
            margin-bottom: 1.5rem;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 1.25rem;
            font-weight: 700;
            white-space: nowrap;
        }

        .logo i {
            color: var(--primary);
        }

        /* Main Grid */
        .calculator-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin-bottom: 1.5rem;
        }

        /* Card Styles */
        .card {
            background: var(--white);
            border-radius: 1rem;
            padding: 1.5rem;
            box-shadow: var(--shadow);
            height: 100%;
        }

        .card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.25rem;
            border-bottom: 1px solid var(--border);
            padding-bottom: 0.75rem;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .card-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* Inputs */
        .input-group {
            margin-bottom: 1.5rem;
        }

        .input-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--text-dark);
        }

        .input-wrapper {
            position: relative;
            display: flex;
            align-items: center;
        }

        .input-icon {
            position: absolute;
            left: 1rem;
            color: var(--text-gray);
        }

        .form-input {
            width: 100%;
            padding: 0.75rem 1rem 0.75rem 2.5rem;
            border: 1px solid var(--border);
            border-radius: 0.5rem;
            font-size: 1rem;
            transition: border-color 0.2s;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255, 210, 0, 0.1);
        }

        .currency-select {
            padding: 0.5rem 2rem 0.5rem 1rem;
            border: 1px solid var(--border);
            border-radius: 0.5rem;
            background-color: var(--bg-light);
            font-weight: 600;
            cursor: pointer;
            margin-bottom: 1rem;
        }

        /* Range Slider */
        .range-slider {
            width: 100%;
            margin-top: 0.5rem;
            height: 6px;
            background: var(--border);
            border-radius: 3px;
            outline: none;
            -webkit-appearance: none;
        }

        .range-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            background: var(--primary);
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid var(--white);
            box-shadow: 0 1px 3px rgba(0,0,0,0.3);
            transition: transform 0.1s;
        }

        .range-slider::-webkit-slider-thumb:hover {
            transform: scale(1.1);
        }

        /* Results Section */
        .result-box {
            background-color: var(--bg-light);
            border-radius: 0.75rem;
            padding: 1.5rem;
            text-align: center;
            margin-bottom: 2rem;
            border-left: 5px solid var(--primary);
        }

        .result-label {
            font-size: 0.875rem;
            color: var(--text-gray);
            margin-bottom: 0.5rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .result-value {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--secondary);
            margin-bottom: 0.25rem;
        }

        .summary-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .summary-item {
            text-align: center;
            padding: 1rem;
            background-color: rgba(255, 210, 0, 0.1);
            border-radius: 0.5rem;
        }

        .summary-item.secondary {
            background-color: rgba(45, 48, 58, 0.05);
        }

        .summary-value {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--secondary);
        }

        /* Chart */
        .chart-container {
            position: relative;
            height: 300px;
            width: 100%;
            display: flex;
            justify-content: center;
        }

        /* Buttons */
        .btn-group {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            border: none;
            flex: 1;
        }

        .btn-primary {
            background-color: var(--primary);
            color: var(--text-dark);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
        }

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

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

        /* Table */
        .table-container {
            overflow-x: auto;
            margin-top: 2rem;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        th {
            background-color: var(--secondary);
            color: var(--text-light);
            padding: 1rem;
            font-weight: 500;
        }

        td {
            padding: 1rem;
            border-bottom: 1px solid var(--border);
        }

        tr:nth-child(even) {
            background-color: var(--bg-light);
        }

        /* Tenure Selection */
        .tenure-toggle {
            display: flex;
            background: var(--bg-light);
            padding: 0.25rem;
            border-radius: 0.5rem;
            margin-bottom: 0.5rem;
            width: fit-content;
        }

        .tenure-btn {
            padding: 0.25rem 0.75rem;
            border-radius: 0.25rem;
            border: none;
            background: transparent;
            cursor: pointer;
            font-size: 0.875rem;
            color: var(--text-gray);
        }

        .tenure-btn.active {
            background: var(--white);
            color: var(--secondary);
            box-shadow: 0 1px 2px rgba(0,0,0,0.1);
            font-weight: 600;
        }

        /* ===== RESPONSIVE DESIGN ===== */
        /* Large Desktop (1025px+) */
        @media (min-width: 1025px) {
            .container {
                padding: 2rem 1rem;
            }
            .calculator-grid {
                gap: 2rem;
            }
            .card {
                padding: 2rem;
            }
            .result-value {
                font-size: 2.5rem;
            }
        }

        /* Medium Screen / Tablet Landscape (769px - 1024px) */
        @media (min-width: 769px) and (max-width: 1024px) {
            .container {
                padding: 1.75rem 1rem;
            }
            .calculator-grid {
                grid-template-columns: 1fr 1fr;
                gap: 1.75rem;
            }
            .card {
                padding: 1.75rem;
            }
            .result-value {
                font-size: 2.25rem;
            }
            .summary-grid {
                gap: 1rem;
                margin-bottom: 1.5rem;
            }
            .btn-group {
                gap: 0.75rem;
            }
        }

        /* Tablet & Small Laptop (481px - 768px) */
        @media (min-width: 481px) and (max-width: 768px) {
            .container {
                padding: 1.25rem 0.75rem;
            }
            .calculator-grid {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
            .card {
                padding: 1.25rem;
            }
            .card-header {
                margin-bottom: 1rem;
                padding-bottom: 0.75rem;
            }
            .result-value {
                font-size: 2rem;
            }
            .summary-grid {
                grid-template-columns: 1fr 1fr;
                gap: 0.75rem;
                margin-bottom: 1.5rem;
            }
            .summary-value {
                font-size: 1.1rem;
            }
            .form-input {
                padding: 0.65rem 0.75rem 0.65rem 2.25rem;
                font-size: 16px;
            }
            .btn {
                padding: 0.65rem 1.25rem;
                font-size: 0.9rem;
            }
            .result-box {
                padding: 1.25rem;
            }
            th, td {
                padding: 0.75rem;
                font-size: 0.9rem;
            }
        }

        /* Mobile Phone (320px - 480px) */
        @media (max-width: 480px) {
            html {
                font-size: 15px;
            }
            
            .container {
                padding: 1rem 0.75rem;
            }

            header {
                padding: 0.75rem 0;
                margin-bottom: 1rem;
            }

            .header-content {
                padding: 0 0.75rem;
                gap: 0.5rem;
            }

            .logo {
                font-size: 1rem;
                gap: 0.5rem;
            }

            .currency-select {
                padding: 0.5rem 1.5rem 0.5rem 0.75rem;
                font-size: 0.9rem;
                margin-bottom: 0.75rem;
            }

            .calculator-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
                margin-bottom: 1rem;
            }

            .card {
                padding: 1rem;
                border-radius: 0.75rem;
            }

            .card-header {
                margin-bottom: 1rem;
                padding-bottom: 0.5rem;
                gap: 0.25rem;
            }

            .card-title {
                font-size: 1rem;
                gap: 0.4rem;
            }

            .input-group {
                margin-bottom: 1.25rem;
            }

            .input-label {
                font-size: 0.85rem;
                margin-bottom: 0.4rem;
            }

            .form-input {
                padding: 0.6rem 0.7rem 0.6rem 2.1rem;
                font-size: 16px;
                border-radius: 0.4rem;
            }

            .input-icon {
                left: 0.7rem;
                font-size: 0.85rem;
            }

            .currency-select {
                width: 100%;
            }

            .range-slider {
                margin-top: 0.4rem;
                height: 5px;
            }

            .range-slider::-webkit-slider-thumb {
                width: 18px;
                height: 18px;
            }

            .result-box {
                padding: 1rem;
                margin-bottom: 1.25rem;
                border-left-width: 4px;
            }

            .result-label {
                font-size: 0.75rem;
                margin-bottom: 0.35rem;
            }

            .result-value {
                font-size: 1.75rem;
                margin-bottom: 0.2rem;
            }

            .summary-grid {
                grid-template-columns: 1fr;
                gap: 0.75rem;
                margin-bottom: 1rem;
            }

            .summary-item {
                padding: 0.75rem;
                border-radius: 0.4rem;
            }

            .summary-value {
                font-size: 1rem;
            }

            .chart-container {
                height: 250px;
                margin: 0.5rem 0;
            }

            .btn-group {
                flex-direction: column;
                gap: 0.75rem;
                margin-top: 0.75rem;
            }

            .btn {
                padding: 0.6rem 1rem;
                font-size: 0.85rem;
                min-height: 44px;
            }

            .btn i {
                font-size: 0.85rem;
            }

            .table-container {
                margin-top: 1.25rem;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }

            table {
                font-size: 0.85rem;
                width: 100%;
            }

            th {
                padding: 0.65rem;
                font-size: 0.8rem;
            }

            td {
                padding: 0.65rem;
                border-bottom: 1px solid var(--border);
            }

            .tenure-toggle {
                margin-bottom: 0.35rem;
                padding: 0.2rem;
            }

            .tenure-btn {
                padding: 0.2rem 0.6rem;
                font-size: 0.8rem;
            }

            .card-title i {
                font-size: 0.95rem;
            }
        }

        /* Extra Small Phone (max-width: 320px) */
        @media (max-width: 320px) {
            .container {
                padding: 0.75rem 0.5rem;
            }

            .card {
                padding: 0.75rem;
                border-radius: 0.6rem;
            }

            .logo {
                font-size: 0.9rem;
            }

            .card-title {
                font-size: 0.9rem;
            }

            .btn {
                padding: 0.5rem 0.75rem;
                font-size: 0.8rem;
            }

            .result-value {
                font-size: 1.5rem;
            }

            .summary-value {
                font-size: 0.9rem;
            }

            .form-input {
                font-size: 15px;
            }
        }

        /* Touch-Friendly Interactions */
        @media (hover: none) and (pointer: coarse) {
            .btn {
                min-height: 44px;
            }

            .range-slider::-webkit-slider-thumb {
                width: 24px;
                height: 24px;
            }

            .form-input {
                font-size: 16px;
            }
        }

        /* PDF & Print Styles */
        @media print {
            body {
                background: white;
            }
            .no-print {
                display: none !important;
            }
            .range-slider {
                display: none !important;
            }
            .tenure-toggle {
                display: none !important;
            }
            .card {
                box-shadow: none;
                border: 1px solid #ddd;
                page-break-inside: avoid;
            }
            .calculator-grid {
                grid-template-columns: 1fr;
            }
            table {
                page-break-inside: avoid;
            }
        }

        .pdf-preview-content {
            display: none;
        }

        .pdf-preview-content.active {
            display: block;
        }