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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
            font-size: 1rem;
            font-weight: 400;
            line-height: 1.5;
            color: #212529;
        }

        /* Bootstrap 5 Container System */
        .container {
            width: 100%;
            padding-right: var(--bs-gutter-x, 0.75rem);
            padding-left: var(--bs-gutter-x, 0.75rem);
            margin-right: auto;
            margin-left: auto;
        }

        @media (min-width: 576px) {
            .container {
                max-width: 540px;
            }
        }

        @media (min-width: 768px) {
            .container {
                max-width: 720px;
            }
        }

        @media (min-width: 992px) {
            .container {
                max-width: 960px;
            }
        }

        @media (min-width: 1200px) {
            .container {
                max-width: 1140px;
            }
        }

        @media (min-width: 1400px) {
            .container {
                max-width: 1320px;
            }
        }

        /* Bootstrap 5 Grid System */
        .row {
            --bs-gutter-x: 1.5rem;
            --bs-gutter-y: 0;
            display: flex;
            flex-wrap: wrap;
            margin-top: calc(-1 * var(--bs-gutter-y));
            margin-right: calc(-0.5 * var(--bs-gutter-x));
            margin-left: calc(-0.5 * var(--bs-gutter-x));
        }

        .row > * {
            flex-shrink: 0;
            width: 100%;
            max-width: 100%;
            padding-right: calc(var(--bs-gutter-x) * 0.5);
            padding-left: calc(var(--bs-gutter-x) * 0.5);
            margin-top: var(--bs-gutter-y);
        }

        .col-12 {
            flex: 0 0 auto;
            width: 100%;
        }

        /* Bootstrap 5 Card Component */
        .card {
            --bs-card-spacer-y: 1rem;
            --bs-card-spacer-x: 1rem;
            --bs-card-title-spacer-y: 0.5rem;
            --bs-card-border-width: 1px;
            --bs-card-border-color: var(--bs-border-color-translucent);
            --bs-card-border-radius: 0.375rem;
            --bs-card-box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
            --bs-card-inner-border-radius: calc(0.375rem - 1px);
            --bs-card-cap-padding-y: 0.5rem;
            --bs-card-cap-padding-x: 1rem;
            --bs-card-cap-bg: rgba(0, 0, 0, 0.03);
            --bs-card-cap-color: inherit;
            --bs-card-height: auto;
            --bs-card-color: inherit;
            --bs-card-bg: #fff;
            --bs-card-img-overlay-padding: 1rem;
            --bs-card-group-margin: 0.75rem;
            position: relative;
            display: flex;
            flex-direction: column;
            min-width: 0;
            height: var(--bs-card-height);
            word-wrap: break-word;
            background-color: var(--bs-card-bg);
            background-clip: border-box;
            border: var(--bs-card-border-width) solid var(--bs-card-border-color);
            border-radius: var(--bs-card-border-radius);
        }

        .card-body {
            flex: 1 1 auto;
            padding: var(--bs-card-spacer-y) var(--bs-card-spacer-x);
            color: var(--bs-card-color);
        }

        /* Bootstrap 5 Shadows */
        .shadow-lg {
            box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.175) !important;
        }

        /* Bootstrap 5 Text Utilities */
        .text-center {
            text-align: center !important;
        }

        .text-start {
            text-align: left !important;
        }

        .text-end {
            text-align: right !important;
        }

        /* Bootstrap 5 Spacing System (improved) */
        .m-0 { margin: 0 !important; }
        .m-1 { margin: 0.25rem !important; }
        .m-2 { margin: 0.5rem !important; }
        .m-3 { margin: 1rem !important; }
        .m-4 { margin: 1.5rem !important; }
        .m-5 { margin: 3rem !important; }

        .mt-0 { margin-top: 0 !important; }
        .mt-1 { margin-top: 0.25rem !important; }
        .mt-2 { margin-top: 0.5rem !important; }
        .mt-3 { margin-top: 1rem !important; }
        .mt-4 { margin-top: 1.5rem !important; }
        .mt-5 { margin-top: 3rem !important; }

        .mb-0 { margin-bottom: 0 !important; }
        .mb-1 { margin-bottom: 0.25rem !important; }
        .mb-2 { margin-bottom: 0.5rem !important; }
        .mb-3 { margin-bottom: 1rem !important; }
        .mb-4 { margin-bottom: 1.5rem !important; }
        .mb-5 { margin-bottom: 3rem !important; }

        .my-0 { margin-top: 0 !important; margin-bottom: 0 !important; }
        .my-1 { margin-top: 0.25rem !important; margin-bottom: 0.25rem !important; }
        .my-2 { margin-top: 0.5rem !important; margin-bottom: 0.5rem !important; }
        .my-3 { margin-top: 1rem !important; margin-bottom: 1rem !important; }
        .my-4 { margin-top: 1.5rem !important; margin-bottom: 1.5rem !important; }
        .my-5 { margin-top: 3rem !important; margin-bottom: 3rem !important; }

        .p-0 { padding: 0 !important; }
        .p-1 { padding: 0.25rem !important; }
        .p-2 { padding: 0.5rem !important; }
        .p-3 { padding: 1rem !important; }
        .p-4 { padding: 1.5rem !important; }
        .p-5 { padding: 3rem !important; }

        .pt-0 { padding-top: 0 !important; }
        .pt-1 { padding-top: 0.25rem !important; }
        .pt-2 { padding-top: 0.5rem !important; }
        .pt-3 { padding-top: 1rem !important; }
        .pt-4 { padding-top: 1.5rem !important; }
        .pt-5 { padding-top: 3rem !important; }

        .pb-0 { padding-bottom: 0 !important; }
        .pb-1 { padding-bottom: 0.25rem !important; }
        .pb-2 { padding-bottom: 0.5rem !important; }
        .pb-3 { padding-bottom: 1rem !important; }
        .pb-4 { padding-bottom: 1.5rem !important; }
        .pb-5 { padding-bottom: 3rem !important; }

        /* Bootstrap 5 Border Utilities */
        .border {
            border: 1px solid #dee2e6 !important;
        }

        .border-0 {
            border: 0 !important;
        }

        .border-1 {
            border-width: 1px !important;
        }

        .border-2 {
            border-width: 2px !important;
        }

        .border-3 {
            border-width: 3px !important;
        }

        .border-dashed {
            border-style: dashed !important;
        }

        .rounded {
            border-radius: 0.375rem !important;
        }

        .rounded-0 {
            border-radius: 0 !important;
        }

        .rounded-1 {
            border-radius: 0.25rem !important;
        }

        .rounded-2 {
            border-radius: 0.375rem !important;
        }

        .rounded-3 {
            border-radius: 0.5rem !important;
        }

        .rounded-pill {
            border-radius: 50rem !important;
        }

        /* Bootstrap 5 Display Utilities */
        .d-none {
            display: none !important;
        }

        .d-inline {
            display: inline !important;
        }

        .d-inline-block {
            display: inline-block !important;
        }

        .d-block {
            display: block !important;
        }

        .d-grid {
            display: grid !important;
        }

        .d-flex {
            display: flex !important;
        }

        /* Bootstrap 5 Gap Utilities */
        .gap-0 { gap: 0 !important; }
        .gap-1 { gap: 0.25rem !important; }
        .gap-2 { gap: 0.5rem !important; }
        .gap-3 { gap: 1rem !important; }
        .gap-4 { gap: 1.5rem !important; }
        .gap-5 { gap: 3rem !important; }

        /* Bootstrap 5 Responsive Utilities */
        @media (min-width: 576px) {
            .d-sm-block { display: block !important; }
            .d-sm-flex { display: flex !important; }
            .d-sm-grid { display: grid !important; }
        }

        @media (min-width: 768px) {
            .d-md-block { display: block !important; }
            .d-md-flex { display: flex !important; }
            .d-md-grid { display: grid !important; }
            .me-md-2 { margin-right: 0.5rem !important; }
            .ms-md-2 { margin-left: 0.5rem !important; }
        }

        @media (min-width: 992px) {
            .d-lg-block { display: block !important; }
            .d-lg-flex { display: flex !important; }
            .d-lg-grid { display: grid !important; }
        }

        @media (min-width: 1200px) {
            .d-xl-block { display: block !important; }
            .d-xl-flex { display: flex !important; }
            .d-xl-grid { display: grid !important; }
        }

        @media (min-width: 1400px) {
            .d-xxl-block { display: block !important; }
            .d-xxl-flex { display: flex !important; }
            .d-xxl-grid { display: grid !important; }
        }

        /* Bootstrap 5 Button System */
        .btn {
            --bs-btn-padding-x: 0.75rem;
            --bs-btn-padding-y: 0.375rem;
            --bs-btn-font-family: inherit;
            --bs-btn-font-size: 1rem;
            --bs-btn-font-weight: 400;
            --bs-btn-line-height: 1.5;
            --bs-btn-color: #212529;
            --bs-btn-bg: transparent;
            --bs-btn-border-width: 1px;
            --bs-btn-border-color: transparent;
            --bs-btn-border-radius: 0.375rem;
            --bs-btn-hover-border-color: transparent;
            --bs-btn-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 1px rgba(0, 0, 0, 0.075);
            --bs-btn-disabled-opacity: 0.65;
            --bs-btn-focus-box-shadow: 0 0 0 0.25rem rgba(var(--bs-btn-focus-shadow-rgb), .5);
            display: inline-block;
            padding: var(--bs-btn-padding-y) var(--bs-btn-padding-x);
            font-family: var(--bs-btn-font-family);
            font-size: var(--bs-btn-font-size);
            font-weight: var(--bs-btn-font-weight);
            line-height: var(--bs-btn-line-height);
            color: var(--bs-btn-color);
            text-align: center;
            text-decoration: none;
            vertical-align: middle;
            cursor: pointer;
            user-select: none;
            border: var(--bs-btn-border-width) solid var(--bs-btn-border-color);
            border-radius: var(--bs-btn-border-radius);
            background-color: var(--bs-btn-bg);
            transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
        }

        .btn:hover {
            color: var(--bs-btn-hover-color);
            background-color: var(--bs-btn-hover-bg);
            border-color: var(--bs-btn-hover-border-color);
        }

        .btn-lg {
            --bs-btn-padding-y: 0.5rem;
            --bs-btn-padding-x: 1rem;
            --bs-btn-font-size: 1.25rem;
            --bs-btn-border-radius: 0.5rem;
        }

        /* Bootstrap 5 Button Variants */
        .btn-primary {
            --bs-btn-color: #fff;
            --bs-btn-bg: #0d6efd;
            --bs-btn-border-color: #0d6efd;
            --bs-btn-hover-color: #fff;
            --bs-btn-hover-bg: #0b5ed7;
            --bs-btn-hover-border-color: #0a58ca;
            --bs-btn-focus-shadow-rgb: 49, 132, 253;
            --bs-btn-active-color: #fff;
            --bs-btn-active-bg: #0a58ca;
            --bs-btn-active-border-color: #0a53be;
        }

        .btn-outline-primary {
            --bs-btn-color: #0d6efd;
            --bs-btn-border-color: #0d6efd;
            --bs-btn-hover-color: #fff;
            --bs-btn-hover-bg: #0d6efd;
            --bs-btn-hover-border-color: #0d6efd;
            --bs-btn-focus-shadow-rgb: 13, 110, 253;
            --bs-btn-active-color: #fff;
            --bs-btn-active-bg: #0d6efd;
            --bs-btn-active-border-color: #0d6efd;
        }

        /* Custom Bootstrap 5 Enhancements */
        /* Custom card styling with modern backdrop effects */
        .custom-card {
            background: rgba(255, 255, 255, 0.95) !important;
            border-radius: 20px !important;
            backdrop-filter: blur(10px);
            border: none !important;
        }

        .custom-title {
            color: #333;
            font-size: 2.5em;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* Enhanced button styling for better visual appeal */
        .btn-primary {
            background: linear-gradient(45deg, #667eea, #764ba2) !important;
            border: none !important;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6) !important;
            background: linear-gradient(45deg, #7c8cec, #8459a4) !important;
        }

        .btn-outline-primary {
            border-color: #667eea !important;
            color: #667eea !important;
        }

        .btn-outline-primary:hover {
            background: linear-gradient(45deg, #667eea, #764ba2) !important;
            border-color: #667eea !important;
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            color: #fff !important;
        }

        /* Upload area styling */
        .upload-area {
            background: #f8f9fa;
            cursor: pointer;
            transition: all 0.3s ease;
            border-color: #dee2e6 !important;
            min-height: 100px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .upload-area:hover {
            background: #e9ecef;
            border-color: #667eea !important;
        }

        .upload-area.dragover {
            border-color: #667eea !important;
            background: #e9ecef !important;
            transform: scale(1.02);
        }

        /* Status message styling with Bootstrap 5 alert patterns */
        .status {
            padding: 0.75rem 1rem;
            margin-bottom: 1rem;
            border: 1px solid transparent;
            border-radius: 0.375rem;
            font-weight: 500;
        }

        .status:not(:empty) {
            display: block;
        }

        .status:empty {
            display: none;
        }

        .status.error {
            color: #842029;
            background-color: #f8d7da;
            border-color: #f5c2c7;
        }

        .status.success {
            color: #0f5132;
            background-color: #d1e7dd;
            border-color: #badbcc;
        }

        .status.warning {
            color: #664d03;
            background-color: #fff3cd;
            border-color: #ffecb5;
        }

        /* JSON Preview styling with improved readability */
        #jsonPreview {
            background-color: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 0.375rem;
            padding: 1rem;
            font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
            font-size: 0.875rem;
            line-height: 1.5;
            white-space: pre-wrap;
            word-wrap: break-word;
            max-height: 400px;
            overflow-y: auto;
            color: #212529;
        }

        /* Enhanced typography for better readability */
        h1, h2 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 2.5em;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 700;
        }

        /* File input and form controls */
        .file-input input[type="file"] {
            width: 100%;
            padding: 15px;
            border: 2px dashed #ddd;
            border-radius: 10px;
            background: #f9f9f9;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .file-input input[type="file"]:hover {
            border-color: #667eea;
            background: #f0f8ff;
        }

        /* Additional utility classes for enhanced functionality */
        .extracted-item {
            background: white;
            padding: 10px;
            margin-bottom: 8px;
            border-radius: 6px;
            border-left: 4px solid #667eea;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .stats {
            display: flex;
            justify-content: space-around;
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
        }

        .stat-item {
            text-align: center;
        }

        .stat-number {
            font-size: 2em;
            font-weight: bold;
        }

        .stat-label {
            font-size: 0.9em;
            opacity: 0.9;
        }

        /* Improved responsive design */
        @media (max-width: 575.98px) {
            .custom-title {
                font-size: 2rem;
            }
            
            .btn-lg {
                font-size: 1.1rem;
                padding: 0.4rem 0.8rem;
            }
            
            .container {
                padding-left: 10px;
                padding-right: 10px;
            }
        }

        @media (max-width: 767.98px) {
            .d-grid .btn {
                margin-bottom: 0.5rem;
            }
        }

        /* Custom Bootstrap overrides and additions */
        .custom-card {
            background: rgba(255, 255, 255, 0.95) !important;
            border-radius: 20px !important;
            backdrop-filter: blur(10px);
            border: none !important;
        }

        .custom-title {
            color: #333;
            font-size: 2.5em;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .upload-area {
            background: #f8f9fa;
            cursor: pointer;
            transition: all 0.3s ease;
            border-color: #dee2e6 !important;
        }

        .upload-area:hover {
            background: #e9ecef;
            border-color: #667eea !important;
        }

        /* Custom button styling to enhance Bootstrap buttons */
        .btn-primary {
            background: linear-gradient(45deg, #667eea, #764ba2) !important;
            border: none !important;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6) !important;
            background: linear-gradient(45deg, #7c8cec, #8459a4) !important;
        }

        .btn-outline-primary {
            border-color: #667eea !important;
            color: #667eea !important;
        }

        .btn-outline-primary:hover {
            background: linear-gradient(45deg, #667eea, #764ba2) !important;
            border-color: #667eea !important;
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
        }

        h1, h2 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 2.5em;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .input-section {
            margin-bottom: 30px;
        }

        label {
            display: block;
            margin-bottom: 10px;
            font-weight: bold;
            color: #555;
        }

        textarea {
            width: 100%;
            height: 200px;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            font-size: 14px;
            resize: vertical;
            transition: border-color 0.3s ease;
        }

        textarea:focus {
            outline: none;
            border-color: #667eea;
        }

        .file-input {
            margin-bottom: 20px;
        }

        .file-input input[type="file"] {
            width: 100%;
            padding: 15px;
            border: 2px dashed #ddd;
            border-radius: 10px;
            background: #f9f9f9;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .file-input input[type="file"]:hover {
            border-color: #667eea;
            background: #f0f8ff;
        }

        .controls {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 30px;
        }

        .control-group {
            flex: 1;
            min-width: 200px;
        }

        select, input[type="text"] {
            width: 100%;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.3s ease;
        }

        select:focus, input[type="text"]:focus {
            outline: none;
            border-color: #667eea;
        }

        .button-group {
            display: flex;
            gap: 15px;
            margin-bottom: 30px;
        }

        /* Legacy button styles - keeping for backwards compatibility but adapting for Bootstrap */
        button:not(.btn) {
            padding: 15px 30px;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1px;
        }



        .results-section {
            margin-top: 30px;
        }

        .results-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

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

        .result-box {
            background: #f8f9fa;
            border: 1px solid #e9ecef;
            border-radius: 10px;
            padding: 20px;
            max-height: 400px;
            overflow-y: auto;
        }

        .result-box h3 {
            color: #495057;
            margin-bottom: 15px;
            font-size: 1.2em;
        }

        .extracted-item {
            background: white;
            padding: 10px;
            margin-bottom: 8px;
            border-radius: 6px;
            border-left: 4px solid #667eea;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .stats {
            display: flex;
            justify-content: space-around;
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
        }

        .stat-item {
            text-align: center;
        }

        .stat-number {
            font-size: 2em;
            font-weight: bold;
        }

        .stat-label {
            font-size: 0.9em;
            opacity: 0.9;
        }

        .encoding-info {
            background: #fff3cd;
            border: 1px solid #ffeaa7;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 20px;
        }

        .encoding-info h4 {
            color: #856404;
            margin-bottom: 10px;
        }

        .copy-btn {
            background: #28a745;
            color: white;
            border: none;
            padding: 8px 16px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 12px;
            margin-top: 10px;
        }

        .copy-btn:hover {
            background: #218838;
        }

        /* Download buttons styling */
        #downloadButtons {
            text-align: center;
            margin: 20px 0;
        }

        #downloadButtons button {
            margin: 0 10px;
        }

        /* Upload area specific styling */
        #uploadArea {
            min-height: 100px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        #uploadArea.dragover {
            border-color: #667eea !important;
            background: #e9ecef !important;
            transform: scale(1.02);
        }

        /* Status message styling */
        .status {
            padding: 0.75rem 1rem;
            margin-bottom: 1rem;
            border: 1px solid transparent;
            border-radius: 0.375rem;
            font-weight: 500;
        }

        .status:not(:empty) {
            display: block;
        }

        .status:empty {
            display: none;
        }

        .status.error {
            color: #721c24;
            background-color: #f8d7da;
            border-color: #f5c6cb;
        }

        .status.success {
            color: #155724;
            background-color: #d4edda;
            border-color: #c3e6cb;
        }

        .status.warning {
            color: #856404;
            background-color: #fff3cd;
            border-color: #ffeaa7;
        }

        /* JSON Preview styling */
        #jsonPreview {
            background-color: #f8f9fa;
            border: 1px solid #e9ecef;
            border-radius: 0.375rem;
            padding: 1rem;
            font-family: 'Courier New', Monaco, Consolas, 'Liberation Mono', monospace;
            font-size: 0.875rem;
            line-height: 1.4;
            white-space: pre-wrap;
            word-wrap: break-word;
            max-height: 400px;
            overflow-y: auto;
        }