/* Skip to content link for keyboard/screen reader users */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 0 0 var(--radius-md) 0;
    z-index: 9999;
    font-weight: 600;
    font-size: 14px;
}

.skip-to-content:focus {
    top: 0;
}

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

:root {
    --color-primary: #0366d6;
    --color-primary-hover: #0256b5;
    --color-success: #28a745;
    --color-danger: #dc3545;
    --color-warning: #ffc107;
    --color-bg: #f6f8fa;
    --color-surface: #ffffff;
    --color-surface-secondary: #fafbfc;
    --color-border: #e1e4e8;
    --color-text: #24292e;
    --color-text-muted: #586069;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --color-bg-secondary: #f7fafc;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: var(--spacing-lg);
}

.header-layout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    max-width: 100%;
}

.header-tagline-left {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    opacity: 0.95;
    white-space: nowrap;
}

.header-tagline-left .lock-icon {
    font-size: 18px;
}

.header-center {
    flex: 1 1 auto;
    text-align: center;
    min-width: 0;
}

.app-header h1 {
    font-size: 28px;
    font-weight: 700;
    margin: 0;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-header h1 svg {
    transition: transform 0.3s ease;
}

.app-header h1:hover svg {
    transform: scale(1.1) rotate(2deg);
}

.header-subtitle {
    font-size: 13px;
    opacity: 0.9;
    margin-top: 4px;
}

.header-tagline-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    opacity: 0.95;
    white-space: nowrap;
}

.header-tagline-right .shield-icon {
    font-size: 16px;
}

/* Security Banner Styles - Compact Layout */

/* Responsive: Stack header on small screens */
@media (max-width: 768px) {
    .header-layout {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .header-tagline-left,
    .header-tagline-right {
        font-size: 12px;
    }
    
    .app-header h1 {
        font-size: 24px;
    }
    
    .app-header h1 svg {
        width: 32px;
        height: 32px;
        margin-right: 8px;
    }
    
    .header-subtitle {
        font-size: 12px;
    }
}

/* Footer Styles */
.app-footer {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    border: 2px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 var(--spacing-sm) 0;
}

.footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-list li {
    font-size: 13px;
    color: var(--color-text-muted);
    padding: 4px 0;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 2px solid var(--color-border);
    padding-top: var(--spacing-md);
    text-align: center;
}

.footer-bottom p {
    margin: var(--spacing-xs) 0;
    font-size: 13px;
    color: var(--color-text-muted);
}

.footer-version {
    font-weight: 600;
    color: var(--color-primary);
}

.main-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-lg);
}

.tool-sidebar {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.tool-search {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 13px;
    margin-bottom: var(--spacing-md);
    outline: none;
    transition: border-color 0.2s;
}

.tool-search:focus {
    border-color: var(--color-primary);
}

/* Favorites Section */
.favorites-section {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.favorites-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm) !important;
}

.clear-favorites-btn {
    background: none;
    border: none;
    font-size: 14px;
    cursor: pointer;
    opacity: 0.5;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.clear-favorites-btn:hover {
    opacity: 1;
    background: rgba(220, 53, 69, 0.1);
}

#favoritesList {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.category-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--color-text-muted);
    padding: var(--spacing-sm) 0;
    letter-spacing: 0.5px;
    margin-top: var(--spacing-md);
}

.category-title:first-child {
    margin-top: 0;
}

.tool-button {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    text-align: left;
    font-size: 13px;
    color: var(--color-text);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    margin-bottom: 2px;
}

.tool-button-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.star-icon {
    font-size: 16px;
    cursor: pointer;
    opacity: 0.3;
    transition: all 0.2s;
    padding: 4px;
    flex-shrink: 0;
}

.star-icon:hover {
    opacity: 1;
    transform: scale(1.2);
}

.star-icon.favorited {
    opacity: 1;
    filter: drop-shadow(0 0 2px rgba(255, 193, 7, 0.8));
}

.tool-button:hover {
    background: var(--color-surface-secondary);
    transform: translateX(2px);
}

.tool-button.active {
    background: var(--color-primary);
    color: white;
    font-weight: 500;
}

.content-area {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
    min-height: 600px;
}

.tool-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.tool-header h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.tool-header p {
    color: var(--color-text-muted);
    font-size: 14px;
}

.drop-area {
    border: 3px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    background: var(--color-surface-secondary);
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: var(--spacing-lg);
}

.drop-area:hover,
.drop-area.dragover {
    border-color: var(--color-primary);
    background: #f0f7ff;
    transform: scale(1.01);
}

.drop-area-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.drop-area-text {
    font-size: 16px;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.drop-area-hint {
    font-size: 13px;
    color: var(--color-text-muted);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color 0.2s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.1);
}

/* ACCESSIBILITY: Comprehensive focus styles */
.btn:focus,
.tool-button:focus,
.drop-area:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:focus:not(:focus-visible),
.tool-button:focus:not(:focus-visible),
.drop-area:focus:not(:focus-visible) {
    outline: none;
}

.star-icon:focus {
    outline: 2px solid var(--color-warning);
    outline-offset: 2px;
    border-radius: 50%;
}

.star-icon:focus:not(:focus-visible) {
    outline: none;
}

/* High contrast focus for critical actions */
.btn-primary:focus {
    outline-color: var(--color-success);
    outline-width: 4px;
}

.btn-danger:focus {
    outline-color: var(--color-danger);
    outline-width: 4px;
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.range-group {
    margin-bottom: var(--spacing-md);
}

.range-label {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: var(--spacing-sm);
}

.range-value {
    font-weight: 600;
    color: var(--color-primary);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(3, 102, 214, 0.3);
}

.btn-secondary {
    background: var(--color-surface-secondary);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg);
    border-color: var(--color-text-muted);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.file-list {
    margin-top: var(--spacing-lg);
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--color-surface-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: all 0.2s;
}

.file-item:hover {
    background: #f0f0f0;
    transform: translateX(4px);
}

.file-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.file-icon {
    font-size: 24px;
}

.file-details h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 2px;
}

.file-details p {
    font-size: 12px;
    color: var(--color-text-muted);
}

.file-remove {
    color: var(--color-danger);
    cursor: pointer;
    font-size: 20px;
    padding: var(--spacing-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

.file-remove:hover {
    background: rgba(220, 53, 69, 0.1);
}

.progress-container {
    display: none;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--color-surface-secondary);
    border-radius: var(--radius-lg);
}

.progress-container.active {
    display: block;
}

.progress-text {
    font-size: 14px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    font-weight: 500;
}

.progress-bar-container {
    height: 10px;
    background: var(--color-border);
    border-radius: 5px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    transition: width 0.3s;
    width: 0%;
}

.status-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    font-size: 13px;
    display: none;
}

.status-message.active {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.status-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.status-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.status-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffc107;
}

.hidden {
    display: none !important;
}

/* PDF Preview Styles - NEW FEATURE #1 */
.pdf-preview-container {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.pdf-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.pdf-preview-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
}

.pdf-preview-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Thumbnail Sidebar - NEW v7.8 */
.pdf-preview-body {
    display: flex;
    gap: var(--spacing-md);
    position: relative;
}

.thumbnail-sidebar {
    width: 0;
    overflow: hidden;
    transition: width 0.3s ease, opacity 0.3s ease;
    opacity: 0;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    flex-shrink: 0;
}

.thumbnail-sidebar.visible {
    width: 180px;
    opacity: 1;
}

.thumbnail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
    background: var(--color-surface-secondary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.thumbnail-header span {
    font-weight: 600;
    font-size: 13px;
    color: var(--color-text);
}

.btn-close-thumbnails {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.btn-close-thumbnails:hover {
    background: var(--color-danger);
    color: white;
}

.thumbnail-container {
    padding: var(--spacing-sm);
    overflow-y: auto;
    max-height: 600px;
}

.thumbnail-item {
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    border: 3px solid transparent;
    border-radius: var(--radius-md);
    padding: 4px;
    transition: all 0.2s;
    background: white;
    position: relative;
}

.thumbnail-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.thumbnail-item.selected {
    border-color: var(--color-success);
    background: rgba(40, 167, 69, 0.1);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

/* ENHANCEMENT v7.14: Keyboard navigation styles */
.thumbnail-item:focus {
    outline: 3px solid #2196F3;
    outline-offset: 2px;
    border-color: #2196F3;
}

.thumbnail-item:focus:not(:focus-visible) {
    outline: none;
}

.thumbnail-item canvas {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

.thumbnail-label {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 600;
}

.thumbnail-item.selected .thumbnail-label {
    background: var(--color-success);
}

/* Drag-to-Reorder Styles - NEW v7.9 */
.thumbnail-item.dragging {
    opacity: 0.4;
    border-color: var(--color-primary);
    transform: scale(0.95);
}

.thumbnail-item.drag-over {
    border-color: var(--color-warning);
    background: rgba(255, 193, 7, 0.1);
    transform: translateY(-4px);
}

.thumbnail-drag-handle {
    position: absolute;
    top: 8px;
    left: 8px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    width: 20px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 14px;
    cursor: grab;
    opacity: 0;
    transition: opacity 0.2s;
    user-select: none;
    line-height: 1;
}

.thumbnail-item:hover .thumbnail-drag-handle {
    opacity: 1;
}

.thumbnail-drag-handle:active {
    cursor: grabbing;
}

.thumbnail-reorder-controls {
    display: none;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
    background: rgba(255, 193, 7, 0.1);
}

.btn-save-reorder {
    width: 100%;
    padding: var(--spacing-xs);
    background: var(--color-success);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-save-reorder:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(40, 167, 69, 0.3);
}

.btn-reset-order {
    width: 100%;
    padding: var(--spacing-xs);
    background: var(--color-surface-secondary);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-reset-order:hover {
    background: var(--color-bg);
    border-color: var(--color-warning);
}

.btn-preview {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-surface-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

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

#pageInfo {
    font-size: 13px;
    color: var(--color-text-muted);
    padding: 0 var(--spacing-sm);
    font-weight: 500;
}

.pdf-preview-canvas-container {
    background: #f0f0f0;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    min-height: 400px;
    overflow: auto;
    position: relative;
    text-align: center;
    flex: 1;
}

#pdfPreviewCanvas {
    max-width: 100%;
    height: auto;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    background: white;
    display: inline-block;
    position: relative;
}

/* Signature Overlay in Preview */
.signature-overlay {
    position: absolute;
    border: 3px dashed var(--color-primary);
    background: rgba(3, 102, 214, 0.15);
    cursor: move;
    user-select: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    z-index: 1000;
    display: block;
}

.signature-overlay:hover {
    border-color: var(--color-success);
    background: rgba(40, 167, 69, 0.1);
}

.signature-overlay.dragging {
    opacity: 0.8;
    border-style: solid;
}

.signature-overlay img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    pointer-events: none;
}

.signature-delete-btn {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-danger);
    color: white;
    border: 2px solid white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.2s;
}

.signature-overlay:hover .signature-delete-btn {
    opacity: 1;
}

.pdf-preview-canvas-container {
    position: relative;
}

.info-box {
    padding: var(--spacing-md);
    background: #e7f3ff;
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 13px;
}

.warning-box {
    padding: var(--spacing-md);
    background: #fff3cd;
    border-left: 4px solid var(--color-warning);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 13px;
    color: #856404;
}

/* Smart OCR Detection Badge - NEW v7.12 */
.ocr-detection-badge {
    position: absolute;
    top: 80px;
    right: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 16px;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    cursor: pointer;
    z-index: 1000;
    max-width: 300px;
    animation: slideInRight 0.3s ease;
    transition: all 0.2s;
}

.ocr-detection-badge:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.3);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    .tool-sidebar {
        position: static;
        max-height: none;
    }
}

/* ==================== ENHANCEMENT 1: Card Layout System ==================== */
.card {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.3s ease, transform 0.2s ease;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 16px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Improved section spacing */
section {
    margin-bottom: 32px;
}

/* Better button styling */
.btn {
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ==================== ENHANCEMENT 2: File Info Bar ==================== */
.file-info-bar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 16px 24px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: none;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    animation: slideDown 0.3s ease;
}

.file-info-bar.visible {
    display: flex;
}

.file-info-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
}

.file-info-name {
    font-weight: 700;
    font-size: 15px;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-info-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.file-info-badge.encrypted {
    background: rgba(255, 87, 51, 0.9);
}

.file-info-badge.scanned {
    background: rgba(255, 193, 7, 0.9);
    color: #333;
}

.file-info-badge.large {
    background: rgba(255, 152, 0, 0.9);
}

.file-info-badge.searchable {
    background: rgba(76, 175, 80, 0.9);
}

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

/* ==================== ENHANCEMENT 3: Workflow Steps ==================== */
.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    background: var(--color-bg-secondary);
    border-radius: 12px;
    margin-bottom: 24px;
}

.workflow-step {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    background: white;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.workflow-step .step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-bg-secondary);
    color: var(--color-text-muted);
    font-weight: 700;
    font-size: 12px;
}

.workflow-step.active {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: rgba(102, 126, 234, 0.05);
}

.workflow-step.active .step-number {
    background: var(--color-primary);
    color: white;
}

.workflow-step.completed {
    color: var(--color-success);
    border-color: var(--color-success);
}

.workflow-step.completed .step-number {
    background: var(--color-success);
    color: white;
}

.workflow-arrow {
    color: var(--color-text-muted);
    font-size: 18px;
    font-weight: 300;
}

@media (max-width: 768px) {
    .workflow-steps {
        flex-direction: column;
        gap: 8px;
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
    }
    
    .file-info-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}

/* ==================== v9.2.0 ENHANCEMENTS ==================== */

/* Enhancement #7: Dark Mode */
[data-theme="dark"] {
    --color-primary: #6b8aff;
    --color-primary-hover: #5a7aef;
    --color-success: #4ade80;
    --color-danger: #f87171;
    --color-warning: #fbbf24;
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-secondary: #1a2332;
    --color-border: #334155;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-bg-secondary: #0f172a;
}

[data-theme="dark"] .app-header {
    background: linear-gradient(135deg, #4338ca 0%, #6b21a8 100%);
}

[data-theme="dark"] .drop-area:hover,
[data-theme="dark"] .drop-area.dragover {
    background: #1e293b;
    border-color: var(--color-primary);
}

[data-theme="dark"] .file-item:hover {
    background: #334155;
}

[data-theme="dark"] .card {
    background: var(--color-surface);
    border-color: var(--color-border);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .status-success { background: #064e3b; color: #6ee7b7; border-color: #065f46; }
[data-theme="dark"] .status-error   { background: #450a0a; color: #fca5a5; border-color: #7f1d1d; }
[data-theme="dark"] .status-info    { background: #0c4a6e; color: #7dd3fc; border-color: #075985; }
[data-theme="dark"] .status-warning { background: #451a03; color: #fcd34d; border-color: #78350f; }

[data-theme="dark"] .info-box { background: #1e293b; border-color: var(--color-primary); color: var(--color-text); }
[data-theme="dark"] .warning-box { background: #451a03; border-color: var(--color-warning); color: #fcd34d; }

[data-theme="dark"] .app-footer {
    background: var(--color-surface);
    border-color: var(--color-border);
}

[data-theme="dark"] .footer-bottom { border-color: var(--color-border); }

[data-theme="dark"] .pdf-preview-canvas-container { background: #1a1a2e; }

[data-theme="dark"] .thumbnail-item { background: #334155; }
[data-theme="dark"] .thumbnail-header { background: var(--color-surface-secondary); }

[data-theme="dark"] .tool-button.active {
    background: var(--color-primary);
}

/* Theme toggle button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: 4px 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 18px;
    transition: background 0.2s, transform 0.2s;
    line-height: 1;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.1);
}

/* Enhancement #6: Collapsible Mobile Sidebar */
.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(102, 126, 234, 0.6);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1500;
    opacity: 0;
    transition: opacity 0.3s;
}

.sidebar-overlay.visible {
    display: block;
    opacity: 1;
}

@media (max-width: 768px) {
    .sidebar-toggle {
        display: flex;
    }
    
    .tool-sidebar {
        position: fixed !important;
        top: 0;
        left: 0;
        bottom: 0;
        width: 300px !important;
        max-height: 100vh !important;
        z-index: 1600;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        border-radius: 0 !important;
        box-shadow: 4px 0 16px rgba(0, 0, 0, 0.2);
        overflow-y: auto !important;
    }
    
    .tool-sidebar.sidebar-open {
        transform: translateX(0);
    }
    
    .main-grid {
        grid-template-columns: 1fr !important;
    }
}

/* Enhancement #10: Loading Skeleton */
.app-loading {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s, visibility 0.5s;
}

.app-loading.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.app-loading-icon {
    font-size: 64px;
    margin-bottom: 16px;
    animation: loadingBounce 1.2s ease-in-out infinite;
}

@keyframes loadingBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.app-loading-text {
    color: white;
    font-size: 28px;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-loading-sub {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    margin-top: 8px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.app-loading-bar {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    margin-top: 24px;
    overflow: hidden;
}

.app-loading-bar-fill {
    width: 40%;
    height: 100%;
    background: white;
    border-radius: 2px;
    animation: loadingSlide 1.5s ease-in-out infinite;
}

@keyframes loadingSlide {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

/* Enhancement #17: Offline Indicator */
.offline-indicator {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    background: #fbbf24;
    color: #78350f;
    text-align: center;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    z-index: 9000;
    animation: slideDown 0.3s ease;
}

.offline-indicator.visible {
    display: block;
}

/* Enhancement #16: What's New Modal */
.whats-new-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 8000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.whats-new-overlay.visible {
    display: flex;
}

.whats-new-modal {
    background: var(--color-surface, #fff);
    border-radius: 16px;
    padding: 32px;
    max-width: 480px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalPop 0.3s ease;
    position: relative;
}

@keyframes modalPop {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.whats-new-modal h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 0 0 4px 0;
    color: var(--color-text, #24292e);
}

.version-badge {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
}

.whats-new-list {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
}

.whats-new-list li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--color-text, #24292e);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--color-border, #e1e4e8);
}

.whats-new-list li:last-child { border-bottom: none; }
.whats-new-list li span:first-child { font-size: 18px; flex-shrink: 0; }

.whats-new-close {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.whats-new-close:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

/* Enhancement #8: Keyboard Shortcuts Panel */
.shortcuts-panel {
    display: none;
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: var(--color-surface, #fff);
    border-radius: 12px;
    padding: 24px;
    width: 360px;
    max-width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 8000;
    animation: modalPop 0.2s ease;
}

.shortcuts-panel.visible {
    display: block;
}

.shortcuts-panel h3 {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 16px 0;
    color: var(--color-text, #24292e);
}

.shortcut-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    font-size: 13px;
    color: var(--color-text, #24292e);
    border-bottom: 1px solid var(--color-border, #e1e4e8);
}

.shortcut-row:last-child { border-bottom: none; }

.shortcut-keys {
    display: flex;
    gap: 4px;
}

.shortcut-key {
    display: inline-block;
    background: var(--color-bg, #f6f8fa);
    border: 1px solid var(--color-border, #e1e4e8);
    border-radius: 4px;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: 600;
    font-family: monospace;
    min-width: 24px;
    text-align: center;
}

/* Enhancement #15: File drag-to-reorder */
.file-item[draggable="true"] {
    cursor: grab;
}

.file-item[draggable="true"]:active {
    cursor: grabbing;
}

.file-item.file-dragging {
    opacity: 0.4;
    transform: scale(0.98);
}

.file-item.file-drag-over {
    border-top: 3px solid var(--color-primary);
    margin-top: -3px;
}

.file-drag-handle {
    color: var(--color-text-muted);
    cursor: grab;
    font-size: 16px;
    padding: 0 4px;
    opacity: 0.4;
    transition: opacity 0.2s;
    user-select: none;
}

.file-item:hover .file-drag-handle {
    opacity: 1;
}

/* Enhancement #11: Recently Used section */
.recently-used-section {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

/* Enhancement #20: Screen reader only */
.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;
}

/* Enhancement: Batch ZIP download button */
.batch-download-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: linear-gradient(135deg, #667eea20, #764ba220);
    border: 2px solid #667eea40;
    border-radius: 8px;
    margin-top: 12px;
}

.batch-download-bar .btn {
    white-space: nowrap;
}

/* ==================== v9.3.0 ENHANCEMENTS ==================== */

/* Collapsible sidebar categories */
.category-title.collapsible {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    transition: color 0.2s;
}

.category-title.collapsible::after {
    content: '▾';
    font-size: 12px;
    transition: transform 0.2s;
    opacity: 0.5;
}

.category-title.collapsible.collapsed::after {
    transform: rotate(-90deg);
}

.category-title.collapsible:hover {
    color: var(--color-primary);
}

.category-title.collapsible:hover::after {
    opacity: 1;
}

.category-tools {
    overflow: hidden;
    transition: max-height 0.25s ease, opacity 0.2s;
    max-height: 1000px;
    opacity: 1;
}

.category-tools.collapsed {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

/* Welcome / Home Screen */
.home-screen {
    padding: 0;
}

.home-hero {
    text-align: center;
    padding: 32px 24px 24px;
    background: linear-gradient(135deg, #667eea20 0%, #764ba220 100%);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
}

.home-hero h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 8px 0;
}

.home-hero p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0;
}

.home-categories {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.home-category-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 10px 0;
    display: flex;
    align-items: center;
    gap: 6px;
}

.home-tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(155px, 1fr));
    gap: 10px;
}

.home-tool-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: 10px;
    padding: 14px 12px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.home-tool-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.home-tool-card:active {
    transform: translateY(0);
}

.home-tool-card .tool-card-icon {
    font-size: 26px;
    line-height: 1;
}

.home-tool-card .tool-card-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.3;
}

.home-tool-card .tool-card-desc {
    font-size: 10px;
    color: var(--color-text-muted);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (max-width: 768px) {
    .home-tool-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: 8px;
    }
    .home-tool-card {
        padding: 10px 8px;
    }
}

/* Typed signature */
.sig-type-container {
    margin-top: 12px;
    padding: 16px;
    background: var(--color-surface-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.sig-type-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
    margin-bottom: 10px;
}

.sig-type-input:focus {
    border-color: var(--color-primary);
}

.sig-font-select {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.sig-font-btn {
    padding: 6px 12px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s;
    line-height: 1.2;
}

.sig-font-btn:hover {
    border-color: var(--color-primary);
}

.sig-font-btn.active {
    border-color: var(--color-primary);
    background: rgba(3, 102, 214, 0.08);
}

.sig-preview-canvas {
    width: 100%;
    height: 80px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: white;
}

/* Crop tool */
.crop-canvas-container {
    position: relative;
    display: inline-block;
    margin: 12px 0;
}

.crop-canvas-container canvas {
    max-width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: block;
}

/* ==================== v9.4.0 ENHANCEMENTS ==================== */

/* Home button in sidebar */
.home-button {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 12px 14px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.home-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.home-button:active {
    transform: translateY(0);
}

.home-button.active {
    background: linear-gradient(135deg, #5a6fd0 0%, #653d8f 100%);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.5);
}

.home-button-icon {
    font-size: 18px;
    line-height: 1;
}

.home-button-label {
    flex: 1;
    text-align: left;
}

[data-theme="dark"] .home-button {
    background: linear-gradient(135deg, #4338ca 0%, #6b21a8 100%);
}

/* Hide home button label on narrow mobile to save space */
@media (max-width: 480px) {
    .home-button-label {
        font-size: 13px;
    }
}

/* ==================== v9.5.1 ENHANCEMENTS ==================== */

/* Welcome banner on home screen */
.home-welcome {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 48px 16px 18px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
    animation: slideDown 0.4s ease;
}

.home-welcome-icon {
    font-size: 28px;
    line-height: 1;
    flex-shrink: 0;
}

.home-welcome-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.home-welcome-content strong {
    font-size: 15px;
    font-weight: 700;
}

.home-welcome-content span {
    font-size: 13px;
    opacity: 0.95;
    line-height: 1.5;
}

.home-welcome-close {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.home-welcome-close:hover {
    background: rgba(255, 255, 255, 0.35);
}

/* Search bar on home screen */
.home-search-wrap {
    margin-top: 16px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.home-search-input {
    width: 100%;
    padding: 12px 18px;
    font-size: 15px;
    border: 2px solid var(--color-border);
    border-radius: 10px;
    background: var(--color-surface);
    color: var(--color-text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: var(--font-sans);
}

.home-search-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.12);
}

[data-theme="dark"] .home-search-input {
    background: var(--color-surface-secondary);
}

/* Popular tools section */
.home-popular {
    margin-bottom: 24px;
    padding: 20px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border: 2px solid rgba(102, 126, 234, 0.15);
    border-radius: 12px;
}

[data-theme="dark"] .home-popular {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.10), rgba(118, 75, 162, 0.10));
    border-color: rgba(102, 126, 234, 0.25);
}

.home-popular-grid {
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}

.home-tool-card-popular {
    border-color: rgba(102, 126, 234, 0.30);
    background: var(--color-surface);
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.12);
}

.home-tool-card-popular:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.20);
}

/* Empty state when search returns no home cards */
.home-empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .home-welcome {
        padding: 14px 44px 14px 14px;
        gap: 10px;
    }
    .home-welcome-icon {
        font-size: 22px;
    }
    .home-welcome-content strong {
        font-size: 14px;
    }
    .home-welcome-content span {
        font-size: 12px;
    }
}

/* ==================== v9.5.2 ENHANCEMENTS ==================== */

/* Tool card badges (NEW / POPULAR) */
.home-tool-card {
    position: relative;
}

.tool-card-badge {
    position: absolute;
    top: 6px;
    right: 6px;
    font-size: 9px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 8px;
    letter-spacing: 0.5px;
    line-height: 1;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.tool-card-badge-new {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

.tool-card-badge-popular {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
}

[data-theme="dark"] .tool-card-badge {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* ==================== v9.6.0 — UI/UX OVERHAUL ==================== */

/* ---- Rec #9: Display font for title ---- */
.app-title {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif !important;
    font-size: 32px !important;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ---- Rec #5: Settings dropdown ---- */
.header-icon-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: 6px 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
    transition: background 0.2s, transform 0.2s;
}

.header-icon-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.1);
}

.header-tagline-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.settings-dropdown-wrap {
    position: relative;
}

.settings-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--color-surface, #fff);
    border: 2px solid var(--color-border, #e1e4e8);
    border-radius: 10px;
    padding: 12px 0;
    min-width: 250px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    z-index: 5000;
}

.settings-dropdown.visible {
    display: block;
    animation: modalPop 0.2s ease;
}

.settings-dropdown-title {
    font-weight: 700;
    font-size: 13px;
    padding: 0 16px 8px;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 8px;
}

.settings-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    color: var(--color-text);
    transition: background 0.15s;
}

.settings-item:hover {
    background: var(--color-bg-secondary);
}

.settings-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.settings-divider {
    height: 1px;
    background: var(--color-border);
    margin: 6px 0;
}

.settings-item-btn {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px 16px;
    font-size: 14px;
    cursor: pointer;
    color: var(--color-text);
    background: none;
    border: none;
    transition: background 0.15s;
    font-family: inherit;
}

.settings-item-btn:hover {
    background: var(--color-bg-secondary);
}

/* ---- Rec #10: Trust strip ---- */
.trust-strip {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-muted);
    flex-wrap: wrap;
}

.trust-item {
    white-space: nowrap;
}

.trust-divider {
    opacity: 0.3;
}

[data-theme="dark"] .trust-strip {
    background: var(--color-surface-secondary);
}

@media (max-width: 768px) {
    .trust-strip { font-size: 11px; gap: 6px; padding: 6px 12px; }
}

/* ---- Rec #1: Bigger tool cards ---- */
.home-tool-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 14px;
}

.home-tool-card {
    padding: 18px 14px;
    border-radius: 12px;
    border-width: 2px;
    gap: 8px;
}

.home-tool-card .tool-card-icon {
    font-size: 32px;
}

.home-tool-card .tool-card-name {
    font-size: 13px;
    font-weight: 700;
    font-family: 'DM Sans', var(--font-sans);
}

.home-tool-card .tool-card-desc {
    font-size: 11px;
    line-height: 1.4;
}

.home-popular-grid {
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
}

@media (max-width: 768px) {
    .home-tool-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
    .home-tool-card { padding: 14px 10px; }
    .home-tool-card .tool-card-icon { font-size: 28px; }
}

/* ---- Rec #2: Category accent colors ---- */
.home-tool-card[data-cat="basic"]      { border-left: 4px solid #3b82f6; }
.home-tool-card[data-cat="sigforms"]   { border-left: 4px solid #6366f1; }
.home-tool-card[data-cat="security"]   { border-left: 4px solid #10b981; }
.home-tool-card[data-cat="conversion"] { border-left: 4px solid #f59e0b; }
.home-tool-card[data-cat="advanced"]   { border-left: 4px solid #8b5cf6; }
.home-tool-card[data-cat="batch"]      { border-left: 4px solid #f43f5e; }
.home-tool-card[data-cat="automation"] { border-left: 4px solid #06b6d4; }
.home-tool-card[data-cat="popular"]    { border-left: 4px solid #f59e0b; }

/* ---- Rec #12: Category colors in sidebar ---- */
.category-tools[data-category="basic"] .tool-button.active      { background: #3b82f6; }
.category-tools[data-category="sigforms"] .tool-button.active   { background: #6366f1; }
.category-tools[data-category="security"] .tool-button.active   { background: #10b981; }
.category-tools[data-category="conversion"] .tool-button.active { background: #f59e0b; color: #1a1a1a; }
.category-tools[data-category="advanced"] .tool-button.active   { background: #8b5cf6; }
.category-tools[data-category="batch"] .tool-button.active      { background: #f43f5e; }
.category-tools[data-category="automation"] .tool-button.active { background: #06b6d4; }

/* ---- Rec #4: Bigger, more inviting drop zone ---- */
.drop-area {
    padding: 48px 32px !important;
    border-width: 3px !important;
    transition: all 0.3s !important;
}

.drop-area-icon {
    font-size: 64px !important;
    margin-bottom: 16px !important;
    transition: transform 0.3s;
}

.drop-area:hover .drop-area-icon,
.drop-area.dragover .drop-area-icon {
    transform: translateY(-6px);
    animation: dropBounce 0.6s ease infinite;
}

@keyframes dropBounce {
    0%, 100% { transform: translateY(-6px); }
    50% { transform: translateY(-14px); }
}

.drop-area-text {
    font-size: 18px !important;
    font-weight: 600 !important;
    font-family: 'DM Sans', var(--font-sans);
}

.drop-area:hover, .drop-area.dragover {
    border-color: var(--color-primary) !important;
    box-shadow: 0 0 0 4px rgba(3, 102, 214, 0.1);
    transform: scale(1.005) !important;
}

/* ---- Rec #3: Condensed footer ---- */
.app-footer-v2 {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 16px 24px;
    text-align: center;
    margin-top: 32px;
    border-radius: var(--radius-lg);
}

.footer-trust {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 8px;
}

.footer-links {
    font-size: 12px;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-sep {
    opacity: 0.3;
}

[data-theme="dark"] .app-footer-v2 {
    background: var(--color-surface);
    border-color: var(--color-border);
}

/* ---- Rec #7: Result card ---- */
.result-card {
    margin-top: 16px;
    padding: 20px;
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border: 2px solid #28a745;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    animation: slideIn 0.3s ease;
}

[data-theme="dark"] .result-card {
    background: linear-gradient(135deg, #064e3b 0%, #065f46 100%);
    border-color: #10b981;
}

.result-card-icon {
    font-size: 36px;
    flex-shrink: 0;
}

.result-card-content {
    flex: 1;
    min-width: 200px;
}

.result-card-title {
    font-weight: 700;
    font-size: 16px;
    color: #155724;
    font-family: 'DM Sans', var(--font-sans);
}

[data-theme="dark"] .result-card-title { color: #6ee7b7; }

.result-card-detail {
    font-size: 13px;
    color: #1e7e34;
    margin-top: 4px;
}

[data-theme="dark"] .result-card-detail { color: #a7f3d0; }

.result-card-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ---- Rec #8: Sticky process button on mobile ---- */
@media (max-width: 768px) {
    .btn-group {
        position: sticky;
        bottom: 0;
        z-index: 100;
        background: var(--color-surface);
        padding: 12px 0 4px;
        border-top: 1px solid var(--color-border);
        margin: 0 -16px;
        padding-left: 16px;
        padding-right: 16px;
    }
}

/* ---- Rec #10: Hide tool config until file uploaded ---- */
.tool-config-hidden {
    opacity: 0.4;
    pointer-events: none;
    position: relative;
}

.tool-config-hidden::after {
    content: '📤 Upload a file above to configure this tool';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--color-surface);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    white-space: nowrap;
    z-index: 10;
}

/* ---- Rec #11: About & Privacy modal ---- */
.about-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 8000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.about-overlay.visible {
    display: flex;
}

.about-modal {
    background: var(--color-surface, #fff);
    border-radius: 16px;
    padding: 32px;
    max-width: 520px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalPop 0.3s ease;
    position: relative;
    color: var(--color-text);
}

.about-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-text-muted);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.about-close:hover {
    background: var(--color-bg-secondary);
}

.about-modal h2 {
    font-family: 'DM Sans', var(--font-sans);
    font-size: 22px;
    font-weight: 700;
    margin: 0;
}

.about-section {
    margin-top: 16px;
}

.about-section h3 {
    font-size: 14px;
    font-weight: 700;
    margin: 0 0 6px 0;
}

.about-section p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-muted);
    margin: 0;
}

/* Hide the old footer if it still exists */
.app-footer { display: none !important; }