/* Professional PDF Editor - Modern Design System */

/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --success-color: #28a745;
    --success-hover: #1e7e34;
    --warning-color: #ffc107;
    --warning-hover: #e0a800;
    --danger-color: #dc3545;
    --danger-hover: #c82333;
    --secondary-color: #6c757d;
    --secondary-hover: #545b62;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-400: #adb5bd;
    --gray-500: #6c757d;
    --gray-600: #495057;
    --gray-700: #343a40;
    --gray-800: #212529;
    --gray-900: #000000;
    
    /* Layout */
    --sidebar-width: 320px;
    --header-height: 72px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--gray-700);
    background-color: var(--gray-50);
    margin: 0;
    padding: 0;
}

/* Application Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Professional Header */
.app-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-6);
    max-width: 1400px;
    margin: 0 auto;
    gap: var(--spacing-4);
}

.brand-section .brand-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--gray-800);
    font-weight: 600;
    font-size: var(--font-size-lg);
    transition: var(--transition-base);
}

.brand-section .brand-link:hover {
    color: var(--primary-color);
}

.brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-3);
    color: var(--white);
    font-size: 18px;
}

.brand-text {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* User Menu */
.user-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition-base);
}

.user-button:hover {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 14px;
}

.user-email {
    font-weight: 500;
}

/* Header Controls */
.header-controls {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 500px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
}

.header-control-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-1);
}

.header-control-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 14px;
}

.header-control-btn:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-800);
}

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

.control-label {
    font-size: 10px;
    color: var(--gray-600);
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    line-height: 1;
}

.header-control-item:hover .control-label {
    color: var(--gray-800);
}

/* Main Application Body */
.app-body {
    display: flex;
    flex: 1;
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

/* Modern Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    z-index: 100;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-6);
    scrollbar-width: thin;
    scrollbar-color: var(--gray-300) transparent;
}

.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background-color: var(--gray-300);
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background-color: var(--gray-400);
}

.sidebar-section {
    margin-bottom: var(--spacing-8);
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--gray-100);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.action-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.action-button:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Compact Document Actions Grid */
.document-actions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2);
}

.doc-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    color: var(--gray-700);
    font-weight: 500;
    font-size: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 50px;
    text-align: center;
}

.doc-action-btn i {
    font-size: 14px;
    margin-bottom: 2px;
}

.doc-action-btn span {
    font-size: 9px;
    line-height: 1;
    white-space: nowrap;
}

.doc-action-btn:hover:not(:disabled) {
    background: var(--gray-50);
    border-color: var(--gray-300);
    transform: translateY(-1px);
}

.doc-action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Compact Editing Tools Grid */
.editing-tools-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2);
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-1);
    padding: var(--spacing-2);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-sm);
    color: var(--gray-700);
    font-weight: 500;
    font-size: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 50px;
    text-align: center;
    position: relative;
}

.tool-btn input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.tool-btn i {
    font-size: 14px;
    margin-bottom: 2px;
}

.tool-btn span {
    font-size: 9px;
    line-height: 1;
    white-space: nowrap;
}

.tool-btn:hover {
    background: var(--gray-50);
    border-color: var(--gray-300);
    transform: translateY(-1px);
}

.tool-btn input[type="radio"]:checked + i,
.tool-btn:has(input[type="radio"]:checked) {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.tool-btn:has(input[type="radio"]:checked) i,
.tool-btn:has(input[type="radio"]:checked) span {
    color: var(--white);
}

.action-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.action-text {
    font-weight: 500;
}

/* Color-coded actions */
.action-upload {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: var(--white);
}

.action-upload:hover {
    color: var(--white);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
}

.action-save {
    border-color: var(--success-color);
}

.action-save:hover {
    border-color: var(--success-hover);
    background: var(--success-color);
    color: var(--white);
}

.action-export {
    border-color: var(--success-color);
}

.action-export:hover {
    border-color: var(--success-hover);
    background: var(--success-color);
    color: var(--white);
}

.action-combine {
    border-color: var(--secondary-color);
}

.action-combine:hover {
    border-color: var(--secondary-hover);
    background: var(--secondary-color);
    color: var(--white);
}

/* Tool Selection */
.tool-selection {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.tool-option {
    margin-bottom: 0;
}

.tool-label {
    display: flex;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-base);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: 0;
    width: 100%;
}

.tool-label:hover {
    background: var(--gray-100);
    border-color: var(--primary-color);
}

.form-check-input:checked + .tool-label {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

/* Control Buttons */
.control-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.control-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    color: var(--gray-700);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
}

.control-button:hover:not(:disabled) {
    background: var(--gray-100);
    border-color: var(--gray-300);
}

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

.close-button:hover:not(:disabled) {
    background: var(--danger-color);
    border-color: var(--danger-color);
    color: var(--white);
}

/* View Controls */
.view-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--spacing-1);
}

.zoom-button {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--gray-600);
}

.zoom-button:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-800);
}

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

.zoom-level {
    padding: 0 var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--gray-700);
    min-width: 60px;
    text-align: center;
}

/* Drawing Tools */
.drawing-tools {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.tool-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.tool-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.color-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.color-picker {
    width: 40px;
    height: 40px;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-base);
}

.color-picker:hover {
    border-color: var(--primary-color);
}

.apply-button {
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
}

.apply-button:hover {
    background: var(--primary-hover);
}

.brush-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--gray-200);
    outline: none;
    cursor: pointer;
}

.brush-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid var(--white);
    box-shadow: var(--shadow-sm);
}

.brush-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid var(--white);
    box-shadow: var(--shadow-sm);
}

.clear-button:hover:not(:disabled) {
    background: var(--warning-color);
    border-color: var(--warning-color);
    color: var(--gray-800);
}

/* Page Navigator - Expanded */
.page-navigator {
    max-height: 500px; /* Increased from 300px */
    min-height: 200px; /* Minimum height for consistency */
    overflow-y: auto;
    padding: var(--spacing-3);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-6);
    color: var(--gray-500);
    font-size: var(--font-size-sm);
    text-align: center;
}

.empty-state i {
    font-size: 2rem;
    margin-bottom: var(--spacing-3);
    opacity: 0.6;
}

.page-hint {
    margin-top: var(--spacing-3);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--gray-100);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    color: var(--gray-600);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    margin-left: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    padding: var(--spacing-6);
    overflow-y: auto;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--gray-300) transparent;
}

.canvas-container::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.canvas-container::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 4px;
}

.canvas-container::-webkit-scrollbar-thumb {
    background-color: var(--gray-300);
    border-radius: 4px;
}

.canvas-container::-webkit-scrollbar-thumb:hover {
    background-color: var(--gray-400);
}

.canvas-container::-webkit-scrollbar-corner {
    background: var(--gray-100);
}

.pdf-canvas {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    min-height: calc(100vh - var(--header-height) - 3rem);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* Professional Empty State */
.empty-state-main {
    text-align: center;
    padding: var(--spacing-16) var(--spacing-8);
    max-width: 600px;
}

.empty-illustration {
    margin-bottom: var(--spacing-8);
    opacity: 0.8;
}

.empty-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--spacing-4);
    line-height: 1.2;
}

.empty-description {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    margin-bottom: var(--spacing-8);
    line-height: 1.6;
}

.empty-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
}

.primary-upload-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-8);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--white);
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.primary-upload-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    color: var(--white);
}

.primary-upload-button i {
    font-size: 1.25rem;
}

.upload-hint {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    font-style: italic;
}

/* Vertical View Controls Panel */
.view-controls-panel {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    z-index: 100;
}

.zoom-controls-vertical {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-1);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--spacing-2);
    box-shadow: var(--shadow-lg);
    width: 48px;
}

.zoom-btn-vertical {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 12px;
}

.zoom-btn-vertical:hover:not(:disabled) {
    background: var(--gray-100);
    color: var(--gray-800);
}

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

.zoom-level-vertical {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--gray-700);
    text-align: center;
    padding: var(--spacing-1) 0;
    min-height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn-vertical {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    color: var(--danger-color);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: 12px;
    margin-top: var(--spacing-2);
    border-top: 1px solid var(--gray-200);
    padding-top: var(--spacing-2);
}

.close-btn-vertical:hover:not(:disabled) {
    background: var(--danger-color);
    color: var(--white);
}

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

/* Delete selection rectangle */
.selection-rectangle {
    position: absolute;
    border: 2px dashed #dc3545;
    background-color: rgba(220, 53, 69, 0.1);
    pointer-events: none;
    z-index: 30;
}

/* Word conversion loading overlay */
.conversion-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    color: white;
}

.conversion-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

.conversion-text {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* PDF Page Styles */
.page-container {
    display: inline-block;
    position: relative;
    margin: var(--spacing-6) auto;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    background: var(--white);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-base);
}

.page-container:hover {
    box-shadow: var(--shadow-lg);
}

.page-image {
    max-width: 100%;
    height: auto;
    display: block;
    cursor: crosshair;
}

/* Mode-specific cursors */
.page-container.mode-view .page-image {
    cursor: default;
}

.page-container.mode-text .page-image {
    cursor: crosshair;
}

.page-container.mode-delete .page-image {
    cursor: crosshair;
}

.page-container.mode-draw .page-image {
    cursor: crosshair;
}

/* Text Overlays */
.text-overlay {
    position: absolute;
    background: transparent;
    border: none;
    cursor: move;
    min-width: 20px;
    min-height: 20px;
    padding: var(--spacing-1);
    font-size: 12px;
    color: var(--gray-900);
    word-wrap: break-word;
    z-index: 25;
    transform-origin: top left;
    transition: var(--transition-fast);
    user-select: none;
    font-family: Arial, sans-serif;
}

.text-overlay:hover {
    background: rgba(255, 193, 7, 0.2);
    border: 1px dashed var(--warning-color);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-2);
    box-shadow: var(--shadow-sm);
}

.text-overlay:active {
    cursor: grabbing;
}

.text-overlay.dragging {
    opacity: 0.7;
    transform: rotate(2deg);
}

/* Deletion Overlays */
.deletion-overlay {
    position: absolute;
    background: rgba(220, 53, 69, 0.7);
    border: 3px solid var(--danger-color);
    z-index: 15;
    animation: deletePulse 0.5s ease-in;
    box-shadow: 0 0 10px rgba(220, 53, 69, 0.5);
}

@keyframes deletePulse {
    0% { 
        opacity: 0;
        transform: scale(0.9);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.white-deletion-overlay {
    position: absolute;
    background: var(--white);
    border: none;
    z-index: 20;
    animation: deleteFlash 0.3s ease-in;
}

@keyframes deleteFlash {
    0% { 
        background: rgba(220, 53, 69, 0.8);
    }
    100% {
        background: var(--white);
    }
}

/* Drawing Canvas */
.drawing-canvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 30;
    pointer-events: none;
    border-radius: var(--border-radius);
}

.drawing-canvas.drawing-mode {
    pointer-events: auto;
    cursor: crosshair;
}

.page-container.mode-draw .drawing-canvas {
    pointer-events: auto;
}

.page-container:not(.mode-draw) .drawing-canvas {
    pointer-events: none;
}

/* Page Thumbnails - Improved for larger navigator */
.page-thumbnail {
    width: 100%;
    height: 140px; /* Increased from 120px */
    object-fit: cover;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-base);
    border: 2px solid var(--gray-200);
}

.page-thumbnail:hover {
    transform: scale(1.02);
    border-color: var(--primary-color);
}

.page-thumbnail.dragging {
    opacity: 0.7;
    transform: scale(0.98);
    z-index: 1000;
}

.page-thumbnail.drop-target {
    border-color: var(--primary-color);
    background-color: rgba(0, 123, 255, 0.1);
}

.thumbnail-container {
    border: none;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-3); /* Increased padding */
    background: var(--white);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-4); /* Increased margin */
    transition: var(--transition-base);
}

.thumbnail-container:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.page-number-badge {
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    min-width: 18px;
    text-align: center;
    padding: var(--spacing-1) var(--spacing-2);
    background: rgba(0, 0, 0, 0.7);
    color: var(--white);
    position: absolute;
    top: var(--spacing-1);
    left: var(--spacing-1);
}

/* Drag Placeholder */
.drag-placeholder {
    border: 2px dashed var(--primary-color);
    background: rgba(0, 123, 255, 0.05);
    border-radius: var(--border-radius);
    height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    margin: var(--spacing-2) 0;
    font-weight: 500;
}

/* Status Messages */
#status-container {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    z-index: 1050;
    max-width: 400px;
}

.status-message {
    padding: var(--spacing-4);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-3);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Modal Improvements */
.modal-content {
    border-radius: var(--border-radius-lg);
    border: none;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-6);
}

.modal-body {
    padding: var(--spacing-6);
}

.modal-footer {
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-6);
    gap: var(--spacing-3);
}

/* Form Controls */
.form-control,
.form-select {
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-300);
    padding: var(--spacing-3);
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.form-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--spacing-2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: var(--header-height);
        height: calc(100vh - var(--header-height));
        z-index: 999;
        transition: left var(--transition-base);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .main-content {
        width: 100%;
        margin-left: 0;
    }
    
    .canvas-container {
        padding: var(--spacing-4);
    }
    
    .empty-state-main {
        padding: var(--spacing-8) var(--spacing-4);
    }
    
    .empty-title {
        font-size: var(--font-size-2xl);
    }
    
    .header-content {
        padding: 0 var(--spacing-4);
    }
    
    /* Hide header controls on small screens to save space */
    .header-controls {
        display: none;
    }
    
    /* Adjust view controls panel for mobile */
    .view-controls-panel {
        bottom: var(--spacing-4);
        right: var(--spacing-4);
    }
    
    .zoom-controls-vertical {
        width: 44px;
    }
    
    .zoom-btn-vertical,
    .close-btn-vertical {
        width: 28px;
        height: 28px;
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .sidebar-content {
        padding: var(--spacing-4);
    }
    
    .action-button {
        padding: var(--spacing-3);
    }
    
    .primary-upload-button {
        padding: var(--spacing-3) var(--spacing-6);
        font-size: var(--font-size-base);
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .app-header {
        display: none;
    }
    
    .main-content {
        width: 100%;
        margin-left: 0;
    }
    
    .pdf-canvas {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}

/* Animation for drawing controls */
.drawing-controls-panel {
    animation: slideDown 0.3s ease-in-out;
}

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

/* Accessibility improvements */
.action-button:focus,
.control-button:focus,
.tool-label:focus,
.zoom-button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --gray-100: #f0f0f0;
        --gray-200: #d0d0d0;
        --gray-300: #b0b0b0;
        --gray-400: #909090;
        --gray-500: #707070;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Signature and Stamp Styles */
.signature-panel {
    transition: var(--transition-base);
}

.signature-canvas-container {
    position: relative;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    background: var(--white);
    overflow: hidden;
}

#signature-canvas {
    display: block;
    cursor: crosshair;
    touch-action: none;
}

.signature-drawing-controls {
    background: var(--gray-50);
    padding: var(--spacing-4);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.signature-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    transition: var(--transition-base);
}

#signature-preview-text {
    transition: all var(--transition-base);
}

/* Stamp Grid Styles */
.stamp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-4);
    margin: var(--spacing-4) 0;
}

.stamp-item {
    cursor: pointer;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    padding: var(--spacing-3);
    transition: var(--transition-base);
    background: var(--gray-50);
}

.stamp-item:hover {
    border-color: var(--primary-color);
    background: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stamp-item.selected {
    border-color: var(--primary-color);
    background: rgba(0, 123, 255, 0.1);
}

.stamp-preview {
    text-align: center;
    font-weight: bold;
    font-size: 14px;
    padding: var(--spacing-3);
    border-radius: var(--border-radius-sm);
    border: 2px solid currentColor;
    transform: rotate(-5deg);
    font-family: 'Arial Black', Arial, sans-serif;
    letter-spacing: 1px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.stamp-preview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: currentColor;
    opacity: 0.1;
    z-index: -1;
}

.stamp-preview.approved { color: #28a745; }
.stamp-preview.rejected { color: #dc3545; }
.stamp-preview.confidential { color: #6f42c1; }
.stamp-preview.urgent { color: #dc3545; }
.stamp-preview.paid { color: #28a745; }
.stamp-preview.draft { color: #6c757d; }
.stamp-preview.copy { color: #17a2b8; }
.stamp-preview.original { color: #ffc107; }

/* Signature and Stamp on PDF overlays */
.signature-overlay {
    position: absolute;
    cursor: move;
    z-index: 25;
    transition: var(--transition-fast);
    user-select: none;
    padding: var(--spacing-1);
    border-radius: var(--border-radius-sm);
}

.signature-overlay:hover {
    background: rgba(0, 123, 255, 0.1);
    border: 1px dashed var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.signature-overlay.dragging {
    opacity: 0.8;
    transform: rotate(1deg);
    z-index: 50;
}

.stamp-overlay {
    position: absolute;
    cursor: move;
    z-index: 25;
    transition: var(--transition-fast);
    user-select: none;
    padding: var(--spacing-2);
    border-radius: var(--border-radius-sm);
}

.stamp-overlay:hover {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
}

.stamp-overlay.dragging {
    opacity: 0.8;
    z-index: 50;
}

/* Signature mode cursor */
.page-container.mode-signature .page-image {
    cursor: crosshair;
}

.page-container.mode-stamp .page-image {
    cursor: crosshair;
}

/* Signature tools font imports */
@import url('https://fonts.googleapis.com/css2?family=Dancing+Script:wght@400;700&family=Great+Vibes&family=Allura&family=Pacifico&display=swap');

/* Make font controls update preview in real-time */
.signature-type-selector .btn-check:checked + .btn {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}