/* ==================== */
/* CSS Variables & Reset */
/* ==================== */
:root {
    /* Colors - Light Mode */
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f3f5;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.18);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    /* Colors - Dark Mode */
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252b3b;
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);

    /* Glass Effect */
    --glass-bg: rgba(26, 31, 46, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition-normal), color var(--transition-normal);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==================== */
/* Header */
/* ==================== */
.header {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo i {
    font-size: 1.75rem;
    -webkit-text-fill-color: var(--accent-primary);
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Hide mobile menu toggle on desktop by default */
.mobile-menu-toggle {
    display: none;
}


/* ==================== */
/* Editor Toolbar */
/* ==================== */
.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    max-width: 800px;
}

.toolbar-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.toolbar-btn:hover:not(:disabled) {
    background: var(--accent-primary);
    color: white;
}

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

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

.toolbar-btn-success:hover:not(:disabled) {
    background: #059669;
}

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

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

.toolbar-btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

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

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

.toolbar-btn-warning:hover:not(:disabled) {
    background: #d97706;
}

.toolbar-btn-warning:disabled {
    background: #6b7280;
    color: #9ca3af;
    opacity: 0.6;
    cursor: not-allowed;
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 0.25rem;
}

/* ==================== */
/* Buttons */
/* ==================== */
.btn-primary,
.btn-secondary,
.btn-icon,
.tool-btn,
.btn-success,
.btn-danger {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(239, 68, 68, 0.4);
}

/* ==================== */
/* Upload Section */
/* ==================== */
.upload-section {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
}

.upload-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 4rem 3rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 100%;
    transition: all var(--transition-normal);
}

.upload-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 48px rgba(99, 102, 241, 0.2);
}

.upload-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 2rem;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    color: white;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.upload-card h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.upload-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.upload-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.upload-actions .btn-primary {
    flex: 1;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    justify-content: center;
    min-width: 0;
    white-space: nowrap;
}

.supported-formats {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 50px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.supported-formats i {
    color: var(--success);
}

/* ==================== */
/* Editor Section */
/* ==================== */
.editor-section {
    padding: 0;
    min-height: calc(100vh - 70px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 1.5rem;
    width: 100%;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 2rem 2rem 4rem 2rem;
    max-width: 600px;
}

.empty-icon {
    font-size: 5rem;
    color: #ef4444;
    margin-bottom: 1.5rem;
    opacity: 0.8;
}


.empty-state h2 {
    font-size: 2rem;
    color: var(--text-primary);
    margin: 0 0 0.5rem 0;
    font-weight: 600;
}

.empty-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 0 2rem 0;
    line-height: 1.6;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2.5rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    cursor: default;
}

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

.feature-item i {
    font-size: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.feature-item span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

/* Responsive for features grid */
@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.empty-state p:not(.empty-description) {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin: 0 0 2.5rem 0;
    line-height: 1.6;
}

.empty-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    max-width: 700px;
    margin: 0 auto;
}

.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 0;
    white-space: nowrap;
}

/* ==================== */
/* Pages Container */
/* ==================== */

/* Pages Info Bar */
.pages-info-bar {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    padding: 0.75rem 1.5rem;
    margin: 0.5rem 0 1.5rem 0;
    width: 100%;
    min-width: 500px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

/* Documents Section (Tabs) */
.info-item.documents-section {
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    overflow: hidden;
    min-width: 0;
    padding-right: 0.5rem;
}

.documents-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 2px 0;
    scrollbar-width: thin;
}

.documents-list::-webkit-scrollbar {
    height: 3px;
}

.documents-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.document-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.6rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-fast);
    user-select: none;
    max-width: 200px;
    position: relative;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.document-tab:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.document-tab.active {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.document-tab .doc-name {
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
}

.document-tab .close-doc-btn {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 0.2rem;
    font-size: 0.75rem;
    opacity: 0.5;
    transition: all 0.2s;
    cursor: pointer;
}

.document-tab .close-doc-btn:hover {
    background: var(--error-color);
    color: white;
    opacity: 1;
}

/* Add Document Button */
.add-doc-btn {
    width: 30px;
    height: 30px;
    border-radius: 6px;
    border: 1px dashed var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.add-doc-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: rgba(78, 173, 249, 0.1);
}

.toggle-pages-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    margin-right: 0.5rem;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.toggle-pages-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.toggle-pages-btn i {
    font-size: 0.9rem !important;
    /* Override generic icon size */
    transition: transform var(--transition-fast);
}

.toggle-pages-btn.collapsed i {
    transform: rotate(180deg);
}

.info-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.info-item i {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.info-item:nth-child(1) i {
    color: var(--accent-primary);
}

.info-item:nth-child(2) i {
    color: var(--success);
}

.info-item:nth-child(3) i {
    color: var(--danger);
}

.info-item span {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.pages-container {
    padding: 2rem 1rem;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    margin: 0;
    width: 100%;
    transition: all 0.5s ease;
    /* Smooth transition */
}

/* Collapsed Pages (Stack/Book View) */
.pages-container.collapsed {
    display: flex !important;
    /* Override JS inline style */
    justify-content: center;
    align-items: center;
    min-height: 350px;
    padding: 2rem;
    perspective: 1000px;
    gap: 0;
}

.pages-container.collapsed .page-item {
    display: none;
    /* Hide all by default */
    position: absolute;
    width: 220px;
    /* Fixed width for icon/card view */
    background: var(--bg-secondary);
    box-shadow: -5px 5px 15px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    border: 1px solid var(--border-color);
}

.pages-container.collapsed .page-item canvas {
    width: 100% !important;
    height: auto !important;
}

/* Hide controls in collapsed mode */
.pages-container.collapsed .page-controls,
.pages-container.collapsed .page-checkbox,
.pages-container.collapsed .page-number {
    display: none;
}

/* Show top 5 items */
.pages-container.collapsed .page-item:nth-child(-n+5) {
    display: block;
}

/* Stack Effect */
.pages-container.collapsed .page-item:nth-child(1) {
    z-index: 10;
    transform: translateX(0) scale(1.0);
}

.pages-container.collapsed .page-item:nth-child(2) {
    z-index: 9;
    transform: translateX(6px) translateY(4px) rotate(2deg) scale(0.98);
    filter: brightness(0.95);
}

.pages-container.collapsed .page-item:nth-child(3) {
    z-index: 8;
    transform: translateX(12px) translateY(8px) rotate(4deg) scale(0.96);
    filter: brightness(0.9);
}

.pages-container.collapsed .page-item:nth-child(4) {
    z-index: 7;
    transform: translateX(18px) translateY(12px) rotate(6deg) scale(0.94);
    filter: brightness(0.85);
}

.pages-container.collapsed .page-item:nth-child(5) {
    z-index: 6;
    transform: translateX(24px) translateY(16px) rotate(8deg) scale(0.92);
    filter: brightness(0.8);
}

/* Custom Scrollbar for Body */
body::-webkit-scrollbar {
    width: 8px;
}

body::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

body::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 10px;
}

.page-item {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.page-item:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.page-item.selected {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    border-width: 2px;
}

.page-item.deleted {
    opacity: 0.5;
}

.page-item.deleted canvas {
    pointer-events: none;
}

.page-item.deleted::after {
    content: 'SİLİNDİ';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-45deg);
    font-size: 2rem;
    font-weight: bold;
    color: var(--danger);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    z-index: 100;
    pointer-events: none;
}

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

/* Canvas Wrapper for Overlay */
.page-canvas-wrapper {
    position: relative;
    width: 100%;
    border-radius: 4px;
    overflow: hidden;
}

.page-number {
    position: absolute;
    top: 0.25rem;
    left: 0.25rem;
    background: var(--accent-primary);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    max-width: calc(100% - 3rem);
}

/* Merged PDF Page Number Styles */
.page-number .page-source-doc {
    font-size: 0.65rem;
    font-weight: 700;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.page-number .page-source-name {
    font-size: 0.6rem;
    font-weight: 500;
    opacity: 0.85;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px;
}

.page-number .page-source-number {
    font-size: 0.65rem;
    font-weight: 600;
    opacity: 0.95;
}

/* New Document Start Badge */
.page-item.new-document-start {
    position: relative;
}

.page-item.new-document-start::before {
    content: '📄 Yeni Belge';
    position: absolute;
    top: -0.75rem;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 700;
    z-index: 10;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.4);
    white-space: nowrap;
    letter-spacing: 0.3px;
}

/* Color variations for different documents - Applied to ALL pages of each document */
.page-item[data-doc-index="1"] .page-number {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

.page-item[data-doc-index="2"] .page-number {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.page-item[data-doc-index="3"] .page-number {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.page-item[data-doc-index="4"] .page-number {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.page-item[data-doc-index="5"] .page-number {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

.page-item[data-doc-index="6"] .page-number {
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
}

.page-item[data-doc-index="7"] .page-number {
    background: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
}

.page-item[data-doc-index="8"] .page-number {
    background: linear-gradient(135deg, #14b8a6 0%, #0d9488 100%);
}

/* Smooth transitions for all page numbers */
.page-item[data-doc-index] .page-number {
    transition: all 0.3s ease;
}

/* Preview Overlay */
.page-preview-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 30%;
    background: linear-gradient(to top, rgba(80, 80, 80, 0.75), rgba(80, 80, 80, 0.2));
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(100%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border-radius: 0 0 4px 4px;
    z-index: 3;
}

.page-preview-overlay i {
    font-size: 1.5rem;
    color: white;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
    transition: transform 0.3s ease;
}

.page-canvas-wrapper:hover .page-preview-overlay {
    opacity: 1;
    transform: translateY(0);
}

.page-preview-overlay:hover i {
    transform: scale(1.15);
}

.page-item.deleted .page-preview-overlay {
    display: none;
}

.page-checkbox {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    width: 20px;
    height: 20px;
    cursor: pointer;
    z-index: 100;
    pointer-events: auto;
}

.page-checkbox input[type="checkbox"] {
    width: 100%;
    height: 100%;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.page-checkbox input[type="checkbox"]:checked {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.page-checkbox input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.page-checkbox input[type="checkbox"]:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Drag and Drop Styles */
.page-item.dragging {
    opacity: 0.5;
    transform: scale(0.95);
    cursor: grabbing;
}

.page-item.drag-over {
    border: 3px dashed var(--accent-primary) !important;
    background: rgba(99, 102, 241, 0.25) !important;
    transform: scale(1.05);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3),
        0 0 20px rgba(99, 102, 241, 0.5),
        inset 0 0 20px rgba(99, 102, 241, 0.2);
    animation: dropTargetPulse 1s ease-in-out infinite;
}

@keyframes dropTargetPulse {

    0%,
    100% {
        box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.3),
            0 0 20px rgba(99, 102, 241, 0.5),
            inset 0 0 20px rgba(99, 102, 241, 0.2);
    }

    50% {
        box-shadow: 0 0 0 6px rgba(99, 102, 241, 0.5),
            0 0 30px rgba(99, 102, 241, 0.7),
            inset 0 0 30px rgba(99, 102, 241, 0.3);
    }
}

.page-item[draggable="true"] {
    cursor: grab;
}

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



/* ==================== */
/* Merge Section */
/* ==================== */
.merge-section {
    padding: 2rem 0;
}

.merge-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.merge-container h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.merge-list {
    margin-bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.merge-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-fast);
}

.merge-item:hover {
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.merge-item-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.merge-item-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.merge-item-details h4 {
    margin-bottom: 0.25rem;
}

.merge-item-details p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.merge-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* ==================== */
/* Loading Overlay */
/* ==================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 9999;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-overlay p {
    margin-top: 1rem;
    color: white;
    font-size: 1.1rem;
}

/* ==================== */
/* Toast Notifications */
/* ==================== */
.toast-container {
    position: fixed;
    top: 100px;
    right: 2rem;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 300px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast i {
    font-size: 1.5rem;
}

.toast.success i {
    color: var(--success);
}

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

.toast.warning i {
    color: var(--warning);
}

/* ==================== */
/* Confirmation Modal */
/* ==================== */
.confirm-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: none;
    align-items: center;
    justify-content: center;
}

.confirm-modal.active {
    display: flex;
}

.confirm-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.confirm-dialog {
    position: relative;
    z-index: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 450px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.confirm-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.confirm-header i {
    font-size: 1.5rem;
    color: var(--warning);
}

.confirm-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.confirm-body {
    padding: 1.5rem;
}

.confirm-body p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

.confirm-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* ==================== */
/* Compress Modal */
/* ==================== */
.compress-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: none;
    align-items: center;
    justify-content: center;
}

.compress-modal.active {
    display: flex;
}

.compress-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.compress-dialog {
    position: relative;
    z-index: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideDown 0.3s ease;
}

.compress-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.compress-header i {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.compress-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.compress-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.compress-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.compress-option:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.compress-option.selected {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.option-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.option-content h4 {
    margin: 0 0 0.25rem 0;
    font-size: 1rem;
    color: var(--text-primary);
}

.option-content p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.option-check {
    margin-left: auto;
    font-size: 1.25rem;
    color: var(--success);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.compress-option.selected .option-check {
    opacity: 1;
}

.compress-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* ==================== */
/* Preview Modal */
/* ==================== */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10001;
    display: none;
    align-items: center;
    justify-content: center;
}

.preview-modal.active {
    display: flex;
}

.preview-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1;
}

.preview-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: row;
    width: 100%;
    max-width: 95vw;
    max-height: 95vh;
    z-index: 10;
    gap: 1rem;
    pointer-events: none;
}

.preview-content>* {
    pointer-events: auto;
}

.preview-canvas-container {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 80vw;
    max-height: 85vh;
    position: relative;
}

.preview-canvas-container canvas {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    border-radius: 8px;
    animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.preview-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.preview-close:hover {
    background: var(--danger);
    transform: rotate(90deg);
}

.preview-nav {
    position: relative;
    width: 56px;
    height: 56px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    font-size: 1.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    flex-shrink: 0;
}

.preview-nav:hover {
    background: var(--accent-primary);
    transform: scale(1.1);
}

.preview-prev {
    order: 1;
}

.preview-canvas-container {
    order: 2;
}

.preview-next {
    order: 3;
}

.preview-nav:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.preview-nav:disabled:hover {
    background: rgba(0, 0, 0, 0.7);
    transform: scale(1);
}

.preview-info {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
}

/* Preview Navigation */
.preview-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.preview-nav:hover:not(:disabled) {
    background: var(--accent-primary);
    transform: translateY(-50%) scale(1.1);
}

.preview-nav:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.preview-prev {
    left: 2rem;
}

.preview-next {
    right: 2rem;
}

/* Preview Info */
.preview-info {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    z-index: 2;
}

/* Crop Overlay */
.crop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: 15;
    cursor: crosshair;
}

.crop-overlay.hidden {
    display: none;
}

.crop-box {
    position: absolute;
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid white;
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.7);
    cursor: move;
    z-index: 16;
}

.handle {
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border: 2px solid white;
    position: absolute;
    border-radius: 50%;
}

.handle.nw {
    top: -6px;
    left: -6px;
    cursor: nw-resize;
}

.handle.ne {
    top: -6px;
    right: -6px;
    cursor: ne-resize;
}

.handle.sw {
    bottom: -6px;
    left: -6px;
    cursor: sw-resize;
}

.handle.se {
    bottom: -6px;
    right: -6px;
    cursor: se-resize;
}

/* Crop Controls */
.preview-crop-controls {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 0.5rem;
    z-index: 2;
}

.preview-tool-btn {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-tool-btn:hover {
    background: var(--accent-primary);
    transform: scale(1.1);
}

.preview-tool-btn.active {
    background: var(--accent-primary);
}

.preview-crop-actions {
    position: absolute;
    top: 1rem;
    left: 4.5rem;
    display: flex;
    gap: 0.5rem;
    z-index: 17;
}

.preview-crop-actions button {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

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

.preview-crop-actions .btn-success:hover {
    background: #16a34a;
    transform: scale(1.1);
}

.preview-crop-actions .btn-secondary {
    background: var(--danger);
    color: white;
}

.preview-crop-actions .btn-secondary:hover {
    background: #dc2626;
    transform: scale(1.1);
}

/* ==================== */
/* Responsive Design */
/* ==================== */

/* Tablet View (1024px and below) */
@media (max-width: 1024px) {
    .editor-layout {
        grid-template-columns: 1fr;
    }

    .tools-sidebar {
        position: relative;
        top: 0;
    }

    .pages-container {
        grid-template-columns: repeat(4, 1fr);
    }

    .pages-info-bar {
        min-width: auto;
        flex-wrap: wrap;
    }

    .info-item {
        font-size: 0.85rem;
        padding: 0.4rem 0.75rem;
    }
}

/* Mobile View (768px and below) */
@media (max-width: 768px) {

    /* Container */
    .container {
        padding: 0 1rem;
    }

    /* Header */
    .header-content {
        flex-wrap: wrap;
        padding: 0.5rem 0;
    }

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

    .logo span {
        font-size: 0.9rem;
    }

    .logo i {
        font-size: 1.5rem;
    }

    /* Editor Toolbar - Hide on mobile, show in dropdown */
    .editor-toolbar {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        padding: 0.75rem;
        flex-wrap: wrap;
        max-width: 100%;
        z-index: 999;
        box-shadow: var(--shadow-md);
        display: none;
        /* Hidden by default on mobile */
    }

    .editor-toolbar.mobile-visible {
        display: flex;
    }

    .toolbar-btn {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }

    .toolbar-separator {
        display: none;
        /* Hide separators on mobile */
    }

    /* Mobile Menu Toggle Button */
    .mobile-menu-toggle {
        display: flex !important;
        width: 40px;
        height: 40px;
        border: none;
        background: var(--bg-tertiary);
        color: var(--text-primary);
        border-radius: 8px;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all var(--transition-fast);
    }

    .mobile-menu-toggle:hover {
        background: var(--accent-primary);
        color: white;
    }

    /* Hide mobile menu toggle on desktop */
    @media (min-width: 769px) {
        .mobile-menu-toggle {
            display: none !important;
        }
    }

    /* Upload Section */
    .upload-card {
        padding: 2rem 1.5rem;
        border-radius: 16px;
    }

    .upload-card h1 {
        font-size: 1.5rem;
    }

    .upload-card p {
        font-size: 0.95rem;
    }

    .upload-icon {
        width: 100px;
        height: 100px;
        font-size: 3rem;
        margin-bottom: 1.5rem;
    }

    .upload-actions {
        flex-direction: column;
        width: 100%;
    }

    .upload-actions .btn-primary {
        width: 100%;
    }

    /* Empty State */
    .empty-state {
        padding: 1.5rem 1rem 3rem 1rem;
    }

    .empty-icon {
        font-size: 4rem;
    }

    .empty-state h2 {
        font-size: 1.5rem;
    }

    .empty-description {
        font-size: 0.9rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .feature-item {
        padding: 0.75rem 0.5rem;
    }

    .feature-item i {
        font-size: 1.25rem;
    }

    .feature-item span {
        font-size: 0.75rem;
    }

    .empty-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn-large {
        width: 100%;
    }

    /* Pages Info Bar */
    .pages-info-bar {
        min-width: auto;
        flex-wrap: wrap;
        padding: 0.5rem 0.75rem;
        gap: 0.5rem;
        margin: 0.5rem 0 1rem 0;
    }

    .info-item {
        font-size: 0.75rem;
        padding: 0.35rem 0.6rem;
        gap: 0.5rem;
    }

    .info-item i {
        font-size: 1rem;
        width: 18px;
    }

    .info-item span {
        font-size: 0.8rem;
    }

    .info-item.documents-section {
        width: 100%;
        order: -1;
    }

    .document-tab {
        font-size: 0.8rem;
        padding: 0.35rem 0.5rem;
        max-width: 150px;
    }

    .add-doc-btn {
        width: 26px;
        height: 26px;
    }

    /* Pages Container */
    .pages-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
        padding: 1rem 0.5rem;
    }

    .page-item {
        padding: 0.35rem;
    }

    .page-number {
        font-size: 0.6rem;
        padding: 0.1rem 0.35rem;
    }

    .page-number .page-source-doc {
        font-size: 0.55rem;
    }

    .page-number .page-source-name {
        font-size: 0.5rem;
        max-width: 100px;
    }

    .page-number .page-source-number {
        font-size: 0.55rem;
    }

    .page-checkbox {
        width: 18px;
        height: 18px;
    }

    .page-item.new-document-start::before {
        font-size: 0.6rem;
        padding: 0.2rem 0.5rem;
        top: -0.6rem;
    }

    /* Collapsed Pages View */
    .pages-container.collapsed {
        min-height: 250px;
        padding: 1.5rem;
    }

    .pages-container.collapsed .page-item {
        width: 160px;
    }

    /* Buttons */
    .btn-primary,
    .btn-secondary,
    .btn-success,
    .btn-danger {
        padding: 0.65rem 1.25rem;
        font-size: 0.9rem;
        min-height: 44px;
        /* Touch-friendly */
    }

    .btn-icon {
        width: 40px;
        height: 40px;
        min-height: 40px;
    }

    /* Toast Notifications */
    .toast-container {
        right: 0.5rem;
        left: 0.5rem;
        top: 70px;
    }

    .toast {
        min-width: auto;
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }

    .toast i {
        font-size: 1.25rem;
    }

    /* Modals */
    .confirm-dialog,
    .compress-dialog {
        width: 95%;
        max-width: 95%;
    }

    .confirm-header,
    .compress-header {
        padding: 1rem;
    }

    .confirm-header h3,
    .compress-header h3 {
        font-size: 1.1rem;
    }

    .confirm-body,
    .compress-body {
        padding: 1rem;
    }

    .confirm-footer,
    .compress-footer {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
    }

    .confirm-footer button,
    .compress-footer button {
        flex: 1;
        min-width: 120px;
    }

    .compress-option {
        padding: 0.75rem;
    }

    .option-icon {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    .option-content h4 {
        font-size: 0.9rem;
    }

    .option-content p {
        font-size: 0.8rem;
    }

    /* Preview Modal */
    .preview-content {
        max-width: 100vw;
        max-height: 100vh;
    }

    .preview-canvas-container {
        max-width: 90vw;
        max-height: 80vh;
    }

    .preview-canvas-container canvas {
        max-height: 80vh;
    }

    .preview-close {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
        top: 0.5rem;
        right: 0.5rem;
    }

    .preview-nav {
        width: 40px;
        height: 40px;
        font-size: 1.25rem;
    }

    .preview-prev {
        left: 0.5rem;
    }

    .preview-next {
        right: 0.5rem;
    }

    .preview-info {
        bottom: 1rem;
        font-size: 0.85rem;
        padding: 0.5rem 1rem;
    }

    .preview-crop-controls,
    .preview-crop-actions {
        top: 0.5rem;
        left: 0.5rem;
    }

    .preview-crop-actions {
        left: 3.5rem;
    }

    .preview-tool-btn,
    .preview-crop-actions button {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }

    /* Crop Box */
    .crop-box {
        width: 150px;
        height: 150px;
    }

    .handle {
        width: 16px;
        height: 16px;
    }

    .handle.nw {
        top: -8px;
        left: -8px;
    }

    .handle.ne {
        top: -8px;
        right: -8px;
    }

    .handle.sw {
        bottom: -8px;
        left: -8px;
    }

    .handle.se {
        bottom: -8px;
        right: -8px;
    }
}

/* Small Mobile View (480px and below) */
@media (max-width: 480px) {
    .logo span {
        display: none;
    }

    .pages-container {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pages-info-bar {
        font-size: 0.7rem;
    }

    .info-item {
        padding: 0.3rem 0.5rem;
    }

    .document-tab {
        font-size: 0.75rem;
        max-width: 120px;
    }

    .editor-toolbar {
        gap: 0.35rem;
        padding: 0.5rem;
    }

    .toolbar-btn {
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }

    .page-item.new-document-start::before {
        font-size: 0.55rem;
        padding: 0.15rem 0.4rem;
    }
}

/* Landscape Mobile Optimization */
@media (max-width: 768px) and (orientation: landscape) {
    .pages-container {
        grid-template-columns: repeat(3, 1fr);
    }

    .preview-canvas-container {
        max-height: 85vh;
    }

    .upload-icon {
        width: 80px;
        height: 80px;
        font-size: 2.5rem;
    }

    .empty-icon {
        font-size: 3rem;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {

    /* Increase touch targets */
    .toolbar-btn,
    .btn-icon,
    .page-checkbox,
    .document-tab,
    .add-doc-btn {
        min-width: 44px;
        min-height: 44px;
    }

    /* Remove hover effects on touch devices */
    .page-item:hover {
        border-color: var(--border-color);
        background: transparent;
    }

    .page-item.selected {
        border-color: var(--accent-primary);
        background: var(--bg-tertiary);
    }

    /* Show preview overlay by default on touch */
    .page-preview-overlay {
        opacity: 0.8;
        transform: translateY(0);
    }

    .page-canvas-wrapper:active .page-preview-overlay {
        opacity: 1;
    }
}

/* ==================== */
/* Loading Overlay & Progress Bar */
/* ==================== */
.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: 2000;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1rem;
}

.loading-overlay p {
    color: white;
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.progress-bar-container {
    width: 300px;
    height: 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background: var(--accent-primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.9rem !important;
    opacity: 0.8;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}