/* Reset and Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color Palette - Cool Blues and Grays */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;
    
    --accent-400: #4f46e5;
    --accent-500: #6366f1;
    --accent-600: #7c3aed;
    
    --success-400: #22c55e;
    --success-500: #16a34a;
    --error-400: #ef4444;
    --error-500: #dc2626;
    --warning-400: #f59e0b;
    --warning-500: #d97706;
    
    /* Semantic Colors */
    --bg-primary: var(--secondary-50);
    --bg-secondary: #ffffff;
    --bg-tertiary: var(--secondary-100);
    --text-primary: var(--secondary-900);
    --text-secondary: var(--secondary-700);
    --text-muted: var(--secondary-500);
    --border-color: var(--secondary-200);
    --border-hover: var(--secondary-300);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', monospace;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-normal: 250ms ease-out;
    --transition-slow: 350ms ease-out;
    
    /* Z-index */
    --z-modal: 1000;
    --z-overlay: 999;
    --z-dropdown: 500;
    --z-header: 100;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #ffffff;
        --bg-secondary: #ffffff;
        --bg-tertiary: #f5f5f5;
        --text-primary: #000000;
        --text-secondary: #000000;
        --text-muted: #333333;
        --border-color: #000000;
        --border-hover: #000000;
    }
}

[data-high-contrast="true"] {
    --bg-primary: #ffffff;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f5f5f5;
    --text-primary: #000000;
    --text-secondary: #000000;
    --text-muted: #333333;
    --border-color: #000000;
    --border-hover: #000000;
}

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

[data-reduced-motion="true"] *,
[data-reduced-motion="true"] *::before,
[data-reduced-motion="true"] *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
}

/* Base Typography */
html {
    font-size: 16px;
    line-height: 1.5;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-600);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius);
    z-index: 1001;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-6);
    }
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--primary-600);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo svg {
    color: var(--primary-600);
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--space-2);
    background: var(--bg-tertiary);
    padding: var(--space-1);
    border-radius: var(--radius-lg);
}

.nav-button {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.nav-button.active {
    background: var(--bg-secondary);
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.nav-button:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
}

.nav-icon {
    font-size: 1rem;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    .nav {
        width: 100%;
        justify-content: center;
    }
    
    .nav-button {
        flex: 1;
        justify-content: center;
        font-size: 0.75rem;
        padding: var(--space-2) var(--space-3);
    }
}

/* Main Content */
.main {
    flex: 1;
    padding: var(--space-8) 0;
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn var(--transition-normal) ease-out;
}

.tab-content.active {
    display: block;
}

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

/* Upload Area */
.upload-section {
    margin-bottom: var(--space-8);
}

.upload-area, .batch-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-16);
    text-align: center;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.upload-area::before, .batch-upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left var(--transition-slow);
}

.upload-area:hover::before, .batch-upload-area:hover::before {
    left: 100%;
}

.upload-area:hover, .upload-area:focus,
.batch-upload-area:hover, .batch-upload-area:focus {
    border-color: var(--primary-400);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area.dragover, .batch-upload-area.dragover {
    border-color: var(--primary-600);
    background: var(--primary-100);
    transform: scale(1.02);
}

.upload-content {
    position: relative;
    z-index: 1;
}

.upload-icon {
    color: var(--primary-400);
    margin-bottom: var(--space-4);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

.upload-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.upload-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.upload-specs {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.spec {
    font-size: 0.875rem;
    color: var(--text-muted);
    padding: var(--space-1) var(--space-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

#file-input, #batch-file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* Password Section */
.password-section {
    margin-bottom: var(--space-8);
    animation: slideDown var(--transition-normal) ease-out;
}

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

.password-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.password-card h3 {
    color: var(--warning-500);
    margin-bottom: var(--space-4);
    font-size: 1.25rem;
}

.password-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.password-input-group {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* File Info */
.file-info {
    margin-bottom: var(--space-8);
    animation: slideUp var(--transition-normal) ease-out;
}

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

.file-details {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow);
}

.file-icon {
    font-size: 2rem;
    color: var(--primary-500);
}

.file-meta {
    flex: 1;
}

.file-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.file-stats {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Preview Section */
.preview-section {
    margin-bottom: var(--space-8);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.preview-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.preview-controls {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Range Input */
.range-input {
    margin-bottom: var(--space-6);
    animation: slideDown var(--transition-normal) ease-out;
}

.range-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow);
}

.range-card h4 {
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.range-help {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--space-4);
}

.range-input-group {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

#page-range {
    flex: 1;
}

/* Page Grid */
.page-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.page-item {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.page-item:hover {
    border-color: var(--primary-400);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.page-item.selected {
    border-color: var(--primary-600);
    background: var(--primary-50);
    box-shadow: var(--shadow-lg);
}

.page-item.selected::before {
    content: '✓';
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--primary-600);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: bold;
}

.page-preview {
    width: 100%;
    height: 200px;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.page-preview canvas {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-sm);
}

.page-number {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Form Elements */
.input, .select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.input:hover, .select:hover {
    border-color: var(--border-hover);
}

.input:focus, .select:focus {
    outline: none;
    border-color: var(--primary-600);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input::placeholder {
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-fast);
}

.btn:hover::before {
    left: 100%;
}

.btn:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
}

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

.btn:disabled::before {
    display: none;
}

/* Button Variants */
.btn-primary {
    background: var(--primary-600);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
    font-weight: 600;
}

.btn-icon {
    padding: var(--space-3);
    width: auto;
    background: transparent;
    border: none;
    color: var(--text-muted);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Output Section */
.output-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
}

.output-header {
    margin-bottom: var(--space-6);
}

.output-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.output-options {
    display: grid;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

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

.option-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.output-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* Batch Processing */
.batch-section {
    max-width: 800px;
    margin: 0 auto;
}

.batch-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.batch-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.batch-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.batch-upload-area {
    padding: var(--space-12);
    margin-bottom: var(--space-8);
}

.batch-files {
    margin-bottom: var(--space-8);
}

.batch-files-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.batch-file-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.batch-file-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
}

.batch-file-icon {
    font-size: 1.5rem;
    color: var(--primary-500);
}

.batch-file-meta {
    flex: 1;
}

.batch-file-name {
    font-weight: 500;
    margin-bottom: var(--space-1);
}

.batch-file-size {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.batch-options {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-align: center;
}

.batch-options h3 {
    margin-bottom: var(--space-6);
    font-size: 1.25rem;
}

/* Settings */
.settings-section {
    max-width: 600px;
    margin: 0 auto;
}

.settings-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-8);
    text-align: center;
}

.settings-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
}

.settings-group h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.setting-item {
    margin-bottom: var(--space-4);
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-label {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    font-weight: 500;
}

.setting-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-600);
}

.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius);
}

.shortcut-key {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--bg-secondary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.shortcut-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.settings-actions {
    text-align: center;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    background: var(--bg-secondary);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 400px;
    margin: var(--space-4);
    box-shadow: var(--shadow-xl);
    animation: slideUp var(--transition-normal) ease-out;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto var(--space-4);
    border: 3px solid var(--primary-200);
    border-top: 3px solid var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.loading-text {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-3);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-lg);
    transition: width var(--transition-normal);
    width: 0%;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    animation: modalSlide var(--transition-normal) ease-out;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6) var(--space-6) var(--space-4);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: var(--space-2);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.modal-actions {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    margin-top: var(--space-6);
}

.download-options {
    margin-top: var(--space-6);
}

.download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
}

.download-item:last-child {
    margin-bottom: 0;
}

.download-info {
    flex: 1;
}

.download-name {
    font-weight: 500;
    margin-bottom: var(--space-1);
}

.download-size {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-6) 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .upload-area, .batch-upload-area {
        padding: var(--space-8);
    }
    
    .upload-title {
        font-size: 1.25rem;
    }
    
    .upload-specs {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .file-details {
        flex-direction: column;
        text-align: center;
        gap: var(--space-3);
    }
    
    .preview-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .preview-controls {
        justify-content: center;
    }
    
    .page-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: var(--space-3);
    }
    
    .page-preview {
        height: 160px;
    }
    
    .range-input-group {
        flex-direction: column;
    }
    
    .password-input-group {
        flex-direction: column;
    }
    
    .output-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--space-4);
    }
    
    .batch-file-item {
        flex-direction: column;
        text-align: center;
        gap: var(--space-3);
    }
}

@media (max-width: 480px) {
    .nav {
        flex-direction: column;
    }
    
    .nav-button {
        justify-content: flex-start;
    }
    
    .upload-area, .batch-upload-area {
        padding: var(--space-6);
    }
    
    .loading-content {
        padding: var(--space-6);
    }
    
    .page-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    .page-preview {
        height: 140px;
    }
}

/* Focus Styles for Better Accessibility */
*:focus {
    outline: 2px solid var(--primary-600);
    outline-offset: 2px;
}

.page-item:focus {
    outline: 3px solid var(--primary-600);
    outline-offset: 2px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-400);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-500);
}

/* Selection Colors */
::selection {
    background: var(--primary-200);
    color: var(--primary-900);
}

::-moz-selection {
    background: var(--primary-200);
    color: var(--primary-900);
}