/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
    /* Colors */
    --color-primary: #00ff88;
    --color-primary-light: #5affb4;
    --color-primary-dark: #00cc6a;
    --color-bg-dark: #050505;
    --color-bg-darker: #000000;
    --color-bg-card: rgba(20, 20, 20, 0.6);
    --color-bg-input: rgba(255, 255, 255, 0.03);
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-border: rgba(0, 255, 136, 0.2);
    --color-navbar: rgba(0, 0, 0, 0.3);
    --color-error: #ff4d4d;
    --color-success: #00ff88;

    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    --spacing-xxl: 40px;

    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-xl: 20px;
    --radius-xxl: 30px;
    --radius-full: 50px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s ease;

    /* Shadows */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px 0 rgba(0, 0, 0, 0.8);
    --shadow-primary: 0 0 20px rgba(0, 255, 136, 0.4);

    /* Glassmorphism */
    --glass-bg: rgba(10, 10, 10, 0.4);
    --glass-border: 1px solid rgba(0, 255, 136, 0.1);
    --glass-blur: blur(12px);
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {

    *:not(.particle),
    *:not(.particle)::before,
    *:not(.particle)::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

html {
    background-color: #050505;
}

body {
    background-color: transparent;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--color-text-primary);
    position: relative;
    overflow-x: hidden;
}

#particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    background: rgba(0, 255, 136, 0.8);
    border-radius: 50%;
    opacity: 0;
    pointer-events: none;
    box-shadow: 0 0 6px rgba(0, 255, 136, 0.6), 0 0 12px rgba(0, 255, 136, 0.4);
}

.gradient-sphere {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 255, 136, 0.447) 0%, transparent 70%);
    filter: blur(80px);
    z-index: -2;
    animation: float 20s infinite ease-in-out alternate;
    pointer-events: none;
    transition: transform 0.1s ease-out;
}

.sphere-1 {
    top: -100px;
    left: -100px;
}

.sphere-2 {
    background: radial-gradient(circle, rgba(0, 255, 136, 0.1) 0%, transparent 70%);
    bottom: -100px;
    right: -100px;
    animation-delay: -10s;
    animation-duration: 25s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30vw, 20vh) scale(1.2);
    }
    66% {
        transform: translate(60vw, 10vh) scale(0.8);
    }
    100% {
        transform: translate(calc(80vw - 300px), calc(80vh - 300px)) scale(1.1);
    }
}

/* ===================================
   Navbar Styles
   =================================== */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: rgb(0, 255, 179);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.navbar-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.navbar-brand span {
    margin-left: 10px;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.navbar-menu li a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    transition: color var(--transition-normal);
    padding: var(--spacing-sm);
}

.navbar-menu li a:hover,
.navbar-menu li a:focus {
    color: var(--color-primary);
    outline: none;
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    min-width: 44px;
    min-height: 44px;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }

    .navbar-menu {
        position: fixed;
        top: 60px;
        right: -100%;
        flex-direction: column;
        background-color: #0f3460;
        width: 80%;
        max-width: 300px;
        height: calc(100vh - 60px);
        padding: 2rem;
        transition: right var(--transition-normal);
        gap: 2rem;
    }

    .navbar-menu.active {
        right: 0;
    }

    .navbar-toggle {
        display: block;
    }
}

/* ===================================
   Main Content
   =================================== */
.main-content {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
    padding: var(--spacing-lg);
}

.container {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--glass-border);
    border-radius: var(--radius-xxl);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 800px;
    padding: var(--spacing-xxl);
    text-align: center;
}

h1 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    font-weight: 600;
}

p.subtitle {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1rem;
}

/* ===================================
   Upload Container
   =================================== */
.upload-container {
    position: relative;
    background: rgba(0, 255, 136, 0.02);
    border: 2px dashed rgba(0, 255, 136, 0.3);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xxl) var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    will-change: transform, background-color;
}

.upload-container:hover,
.upload-container:focus-within {
    background: rgba(0, 255, 136, 0.05);
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.15);
}

.upload-container.drag-over {
    border-color: var(--color-success);
    background-color: rgba(46, 204, 113, 0.1);
    transform: scale(1.02);
}

.upload-container input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 50px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    transition: transform 0.5s ease;
}

.upload-container:hover .upload-icon {
    transform: scale(1.1) translateY(-5px);
}

.upload-text {
    color: var(--color-text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.upload-hint {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* ===================================
   Selected Files
   =================================== */
.selected-files,
.selected-file {
    margin: var(--spacing-lg) 0;
    text-align: left;
    max-height: 200px;
    overflow-y: auto;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    backdrop-filter: blur(5px);
}

.selected-files.hidden,
.selected-file.hidden {
    display: none;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    animation: slideIn 0.4s ease-out forwards;
    cursor: grab;
    position: relative;
}

.file-item:active {
    cursor: grabbing;
}

.file-item.dragging {
    opacity: 0.5;
    background: rgba(0, 255, 136, 0.1);
    border: 1px dashed var(--color-primary);
}

.file-item.drag-over-top {
    border-top: 2px solid var(--color-primary);
    margin-top: 5px;
}

.file-item.drag-over-bottom {
    border-bottom: 2px solid var(--color-primary);
    margin-bottom: 5px;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background-color: rgba(0, 180, 171, 0.1);
    transform: translateX(5px);
}

.drag-handle {
    color: var(--color-text-secondary);
    margin-right: var(--spacing-sm);
    cursor: grab;
    font-size: 1.2rem;
    line-height: 1;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

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

.file-order-controls {
    display: flex;
    flex-direction: column;
    margin-right: var(--spacing-md);
}

.order-btn {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 0.7rem;
    padding: 2px;
    line-height: 1;
    transition: color var(--transition-fast);
}

.order-btn:hover:not(:disabled) {
    color: var(--color-primary);
}

.order-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.file-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: 0.9rem;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.remove-file {
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    font-size: 0.85rem;
    transition: color var(--transition-normal);
    padding: var(--spacing-sm);
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-file:hover,
.remove-file:focus {
    color: var(--color-primary-light);
    outline: none;
}

/* ===================================
   Submit Button
   =================================== */
.submit-btn {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #000;
    border: 1px solid rgba(0, 255, 136, 0.4);
    border-radius: var(--radius-full);
    padding: 14px 35px;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all var(--transition-slow);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
    position: relative;
    overflow: hidden;
    min-height: 44px;
    backdrop-filter: blur(5px);
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.6);
}

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

.submit-btn:disabled {
    background: #245a4b;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ===================================
   Error Message
   =================================== */
.error-message {
    color: var(--color-error);
    font-size: 0.9rem;
    margin-top: var(--spacing-lg);
    min-height: 1.5em;
    transition: opacity var(--transition-normal);
}

/* ===================================
   Tabs Styling
   =================================== */
.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.tab {
    padding: 12px 24px;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    margin: 0 var(--spacing-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
    min-height: 44px;
    display: flex;
    align-items: center;
}

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background: rgba(0, 255, 136, 0.05);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.tab:hover:not(.active),
.tab:focus:not(.active) {
    color: var(--color-primary-light);
    border-bottom-color: rgba(0, 255, 136, 0.3);
    background: rgba(0, 255, 136, 0.02);
    outline: none;
}

.tab-content {
    display: none;
    opacity: 0;
    transform: translateX(20px);
}

.tab-content.active {
    display: block;
    animation: slideInFade 0.4s forwards;
}

/* ===================================
   Form Styles
   =================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-text-primary);
}

.form-control {
    width: 100%;
    padding: 12px var(--spacing-md);
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: rgba(0, 0, 0, 0.2);
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
    backdrop-filter: blur(5px);
}

.form-control:focus {
    border-color: var(--color-primary);
    background: rgba(0, 255, 136, 0.05);
    outline: none;
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.2);
}

.form-instructions {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    line-height: 1.6;
}

.pdf-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    text-align: left;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.pdf-info.hidden {
    display: none;
}

/* ===================================
   Radio Options
   =================================== */
.radio-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.radio-option {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.radio-option:hover {
    background-color: var(--color-bg-input);
}

.radio-option.active {
    border-color: var(--color-primary);
    background-color: rgba(0, 180, 171, 0.1);
}

.radio-option input[type="radio"] {
    margin-right: var(--spacing-sm);
    margin-top: 3px;
}

.radio-option-content {
    flex: 1;
}

.radio-option-title {
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.radio-option-description {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.extraction-options {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    text-align: left;
    backdrop-filter: blur(5px);
}

.extraction-options.hidden {
    display: none;
}

.extraction-options h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

/* ===================================
   Loading Overlay
   =================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity var(--transition-normal);
}

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

.loader {
    border: 5px solid rgba(39, 39, 68, 0.5);
    border-radius: 50%;
    border-top: 5px solid var(--color-primary);
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 0 15px rgba(0, 180, 171, 0.5);
}

.loading-overlay p {
    color: var(--color-text-primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.progress-container {
    width: 200px;
    height: 6px;
    background-color: var(--color-bg-input);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

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

.progress-text {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* ===================================
   Animations
   =================================== */
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-20px);
        opacity: 0;
    }

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

@keyframes slideInFade {
    from {
        transform: translateX(20px);
        opacity: 0;
    }

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

@keyframes zoomIn {
    from {
        transform: scale(0.95);
        opacity: 0;
    }

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

/* Animation utility classes */
.fade-in {
    animation: fadeIn 0.8s ease-in-out;
}

.slide-in {
    animation: slideIn 0.5s ease-out forwards;
}

.zoom-in {
    animation: zoomIn 0.4s ease forwards;
}

/* ===================================
   Footer Styles
   =================================== */
.footer {
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    color: var(--color-text-secondary);
}

.copyright {
    font-size: 0.9rem;
    margin: 0;
}

/* ===================================
   Utility Classes
   =================================== */
.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===================================
   Page Preview Section
   =================================== */
.page-preview-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    text-align: left;
    backdrop-filter: blur(5px);
}

.page-preview-section.hidden {
    display: none;
}

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

.page-preview-section h3 {
    margin: 0;
    color: var(--color-text-primary);
}

.preview-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.preview-action-btn {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.preview-hint {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.page-thumbnails {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-md);
    max-height: 350px;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.page-thumbnail {
    position: relative;
    cursor: pointer;
    border: 2px solid rgba(0, 255, 136, 0.2);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-fast);
    background-color: rgba(255, 255, 255, 0.9);
    aspect-ratio: 8.5 / 11;
}

.page-thumbnail:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.4);
}

.page-thumbnail.selected {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 180, 171, 0.3);
}

.page-thumbnail.dragging {
    opacity: 0.5;
    border-color: var(--color-primary);
    transform: scale(0.95);
}

.page-thumbnail.drag-over-left {
    border-left: 4px solid var(--color-primary);
    transform: translateX(5px);
}

.page-thumbnail.drag-over-right {
    border-right: 4px solid var(--color-primary);
    transform: translateX(-5px);
}

.page-thumbnail canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.page-thumbnail-number {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: 0.75rem;
    padding: 2px 5px;
    text-align: center;
}

.page-thumbnail-checkbox {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 22px;
    height: 22px;
    background-color: rgba(0, 0, 0, 0.5);
    border: 2px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: bold;
    opacity: 0;
    transition: all var(--transition-fast);
}

.page-thumbnail:hover .page-thumbnail-checkbox {
    opacity: 0.7;
}

.page-thumbnail.selected .page-thumbnail-checkbox {
    opacity: 1;
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.page-thumbnail-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ===================================
   Preview Modal
   =================================== */
.preview-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.2s ease;
}

.preview-modal.hidden {
    display: none;
}

.preview-modal-content {
    background: rgba(20, 20, 40, 0.85);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

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

.preview-page-info {
    color: var(--color-text-primary);
    font-weight: 500;
}

.preview-close-btn {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 1.8rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    line-height: 1;
    transition: color var(--transition-fast);
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-close-btn:hover {
    color: var(--color-primary);
}

.preview-modal-body {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    overflow: auto;
    position: relative;
    min-height: 400px;
}

.preview-modal-body canvas {
    max-width: 100%;
    max-height: 70vh;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
    background-color: white;
}

.preview-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background-color: rgba(0, 180, 171, 0.8);
    border: none;
    color: white;
    font-size: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

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

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

.preview-nav-btn.prev {
    left: var(--spacing-md);
}

.preview-nav-btn.next {
    right: var(--spacing-md);
}

.preview-modal-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.preview-zoom-btn {
    background-color: var(--color-bg-input);
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
    font-size: 1.2rem;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.zoom-level {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    min-width: 50px;
    text-align: center;
}

/* Mobile adjustments for preview */
@media (max-width: 768px) {
    .page-thumbnails {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        max-height: 250px;
    }

    .preview-modal-content {
        max-width: 95vw;
        max-height: 95vh;
    }

    .preview-nav-btn {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .preview-modal-body canvas {
        max-height: 60vh;
    }
}