/* DOCMATE - Smart Reading Platform Styles */

/* CSS Variables for Theme Management */
:root {
    /* Light Theme */
    --primary-bg: #FFFFFF;
    --secondary-bg: #F8FAFC;
    --accent-color: #1E293B;
    --accent-hover: #334155;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --hover-bg: #F3F4F6;
    --sidebar-bg: #F9FAFB;
    --card-bg: #FFFFFF;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
    --primary-bg: #0F172A;
    --secondary-bg: #1E293B;
    --accent-color: #3B82F6;
    --accent-hover: #2563EB;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --border-color: #334155;
    --hover-bg: #334155;
    --sidebar-bg: #1E293B;
    --card-bg: #1E293B;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    transition: all 0.3s ease;
    overflow-x: hidden;
}

.hidden {
    display: none !important;
}

/* Typography */
.main-title, .section-title, .document-title, .feature-title, .logo-text {
    font-family: 'Michroma', monospace;
    font-weight: 400;
    letter-spacing: 1px;
}

.main-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-title {
    font-size: 1.875rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Navigation Sidebar */
.nav-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 80px;
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 0;
    z-index: 30;
    transition: all 0.3s ease;
}

.nav-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0.75rem 0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-size: 1.25rem;
}

.nav-icon:hover {
    background-color: var(--hover-bg);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.nav-icon.active {
    background-color: var(--accent-color);
    color: white;
    box-shadow: var(--shadow-lg);
}

.nav-divider {
    width: 60%;
    height: 1px;
    background-color: var(--border-color);
    margin: 1rem 0;
}

/* Top Controls */
.top-controls {
    position: fixed;
    top: 0;
    left: 80px;
    right: 0;
    height: 70px;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    z-index: 25;
    transition: all 0.3s ease;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.logo-text {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.quiz-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 1rem;
}

.quiz-icon:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

.controls-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mini-select {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    min-width: 60px;
    cursor: pointer;
}

.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background-color: var(--hover-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.theme-toggle:hover {
    background-color: var(--accent-color);
    color: white;
}

/* Main Content */
.main-content {
    margin-left: 80px;
    margin-top: 70px;
    min-height: calc(100vh - 70px);
    padding: 2rem;
    transition: all 0.3s ease;
}

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

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

/* Home Section */
.home-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.welcome-header {
    margin-bottom: 3rem;
}

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 4rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 4rem;
    background-color: var(--card-bg);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--accent-color);
    background-color: var(--hover-bg);
    transform: translateY(-2px);
}

.upload-icon {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.upload-title {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.upload-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.upload-btn {
    font-size: 1.125rem;
    padding: 1rem 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Reading Section */
.reading-container {
    max-width: 900px;
    margin: 0 auto;
}

.document-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.back-btn {
    background: none;
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.back-btn:hover {
    background-color: var(--hover-bg);
}

.document-title {
    font-size: 1.5rem;
    flex: 1;
    text-align: center;
    margin: 0 2rem;
}

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

.document-viewer {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    margin-bottom: 2rem;
    min-height: 500px;
    box-shadow: var(--shadow);
}

.document-content {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
    text-align: justify;
}

.document-content h1,
.document-content h2,
.document-content h3 {
    font-family: 'Michroma', monospace;
    margin: 2rem 0 1rem 0;
    color: var(--text-primary);
}

.document-content p {
    margin-bottom: 1.5rem;
}

.document-content ul,
.document-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

/* Audio Controls */
.audio-controls {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.audio-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.headphone-icon {
    width: 48px;
    height: 48px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.25rem;
}

.headphone-icon:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

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

.audio-timeline {
    margin-top: 1rem;
}

.timeline-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.timeline-play-btn {
    width: 40px;
    height: 40px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.timeline-play-btn:hover {
    background-color: var(--accent-hover);
}

.timeline-bar {
    flex: 1;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    position: relative;
    cursor: pointer;
}

.timeline-progress {
    height: 100%;
    background-color: var(--accent-color);
    border-radius: 3px;
    width: 0%;
    transition: width 0.1s ease;
}

.timeline-handle {
    width: 16px;
    height: 16px;
    background-color: var(--accent-color);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0%;
    cursor: pointer;
    box-shadow: var(--shadow);
}

.timeline-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-width: 80px;
    text-align: right;
}

.document-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
}

.nav-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.nav-btn:disabled {
    background-color: var(--border-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.notes-actions,
.camera-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.add-note-btn {
    width: 40px;
    height: 40px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.add-note-btn:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

.count-badge,
.score-badge {
    background-color: var(--hover-bg);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
}

/* Search Container */
.search-container {
    margin-bottom: 2rem;
}

.search-box {
    display: flex;
    align-items: center;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    gap: 0.75rem;
}

.search-icon {
    color: var(--accent-color);
    font-size: 1.125rem;
}

.search-input {
    flex: 1;
    border: none;
    background: none;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

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

.clear-btn,
.search-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.clear-btn:hover,
.search-btn:hover {
    color: var(--accent-color);
    background-color: var(--hover-bg);
}

/* Grids and Lists */
.library-grid,
.notes-grid,
.audio-grid,
.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.book-card,
.note-card,
.audio-card,
.image-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.book-card:hover,
.note-card:hover,
.audio-card:hover,
.image-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.card-title {
    font-family: 'Michroma', monospace;
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.card-content {
    flex: 1;
    margin-bottom: 1rem;
}

.card-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.edit-btn {
    width: 32px;
    height: 32px;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.edit-btn:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    background-color: var(--hover-bg);
}

/* Empty States */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    grid-column: 1 / -1;
}

.empty-icon {
    font-size: 4rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-title {
    font-family: 'Michroma', monospace;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.empty-desc {
    color: var(--text-secondary);
    opacity: 0.8;
}

/* Camera Section */
.camera-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.camera-video,
.camera-canvas {
    max-width: 100%;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.camera-placeholder {
    padding: 4rem 2rem;
}

.camera-placeholder-icon {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.camera-placeholder-title {
    font-family: 'Michroma', monospace;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.camera-placeholder-desc {
    color: var(--text-secondary);
}

.camera-controls {
    margin-top: 1rem;
}

.capture-btn {
    width: 80px;
    height: 80px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.capture-btn:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

.captured-title {
    font-family: 'Michroma', monospace;
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Analysis Results */
.analysis-results {
    space-y: 2rem;
}

.analysis-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.analysis-summary {
    background-color: var(--hover-bg);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.analysis-points {
    list-style: none;
    padding: 0;
}

.analysis-points li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 1rem;
    padding: 1rem;
    background-color: var(--hover-bg);
    border-radius: 8px;
}

.analysis-points li::before {
    content: '•';
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-right: 1rem;
    flex-shrink: 0;
}

.source-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.source-link:hover {
    text-decoration: underline;
    color: var(--accent-hover);
}

/* Quiz Section */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-question {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.question-text {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.quiz-options {
    display: grid;
    gap: 1rem;
}

.quiz-option {
    background-color: var(--hover-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.quiz-option:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.quiz-option.selected {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.quiz-option.correct {
    background-color: #10B981;
    color: white;
    border-color: #10B981;
}

.quiz-option.incorrect {
    background-color: #EF4444;
    color: white;
    border-color: #EF4444;
}

/* Quick Note Panel */
.quick-note-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 500px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    z-index: 100;
    box-shadow: var(--shadow-lg);
    display: none;
}

.quick-note-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.quick-note-header h3 {
    font-family: 'Michroma', monospace;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.close-btn:hover {
    color: var(--accent-color);
    background-color: var(--hover-bg);
}

.quick-note-input {
    width: 100%;
    min-height: 120px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
}

.quick-note-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.quick-note-actions {
    display: flex;
    justify-content: flex-end;
}

/* Floating Action Buttons */
.floating-actions {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 50;
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.record-fab {
    background-color: white;
    color: #EF4444;
}

.record-fab:hover {
    background-color: #FEF2F2;
    transform: scale(1.1);
}

.record-fab.recording {
    background-color: #EF4444;
    color: white;
    animation: pulse 2s infinite;
}

.note-fab {
    background-color: var(--accent-color);
    color: white;
}

.note-fab:hover {
    background-color: var(--accent-hover);
    transform: scale(1.1);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

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

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.loading-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    max-width: 300px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Toast Container */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 300;
    pointer-events: none;
}

.toast {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    margin-bottom: 0.5rem;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 400px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid #10B981;
}

.toast.error {
    border-left: 4px solid #EF4444;
}

.toast.warning {
    border-left: 4px solid #F59E0B;
}

.toast.info {
    border-left: 4px solid var(--accent-color);
}

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

.toast.success .toast-icon {
    color: #10B981;
}

.toast.error .toast-icon {
    color: #EF4444;
}

.toast.warning .toast-icon {
    color: #F59E0B;
}

.toast.info .toast-icon {
    color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-sidebar {
        transform: translateX(-100%);
    }
    
    .nav-sidebar.open {
        transform: translateX(0);
    }
    
    .top-controls {
        left: 0;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .library-grid,
    .notes-grid,
    .audio-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .document-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .document-title {
        margin: 0;
    }
    
    .document-viewer {
        padding: 1.5rem;
    }
    
    .features-grid,
    .library-grid,
    .notes-grid,
    .audio-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .timeline-bar {
        order: -1;
    }
    
    .floating-actions {
        bottom: 1rem;
        right: 1rem;
    }
    
    .fab {
        width: 48px;
        height: 48px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .upload-zone {
        padding: 2rem 1rem;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .document-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-btn {
        width: 100%;
        justify-content: center;
    }
    
    .quick-note-panel {
        width: 95%;
        padding: 1.5rem;
    }
}

/* Print Styles */
@media print {
    .nav-sidebar,
    .top-controls,
    .floating-actions,
    .audio-controls,
    .document-navigation,
    .section-header {
        display: none !important;
    }
    
    .main-content {
        margin: 0 !important;
        padding: 1rem !important;
    }
    
    .document-viewer {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

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

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #FFFFFF;
        --text-secondary: #FFFFFF;
    }
}

/* Focus styles for accessibility */
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.nav-icon:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}