/* ========================================
   Illumine Lingao Reader Styles
   Supports EPUB and PDF with Dark Mode
   ======================================== */

/* CSS Variables for Theming */
:root {
    --bg-color: #fafafa;
    --content-bg: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #6c757d;
    --accent-color: #8b4513;
    --border-color: #e9ecef;
    --sidebar-bg: #f8f9fa;
    --hover-bg: #e9ecef;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 4px 20px rgba(0,0,0,0.12);
    --font-serif: 'Crimson Text', Georgia, serif;
    --font-sans: 'Inter', system-ui, sans-serif;
    --content-width: 720px;
    --sidebar-width: 320px;
    --pdf-bg: #525659;
}

/* Sepia Theme */
[data-theme="sepia"] {
    --bg-color: #f4ecd8;
    --content-bg: #fdf6e3;
    --text-color: #5b4636;
    --text-muted: #8b7355;
    --accent-color: #8b4513;
    --border-color: #e8dec5;
    --sidebar-bg: #f0e6d2;
    --hover-bg: #e8dec5;
    --pdf-bg: #d4c5a9;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --content-bg: #16213e;
    --text-color: #e8e8e8;
    --text-muted: #a0a0a0;
    --accent-color: #e94560;
    --border-color: #2d3748;
    --sidebar-bg: #1f2937;
    --hover-bg: #374151;
    --pdf-bg: #1a1a1a;
}

/* PDF Dark Mode - Invert colors */
[data-theme="dark"] .pdf-page {
    filter: invert(1) hue-rotate(180deg);
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

[data-theme="dark"] .pdf-page canvas {
    filter: invert(1) hue-rotate(180deg);
}

/* ========================================
   Base & Reset
   ======================================== */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.hidden {
    display: none !important;
}

/* ========================================
   Loading Screen
   ======================================== */

.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.loading-content {
    text-align: center;
    padding: 2rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.5rem;
}

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

.loading-content h2 {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.loading-content p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.progress-bar {
    width: 300px;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.progress-fill {
    height: 100%;
    background: var(--accent-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* ========================================
   Upload Screen
   ======================================== */

.upload-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.upload-container {
    max-width: 500px;
    text-align: center;
}

.book-cover {
    margin-bottom: 1.5rem;
}

.cover-art {
    width: 150px;
    height: 220px;
    background: linear-gradient(135deg, #8b4513 0%, #654321 100%);
    border-radius: 8px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-family: serif;
    font-size: 2rem;
    writing-mode: vertical-rl;
    text-orientation: upright;
    box-shadow: var(--shadow-lg);
}

.upload-container h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.description {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    padding: 0 1rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--content-bg);
}

.upload-area:hover {
    border-color: var(--accent-color);
    background: var(--hover-bg);
}

.upload-area.drag-over {
    border-color: var(--accent-color);
    background: var(--hover-bg);
    transform: scale(1.02);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.upload-area p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.upload-note {
    margin-top: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.upload-note code {
    background: var(--sidebar-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.upload-note small {
    display: block;
    margin-top: 0.5rem;
    opacity: 0.7;
}

/* ========================================
   Advertisement Containers
   ======================================== */

.ad-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: var(--sidebar-bg);
    min-height: 90px;
}

.ad-container ins.adsbygoogle {
    display: block;
    width: 100%;
    text-align: center;
}

.ad-placeholder {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    opacity: 0.6;
}

.ad-placeholder span {
    display: block;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

/* Header Ad */
.ad-header {
    min-height: 90px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-color);
}

.ad-header ins.adsbygoogle {
    min-height: 90px;
}

/* Sidebar Ad */
.ad-sidebar {
    margin: 1rem;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    min-height: 250px;
}

.ad-sidebar ins.adsbygoogle {
    min-height: 250px;
}

/* Mid-content Ad */
.ad-mid-content {
    margin: 3rem auto;
    max-width: var(--content-width);
    border-radius: 8px;
}

/* Footer Ad */
.ad-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    min-height: 90px;
}

/* Hide sidebar ad on mobile */
@media (max-width: 1024px) {
    .ad-sidebar {
        display: none;
    }
}

/* Responsive header ad */
@media (max-width: 768px) {
    .ad-header {
        min-height: 50px;
        padding: 0.5rem;
    }

    .ad-header ins.adsbygoogle {
        min-height: 50px;
    }
}

/* ========================================
   Reader Interface
   ======================================== */

.reader-interface {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Bar */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--content-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
}

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

.icon-btn svg {
    width: 22px;
    height: 22px;
}

.book-title {
    flex: 1;
    text-align: center;
    padding: 0 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.top-actions {
    display: flex;
    gap: 0.5rem;
}

/* Reader Layout */
.reader-layout {
    display: flex;
    flex: 1;
}

/* ========================================
   Sidebar (Table of Contents)
   ======================================== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    z-index: 200;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar.open {
    transform: translateX(0);
}

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

.sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

/* PDF Navigation */
.pdf-navigation {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.pdf-navigation label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.page-input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.page-input-group input {
    width: 60px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--content-bg);
    color: var(--text-color);
    text-align: center;
}

.btn-small {
    padding: 0.5rem 1rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-small:hover {
    opacity: 0.9;
}

.thumbnail-container {
    flex: 1;
    overflow-y: auto;
    margin-top: 1rem;
    max-height: 400px;
}

.thumbnail {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.2s ease;
}

.thumbnail:hover {
    background: var(--hover-bg);
}

.thumbnail.active {
    background: var(--hover-bg);
    border-left: 3px solid var(--accent-color);
}

.thumbnail img {
    width: 60px;
    height: 80px;
    object-fit: cover;
    border-radius: 2px;
    border: 1px solid var(--border-color);
    background: white;
}

.thumbnail span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* TOC Container */
.toc-container {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

/* Book Info in Sidebar */
.book-info {
    padding: 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.book-cover-small {
    width: 80px;
    height: 120px;
    background: linear-gradient(135deg, #8b4513 0%, #654321 100%);
    border-radius: 6px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-family: serif;
    font-size: 1.25rem;
    writing-mode: vertical-rl;
    text-orientation: upright;
    box-shadow: var(--shadow);
}

.book-info h4 {
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    font-family: var(--font-serif);
}

.book-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Progress Info */
.progress-info {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    background: var(--sidebar-bg);
}

/* Continue Reading Button */
.chapter-end-nav {
    text-align: center;
    padding: 3rem 0;
}

#continue-reading {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.toc-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
    cursor: pointer;
}

.toc-item:hover {
    background: var(--hover-bg);
}

.toc-item.active {
    background: var(--hover-bg);
    border-left-color: var(--accent-color);
    font-weight: 500;
}

.toc-item .chapter-number {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.1rem;
}

/* Desktop sidebar */
@media (min-width: 1025px) {
    .sidebar {
        position: sticky;
        transform: none;
        height: calc(100vh - 61px);
    }
    
    #menu-toggle {
        display: none;
    }
    
    #sidebar-close {
        display: none;
    }
}

/* ========================================
   Content Area
   ======================================== */

.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Reading Progress Bar */
.reading-progress {
    position: sticky;
    top: 61px;
    z-index: 50;
    height: 3px;
    background: var(--border-color);
}

.progress-indicator {
    height: 100%;
    background: var(--accent-color);
    width: 0%;
    transition: width 0.1s linear;
}

/* Reading Container */
.reading-container {
    flex: 1;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
}

@media (min-width: 768px) {
    .reading-container {
        padding: 3rem 2rem;
    }
}

/* ========================================
   PDF Viewer
   ======================================== */

.pdf-viewer {
    background: var(--pdf-bg);
    min-height: 100%;
    padding: 2rem 1rem;
}

.pdf-pages-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.pdf-page {
    background: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-radius: 4px;
    overflow: hidden;
    max-width: 100%;
}

.pdf-page canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.pdf-page-number {
    text-align: center;
    padding: 0.5rem;
    background: rgba(0,0,0,0.05);
    font-size: 0.8rem;
    color: #666;
}

/* PDF Text Layer for Search */
.pdf-text-layer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    line-height: 1;
}

.pdf-text-layer > span {
    position: absolute;
    color: transparent;
    cursor: text;
    transform-origin: 0% 0%;
}

.pdf-text-layer .highlight {
    background-color: rgba(255, 255, 0, 0.4);
    border-radius: 2px;
}

.pdf-text-layer .highlight-current {
    background-color: rgba(255, 165, 0, 0.6);
}

/* ========================================
   EPUB Chapter Content
   ======================================== */

.chapter-content {
    font-family: var(--font-serif);
    font-size: 18px;
    line-height: 1.6;
}

.chapter-content h1,
.chapter-content h2,
.chapter-content h3 {
    font-family: var(--font-serif);
    margin: 2rem 0 1rem;
    line-height: 1.3;
}

.chapter-content h1 {
    font-size: 1.8em;
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.chapter-content h2 {
    font-size: 1.4em;
    margin-top: 2.5rem;
}

.chapter-content p {
    margin-bottom: 1.25em;
    text-align: justify;
    hyphens: auto;
}

.chapter-content p:first-of-type::first-letter {
    font-size: 3em;
    float: left;
    line-height: 0.8;
    padding-right: 0.1em;
    font-weight: 600;
    color: var(--accent-color);
}

.chapter-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
    border-radius: 4px;
}

.chapter-content blockquote {
    margin: 2rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--accent-color);
    background: var(--sidebar-bg);
    font-style: italic;
}

.chapter-content blockquote p {
    margin: 0;
}

.chapter-separator {
    text-align: center;
    margin: 3rem 0;
    color: var(--text-muted);
    font-size: 1.5rem;
    letter-spacing: 0.5em;
}

/* ========================================
   Search Panel
   ======================================== */

.search-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(100%, 400px);
    background: var(--content-bg);
    box-shadow: var(--shadow-lg);
    z-index: 300;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.search-panel.open {
    transform: translateX(0);
}

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

.search-header h3 {
    font-size: 1.1rem;
}

.search-input-container {
    padding: 1rem;
    display: flex;
    gap: 0.5rem;
}

.search-input-container input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--content-bg);
    color: var(--text-color);
    font-size: 0.95rem;
}

.btn-primary {
    padding: 0.75rem 1.25rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
}

.btn-primary:hover {
    opacity: 0.9;
}

.search-options {
    padding: 0 1rem 1rem;
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.search-options label {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
}

.search-status {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.search-results {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.search-result {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.2s ease;
}

.search-result:hover {
    background: var(--hover-bg);
}

.search-result.active {
    background: var(--hover-bg);
    border-left: 3px solid var(--accent-color);
}

.search-result .result-page {
    font-size: 0.75rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.search-result .result-text {
    font-size: 0.9rem;
    color: var(--text-color);
    line-height: 1.4;
}

.search-result .result-text mark {
    background: rgba(255, 255, 0, 0.4);
    color: inherit;
    font-weight: 600;
}

/* ========================================
   Chapter Navigation
   ======================================== */

.chapter-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--content-bg);
    gap: 1rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--border-color);
    background: var(--content-bg);
    color: var(--text-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.nav-btn:hover:not(:disabled) {
    background: var(--hover-bg);
    border-color: var(--accent-color);
}

.nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.nav-btn svg {
    width: 18px;
    height: 18px;
}

.nav-info {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

@media (max-width: 480px) {
    .nav-btn span {
        display: none;
    }
    
    .nav-btn {
        padding: 0.75rem;
    }
}

/* ========================================
   Settings Panel
   ======================================== */

.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(100%, 360px);
    background: var(--content-bg);
    box-shadow: var(--shadow-lg);
    z-index: 300;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
}

.settings-panel.open {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--content-bg);
    z-index: 10;
}

.settings-header h3 {
    font-size: 1.1rem;
}

.settings-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.settings-section label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* Theme Options */
.theme-options {
    display: flex;
    gap: 1rem;
}

.theme-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    background: var(--content-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    border-color: var(--accent-color);
}

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

.theme-preview {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.theme-preview.light {
    background: #ffffff;
}

.theme-preview.sepia {
    background: #fdf6e3;
}

.theme-preview.dark {
    background: #16213e;
    border-color: #e94560;
}

/* Font Size Control */
.font-size-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.size-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    background: var(--content-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

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

#font-size-value {
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 50px;
    text-align: center;
}

/* Zoom Control */
.zoom-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

#zoom-value {
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 50px;
    text-align: center;
}

/* Select & Range Inputs */
.settings-section select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--content-bg);
    color: var(--text-color);
    font-size: 0.95rem;
    cursor: pointer;
}

.settings-section input[type="range"] {
    width: 100%;
    margin-bottom: 0.5rem;
}

#line-height-value {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 150;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

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

/* ========================================
   Responsive Adjustments
   ======================================== */

@media (max-width: 768px) {
    :root {
        --content-width: 100%;
    }
    
    .reading-container {
        padding: 1.5rem 1rem;
    }
    
    .chapter-content {
        font-size: 17px;
        line-height: 1.7;
    }
    
    .chapter-content h1 {
        font-size: 1.5em;
    }
    
    .ad-mid-content {
        margin: 2rem 0;
    }
    
    .pdf-viewer {
        padding: 1rem 0.5rem;
    }
}

@media (max-width: 480px) {
    .chapter-content {
        font-size: 16px;
    }
    
    .chapter-content p:first-of-type::first-letter {
        font-size: 2.5em;
    }
    
    .settings-panel,
    .search-panel {
        width: 100%;
    }
    
    .search-input-container {
        flex-direction: column;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .top-bar,
    .sidebar,
    .chapter-nav,
    .settings-panel,
    .search-panel,
    .ad-container,
    .reading-progress {
        display: none !important;
    }
    
    .content-area {
        margin: 0;
    }
    
    .reading-container {
        max-width: none;
        padding: 0;
    }
    
    .chapter-content {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .pdf-page {
        filter: none !important;
        box-shadow: none;
        page-break-after: always;
    }
}

/* ========================================
   Scrollbar Styles
   ======================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--sidebar-bg);
}

/* ========================================
   Loading States
   ======================================== */

.pdf-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--text-muted);
}

.pdf-loading .spinner {
    width: 30px;
    height: 30px;
    margin-right: 1rem;
    border-width: 3px;
}