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

:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --accent-primary: #007bff;
    --accent-secondary: #6f42c1;
    --border-color: #dee2e6;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --shadow-dark: rgba(0, 0, 0, 0.25);
    
    /* Typography */
    --font-serif: 'Merriweather', serif;
    --font-sans: 'Inter', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --border-color: #404040;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --shadow-dark: rgba(0, 0, 0, 0.6);
}

/* Sepia Theme */
[data-theme="sepia"] {
    --bg-primary: #f7f3e9;
    --bg-secondary: #f0ead6;
    --bg-tertiary: #e8dcc0;
    --text-primary: #5d4e37;
    --text-secondary: #8b7355;
    --text-muted: #a0916d;
    --border-color: #d2c5a0;
}

/* Base Typography */
html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    text-align: center;
    animation: pulse 2s ease-in-out infinite;
}

.loading-spinner .loading-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-bottom: var(--spacing-md);
    display: block;
    margin-left: auto;
    margin-right: auto;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.loading-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

/* App Container */
.app-container {
    display: grid;
    grid-template-rows: auto 1fr auto;
    grid-template-columns: 1fr;
    min-height: 100vh;
    position: relative;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px var(--shadow-light);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 400px;
    margin: 0 var(--spacing-lg);
}

.book-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-sm);
    transition: width var(--transition-medium);
    width: 10%;
}

.page-indicator {
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 60px;
    text-align: center;
}

/* Icon Buttons */
.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.icon-btn:active {
    transform: translateY(0);
}

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

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: -350px;
    width: 350px;
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    z-index: 200;
    transition: left var(--transition-medium);
    display: flex;
    flex-direction: column;
    box-shadow: 5px 0 20px var(--shadow-medium);
}

.sidebar.open {
    left: 0;
}

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

.sidebar-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.toc-nav {
    flex: 1;
    overflow-y: auto;
}

.toc-list {
    list-style: none;
    padding: var(--spacing-md);
}

.toc-list li {
    margin-bottom: var(--spacing-sm);
}

.toc-list a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}

.toc-list a:hover,
.toc-list a.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(4px);
}

/* Chapter hierarchy styles */
.toc-list a.chapter-main {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95em;
}

.toc-list a.chapter-sub {
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.toc-list li.toc-subitem {
    margin-left: var(--spacing-lg);
    border-left: 2px solid var(--border-color);
    padding-left: var(--spacing-sm);
}

.toc-list li.toc-subitem a {
    padding-left: var(--spacing-sm);
}

.toc-list li.toc-subitem a:hover,
.toc-list li.toc-subitem a.active {
    transform: translateX(2px);
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.bookmarks-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.bookmarks-list {
    list-style: none;
}

.bookmarks-list li {
    margin-bottom: var(--spacing-sm);
}

.bookmarks-list a {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.bookmarks-list a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}



/* Settings Panel */
.settings-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    z-index: 200;
    transition: right var(--transition-medium);
    display: flex;
    flex-direction: column;
    box-shadow: -5px 0 20px var(--shadow-medium);
}

.settings-panel.open {
    right: 0;
}

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

.settings-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.settings-content {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.setting-group {
    margin-bottom: var(--spacing-xl);
}

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

.font-size-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: center;
}

#font-size-display {
    font-weight: 500;
    color: var(--text-primary);
    min-width: 50px;
    text-align: center;
}

.theme-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.theme-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

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

#font-family-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

#font-family-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: 0;
}

.book-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    perspective: 1000px;
}

.book {
    max-width: 800px;
    width: 100%;
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px var(--shadow-medium);
    overflow: hidden;
    min-height: 600px;
}

.page {
    padding: var(--spacing-xxl);
    min-height: 800px;
    background: var(--bg-primary);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    max-width: 794px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    transform: translateX(100px);
    transition: all var(--transition-slow);
    font-family: var(--font-serif);
    line-height: 1.8;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.page.active {
    opacity: 1;
    transform: translateX(0);
    position: relative;
}

.page.prev {
    transform: translateX(-100px);
    opacity: 0;
}

.page h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    line-height: 1.2;
}

.page h2 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-xl) 0 var(--spacing-lg);
    line-height: 1.3;
}

.page h3 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    line-height: 1.4;
}

.page p {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: justify;
    text-indent: 2rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.page p:first-of-type {
    text-indent: 0;
}

.page blockquote {
    border-left: 4px solid var(--accent-primary);
    margin: var(--spacing-xl) 0;
    font-style: italic;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.page ul, .page ol {
    margin: var(--spacing-lg) 0;
    padding-left: var(--spacing-xl);
}

.page li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.chapter-title {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.chapter-number {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

/* Navigation Controls */
.nav-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-xl);
    padding: 0 var(--spacing-md);
}

.nav-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px var(--shadow-light);
}

.nav-btn:hover:not(:disabled) {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-medium);
}

.nav-btn:active:not(:disabled) {
    transform: translateY(-1px);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

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

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
    backdrop-filter: blur(2px);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .header-center {
        margin: 0 var(--spacing-sm);
    }
    
    .book-title {
        display: none;
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .page {
        padding: var(--spacing-lg);
        min-height: 500px;
        overflow-y: auto;
    }
    
    .page h1 {
        font-size: 2rem;
    }
    
    .page h2 {
        font-size: 1.5rem;
    }
    
    .page p {
        font-size: 1rem;
        text-indent: 1rem;
    }
    
    .sidebar,
    .settings-panel {
        width: 300px;
    }
    
    .sidebar {
        left: -300px;
    }
    


    
    .settings-panel {
        right: -300px;
    }
    
    .nav-btn {
        width: 50px;
        height: 50px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .page {
        padding: var(--spacing-md);
    }
    
    .page h1 {
        font-size: 1.8rem;
    }
    
    .sidebar,
    .settings-panel {
        width: 280px;
    }
    
    .sidebar {
        left: -280px;
    }
    
    .settings-panel {
        right: -280px;
    }
    
    .progress-container {
        gap: var(--spacing-sm);
    }
    
    .page-indicator {
        font-size: 0.8rem;
        min-width: 50px;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .nav-controls,
    .sidebar,
    .settings-panel,
    .overlay {
        display: none !important;
    }
    
    .app-container {
        display: block;
    }
    
    .main-content {
        padding: 0;
    }
    
    .book {
        box-shadow: none;
        max-width: none;
        width: 100%;
    }
    
    .page {
        position: static !important;
        opacity: 1 !important;
        transform: none !important;
        page-break-after: always;
        min-height: auto;
        padding: 2rem;
    }
    
    .page:last-child {
        page-break-after: avoid;
    }
}

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

/* Book Cover Styles */
.book-cover {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 600px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #ffffff 100%);
    color: #2c2c2c;
    text-align: center;
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
    position: relative;
    overflow: hidden;
    animation: subtleGlow 6s ease-in-out infinite;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.6);
    border: 2px solid #e9ecef;
}

@keyframes subtleGlow {
    0%, 100% {
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.6);
    }
    50% {
        box-shadow: 0 30px 60px rgba(139, 95, 191, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.8);
    }
}

/* Corner decorative shapes */
.book-cover::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, #8B5FBF, #D8BFD8);
    border-radius: 50% 0 50% 0;
    opacity: 0.1;
    animation: rotateShape 10s linear infinite;
}

.book-cover::after {
    content: '';
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 100px;
    height: 100px;
    background: linear-gradient(-45deg, #9370DB, #DDA0DD);
    border-radius: 0 50% 0 50%;
    opacity: 0.1;
    animation: rotateShape 12s linear infinite reverse;
}

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

/* Additional decorative elements */
.cover-title::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 3px;
    background: linear-gradient(90deg, transparent, #8B5FBF, transparent);
    animation: expandLine 3s ease-out 1s both;
}

.cover-title::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 3px;
    background: linear-gradient(90deg, transparent, #8B5FBF, transparent);
    animation: expandLine 3s ease-out 1.5s both;
}

@keyframes expandLine {
    0% { width: 0; opacity: 0; }
    50% { opacity: 1; }
    100% { width: 150px; opacity: 0.7; }
}

.cover-title {
    position: relative;
    z-index: 3;
    padding: var(--spacing-xxl);
    animation: fadeInUp 2s ease-out;
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.cover-title h1 {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    line-height: 1.1;
    font-family: var(--font-serif);
    color: #2c2c2c;
    animation: letterFloat 4s ease-in-out infinite, textShine 6s ease-in-out infinite;
    letter-spacing: 3px;
    background: linear-gradient(45deg, #2c2c2c, #8B5FBF, #2c2c2c);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

@keyframes textShine {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.author-name {
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xl);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
    font-family: var(--font-sans);
    color: #555;
    animation: slideIn 2.5s ease-out 0.5s both, bounce 3s ease-in-out 3s infinite;
    letter-spacing: 2px;
    text-transform: uppercase;
}

@keyframes slideIn {
    0% {
        opacity: 0;
        transform: translateX(-50px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-3px) scale(1.02); }
}

.special-credits {
    font-size: 1.1rem;
    font-weight: 400;
    opacity: 0.8;
    font-family: var(--font-sans);
    color: #666;
    animation: fadeIn 3s ease-out 1s both, pulse 4s ease-in-out 4s infinite;
    text-shadow: none;
}

@keyframes fadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 0.8;
    }
}

@keyframes pulse {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

.special-credits p {
    margin-bottom: var(--spacing-md);
    text-indent: 0;
    transition: transform 0.3s ease;
}

.special-credits p:hover {
    transform: scale(1.05);
}

.special-credits strong {
    font-weight: 600;
    color: #8B5FBF;
    background: linear-gradient(45deg, #8B5FBF, #9370DB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Interactive elements */
.book-cover:hover .cover-title h1 {
    animation-duration: 1.5s;
}

.book-cover:hover::before {
    animation-duration: 3s;
}

.book-cover:hover::after {
    animation-duration: 8s;
}

/* Add subtle pulsing border effect */
.book-cover {
    border: 2px solid transparent;
    background-clip: padding-box;
}

.book-cover::before {
    border-radius: inherit;
}

/* Enhanced blockquote styles */
.page blockquote {
    border-left: 4px solid var(--accent-primary);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    font-style: italic;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    position: relative;
    box-shadow: 0 2px 10px var(--shadow-light);
}

.page blockquote::before {
    content: '"';
    font-size: 4rem;
    color: var(--accent-primary);
    position: absolute;
    top: -10px;
    left: 20px;
    font-family: Georgia, serif;
    opacity: 0.3;
}

.page blockquote cite {
    display: block;
    margin-top: var(--spacing-sm);
    font-style: normal;
    font-weight: 500;
    color: var(--accent-primary);
    text-align: right;
}

/* Chapter title enhancements */
.chapter-title {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.chapter-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-sm);
}



/* Responsive cover design */
@media (max-width: 768px) {
    .cover-title h1 {
        font-size: 3rem;
        letter-spacing: 1px;
    }
    
    .author-name {
        font-size: 1.4rem;
    }
    
    .special-credits {
        font-size: 1rem;
    }
    
    .book-cover {
        min-height: 500px;
    }
}

@media (max-width: 480px) {
    .cover-title h1 {
        font-size: 2.2rem;
        letter-spacing: 0.5px;
    }
    
    .author-name {
        font-size: 1.2rem;
    }
    
    .special-credits {
        font-size: 0.9rem;
    }
    
    .book-cover {
        min-height: 450px;
    }
}

/* Focus Styles */
button:focus,
select:focus,
a:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-sm);
}

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

/* Animation Classes */
.fade-in {
    animation: fadeIn var(--transition-medium) ease;
}

.slide-in-left {
    animation: slideInLeft var(--transition-medium) ease;
}

.slide-in-right {
    animation: slideInRight var(--transition-medium) ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

/* Page Flip Animation */
.page-flip-enter {
    transform: translateX(100%) rotateY(-90deg);
    opacity: 0;
}

.page-flip-enter-active {
    transform: translateX(0) rotateY(0deg);
    opacity: 1;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.page-flip-exit {
    transform: translateX(0) rotateY(0deg);
    opacity: 1;
}

.page-flip-exit-active {
    transform: translateX(-100%) rotateY(90deg);
    opacity: 0;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

#worldButton img {
    animation: worldPulse 2s ease-in-out infinite;
}
/* Animación del botón mundo - Zoom in/out ligero */
@keyframes worldPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

#worldButton {
    animation: worldPulse 2.5s ease-in-out infinite;
}

#worldButton img {
    width: 30px !important;
    height: 30px !important;
}