/**
 * EPUB Reader Styles
 * Enhanced styles for displaying HTML content in encrypted EPUB format
 */

/* EPUB Container */
.epub-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    line-height: 1.6;
    font-family: var(--epub-font-family, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif);
    background: var(--epub-background, #ffffff);
    color: var(--epub-text-color, #333333);
    min-height: 70vh;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    overflow-x: hidden;
    outline: none;
}

.epub-container:focus {
    box-shadow: 0 0 0 2px var(--focus-color, #005fcc);
}

/* EPUB Controls */
.epub-controls {
    display: none; /* Hidden by default, shown when EPUB is loaded */
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem;
    background: var(--control-background, #f8f9fa);
    border-radius: 6px;
    margin-bottom: 1rem;
}

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

.chapter-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 200px;
}

.chapter-title {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary, #333);
    text-align: center;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chapter-progress {
    font-size: 0.875rem;
    color: var(--text-secondary, #666);
    margin-top: 0.25rem;
}

.epub-options {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.font-size-slider {
    width: 100px;
    margin: 0 0.5rem;
    accent-color: var(--primary-color, #005fcc);
}

/* EPUB Content Typography */
.epub-container h1,
.epub-container h2,
.epub-container h3,
.epub-container h4,
.epub-container h5,
.epub-container h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    line-height: 1.3;
    color: var(--heading-color, #2c3e50);
    scroll-margin-top: 2rem;
}

.epub-container h1 {
    font-size: 2.25rem;
    font-weight: 700;
    border-bottom: 2px solid var(--border-color, #e1e5e9);
    padding-bottom: 0.5rem;
}

.epub-container h2 {
    font-size: 1.875rem;
    font-weight: 600;
}

.epub-container h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

.epub-container h4 {
    font-size: 1.25rem;
    font-weight: 500;
}

.epub-container h5 {
    font-size: 1.125rem;
    font-weight: 500;
}

.epub-container h6 {
    font-size: 1rem;
    font-weight: 500;
}

.epub-container p {
    margin-bottom: 1rem;
    text-align: justify;
    hyphens: auto;
}

.epub-container blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--accent-color, #3498db);
    background: var(--blockquote-background, #f8f9fa);
    font-style: italic;
    color: var(--blockquote-color, #5a6c7d);
}

.epub-container pre {
    background: var(--code-background, #f4f4f4);
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.4;
}

.epub-container code {
    background: var(--inline-code-background, #f1f3f4);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875em;
}

.epub-container ul,
.epub-container ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.epub-container li {
    margin-bottom: 0.5rem;
}

.epub-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.epub-container th,
.epub-container td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color, #e1e5e9);
}

.epub-container th {
    background: var(--table-header-background, #f8f9fa);
    font-weight: 600;
    color: var(--table-header-color, #2c3e50);
}

.epub-container tr:hover {
    background: var(--table-row-hover, #f8f9fa);
}

/* EPUB Images */
.epub-container img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.5rem auto;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.epub-container figure {
    margin: 1.5rem 0;
    text-align: center;
}

.epub-container figcaption {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--caption-color, #666);
    font-style: italic;
}

/* EPUB Links */
.epub-container a {
    color: var(--link-color, #3498db);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
}

.epub-container a:hover {
    color: var(--link-hover-color, #2980b9);
    border-bottom-color: currentColor;
}

.epub-container a:focus {
    outline: 2px solid var(--focus-color, #005fcc);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Skip Links for EPUB */
.epub-container .skip-links {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--skip-link-background, #000);
    color: var(--skip-link-color, #fff);
    padding: 8px;
    text-decoration: none;
    border-radius: 0 0 4px 4px;
    z-index: 100;
    transition: top 0.3s;
}

.epub-container .skip-links:focus {
    top: 0;
}

/* Text-only mode */
.epub-container.text-only-mode {
    font-family: 'Georgia', 'Times New Roman', serif;
    max-width: 600px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.epub-container.text-only-mode img,
.epub-container.text-only-mode figure,
.epub-container.text-only-mode video,
.epub-container.text-only-mode audio {
    display: none;
}

.epub-container.text-only-mode h1,
.epub-container.text-only-mode h2,
.epub-container.text-only-mode h3,
.epub-container.text-only-mode h4,
.epub-container.text-only-mode h5,
.epub-container.text-only-mode h6 {
    font-family: inherit;
    color: var(--text-primary, #333);
}

/* High contrast mode for EPUB */
.high-contrast .epub-container {
    background: #000000;
    color: #ffffff;
    border: 2px solid #ffffff;
}

.high-contrast .epub-container h1,
.high-contrast .epub-container h2,
.high-contrast .epub-container h3,
.high-contrast .epub-container h4,
.high-contrast .epub-container h5,
.high-contrast .epub-container h6 {
    color: #ffff00;
    border-color: #ffffff;
}

.high-contrast .epub-container a {
    color: #00ffff;
    text-decoration: underline;
}

.high-contrast .epub-container a:hover,
.high-contrast .epub-container a:focus {
    color: #ffffff;
    background: #0000ff;
}

.high-contrast .epub-container blockquote {
    background: #333333;
    border-color: #ffffff;
    color: #ffffff;
}

.high-contrast .epub-container pre,
.high-contrast .epub-container code {
    background: #333333;
    color: #ffffff;
    border: 1px solid #ffffff;
}

.high-contrast .epub-container table {
    border: 2px solid #ffffff;
}

.high-contrast .epub-container th {
    background: #333333;
    color: #ffff00;
    border: 1px solid #ffffff;
}

.high-contrast .epub-container td {
    border: 1px solid #ffffff;
}

.high-contrast .epub-container tr:hover {
    background: #444444;
}

/* Mobile responsiveness for EPUB */
@media (max-width: 768px) {
    .epub-container {
        padding: 1rem;
        margin: 0.5rem;
        font-size: 1rem;
    }
    
    .epub-controls {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .chapter-controls {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .epub-options {
        justify-content: center;
    }
    
    .epub-container h1 {
        font-size: 1.75rem;
    }
    
    .epub-container h2 {
        font-size: 1.5rem;
    }
    
    .epub-container h3 {
        font-size: 1.25rem;
    }
    
    .epub-container table {
        font-size: 0.875rem;
    }
    
    .epub-container th,
    .epub-container td {
        padding: 0.5rem;
    }
}

/* Print styles for EPUB */
@media print {
    .epub-controls {
        display: none !important;
    }
    
    .epub-container {
        box-shadow: none;
        border: none;
        background: white;
        color: black;
        max-width: none;
        margin: 0;
        padding: 0;
    }
    
    .epub-container a {
        color: black;
        text-decoration: underline;
    }
    
    .epub-container img {
        max-width: 100%;
        page-break-inside: avoid;
    }
    
    .epub-container h1,
    .epub-container h2,
    .epub-container h3 {
        page-break-after: avoid;
    }
    
    .epub-container blockquote,
    .epub-container pre {
        page-break-inside: avoid;
    }
}

/* Focus indicators for better accessibility */
.epub-container *:focus {
    outline: 2px solid var(--focus-color, #005fcc);
    outline-offset: 1px;
}

/* Smooth scrolling for internal links */
.epub-container {
    scroll-behavior: smooth;
}

/* Selection styling */
.epub-container ::selection {
    background: var(--selection-background, rgba(52, 152, 219, 0.3));
    color: var(--selection-color, inherit);
}

/* Loading state for EPUB content */
.epub-container.loading {
    opacity: 0.7;
    pointer-events: none;
}

.epub-container.loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px;
    border: 2px solid var(--primary-color, #005fcc);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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