/* ==========================================================================
   MOE Tamil Interactive eBook - Book Styles
   ========================================================================== */

/* ==========================================================================
   Book Wrapper & Container
   ========================================================================== */

.book-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-container {
    position: relative;
    width: 100%;
    max-width: 1400px;
    height: 100%;
    perspective: 2000px;
    transform-style: preserve-3d;
}

/* ==========================================================================
   Flipbook Container
   ========================================================================== */

.flipbook {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    transform-style: preserve-3d;
    transition: transform var(--transition-normal);
}

/* Single Page View */
.flipbook.single-view {
    max-width: 720px;
}

/* Double Page View */
.flipbook.double-view {
    max-width: 1400px;
    max-height: 1200px;
    display: flex;
    gap: 4px;
}

.flipbook.double-view .page-wrapper {
    width: calc(50% - 2px);
}

/* ==========================================================================
   Page Styles
   ========================================================================== */

.page-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    background: var(--book-page);
    border-radius: var(--radius-sm);
    box-shadow: 
        0 0 5px rgba(0, 0, 0, 0.1),
        0 5px 15px rgba(0, 0, 0, 0.2),
        inset 0 0 50px rgba(139, 69, 19, 0.03);
    overflow: hidden;
    cursor: grab;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    transform-style: preserve-3d;
}

.page-wrapper:active {
    cursor: grabbing;
}

.page-wrapper.flipping {
    animation: pageFlip 0.6s ease-in-out;
    transform-origin: left center;
}

.page-wrapper.flipping-reverse {
    animation: pageFlipReverse 0.6s ease-in-out;
    transform-origin: right center;
}

@keyframes pageFlip {
    0% {
        transform: rotateY(0deg);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    }
    50% {
        transform: rotateY(-90deg);
        box-shadow: 20px 0 30px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: rotateY(-180deg);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    }
}

@keyframes pageFlipReverse {
    0% {
        transform: rotateY(0deg);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    }
    50% {
        transform: rotateY(90deg);
        box-shadow: -20px 0 30px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: rotateY(180deg);
        box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    }
}

/* Page Content */
.page-content {
    position: relative;
    width: 100%;
    height: 100%;
    padding: var(--spacing-xl);
    overflow-y: auto;
    background: linear-gradient(
        to right,
        rgba(0, 0, 0, 0.02) 0%,
        transparent 5%,
        transparent 95%,
        rgba(0, 0, 0, 0.02) 100%
    );
}

/* Page edge effect */
.page-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 100%;
    background: linear-gradient(
        to left,
        rgba(0, 0, 0, 0.08),
        transparent
    );
    pointer-events: none;
    z-index: 1;
}

/* Page texture */
.page-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

/* ==========================================================================
   Page Header & Footer
   ========================================================================== */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.page-chapter {
    font-family: var(--font-tamil);
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
}

.page-number {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.page-footer {
    position: absolute;
    bottom: var(--spacing-lg);
    left: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    justify-content: center;
    padding-top: var(--spacing-md) - 20px;
    border-top: 1px solid rgba(139, 69, 19, 0.2);
}

/* ==========================================================================
   Page Content Typography
   ========================================================================== */

.page-content h1 {
    font-family: var(--font-tamil);
    font-size: 1.8rem;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    position: relative;
}

.page-content h1::after {
    content: '';
    display: block;
    width: 80px;
    height: 3px;
    background: linear-gradient(to right, var(--secondary-color), var(--primary-color));
    margin: var(--spacing-md) auto 0;
    border-radius: 2px;
}

.page-content h2 {
    font-family: var(--font-tamil);
    font-size: 1.4rem;
    color: var(--primary-color);
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.page-content h3 {
    font-family: var(--font-tamil);
    font-size: 1.2rem;
    color: var(--primary-light);
    margin: var(--spacing-md) 0;
}

.page-content p {
    font-family: var(--font-tamil);
    font-size: 1rem;
    line-height: 2;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
    text-align: justify;
    text-indent: 2em;
}

.page-content ul, .page-content ol {
    margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-tamil);
}

.page-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
    color: var(--text-dark);
}

.page-content blockquote {
    margin: var(--spacing-lg) var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(139, 69, 19, 0.05);
    border-left: 4px solid var(--secondary-color);
    font-style: italic;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ==========================================================================
   Page Images
   ========================================================================== */

.page-image {
    width: 100%;
    max-width: 600px;
    margin: var(--spacing-lg) auto;
    display: block;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.page-image-caption {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
    font-style: italic;
}

.image-float-left {
    float: left;
    margin: 0 var(--spacing-lg) var(--spacing-md) 0;
    max-width: 200px;
}

.image-float-right {
    float: right;
    margin: 0 0 var(--spacing-md) var(--spacing-lg);
    max-width: 200px;
}

/* ==========================================================================
   Cover Page
   ========================================================================== */

.page-cover {
    /* background: var(--book-cover);
    color: var(--text-primary); */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.page-cover .page-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.cover-logo {
    width: 580px;
    height: auto;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

/* .cover-title {
    font-family: var(--font-tamil);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-light);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    margin-bottom: var(--spacing-md);
} */

/* .cover-subtitle {
    font-family: var(--font-tamil);
    font-size: 1.5rem;
    color: var(--book-page);
    margin-bottom: var(--spacing-xl);
} */

/* .cover-series {
    font-size: 1.2rem;
    color: var(--secondary-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--secondary-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.cover-footer {
    position: absolute;
    bottom: var(--spacing-xl);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
} */

/* ==========================================================================
   Table of Contents Page
   ========================================================================== */

.toc-page .page-content {
    padding: var(--spacing-xl);
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-lg) 0;
}

.toc-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px dotted rgba(139, 69, 19, 0.3);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toc-item:hover {
    background: rgba(139, 69, 19, 0.05);
    padding-left: var(--spacing-sm);
}

.toc-item-title {
    font-family: var(--font-tamil);
    font-size: 1.1rem;
    color: var(--primary-color);
    flex: 1;
}

.toc-item-page {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-left: var(--spacing-md);
}

.toc-chapter {
    font-family: var(--font-tamil);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--secondary-color);
}

/* ==========================================================================
   Navigation Arrows
   ========================================================================== */

.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    z-index: var(--z-base);
}

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

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

.nav-arrow:hover {
    background: linear-gradient(135deg, rgba(218, 165, 32, 0.3), rgba(218, 165, 32, 0.1));
    transform: translateY(-50%) scale(1.05);
    box-shadow: var(--glow);
}

.nav-arrow:active {
    transform: translateY(-50%) scale(0.98);
}

.nav-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

.nav-arrow svg {
    transition: transform var(--transition-fast);
}

.nav-prev:hover svg {
    transform: translateX(-3px);
}

.nav-next:hover svg {
    transform: translateX(3px);
}

/* ==========================================================================
   Page Slider / Dragger
   ========================================================================== */

.page-slider-container {
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.5), transparent);
}

.page-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

.page-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--secondary-color);
    border-radius: var(--radius-full);
    cursor: grab;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.page-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--glow);
}

.page-slider::-webkit-slider-thumb:active {
    cursor: grabbing;
}

.page-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--secondary-color);
    border: none;
    border-radius: var(--radius-full);
    cursor: grab;
    box-shadow: var(--shadow-md);
}

.page-thumbnails {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-xs) 0;
    scrollbar-width: thin;
}

.page-thumb {
    flex-shrink: 0;
    width: 40px;
    height: 50px;
    background: var(--book-page);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.page-thumb:hover {
    transform: scale(1.1);
    border-color: var(--secondary-color);
}

.page-thumb.active {
    border-color: var(--secondary-color);
    box-shadow: var(--glow);
}

/* ==========================================================================
   Thumbnail View
   ========================================================================== */

.thumbnail-view {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    overflow-y: auto;
    padding: var(--spacing-xl);
    z-index: var(--z-dropdown);
}

.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.thumbnail-item {
    position: relative;
    aspect-ratio: 3/4;
    background: var(--book-page);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.thumbnail-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.thumbnail-item.active {
    outline: 3px solid var(--secondary-color);
    outline-offset: 2px;
}

.thumbnail-page-number {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: var(--text-primary);
    text-align: center;
    padding: var(--spacing-xs);
    font-size: 0.85rem;
}

/* ==========================================================================
   Zoom Styles
   ========================================================================== */

.flipbook.zoomed {
    transform: scale(var(--zoom-level, 1));
    transform-origin: center center;
    cursor: move;
}

/* ==========================================================================
   Responsive Styles
   ========================================================================== */

@media screen and (max-width: 1024px) {
    .flipbook.double-view {
        flex-direction: column;
        max-width: 500px;
    }
    
    .flipbook.double-view .page-wrapper {
        width: 100%;
    }
    
    .nav-arrow {
        width: 40px;
        height: 60px;
    }
}

@media screen and (max-width: 768px) {
    .book-wrapper {
        padding: var(--spacing-md);
    }
    
    .page-content {
        padding: var(--spacing-lg);
    }
    
    .page-content h1 {
        font-size: 1.5rem;
    }
    
    .page-content p {
        font-size: 0.95rem;
        text-indent: 1.5em;
    }
    
    .cover-title {
        font-size: 1.8rem;
    }
    
    .cover-subtitle {
        font-size: 1.2rem;
    }
    
    .nav-prev {
        left: var(--spacing-xs);
    }
    
    .nav-next {
        right: var(--spacing-xs);
    }
}

@media screen and (max-width: 480px) {
    .page-content {
        padding: var(--spacing-md);
    }
    
    .page-header {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
    
    .nav-arrow {
        width: 35px;
        height: 50px;
    }
    
    .thumbnail-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
}

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

@media print {
    .nav-arrow,
    .page-slider-container,
    .view-controls {
        display: none !important;
    }
    
    .book-wrapper {
        padding: 0;
    }
    
    .page-wrapper {
        box-shadow: none;
        break-inside: avoid;
        page-break-inside: avoid;
    }
}