/* 
   REIMAGINING TRANSPORTATION IN THE D.R. CONGO
   Reader Stylesheet - Interactive Book Previewer Overlay
*/

/* Reader Overlay Modal */
.reader-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(3, 5, 5, 0.95);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.reader-modal.active {
    opacity: 1;
    pointer-events: auto;
}

/* Modal Inner Container */
.reader-container {
    width: 92%;
    max-width: 1200px;
    height: 88vh;
    background: #101414;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.96);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.reader-modal.active .reader-container {
    transform: scale(1);
}

/* Reader Header */
.reader-header {
    padding: 1.2rem 2rem;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.reader-title-info h3 {
    font-size: 1.15rem;
    color: var(--white);
    margin-bottom: 0.2rem;
}

.reader-title-info p {
    font-size: 0.85rem;
    color: var(--primary-teal);
    font-weight: 600;
}

/* Accessibility & Control Panel */
.reader-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    padding-right: 1.5rem;
}

.control-group:last-child {
    border-right: none;
    padding-right: 0;
}

.control-label {
    font-size: 0.8rem;
    color: var(--gray-medium);
    font-weight: 600;
    text-transform: uppercase;
}

/* Theme Options */
.theme-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.theme-btn.active {
    border-color: var(--primary-teal);
    transform: scale(1.1);
}

.theme-btn-paper { background-color: #f7f3eb; }
.theme-btn-sepia { background-color: #f4ecd8; }
.theme-btn-dark { background-color: #1e1e1e; }

/* Font Size Actions */
.size-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--white);
    width: 32px;
    height: 32px;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition-smooth);
}

.size-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-teal);
}

/* Close Button */
.reader-close {
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.8rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 0 0.5rem;
}

.reader-close:hover {
    color: var(--accent-gold);
    transform: rotate(90deg);
}

/* Reader Workspace (Split Layout) */
.reader-body {
    flex: 1;
    display: grid;
    grid-template-columns: 300px 1fr;
    height: calc(100% - 68px);
}

/* Left Sidebar - Table of Contents */
.reader-sidebar {
    background: rgba(255, 255, 255, 0.01);
    border-right: 1px solid rgba(255, 255, 255, 0.08);
    overflow-y: auto;
    padding: 1.5rem;
}

.sidebar-title {
    font-size: 0.85rem;
    color: var(--gray-medium);
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 1.2rem;
}

.toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toc-item button {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--gray-light);
    padding: 0.8rem 1rem;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    font-family: var(--font-body);
    transition: var(--transition-smooth);
}

.toc-item button:hover {
    background: rgba(255, 255, 255, 0.03);
    color: var(--accent-gold);
}

.toc-item.active button {
    background: rgba(61, 124, 122, 0.15);
    color: var(--white);
    font-weight: 600;
    border-left: 3px solid var(--primary-teal);
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

/* Right Content Pane - Reading Screen */
.reader-content-pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

/* Book Page Styling */
.reader-page-viewport {
    flex: 1;
    overflow-y: auto;
    padding: 3.5rem 4.5rem;
    display: flex;
    justify-content: center;
}

.book-page-canvas {
    max-width: 680px;
    width: 100%;
    font-size: 1.1rem;
    line-height: 1.85;
    transition: var(--transition-smooth);
    padding: 3.5rem 4.5rem;
    border-radius: 6px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    height: fit-content;
    margin: 2rem auto;
}

/* Canvas Theme Modifiers */
.theme-paper {
    background-color: #fdfaf2;
    color: #2b2b2b;
}

.theme-sepia {
    background-color: #f5edd6;
    color: #433422;
}

.theme-dark {
    background-color: #1a1e1e;
    color: #e2e8e8;
}

/* Book Content Elements styling inside Canvas */
.book-page-canvas h2 {
    text-align: left;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    color: inherit;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 0.8rem;
}

.theme-dark .book-page-canvas h2 {
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

.book-page-canvas h2::after {
    display: none;
}

.book-page-canvas h3 {
    font-size: 1.25rem;
    margin: 1.8rem 0 1rem;
    color: inherit;
    font-weight: 700;
}

.book-page-canvas p {
    margin-bottom: 1.5rem;
}

.book-page-canvas blockquote {
    border-left: 3px solid var(--primary-teal);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    opacity: 0.9;
}

.book-page-canvas .toc-preview {
    margin-top: 2rem;
}

.book-page-canvas .toc-preview-item {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed rgba(0, 0, 0, 0.15);
    padding: 0.6rem 0;
}

.theme-dark .book-page-canvas .toc-preview-item {
    border-bottom-color: rgba(255, 255, 255, 0.15);
}

/* Reading Navigation Footer */
.reader-footer {
    padding: 1.2rem 2.5rem;
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

.page-indicator {
    font-size: 0.9rem;
    color: var(--gray-medium);
    font-weight: 500;
}

.nav-page-btn {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--white);
    padding: 0.5rem 1.2rem;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-smooth);
}

.nav-page-btn:hover:not(:disabled) {
    border-color: var(--primary-teal);
    background: rgba(61, 124, 122, 0.1);
}

.nav-page-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .reader-body {
        grid-template-columns: 1fr;
    }
    
    .reader-sidebar {
        display: none; /* Collapsed on mobile, TOC accessible within reader dropdown or contents page */
    }
    
    .reader-page-viewport {
        padding: 1.5rem 1rem;
    }
    
    .book-page-canvas {
        padding: 2.5rem 3rem;
        margin: 1rem auto;
    }
}

@media (max-width: 768px) {
    .reader-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .reader-controls {
        justify-content: space-between;
    }
    
    .control-group {
        padding-right: 0.8rem;
        gap: 0.4rem;
    }
    
    .reader-close {
        position: absolute;
        top: 1rem;
        right: 1.2rem;
    }

    .book-page-canvas {
        padding: 2rem 1.5rem;
        margin: 0.5rem auto;
        font-size: 1rem;
    }
}