:root {
    /* BASE VARIABLES */
    --brand: #D4AF37;
    --brand-dim: rgba(212, 175, 55, 0.15);
    
    --bg: #121212;
    --bg-glass: rgba(18, 18, 18, 0.85);
    --surface: #1c1c1e;
    --surface-alt: #2c2c2e;
    
    --text: #F2F2F7;
    --text-muted: #8E8E93;
    
    --border: rgba(255, 255, 255, 0.15);
    
    --danger: #FF453A;
    
    --radius-s: 8px;
    --radius-m: 14px;
    --radius-l: 22px;
    
    --shadow-m: 0 8px 30px rgba(0,0,0,0.5);
    --transition: 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* --- THEMES --- */
body.theme-light {
    --bg: #FFFFFF;
    --bg-glass: rgba(248, 248, 248, 0.85);
    --surface: #F2F2F7;
    --surface-alt: #E5E5EA;
    --text: #1C1C1E;
    --text-muted: #636366;
    --border: rgba(0, 0, 0, 0.12);
    --brand: #007AFF;
    --brand-dim: rgba(0, 122, 255, 0.1);
}
body.theme-sepia {
    --bg: #F4ECD8;
    --bg-glass: rgba(244, 236, 216, 0.85);
    --surface: #E8DCC0;
    --surface-alt: #DBCBA8;
    --text: #5B4636;
    --text-muted: #8A7666;
    --border: rgba(91, 70, 54, 0.15);
    --brand: #A05A2C;
    --brand-dim: rgba(160, 90, 44, 0.1);
}
body.theme-terminal {
    --terminal-color: #00FF41; /* Default, can be overridden by JS */
    --bg: #000000;
    --bg-glass: rgba(0, 20, 0, 0.85);
    --surface: #0D1117;
    --surface-alt: #161B22;
    --text: var(--terminal-color);
    --text-muted: color-mix(in srgb, var(--terminal-color) 50%, #000);
    --border: color-mix(in srgb, var(--terminal-color) 30%, transparent);
    --brand: var(--terminal-color);
    --brand-dim: color-mix(in srgb, var(--terminal-color) 15%, transparent);
}

/* Force text color in terminal mode to override white defaults */
body.theme-terminal, body.theme-terminal * {
    color: var(--terminal-color);
    border-color: var(--border);
}
body.theme-terminal .btn-primary { color: #000 !important; background: var(--terminal-color); border:none; }
body.theme-terminal .book-card { border-color: var(--border); }

/* TERMINAL OVERLAY FOR COVERS */
body.theme-terminal .book-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background-color: var(--terminal-color);
    mix-blend-mode: multiply;
    opacity: 0.6;
    pointer-events: none;
    transition: opacity 0.3s;
}
body.theme-terminal .book-card:hover .book-cover::after {
    opacity: 0.3;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; -webkit-font-smoothing: antialiased; }
body {
    background-color: var(--bg); color: var(--text); font-size: 16px; line-height: 1.5;
    overflow: hidden; height: 100%; width: 100%; display: flex; flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Ensure Reader Text Selection works */
#viewer-content { user-select: text; -webkit-user-select: text; }

/* --- PRINT STYLES --- */
#print-container { display: none; }

@media print {
    @page { size: A4; margin: 0; }
    body > *:not(#print-container) { display: none !important; }
    body { background: white !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; height: 100%; overflow: visible; }
    
    #print-container {
        display: flex !important;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        width: 210mm;
        height: 297mm;
        position: absolute;
        top: 0;
        left: 0;
        background: white;
    }

    .print-wrapper {
        padding: 40px;
        position: relative;
    }
    .print-wrapper { border: none; }
    .print-wrapper::before, .print-wrapper::after { display: none; }

    /* Force the card appearance in print */
    .mohu-card {
        background: #FFFFFF !important;
        color: #000000 !important;
        border: 2px solid #000 !important;
        box-shadow: none !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
        margin: 0 !important;
    }
    .mohu-card * { color: #000000 !important; }
    .mohu-card-bg-text { color: rgba(0,0,0,0.15) !important; }
    .mohu-qr { background: transparent !important; box-shadow: none !important; }
    .mohu-qr path { fill: #000000 !important; }
    
    .print-instructions {
        margin-top: 40px;
        font-family: 'Poppins', sans-serif;
        color: #333;
        text-align: center;
    }
}

/* --- LOADER --- */
#loader { position: fixed; inset: 0; z-index: 9999; background: var(--bg); display: flex; flex-direction: column; align-items: center; justify-content: center; transition: opacity 0.3s ease; }
#loader.hidden { opacity: 0; pointer-events: none; }
.spinner { width: 40px; height: 40px; border: 3px solid var(--surface-alt); border-top-color: var(--brand); border-radius: 50%; animation: spin 0.8s linear infinite; margin-bottom: 15px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* --- LIGHTBOX --- */
#lightbox { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.9); z-index: 2000; display: none; align-items: center; justify-content: center; backdrop-filter: blur(10px); }
#lightbox.visible { display: flex; animation: fadeIn 0.2s ease-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
#lightbox-img { max-width: 95%; max-height: 95%; border-radius: 4px; box-shadow: 0 0 20px rgba(0,0,0,0.5); object-fit: contain; }

/* --- HEADER --- */
#topbar { height: 54px; min-height: 54px; display: flex; justify-content: space-between; align-items: center; padding: 0 16px; background: var(--bg-glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); z-index: 100; transition: background 0.3s, border-color 0.3s; position: relative; }
.header-left { display: flex; align-items: center; gap: 10px; overflow: hidden; flex: 1; }
.header-right { display: flex; align-items: center; gap: 8px; }
.logo-btn { display: flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; padding: 6px 10px; border-radius: var(--radius-s); transition: var(--transition); }
.logo-btn:hover { background: var(--surface-alt); }
.logo-icon { width: 22px; height: 22px; }
.logo-text { font-weight: 800; font-size: 1.1rem; color: var(--brand); letter-spacing: -0.5px; }
.view-separator { width: 1px; height: 18px; background: var(--border); flex-shrink: 0; margin: 0 2px; }
.view-info-container { display: flex; align-items: baseline; gap: 6px; overflow: hidden; white-space: nowrap; color: var(--text); font-size: 0.9rem; }
.info-author { font-weight: 600; color: var(--brand); }
.info-title { font-weight: 500; }
.top-actions { display: flex; gap: 8px; align-items: center; }
#desktop-controls { display: flex; align-items: center; gap: 8px; }
#burger-btn { display: none; } /* Hidden by default */

/* Mobile Burger Menu */
#burger-menu-panel {
    position: fixed;
    top: 54px;
    right: 0;
    width: 250px;
    height: calc(100% - 54px);
    background: var(--surface);
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow-m);
    z-index: 99;
    transform: translateX(100%);
    transition: transform 0.3s ease-out;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
#burger-menu-panel.visible { transform: translateX(0); }
#mobile-controls-container { display: flex; flex-direction: column; gap: 8px; }
#mobile-controls-container .icon-btn { 
    width: 100%; 
    justify-content: flex-start;
    gap: 15px;
    padding: 12px;
    border-radius: var(--radius-s);
}
#mobile-controls-container .icon-btn::after {
    content: attr(title);
    font-size: 0.95rem;
    font-weight: 500;
}

/* --- SIDEBARS --- */
.sidebar { width: 320px; background: var(--bg-glass); backdrop-filter: blur(30px); -webkit-backdrop-filter: blur(30px); border-left: 1px solid var(--border); display: flex; flex-direction: column; z-index: 200; position: fixed; top: 0; right: 0; bottom: 0; transform: translateX(100%); transition: transform 0.35s cubic-bezier(0.19, 1, 0.22, 1); box-shadow: none; }
.sidebar.visible { transform: translateX(0); box-shadow: -10px 0 40px rgba(0,0,0,0.4); }
.sidebar-header { padding: 16px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.sidebar-header h3 { font-size: 0.95rem; font-weight: 700; color: var(--text); letter-spacing: 0.5px; text-transform: uppercase; }
.sidebar-content { flex: 1; overflow-y: auto; padding: 20px; }

/* PDF Mode in Settings: Hide irrelevant parts */
body.mode-pdf #sidebar-settings .setting-item-typography,
body.mode-pdf #sidebar-settings .settings-group:nth-child(2) {
    display: none !important;
}

/* --- TABS --- */
.sidebar-tabs { display: flex; border-bottom: 1px solid var(--border); }
.sidebar-tab { flex: 1; padding: 12px; text-align: center; cursor: pointer; font-size: 0.8rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; background: transparent; border: none; border-bottom: 2px solid transparent; }
.sidebar-tab.active { color: var(--brand); border-bottom-color: var(--brand); }
.sidebar-pane { display: none; } .sidebar-pane.active { display: block; }
.toc-link { display: block; padding: 12px 14px; color: var(--text-muted); text-decoration: none; border-radius: var(--radius-s); transition: 0.2s ease; font-size: 0.95rem; margin-bottom: 4px; border: 1px solid transparent; cursor: pointer; }
.toc-link:hover { background: var(--surface-alt); color: var(--brand); border-color: var(--border); transform: translateX(4px); }
.toc-link.active { color: var(--brand); background: var(--brand-dim); font-weight: 600; border-color: rgba(212, 175, 55, 0.2); }

/* --- VIEWS --- */
.view-section { display: none; width: 100%; height: calc(100% - 54px - 30px); overflow: hidden; position: relative; }
body.in-reader-mode .view-section { height: calc(100% - 54px); }
.view-section.active { display: block; }
#library-view { overflow-y: auto; padding: 30px 20px; }
#library-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 25px; max-width: 1200px; margin: 0 auto; padding-bottom: 80px; }

/* EMPTY LIBRARY STATE */
#library-grid.empty {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60vh;
}
#library-grid.empty .import-card {
    width: 300px;
    height: 400px;
}
#library-grid.empty .import-card .book-cover {
    height: 250px;
}

/* IMPORT CARD */
.import-card {
    background: transparent;
    border-radius: var(--radius-m);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 10px;
    opacity: 0.9;
}
.import-card:hover, .import-card.drag-active { transform: translateY(-5px); opacity: 1; }
.import-card .book-cover {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-alt);
    border: 2px dashed var(--border);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}
.import-card:hover .book-cover {
    border-color: var(--brand);
    box-shadow: 0 10px 30px var(--brand-dim);
}
.import-card.drag-active .book-cover {
    background: var(--brand-dim);
    border-color: var(--brand);
    border-style: solid;
}
.import-card .book-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0) 100%);
    pointer-events: none;
}

#reader-view.active { display: flex; width: 100%; position: relative; }
#reader-main { flex: 1; position: relative; overflow: hidden; height: 100%; display: flex; flex-direction: column; }
#viewer { 
    flex: 1; width: 100%; height: 100%; 
    overflow-y: auto; overflow-x: auto; 
    scroll-behavior: auto; position: relative; z-index: 10; 
    background-color: var(--bg);
    cursor: grab;
}
#viewer:active { cursor: grabbing; }

/* PDF Mode: Canvas style */
body.mode-pdf #viewer {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow: hidden;
    user-select: none;
}

#viewer-content { 
    width: 100%; margin: 0 auto; min-height: 80vh; 
    padding: 60px 20px 100px 20px; max-width: 100%; color: var(--text); 
    transform-origin: 0 0;
}

/* PDF Pages */
.pdf-page-container {
    display: block;
    margin: 10px auto;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    background: white;
    position: relative;
    overflow: hidden; 
    max-width: 100%; 
}
.pdf-page-container canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Floating PDF Controls */
#pdf-controls {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-glass);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 8px 16px;
    display: flex;
    gap: 12px;
    z-index: 500;
    box-shadow: var(--shadow-m);
    align-items: center;
}
.pdf-btn {
    background: transparent;
    border: none;
    color: var(--text);
    font-size: 1.1rem;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: 0.2s;
}
.pdf-btn:hover { background: var(--surface-alt); color: var(--brand); }
.pdf-sep { width: 1px; height: 20px; background: var(--border); }


.chapter-container { margin-bottom: 40px; }
.chapter-container * { max-width: 100% !important; box-sizing: border-box !important; color: inherit; background: transparent !important; }

/* Image Sizing Fix */
.chapter-container img, .chapter-container image, .chapter-container svg { 
    display: block !important; 
    margin: 10px auto !important; 
    border-radius: var(--radius-s) !important; 
    height: auto !important; 
    width: auto !important;
    max-width: 100% !important; 
    max-height: 90vh !important;
    object-fit: contain !important;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.chapter-container p { margin-bottom: 1.2em; line-height: inherit; }
.chapter-container h1, .chapter-container h2, .chapter-container h3 { margin-top: 1.5em; margin-bottom: 0.8em; color: var(--brand); }
.chapter-container a { color: var(--brand); text-decoration: none; border-bottom: 1px dotted var(--brand); cursor: pointer; }

/* --- COMPONENTS --- */
.btn { padding: 8px 16px; border-radius: var(--radius-m); border: 1px solid transparent; cursor: pointer; font-weight: 600; font-size: 0.9rem; transition: var(--transition); display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.btn-small { padding: 4px 10px; font-size: 0.8rem; }
.btn-primary { background-color: var(--brand); color: #000; border: none; }
body.theme-light .btn-primary, body.theme-sepia .btn-primary { color: #fff; }
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-secondary { background-color: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background-color: var(--surface-alt); }
.btn-danger { background-color: rgba(255, 69, 58, 0.15); color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:hover { background-color: var(--danger); color: white; }

.icon-btn { background: transparent; border: none; color: var(--text); cursor: pointer; padding: 8px; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: var(--transition); flex-shrink: 0; width: 40px; height: 40px; }
.icon-btn svg { width: 22px; height: 22px; }
.icon-btn:hover { background: var(--surface-alt); color: var(--brand); }
.icon-btn.active { color: var(--brand); background: var(--brand-dim); }

/* Improved Close Buttons */
.big-close { font-size: 1.5rem !important; width: 44px; height: 44px; transition: 0.2s ease; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
.big-close:hover { background-color: var(--brand); color: #000; transform: rotate(90deg); box-shadow: 0 2px 10px rgba(0,0,0,0.3); }

/* Book Card */
.book-card { background: transparent; border-radius: var(--radius-m); transition: var(--transition); cursor: pointer; position: relative; display: flex; flex-direction: column; gap: 10px; max-width: 100%; }
.book-card:hover { transform: translateY(-5px); }
.book-cover { width: 100%; aspect-ratio: 2/3; background: var(--surface-alt); border-radius: var(--radius-s); overflow: hidden; box-shadow: 0 4px 15px rgba(0,0,0,0.2); border: 1px solid var(--border); transition: var(--transition); position: relative; }
.book-card:hover .book-cover { box-shadow: 0 10px 30px var(--brand-dim); border-color: var(--brand); }
.book-cover img { width: 100%; height: 100%; object-fit: cover; }
.book-title { font-weight: 700; font-size: 0.95rem; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.book-author { font-size: 0.85rem; color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* --- MODALS --- */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(8px); z-index: 1000; display: none; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.2s; }
.modal.visible { display: flex; opacity: 1; pointer-events: auto; }
.modal-content { background: var(--surface); width: 90%; max-width: 900px; border-radius: var(--radius-l); padding: 0; border: 1px solid var(--border); max-height: 90vh; display: flex; flex-direction: column; box-shadow: 0 25px 50px rgba(0,0,0,0.5); overflow: hidden; color: var(--text); }
.drop-zone { border: 2px dashed var(--border); border-radius: var(--radius-m); padding: 40px; text-align: center; transition: 0.2s ease; }
.drop-zone.dragover, .drop-zone:hover { background: var(--surface-alt); border-color: var(--brand); }

/* Detail Modal */
.book-detail-layout { display: grid; grid-template-columns: 280px 1fr; height: 100%; overflow: hidden; }
.detail-left-col { background: var(--surface-alt); padding: 30px; display: flex; flex-direction: column; gap: 20px; border-right: 1px solid var(--border); align-items: center; text-align: center; }
.detail-right-col { padding: 30px 40px; overflow-y: auto; }
.book-detail-cover { width: 160px; aspect-ratio: 2/3; background: #000; border-radius: var(--radius-m); overflow: hidden; box-shadow: 0 8px 25px rgba(0,0,0,0.3); border: 1px solid var(--border); margin-bottom: 5px; flex-shrink: 0; }
.detail-actions { display: flex; flex-direction: column; gap: 8px; width: 100%; margin-top: auto; }
#toggle-desc-btn {
    display: none; /* Hide on desktop by default */
}
.detail-actions-extra { width: 100%; margin-top: 20px; }
.book-detail-cover img { width: 100%; height: 100%; object-fit: cover; }
.detail-meta h2 { font-size: 1.4rem; font-weight: 800; margin-bottom: 5px; line-height: 1.2; }
.detail-meta p { font-size: 1rem; color: var(--brand); font-weight: 600; }
.detail-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; }
.stat-box { background: rgba(128,128,128,0.1); padding: 8px; border-radius: var(--radius-s); text-align: center; }
.stat-val { display: block; font-size: 1.1rem; font-weight: 700; color: var(--text); }
.stat-lbl { font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
#detail-desc-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
}
#btn-back-from-desc {
    display: none;
    margin-bottom: 15px;
    width: fit-content;
    align-self: flex-start;
}
.book-desc { font-size: 1.05rem; line-height: 1.7; color: var(--text); opacity: 0.9; white-space: pre-wrap; flex-grow: 1; overflow-y: auto; }
.book-desc * { color: inherit !important; background: transparent !important; }

/* Settings */
.settings-group { margin-bottom: 25px; }
.settings-group h4 { color: var(--text-muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }
.setting-item { margin-bottom: 16px; }
/* Identify Typography items for hiding in PDF mode */
.setting-item.typography { display: block; }
.setting-item label { display: block; margin-bottom: 8px; font-size: 0.9rem; color: var(--text); }
.toggle-group { display: flex; background: var(--surface-alt); border-radius: var(--radius-s); padding: 3px; }
.toggle-btn { flex: 1; background: transparent; border: none; color: var(--text-muted); padding: 6px; font-size: 0.85rem; cursor: pointer; border-radius: 6px; transition: var(--transition); }
.toggle-btn.active { background: var(--bg); color: var(--text); box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.color-presets { display: flex; gap: 8px; margin-bottom: 10px; }
.color-preset-btn { width: 30px; height: 30px; border-radius: 50%; border: 2px solid var(--border); cursor: pointer; transition: transform 0.2s; }
.color-preset-btn:hover { transform: scale(1.1); border-color: #fff; }

input[type=range] { -webkit-appearance: none; width: 100%; background: transparent; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; height: 18px; width: 18px; border-radius: 50%; background: var(--text); cursor: pointer; margin-top: -7px; box-shadow: 0 2px 5px rgba(0,0,0,0.3); border: 2px solid var(--bg); }
input[type=range]::-webkit-slider-runnable-track { width: 100%; height: 4px; cursor: pointer; background: var(--border); border-radius: 2px; }
input[type=range]:focus::-webkit-slider-runnable-track { background: var(--brand); }

/* --- APPLE STYLE WIKI --- */
.apple-wiki { flex-direction: row !important; height: 80vh !important; max-height: 800px; max-width: 900px; }
.wiki-sidebar { width: 220px; background: var(--surface-alt); border-right: 1px solid var(--border); padding: 20px; display: flex; flex-direction: column; gap: 5px; flex-shrink: 0; }
.wiki-sidebar h3 { font-size: 0.8rem; text-transform: uppercase; color: var(--text-muted); margin-bottom: 10px; padding-left: 10px; }
.wiki-nav-btn { display: flex; align-items: center; gap: 10px; width: 100%; padding: 10px 12px; border: none; background: transparent; color: var(--text); border-radius: 8px; cursor: pointer; text-align: left; font-size: 0.95rem; font-weight: 500; transition: 0.2s; }
.wiki-nav-btn:hover { background: rgba(128,128,128,0.1); }
.wiki-nav-btn.active { background: var(--brand); color: #000; }
body.theme-terminal .wiki-nav-btn.active { color: #000; } 
.wiki-nav-select {
    display: none; /* Hide on desktop by default */
    width: 100%;
    padding: 12px;
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    font-size: 0.95rem;
    font-weight: 500;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%238E8E93' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    cursor: pointer;
}
.wiki-main-area { flex: 1; padding: 30px 40px; overflow-y: auto; }
.wiki-page { display: none; animation: fadeIn 0.3s ease; }
.wiki-page.active { display: block; }

.wiki-card { background: var(--surface-alt); border-radius: 12px; padding: 20px; margin-bottom: 15px; display: flex; gap: 15px; border: 1px solid var(--border); }
.wiki-icon { font-size: 2rem; background: var(--bg); width: 50px; height: 50px; display: flex; align-items: center; justify-content: center; border-radius: 10px; flex-shrink: 0; }
.wiki-text h4 { margin-bottom: 5px; color: var(--brand); }
.wiki-text p { font-size: 0.9rem; color: var(--text-muted); margin: 0; }

/* --- DONATE GRID --- */
.donate-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 30px; }
.donate-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.donate-card h3 { color: var(--text); }

/* QR Wrapper for Logo Overlay */
.qr-wrapper {
    position: relative;
    display: inline-block;
    padding: 10px;
    background: #fff;
    border-radius: 12px;
}
.qr-logo-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 36px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    border: 2px solid #fff;
    padding: 4px;
}


/* --- MOHU Card --- */
.mohu-print-area { background:var(--surface-alt); padding:20px; border-radius:12px; margin:20px 0; text-align:center; }
.mohu-card { 
    --card-bg: #FFFFFF; 
    --card-text: #000000; 
    background-color: var(--card-bg); 
    width: 85.6mm; height: 53.98mm; 
    border-radius: 3mm; padding: 10px; 
    display: flex; flex-direction: column; justify-content: space-between; 
    position: relative; box-shadow: 0 4px 15px rgba(0,0,0,0.1); 
    border: 1px solid #000; font-family: 'Poppins', sans-serif; 
    margin: 20px auto; overflow: hidden; 
}
.mohu-card-bg-text { 
    position: absolute; 
    top: 50%; left: 10%;
    transform: translate(0, -50%) rotate(-15deg);
    font-size: 5rem; font-weight: 900; 
    color: rgba(0,0,0,0.08); user-select: none; 
    letter-spacing: -2px; white-space: nowrap; pointer-events: none; 
}
.mohu-card-logo { display: flex; align-items: center; gap: 6px; color: var(--card-text); font-weight: 700; z-index: 1; letter-spacing: 0.5px; font-size: 0.9rem; }
.mohu-card-logo .logo-icon { width: 18px; height: 18px; fill: #000 !important; }
.mohu-qr { 
    width: 25mm; height: 25mm; 
    display: flex; align-items: center; justify-content: center; 
    position: absolute; 
    top: 50%;
    right: 8mm;
    transform: translateY(-50%);
    left: auto; bottom: auto;
    z-index: 2; 
}
.mohu-qr img { width: 100%; height: 100%; }

/* Floating Back Button */
#floating-back-btn-container { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 500; opacity: 0; pointer-events: none; transition: opacity 0.3s ease, transform 0.3s ease; }
#floating-back-btn-container.visible { opacity: 1; pointer-events: auto; transform: translateX(-50%) translateY(0); }
#floating-back-btn { box-shadow: 0 5px 15px rgba(0,0,0,0.3); backdrop-filter: blur(10px); }

/* Footer */
#app-footer { height: 30px; display: flex; justify-content: center; align-items: center; font-size: 0.75rem; color: var(--text-muted); background: var(--bg); border-top: 1px solid var(--border); flex-shrink: 0; }
body.in-reader-mode #app-footer {
    display: none;
}

/* Search Results Enhancements */
.search-result-item {
    background: var(--surface-alt);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: 0.2s;
    position: relative;
    overflow: hidden;
}
.search-result-item:hover {
    background: var(--surface);
    border: 1px solid var(--brand);
}
.search-result-item .search-actions {
    display: none;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    justify-content: flex-end;
}
.search-result-item:hover .search-actions {
    display: flex;
}

/* --- MOBILE OPTIMIZATION --- */
@media (max-width: 768px) {
    /* Adaptive Header */
    #desktop-controls { display: none; }
    #burger-btn { display: flex; }

    #viewer-content {
        /* Full width reading on mobile */
        padding-left: 15px !important;
        padding-right: 15px !important;
    }

    #library-grid {
        /* More compact library on mobile */
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 20px;
    }

    /* Book Detail Modal Mobile */
    .book-detail-layout { grid-template-columns: 1fr; }
    #toggle-desc-btn {
        display: inline-flex;
    }
    .detail-left-col { padding: 20px; border-right: none; border-bottom: 1px solid var(--border); }
    .book-detail-cover { width: 120px; }
    #detail-desc-wrapper { display: flex; } /* Changed for focused view */
    .detail-right-col { display: none; }

    .book-detail-layout.desc-focused .detail-left-col {
        display: none;
    }
    .book-detail-layout.desc-focused .detail-right-col {
        display: flex;
        flex-direction: column;
        padding: 20px;
        overflow-y: auto;
    }
     .book-detail-layout.desc-focused #btn-back-from-desc {
        display: inline-flex;
    }

    .detail-left-col {
        grid-template-columns: 120px 1fr;
        grid-template-rows: auto auto 1fr auto;
        display: grid;
        gap: 15px;
        text-align: left;
        align-items: flex-start;
    }
    .book-detail-cover { grid-row: 1 / span 4; }
    .detail-meta { grid-column: 2; grid-row: 1; }
    .detail-stats { grid-column: 2; grid-row: 2; width: 100%; }
    .detail-actions { grid-column: 2; grid-row: 3; align-self: start; width: 100%; margin-top: 0; }
    .detail-actions-extra { grid-column: 2; grid-row: 4; align-self: end; width: 100%; margin-top: 0; }


    .sidebar { width: 85%; }
    .view-info-container { font-size: 0.8rem; }
    .modal-content { width: 100%; height: 100%; max-width: 100%; max-height: 100%; border-radius: 0; border: none; }
    .big-close { width: 50px; height: 50px; font-size: 1.8rem; }
    
    /* Wiki Modal Mobile */
    .wiki-nav-container { display: none; }
    .wiki-nav-select { display: block; }
    .apple-wiki { flex-direction: column !important; }
    .wiki-sidebar { 
        width: 100%; 
        border-right: none; 
        border-bottom: 1px solid var(--border); 
        flex-direction: column;
        padding: 15px; 
        gap: 15px; 
    }
    .wiki-sidebar h3 { display: none; }
    .wiki-sidebar .modal-close { margin-top: 15px; }
    .wiki-main-area { padding: 20px; }
    .wiki-card { flex-direction: column; text-align: center; align-items: center; }
    
    .donate-grid { grid-template-columns: 1fr; }
}