/* Premium PDF Viewer Styles */

:root {
    --pdf-bg: #0a0a0a;
    --pdf-toolbar-bg: rgba(20, 20, 20, 0.85);
    --pdf-toolbar-border: rgba(255, 255, 255, 0.1);
    --pdf-text: #ffffff;
    --pdf-text-muted: #aaaaaa;
    --pdf-accent: #d4af37; /* Archmod gold */
    --pdf-page-bg: #ffffff;
    --pdf-shadow-ambient: rgba(0, 0, 0, 0.3);
    --pdf-shadow-spine: rgba(0, 0, 0, 0.5);
    --pdf-radius: 4px;
    --pdf-z-index: 999999;
}

/* Base Overlay */
.pdf-viewer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--pdf-bg);
    z-index: var(--pdf-z-index);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    font-family: 'Inter', sans-serif;
    color: var(--pdf-text);
    overflow: hidden;
}

.pdf-viewer-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Toolbar */
.pdf-viewer-toolbar {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    background: var(--pdf-toolbar-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--pdf-toolbar-border);
    flex-shrink: 0;
    z-index: 10;
}

.pdf-toolbar-section {
    display: flex;
    align-items: center;
    gap: 16px;
}

.pdf-toolbar-section.center {
    flex: 1;
    justify-content: center;
}

.pdf-toolbar-section.right {
    justify-content: flex-end;
}

.pdf-toolbar-title {
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 250px;
}

.pdf-btn {
    background: transparent;
    border: none;
    color: var(--pdf-text-muted);
    font-size: 1rem;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--pdf-radius);
    transition: all 0.2s ease;
    font-family: inherit;
}

.pdf-btn:hover:not(:disabled) {
    color: var(--pdf-text);
    background: rgba(255, 255, 255, 0.05);
}

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

.pdf-page-indicator {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--pdf-text-muted);
    min-width: 80px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.pdf-zoom-indicator {
    font-size: 0.85rem;
    color: var(--pdf-text-muted);
    width: 50px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

/* Main Viewer Area */
.pdf-viewer-main {
    flex: 1;
    position: relative;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background: radial-gradient(circle at center, #1a1a1a 0%, #050505 100%);
}

/* Book Container */
.pdf-book-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.3s ease;
    perspective: 2000px; /* For potential 3D effects */
}

/* Book Spread (Desktop) */
.pdf-spread {
    display: flex;
    box-shadow: 
        0 25px 50px -12px var(--pdf-shadow-ambient),
        0 0 20px rgba(0,0,0,0.5);
    background-color: var(--pdf-page-bg);
    position: relative;
    border-radius: 2px;
}

/* Add a spine shadow */
.pdf-spread::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 40px;
    transform: translateX(-50%);
    background: linear-gradient(
        to right,
        rgba(0,0,0,0) 0%,
        rgba(0,0,0,0.05) 45%,
        rgba(0,0,0,0.15) 50%,
        rgba(0,0,0,0.05) 55%,
        rgba(0,0,0,0) 100%
    );
    pointer-events: none;
    z-index: 5;
}

/* Individual Pages */
.pdf-page-wrapper {
    position: relative;
    background-color: var(--pdf-page-bg);
    overflow: hidden;
}

.pdf-page-wrapper canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Add inner shadow for depth */
.pdf-page-left::after {
    content: '';
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: 20px;
    background: linear-gradient(to right, rgba(0,0,0,0), rgba(0,0,0,0.08));
    pointer-events: none;
}
.pdf-page-right::after {
    content: '';
    position: absolute;
    top: 0; left: 0; bottom: 0;
    width: 20px;
    background: linear-gradient(to left, rgba(0,0,0,0), rgba(0,0,0,0.08));
    pointer-events: none;
}

/* Page Transition Animation */
.pdf-book-container.animating {
    pointer-events: none;
}

.pdf-spread.fade-transition {
    animation: pdfFade 0.3s ease-in-out;
}

@keyframes pdfFade {
    0% { opacity: 0; transform: scale(0.98); }
    100% { opacity: 1; transform: scale(1); }
}

/* Loading State */
.pdf-loading-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--pdf-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 20;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.pdf-loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.pdf-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--pdf-accent);
    border-radius: 50%;
    animation: pdfSpin 1s linear infinite;
    margin-bottom: 20px;
}

.pdf-loading-text {
    font-size: 0.9rem;
    color: var(--pdf-text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}

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

/* Error State */
.pdf-error-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--pdf-bg);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 30;
}

.pdf-error-overlay.active {
    display: flex;
}

.pdf-error-text {
    font-size: 1.1rem;
    margin-bottom: 16px;
}

.pdf-error-btn {
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--pdf-accent);
    color: var(--pdf-accent);
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.pdf-error-btn:hover {
    background: var(--pdf-accent);
    color: #000;
}

/* Mobile Responsiveness */
@media (max-width: 900px) {
    .pdf-viewer-toolbar {
        padding: 0 12px;
    }
    
    .pdf-toolbar-title {
        display: none;
    }
    
    .pdf-zoom-indicator {
        display: none;
    }
    
    .pdf-btn.zoom-btn {
        display: none;
    }

    .pdf-viewer-main {
        padding: 10px;
    }

    .pdf-spread {
        flex-direction: column; /* Or just hide one page, handled in JS */
        box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }
    
    .pdf-spread::after {
        display: none; /* No spine on mobile single page */
    }
    
    .pdf-page-wrapper::after {
        display: none; /* No inner shadow */
    }
}