/* PDF Viewer Section */
.pdf-section {
    margin-top: 1rem;
    animation: fadeInUp 0.6s ease-out 0.4s backwards;
}

/* PDF Viewer Layout */
.pdf-viewer-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    min-height: calc(100vh - 300px);
}

/* PDF Sidebar */
.pdf-sidebar {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.25rem;
    height: fit-content;
    position: sticky;
    top: 100px;
}

.pdf-sidebar-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1rem;
    padding-left: 0.25rem;
}

.pdf-list {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.pdf-list-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 450;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    width: 100%;
}

.pdf-list-item:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.pdf-list-item.active {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
}

.pdf-list-item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.6;
}

.pdf-list-item.active svg {
    opacity: 1;
}

.pdf-list-item-text {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* PDF Main Viewer */
.pdf-main {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* PDF Viewer Container */
.pdf-viewer-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.pdf-viewer-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1.25rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    gap: 1rem;
}

.pdf-toolbar-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
    min-width: 0;
}

.pdf-title {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pdf-toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
}

.pdf-toolbar-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.pdf-toolbar-hint svg {
    width: 14px;
    height: 14px;
}

.pdf-toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pdf-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 0.875rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pdf-action-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.pdf-action-btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.pdf-action-btn.icon-only {
    padding: 0.5rem;
}

.pdf-action-btn.icon-only span {
    display: none;
}

.pdf-action-btn.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.pdf-action-btn.primary:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
    color: white;
}

/* PDF Embed */
.pdf-embed-wrapper {
    position: relative;
    width: 100%;
    height: calc(100vh - 320px);
    min-height: 500px;
    background: var(--bg-tertiary);
}

.pdf-embed {
    width: 100%;
    height: 100%;
    border: none;
    background: var(--bg-tertiary);
}

/* Loading State */
.pdf-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    gap: 1rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
}

.pdf-loading.visible {
    opacity: 1;
    pointer-events: auto;
}

.pdf-loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.pdf-loading-text {
    font-size: 0.875rem;
}

/* Fullscreen mode */
.pdf-viewer-container.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    border-radius: 0;
    border: none;
}

.pdf-viewer-container.fullscreen .pdf-embed-wrapper {
    height: calc(100vh - 56px);
}

/* Responsive */
@media (max-width: 900px) {
    .pdf-viewer-layout {
        grid-template-columns: 1fr;
    }
    
    .pdf-sidebar {
        position: static;
        order: 2;
    }
    
    .pdf-main {
        order: 1;
    }
    
    .pdf-list {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .pdf-list-item {
        flex: 0 0 auto;
    }
}

@media (max-width: 640px) {
    .pdf-embed-wrapper {
        height: 400px;
        min-height: 400px;
    }
    
    .pdf-viewer-toolbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .pdf-toolbar-left {
        width: 100%;
    }
    
    .pdf-toolbar-right {
        width: 100%;
    }
    
    .pdf-action-btn {
        flex: 1;
        justify-content: center;
    }
    
    .pdf-toolbar-hint {
        display: none;
    }
}