/* Professional PDF Comparison Workspace */

.compare-workspace {
    display: flex;
    width: 100%;
    min-height: calc(100vh - 80px);
    background: var(--black);
    position: relative;
    border-top: 1px solid var(--border);
}

.viewers-container {
    display: flex;
    flex: 1;
    gap: 15px;
    padding: 20px;
    background: var(--black-light);
    overflow: hidden;
    position: relative;
}

.pdf-viewer-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--black);
    border-radius: 16px;
    border: 1px solid var(--border);
    overflow: hidden;
    position: relative;
    max-height: calc(100vh - 120px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: var(--transition);
}

.pdf-viewer-pane:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.pane-header {
    padding: 15px 20px;
    background: var(--surface);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 5;
}

.pane-header h4 {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-main); /* High contrast */
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.pane-header .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: monospace;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.canvas-scroller {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    scroll-behavior: auto;
    background: #222; /* Fixed dark background for PDF contrast */
}

[data-theme="light"] .canvas-scroller {
    background: #f0f0f0;
}

/* Empty State */
.pane-empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--text-muted);
    gap: 20px;
    text-align: center;
    padding: 40px;
}

.pane-empty-state i {
    font-size: 3.5rem;
    opacity: 0.2;
}

/* Page styling for the canvas wrappers */
.page-wrapper {
    background: white;
    box-shadow: 0 10px 40px rgba(0,0,0,0.4);
    border-radius: 4px;
    padding: 0;
    line-height: 0;
    position: relative;
    transition: transform 0.2s ease;
}

/* Per-Viewer Zoom Toolbar */
.pane-zoom-bar {
    padding: 12px 20px;
    background: var(--surface);
    backdrop-filter: blur(15px);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    border-top: 1px solid var(--border);
    z-index: 5;
}

.zoom-btn {
    background: var(--surface-hover);
    border: 1px solid var(--border);
    color: var(--text-main);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.zoom-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.zoom-val {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    min-width: 50px;
    text-align: center;
}

/* Right Sidebar Styling */
#compare-sidebar {
    width: 400px;
    min-width: 400px;
    background: var(--black-light);
    border-left: 1px solid var(--border);
    padding: 0;
    height: calc(100vh - 80px);
    position: sticky;
    top: 80px;
    display: flex;
    flex-direction: column;
    z-index: 10;
    box-shadow: -10px 0 30px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 25px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h3 {
    margin: 0 0 20px 0;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.mode-selectors {
    display: flex;
    background: var(--surface);
    padding: 5px;
    border-radius: 12px;
    gap: 5px;
}

.mode-btn {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.mode-btn i {
    font-size: 1.1rem;
}

.mode-btn.active {
    background: var(--primary);
    color: white;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.search-container {
    position: relative;
}

.search-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.sidebar-search {
    width: 100%;
    padding: 12px 15px 12px 40px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-main);
    font-size: 0.9rem;
}

.change-report-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
}

/* Diff Block Styling */
.diff-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
    cursor: pointer;
    transition: transform 0.2s;
}

.diff-item:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.diff-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: 600;
}

.diff-block {
    font-size: 0.85rem;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 8px;
    position: relative;
    font-family: 'Inter', sans-serif;
}

.diff-block::before {
    position: absolute;
    right: 10px;
    top: 5px;
    font-size: 0.7rem;
    font-weight: 800;
    opacity: 0.5;
}

.diff-block.old {
    background: rgba(231, 76, 60, 0.1);
    border-left: 3px solid #e74c3c;
    color: #ff9999;
}
.diff-block.old::before { content: "OLD"; color: #e74c3c; }

.diff-block.new {
    background: rgba(46, 204, 113, 0.1);
    border-left: 3px solid #2ecc71;
    color: #99ffaa;
}
.diff-block.new::before { content: "NEW"; color: #2ecc71; }

.sidebar-footer {
    padding: 25px;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

/* About Section Styling */
.about-tool-section {
    padding: 80px 5%;
    background: var(--black-light);
    border-top: 1px solid var(--border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
}

.instruction-step {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
}

.step-num {
    background: var(--primary);
    color: white;
    width: 35px;
    height: 35px;
    min-width: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

/* Header Actions */
.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.action-icon {
    font-size: 1.1rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.action-icon:hover {
    color: var(--primary);
}

.action-icon.delete:hover {
    color: #e74c3c;
}

/* SEO Content Refinements - Compact Rectangular Layout */
.seo-content {
    padding: 80px 5% 120px;
}

.seo-content div[style*="border-radius: 20px"] {
    background: var(--surface) !important;
    backdrop-filter: blur(10px);
}

[data-theme="light"] .seo-content div[style*="border-radius: 20px"] {
    background: white !important;
    border-color: #eee !important;
}

[data-theme="dark"] .seo-content div[style*="border-radius: 20px"] {
    background: #0a0a0a !important;
    border-color: #222 !important;
}

/* Responsive Overrides */
@media (max-width: 1200px) {
    #compare-sidebar { width: 350px; min-width: 350px; }
}

@media (max-width: 900px) {
    .compare-workspace { flex-direction: column; }
    #compare-sidebar { width: 100%; min-width: 100%; height: auto; position: relative; top: 0; }
    .viewers-container { flex-direction: column; }
    .pdf-viewer-pane { max-height: 500px; }
    .about-card-refined { padding: 40px 30px; }
}