/* 
 * NULL // TOOLS - TOOL SPECIFIC LAYOUTS STYLESHEET
 * Image Background Remover Canvas, PDF Page Grid, PDF Visual Annotator & AI Tools
 */

/* PDF Thumbnail Organizer Grid */
.pdf-thumbnails-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  max-height: 550px;
  overflow-y: auto;
  padding: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
}

.pdf-thumb-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  user-select: none;
  transition: var(--transition-fast);
}

.pdf-thumb-card.selected {
  border-color: var(--text-main);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.25);
}

.pdf-thumb-card canvas, .pdf-thumb-card img {
  width: 100%;
  height: 180px;
  object-fit: contain;
  background: #ffffff;
  border-radius: 2px;
  margin-bottom: 8px;
}

.pdf-thumb-meta {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.pdf-thumb-actions {
  position: absolute;
  top: 6px;
  right: 6px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: var(--transition-fast);
}

.pdf-thumb-card:hover .pdf-thumb-actions {
  opacity: 1;
}

.btn-thumb-icon {
  background: rgba(0, 0, 0, 0.85);
  border: 1px solid var(--border-bright);
  color: #fff;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.btn-thumb-icon:hover {
  background: var(--accent-dot);
}

/* Image Studio & BG Removal Workspace */
.image-studio-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}

.studio-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.studio-canvas-wrapper {
  background: #000;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  /* Checkerboard pattern for transparency visualization */
  background-image: linear-gradient(45deg, #181818 25%, transparent 25%), 
                    linear-gradient(-45deg, #181818 25%, transparent 25%), 
                    linear-gradient(45deg, transparent 75%, #181818 75%), 
                    linear-gradient(-45deg, transparent 75%, #181818 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.studio-canvas-wrapper canvas {
  max-width: 100%;
  max-height: 520px;
  object-fit: contain;
  box-shadow: 0 10px 30px rgba(0,0,0,0.8);
}

/* Tool Brush Controls */
.brush-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.btn-brush-mode {
  flex: 1;
  padding: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  text-align: center;
}

.btn-brush-mode.active {
  background: var(--text-main);
  color: var(--bg-primary);
  border-color: var(--text-main);
  font-weight: 600;
}

/* PDF Visual Canvas Annotator */
.pdf-annotator-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.pdf-annotator-stage {
  position: relative;
  max-height: 550px;
  overflow: auto;
  display: flex;
  justify-content: center;
  background: #111;
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.annotation-layer {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: auto;
}

/* Side-by-Side Compare PDF Tool */
.compare-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.compare-box {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
}

.compare-box canvas {
  width: 100%;
  height: 400px;
  object-fit: contain;
  background: #fff;
}

/* AI Summarizer Output Box */
.ai-summary-output {
  background: var(--bg-primary);
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--accent-dot);
  border-radius: var(--radius-sm);
  padding: 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-main);
  white-space: pre-wrap;
}

.ai-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.ai-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-xs);
  padding: 12px;
  text-align: center;
}

.ai-stat-card .val {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
}

.ai-stat-card .lbl {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
}