/* ==========================================================================
   TOOLVERSE TOOL-SPECIFIC STYLES
   ========================================================================== */

/* Tool Layout Wrapper */
.tool-container {
  max-width: 1000px;
  margin: 100px auto 40px auto;
  padding: 0 24px;
}

.tool-header-block {
  margin-bottom: 40px;
  text-align: center;
}

.tool-title-main {
  font-size: 36px;
  margin-bottom: 12px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tool-subtitle-main {
  font-size: 16px;
  color: var(--text-muted);
}

.tool-card-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  margin-bottom: 40px;
}

/* Draggable Thumbnail / Reordering (PDF tools) */
.thumbnail-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.thumbnail-card {
  position: relative;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: grab;
  user-select: none;
  transition: var(--transition-fast);
}

.thumbnail-card:active {
  cursor: grabbing;
}

.thumbnail-card.dragging {
  opacity: 0.5;
  border-color: var(--primary);
}

.thumbnail-image {
  width: 100%;
  aspect-ratio: 0.707; /* A4 aspect ratio */
  object-fit: contain;
  background: #000;
  border-radius: 4px;
}

.thumbnail-index {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}

.thumbnail-name {
  font-size: 11px;
  color: var(--text-muted);
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  width: 100%;
  text-align: center;
}

.thumbnail-delete {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: var(--error);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  transition: var(--transition-fast);
}

.thumbnail-delete:hover {
  background: var(--error);
  color: #fff;
}

/* Tool Tab Navs (JPG-to-PDF / Merge / Split) */
.tool-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
  overflow-x: auto;
}

.tool-tab {
  padding: 12px 24px;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.tool-tab:hover, .tool-tab.active {
  color: var(--primary);
}

.tool-tab.active {
  border-color: var(--primary);
}

/* Before / After Comparison Slider (Background Remover) */
.slider-container {
  position: relative;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  aspect-ratio: 4/3;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.slider-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.slider-img-foreground {
  z-index: 10;
  clip-path: polygon(0 0, 50% 0, 50% 100%, 0 100%);
}

.slider-img-background {
  z-index: 5;
  background-image: radial-gradient(circle, #ccc 10%, transparent 11%), radial-gradient(circle, #ccc 10%, transparent 11%);
  background-size: 16px 16px;
  background-position: 0 0, 8px 8px;
  background-color: #eee;
}

.slider-bar {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background: #fff;
  z-index: 20;
  transform: translateX(-50%);
  cursor: ew-resize;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
}

.slider-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--primary);
  z-index: 30;
  transform: translate(-50%, -50%);
  cursor: ew-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  box-shadow: var(--shadow-md);
  transition: transform 0.1s;
}

.slider-bar:hover + .slider-handle,
.slider-handle:hover {
  transform: translate(-50%, -50%) scale(1.1);
}

/* Control Grids */
.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* QR Code styling preview */
.qr-preview-box {
  background: #111827;
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}

/* Assignment Maker Layout & Controls */
.assignment-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 900px) {
  .assignment-layout {
    grid-template-columns: 1fr;
  }
}

.assignment-workspace {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.assignment-preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  background: #080c14;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  position: sticky;
  top: 96px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.assignment-canvas-wrapper {
  box-shadow: var(--shadow-lg);
  border-radius: 4px;
  overflow: hidden;
  max-width: 100%;
}

.assignment-canvas-wrapper canvas {
  display: block;
  max-width: 100%;
  height: auto;
  background: #fff;
}

.assignment-nav-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Color Pickers */
.color-picker-group {
  display: flex;
  gap: 8px;
}

.color-option {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition-fast);
}

.color-option.active {
  border-color: #fff;
  transform: scale(1.1);
}

/* Range Inputs */
.range-slider {
  width: 100%;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.1);
  height: 6px;
  border-radius: 3px;
  outline: none;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  transition: var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
  background: #22d3ee;
  transform: scale(1.2);
}

.range-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  text-align: right;
}