/* ==========================================================================
   Utility Seva — Merge PDF Tool Stylesheet
   File: css/merge-pdf.css
   Matches Utility Seva design system, typography, dark/light themes,
   horizontal flexbox breadcrumbs, and exact 50/50 two-column layout.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Root Variables for PDF Tool (Rose / Crimson + Sky Blue Accents)
   -------------------------------------------------------------------------- */
:root {
  --pdf-accent: #e11d48;
  --pdf-accent-hover: #be123c;
  --pdf-accent-glow: rgba(225, 29, 72, 0.25);
  --pdf-accent-light: rgba(225, 29, 72, 0.1);

  --pdf-sky-border: #38bdf8;
  --pdf-sky-bg: rgba(224, 242, 254, 0.65);
  --pdf-sky-hover: rgba(186, 230, 253, 0.9);
  --pdf-sky-glow: rgba(56, 189, 248, 0.35);

  --card-radius: 12px;
  --card-radius-sm: 8px;
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="dark"],
html.dark {
  --pdf-accent: #fb7185;
  --pdf-accent-hover: #f43f5e;
  --pdf-accent-glow: rgba(251, 113, 133, 0.3);
  --pdf-accent-light: rgba(251, 113, 133, 0.15);

  --pdf-sky-border: #0284c7;
  --pdf-sky-bg: rgba(14, 165, 233, 0.08);
  --pdf-sky-hover: rgba(14, 165, 233, 0.16);
  --pdf-sky-glow: rgba(14, 165, 233, 0.25);
}

/* --------------------------------------------------------------------------
   Breadcrumb Navigation (Strictly Horizontal with Flexbox)
   -------------------------------------------------------------------------- */
.breadcrumb-nav-compact,
.tool-breadcrumbs {
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  flex-wrap: wrap;
  gap: 0.45rem;
  font-size: 0.8125rem;
  color: var(--text-secondary, #64748b);
  margin-top: 0.25rem;
  margin-bottom: 0.85rem;
  line-height: 1.4;
  list-style: none;
  padding: 0;
}

.breadcrumb-nav-compact ol,
.tool-breadcrumbs ol {
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb-nav-compact li,
.tool-breadcrumbs li {
  display: inline-flex !important;
  align-items: center !important;
  margin: 0;
  padding: 0;
}

.breadcrumb-nav-compact a,
.tool-breadcrumbs a {
  color: var(--text-secondary, #64748b);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color var(--transition-fast);
}

.breadcrumb-nav-compact a:hover,
.tool-breadcrumbs a:hover {
  color: var(--pdf-accent, #e11d48);
}

.breadcrumb-nav-compact .breadcrumb-sep,
.tool-breadcrumbs .breadcrumb-sep,
.bc-sep {
  color: var(--text-muted, #94a3b8);
  font-size: 0.75rem;
  user-select: none;
  opacity: 0.7;
  display: inline-flex;
  align-items: center;
}

.breadcrumb-nav-compact .breadcrumb-current,
.tool-breadcrumbs .breadcrumb-current,
.breadcrumb-current {
  color: var(--text-primary, #0f172a);
  font-weight: 600;
}

html[data-theme="dark"] .breadcrumb-nav-compact .breadcrumb-current,
html.dark .breadcrumb-nav-compact .breadcrumb-current,
html[data-theme="dark"] .tool-breadcrumbs .breadcrumb-current,
html.dark .tool-breadcrumbs .breadcrumb-current {
  color: #f8fafc;
}

/* --------------------------------------------------------------------------
   Stage Container & Exact 50/50 Two-Column Layout
   -------------------------------------------------------------------------- */
.merge-pdf-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  width: 100%;
  box-sizing: border-box;
  margin-top: 1rem;
  margin-bottom: 2rem;
}

.pdf-panel-col {
  min-width: 0;
  width: 100%;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

@media (max-width: 900px) {
  .merge-pdf-stage {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

/* --------------------------------------------------------------------------
   Privacy & Security Notice Pill
   -------------------------------------------------------------------------- */
.privacy-banner-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #059669;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  margin-bottom: 1rem;
  line-height: 1.4;
}

html[data-theme="dark"] .privacy-banner-pill,
html.dark .privacy-banner-pill {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.35);
  color: #34d399;
}

.privacy-banner-pill svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Left Panel: Upload & Selected PDF File List (50% Width)
   -------------------------------------------------------------------------- */
.pdf-upload-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 1.25rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
}

/* Dropzone (Sky Blue Themed) */
.pdf-dropzone {
  border: 2px dashed var(--pdf-sky-border);
  background: var(--pdf-sky-bg);
  border-radius: var(--card-radius-sm);
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  position: relative;
  box-sizing: border-box;
  width: 100%;
}

.pdf-dropzone:hover,
.pdf-dropzone.drag-over {
  background: var(--pdf-sky-hover);
  border-color: #0284c7;
  box-shadow: 0 0 0 4px var(--pdf-sky-glow);
  transform: translateY(-1px);
}

.pdf-upload-panel.has-files .pdf-dropzone {
  padding: 1rem 0.85rem;
  gap: 0.45rem;
}

.pdf-dropzone-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0284c7;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.15);
  transition: transform var(--transition-fast);
}

.pdf-upload-panel.has-files .pdf-dropzone-icon {
  width: 34px;
  height: 34px;
}

.pdf-dropzone:hover .pdf-dropzone-icon,
.pdf-dropzone.drag-over .pdf-dropzone-icon {
  transform: scale(1.1);
}

.pdf-dropzone-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.pdf-dropzone-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin: 0;
}

.pdf-dropzone-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.btn-select-pdf {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: #0284c7;
  color: #ffffff;
  border: none;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.15rem;
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.25);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-select-pdf:hover {
  background: #0369a1;
  transform: translateY(-1px);
}

/* Upload Action Controls (Add More, Clear All) */
.pdf-upload-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
}

.btn-panel-action {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.45rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-alt);
  color: var(--text-secondary);
}

.btn-panel-action:hover:not(:disabled) {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.btn-panel-action.btn-clear-danger:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.btn-panel-action:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* File List Container inside Left Panel */
.pdf-file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.pdf-file-list-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pdf-file-count-badge {
  background: var(--pdf-accent-light);
  color: var(--pdf-accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-family: 'JetBrains Mono', monospace;
}

.pdf-file-list-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Scrollable List Container (Internal scroll for long file lists) */
.pdf-file-scroll-area {
  max-height: 420px;
  overflow-y: auto;
  padding-right: 0.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color-hover) transparent;
}

.pdf-file-scroll-area::-webkit-scrollbar {
  width: 6px;
}

.pdf-file-scroll-area::-webkit-scrollbar-thumb {
  background-color: var(--border-color-hover);
  border-radius: 4px;
}

/* Individual File Card */
.pdf-file-card {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius-sm);
  padding: 0.55rem 0.7rem;
  transition: all var(--transition-fast);
  user-select: none;
  position: relative;
  box-sizing: border-box;
  width: 100%;
}

.pdf-file-card:hover {
  border-color: var(--border-color-hover);
  background: var(--bg-surface);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* Drag states */
.pdf-file-card.dragging {
  opacity: 0.4;
  border: 2px dashed var(--pdf-accent);
}

.pdf-file-card.drag-over-top {
  border-top: 2px solid var(--pdf-accent);
}

.pdf-file-card.drag-over-bottom {
  border-bottom: 2px solid var(--pdf-accent);
}

/* Card Drag Handle */
.pdf-card-drag-handle {
  cursor: grab;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  border-radius: 4px;
  transition: color var(--transition-fast);
}

.pdf-card-drag-handle:active {
  cursor: grabbing;
}

.pdf-card-drag-handle:hover {
  color: var(--text-primary);
}

.pdf-card-drag-handle svg {
  width: 18px;
  height: 18px;
}

/* Order Badge */
.pdf-card-order-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--pdf-accent-light);
  color: var(--pdf-accent);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  min-width: 28px;
  text-align: center;
}

/* Thumbnail Box */
.pdf-card-thumbnail {
  width: 40px;
  height: 52px;
  border-radius: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}

.pdf-card-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pdf-card-thumbnail-fallback {
  color: var(--pdf-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdf-card-thumbnail-fallback svg {
  width: 22px;
  height: 22px;
}

/* File Info Details */
.pdf-card-info {
  flex: 1;
  min-width: 0; /* Critical for ellipsis truncation inside flexbox */
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.pdf-card-filename {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
}

.pdf-card-metadata {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.pdf-card-meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.pdf-card-meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-muted);
}

/* Card Action Buttons */
.pdf-card-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

.btn-card-ctrl {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.35rem;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-card-ctrl:hover:not(:disabled) {
  background: var(--bg-surface);
  border-color: var(--border-color);
  color: var(--text-primary);
}

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

.btn-card-ctrl.btn-card-delete:hover:not(:disabled) {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.25);
  color: #ef4444;
}

.btn-card-ctrl svg {
  width: 15px;
  height: 15px;
}

/* --------------------------------------------------------------------------
   Right Panel: Empty State, Action Card, Progress, Success (50% Width)
   -------------------------------------------------------------------------- */
.pdf-right-panel {
  display: flex;
  flex-direction: column;
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
}

/* Action Card (When Files are Uploaded) */
.pdf-action-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 1.25rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  width: 100%;
  box-sizing: border-box;
  min-width: 0;
}

.pdf-action-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.pdf-action-card-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

/* Document Summary Widget */
.pdf-summary-widget {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius-sm);
  padding: 0.85rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  text-align: center;
  box-sizing: border-box;
}

.pdf-summary-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.pdf-summary-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  color: var(--text-muted);
}

.pdf-summary-value {
  font-size: 1rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary);
}

/* Output Filename Group */
.pdf-filename-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.pdf-field-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pdf-input-with-suffix {
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.pdf-input-with-suffix:focus-within {
  border-color: var(--pdf-accent);
  box-shadow: 0 0 0 3px var(--pdf-accent-glow);
}

.pdf-input-text {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.6rem 0.75rem;
  font-size: 0.875rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary);
  outline: none;
  min-width: 0;
}

.pdf-input-suffix {
  padding: 0.6rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-surface-alt);
  border-left: 1px solid var(--border-color);
}

/* Primary Merge Button */
.btn-primary-merge {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, #e11d48 0%, #be123c 100%);
  color: #ffffff;
  border: none;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.85rem 1.25rem;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--pdf-accent-glow);
  transition: all var(--transition-fast);
}

html[data-theme="dark"] .btn-primary-merge,
html.dark .btn-primary-merge {
  background: linear-gradient(135deg, #fb7185 0%, #e11d48 100%);
  color: #0f172a;
}

.btn-primary-merge:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--pdf-accent-glow);
  filter: brightness(1.05);
}

.btn-primary-merge:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary-merge:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
  filter: grayscale(0.5);
}

.btn-primary-merge svg {
  width: 20px;
  height: 20px;
}

/* Empty State Card */
.pdf-empty-state {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3.5rem 1.75rem;
  min-height: 400px;
  box-sizing: border-box;
}

.pdf-empty-illustration {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--pdf-accent-light);
  color: var(--pdf-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.pdf-empty-illustration svg {
  width: 36px;
  height: 36px;
}

.pdf-empty-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.4rem 0;
}

.pdf-empty-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 0 1.25rem 0;
  line-height: 1.5;
}

.pdf-empty-tips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  max-width: 500px;
}

.pdf-empty-tip-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.65rem;
  border-radius: 9999px;
  color: var(--text-muted);
}

.pdf-empty-tip-tag svg {
  width: 14px;
  height: 14px;
  color: var(--pdf-accent);
}

/* --------------------------------------------------------------------------
   In-Progress Processing Card
   -------------------------------------------------------------------------- */
.pdf-progress-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 3rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  min-height: 380px;
  box-sizing: border-box;
}

.pdf-progress-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--pdf-accent);
  border-radius: 50%;
  animation: pdfSpin 0.9s linear infinite;
}

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

.pdf-progress-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.pdf-progress-status {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

.pdf-progress-bar-track {
  width: 100%;
  max-width: 380px;
  height: 8px;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.pdf-progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #e11d48, #fb7185);
  border-radius: 9999px;
  transition: width 0.2s ease-out;
}

.pdf-progress-stats-row {
  display: flex;
  gap: 1.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

/* --------------------------------------------------------------------------
   Merge Complete / Output Card
   -------------------------------------------------------------------------- */
.pdf-success-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-sizing: border-box;
}

.pdf-success-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pdf-success-icon-badge {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pdf-success-icon-badge svg {
  width: 24px;
  height: 24px;
}

.pdf-success-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.pdf-success-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin: 0.15rem 0 0 0;
}

/* Result Stats Grid */
.pdf-result-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius-sm);
  padding: 1rem;
  box-sizing: border-box;
}

@media (max-width: 600px) {
  .pdf-result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.pdf-result-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.pdf-result-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.pdf-result-val {
  font-size: 1rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary);
}

/* Result Action Buttons */
.pdf-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: 0.5rem;
}

.btn-download-pdf {
  flex: 1;
  min-width: 200px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: #10b981;
  color: #ffffff;
  border: none;
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 3px 12px rgba(16, 185, 129, 0.25);
  transition: all var(--transition-fast);
}

.btn-download-pdf:hover {
  background: #059669;
  transform: translateY(-2px);
  box-shadow: 0 5px 16px rgba(16, 185, 129, 0.35);
}

.btn-preview-merged {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-preview-merged:hover {
  background: var(--bg-surface-alt);
  border-color: var(--border-color-hover);
}

.btn-merge-another {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: transparent;
  border: 1px dashed var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-merge-another:hover {
  border-color: var(--pdf-accent);
  color: var(--pdf-accent);
  background: var(--pdf-accent-light);
}

/* --------------------------------------------------------------------------
   Preview Modal Dialog
   -------------------------------------------------------------------------- */
.pdf-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.pdf-modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.pdf-modal-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  width: 100%;
  max-width: 840px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  transform: scale(0.95);
  transition: transform var(--transition-fast);
}

.pdf-modal-backdrop.active .pdf-modal-box {
  transform: scale(1);
}

/* Modal Header */
.pdf-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface-alt);
}

.pdf-modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.pdf-modal-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-close-modal:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}

/* Modal Toolbar */
.pdf-modal-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface);
  font-size: 0.8125rem;
}

.pdf-toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-tool-ctrl {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: all var(--transition-fast);
}

.btn-tool-ctrl:hover:not(:disabled) {
  background: var(--bg-surface);
  border-color: var(--border-color-hover);
}

.btn-tool-ctrl:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pdf-page-indicator {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0 0.35rem;
}

/* Modal Canvas Viewport */
.pdf-canvas-viewport {
  flex: 1;
  overflow: auto;
  padding: 1.25rem;
  background: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 420px;
  position: relative;
}

#previewPdfCanvas {
  max-width: 100%;
  height: auto;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
  background: #ffffff;
  border-radius: 2px;
}

.pdf-canvas-spinner {
  position: absolute;
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: pdfSpin 0.8s linear infinite;
}

/* --------------------------------------------------------------------------
   Toast Notification Styles
   -------------------------------------------------------------------------- */
.pdf-toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 10000;
  pointer-events: none;
}

.pdf-toast {
  pointer-events: auto;
  padding: 0.75rem 1.15rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  animation: toastSlideIn 0.25s ease-out;
  max-width: 380px;
}

@keyframes toastSlideIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.pdf-toast-success {
  background: #10b981;
  color: #ffffff;
}

.pdf-toast-error {
  background: #ef4444;
  color: #ffffff;
}

.pdf-toast-info {
  background: #0284c7;
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   Educational & SEO Guide Section
   -------------------------------------------------------------------------- */
.pdf-guide-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 2.5rem;
  box-sizing: border-box;
  width: 100%;
}

.pdf-guide-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.pdf-guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 860px) {
  .pdf-guide-grid {
    grid-template-columns: 1fr;
  }
}

.pdf-guide-card {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius-sm);
  padding: 1rem;
}

.pdf-guide-card h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.pdf-guide-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}