/* ============================================================
   merge.css  —  MergePDF tool styles, isolated for PDF-Tools-TVTC
   @keyframes are global; every other selector is scoped to the
   Merge tab via a :where(#tab-merge) prefix (zero added specificity,
   works in all browsers since 2020 — no @scope dependency).
   ============================================================ */

/* --- Hoisted @keyframes (global by nature) --- */
@keyframes floatBubble1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-80px, 100px) scale(1.1); }
  66% { transform: translate(50px, -60px) scale(0.95); }
}

@keyframes floatBubble2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(100px, -80px) scale(1.15); }
}

@keyframes mrgLogoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes preloader-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes preloader-logo-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes preloader-loading-bar {
  0% { left: -45%; }
  50% { left: 100%; width: 55%; }
  100% { left: 100%; width: 25%; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spinSlow {
  from { transform: rotate(-90deg); }
  to { transform: rotate(270deg); }
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@keyframes successPop {
  0% { transform: scale(0); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes mrgToastIn {
  0% { transform: translateY(-20px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}

@keyframes mrgToastOut {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(-20px); opacity: 0; }
}

@keyframes mrgFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes mrgFadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- All Merge styles scoped to the Merge tab --- */
/* --- Merge styles: scoped to #tab-merge via :where() (no @scope; works in all 2020+ browsers) --- */
:where(#tab-merge) *,
:where(#tab-merge) *::before,
:where(#tab-merge) *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
:where(#tab-merge) html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
:where(#tab-merge) body {
  font-family: 'Tajawal', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
}
:where(#tab-merge) .bg-particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
:where(#tab-merge) .bg-particles::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(26, 156, 160, 0.08) 0%, transparent 70%);
  animation: floatBubble1 20s ease-in-out infinite;
}
:where(#tab-merge) .bg-particles::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(100, 115, 125, 0.06) 0%, transparent 70%);
  animation: floatBubble2 25s ease-in-out infinite;
}
:where(#tab-merge) .app-container {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
:where(#tab-merge) .app-header {
  text-align: center;
  padding: 32px 0 8px;
  animation: fadeInDown 0.6s ease-out;
}
:where(#tab-merge) .theme-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 100;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}
:where(#tab-merge) .theme-toggle:hover {
  border-color: var(--teal-400);
  box-shadow: var(--shadow-md), var(--shadow-glow-teal);
  transform: scale(1.1);
}
:where(#tab-merge) .theme-toggle:active {
  transform: scale(0.95);
}
:where(#tab-merge) .theme-icon {
  width: 20px;
  height: 20px;
  color: var(--teal-400);
  transition: all var(--transition-base);
  position: absolute;
}
:where(#tab-merge) .theme-icon-dark {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
:where(#tab-merge) .theme-icon-light {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}
[data-theme="light"] :where(#tab-merge) .theme-icon-dark {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}
[data-theme="light"] :where(#tab-merge) .theme-icon-light {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
[data-theme="light"] :where(#tab-merge) .bg-particles::before {
  background: radial-gradient(circle, rgba(26, 156, 160, 0.06) 0%, transparent 70%);
}
[data-theme="light"] :where(#tab-merge) .bg-particles::after {
  background: radial-gradient(circle, rgba(100, 115, 125, 0.04) 0%, transparent 70%);
}
[data-theme="light"] :where(#tab-merge) .card {
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
[data-theme="light"] :where(#tab-merge) .file-name-input:hover {
  background: rgba(0, 0, 0, 0.03);
}
[data-theme="light"] :where(#tab-merge) .file-name-input:focus {
  background: rgba(0, 0, 0, 0.04);
}
[data-theme="light"] :where(#tab-merge) .notes-textarea {
  background: rgba(0, 0, 0, 0.02);
}
[data-theme="light"] :where(#tab-merge) .notes-textarea:focus {
  background: rgba(0, 0, 0, 0.03);
}
[data-theme="light"] :where(#tab-merge) .size-input-wrapper input[type="number"]:focus {
  background: rgba(0, 0, 0, 0.03);
}
[data-theme="light"] :where(#tab-merge) .header-text h1 {
  background: linear-gradient(135deg, var(--teal-600), var(--gray-500));
  -webkit-background-clip: text;
  background-clip: text;
}
[data-theme="light"] :where(#tab-merge) .success-content h3 {
  background: linear-gradient(135deg, var(--teal-600), var(--gray-500));
  -webkit-background-clip: text;
  background-clip: text;
}
:where(#tab-merge) .header-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
:where(#tab-merge) .header-logo {
  width: 100px;
  height: 100px;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(26, 156, 160, 0.3));
  animation: mrgLogoFloat 4s ease-in-out infinite;
}
:where(#tab-merge) .header-text h1 {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--teal-400), var(--gray-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}
:where(#tab-merge) .header-text p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-top: 4px;
}
:where(#tab-merge) .header-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 4px;
}
:where(#tab-merge) .header-credit {
  font-size: 0.78rem;
  color: var(--gray-500);
  font-weight: 500;
  margin-top: 2px;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
:where(#tab-merge) .telegram-link {
  display: inline-flex;
  align-items: center;
  color: #229ED9;
  transition: all var(--transition-base);
}
:where(#tab-merge) .telegram-link:hover {
  color: #1a7fae;
  transform: scale(1.2);
}
:where(#tab-merge) .telegram-icon {
  width: 17px;
  height: 17px;
  fill: currentColor;
}
:where(#tab-merge) .header-privacy {
  font-size: 0.74rem;
  color: var(--teal-500);
  font-weight: 600;
  margin-top: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  opacity: 0.9;
}
[data-theme="light"] :where(#tab-merge) .header-privacy {
  color: var(--teal-600);
}
:where(#tab-merge) .privacy-icon {
  width: 12px;
  height: 12px;
  stroke: currentColor;
  stroke-width: 2.5;
  display: inline-block;
}
:where(#tab-merge) .app-preloader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), visibility 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  opacity: 1;
  visibility: visible;
}
:where(#tab-merge) .app-preloader.fade-out {
  opacity: 0;
  visibility: hidden;
}
:where(#tab-merge) .preloader-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 320px;
  padding: 24px;
}
:where(#tab-merge) .preloader-logo-container {
  position: relative;
  width: 110px;
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}
:where(#tab-merge) .preloader-logo {
  width: 75px;
  height: 75px;
  object-fit: contain;
  z-index: 2;
  filter: drop-shadow(0 4px 12px rgba(26, 156, 160, 0.25));
  animation: preloader-logo-pulse 2s ease-in-out infinite;
}
:where(#tab-merge) .preloader-ring {
  position: absolute;
  inset: 0;
  border: 3.5px solid rgba(26, 156, 160, 0.1);
  border-top-color: var(--teal-500);
  border-radius: 50%;
  animation: preloader-spin 1.1s cubic-bezier(0.5, 0.1, 0.4, 0.9) infinite;
  z-index: 1;
}
:where(#tab-merge) .preloader-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
:where(#tab-merge) .preloader-status {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 2px;
}
:where(#tab-merge) .preloader-progress-bar {
  width: 190px;
  height: 4px;
  background: rgba(26, 156, 160, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}
:where(#tab-merge) .preloader-progress-inner {
  position: absolute;
  height: 100%;
  width: 45%;
  background: linear-gradient(90deg, var(--teal-500), var(--teal-400));
  border-radius: var(--radius-full);
  animation: preloader-loading-bar 1.5s ease-in-out infinite;
}
:where(#tab-merge) .preloader-privacy-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 6px;
}
:where(#tab-merge) .version-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--teal-400);
  background: rgba(26, 156, 160, 0.1);
  border: 1px solid rgba(26, 156, 160, 0.25);
  border-radius: var(--radius-full);
  padding: 3px 12px;
  letter-spacing: 0.05em;
  margin-top: 4px;
}
:where(#tab-merge) .steps-indicator {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  padding: 8px 0;
  animation: fadeInDown 0.6s ease-out 0.15s both;
}
:where(#tab-merge) .step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  position: relative;
}
:where(#tab-merge) .step-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
}
:where(#tab-merge) .step-number {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition-base);
}
:where(#tab-merge) .step-check {
  position: absolute;
  width: 18px;
  height: 18px;
  fill: white;
  opacity: 0;
  transform: scale(0);
  transition: all var(--transition-spring);
}
:where(#tab-merge) .step-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--transition-base);
}
:where(#tab-merge) .step-line {
  width: 60px;
  height: 2px;
  background: var(--border-color);
  margin: 19px 8px 0 8px;
  transition: background var(--transition-slow);
  position: relative;
  overflow: hidden;
}
:where(#tab-merge) .step-line::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--teal-500), var(--gray-400));
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-slow);
}
:where(#tab-merge) .step.active .step-circle {
  background: linear-gradient(135deg, var(--teal-500), var(--teal-600));
  border-color: var(--teal-500);
  box-shadow: 0 0 20px rgba(26, 156, 160, 0.3);
}
:where(#tab-merge) .step.active .step-number {
  color: white;
}
:where(#tab-merge) .step.active .step-label {
  color: var(--teal-400);
}
:where(#tab-merge) .step.completed .step-circle {
  background: linear-gradient(135deg, var(--teal-500), var(--gray-400));
  border-color: var(--teal-400);
}
:where(#tab-merge) .step.completed .step-number {
  opacity: 0;
  transform: scale(0);
}
:where(#tab-merge) .step.completed .step-check {
  opacity: 1;
  transform: scale(1);
}
:where(#tab-merge) .step.completed .step-label {
  color: var(--text-secondary);
}
:where(#tab-merge) .step-line.completed::after {
  transform: scaleX(1);
}
:where(#tab-merge) .card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 28px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-base);
  animation: mrgFadeInUp 0.5s ease-out;
}
:where(#tab-merge) .card:hover {
  border-color: var(--border-hover);
}
:where(#tab-merge) .card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
:where(#tab-merge) .card-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.15), rgba(100, 115, 125, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
:where(#tab-merge) .card-icon svg {
  width: 22px;
  height: 22px;
  color: var(--teal-400);
}
:where(#tab-merge) .card-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}
:where(#tab-merge) .card-description {
  font-size: 0.85rem;
  color: var(--text-muted);
  width: 100%;
  margin-top: -8px;
  padding-right: 56px;
}
:where(#tab-merge) .drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
:where(#tab-merge) .drop-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.03), rgba(100, 115, 125, 0.02));
  transition: opacity var(--transition-base);
}
:where(#tab-merge) .drop-zone:hover,
:where(#tab-merge) .drop-zone.drag-over {
  border-color: var(--teal-400);
  background: rgba(26, 156, 160, 0.05);
  transform: scale(1.005);
}
:where(#tab-merge) .drop-zone.drag-over {
  border-color: var(--gray-400);
  box-shadow: var(--shadow-glow-teal), var(--shadow-glow-gray);
}
:where(#tab-merge) .drop-zone.drag-over .drop-icon {
  transform: scale(1.1) translateY(-4px);
  color: var(--gray-400);
}
:where(#tab-merge) .drop-zone-content {
  position: relative;
  z-index: 1;
}
:where(#tab-merge) .drop-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 16px;
  color: var(--teal-400);
  transition: all var(--transition-spring);
}
:where(#tab-merge) .drop-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
:where(#tab-merge) .drop-subtext {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
:where(#tab-merge) .drop-formats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
:where(#tab-merge) .format-badge {
  background: linear-gradient(135deg, var(--teal-500), var(--teal-600));
  color: white;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
}
:where(#tab-merge) .format-info {
  font-size: 0.8rem;
  color: var(--text-muted);
}
:where(#tab-merge) .file-counter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  margin-top: 16px;
  background: rgba(26, 156, 160, 0.06);
  border: 1px solid rgba(26, 156, 160, 0.12);
  border-radius: var(--radius-md);
  animation: mrgFadeIn 0.3s ease-out;
}
:where(#tab-merge) .counter-info {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--teal-400);
  font-weight: 600;
  font-size: 0.9rem;
}
:where(#tab-merge) .counter-info svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
:where(#tab-merge) .cover-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.08), rgba(100, 115, 125, 0.05));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}
:where(#tab-merge) .toggle-info {
  display: flex;
  align-items: center;
  gap: 14px;
}
:where(#tab-merge) .toggle-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: var(--radius-sm);
}
:where(#tab-merge) .toggle-title {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}
:where(#tab-merge) .toggle-desc {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}
:where(#tab-merge) .switch {
  position: relative;
  width: 48px;
  height: 26px;
  flex-shrink: 0;
  cursor: pointer;
}
:where(#tab-merge) .switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
:where(#tab-merge) .slider {
  position: absolute;
  inset: 0;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}
:where(#tab-merge) .slider::before {
  content: '';
  position: absolute;
  height: 20px;
  width: 20px;
  right: 3px;
  bottom: 2px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition-base);
}
:where(#tab-merge) .switch input:checked + .slider {
  background: linear-gradient(135deg, var(--teal-500), var(--teal-600));
  border-color: var(--teal-500);
}
:where(#tab-merge) .switch input:checked + .slider::before {
  background: white;
  transform: translateX(-22px);
}
:where(#tab-merge) .unit-name-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.06), rgba(100, 115, 125, 0.04));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  gap: 14px;
  flex-wrap: wrap;
}
:where(#tab-merge) .unit-name-section .toggle-info { flex-shrink: 0; }
:where(#tab-merge) .unit-name-input {
  flex: 1;
  min-width: 180px;
  font-family: 'Tajawal', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  outline: none;
  text-align: center;
  transition: all var(--transition-fast);
}
:where(#tab-merge) .unit-name-input:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-hover);
}
:where(#tab-merge) .unit-name-input:focus {
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--teal-400);
  box-shadow: 0 0 0 2px rgba(26, 156, 160, 0.15);
}
:where(#tab-merge) .unit-name-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}
:where(#tab-merge) .file-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 60px;
}
:where(#tab-merge) .file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: grab;
  user-select: none;
}
:where(#tab-merge) .file-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}
:where(#tab-merge) .file-item:active {
  cursor: grabbing;
}
:where(#tab-merge) .file-item.sortable-ghost {
  opacity: 0.4;
  background: rgba(26, 156, 160, 0.1);
  border-color: var(--teal-400);
}
:where(#tab-merge) .file-item.sortable-chosen {
  box-shadow: var(--shadow-lg), var(--shadow-glow-teal);
  border-color: var(--teal-400);
  transform: scale(1.02);
  z-index: 10;
}
:where(#tab-merge) .file-item.sortable-drag {
  opacity: 0.9;
  box-shadow: var(--shadow-lg);
}
:where(#tab-merge) .file-drag-handle {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 4px;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}
:where(#tab-merge) .file-drag-handle:hover {
  color: var(--teal-400);
}
:where(#tab-merge) .drag-dots {
  display: grid;
  grid-template-columns: repeat(2, 4px);
  gap: 3px;
}
:where(#tab-merge) .drag-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
}
:where(#tab-merge) .file-order {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--teal-500), var(--teal-600));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
}
:where(#tab-merge) .file-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(211, 47, 47, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
:where(#tab-merge) .file-icon svg {
  width: 20px;
  height: 20px;
  color: #ef5350;
}
:where(#tab-merge) .file-info {
  flex: 1;
  min-width: 0;
}
:where(#tab-merge) .file-name-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
:where(#tab-merge) .file-name-input {
  font-family: 'Tajawal', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 2px 8px;
  width: 100%;
  min-width: 0;
  outline: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}
:where(#tab-merge) .file-name-input:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-color);
}
:where(#tab-merge) .file-name-input:focus {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--teal-400);
  box-shadow: 0 0 0 2px rgba(26, 156, 160, 0.15);
  cursor: text;
}
:where(#tab-merge) .file-edit-icon {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  flex-shrink: 0;
  opacity: 0.5;
  transition: all var(--transition-fast);
  cursor: pointer;
}
:where(#tab-merge) .file-edit-icon:hover {
  color: var(--teal-400);
  opacity: 1 !important;
}
:where(#tab-merge) .file-item:hover .file-edit-icon {
  opacity: 0.8;
}
:where(#tab-merge) .file-name-input:focus ~ .file-edit-icon {
  opacity: 0;
}
:where(#tab-merge) .file-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
}
:where(#tab-merge) .file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
}
:where(#tab-merge) .file-pages {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}
:where(#tab-merge) .file-pages::before {
  content: '•';
  color: var(--text-muted);
}
:where(#tab-merge) .file-remove {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}
:where(#tab-merge) .file-remove:hover {
  background: var(--danger-bg);
  color: var(--danger-400);
}
:where(#tab-merge) .file-remove svg {
  width: 18px;
  height: 18px;
}
:where(#tab-merge) .cover-notes {
  margin-top: 20px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(100, 115, 125, 0.06), rgba(26, 156, 160, 0.04));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base);
}
:where(#tab-merge) .cover-notes:focus-within {
  border-color: var(--gray-400);
}
:where(#tab-merge) .notes-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
}
:where(#tab-merge) .notes-header svg {
  width: 18px;
  height: 18px;
  color: var(--gray-400);
  flex-shrink: 0;
}
:where(#tab-merge) .notes-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}
:where(#tab-merge) .notes-title-input {
  width: 100%;
  font-family: 'Tajawal', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  margin-bottom: 10px;
  outline: none;
  transition: all var(--transition-fast);
}
:where(#tab-merge) .notes-title-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.82rem;
}
:where(#tab-merge) .notes-title-input:focus {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--gray-400);
  box-shadow: 0 0 0 2px rgba(100, 115, 125, 0.12);
}
:where(#tab-merge) .notes-textarea {
  width: 100%;
  font-family: 'Tajawal', sans-serif;
  font-size: 0.9rem;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  resize: vertical;
  min-height: 60px;
  max-height: 200px;
  outline: none;
  transition: all var(--transition-fast);
  line-height: 1.7;
}
:where(#tab-merge) .notes-textarea::placeholder {
  color: var(--text-muted);
  font-size: 0.85rem;
}
:where(#tab-merge) .notes-textarea:focus {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--gray-400);
  box-shadow: 0 0 0 2px rgba(100, 115, 125, 0.12);
}

/* ── Cover Footer ── */
:where(#tab-merge) .footer-date-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
}
:where(#tab-merge) .footer-date-toggle input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: #1a9ca0;
  cursor: pointer;
  flex-shrink: 0;
}
:where(#tab-merge) .footer-date-options {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 10px;
  padding-right: 24px;
}
:where(#tab-merge) .footer-cal-radio {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.85rem;
}
:where(#tab-merge) .footer-cal-radio input[type="radio"] {
  width: 15px;
  height: 15px;
  accent-color: #1a9ca0;
  cursor: pointer;
}
:where(#tab-merge) .footer-cal-example {
  color: var(--text-muted);
  font-size: 0.78rem;
  /* direction is set per-calendar from JS (Hijri = rtl, Gregorian = ltr) */
  unicode-bidi: isolate;
}
:where(#tab-merge) .toggle-icon-compress {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.15), rgba(26, 156, 160, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
:where(#tab-merge) .toggle-icon-compress svg {
  width: 20px;
  height: 20px;
  color: var(--teal-400);
}
:where(#tab-merge) .compress-options {
  margin-top: 20px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.06), rgba(100, 115, 125, 0.04));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  animation: slideDown 0.3s ease-out;
}
:where(#tab-merge) .size-input-group {
  padding-top: 0;
}
:where(#tab-merge) .original-size-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: rgba(26, 156, 160, 0.05);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  margin-top: 18px;
  font-size: 0.95rem;
  transition: all var(--transition-base);
}
[data-theme="light"] :where(#tab-merge) .original-size-info {
  background: rgba(26, 156, 160, 0.02);
}
:where(#tab-merge) .original-size-label {
  font-weight: 600;
  color: var(--text-secondary);
}
:where(#tab-merge) .original-size-value {
  font-weight: 700;
  color: var(--teal-400);
}
:where(#tab-merge) .size-input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
:where(#tab-merge) .size-input-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
}
:where(#tab-merge) .size-input-wrapper input[type="number"] {
  font-family: 'Tajawal', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  width: 120px;
  outline: none;
  transition: all var(--transition-fast);
  text-align: center;
  -moz-appearance: textfield;
}
:where(#tab-merge) .size-input-wrapper input[type="number"]::-webkit-outer-spin-button,
:where(#tab-merge) .size-input-wrapper input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
:where(#tab-merge) .size-input-wrapper input[type="number"]:focus {
  border-color: var(--teal-400);
  box-shadow: 0 0 0 2px rgba(26, 156, 160, 0.15);
  background: rgba(255, 255, 255, 0.06);
}
:where(#tab-merge) .size-unit {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}
:where(#tab-merge) .compress-hint {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 14px;
  padding: 10px 14px;
  background: rgba(26, 156, 160, 0.05);
  border-radius: var(--radius-sm);
}
:where(#tab-merge) .compress-hint svg {
  width: 16px;
  height: 16px;
  color: var(--teal-400);
  flex-shrink: 0;
  margin-top: 2px;
}
:where(#tab-merge) .compress-hint span {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
}
:where(#tab-merge) .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: none;
  font-family: 'Tajawal', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
:where(#tab-merge) .btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
:where(#tab-merge) .btn:active {
  transform: scale(0.97);
}
:where(#tab-merge) .btn-sm {
  padding: 8px 16px;
  font-size: 0.8rem;
}
:where(#tab-merge) .btn-lg {
  padding: 14px 32px;
  font-size: 1rem;
}
:where(#tab-merge) .btn-primary {
  background: linear-gradient(135deg, var(--teal-500), var(--teal-600));
  color: white;
  box-shadow: 0 4px 15px rgba(26, 156, 160, 0.3);
}
:where(#tab-merge) .btn-primary:hover {
  background: linear-gradient(135deg, var(--teal-400), var(--teal-500));
  box-shadow: 0 6px 25px rgba(26, 156, 160, 0.4);
  transform: translateY(-1px);
}
:where(#tab-merge) .btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}
:where(#tab-merge) .btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
:where(#tab-merge) .btn-outline:hover {
  background: var(--bg-card);
  border-color: var(--border-hover);
  color: var(--text-primary);
}
:where(#tab-merge) .btn-ghost {
  background: transparent;
  color: var(--teal-400);
  padding: 8px 14px;
}
:where(#tab-merge) .btn-ghost:hover {
  background: rgba(26, 156, 160, 0.1);
}
:where(#tab-merge) .btn-danger {
  background: transparent;
  color: var(--danger-400);
  border: 1px solid rgba(211, 47, 47, 0.2);
}
:where(#tab-merge) .btn-danger:hover {
  background: var(--danger-bg);
  border-color: var(--danger-400);
}
:where(#tab-merge) .action-buttons {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  gap: 12px;
  flex-wrap: wrap;
}
:where(#tab-merge) .progress-section {
  text-align: center;
}
:where(#tab-merge) .progress-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
}
:where(#tab-merge) .progress-spinner {
  position: relative;
  width: 100px;
  height: 100px;
}
:where(#tab-merge) .progress-spinner svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
  animation: spinSlow 3s linear infinite;
}
:where(#tab-merge) .progress-percent {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--teal-400);
}
:where(#tab-merge) .progress-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}
:where(#tab-merge) .progress-detail {
  font-size: 0.85rem;
  color: var(--text-muted);
}
:where(#tab-merge) .progress-bar-container {
  width: 100%;
  max-width: 400px;
  height: 6px;
  background: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
}
:where(#tab-merge) .progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--teal-500), var(--gray-400));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  position: relative;
}
:where(#tab-merge) .progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  animation: shimmer 1.5s infinite;
}
:where(#tab-merge) .success-section {
  text-align: center;
}
:where(#tab-merge) .success-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
}
:where(#tab-merge) .success-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(26, 156, 160, 0.15), rgba(100, 115, 125, 0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  animation: successPop 0.5s var(--transition-spring) both;
}
:where(#tab-merge) .success-icon svg {
  width: 40px;
  height: 40px;
  color: var(--teal-400);
}
:where(#tab-merge) .success-content h3 {
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--teal-400), var(--gray-400));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
:where(#tab-merge) .success-detail {
  font-size: 0.9rem;
  color: var(--text-secondary);
}
:where(#tab-merge) .success-actions {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
:where(#tab-merge) .toast-container {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
:where(#tab-merge) .toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
  animation: mrgToastIn 0.4s var(--transition-spring) both;
  pointer-events: auto;
  min-width: 280px;
}
:where(#tab-merge) .toast.toast-out {
  animation: mrgToastOut 0.3s ease-in forwards;
}
:where(#tab-merge) .toast-error {
  border-color: var(--danger-400);
}
:where(#tab-merge) .toast-success {
  border-color: var(--teal-400);
}
:where(#tab-merge) .toast-warning {
  border-color: #ff9800;
}
:where(#tab-merge) .toast svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}
:where(#tab-merge) .toast-error svg { color: var(--danger-400); }
:where(#tab-merge) .toast-success svg { color: var(--teal-400); }
:where(#tab-merge) .toast-warning svg { color: #ff9800; }
:where(#tab-merge) .toast-message {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
}
:where(#tab-merge) .sister-tools {
  text-align: center;
  animation: fadeInDown 0.6s ease-out 0.3s both;
}
:where(#tab-merge) .sister-tool-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--teal-400);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
:where(#tab-merge) .sister-tool-link:hover {
  border-color: var(--teal-400);
  box-shadow: var(--shadow-glow-teal);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  color: var(--teal-300);
}
:where(#tab-merge) .sister-tool-icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
}
:where(#tab-merge) .app-footer {
  text-align: center;
  padding: 24px 0 16px;
  margin-top: auto;
  border-top: 1px solid var(--border-color);
}
:where(#tab-merge) .app-footer .footer-main {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 4px;
}
:where(#tab-merge) .app-footer .footer-credit {
  font-size: 0.75rem;
  color: var(--teal-400);
  font-weight: 500;
  margin-bottom: 8px;
  opacity: 0.85;
}
:where(#tab-merge) .app-footer .footer-copy {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: 2px;
}
:where(#tab-merge) .app-footer .footer-version {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 400;
  opacity: 0.6;
}
:where(#tab-merge) .hidden {
  display: none !important;
}
@media (max-width: 640px) {
:where(#tab-merge) .app-container {
    padding: 16px 14px 32px;
    gap: 16px;
  }
:where(#tab-merge) .card {
    padding: 20px 16px;
    border-radius: var(--radius-lg);
  }
:where(#tab-merge) .header-logo {
    width: 72px;
    height: 72px;
  }
:where(#tab-merge) .header-text h1 {
    font-size: 1.35rem;
  }
:where(#tab-merge) .drop-zone {
    padding: 32px 16px;
  }
:where(#tab-merge) .drop-icon {
    width: 60px;
    height: 60px;
  }
:where(#tab-merge) .step-line {
    width: 36px;
  }
:where(#tab-merge) .step-label {
    font-size: 0.65rem;
  }
:where(#tab-merge) .step-circle {
    width: 34px;
    height: 34px;
  }
:where(#tab-merge) .action-buttons {
    flex-direction: column-reverse;
  }
:where(#tab-merge) .action-buttons .btn {
    width: 100%;
    justify-content: center;
  }
:where(#tab-merge) .file-item {
    padding: 10px 12px;
    gap: 8px;
  }
:where(#tab-merge) .file-icon {
    display: none;
  }
:where(#tab-merge) .cover-toggle {
    flex-wrap: wrap;
    gap: 12px;
  }
}
:where(#tab-merge) .add-file-dashed {
  border: 2.5px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: center;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.01);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 14px;
}
:where(#tab-merge) .add-file-dashed:hover {
  border-color: var(--teal-400);
  background: rgba(26, 156, 160, 0.05);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-teal);
}
:where(#tab-merge) .add-file-dashed-content {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--teal-400);
  font-weight: 700;
  font-size: 0.92rem;
}
:where(#tab-merge) .add-plus-icon {
  width: 18px;
  height: 18px;
}
:where(#tab-merge) .cover-header {
  display: flex !important;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
}
:where(#tab-merge) .header-title-group {
  display: flex;
  align-items: center;
  gap: 14px;
}
:where(#tab-merge) .header-text-block h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}
:where(#tab-merge) .card-description-inline {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}
:where(#tab-merge) .cover-section:has(#coverSwitch:not(:checked)) .cover-body {
  display: none !important;
}
:where(#tab-merge) .cover-body {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  margin-top: 16px;
  align-items: start;
}
@media (max-width: 992px) {
:where(#tab-merge) .cover-body {
    grid-template-columns: 1fr;
    justify-items: center;
  }
:where(#tab-merge) .cover-preview-wrapper {
    width: 100%;
    max-width: 320px;
  }
}
:where(#tab-merge) .cover-inputs {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
}
:where(#tab-merge) .cover-preview-wrapper {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}
:where(#tab-merge) .preview-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  align-self: flex-start;
}
:where(#tab-merge) .cover-preview-sheet {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1 / 1.414;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), 0 12px 36px rgba(0, 0, 0, 0.12);
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  box-sizing: border-box;
  color: #2c3e50;
  overflow: hidden;
  direction: rtl;
  user-select: none;
}
:where(#tab-merge) .preview-top-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #1a9ca0;
}
:where(#tab-merge) .preview-bottom-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: #6b7078;
}
:where(#tab-merge) .preview-logo-container {
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
:where(#tab-merge) .preview-logo {
  height: 100%;
  object-fit: contain;
}
:where(#tab-merge) .preview-unit-name {
  font-size: 0.65rem;
  font-weight: 800;
  text-align: center;
  color: #3D4148;
  margin-bottom: 4px;
  line-height: 1.3;
}
:where(#tab-merge) .preview-cover-title {
  font-size: 0.55rem;
  font-weight: 500;
  text-align: center;
  color: #627380;
  margin-bottom: 12px;
  line-height: 1.3;
}
:where(#tab-merge) .preview-divider {
  border-top: 1px solid #6b7078;
  width: 100%;
  margin-bottom: 10px;
}
:where(#tab-merge) .preview-toc-title {
  font-size: 0.6rem;
  font-weight: 700;
  text-align: center;
  color: #1a9ca0;
  margin-bottom: 8px;
}
:where(#tab-merge) .preview-toc-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  flex: 0 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding-right: 2px;
}
/* Flexible region that fills the gap between the file list and the footer,
   centering the notes block vertically within it. */
:where(#tab-merge) .preview-middle {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
}
:where(#tab-merge) .preview-toc-list::-webkit-scrollbar {
  width: 3px;
}
:where(#tab-merge) .preview-toc-list::-webkit-scrollbar-track {
  background: transparent;
}
:where(#tab-merge) .preview-toc-list::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.15);
  border-radius: 3px;
}
:where(#tab-merge) .preview-toc-item {
  display: flex;
  align-items: center;
  font-size: 0.5rem;
  color: #333333;
  gap: 4px;
}
:where(#tab-merge) .preview-toc-num {
  width: 11px;
  height: 11px;
  background: #1a9ca0;
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.45rem;
  flex-shrink: 0;
}
:where(#tab-merge) .preview-toc-name {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 130px;
  /* Matches the clickable-link cue rendered onto the generated cover page. */
  color: #1a73c2;
  text-decoration: underline;
}
:where(#tab-merge) .preview-toc-dots {
  border-bottom: 1px dotted #cccccc;
  flex: 1;
}
:where(#tab-merge) .preview-notes-section {
  border-top: 1px solid #6b7078;
  border-bottom: 1px solid #6b7078;
  padding-top: 8px;
  padding-bottom: 8px;
  flex-shrink: 0;
  width: 100%;
}
:where(#tab-merge) .preview-notes-title {
  font-size: 0.55rem;
  font-weight: 700;
  color: #1a9ca0;
  text-align: center;
  margin-bottom: 4px;
}
:where(#tab-merge) .preview-notes-content {
  font-size: 0.48rem;
  color: #555555;
  text-align: center;
  line-height: 1.5;
  white-space: pre-wrap;
  max-height: 42px;
  overflow-y: auto;
}
:where(#tab-merge) .preview-footer-section {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 8px;
  width: 100%;
  margin-top: auto;
  padding-top: 6px;
  direction: rtl;
}
:where(#tab-merge) .preview-footer-text {
  font-size: 0.42rem;
  color: #6b7078;
  text-align: right;
  line-height: 1.4;
  white-space: pre-wrap;
  flex: 1;
}
:where(#tab-merge) .preview-footer-date {
  font-size: 0.42rem;
  color: #6b7078;
  /* direction is set per-calendar from JS (Hijri = rtl, Gregorian = ltr) */
  unicode-bidi: isolate;
  white-space: nowrap;
  flex-shrink: 0;
}
:where(#tab-merge) .title-with-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
:where(#tab-merge) .badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
}
:where(#tab-merge) .badge-info {
  background: rgba(100, 115, 125, 0.12);
  color: var(--text-secondary);
  border: 1px solid rgba(100, 115, 125, 0.2);
}