/* ==========================================================================
   PAPERCRAFT: Native Collaborative LaTeX Studio & Hub Styles
   ========================================================================== */

/* --- Hub Header & Filters --- */
.papercraft-hub-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  background: var(--bg-card);
  padding: 18px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.papercraft-hub-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.papercraft-hub-title h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.papercraft-hub-title .badge-tag {
  background: rgba(99, 102, 241, 0.15);
  color: #6366f1;
  border: 1px solid rgba(99, 102, 241, 0.3);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.papercraft-hub-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* --- Manuscripts Card Grid --- */
.papercraft-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}

.papercraft-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.papercraft-card:hover {
  transform: translateY(-3px);
  border-color: #6366f1;
  box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.1);
}

.papercraft-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
  gap: 12px;
}

.papercraft-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.badge-template {
  background: rgba(14, 165, 233, 0.12);
  color: #0284c7;
  border: 1px solid rgba(14, 165, 233, 0.25);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}

.badge-compile-success {
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.badge-compile-error {
  background: rgba(239, 68, 68, 0.12);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.badge-compile-pending {
  background: rgba(245, 158, 11, 0.12);
  color: #d97706;
  border: 1px solid rgba(245, 158, 11, 0.3);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}

.papercraft-card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.papercraft-card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.papercraft-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.papercraft-card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-papercraft-open {
  flex: 1;
  background: linear-gradient(135deg, #4f46e5, #6366f1);
  color: #ffffff !important;
  font-weight: 600;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
  transition: all 0.15s ease;
}

.btn-papercraft-open:hover {
  background: linear-gradient(135deg, #4338ca, #4f46e5);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
}

/* ==========================================================================
   PAPERCRAFT STUDIO (OVERLEAF-EQUIVALENT SIDE-BY-SIDE WORKSPACE)
   ========================================================================== */

#papercraft-studio-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 125px);
  min-height: 650px;
  background: var(--bg-body);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: 20px;
}

/* --- Top Studio Navigation Toolbar --- */
.papercraft-studio-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  gap: 12px;
  z-index: 10;
  flex-shrink: 0;
}

.studio-topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.studio-title-block {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.studio-manuscript-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 320px;
}

.studio-save-status {
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 5px;
}

.studio-save-status.unsaved {
  color: #d97706;
}

.studio-save-status.saved {
  color: #059669;
}

.studio-save-status.compiling {
  color: #6366f1;
}

.studio-topbar-center {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-recompile {
  background: linear-gradient(135deg, #059669, #10b981) !important;
  color: #ffffff !important;
  font-weight: 700;
  font-size: 13px;
  padding: 8px 18px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
  transition: all 0.15s ease;
}

.btn-recompile:hover {
  background: linear-gradient(135deg, #047857, #059669) !important;
  transform: translateY(-1px);
}

.btn-recompile.is-compiling {
  opacity: 0.8;
  pointer-events: none;
}

.btn-recompile kbd {
  background: rgba(0, 0, 0, 0.25);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 10px;
  font-family: var(--font-mono);
}

.studio-topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* --- Studio 3-Pane Body --- */
.papercraft-studio-body {
  display: flex;
  flex: 1;
  min-height: 0;
  position: relative;
  background: var(--bg-card);
}

/* --- 1. Left Sidebar: File Tree --- */
.papercraft-explorer-pane {
  width: 240px;
  min-width: 180px;
  max-width: 380px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.explorer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}

.explorer-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.explorer-icon-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 12px;
  transition: background 0.15s;
}

.explorer-icon-btn:hover {
  background: var(--border);
  color: var(--text-main);
}

.explorer-tree-content {
  flex: 1;
  overflow-y: auto;
  padding: 8px 6px;
}

.tree-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.12s;
  user-select: none;
  position: relative;
}

.tree-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

.tree-item.active {
  background: rgba(99, 102, 241, 0.12);
  color: #6366f1;
  font-weight: 600;
}

.tree-item.main-doc::after {
  content: 'MAIN';
  font-size: 9px;
  background: #6366f1;
  color: white;
  padding: 1px 4px;
  border-radius: 3px;
  margin-left: auto;
  font-weight: 700;
}

.tree-item .tree-icon {
  font-size: 14px;
  flex-shrink: 0;
}

.tree-item .tree-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.tree-item-actions {
  opacity: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  transition: opacity 0.12s;
}

.tree-item:hover .tree-item-actions {
  opacity: 1;
}

/* --- 2. Center Pane: Code Editor --- */
.papercraft-editor-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 320px;
  position: relative;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
}

.editor-tabs-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  padding: 0 6px 0 8px;
  flex-shrink: 0;
  height: 38px;
  gap: 8px;
  overflow: visible;
}

.editor-tabs-list {
  display: flex;
  align-items: center;
  overflow-x: auto;
  flex: 1;
  min-width: 0;
  height: 100%;
}

.editor-mode-switch-group {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-card);
  padding: 2px;
  border-radius: 6px;
  border: 1px solid var(--border);
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.mode-switch-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  font-size: 11.5px;
  font-weight: 500;
  border-radius: 4px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.mode-switch-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

.mode-switch-btn.active {
  background: rgba(99, 102, 241, 0.12);
  color: #6366f1;
  font-weight: 600;
}

#btn-mode-grammarly.active {
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
}

.g-pill-dot {
  color: #10b981;
  font-size: 9px;
  line-height: 1;
  animation: pulse-g-dot 2s infinite ease-in-out;
}

@keyframes pulse-g-dot {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.15); }
}

.editor-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 12px;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  background: transparent;
  border-right: 1px solid var(--border);
  user-select: none;
}

.editor-tab.active {
  background: var(--bg-card);
  color: var(--text-main);
  border-bottom-color: #6366f1;
  font-weight: 600;
}

.editor-tab .tab-close {
  opacity: 0.6;
  font-size: 11px;
  padding: 2px;
  border-radius: 50%;
}

.editor-tab .tab-close:hover {
  opacity: 1;
  background: rgba(239, 68, 68, 0.2);
  color: #ef4444;
}

#papercraft-ace-editor {
  flex: 1;
  width: 100%;
  height: 100%;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 13.5px;
}

.editor-statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 14px;
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.statusbar-left, .statusbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* --- 3. Right Pane: Live PDF Preview & Compiler Log --- */
.papercraft-preview-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 320px;
  background: #525659;
  position: relative;
}

.preview-top-tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  padding: 0 12px;
  height: 38px;
  flex-shrink: 0;
}

.preview-tab-buttons {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 100%;
}

.preview-tab-btn {
  background: transparent;
  border: none;
  height: 100%;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  display: flex;
  align-items: center;
  gap: 6px;
}

.preview-tab-btn.active {
  color: var(--text-main);
  border-bottom-color: #6366f1;
}

.preview-tab-badge {
  background: #ef4444;
  color: white;
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 700;
}

.preview-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.preview-frame-container {
  flex: 1;
  width: 100%;
  height: 100%;
  position: relative;
  background: #333;
}

#papercraft-pdf-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: #525659;
}

/* --- Log & Diagnostics Panel --- */
.preview-log-container {
  flex: 1;
  background: var(--bg-card);
  overflow-y: auto;
  padding: 16px;
  display: none;
  flex-direction: column;
  gap: 14px;
}

.preview-log-container.active {
  display: flex;
}

.log-summary-box {
  padding: 12px 16px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
}

.log-summary-box.success {
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.log-summary-box.error {
  background: rgba(239, 68, 68, 0.12);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.log-item-card {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  font-size: 12px;
}

.log-item-card.error {
  border-left: 3px solid #ef4444;
}

.log-item-card.warning {
  border-left: 3px solid #f59e0b;
}

.log-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
  font-weight: 600;
}

.log-jump-btn {
  background: rgba(99, 102, 241, 0.12);
  color: #6366f1;
  border: none;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
  font-weight: 600;
}

.log-raw-box {
  background: #0f172a;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 12px;
  border-radius: 6px;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
}

/* --- SyncTeX Overlay Floating Button --- */
.synctex-jump-indicator {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  cursor: pointer;
  transition: all 0.2s;
}

.synctex-jump-indicator:hover {
  background: #6366f1;
  border-color: #818cf8;
}

/* --- Version History Checkpoints Panel --- */
.checkpoint-timeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 480px;
  overflow-y: auto;
  padding-right: 6px;
}

.checkpoint-entry {
  display: flex;
  gap: 14px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  align-items: center;
  justify-content: space-between;
}

.checkpoint-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.checkpoint-message {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

.checkpoint-sub {
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  gap: 10px;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  #papercraft-studio-container {
    height: calc(100vh - 80px);
  }
  .papercraft-explorer-pane {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 20;
    box-shadow: var(--shadow-lg);
    display: none;
  }
  .papercraft-explorer-pane.mobile-open {
    display: flex;
  }
  .papercraft-studio-body {
    flex-direction: column;
  }
}

/* ==========================================================================
   PHASE 1 ADDITIONS: Engine Switcher, Math Palette, Comments & Visual Diff
   ========================================================================== */

/* 1. Compiler Engine Dropdown */
.engine-selector-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
}

.engine-select {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 12px;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  padding: 0 4px;
}

/* 2. Math Symbol & Macros Palette Drawer */
.papercraft-math-drawer {
  position: absolute;
  left: 240px;
  top: 0;
  bottom: 0;
  width: 290px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  z-index: 40;
  display: none;
  flex-direction: column;
}

.papercraft-math-drawer.open {
  display: flex;
}

.math-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 700;
  color: var(--text-main);
}

.math-tabs-bar {
  display: flex;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
}

.math-tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 8px 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  text-align: center;
}

.math-tab-btn.active {
  color: #6366f1;
  border-bottom-color: #6366f1;
  background: var(--bg-card);
}

.math-palette-content {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.math-symbol-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.math-sym-btn {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 2px;
  text-align: center;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.12s;
  color: var(--text-main);
  user-select: none;
}

.math-sym-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: #6366f1;
  color: #6366f1;
  transform: scale(1.06);
}

.math-macro-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.math-macro-item {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  transition: all 0.12s;
}

.math-macro-item:hover {
  background: var(--bg-card-hover);
  color: #6366f1;
  border-color: #6366f1;
}

/* 3. Review Comments Drawer */
.papercraft-comments-drawer {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 320px;
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  display: none;
  flex-direction: column;
}

.papercraft-comments-drawer.open {
  display: flex;
}

.comments-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

.comments-drawer-content {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
}

.comment-card {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
  position: relative;
  transition: all 0.15s;
}

.comment-card.resolved {
  opacity: 0.65;
  background: rgba(16, 185, 129, 0.05);
  border-color: rgba(16, 185, 129, 0.3);
}

.comment-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.comment-author-name {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-main);
}

.comment-line-badge {
  font-size: 10px;
  background: rgba(99, 102, 241, 0.12);
  color: #6366f1;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
}

.comment-quote-box {
  border-left: 3px solid #6366f1;
  padding-left: 8px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.comment-body-text {
  font-size: 12.5px;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 10px;
}

.comment-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 6px;
}

/* 4. Visual Version Diff Viewer */
.diff-modal-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 520px;
}

.diff-stat-summary {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-muted);
  white-space: pre-wrap;
}

.diff-content-view {
  background: #0f172a;
  color: #f8fafc;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 12px;
  line-height: 1.55;
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
  max-height: 420px;
  overflow-y: auto;
}

.diff-row {
  white-space: pre;
  padding: 1px 4px;
  border-radius: 2px;
}

.diff-row.add {
  background: rgba(16, 185, 129, 0.25);
  color: #34d399;
}

.diff-row.del {
  background: rgba(239, 68, 68, 0.25);
  color: #f87171;
}

.diff-row.hunk {
  background: rgba(99, 102, 241, 0.25);
  color: #a5b4fc;
  font-weight: 700;
}

/* ==========================================================================
   PHASE 2: COLLABORATOR PRESENCE, REVERSE SYNCTEX & GITHUB SYNC
   ========================================================================== */

/* 1. Real-Time Collaborator Presence Pills */
.studio-presence-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 12px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

.presence-empty-hint {
  font-size: 11px;
  color: var(--text-dim);
  font-weight: 600;
}

.presence-avatar-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  color: #059669;
  cursor: default;
  transition: all 0.2s ease;
  position: relative;
}

.presence-avatar-pill.other {
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.3);
  color: #4f46e5;
}

.presence-dot {
  width: 7px;
  height: 7px;
  background: #10b981;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.8);
  animation: presencePulse 2s infinite;
}

.presence-avatar-pill.other .presence-dot {
  background: #6366f1;
  box-shadow: 0 0 6px rgba(99, 102, 241, 0.8);
}

@keyframes presencePulse {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}

/* 2. Reverse SyncTeX Overlay & Target Pin */
.preview-tool-btn {
  background: rgba(99, 102, 241, 0.1);
  color: #4f46e5;
  border: 1px solid rgba(99, 102, 241, 0.25);
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 5px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.18s ease;
}

.preview-tool-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: #4f46e5;
}

.preview-tool-btn.active {
  background: #4f46e5;
  color: white;
  border-color: #4f46e5;
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.preview-frame-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.synctex-crosshair-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(99, 102, 241, 0.06);
  cursor: crosshair !important;
  z-index: 50;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  padding-top: 14px;
}

.synctex-crosshair-hint {
  background: rgba(15, 23, 42, 0.92);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
  pointer-events: auto;
  border: 1px solid rgba(255, 255, 255, 0.15);
  animation: fadeInDown 0.25s ease-out;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.synctex-hint-close {
  background: rgba(255, 255, 255, 0.18);
  border: none;
  color: white;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  cursor: pointer;
  font-weight: 600;
}

.synctex-hint-close:hover {
  background: rgba(239, 68, 68, 0.8);
}

.synctex-click-marker {
  position: absolute;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid #6366f1;
  background: rgba(99, 102, 241, 0.3);
  transform: translate(-50%, -50%);
  pointer-events: none;
  animation: synctexRipple 0.8s ease-out forwards;
}

@keyframes synctexRipple {
  0% { transform: translate(-50%, -50%) scale(0.4); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(2.2); opacity: 0; }
}

/* Ace Editor Highlight Flash for SyncTeX jump */
.ace-highlight-synctex {
  position: absolute;
  background: rgba(99, 102, 241, 0.3) !important;
  border-left: 4px solid #6366f1 !important;
  z-index: 20;
}

/* 3. GitHub Remote Sync Styles */
.github-status-card {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.github-sync-console {
  background: #0f172a;
  color: #38bdf8;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 11.5px;
  line-height: 1.5;
  border-radius: 6px;
  padding: 10px 12px;
  min-height: 70px;
  max-height: 150px;
  overflow-y: auto;
  white-space: pre-wrap;
  border: 1px solid rgba(255, 255, 255, 0.08);
}



/* ==========================================================================
   PHASE 3: LAYOUT SELECTOR, RESIZABLE SPLITTER, FULLSCREEN & LIGHT THEME
   ========================================================================== */

/* Overleaf View Mode Selector */
.view-mode-selector-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-sidebar);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.layout-select {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 12px;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  padding: 3px 4px;
}

.layout-select option {
  background: var(--bg-card);
  color: var(--text-main);
}

/* Fullscreen Studio Mode */
#papercraft-studio-container.fullscreen {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  min-height: 100vh !important;
  margin: 0 !important;
  border-radius: 0 !important;
  z-index: 99999 !important;
  border: none !important;
}

/* Draggable Splitter Resizer */
.papercraft-split-resizer {
  width: 7px;
  cursor: col-resize;
  background: var(--border);
  transition: background 0.15s ease;
  position: relative;
  z-index: 20;
  flex-shrink: 0;
  user-select: none;
  touch-action: none;
}

.papercraft-split-resizer:hover,
.papercraft-split-resizer.resizing {
  background: #6366f1;
}

.papercraft-split-resizer::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 3px;
  height: 26px;
  background: rgba(255, 255, 255, 0.4);
  border-radius: 2px;
}

/* Light Theme Overrides for Ace Editor and Studio Panels */
#papercraft-studio-container.theme-light .papercraft-editor-pane {
  background: #ffffff !important;
  border-right-color: #e5e7eb !important;
}

#papercraft-studio-container.theme-light #papercraft-ace-editor {
  background: #ffffff !important;
  color: #1f2937 !important;
}

#papercraft-studio-container.theme-light .editor-statusbar {
  background: #f8fafc !important;
  color: #475569 !important;
  border-top: 1px solid #e2e8f0 !important;
}

#papercraft-studio-container.theme-light .editor-tabs-bar {
  background: #f1f5f9 !important;
  border-bottom: 1px solid #e2e8f0 !important;
}

#papercraft-studio-container.theme-light .editor-tab {
  color: #64748b !important;
  border-right-color: #e2e8f0 !important;
}

#papercraft-studio-container.theme-light .editor-tab.active {
  background: #ffffff !important;
  color: #0f172a !important;
  border-bottom-color: #6366f1 !important;
}


/* ==========================================================================
   PHASE 5: MODERN OVERLEAF GUI, MENU SIDEBAR & COLLAPSIBLE FILE EXPLORER
   ========================================================================== */

/* Modern Top Navigation Bar */
.papercraft-studio-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  height: 48px;
  background: #181b20 !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
  gap: 12px;
  z-index: 50;
  flex-shrink: 0;
}

#papercraft-studio-container.theme-light .papercraft-studio-topbar {
  background: #f8fafc !important;
  border-bottom: 1px solid #e2e8f0 !important;
}

/* Overleaf-Style Menu Button */
.btn-overleaf-menu {
  background: #2b303c;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  padding: 6px 13px;
  font-size: 12.5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  letter-spacing: 0.2px;
}

.btn-overleaf-menu:hover {
  background: #3b4252;
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

#papercraft-studio-container.theme-light .btn-overleaf-menu {
  background: #0f172a;
  color: #ffffff;
  border-color: #0f172a;
}

/* Toggle Files Sidebar Button */
.btn-toggle-files {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-toggle-files:hover {
  background: var(--bg-card-hover);
  border-color: #6366f1;
}

.btn-toggle-files.inactive {
  opacity: 0.6;
  border-style: dashed;
}

/* Quick Save Button */
.btn-quick-save {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 11px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
}

.btn-quick-save:hover {
  background: var(--bg-card-hover);
  border-color: #6366f1;
}

/* Segmented View Control (Overleaf Style) */
.overleaf-segmented-group {
  display: inline-flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.35);
  padding: 2px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

#papercraft-studio-container.theme-light .overleaf-segmented-group {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

.segmented-item {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.12s ease;
  user-select: none;
}

.segmented-item:hover {
  color: var(--text-main);
}

.segmented-item.active {
  background: #6366f1;
  color: #ffffff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}

#papercraft-studio-container.theme-light .segmented-item.active {
  background: #4f46e5;
  color: #ffffff;
}

/* File Explorer Collapse */
.papercraft-explorer-pane {
  transition: width 0.22s cubic-bezier(0.16, 1, 0.3, 1), min-width 0.22s, max-width 0.22s, opacity 0.15s;
}

.papercraft-explorer-pane.collapsed {
  width: 0 !important;
  min-width: 0 !important;
  max-width: 0 !important;
  padding: 0 !important;
  border-right: none !important;
  opacity: 0 !important;
  overflow: hidden !important;
  pointer-events: none !important;
}

/* Overleaf Slide-Out Project Menu Drawer */
.papercraft-menu-drawer {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 320px;
  background: #181b21;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 10px 0 36px rgba(0, 0, 0, 0.65);
}

.papercraft-menu-drawer.open {
  transform: translateX(0);
}

#papercraft-studio-container.theme-light .papercraft-menu-drawer {
  background: #ffffff;
  border-right: 1px solid #e2e8f0;
  box-shadow: 8px 0 32px rgba(0, 0, 0, 0.15);
}

.papercraft-menu-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.papercraft-menu-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.menu-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.menu-drawer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.menu-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 15px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all 0.15s;
}

.menu-close-btn:hover {
  background: var(--border);
  color: var(--text-main);
}

.menu-drawer-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.menu-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.menu-section-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.menu-actions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.menu-action-btn {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
}

.menu-action-btn:hover {
  background: var(--bg-card-hover);
  border-color: #6366f1;
  transform: translateY(-1px);
}

.menu-action-btn .action-icon {
  font-size: 20px;
}

.menu-action-btn .action-text strong {
  display: block;
  font-size: 12px;
  color: var(--text-main);
}

.menu-action-btn .action-text span {
  display: block;
  font-size: 10px;
  color: var(--text-dim);
}

.menu-actions-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.menu-list-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  width: 100%;
}

.menu-list-btn:hover {
  background: var(--bg-card-hover);
  border-color: #6366f1;
  transform: translateX(2px);
}

.menu-list-btn .btn-icon {
  font-size: 16px;
  flex-shrink: 0;
}

.menu-list-btn .btn-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.menu-list-btn .btn-meta strong {
  font-size: 12px;
  color: var(--text-main);
}

.menu-list-btn .btn-meta span {
  font-size: 10.5px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.menu-field-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.menu-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

.menu-select {
  padding: 6px 10px;
  font-size: 12px;
  border-radius: 6px;
}

.menu-field-hint {
  font-size: 10px;
  color: var(--text-dim);
  font-style: italic;
}

/* Upload Dropzone & Chips */
.upload-dropzone:hover,
.upload-dropzone.drag-over {
  border-color: #6366f1 !important;
  background: rgba(99, 102, 241, 0.08) !important;
}

.selected-file-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  margin-bottom: 6px;
}

/* Overleaf-Style Upload Modal & Dropzone */
.overleaf-modal-dialog {
  background: var(--bg-card) !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45) !important;
}

.overleaf-dropzone {
  border: 2px dashed rgba(99, 102, 241, 0.45);
  border-radius: 8px;
  padding: 26px 18px;
  text-align: center;
  background: var(--bg-sidebar);
  transition: all 0.2s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.overleaf-dropzone:hover,
.overleaf-dropzone.drag-over {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.08) !important;
}

.dropzone-cloud-icon {
  font-size: 38px;
  margin-bottom: 6px;
  line-height: 1;
}

.dropzone-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 3px;
}

.dropzone-sub {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin: 4px 0 8px 0;
  letter-spacing: 0.5px;
}

.btn-select-computer {
  background: #3b82f6;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  padding: 7px 16px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
  box-shadow: 0 2px 6px rgba(59, 130, 246, 0.3);
}

.btn-select-computer:hover {
  background: #2563eb;
}

.dropzone-hint {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 10px;
}

/* ==========================================================================
   Phase 8: In-Browser & Mobile/Tablet Canvas PDF Viewer (Mozilla PDF.js)
   ========================================================================== */

.pdf-nav-group, .pdf-zoom-group {
  display: flex;
  align-items: center;
  background: var(--bg-hover, rgba(255, 255, 255, 0.06));
  border: 1px solid var(--border-color, rgba(255, 255, 255, 0.12));
  border-radius: 6px;
  overflow: hidden;
}

.pdf-tool-btn {
  background: transparent;
  border: none;
  color: var(--text-main, #e2e8f0);
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  user-select: none;
}

.pdf-tool-btn:hover {
  background: var(--bg-card, rgba(255, 255, 255, 0.15));
  color: #ffffff;
}

.pdf-tool-btn:active {
  transform: scale(0.95);
}

.pdf-page-indicator {
  font-size: 11px;
  font-weight: 600;
  padding: 0 6px;
  color: var(--text-muted, #94a3b8);
  font-family: var(--font-mono, monospace);
  user-select: none;
  white-space: nowrap;
}

.pdf-canvas-scroll-container {
  width: 100%;
  height: 100%;
  overflow-y: auto;
  overflow-x: auto;
  background: #2b2d30;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x pan-y pinch-zoom;
  padding: 20px 10px;
  box-sizing: border-box;
}

body.light-theme .pdf-canvas-scroll-container {
  background: #cbd5e1;
}

.pdf-pages-mount {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
}

.pdf-page-card {
  position: relative;
  background: #ffffff;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  border-radius: 3px;
  transition: box-shadow 0.2s ease;
  user-select: text;
  -webkit-user-select: text;
  cursor: text;
  display: inline-block;
}

body.light-theme .pdf-page-card {
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.18);
}

.pdf-page-card:hover {
  box-shadow: 0 6px 26px rgba(0, 0, 0, 0.45);
}

.pdf-page-card.pan-mode {
  user-select: none;
  -webkit-user-select: none;
  cursor: grab;
}

.pdf-page-card.pan-mode:active {
  cursor: grabbing;
}

/* PDF.js High-Fidelity Transparent Text Layer for Selection & Copying */
.pdf-page-card .textLayer {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  opacity: 1;
  line-height: 1.0;
  user-select: text;
  -webkit-user-select: text;
  cursor: text;
  z-index: 2;
  transform-origin: 0 0;
}

.pdf-page-card .textLayer span,
.pdf-page-card .textLayer div {
  color: transparent !important;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
  pointer-events: all;
  box-sizing: border-box;
}

.pdf-page-card .textLayer ::selection,
.pdf-page-card .textLayer *::selection {
  background: rgba(37, 99, 235, 0.38) !important;
  color: transparent !important;
}

.pdf-canvas-scroll-container.pdf-pan-mode {
  cursor: grab !important;
}
.pdf-canvas-scroll-container.pdf-pan-mode:active {
  cursor: grabbing !important;
}
.pdf-canvas-scroll-container.pdf-pan-mode .textLayer {
  pointer-events: none !important;
}

/* Local Spellcheck Misspelling Wavy Red Underline in Ace Editor */
.ace_spellcheck_error {
  position: absolute;
  border-bottom: 2px wavy #ef4444 !important;
  border-radius: 1px;
  background-color: rgba(239, 68, 68, 0.08);
  z-index: 20;
}

.pdf-page-canvas {
  display: block;
  border-radius: 3px;
  position: relative;
  z-index: 1;
}

.pdf-page-badge {
  position: absolute;
  z-index: 3;
  bottom: 8px;
  right: 8px;
  background: rgba(15, 23, 42, 0.75);
  color: #f8fafc;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-mono, monospace);
  pointer-events: none;
  opacity: 0.8;
  backdrop-filter: blur(2px);
}

.pdf-loading-indicator {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: #f8fafc;
  font-size: 13px;
  font-weight: 500;
  background: rgba(15, 23, 42, 0.88);
  padding: 18px 26px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  z-index: 10;
  backdrop-filter: blur(4px);
}

.pdf-spinner {
  width: 30px;
  height: 30px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: #6366f1;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.pdf-empty-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 280px;
  color: var(--text-muted, #94a3b8);
  text-align: center;
  padding: 24px;
}

.pdf-empty-icon {
  font-size: 46px;
  margin-bottom: 12px;
  opacity: 0.65;
}

.pdf-empty-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main, #f1f5f9);
  margin-bottom: 6px;
}

.pdf-empty-desc {
  font-size: 12px;
  max-width: 340px;
  line-height: 1.5;
  color: var(--text-dim, #64748b);
}

@media (max-width: 768px) {
  .preview-toolbar-actions {
    gap: 4px;
  }
  .pdf-tool-btn {
    padding: 3px 6px;
    font-size: 10px;
  }
  .pdf-page-indicator {
    padding: 0 4px;
    font-size: 10px;
  }
}

/* ==========================================================================
   Phase 9: Standalone Full-Page Overleaf Experience & Smart Top Nav Bar
   ========================================================================== */

body.papercraft-page-active {
  overflow: hidden !important;
}

body.papercraft-page-active .desktop-sidebar,
body.papercraft-page-active .top-header,
body.papercraft-page-active .mobile-bottom-nav {
  display: none !important;
}

body.papercraft-page-active .content-container {
  padding: 0 !important;
  margin: 0 !important;
  overflow: hidden !important;
}

body.papercraft-page-active #view-papercraft {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 0 !important;
  width: 100vw !important;
  height: 100vh !important;
  z-index: 10000 !important;
  background: transparent !important;
  display: flex !important;
  flex-direction: column !important;
  overflow: hidden !important;
  margin: 0 !important;
  padding: 0 !important;
  box-sizing: border-box !important;
}

body.papercraft-page-active.light-theme #view-papercraft {
  background: #f8fafc !important;
}

/* --- PaperCraft Hub Full-Page Overleaf Design --- */
#papercraft-hub-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: transparent;
}

body.light-theme #papercraft-hub-container {
  background: #f1f5f9;
}

.overleaf-hub-navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 20px;
  background: #181b20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
  gap: 16px;
  z-index: 10;
}

body.light-theme .overleaf-hub-navbar {
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
}

.overleaf-nav-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.overleaf-hub-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  user-select: none;
}

.overleaf-logo-circle {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: #439b45;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(67, 155, 69, 0.35);
}

.overleaf-brand-text {
  display: flex;
  flex-direction: column;
}

.overleaf-brand-title {
  font-size: 15px;
  font-weight: 800;
  color: #f8fafc;
  letter-spacing: -0.2px;
  line-height: 1.1;
}

body.light-theme .overleaf-brand-title {
  color: #0f172a;
}

.overleaf-brand-subtitle {
  font-size: 10px;
  font-weight: 600;
  color: #439b45;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.overleaf-nav-center {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  max-width: 640px;
}

.overleaf-search-wrap {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.overleaf-search-wrap .search-icon {
  position: absolute;
  left: 10px;
  font-size: 12px;
  color: var(--text-dim, #64748b);
  pointer-events: none;
}

.overleaf-search-box {
  width: 100%;
  height: 32px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  padding: 0 12px 0 30px;
  color: #f8fafc;
  font-size: 12.5px;
  outline: none;
  transition: all 0.15s ease;
}

.overleaf-search-box:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: #439b45;
  box-shadow: 0 0 0 2px rgba(67, 155, 69, 0.2);
}

body.light-theme .overleaf-search-box {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #0f172a;
}

.overleaf-nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-overleaf-new {
  background: #439b45;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  box-shadow: 0 2px 6px rgba(67, 155, 69, 0.3);
}

.btn-overleaf-new:hover {
  background: #38843a;
  transform: translateY(-1px);
}

.btn-overleaf-import {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main, #e2e8f0);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-overleaf-import:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
}

body.light-theme .btn-overleaf-import {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #334155;
}

/* Close & Return to Dashboard Button */
.btn-overleaf-close {
  background: rgba(239, 68, 68, 0.14) !important;
  color: #fca5a5 !important;
  border: 1px solid rgba(239, 68, 68, 0.35) !important;
  border-radius: 6px !important;
  padding: 6px 12px !important;
  font-size: 12px !important;
  font-weight: 700 !important;
  cursor: pointer !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  transition: all 0.15s ease !important;
  user-select: none !important;
}

.btn-overleaf-close:hover {
  background: #dc2626 !important;
  color: #ffffff !important;
  border-color: #dc2626 !important;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.4) !important;
  transform: translateY(-1px) !important;
}

/* Sub-banner for Hub */
.overleaf-hub-scrollable {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px 48px;
  -webkit-overflow-scrolling: touch;
}

.overleaf-hub-subbanner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

body.light-theme .overleaf-hub-subbanner {
  border-bottom-color: #e2e8f0;
}

.subbanner-left h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main, #f8fafc);
  margin-bottom: 4px;
}

.subbanner-left p {
  font-size: 12px;
  color: var(--text-muted, #94a3b8);
  margin: 0;
}

.hub-stat-pill {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim, #64748b);
  background: rgba(255, 255, 255, 0.06);
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Topbar Subtle Buttons (Light/Dark toggle, Projects hub) */
.btn-topbar-subtle {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main, #e2e8f0);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
}

.btn-topbar-subtle:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
}

body.light-theme .btn-topbar-subtle {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #334155;
}

/* Overleaf Green Studio Menu button */
.btn-overleaf-menu {
  background: #439b45 !important;
  color: #ffffff !important;
  border: none !important;
  border-radius: 5px !important;
  padding: 6px 12px !important;
  font-size: 12.5px !important;
  font-weight: 700 !important;
  display: flex !important;
  align-items: center !important;
  gap: 6px !important;
  cursor: pointer !important;
  box-shadow: 0 1px 4px rgba(67, 155, 69, 0.3) !important;
}

.btn-overleaf-menu:hover {
  background: #38843a !important;
  transform: translateY(-1px) !important;
}

/* Overleaf Green Compile Button */
.btn-recompile {
  background: #439b45 !important;
  color: #ffffff !important;
  font-weight: 700 !important;
  font-size: 13px !important;
  padding: 6px 16px !important;
  border-radius: 5px !important;
  border: none !important;
  cursor: pointer !important;
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  box-shadow: 0 2px 6px rgba(67, 155, 69, 0.35) !important;
  transition: all 0.15s ease !important;
}

.btn-recompile:hover {
  background: #38843a !important;
  transform: translateY(-1px) !important;
}

/* Studio Document Title Styling */
.studio-manuscript-title {
  font-size: 13.5px !important;
  font-weight: 700 !important;
  color: #f8fafc !important;
  max-width: 280px !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
}

body.light-theme .studio-manuscript-title {
  color: #0f172a !important;
}

/* Full-Page Studio Overrides */
body.papercraft-page-active #papercraft-studio-container {
  width: 100vw !important;
  height: 100vh !important;
  min-height: 100vh !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  margin: 0 !important;
  display: flex !important;
  flex-direction: column !important;
  overflow: hidden !important;
}

body.papercraft-page-active .papercraft-studio-body {
  flex: 1 !important;
  min-height: 0 !important;
  height: calc(100vh - 48px) !important;
  display: flex !important;
  overflow: hidden !important;
}

/* ==========================================================================
   Phase 10: Tile Hub in Portal Layout & Full-Page Standalone Studio on Open
   ========================================================================== */

#papercraft-hub-container {
  width: 100%;
  display: flex;
  flex-direction: column;
}

.papercraft-hub-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.papercraft-hub-title {
  display: flex;
  align-items: center;
  gap: 12px;
}

.papercraft-hub-title h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.papercraft-hub-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Phase 11: High-Contrast Light Theme Overrides & Zip Dropzone Styles
   ========================================================================== */

/* Eliminate dark background on PaperCraft Hub in Light Theme */
[data-theme="light"] #papercraft-hub-container,
html[data-theme="light"] #papercraft-hub-container,
body[data-theme="light"] #papercraft-hub-container,
body.light-theme #papercraft-hub-container {
  background: transparent !important;
}

[data-theme="light"] #view-papercraft,
html[data-theme="light"] #view-papercraft,
body[data-theme="light"] #view-papercraft,
body.light-theme #view-papercraft {
  background: transparent !important;
}

[data-theme="light"] .papercraft-card,
html[data-theme="light"] .papercraft-card,
body[data-theme="light"] .papercraft-card {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05) !important;
}

[data-theme="light"] .papercraft-card-title,
html[data-theme="light"] .papercraft-card-title {
  color: #0f172a !important;
}

[data-theme="light"] .papercraft-card-desc,
html[data-theme="light"] .papercraft-card-desc {
  color: #475569 !important;
}

[data-theme="light"] .papercraft-card-meta,
html[data-theme="light"] .papercraft-card-meta {
  color: #64748b !important;
  border-top-color: #e2e8f0 !important;
}

/* Studio in Light Theme: High-Contrast Button & Text Visibility */
[data-theme="light"] #papercraft-studio-container,
html[data-theme="light"] #papercraft-studio-container,
#papercraft-studio-container.theme-light {
  background: #f8fafc !important;
  color: #0f172a !important;
}

[data-theme="light"] .papercraft-studio-topbar,
html[data-theme="light"] .papercraft-studio-topbar,
#papercraft-studio-container.theme-light .papercraft-studio-topbar {
  background: #ffffff !important;
  border-bottom: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .studio-manuscript-title,
html[data-theme="light"] .studio-manuscript-title,
#papercraft-studio-container.theme-light .studio-manuscript-title {
  color: #0f172a !important;
  font-weight: 700 !important;
}

[data-theme="light"] .btn-toggle-files,
html[data-theme="light"] .btn-toggle-files,
#papercraft-studio-container.theme-light .btn-toggle-files {
  background: #f1f5f9 !important;
  color: #1e293b !important;
  border: 1px solid #cbd5e1 !important;
}
[data-theme="light"] .btn-toggle-files:hover,
html[data-theme="light"] .btn-toggle-files:hover,
#papercraft-studio-container.theme-light .btn-toggle-files:hover {
  background: #e2e8f0 !important;
  color: #0f172a !important;
  border-color: #94a3b8 !important;
}

[data-theme="light"] .btn-topbar-subtle,
html[data-theme="light"] .btn-topbar-subtle,
#papercraft-studio-container.theme-light .btn-topbar-subtle {
  background: #f1f5f9 !important;
  color: #1e293b !important;
  border: 1px solid #cbd5e1 !important;
}
[data-theme="light"] .btn-topbar-subtle:hover,
html[data-theme="light"] .btn-topbar-subtle:hover,
#papercraft-studio-container.theme-light .btn-topbar-subtle:hover {
  background: #e2e8f0 !important;
  color: #0f172a !important;
  border-color: #94a3b8 !important;
}

[data-theme="light"] .btn-overleaf-close,
html[data-theme="light"] .btn-overleaf-close,
#papercraft-studio-container.theme-light .btn-overleaf-close {
  background: rgba(239, 68, 68, 0.1) !important;
  color: #b91c1c !important;
  border: 1px solid rgba(239, 68, 68, 0.3) !important;
  font-weight: 700 !important;
}
[data-theme="light"] .btn-overleaf-close:hover,
html[data-theme="light"] .btn-overleaf-close:hover,
#papercraft-studio-container.theme-light .btn-overleaf-close:hover {
  background: #dc2626 !important;
  color: #ffffff !important;
  border-color: #dc2626 !important;
}

[data-theme="light"] .overleaf-segmented-group,
html[data-theme="light"] .overleaf-segmented-group,
#papercraft-studio-container.theme-light .overleaf-segmented-group {
  background: #e2e8f0 !important;
  border: 1px solid #cbd5e1 !important;
}

[data-theme="light"] .segmented-item,
html[data-theme="light"] .segmented-item,
#papercraft-studio-container.theme-light .segmented-item {
  color: #334155 !important;
}

[data-theme="light"] .segmented-item.active,
html[data-theme="light"] .segmented-item.active,
#papercraft-studio-container.theme-light .segmented-item.active {
  background: #4f46e5 !important;
  color: #ffffff !important;
}

/* File Explorer in Light Theme */
[data-theme="light"] .papercraft-explorer-pane,
html[data-theme="light"] .papercraft-explorer-pane,
#papercraft-studio-container.theme-light .papercraft-explorer-pane {
  background: #f8fafc !important;
  border-right: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .explorer-header,
html[data-theme="light"] .explorer-header,
#papercraft-studio-container.theme-light .explorer-header {
  background: #f1f5f9 !important;
  color: #1e293b !important;
  border-bottom: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .explorer-icon-btn,
html[data-theme="light"] .explorer-icon-btn,
#papercraft-studio-container.theme-light .explorer-icon-btn {
  background: #ffffff !important;
  color: #1e293b !important;
  border: 1px solid #cbd5e1 !important;
  font-weight: 600 !important;
}
[data-theme="light"] .explorer-icon-btn:hover,
html[data-theme="light"] .explorer-icon-btn:hover,
#papercraft-studio-container.theme-light .explorer-icon-btn:hover {
  background: #e2e8f0 !important;
  color: #0f172a !important;
}

[data-theme="light"] .tree-item,
html[data-theme="light"] .tree-item,
#papercraft-studio-container.theme-light .tree-item {
  color: #1e293b !important;
}
[data-theme="light"] .tree-item:hover,
html[data-theme="light"] .tree-item:hover,
#papercraft-studio-container.theme-light .tree-item:hover {
  background: #e2e8f0 !important;
  color: #0f172a !important;
}
[data-theme="light"] .tree-item.active,
html[data-theme="light"] .tree-item.active,
#papercraft-studio-container.theme-light .tree-item.active {
  background: rgba(99, 102, 241, 0.15) !important;
  color: #4338ca !important;
  font-weight: 700 !important;
}

/* Editor Tabs & Statusbar in Light Theme */
[data-theme="light"] .editor-tabs-bar,
html[data-theme="light"] .editor-tabs-bar,
#papercraft-studio-container.theme-light .editor-tabs-bar {
  background: #f1f5f9 !important;
  border-bottom: 1px solid #e2e8f0 !important;
}

[data-theme="light"] .editor-tab,
html[data-theme="light"] .editor-tab,
#papercraft-studio-container.theme-light .editor-tab {
  color: #475569 !important;
  border-right: 1px solid #e2e8f0 !important;
  background: transparent !important;
}

[data-theme="light"] .editor-tab.active,
html[data-theme="light"] .editor-tab.active,
#papercraft-studio-container.theme-light .editor-tab.active {
  background: #ffffff !important;
  color: #0f172a !important;
  font-weight: 700 !important;
  border-bottom: 2px solid #6366f1 !important;
}

[data-theme="light"] .editor-statusbar,
html[data-theme="light"] .editor-statusbar,
#papercraft-studio-container.theme-light .editor-statusbar {
  background: #f8fafc !important;
  color: #334155 !important;
  border-top: 1px solid #e2e8f0 !important;
}
[data-theme="light"] .editor-statusbar span,
html[data-theme="light"] .editor-statusbar span,
#papercraft-studio-container.theme-light .editor-statusbar span {
  color: #334155 !important;
}

/* Split Resizer in Light Theme */
[data-theme="light"] .papercraft-split-resizer,
html[data-theme="light"] .papercraft-split-resizer,
#papercraft-studio-container.theme-light .papercraft-split-resizer {
  background: #e2e8f0 !important;
  border-left: 1px solid #cbd5e1 !important;
  border-right: 1px solid #cbd5e1 !important;
}

/* PDF Preview Toolbar & Pane in Light Theme */
[data-theme="light"] .papercraft-preview-pane,
html[data-theme="light"] .papercraft-preview-pane,
#papercraft-studio-container.theme-light .papercraft-preview-pane {
  background: #cbd5e1 !important;
}

[data-theme="light"] .preview-top-tabs,
html[data-theme="light"] .preview-top-tabs,
#papercraft-studio-container.theme-light .preview-top-tabs {
  background: #f8fafc !important;
  border-bottom: 1px solid #cbd5e1 !important;
}

[data-theme="light"] .preview-tab-btn,
html[data-theme="light"] .preview-tab-btn,
#papercraft-studio-container.theme-light .preview-tab-btn {
  color: #475569 !important;
}
[data-theme="light"] .preview-tab-btn.active,
html[data-theme="light"] .preview-tab-btn.active,
#papercraft-studio-container.theme-light .preview-tab-btn.active {
  background: #ffffff !important;
  color: #0f172a !important;
  font-weight: 700 !important;
  border-bottom: 2px solid #439b45 !important;
}

[data-theme="light"] .pdf-nav-group,
html[data-theme="light"] .pdf-nav-group,
#papercraft-studio-container.theme-light .pdf-nav-group,
[data-theme="light"] .pdf-zoom-group,
html[data-theme="light"] .pdf-zoom-group,
#papercraft-studio-container.theme-light .pdf-zoom-group {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
}

[data-theme="light"] .pdf-tool-btn,
html[data-theme="light"] .pdf-tool-btn,
#papercraft-studio-container.theme-light .pdf-tool-btn {
  color: #0f172a !important;
  font-weight: 700 !important;
}
[data-theme="light"] .pdf-tool-btn:hover,
html[data-theme="light"] .pdf-tool-btn:hover,
#papercraft-studio-container.theme-light .pdf-tool-btn:hover {
  background: #f1f5f9 !important;
  color: #0f172a !important;
}

[data-theme="light"] .pdf-page-indicator,
html[data-theme="light"] .pdf-page-indicator,
#papercraft-studio-container.theme-light .pdf-page-indicator {
  color: #0f172a !important;
  font-weight: 700 !important;
}

[data-theme="light"] #btn-toggle-reverse-synctex,
html[data-theme="light"] #btn-toggle-reverse-synctex,
#papercraft-studio-container.theme-light #btn-toggle-reverse-synctex {
  background: #ffffff !important;
  color: #0f172a !important;
  border: 1px solid #cbd5e1 !important;
  font-weight: 600 !important;
}

[data-theme="light"] .preview-toolbar-actions .explorer-icon-btn,
html[data-theme="light"] .preview-toolbar-actions .explorer-icon-btn,
#papercraft-studio-container.theme-light .preview-toolbar-actions .explorer-icon-btn {
  background: #ffffff !important;
  color: #0f172a !important;
  border: 1px solid #cbd5e1 !important;
}

[data-theme="light"] .pdf-canvas-scroll-container,
html[data-theme="light"] .pdf-canvas-scroll-container,
#papercraft-studio-container.theme-light .pdf-canvas-scroll-container {
  background: #cbd5e1 !important;
}

/* Project Menu Drawer in Light Theme */
[data-theme="light"] .papercraft-menu-drawer,
html[data-theme="light"] .papercraft-menu-drawer,
#papercraft-studio-container.theme-light .papercraft-menu-drawer {
  background: #ffffff !important;
  border-right: 1px solid #e2e8f0 !important;
  color: #0f172a !important;
}
[data-theme="light"] .menu-drawer-header,
html[data-theme="light"] .menu-drawer-header,
#papercraft-studio-container.theme-light .menu-drawer-header {
  background: #f8fafc !important;
  border-bottom: 1px solid #e2e8f0 !important;
  color: #0f172a !important;
}
[data-theme="light"] .menu-section-title,
html[data-theme="light"] .menu-section-title,
#papercraft-studio-container.theme-light .menu-section-title {
  color: #64748b !important;
}
[data-theme="light"] .menu-action-btn,
html[data-theme="light"] .menu-action-btn,
#papercraft-studio-container.theme-light .menu-action-btn {
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
  color: #0f172a !important;
}
[data-theme="light"] .menu-action-btn:hover,
html[data-theme="light"] .menu-action-btn:hover,
#papercraft-studio-container.theme-light .menu-action-btn:hover {
  background: #e2e8f0 !important;
}
[data-theme="light"] .menu-select,
html[data-theme="light"] .menu-select,
#papercraft-studio-container.theme-light .menu-select {
  background: #f8fafc !important;
  color: #0f172a !important;
  border: 1px solid #cbd5e1 !important;
}

/* Dropzone dragover state */
.overleaf-dropzone.dragover {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.08) !important;
}

/* --- PHASE 12: MODAL Z-INDEX ELEVATION & TOUCH DROPZONE --- */
.modal-backdrop,
.modal-backdrop.active,
#modal-papercraft-github,
#modal-papercraft-history,
#modal-papercraft-diff,
#modal-papercraft-upload-zip,
#modal-papercraft-upload-asset,
#modal-papercraft-new-file,
#modal-papercraft-new {
  z-index: 100005 !important;
}

.overleaf-dropzone {
  transition: all 0.2s ease;
  user-select: none;
  -webkit-user-select: none;
}

.overleaf-dropzone:hover,
.overleaf-dropzone.drag-active {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.08) !important;
}

.overleaf-dropzone .btn-select-computer {
  pointer-events: none;
  background: #3b82f6;
  color: #ffffff;
  padding: 8px 18px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 13px;
  margin: 8px 0;
  display: inline-block;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

[data-theme="light"] .overleaf-dropzone .btn-select-computer {
  background: #2563eb;
  color: #ffffff !important;
}

[data-theme="light"] #modal-papercraft-upload-zip .modal-title,
[data-theme="light"] #modal-papercraft-history .modal-title,
[data-theme="light"] #modal-papercraft-github .modal-title {
  color: #0f172a !important;
}

[data-theme="light"] #modal-papercraft-upload-zip .form-input {
  background: #ffffff !important;
  color: #0f172a !important;
  border-color: #cbd5e1 !important;
}

/* --- PHASE 14: PROPER SYMBOLS, HOVER TOOLTIPS & USER AVATARS --- */

/* Modern Studio Floating Tooltips on Hover */
.papercraft-studio-topbar [data-tooltip] {
  position: relative;
}

.papercraft-studio-topbar [data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.95);
  background: #0f172a;
  color: #f8fafc;
  font-size: 11px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.15);
  z-index: 1000000;
}

.papercraft-studio-topbar [data-tooltip]:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) scale(1);
}

/* Tooltip positioning adjustments for screen edges */
.studio-topbar-right [data-tooltip]::after {
  left: auto;
  right: 0;
  transform: translateX(0) scale(0.95);
}
.studio-topbar-right [data-tooltip]:hover::after {
  transform: translateX(0) scale(1);
}

.studio-topbar-left [data-tooltip]::after {
  left: 0;
  transform: translateX(0) scale(0.95);
}
.studio-topbar-left [data-tooltip]:hover::after {
  transform: translateX(0) scale(1);
}

/* Light Mode Tooltip Styling */
[data-theme="light"] .papercraft-studio-topbar [data-tooltip]::after,
html[data-theme="light"] .papercraft-studio-topbar [data-tooltip]::after,
#papercraft-studio-container.theme-light [data-tooltip]::after {
  background: #1e293b;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.2);
}

/* Studio Tool & Icon Buttons */
.studio-tool-btn,
.studio-icon-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 32px !important;
  height: 32px !important;
  padding: 0 8px !important;
  border-radius: 6px !important;
  cursor: pointer !important;
  transition: all 0.15s ease !important;
  border: 1px solid transparent !important;
}

.studio-tool-btn:not(.btn-recompile):not(.btn-clean-recompile):not(.btn-overleaf-menu):not(.segmented-item):hover,
.studio-icon-btn:hover {
  background: rgba(255, 255, 255, 0.12) !important;
  border-color: rgba(255, 255, 255, 0.22) !important;
  color: #ffffff !important;
}

[data-theme="light"] .studio-tool-btn:not(.btn-recompile):not(.btn-clean-recompile):not(.btn-overleaf-menu):not(.segmented-item):hover,
[data-theme="light"] .studio-icon-btn:hover,
#papercraft-studio-container.theme-light .studio-tool-btn:not(.btn-recompile):not(.btn-clean-recompile):not(.btn-overleaf-menu):not(.segmented-item):hover,
#papercraft-studio-container.theme-light .studio-icon-btn:hover {
  background: #e2e8f0 !important;
  border-color: #94a3b8 !important;
  color: #0f172a !important;
}

/* Explicit High-Contrast Hover Styles for Recompile, Clean, Menu, Segmented & Close Buttons */
.btn-recompile {
  background: #15803d !important;
  color: #ffffff !important;
  font-weight: 700 !important;
  border: 1px solid #166534 !important;
  box-shadow: 0 1px 4px rgba(21, 128, 61, 0.35) !important;
}
.btn-recompile:hover {
  background: #166534 !important;
  color: #ffffff !important;
  border-color: #14532d !important;
  box-shadow: 0 2px 8px rgba(21, 128, 61, 0.5) !important;
  transform: translateY(-1px);
}

.btn-clean-recompile {
  display: inline-flex !important;
  align-items: center !important;
  gap: 5px !important;
  background: #1e293b !important;
  color: #ffffff !important;
  font-weight: 600 !important;
  border: 1px solid #475569 !important;
  border-radius: 6px !important;
  padding: 5px 12px !important;
  font-size: 12px !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25) !important;
  cursor: pointer !important;
  transition: all 0.15s ease !important;
  white-space: nowrap !important;
}
.btn-clean-recompile svg {
  color: #f59e0b !important;
  stroke: #f59e0b !important;
}
.btn-clean-recompile:hover {
  background: #334155 !important;
  color: #ffffff !important;
  border-color: #64748b !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4) !important;
  transform: translateY(-1px);
}
[data-theme="light"] .btn-clean-recompile,
#papercraft-studio-container.theme-light .btn-clean-recompile {
  background: #f1f5f9 !important;
  color: #1e293b !important;
  border-color: #cbd5e1 !important;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06) !important;
}
[data-theme="light"] .btn-clean-recompile:hover,
#papercraft-studio-container.theme-light .btn-clean-recompile:hover {
  background: #e2e8f0 !important;
  color: #0f172a !important;
  border-color: #94a3b8 !important;
}

.btn-overleaf-menu {
  background: #1d4ed8 !important;
  color: #ffffff !important;
  font-weight: 700 !important;
  border: 1px solid #1e40af !important;
  box-shadow: 0 1px 4px rgba(29, 78, 216, 0.35) !important;
}
.btn-overleaf-menu:hover {
  background: #1e40af !important;
  color: #ffffff !important;
  border-color: #172554 !important;
  box-shadow: 0 2px 8px rgba(29, 78, 216, 0.5) !important;
  transform: translateY(-1px);
}

.overleaf-segmented-group {
  background: rgba(15, 23, 42, 0.8) !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
  border-radius: 6px !important;
  padding: 2px !important;
  display: inline-flex !important;
  align-items: center !important;
}
.overleaf-segmented-group .segmented-item {
  background: transparent !important;
  color: #94a3b8 !important;
  border: none !important;
  border-radius: 4px !important;
  transition: all 0.15s ease !important;
  padding: 4px 10px !important;
  min-width: 32px !important;
  height: 28px !important;
}
.overleaf-segmented-group .segmented-item:hover {
  background: rgba(255, 255, 255, 0.15) !important;
  color: #f8fafc !important;
}
.overleaf-segmented-group .segmented-item.active {
  background: #4f46e5 !important;
  color: #ffffff !important;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35) !important;
}
.overleaf-segmented-group .segmented-item.active:hover {
  background: #4338ca !important;
  color: #ffffff !important;
}

.modal-close-btn,
.menu-close-btn {
  width: 30px !important;
  height: 30px !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  border-radius: 6px !important;
  background: transparent !important;
  border: none !important;
  color: #94a3b8 !important;
  font-size: 20px !important;
  line-height: 1 !important;
  cursor: pointer !important;
  transition: all 0.15s ease !important;
}
.modal-close-btn:hover,
.menu-close-btn:hover {
  background: rgba(239, 68, 68, 0.18) !important;
  color: #ef4444 !important;
  transform: scale(1.08) !important;
}

/* Responsive GNUPlot Preview Canvas - Never overflow modal or screen */
#gnuplot-preview-container {
  max-width: 100% !important;
  max-height: 100% !important;
  overflow: auto !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 16px !important;
}

#gnuplot-preview-container svg {
  max-width: 100% !important;
  max-height: calc(88vh - 120px) !important;
  width: auto !important;
  height: auto !important;
  object-fit: contain !important;
  display: block !important;
  margin: auto !important;
  border-radius: 6px !important;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08) !important;
}

/* Studio Avatars Cluster & Bubbles */
.studio-avatars-cluster {
  display: inline-flex;
  align-items: center;
  padding: 0 4px;
}

.studio-avatar-bubble {
  position: relative;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.5px;
  border: 2px solid var(--bg-card, #1e293b);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  transition: transform 0.15s ease, z-index 0.15s ease;
  user-select: none;
}

.studio-avatar-bubble:hover {
  transform: scale(1.15);
  z-index: 20;
}

.studio-avatar-bubble + .studio-avatar-bubble {
  margin-left: -8px;
}

.avatar-status-dot.online {
  position: absolute;
  bottom: -1px;
  right: -1px;
  width: 8px;
  height: 8px;
  background: #10b981;
  border: 1.5px solid #0f172a;
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(16, 185, 129, 0.9);
}

.avatar-edit-icon {
  position: absolute;
  top: -5px;
  right: -5px;
  font-size: 9px;
  background: rgba(15, 23, 42, 0.9);
  border-radius: 50%;
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  animation: editPulse 2s infinite ease-in-out;
}

@keyframes editPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.25); }
}

/* Mobile & Android Tablet Dialog & Touch Dropzone Adjustments */
@media (max-width: 768px) {
  .papercraft-studio-topbar {
    padding: 0 6px !important;
    gap: 4px !important;
  }
  .btn-text-recompile {
    display: none !important;
  }
  .btn-recompile {
    padding: 0 10px !important;
  }
  .overleaf-modal-dialog {
    max-width: 95vw !important;
    margin: 10px auto !important;
  }
}

/* Spellcheck Underline & Suggestion Styling */
.ace_spellcheck_error {
  position: absolute;
  border-bottom: 2px wavy #ef4444 !important;
  margin-bottom: -1px;
  border-radius: 1px;
  background: rgba(239, 68, 68, 0.08);
}

#btn-toggle-spellcheck.active {
  color: #10b981 !important;
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: rgba(16, 185, 129, 0.4) !important;
}

/* Live Multi-User Sync Toast Notification */
.live-sync-toast {
  position: fixed;
  bottom: 42px;
  right: 24px;
  background: rgba(15, 23, 42, 0.94);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.45);
  backdrop-filter: blur(10px);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
  z-index: 9999;
  animation: fadeInSlideUp 0.25s ease-out;
  pointer-events: none;
}

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

/* File Tree Explorer Direct Drag & Drop Highlight */
.papercraft-explorer-pane.drag-over {
  outline: 2px dashed #3b82f6 !important;
  outline-offset: -3px;
  background: rgba(59, 130, 246, 0.08) !important;
}

/* Spellcheck Suggestion Menu */
.spellcheck-suggestion-menu {
  position: absolute;
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border, #334155);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  padding: 6px;
  z-index: 10000;
  min-width: 160px;
  max-width: 260px;
  font-size: 13px;
}

.spellcheck-suggestion-item {
  padding: 6px 12px;
  border-radius: 5px;
  cursor: pointer;
  color: var(--text-main, #f1f5f9);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.15s ease;
}

.spellcheck-suggestion-item:hover {
  background: #2563eb;
  color: #ffffff;
}



/* Phase 16 Progress & Extraction Animations */
@keyframes progressStripe {
  0% { background-position: 0 0; }
  100% { background-position: 40px 0; }
}

.progress-bar-extracting {
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.25) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.25) 50%,
    rgba(255, 255, 255, 0.25) 75%,
    transparent 75%,
    transparent
  ) !important;
  background-size: 40px 40px !important;
  animation: progressStripe 0.8s linear infinite !important;
}

.progress-bar-pulse {
  animation: pulseGlow 1.2s ease-in-out infinite alternate;
}

@keyframes pulseGlow {
  0% { filter: drop-shadow(0 0 2px rgba(16, 185, 129, 0.4)); }
  100% { filter: drop-shadow(0 0 8px rgba(16, 185, 129, 0.8)); }
}


/* Phase 17: Clean & Recompile is-cleaning state */
.btn-clean-recompile.is-cleaning {
  opacity: 0.7 !important;
  cursor: wait !important;
  pointer-events: none !important;
}

.btn-papercraft-share-topbar {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-weight: 600;
  font-size: 12px;
  color: #3b82f6 !important;
  background: rgba(59, 130, 246, 0.12) !important;
  border: 1px solid rgba(59, 130, 246, 0.35) !important;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-papercraft-share-topbar:hover {
  background: rgba(59, 130, 246, 0.22) !important;
  border-color: #3b82f6 !important;
  color: #60a5fa !important;
  transform: translateY(-1px);
}

.collaborator-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border, #334155);
  border-radius: 8px;
  transition: background 0.15s ease;
}

.collaborator-item-row:hover {
  background: rgba(255, 255, 255, 0.03);
}

.collaborator-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.collaborator-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
  color: #ffffff;
  flex-shrink: 0;
  text-transform: uppercase;
}

.collaborator-names {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.collaborator-fullname {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main, #f1f5f9);
}

.collaborator-username {
  font-size: 11px;
  color: var(--text-dim, #94a3b8);
}

.collaborator-role-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
}

.collaborator-role-owner {
  background: rgba(16, 185, 129, 0.18);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.collaborator-role-editor {
  background: rgba(59, 130, 246, 0.18);
  color: #3b82f6;
  border: 1px solid rgba(59, 130, 246, 0.35);
}

.collaborator-role-viewer {
  background: rgba(148, 163, 184, 0.18);
  color: #94a3b8;
  border: 1px solid rgba(148, 163, 184, 0.35);
}

.btn-remove-collaborator {
  background: transparent;
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-remove-collaborator:hover {
  background: #ef4444;
  color: #ffffff;
}


/* Phase 19: Multiple Editor Tabs */
.editor-tabs-bar {
  display: flex !important;
  align-items: center !important;
  background: var(--bg-sidebar, #0f172a) !important;
  border-bottom: 1px solid var(--border, #334155) !important;
  padding: 0 4px !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  flex-shrink: 0 !important;
  height: 38px !important;
  scrollbar-width: thin;
}

.editor-tabs-bar::-webkit-scrollbar {
  height: 3px;
}

.editor-tabs-bar::-webkit-scrollbar-thumb {
  background: var(--border, #334155);
  border-radius: 2px;
}

.editor-tab {
  display: inline-flex !important;
  align-items: center !important;
  gap: 7px !important;
  padding: 7px 12px !important;
  font-size: 12px !important;
  color: var(--text-muted, #94a3b8) !important;
  border-bottom: 2px solid transparent !important;
  cursor: pointer !important;
  background: transparent !important;
  border-right: 1px solid var(--border, #334155) !important;
  user-select: none !important;
  white-space: nowrap !important;
  max-width: 220px !important;
  transition: all 0.15s ease !important;
  flex-shrink: 0 !important;
}

.editor-tab:hover {
  background: rgba(255, 255, 255, 0.05) !important;
  color: var(--text-main, #f1f5f9) !important;
}

.editor-tab.active {
  background: var(--bg-card, #1e293b) !important;
  color: var(--text-main, #f1f5f9) !important;
  border-bottom-color: #3b82f6 !important;
  font-weight: 600 !important;
}

.editor-tab .tab-icon {
  font-size: 11px !important;
  display: inline-flex;
  align-items: center;
}

.editor-tab .tab-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.editor-tab .tab-close {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 16px !important;
  height: 16px !important;
  border-radius: 50% !important;
  font-size: 13px !important;
  line-height: 1 !important;
  color: var(--text-dim, #64748b) !important;
  opacity: 0.6 !important;
  transition: all 0.15s ease !important;
  margin-left: 2px !important;
}

.editor-tab .tab-close:hover {
  opacity: 1 !important;
  background: rgba(239, 68, 68, 0.25) !important;
  color: #ef4444 !important;
}

.editor-tab .tab-dirty-dot {
  color: #f59e0b !important;
  font-size: 9px !important;
  line-height: 1 !important;
  margin: 0 1px !important;
}

/* Phase 20: Real-Time DOM Pulse & Animation */
@keyframes realtimePulse {
  0% { background-color: rgba(16, 185, 129, 0.45); transform: scale(1.02); }
  50% { background-color: rgba(16, 185, 129, 0.2); }
  100% { background-color: transparent; transform: scale(1); }
}

.realtime-just-updated {
  animation: realtimePulse 1.8s ease-out forwards !important;
  border-radius: 4px;
}

.tree-item-deleted {
  transition: all 0.25s ease-out !important;
  opacity: 0 !important;
  transform: translateX(-15px) scale(0.95) !important;
}

.papercraft-card-deleted {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
  opacity: 0 !important;
  transform: scale(0.9) !important;
  pointer-events: none !important;
}

/* Phase 21: Table Generator & Draw.io UI */
.tbl-cell-input:focus {
  background: rgba(56, 189, 248, 0.15) !important;
  box-shadow: inset 0 0 0 1px #38bdf8;
}

.studio-title-block:hover .title-edit-pencil {
  opacity: 1 !important;
  color: #38bdf8;
}

/* Phase 22: Sleek Organized Card Buttons */
.papercraft-card-actions {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  margin-top: 14px !important;
}

.papercraft-card-actions .btn-papercraft-open {
  flex: 1 !important;
  min-width: 0 !important;
  white-space: nowrap !important;
  padding: 8px 12px !important;
  font-size: 12.5px !important;
  font-weight: 700 !important;
}

.papercraft-card-icon-actions {
  display: flex !important;
  align-items: center !important;
  gap: 5px !important;
  flex-shrink: 0 !important;
}

.card-icon-btn {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 33px !important;
  height: 33px !important;
  border-radius: var(--radius-sm, 6px) !important;
  background: var(--bg-hover, rgba(255, 255, 255, 0.05)) !important;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.12)) !important;
  color: var(--text-main, #f8fafc) !important;
  font-size: 13px !important;
  cursor: pointer !important;
  text-decoration: none !important;
  transition: all 0.15s ease !important;
  padding: 0 !important;
  flex-shrink: 0 !important;
}

.card-icon-btn:hover {
  background: rgba(99, 102, 241, 0.15) !important;
  border-color: rgba(99, 102, 241, 0.45) !important;
  transform: translateY(-1px) !important;
}

.card-icon-btn.card-pdf-btn {
  color: #10b981 !important;
  border-color: rgba(16, 185, 129, 0.3) !important;
}

.card-icon-btn.card-pdf-btn:hover {
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: #10b981 !important;
}

.card-icon-btn.card-delete-btn {
  color: #ef4444 !important;
  border-color: rgba(239, 68, 68, 0.25) !important;
}

.card-icon-btn.card-delete-btn:hover {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: #ef4444 !important;
}


/* Phase 23: GNUPlot Studio & Custom Right-Click Context Menu */
.papercraft-context-menu {
  background: var(--bg-card, #1e293b);
  border: 1px solid var(--border, #334155);
  border-radius: 8px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  padding: 6px;
  min-width: 190px;
  backdrop-filter: blur(8px);
}

.ctx-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-main, #f8fafc);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
  user-select: none;
}

.ctx-item:hover {
  background: var(--primary, #3b82f6);
  color: #ffffff;
}

.ctx-item.danger:hover {
  background: #ef4444 !important;
  color: #ffffff !important;
}

.ctx-divider {
  height: 1px;
  background: var(--border, #334155);
  margin: 5px 0;
}

.gp-subtab {
  color: var(--text-dim);
  border-bottom: 2px solid transparent !important;
  transition: all 0.15s;
}

.gp-subtab.active {
  color: #3b82f6 !important;
  border-bottom: 2px solid #3b82f6 !important;
  background: var(--bg-card) !important;
}

.studio-title-row:hover .title-edit-pencil {
  opacity: 1 !important;
  transform: scale(1.15);
}

/* Save Indicator Styles */
.studio-save-status {
  cursor: pointer;
  user-select: none;
}
.studio-save-status .save-dot {
  font-size: 9px;
  margin-right: 3px;
}
.studio-save-status.saved .save-dot {
  color: #10b981;
}
.studio-save-status.unsaved .save-dot {
  color: #f59e0b;
}
.studio-save-status.compiling .save-dot {
  color: #6366f1;
}


/* Universal select dropdown chevron fix: strictly 1 arrow, never repeating */
select, 
select.form-input, 
select.select-dropdown,
[data-theme="light"] select,
[data-theme="light"] select.form-input,
[data-theme="light"] select.select-dropdown,
[data-theme="dark"] select,
[data-theme="dark"] select.form-input,
[data-theme="dark"] select.select-dropdown {
  appearance: none !important;
  -webkit-appearance: none !important;
  -moz-appearance: none !important;
  background-repeat: no-repeat !important;
  background-position: right 10px center !important;
  background-size: 14px 14px !important;
  padding-right: 32px !important;
}

/* ==========================================================================
   Comprehensive Mobile App & Mobile Browser View Enhancements
   ========================================================================== */
@media (max-width: 900px) {
  .papercraft-studio-topbar {
    padding: 0 8px !important;
    height: 48px !important;
  }
  .desktop-only-text {
    display: none !important;
  }
  .studio-title-block {
    max-width: 140px !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    white-space: nowrap !important;
  }
  .papercraft-menu-drawer {
    width: 320px !important;
    max-width: 88vw !important;
  }
}

@media (max-width: 640px) {
  .papercraft-studio-topbar {
    padding: 0 4px !important;
    gap: 3px !important;
  }
  .btn-topbar-subtle, .studio-tool-btn, .studio-icon-btn {
    padding: 4px 6px !important;
    min-width: 34px !important;
    height: 34px !important;
    font-size: 13px !important;
  }
  .studio-title-block {
    display: none !important;
  }
  .btn-papercraft-share-topbar span {
    display: none !important;
  }
  .btn-papercraft-share-topbar {
    padding: 6px 8px !important;
  }
  .overleaf-segmented-group {
    padding: 2px !important;
  }
  .overleaf-segmented-group .segmented-item {
    padding: 4px 6px !important;
  }
  /* Modals full screen on small mobile screens */
  .modal-dialog-large, .modal-dialog-xlarge, .overleaf-modal-dialog {
    width: 98vw !important;
    max-width: 98vw !important;
    height: 94vh !important;
    max-height: 94vh !important;
    margin: 3vh auto !important;
    border-radius: 8px !important;
  }
  .modal-papercraft-dialog-full {
    width: 99vw !important;
    height: 96vh !important;
    margin: 2vh auto !important;
  }
  /* Mobile drawer full touch targets */
  .menu-list-btn, .menu-action-btn {
    min-height: 48px !important;
    padding: 10px 12px !important;
  }
  .menu-list-btn .btn-icon {
    font-size: 18px !important;
    width: 28px !important;
    text-align: center;
  }
}

/* ==========================================================================
   Grammarly & AI Proofreader Drawer (Chrome Extension Integration)
   ========================================================================== */
.papercraft-grammarly-drawer {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 480px;
  max-width: 90vw;
  background: var(--bg-card, #ffffff);
  border-left: 1px solid var(--border, #e2e8f0);
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  z-index: 1050;
  transform: translateX(100%);
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.papercraft-grammarly-drawer.open {
  transform: translateX(0);
}

.grammarly-drawer-header {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border, #e2e8f0);
  background: var(--bg-card, #ffffff);
  flex-shrink: 0;
}

.grammarly-drawer-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 14px;
  overflow: hidden;
  gap: 10px;
}

.grammarly-content-editor {
  flex: 1;
  width: 100%;
  border: 1px solid var(--border, #cbd5e1);
  border-radius: 8px;
  padding: 12px;
  font-family: var(--font-main, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-main, #1e293b);
  background: var(--bg-card, #ffffff);
  overflow-y: auto;
  outline: none;
  resize: none;
  white-space: pre-wrap;
  word-break: break-word;
}

.grammarly-content-editor:focus {
  border-color: #10b981;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

.grammarly-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.12);
  color: #059669;
  font-size: 11px;
  font-weight: 600;
}

/* ==========================================================================
   UNIFIED GRAMMARLY-ENABLED LATEX EDITOR
   ========================================================================== */

.papercraft-main-editor-container {
  display: flex;
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 0;
  position: relative;
  background: var(--bg-card);
  overflow: hidden;
}

.editor-gutter {
  width: 46px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  color: var(--text-dim);
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13.5px;
  line-height: 1.6;
  text-align: right;
  padding: 14px 10px 14px 0;
  box-sizing: border-box;
  user-select: none;
  overflow: hidden;
  flex-shrink: 0;
  opacity: 0.65;
}

.editor-gutter > div {
  height: 21.6px;
  line-height: 21.6px;
}

.papercraft-main-editor {
  flex: 1;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
  resize: none;
  outline: none;
  border: none;
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13.5px;
  line-height: 1.6;
  tab-size: 2;
  padding: 14px 20px 80px 18px;
  background: transparent !important;
  color: var(--text-main);
  overflow-y: auto;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  position: relative;
  z-index: 1;
}

.papercraft-main-editor::placeholder {
  color: var(--text-dim);
  font-style: italic;
  opacity: 0.6;
}

/* Ensure Grammarly extension overlays, mirror highlights and popup cards render on top */
grammarly-extension,
.grammarly-extension,
grammarly-mirror {
  position: absolute !important;
  z-index: 100 !important;
}

grammarly-popups,
.grammarly-desktop-integration-overlay,
[data-grammarly-part="card"] {
  z-index: 999999 !important;
}

/* Grammarly live indicator in the tab bar */
.grammarly-live-indicator {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-dim);
  border-radius: 4px;
}

.g-pill-dot {
  font-size: 9px;
  color: #10b981;
  line-height: 1;
  margin-left: 2px;
  animation: g-pulse 2s ease-in-out infinite;
}

@keyframes g-pulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

.btn-syntax-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-dim);
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-syntax-toggle:hover {
  color: var(--text-main);
  border-color: #3b82f6;
  background: var(--bg-hover);
}

.btn-syntax-toggle.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: #3b82f6;
  color: #3b82f6;
}

/* ==========================================================================
   OFFLINE GRAMMARLY-EQUIVALENT ENGINE UI
   ========================================================================== */

/* Floating Grammarly-style circular/pill badge at bottom-right of editor */
.papercraft-grammar-badge {
  position: absolute;
  right: 24px;
  bottom: 22px;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border-radius: 30px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  background: var(--bg-card, #ffffff);
  border: 1.5px solid #10b981;
  color: #10b981;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.16);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.papercraft-grammar-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.22);
}

.papercraft-grammar-badge.has-issues {
  border-color: #ef4444;
  color: #ef4444;
  background: var(--bg-card);
}

.papercraft-grammar-badge .badge-icon {
  font-size: 14px;
}

.papercraft-grammar-badge .badge-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 10px;
  background: #ef4444;
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
}

.papercraft-grammar-badge.checking .badge-icon {
  display: inline-block;
  animation: g-spin 1s linear infinite;
}

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

/* 1-Click Suggestion Card (Floating Popover) */
.grammar-suggestion-card {
  position: fixed;
  z-index: 10000;
  width: 290px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
  padding: 12px 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  animation: card-appear 0.18s ease-out;
}

@keyframes card-appear {
  from { opacity: 0; transform: scale(0.95) translateY(4px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.grammar-suggestion-card .card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.card-type-badge {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
}

.card-type-badge.grammar {
  background: rgba(245, 158, 11, 0.12);
  color: #f59e0b;
}

.card-close-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 16px;
  cursor: pointer;
  line-height: 1;
  padding: 0 2px;
}

.card-close-btn:hover {
  color: var(--text-main);
}

.card-message {
  font-size: 12.5px;
  color: var(--text-dim);
  line-height: 1.45;
  margin-bottom: 10px;
}

.card-suggestions-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 10px;
}

.card-suggestion-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 11px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 6px;
  color: #10b981;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
}

.card-suggestion-btn:hover {
  background: #10b981;
  color: #ffffff;
  border-color: #10b981;
  transform: translateX(2px);
}

.card-suggestion-btn::after {
  content: '✓ Accept';
  font-size: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  opacity: 0.8;
}

.card-footer {
  display: flex;
  justify-content: flex-end;
  border-top: 1px solid var(--border);
  padding-top: 8px;
}

.card-btn-dismiss {
  background: none;
  border: none;
  font-size: 11.5px;
  color: var(--text-dim);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.card-btn-dismiss:hover {
  color: var(--text-main);
  background: var(--bg-hover);
}

/* Grammarly Issues Summary Panel (Slide-up) */
.grammar-issues-panel {
  position: absolute;
  right: 24px;
  bottom: 66px;
  z-index: 500;
  width: 330px;
  max-height: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: card-appear 0.2s ease-out;
}

.grammar-issues-panel .panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
}

.grammar-issues-panel .panel-title {
  font-size: 12.5px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
}

.panel-close-btn {
  background: none;
  border: none;
  font-size: 16px;
  color: var(--text-dim);
  cursor: pointer;
}

.grammar-issues-panel .panel-body {
  padding: 8px;
  overflow-y: auto;
  max-height: 320px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.grammar-issue-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 10px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.grammar-issue-item:hover {
  border-color: #ef4444;
  background: var(--bg-hover);
}

.issue-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
}

.issue-word {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-weight: 700;
  color: #ef4444;
}

.issue-line-badge {
  font-size: 10px;
  color: var(--text-dim);
}

.issue-message {
  font-size: 11.5px;
  color: var(--text-dim);
  line-height: 1.35;
}

.panel-empty {
  padding: 24px 14px;
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
}

/* Ace Editor Grammar and Spelling Markers */
.ace_grammar_squiggle {
  position: absolute;
  border-bottom: 2px wavy #ef4444 !important;
  background: rgba(239, 68, 68, 0.08) !important;
  border-radius: 2px;
  z-index: 20;
  cursor: pointer;
}

.ace_grammar_warning {
  position: absolute;
  border-bottom: 2px wavy #f59e0b !important;
  background: rgba(245, 158, 11, 0.08) !important;
  border-radius: 2px;
  z-index: 20;
  cursor: pointer;
}

.ace_grammar_clarity {
  position: absolute;
  border-bottom: 2px wavy #3b82f6 !important;
  background: rgba(59, 130, 246, 0.08) !important;
  border-radius: 2px;
  z-index: 20;
  cursor: pointer;
}

.log-file-badge {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  font-weight: 600;
  margin-left: 6px;
}