/* ==========================================================================
   Design Tokens & CSS Variables (Dark & Light Modes)
   ========================================================================== */
:root {
  /* Common Palette */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'Fira Code', Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;

  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.15);
  
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;

  --sidebar-width: 320px;
  --header-height: 60px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Dark Theme (Default) */
body.dark-theme {
  --bg-app: #090d16;
  --bg-sidebar: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #1e293b;
  --bg-pane: #0f172a;
  --bg-header: rgba(15, 23, 42, 0.85);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-color: #334155;
  --border-subtle: #1e293b;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);

  --code-bg: #1e293b;
  --quote-bg: rgba(99, 102, 241, 0.08);
  --table-border: #334155;
  --table-stripe: rgba(255,255,255,0.02);
  --annotation-mark: rgba(245, 158, 11, 0.35);
}

/* Light Theme */
body.light-theme {
  --bg-app: #f8fafc;
  --bg-sidebar: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  --bg-pane: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.85);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.12);

  --code-bg: #f1f5f9;
  --quote-bg: rgba(99, 102, 241, 0.06);
  --table-border: #e2e8f0;
  --table-stripe: #f8fafc;
  --annotation-mark: rgba(254, 240, 138, 0.8);
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  -webkit-tap-highlight-color: transparent;
}

code, textarea, .code-font {
  font-family: var(--font-mono);
}

.app-layout {
  display: flex;
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

/* Buttons & UI Elements */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.btn-subtle {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-subtle:hover {
  color: var(--text-primary);
  background-color: var(--accent-light);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.mb-3 { margin-bottom: 12px; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-primary);
  background-color: var(--accent-light);
}

/* ==========================================================================
   Feature 1: Left Sidebar & Desktop Collapse Toggle
   ========================================================================== */
.sidebar {
  width: var(--sidebar-width);
  height: 100%;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform var(--transition-normal), opacity 0.25s ease;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

/* Desktop Collapsed State */
.sidebar.collapsed {
  width: 0 !important;
  opacity: 0;
  pointer-events: none;
  border-right: none;
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
  user-select: none;
  cursor: pointer;
}

.brand-logo-wrapper {
  position: relative;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-logo-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 8px rgba(0, 242, 254, 0.25));
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.3s ease;
}

.brand:hover .brand-logo-svg {
  transform: scale(1.08) rotate(-2deg);
  filter: drop-shadow(0 4px 14px rgba(0, 242, 254, 0.45));
}

.logo-pulse-ring {
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 16px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.2) 0%, rgba(99, 102, 241, 0) 70%);
  animation: cyberPulse 3s infinite ease-in-out;
  pointer-events: none;
  z-index: -1;
}

@keyframes cyberPulse {
  0%, 100% { opacity: 0.4; transform: scale(0.95); }
  50% { opacity: 0.9; transform: scale(1.1); }
}

.brand-text-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title {
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.text-gradient {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.brand-badge-tech {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 1px 6px;
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(99, 102, 241, 0.2));
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.4);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.2);
  text-transform: uppercase;
}

.sidebar-toggle-group {
  display: flex;
  align-items: center;
}

.close-sidebar-btn {
  display: none; /* Desktop hidden */
}

.sidebar-actions,
.sidebar-actions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 14px 16px;
  flex-shrink: 0;
}

.sidebar-actions-grid .btn {
  padding: 8px 10px;
  font-size: 0.84rem;
  white-space: nowrap;
}

.search-box {
  position: relative;
  margin: 0 16px 12px 16px;
  flex-shrink: 0;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.search-box input {
  width: 100%;
  padding: 8px 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--accent-color);
}

.clear-search-btn {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

.file-list-container {
  flex: 1;
  overflow-y: auto;
  padding: 0 12px 16px 12px;
}

.file-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.file-list-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-new-folder {
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.file-count {
  background-color: var(--accent-light);
  color: var(--accent-color);
  padding: 2px 6px;
  border-radius: 10px;
}

.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* ==========================================================================
   Folder Group & Tree Components
   ========================================================================== */
.folder-group {
  margin-bottom: 4px;
}

.folder-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
}

.folder-header:hover {
  background-color: var(--accent-light);
  border-color: rgba(99, 102, 241, 0.2);
}

.folder-header-main {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.folder-chevron {
  font-size: 0.72rem;
  color: var(--text-muted);
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.folder-group.collapsed .folder-chevron {
  transform: rotate(-90deg);
}

.folder-icon-badge {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.84rem;
  flex-shrink: 0;
  background: rgba(99, 102, 241, 0.15);
  box-shadow: 0 0 8px rgba(99, 102, 241, 0.15);
  transition: all var(--transition-fast);
}

.folder-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.folder-count-badge {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 1px 6px;
  border-radius: 10px;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.folder-action-btn {
  opacity: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.76rem;
  transition: all var(--transition-fast);
}

.folder-header:hover .folder-action-btn {
  opacity: 1;
}

.folder-action-btn:hover {
  color: var(--accent-color);
  background-color: var(--accent-light);
}

.folder-file-list {
  list-style: none;
  padding-left: 12px;
  margin-top: 2px;
  border-left: 2px solid var(--border-color);
  margin-left: 14px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: all var(--transition-fast);
}

.folder-group.collapsed .folder-file-list {
  display: none;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.file-item.nested-file {
  padding: 8px 10px;
}

.file-item:hover {
  background-color: var(--accent-light);
}

.file-item.active {
  background-color: var(--accent-light);
  border-color: rgba(99, 102, 241, 0.4);
}

.file-item-main {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  overflow: hidden;
  flex: 1;
}

.file-item-icon-box {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.file-item-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

.file-action-btn {
  opacity: 0;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.76rem;
  transition: all var(--transition-fast);
}

.file-item:hover .file-action-btn,
.file-item:hover .delete-file-btn {
  opacity: 1;
}

.file-action-btn:hover {
  color: var(--accent-color);
  background-color: var(--accent-light);
}

.file-item-icon {
  margin-top: 3px;
  color: var(--accent-color);
  font-size: 1rem;
  flex-shrink: 0;
}

.file-item-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.file-item-name {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-item-time {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.file-item-badge {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--warning-color);
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 8px;
  margin-left: 6px;
}

.file-item-actions {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.delete-file-btn {
  color: var(--text-muted);
  padding: 4px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.delete-file-btn:hover {
  color: var(--danger-color);
}

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.storage-info code {
  background-color: var(--bg-input);
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--accent-color);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.5);
  backdrop-filter: blur(3px);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-app);
}

.top-navbar {
  height: var(--header-height);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-header);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
}

.active-file-info {
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.active-file-icon {
  font-size: 1.1rem;
  color: var(--accent-color);
  flex-shrink: 0;
}

.active-file-title {
  font-size: 1rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.active-file-title:hover {
  color: var(--accent-color);
}

.btn-inline-action {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0.7;
  transition: all var(--transition-fast);
}

.btn-inline-action:hover {
  opacity: 1;
  color: var(--accent-color);
  background-color: var(--accent-light);
}

.save-status-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 12px;
  font-weight: 500;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.status-saved {
  background-color: rgba(16, 185, 129, 0.12);
  color: var(--success-color);
}

.status-saving {
  background-color: rgba(245, 158, 11, 0.12);
  color: var(--warning-color);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.segmented-control {
  display: flex;
  background-color: var(--bg-input);
  padding: 3px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.segmented-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.segmented-btn:hover {
  color: var(--text-primary);
}

.segmented-btn.active {
  background-color: var(--accent-color);
  color: #ffffff;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* View Container */
.view-container {
  flex: 1;
  display: flex;
  height: calc(100vh - var(--header-height));
  overflow: hidden;
  position: relative;
}

.pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--bg-pane);
  overflow: hidden;
}

.pane-header {
  height: 42px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.pane-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.pane-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.editor-pane {
  border-right: 1px solid var(--border-color);
}

/* Markdown Quick Editing Toolbar */
.md-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  padding: 6px 12px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  user-select: none;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.toolbar-divider {
  width: 1px;
  height: 16px;
  background-color: var(--border-color);
  margin: 0 4px;
}

.toolbar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toolbar-btn:hover {
  color: var(--text-primary);
  background-color: var(--accent-light);
  border-color: rgba(99, 102, 241, 0.25);
}

.toolbar-btn:active {
  transform: scale(0.92);
}

.editor-wrapper {
  flex: 1;
  position: relative;
}

#editor {
  width: 100%;
  height: 100%;
  padding: 16px 20px;
  border: none;
  outline: none;
  resize: none;
  background-color: transparent;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.6;
  tab-size: 2;
}

.preview-workspace {
  flex: 1;
  display: flex;
  height: calc(100% - 42px);
  position: relative;
  overflow: hidden;
}

.preview-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px;
  height: 100%;
}

/* Feature 3: Live Direct HTML Editing Styling */
.live-edit-btn.active {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--success-color);
  border-color: rgba(16, 185, 129, 0.4);
}

.markdown-body.html-live-editing [contenteditable="true"] {
  outline: 1px dashed rgba(99, 102, 241, 0.4);
  outline-offset: 3px;
  border-radius: 4px;
  cursor: text;
  transition: outline 0.15s ease, background-color 0.15s ease;
}

.markdown-body.html-live-editing [contenteditable="true"]:hover {
  outline: 1px dashed var(--accent-color);
  background-color: rgba(99, 102, 241, 0.05);
}

.markdown-body.html-live-editing [contenteditable="true"]:focus {
  outline: 2px solid var(--accent-color);
  background-color: rgba(99, 102, 241, 0.08);
}

/* Feature 2: Annotations Panel & Mark Highlighting */
mark.md-annotation {
  background-color: var(--annotation-mark);
  color: inherit;
  padding: 2px 4px;
  border-radius: 3px;
  border-bottom: 2px solid var(--warning-color);
  cursor: pointer;
  position: relative;
}

mark.md-annotation:hover {
  filter: brightness(1.1);
}

.annotation-badge {
  background-color: var(--warning-color);
  color: #000;
  font-weight: 700;
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 10px;
}

.annotations-panel {
  width: 300px;
  height: 100%;
  background-color: var(--bg-card);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: absolute;
  right: 0;
  top: 0;
  z-index: 20;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.annotations-panel.open {
  transform: translateX(0);
}

.annotations-header {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.annotations-header h3 {
  font-size: 0.92rem;
  font-weight: 600;
}

.annotations-body {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.annotation-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.annotation-card {
  background-color: var(--bg-pane);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color var(--transition-fast);
}

.annotation-card:hover {
  border-color: var(--accent-color);
}

.annotation-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.annotation-author {
  font-weight: 600;
  color: var(--accent-color);
}

.annotation-quote {
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-left: 3px solid var(--warning-color);
  padding-left: 8px;
  margin: 4px 0;
  font-style: italic;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.annotation-comment {
  font-size: 0.86rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.delete-annotation-btn {
  color: var(--text-muted);
  border: none;
  background: none;
  cursor: pointer;
}
.delete-annotation-btn:hover { color: var(--danger-color); }

.selection-annotation-popover {
  position: absolute;
  z-index: 500;
  transform: translate(-50%, -100%);
  margin-top: -8px;
  box-shadow: var(--shadow-md);
}

.selected-text-box {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-height: 80px;
  overflow-y: auto;
  font-style: italic;
}

/* Layout Modes */
.view-container.mode-preview .editor-pane { display: none; }
.view-container.mode-preview .preview-pane { flex: 1; }

.view-container.mode-editor .preview-pane { display: none; }
.view-container.mode-editor .editor-pane { flex: 1; border-right: none; }

/* Markdown Body Styles */
.markdown-body {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.7;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin-top: 1.4em;
  margin-bottom: 0.6em;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

.markdown-body h1 { font-size: 1.85rem; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.45rem; border-bottom: 1px solid var(--border-subtle); padding-bottom: 0.2em; }
.markdown-body h3 { font-size: 1.22rem; }
.markdown-body h4 { font-size: 1.05rem; }

.markdown-body p { margin-bottom: 1em; }

.markdown-body a {
  color: var(--accent-color);
  text-decoration: none;
}
.markdown-body a:hover { text-decoration: underline; }

.markdown-body ul, .markdown-body ol {
  padding-left: 1.6em;
  margin-bottom: 1em;
}

.markdown-body li { margin-bottom: 0.3em; }

.markdown-body blockquote {
  padding: 10px 16px;
  margin-bottom: 1em;
  background-color: var(--quote-bg);
  border-left: 4px solid var(--accent-color);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.markdown-body code:not(pre code) {
  padding: 2px 6px;
  font-size: 0.88em;
  background-color: var(--code-bg);
  color: var(--accent-color);
  border-radius: 4px;
}

.markdown-body pre {
  margin-bottom: 1em;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.markdown-body pre code {
  display: block;
  padding: 16px;
  font-size: 0.9em;
  overflow-x: auto;
  line-height: 1.5;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.2em;
  font-size: 0.92rem;
}

.markdown-body th, .markdown-body td {
  padding: 10px 14px;
  border: 1px solid var(--table-border);
  text-align: left;
}

.markdown-body th { background-color: var(--bg-card); font-weight: 600; }
.markdown-body tr:nth-child(even) { background-color: var(--table-stripe); }

.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 1em 0;
}

.markdown-body hr {
  height: 1px;
  background-color: var(--border-color);
  border: none;
  margin: 1.5em 0;
}

/* Modals & Toasts */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: 20px;
}

.modal-overlay.active { opacity: 1; visibility: visible; }

.modal-card {
  width: 100%;
  max-width: 620px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-card { transform: translateY(0); }

.modal-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-header h3 { font-size: 1.1rem; font-weight: 600; }
.text-accent { color: var(--accent-color); }

.modal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quick-actions { display: flex; gap: 10px; }

.btn-text-action {
  background: none;
  border: none;
  color: var(--accent-color);
  font-size: 0.8rem;
  cursor: pointer;
}
.btn-text-action:hover { text-decoration: underline; }

.form-control {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-control:focus { border-color: var(--accent-color); }

.modal-footer {
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  background-color: var(--bg-pane);
  border-top: 1px solid var(--border-subtle);
}

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
  animation: slideInRight 0.3s ease;
}

.toast-success i { color: var(--success-color); }
.toast-error i { color: var(--danger-color); }

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ==========================================================================
   Export / Download Dropdown Menu & Quick Action Styles
   ========================================================================== */
.dropdown-container {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 320px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  overflow: hidden;
}

.dropdown-container.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.dropdown-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-pane);
}

.dropdown-items {
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-primary);
}

.dropdown-item:hover {
  background-color: var(--accent-light);
  border-color: rgba(99, 102, 241, 0.2);
}

.item-icon-box {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.item-icon-html {
  background: rgba(228, 77, 38, 0.15);
  color: #e44d26;
}

.item-icon-md {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-color);
}

.item-icon-raw {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success-color);
}

.item-icon-json {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning-color);
}

.item-content {
  flex: 1;
  min-width: 0;
}

.item-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.item-desc {
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.badge-pill {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 10px;
  line-height: 1;
}

.badge-primary {
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--accent-color);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--success-color);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.2);
  color: var(--warning-color);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.item-icon-image {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning-color);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-subtle);
  margin: 4px 6px;
}

/* ==========================================================================
   New Document Template Cards
   ========================================================================== */
.modal-card-lg {
  max-width: 720px;
}

.template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.template-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-pane);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.template-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.template-card.active {
  border-color: var(--accent-color);
  background-color: var(--accent-light);
  box-shadow: 0 0 0 1px var(--accent-color);
}

.template-icon {
  font-size: 1.3rem;
  color: var(--accent-color);
  padding-top: 2px;
  flex-shrink: 0;
}

.template-info {
  flex: 1;
  min-width: 0;
}

.template-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.template-desc {
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* ==========================================================================
   Export Image Modal & Preview
   ========================================================================== */
.modal-card-xl {
  max-width: 920px;
  max-height: 90vh;
}

.export-image-modal-body {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow: hidden;
  max-height: calc(90vh - 130px);
}

.image-export-settings {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background-color: var(--bg-pane);
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.setting-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.setting-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.setting-item label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-group-segmented {
  display: inline-flex;
  padding: 2px;
  background-color: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.btn-seg {
  padding: 4px 10px;
  font-size: 0.78rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-seg:hover {
  color: var(--text-primary);
}

.btn-seg.active {
  background-color: var(--accent-color);
  color: #ffffff;
  font-weight: 500;
}

.setting-toggles {
  gap: 16px;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent-color);
  cursor: pointer;
}

.image-preview-container {
  flex: 1;
  min-height: 280px;
  max-height: 480px;
  overflow-y: auto;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: repeating-conic-gradient(#1e293b 0% 25%, #0f172a 0% 50%) 50% / 20px 20px;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  position: relative;
}

body.light-theme .image-preview-container {
  background: repeating-conic-gradient(#e2e8f0 0% 25%, #f8fafc 0% 50%) 50% / 20px 20px;
}

.image-preview-wrapper {
  max-width: 100%;
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

#imagePreviewElement {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.image-loading-state {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #ffffff;
  font-size: 0.9rem;
  z-index: 10;
}

.image-modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.image-footer-info {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.image-footer-actions {
  display: flex;
  gap: 10px;
}

/* ==========================================================================
   Offscreen Image Capture Styling (Pixel-Perfect DOM Container)
   ========================================================================== */
.export-img-canvas-wrapper {
  width: 820px;
  box-sizing: border-box;
  padding: 40px 48px;
  font-family: var(--font-sans);
  border-radius: 12px;
}

.export-img-canvas-wrapper.theme-dark {
  background-color: #0f172a;
  color: #f8fafc;
}

.export-img-canvas-wrapper.theme-light {
  background-color: #ffffff;
  color: #0f172a;
}

.export-img-header {
  border-bottom: 2px solid rgba(99, 102, 241, 0.3);
  padding-bottom: 20px;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.export-img-title {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.export-img-badge {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(99, 102, 241, 0.15);
  color: #6366f1;
  font-weight: 600;
}

.export-img-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding-top: 18px;
  margin-top: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: #94a3b8;
}

/* ==========================================================================
   Custom Icon & Color Picker Modal
   ========================================================================== */
.icon-picker-hero {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  background-color: var(--bg-pane);
  border: 1px solid var(--border-color);
}

.icon-hero-badge {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: rgba(99, 102, 241, 0.2);
  color: #6366f1;
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.3);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.icon-hero-info {
  flex: 1;
}

.icon-hero-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.icon-hero-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.color-palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 8px;
}

.color-chip {
  width: 100%;
  height: 36px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.color-chip:hover {
  transform: scale(1.1);
  box-shadow: 0 0 10px var(--chip-color, rgba(99, 102, 241, 0.5));
}

.color-chip.active {
  border-color: #ffffff;
  transform: scale(1.05);
  box-shadow: 0 0 12px var(--chip-color, rgba(99, 102, 241, 0.6));
}

.color-chip.active::after {
  content: '✓';
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: bold;
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
}

.icon-category-tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.category-tab {
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.category-tab:hover {
  color: var(--text-primary);
  border-color: var(--accent-color);
}

.category-tab.active {
  background-color: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
  gap: 8px;
  max-height: 210px;
  overflow-y: auto;
  padding: 4px;
  background-color: var(--bg-pane);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.icon-pick-btn {
  width: 100%;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1.15rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.icon-pick-btn:hover {
  color: var(--accent-color);
  border-color: var(--accent-color);
  transform: translateY(-2px);
  background-color: var(--accent-light);
}

.icon-pick-btn.active {
  color: #ffffff;
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.custom-icon-preview-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background-color: var(--bg-pane);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.icon-badge-preview {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  background: rgba(99, 102, 241, 0.15);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

.icon-preview-details {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
}

.icon-preview-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.form-row-2 {
  display: flex;
  gap: 12px;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

.annotations-action-group {
  display: flex;
  flex-direction: column;
}

.mb-2 { margin-bottom: 8px; }

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open { transform: translateX(0); }

  .sidebar-overlay.active { opacity: 1; visibility: visible; }
  .close-sidebar-btn { display: inline-flex; }
  .collapse-sidebar-btn { display: none; }

  .top-navbar { padding: 0 12px; }
  .btn-text { display: none; }
  .preview-wrapper { padding: 16px; }

  .view-container.mode-split { flex-direction: column; }
  .view-container.mode-split .editor-pane,
  .view-container.mode-split .preview-pane {
    height: 50%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }

  .annotations-panel {
    width: 100%;
  }

  .dropdown-menu {
    right: -50px;
    width: 290px;
  }
}