/* ==========================================================================
   FolioMD — Dark-Theme PDF-Style Markdown & Folder Viewer
   ========================================================================== */

:root {
  /* Core Dark Palette */
  --bg-canvas: #080a0f;
  --bg-app: #0b0e14;
  --bg-toolbar: #0e121a;
  --bg-sidebar: #0f131c;
  --bg-sheet: #131824;
  --bg-elevated: #181f2e;
  --bg-hover: rgba(255, 255, 255, 0.05);
  --bg-active: rgba(99, 102, 241, 0.14);
  --bg-code: #0b0e16;

  /* Borders */
  --border-subtle: #1b2232;
  --border-default: #232c40;
  --border-strong: #313d57;
  --border-accent: rgba(99, 102, 241, 0.45);

  /* Text Colors */
  --text-primary: #eef2f9;
  --text-secondary: #a2aec6;
  --text-muted: #687590;
  --text-accent: #818cf8;

  /* Accents */
  --accent-primary: #6366f1;
  --accent-primary-hover: #818cf8;
  --accent-folder: #8b5cf6;
  --accent-file: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  --accent-info: #38bdf8;

  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Newsreader', Georgia, Cambria, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

  /* Dimensions */
  --toolbar-height: 48px;
  --statusbar-height: 26px;
  --left-sidebar-width: 272px;
  --right-sidebar-width: 284px;

  /* Shadows */
  --shadow-sheet: 0 18px 50px rgba(0, 0, 0, 0.65), 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-modal: 0 24px 64px rgba(0, 0, 0, 0.78);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  width: 100%;
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

button, input, select, textarea {
  font-family: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.36;
}

.hidden {
  display: none !important;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: rgba(162, 174, 198, 0.16);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(162, 174, 198, 0.3);
}

/* View Containers */
.view-container {
  display: none;
  width: 100%;
  height: 100vh;
  height: 100dvh;
}

.view-container.active {
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   BUTTONS & COMMON UI
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 13px;
  transition: all 0.16s ease;
  white-space: nowrap;
}

.btn-sm {
  padding: 6px 11px;
  font-size: 12.5px;
}

.btn-primary {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.32);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: #20293d;
  border-color: var(--border-strong);
}

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

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

/* Global Drag & Drop Overlay */
.dropzone-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(8, 10, 15, 0.82);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.dropzone-modal {
  background: var(--bg-sheet);
  border: 2px dashed var(--accent-primary);
  border-radius: 18px;
  padding: 48px 64px;
  text-align: center;
  box-shadow: var(--shadow-modal);
  animation: pulseBorder 1.8s infinite ease-in-out;
}

.dropzone-icon-wrap {
  width: 72px;
  height: 72px;
  margin: 0 auto 16px;
  border-radius: 18px;
  background: rgba(99, 102, 241, 0.14);
  color: var(--text-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.dropzone-modal h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 6px;
}

.dropzone-modal p {
  color: var(--text-secondary);
  font-size: 14px;
}

@keyframes pulseBorder {
  0%, 100% { border-color: rgba(99, 102, 241, 0.6); }
  50% { border-color: rgba(129, 140, 248, 1); }
}

/* ==========================================================================
   VIEW 1: HOMEPAGE
   ========================================================================== */
#home-view {
  overflow-y: auto;
  background:
    radial-gradient(circle at 20% 0%, rgba(99, 102, 241, 0.11), transparent 42%),
    radial-gradient(circle at 80% 5%, rgba(16, 185, 129, 0.08), transparent 40%),
    var(--bg-app);
}

.home-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 14, 20, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.home-header-inner {
  max-width: 1020px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 11px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.22), rgba(139, 92, 246, 0.18));
  border: 1px solid rgba(129, 140, 248, 0.35);
  color: var(--text-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-text {
  display: flex;
  align-items: center;
  gap: 9px;
}

.brand-name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.14);
  color: var(--text-accent);
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.home-header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cache-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-sheet);
  border: 1px solid var(--border-subtle);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

.home-main {
  max-width: 1020px;
  width: 100%;
  margin: 0 auto;
  padding: 38px 24px 72px;
  display: flex;
  flex-direction: column;
  gap: 44px;
}

/* Hero Section */
.hero-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-heading {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.hero-heading h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
  background: linear-gradient(180deg, #ffffff 0%, #b8c4dc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-heading p {
  color: var(--text-secondary);
  font-size: 14.5px;
  line-height: 1.6;
}

/* Open Action Cards Grid */
.open-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.open-action-card {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 24px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(24, 31, 46, 0.78) 0%, rgba(19, 24, 36, 0.92) 100%);
  border: 1px solid var(--border-default);
  text-align: left;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}

.open-action-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(99, 102, 241, 0.22);
}

.open-file-card:hover {
  border-color: rgba(16, 185, 129, 0.45);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(16, 185, 129, 0.22);
}

.open-card-icon {
  flex-shrink: 0;
  width: 54px;
  height: 54px;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.open-card-icon.folder-accent {
  background: rgba(139, 92, 246, 0.14);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.open-card-icon.file-accent {
  background: rgba(16, 185, 129, 0.13);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.28);
}

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

.open-card-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}

.open-card-title-row h2 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}

.open-card-shortcut {
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.open-card-content p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 14px;
}

.open-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-accent);
}

.open-file-card .open-card-cta {
  color: #34d399;
}

.open-action-card:hover .open-card-cta svg {
  transform: translateX(3px);
}

.open-card-cta svg {
  transition: transform 0.18s ease;
}

/* Feature Pills */
.feature-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--text-secondary);
  background: rgba(19, 24, 36, 0.75);
  border: 1px solid var(--border-subtle);
}

.feature-pill svg {
  color: var(--text-accent);
}

/* Recent Section */
.recent-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: rgba(15, 19, 28, 0.72);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 22px;
}

.recent-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.recent-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.recent-title-group h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.recent-title-group h2 svg {
  color: var(--text-accent);
}

.recent-count-badge {
  font-size: 11.5px;
  font-weight: 500;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

.recent-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.recent-tabs {
  display: inline-flex;
  background: var(--bg-app);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
}

.recent-tab {
  padding: 4px 11px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.recent-tab:hover {
  color: var(--text-primary);
}

.recent-tab.active {
  background: var(--bg-elevated);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

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

.recent-search-wrap svg {
  position: absolute;
  left: 10px;
  color: var(--text-muted);
  pointer-events: none;
}

.recent-search-wrap input {
  background: var(--bg-app);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 6px 11px 6px 30px;
  font-size: 12.5px;
  color: var(--text-primary);
  width: 190px;
  transition: border-color 0.15s ease, width 0.2s ease;
}

.recent-search-wrap input:focus {
  outline: none;
  border-color: var(--accent-primary);
  width: 220px;
}

/* Recent Items Grid */
.recent-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 12px;
}

.recent-item-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 13px;
  padding: 14px 15px;
  border-radius: 11px;
  background: var(--bg-sheet);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all 0.16s ease;
}

.recent-item-card:hover {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.recent-item-icon {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.recent-item-icon.type-folder {
  background: rgba(139, 92, 246, 0.14);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.26);
}

.recent-item-icon.type-file {
  background: rgba(16, 185, 129, 0.13);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.26);
}

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

.recent-item-top {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 3px;
}

.recent-item-name {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.recent-type-pill {
  flex-shrink: 0;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 1px 6px;
  border-radius: 4px;
}

.recent-type-pill.folder {
  background: rgba(139, 92, 246, 0.16);
  color: #c4b5fd;
}

.recent-type-pill.file {
  background: rgba(16, 185, 129, 0.16);
  color: #6ee7b7;
}

.recent-item-meta {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
}

.recent-item-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
}

.recent-cache-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #93c5fd;
}

.recent-item-actions {
  display: flex;
  align-items: center;
  gap: 3px;
}

.recent-action-btn {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.14s ease;
}

.recent-action-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.recent-action-btn.pinned {
  color: #fbbf24;
}

.recent-action-btn.delete:hover {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
}

/* Empty State */
.recent-empty-state {
  padding: 40px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.empty-state-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--bg-sheet);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 4px;
}

.recent-empty-state h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.recent-empty-state p {
  font-size: 13px;
  color: var(--text-secondary);
  max-width: 440px;
  margin-bottom: 6px;
}

/* ==========================================================================
   VIEW 2: MARKDOWN PDF VIEWER PAGE
   ========================================================================== */

/* Top PDF Viewer Toolbar */
.viewer-toolbar {
  height: var(--toolbar-height);
  flex-shrink: 0;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  user-select: none;
  z-index: 30;
}

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

.toolbar-left {
  flex: 1;
  min-width: 0;
}

.toolbar-center {
  flex-shrink: 0;
}

.toolbar-right {
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}

.toolbar-icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.14s ease;
  flex-shrink: 0;
}

.toolbar-icon-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.toolbar-icon-btn.active {
  background: var(--bg-active);
  color: var(--text-accent);
}

.toolbar-pill-btn {
  height: 30px;
  padding: 0 10px;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  transition: all 0.14s ease;
  white-space: nowrap;
}

.toolbar-pill-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.toolbar-kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--bg-app);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.toolbar-divider {
  width: 1px;
  height: 18px;
  background: var(--border-subtle);
  margin: 0 4px;
  flex-shrink: 0;
}

/* History Navigation Group */
.history-nav-group {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1px;
}

.history-nav-group .toolbar-icon-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.history-dropdown-wrap {
  position: relative;
}

.history-popover {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 290px;
  background: var(--bg-sheet);
  border: 1px solid var(--border-default);
  border-radius: 10px;
  box-shadow: var(--shadow-modal);
  z-index: 100;
  overflow: hidden;
}

.popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-subtle);
}

.popover-badge {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-accent);
}

.history-list {
  max-height: 260px;
  overflow-y: auto;
  padding: 4px;
}

.history-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--text-secondary);
  text-align: left;
}

.history-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.history-item.current {
  background: var(--bg-active);
  color: var(--text-accent);
  font-weight: 600;
}

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

/* Breadcrumbs */
.viewer-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12.5px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.breadcrumb-segment {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.breadcrumb-segment.active {
  color: var(--text-primary);
  font-weight: 600;
}

.breadcrumb-sep {
  color: var(--text-muted);
  font-size: 11px;
}

/* PDF Zoom Controls */
.pdf-zoom-controls {
  display: inline-flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1px;
}

.pdf-zoom-controls .toolbar-icon-btn {
  width: 28px;
  height: 28px;
}

.zoom-readout-btn {
  min-width: 52px;
  height: 28px;
  padding: 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: 5px;
}

.zoom-readout-btn:hover {
  background: var(--bg-hover);
}

/* ==========================================================================
   3-COLUMN WORKSPACE (LEFT OUTLINE | CENTER PDF | RIGHT VSCODE EXPLORER)
   ========================================================================== */
.viewer-workspace {
  flex: 1;
  min-height: 0;
  display: flex;
  position: relative;
  overflow: hidden;
}

/* Sidebars Shared */
.sidebar {
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  min-height: 0;
  flex-shrink: 0;
  z-index: 20;
  transition: width 0.15s ease, transform 0.2s ease;
}

.left-sidebar {
  width: var(--left-sidebar-width);
  border-right: 1px solid var(--border-subtle);
}

.right-sidebar {
  width: var(--right-sidebar-width);
  border-left: 1px solid var(--border-subtle);
}

.sidebar.collapsed {
  width: 0 !important;
  overflow: hidden;
  border: none;
}

.sidebar-resizer {
  width: 4px;
  cursor: col-resize;
  background: transparent;
  transition: background 0.15s ease;
  z-index: 25;
  flex-shrink: 0;
}

.sidebar-resizer:hover,
.sidebar-resizer.dragging {
  background: var(--accent-primary);
}

.sidebar-header {
  height: 38px;
  padding: 0 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.sidebar-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
}

.sidebar-tab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  transition: all 0.14s ease;
}

.sidebar-tab:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}

.sidebar-tab.active {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.sidebar-count-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 0px 5px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
}

.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

.sidebar-action-btn {
  width: 25px;
  height: 25px;
  border-radius: 5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.14s ease;
}

.sidebar-action-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Reading Progress Bar in Left Sidebar */
.reading-progress-track {
  height: 2px;
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  flex-shrink: 0;
}

.reading-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #6366f1, #38bdf8);
  transition: width 0.1s linear;
}

/* Sidebar Search Input */
.sidebar-search-box {
  position: relative;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.sidebar-search-box svg {
  position: absolute;
  left: 19px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.sidebar-search-box input {
  width: 100%;
  background: var(--bg-app);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 5px 8px 5px 27px;
  font-size: 12px;
  color: var(--text-primary);
}

.sidebar-search-box input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.sidebar-scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: 8px 6px;
}

/* ==========================================================================
   LEFT SIDEBAR: SECTIONAL NAVIGATOR (TABLE OF CONTENTS & FIGURES)
   ========================================================================== */
.outline-tree {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.outline-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 9px;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.13s ease;
  line-height: 1.35;
  border-left: 2px solid transparent;
}

.outline-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.outline-item.active {
  background: var(--bg-active);
  color: #c7d2fe;
  font-weight: 500;
  border-left-color: var(--accent-primary);
}

.outline-level-badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-muted);
  width: 18px;
}

.outline-item.active .outline-level-badge {
  color: var(--text-accent);
}

.outline-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Heading Indentation Levels */
.outline-item.level-1 { padding-left: 8px; font-weight: 600; color: var(--text-primary); }
.outline-item.level-2 { padding-left: 16px; }
.outline-item.level-3 { padding-left: 28px; font-size: 12px; }
.outline-item.level-4 { padding-left: 40px; font-size: 11.5px; color: var(--text-muted); }
.outline-item.level-5 { padding-left: 50px; font-size: 11.5px; color: var(--text-muted); }
.outline-item.level-6 { padding-left: 58px; font-size: 11px; color: var(--text-muted); }

/* Figures & Diagrams Jumper List */
.figures-index-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 2px;
}

.figure-nav-card {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 8px 10px;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  text-align: left;
  transition: all 0.14s ease;
}

.figure-nav-card:hover {
  background: var(--bg-hover);
  border-color: var(--border-default);
}

.figure-nav-badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
}

.figure-nav-badge.mermaid {
  background: rgba(139, 92, 246, 0.18);
  color: #c4b5fd;
}

.figure-nav-badge.chart {
  background: rgba(56, 189, 248, 0.18);
  color: #7dd3fc;
}

.figure-nav-badge.image {
  background: rgba(16, 185, 129, 0.18);
  color: #6ee7b7;
}

.figure-nav-badge.table {
  background: rgba(245, 158, 11, 0.18);
  color: #fcd34d;
}

.figure-nav-title {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.35;
}

.sidebar-empty-note {
  padding: 24px 12px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
}

/* ==========================================================================
   RIGHT SIDEBAR: VS CODE FILE & FOLDER EXPLORER
   ========================================================================== */
.vscode-explorer-header .sidebar-title-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}

.vscode-workspace-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.025);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.workspace-bar-left {
  display: flex;
  align-items: center;
  gap: 5px;
  min-width: 0;
}

.workspace-name {
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.vscode-tree {
  display: flex;
  flex-direction: column;
  user-select: none;
}

.tree-row {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 27px;
  padding-right: 8px;
  border-radius: 5px;
  font-size: 12.5px;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.1s ease, color 0.1s ease;
  position: relative;
}

.tree-row:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tree-row.active {
  background: var(--bg-active);
  color: #ffffff;
  font-weight: 500;
}

.tree-row.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2.5px;
  border-radius: 2px;
  background: var(--accent-primary);
}

.tree-chevron {
  width: 14px;
  height: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform 0.14s ease;
  flex-shrink: 0;
}

.tree-chevron.expanded {
  transform: rotate(90deg);
}

.tree-chevron.empty {
  visibility: hidden;
}

.tree-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.tree-icon.folder-icon {
  color: #a78bfa;
}

.tree-icon.md-icon {
  color: #38bdf8;
}

.tree-icon.img-icon {
  color: #34d399;
}

.tree-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-children {
  display: flex;
  flex-direction: column;
  position: relative;
}

.tree-children.collapsed {
  display: none;
}

/* Recent Cached Switcher Drawer inside Right Sidebar */
.explorer-recent-drawer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-toolbar);
  flex-shrink: 0;
}

.explorer-section-toggle {
  width: 100%;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.explorer-section-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.explorer-section-toggle .toggle-chevron {
  margin-left: auto;
  transition: transform 0.15s ease;
}

.explorer-section-toggle.open .toggle-chevron {
  transform: rotate(180deg);
}

.mini-recent-list {
  max-height: 165px;
  overflow-y: auto;
  padding: 4px 6px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mini-recent-item {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 8px;
  border-radius: 5px;
  font-size: 12px;
  color: var(--text-secondary);
  text-align: left;
}

.mini-recent-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.mini-recent-item span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ==========================================================================
   CENTER PDF DOCUMENT CANVAS & SHEET
   ========================================================================== */
.center-canvas {
  flex: 1;
  min-width: 0;
  min-height: 0;
  background: var(--bg-canvas);
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Floating Find in Document Bar */
.find-bar {
  position: absolute;
  top: 12px;
  right: 22px;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.55);
}

.find-bar svg {
  color: var(--text-muted);
}

.find-bar input {
  background: transparent;
  border: none;
  font-size: 12.5px;
  color: var(--text-primary);
  width: 170px;
}

.find-bar input:focus {
  outline: none;
}

.find-match-count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding: 0 4px;
}

.find-nav-btn {
  width: 24px;
  height: 24px;
  border-radius: 5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.find-nav-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Document Viewport & PDF Sheet */
.document-viewport {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  padding: 28px 24px 64px;
  scroll-behavior: smooth;
}

.document-zoom-wrapper {
  display: flex;
  justify-content: center;
  min-height: 100%;
  transform-origin: top center;
}

.document-sheet {
  width: 100%;
  background: var(--bg-sheet);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  box-shadow: var(--shadow-sheet);
  padding: 48px 56px;
  transition: max-width 0.2s ease, padding 0.2s ease;
  position: relative;
}

/* Page Width Modes */
.document-sheet.page-mode-sheet {
  max-width: 850px;
}

.document-sheet.page-mode-wide {
  max-width: 1120px;
}

.document-sheet.page-mode-full {
  max-width: 100%;
}

/* Font Modes */
.document-sheet.font-mode-sans .markdown-body {
  font-family: var(--font-sans);
}

.document-sheet.font-mode-serif .markdown-body {
  font-family: var(--font-serif);
  font-size: 16.5px;
}

.document-sheet.font-mode-mono .markdown-body {
  font-family: var(--font-mono);
  font-size: 13.5px;
}

/* YAML Frontmatter Metadata Card */
.doc-frontmatter {
  margin-bottom: 28px;
  padding: 14px 18px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.frontmatter-field {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
}

.frontmatter-key {
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 10.5px;
}

.frontmatter-val {
  color: var(--text-primary);
  font-weight: 500;
}

.frontmatter-tag {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 999px;
  font-size: 11px;
  background: rgba(99, 102, 241, 0.16);
  color: #c7d2fe;
  margin-right: 4px;
}

/* ==========================================================================
   MARKDOWN BODY TYPOGRAPHY & ADVANCED ELEMENTS
   ========================================================================== */
.markdown-body {
  color: #dbe3f2;
  font-size: 15px;
  line-height: 1.74;
  word-wrap: break-word;
}

.markdown-body > *:first-child {
  margin-top: 0 !important;
}

/* Headings */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: #ffffff;
  font-weight: 600;
  line-height: 1.3;
  margin-top: 1.75em;
  margin-bottom: 0.65em;
  scroll-margin-top: 24px;
  position: relative;
}

.markdown-body h1 {
  font-size: 2.05em;
  font-weight: 700;
  letter-spacing: -0.025em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--border-subtle);
}

.markdown-body h2 {
  font-size: 1.52em;
  letter-spacing: -0.015em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.markdown-body h3 {
  font-size: 1.24em;
}

.markdown-body h4 {
  font-size: 1.06em;
  color: #cbd5e1;
}

.markdown-body h5,
.markdown-body h6 {
  font-size: 0.95em;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.heading-anchor-btn {
  opacity: 0;
  margin-left: 8px;
  font-size: 0.75em;
  color: var(--text-muted);
  text-decoration: none;
  transition: opacity 0.15s ease;
}

.markdown-body h1:hover .heading-anchor-btn,
.markdown-body h2:hover .heading-anchor-btn,
.markdown-body h3:hover .heading-anchor-btn,
.markdown-body h4:hover .heading-anchor-btn {
  opacity: 1;
}

.heading-flash {
  animation: flashHighlight 1.4s ease;
}

@keyframes flashHighlight {
  0% { background: rgba(99, 102, 241, 0.28); border-radius: 6px; }
  100% { background: transparent; }
}

/* Paragraphs & Lists */
.markdown-body p {
  margin-bottom: 1.15em;
}

.markdown-body ul,
.markdown-body ol {
  margin-bottom: 1.15em;
  padding-left: 1.75em;
}

.markdown-body li {
  margin-bottom: 0.35em;
}

.markdown-body li > ul,
.markdown-body li > ol {
  margin-top: 0.35em;
  margin-bottom: 0.35em;
}

/* Task Lists */
.markdown-body input[type="checkbox"] {
  accent-color: var(--accent-primary);
  width: 15px;
  height: 15px;
  margin-right: 7px;
  vertical-align: -2px;
}

/* Links (Internal Markdown Links vs External Links vs Anchor Links) */
.markdown-body a {
  color: #818cf8;
  text-decoration: none;
  border-bottom: 1px solid rgba(129, 140, 248, 0.35);
  transition: all 0.14s ease;
}

.markdown-body a:hover {
  color: #a5b4fc;
  border-bottom-color: #a5b4fc;
}

.markdown-body a.md-internal-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px 7px;
  margin: 0 1px;
  border-radius: 5px;
  background: rgba(99, 102, 241, 0.13);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  font-weight: 500;
  font-size: 0.94em;
}

.markdown-body a.md-internal-link:hover {
  background: rgba(99, 102, 241, 0.24);
  border-color: rgba(129, 140, 248, 0.55);
  color: #ffffff;
}

/* Inline Code, Mark, Kbd */
.markdown-body :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.18em 0.45em;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.065);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
}

.markdown-body mark {
  background: rgba(250, 204, 21, 0.22);
  color: #fef08a;
  padding: 1px 5px;
  border-radius: 4px;
}

.markdown-body kbd {
  font-family: var(--font-mono);
  font-size: 0.82em;
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.4);
  color: var(--text-primary);
}

/* ==========================================================================
   CODE BLOCKS WITH HEADER, HIGH-CONTRAST TOKENS & THEMES
   ========================================================================== */
.code-block-wrapper {
  margin: 1.4em 0;
  border-radius: 10px;
  background: #0d1117 !important;
  border: 1px solid #30363d !important;
  box-shadow: 0 4px 22px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  position: relative;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: #161b22 !important;
  border-bottom: 1px solid #30363d !important;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: #8b949e !important;
  user-select: none;
}

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

.code-lang-label {
  font-weight: 600;
  letter-spacing: 0.05em;
  color: #8b949e !important;
  text-transform: uppercase;
  font-size: 11px;
}

.code-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.code-copy-btn,
.code-style-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3.5px 9px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font-sans);
  color: #c9d1d9 !important;
  background: #21262d !important;
  border: 1px solid #30363d !important;
  cursor: pointer;
  transition: all 0.15s ease;
}

.code-copy-btn:hover,
.code-style-btn:hover {
  background: #30363d !important;
  color: #f0f6fc !important;
  border-color: #8b949e !important;
}

.code-copy-btn.copied {
  background: rgba(46, 160, 67, 0.2) !important;
  color: #7ee787 !important;
  border-color: #2ea043 !important;
}

.markdown-body pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.65;
  background: transparent !important;
  color: #e6edf3 !important;
}

.markdown-body pre code {
  display: block;
  background: transparent !important;
  padding: 0 !important;
  border: none !important;
  color: #e6edf3 !important;
}

/* Explicit high-contrast base for unhighlighted tokens, JSX text, and punctuation */
.code-block-wrapper pre,
.code-block-wrapper pre code,
.markdown-body .code-block-wrapper pre code {
  color: #e6edf3 !important;
}

/* Contrast-guaranteed syntax tokens for Dark Code Cards */
.code-block-wrapper .hljs-keyword,
.code-block-wrapper .hljs-selector-tag,
.code-block-wrapper .hljs-doctag {
  color: #ff7b72 !important;
  font-weight: 600;
}

.code-block-wrapper .hljs-title,
.code-block-wrapper .hljs-title.function_,
.code-block-wrapper .hljs-title.class_,
.code-block-wrapper .hljs-title.class_.inherited__ {
  color: #d2a8ff !important;
}

.code-block-wrapper .hljs-tag {
  color: #7ee787 !important;
}

.code-block-wrapper .hljs-name {
  color: #7ee787 !important;
  font-weight: 600;
}

.code-block-wrapper .hljs-attr,
.code-block-wrapper .hljs-attribute,
.code-block-wrapper .hljs-number,
.code-block-wrapper .hljs-literal,
.code-block-wrapper .hljs-variable,
.code-block-wrapper .hljs-template-variable {
  color: #79c0ff !important;
}

.code-block-wrapper .hljs-string,
.code-block-wrapper .hljs-regexp,
.code-block-wrapper .hljs-meta .hljs-string {
  color: #a5d6ff !important;
}

.code-block-wrapper .hljs-built_in,
.code-block-wrapper .hljs-symbol {
  color: #ffa657 !important;
}

.code-block-wrapper .hljs-comment,
.code-block-wrapper .hljs-quote {
  color: #8b949e !important;
  font-style: italic;
}

.code-block-wrapper .hljs-subst,
.code-block-wrapper .hljs-punctuation,
.code-block-wrapper .hljs-operator {
  color: #e6edf3 !important;
}

.code-block-wrapper .hljs-addition {
  color: #7ee787 !important;
  background: rgba(46, 160, 67, 0.2) !important;
}

.code-block-wrapper .hljs-deletion {
  color: #ff7b72 !important;
  background: rgba(248, 81, 73, 0.2) !important;
}

/* Blockquotes & GitHub Alerts / Callouts */
.markdown-body blockquote {
  margin: 1.25em 0;
  padding: 12px 18px;
  border-left: 3.5px solid var(--accent-primary);
  background: rgba(99, 102, 241, 0.06);
  border-radius: 0 8px 8px 0;
  color: #cbd5e1;
}

.markdown-body blockquote > *:last-child {
  margin-bottom: 0;
}

.md-callout {
  margin: 1.35em 0;
  padding: 14px 18px;
  border-radius: 10px;
  border: 1px solid var(--border-default);
  border-left-width: 4px;
  background: rgba(24, 31, 46, 0.55);
}

.md-callout-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 13.5px;
  margin-bottom: 6px;
}

.md-callout.callout-note {
  border-left-color: #38bdf8;
  background: rgba(56, 189, 248, 0.07);
}
.md-callout.callout-note .md-callout-title { color: #38bdf8; }

.md-callout.callout-tip {
  border-left-color: #10b981;
  background: rgba(16, 185, 129, 0.07);
}
.md-callout.callout-tip .md-callout-title { color: #34d399; }

.md-callout.callout-important {
  border-left-color: #a855f7;
  background: rgba(168, 85, 247, 0.07);
}
.md-callout.callout-important .md-callout-title { color: #c084fc; }

.md-callout.callout-warning {
  border-left-color: #f59e0b;
  background: rgba(245, 158, 11, 0.07);
}
.md-callout.callout-warning .md-callout-title { color: #fbbf24; }

.md-callout.callout-caution {
  border-left-color: #ef4444;
  background: rgba(239, 68, 68, 0.07);
}
.md-callout.callout-caution .md-callout-title { color: #f87171; }

/* Figures, Images, Mermaid Diagrams & Charts */
.md-figure {
  margin: 1.65em 0;
  border-radius: 12px;
  background: rgba(11, 14, 22, 0.72);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  scroll-margin-top: 24px;
}

.md-figure-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 14px;
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 11.5px;
  color: var(--text-muted);
}

.md-figure-type {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

.md-figure-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.figure-btn {
  padding: 3px 8px;
  border-radius: 5px;
  font-size: 11px;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
}

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

.md-figure-stage {
  padding: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
  min-height: 120px;
}

.md-figure-stage img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  cursor: zoom-in;
  transition: transform 0.18s ease;
}

.md-figure figcaption {
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.018);
  border-top: 1px solid var(--border-subtle);
  font-size: 12.5px;
  color: var(--text-secondary);
  text-align: center;
}

.figure-num-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-right: 5px;
}

.mermaid-render-box {
  width: 100%;
  display: flex;
  justify-content: center;
  cursor: zoom-in;
}

.mermaid-render-box svg {
  max-width: 100%;
  height: auto;
}

.chart-canvas-wrap {
  width: 100%;
  max-width: 680px;
  height: 320px;
  position: relative;
}

/* Tables */
.md-table-wrapper {
  margin: 1.4em 0;
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  scroll-margin-top: 24px;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

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

.markdown-body th {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-weight: 600;
}

.markdown-body tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.015);
}

.markdown-body tr:last-child td {
  border-bottom: none;
}

/* Math Blocks */
.math-block {
  margin: 1.3em 0;
  padding: 14px 18px;
  overflow-x: auto;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  text-align: center;
}

/* Horizontal Rule & Details */
.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 2em 0;
}

.markdown-body details {
  margin: 1.2em 0;
  padding: 12px 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle);
}

.markdown-body summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
}

/* Search Highlight Mark in Document */
mark.search-match {
  background: rgba(250, 204, 21, 0.35);
  color: #ffffff;
  padding: 0 2px;
  border-radius: 3px;
}

mark.search-match.active-match {
  background: #f97316;
  color: #ffffff;
  box-shadow: 0 0 0 2px rgba(249, 115, 22, 0.4);
}

/* Document Footer Navigation (Prev / Next File in Folder) */
.doc-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.doc-footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.doc-nav-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  text-align: left;
  transition: all 0.15s ease;
}

.doc-nav-card:hover {
  background: var(--bg-elevated);
  border-color: var(--border-accent);
}

.doc-nav-card.next {
  text-align: right;
}

.doc-nav-dir {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.doc-nav-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-accent);
}

/* ==========================================================================
   BOTTOM STATUS BAR
   ========================================================================== */
.viewer-statusbar {
  height: var(--statusbar-height);
  flex-shrink: 0;
  background: var(--bg-toolbar);
  border-top: 1px solid var(--border-subtle);
  padding: 0 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--text-muted);
  user-select: none;
}

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

.status-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-path {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

/* ==========================================================================
   MODALS (LIGHTBOX & QUICK OPEN) & TOASTS
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(6, 8, 13, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

/* Lightbox */
.lightbox-container {
  width: 100%;
  max-width: 1200px;
  height: 88vh;
  background: var(--bg-sheet);
  border: 1px solid var(--border-default);
  border-radius: 14px;
  box-shadow: var(--shadow-modal);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.lightbox-toolbar {
  height: 46px;
  padding: 0 16px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lightbox-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.lightbox-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lightbox-stage {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  background: var(--bg-canvas);
}

.lightbox-content {
  transition: transform 0.15s ease;
  transform-origin: center center;
}

.lightbox-content img,
.lightbox-content svg {
  max-width: 100%;
  max-height: 74vh;
  border-radius: 8px;
}

/* Quick Open Modal (Ctrl+P) */
.quick-open-dialog {
  width: 100%;
  max-width: 560px;
  background: var(--bg-sheet);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  box-shadow: var(--shadow-modal);
  overflow: hidden;
  align-self: flex-start;
  margin-top: 8vh;
}

.quick-open-input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border-subtle);
}

.quick-open-input-wrap svg {
  color: var(--text-accent);
}

.quick-open-input-wrap input {
  flex: 1;
  background: transparent;
  border: none;
  font-size: 14px;
  color: var(--text-primary);
}

.quick-open-input-wrap input:focus {
  outline: none;
}

.quick-open-results {
  max-height: 340px;
  overflow-y: auto;
  padding: 6px;
}

.quick-open-item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  text-align: left;
  color: var(--text-secondary);
}

.quick-open-item:hover,
.quick-open-item.selected {
  background: var(--bg-active);
  color: var(--text-primary);
}

.quick-open-item-left {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.quick-open-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
}

.quick-open-path {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 38px;
  right: 18px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 10px 15px;
  border-radius: 9px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  font-size: 12.5px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastIn 0.2s ease;
}

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

/* ==========================================================================
   RESPONSIVE DESIGN (TABLET & MOBILE)
   ========================================================================== */
.mobile-sidebar-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 7, 12, 0.65);
  backdrop-filter: blur(3px);
  z-index: 15;
}

@media (max-width: 1024px) {
  .sidebar-resizer {
    display: none;
  }

  .left-sidebar,
  .right-sidebar {
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: 25;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.75);
  }

  .left-sidebar {
    left: 0;
  }

  .right-sidebar {
    right: 0;
  }

  .document-sheet {
    padding: 32px 28px;
  }
}

@media (max-width: 768px) {
  .open-cards-grid {
    grid-template-columns: 1fr;
  }

  .hide-mobile {
    display: none !important;
  }

  .home-header-inner {
    padding: 12px 16px;
  }

  .home-main {
    padding: 24px 16px 48px;
  }

  .hero-heading h1 {
    font-size: 22px;
  }

  .document-viewport {
    padding: 14px 10px 48px;
  }

  .document-sheet {
    padding: 22px 18px;
    border-radius: 8px;
  }

  .doc-footer-nav {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   ACCESSIBILITY & ADAPTIVE READING: DYSLEXIA FONTS & BIONIC READING
   ========================================================================== */

/* Dyslexia-Optimized Typography */
.document-sheet.font-mode-opendyslexic .markdown-body {
  font-family: 'OpenDyslexic', 'OpenDyslexic3', 'Lexend', -apple-system, sans-serif;
  letter-spacing: 0.035em;
  word-spacing: 0.08em;
  line-height: 1.88;
}

.document-sheet.font-mode-opendyslexic .markdown-body h1,
.document-sheet.font-mode-opendyslexic .markdown-body h2,
.document-sheet.font-mode-opendyslexic .markdown-body h3,
.document-sheet.font-mode-opendyslexic .markdown-body h4 {
  letter-spacing: 0.025em;
  line-height: 1.45;
}

.document-sheet.font-mode-lexend .markdown-body {
  font-family: 'Lexend', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  letter-spacing: 0.02em;
  word-spacing: 0.04em;
  line-height: 1.82;
}

/* Bionic Reading (ADHD Focus Assistant) */
.bionic-word {
  display: inline;
}

.bionic-fixation {
  font-weight: 750;
  color: inherit;
  letter-spacing: -0.01em;
}

.document-sheet.sheet-theme-dark .bionic-fixation {
  color: #ffffff;
}

.document-sheet.sheet-theme-white .bionic-fixation {
  color: #050811;
  font-weight: 800;
}

.document-sheet.sheet-theme-sepia .bionic-fixation {
  color: #171007;
  font-weight: 800;
}

.bionic-tail {
  opacity: 0.92;
}

/* Toolbar Bionic Pill */
.bionic-pill-btn {
  gap: 6px;
  position: relative;
}

.bionic-tag-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.16s ease;
}

.bionic-pill-btn.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(129, 140, 248, 0.6);
  color: #c7d2fe;
}

.bionic-pill-btn.active .bionic-tag-dot {
  background: #38bdf8;
  box-shadow: 0 0 8px #38bdf8;
}

/* ==========================================================================
   READING AREA THEMES: DARK (DEFAULT), WHITE PAPER, AND SEPIA/YELLOW MODE
   ========================================================================== */

/* 1. Pure White Clean Paper Mode */
.document-sheet.sheet-theme-white {
  background: #ffffff !important;
  border-color: #cbd5e1 !important;
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.35) !important;
  color: #1e293b !important;
}

.document-sheet.sheet-theme-white .markdown-body {
  color: #1e293b !important;
}

.document-sheet.sheet-theme-white .markdown-body h1,
.document-sheet.sheet-theme-white .markdown-body h2,
.document-sheet.sheet-theme-white .markdown-body h3,
.document-sheet.sheet-theme-white .markdown-body h4,
.document-sheet.sheet-theme-white .markdown-body h5,
.document-sheet.sheet-theme-white .markdown-body h6 {
  color: #0f172a !important;
}

.document-sheet.sheet-theme-white .markdown-body h1 {
  border-bottom-color: #e2e8f0 !important;
}

.document-sheet.sheet-theme-white .markdown-body h2 {
  border-bottom-color: #f1f5f9 !important;
}

.document-sheet.sheet-theme-white .markdown-body a {
  color: #4f46e5 !important;
  border-bottom-color: rgba(79, 70, 229, 0.35) !important;
}

.document-sheet.sheet-theme-white .markdown-body a:hover {
  color: #3730a3 !important;
}

.document-sheet.sheet-theme-white .markdown-body a.md-internal-link {
  background: rgba(79, 70, 229, 0.08) !important;
  border-color: rgba(79, 70, 229, 0.25) !important;
  color: #4338ca !important;
}

.document-sheet.sheet-theme-white .markdown-body a.md-internal-link:hover {
  background: rgba(79, 70, 229, 0.16) !important;
  color: #312e81 !important;
}

.document-sheet.sheet-theme-white .markdown-body :not(pre) > code {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
  color: #0f172a !important;
}

.document-sheet.sheet-theme-white .markdown-body blockquote {
  background: #f8fafc !important;
  border-left-color: #4f46e5 !important;
  color: #334155 !important;
}

.document-sheet.sheet-theme-white .markdown-body table th {
  background: #f8fafc !important;
  color: #0f172a !important;
  border-bottom-color: #e2e8f0 !important;
}

.document-sheet.sheet-theme-white .markdown-body table td {
  border-bottom-color: #e2e8f0 !important;
  color: #1e293b !important;
}

.document-sheet.sheet-theme-white .markdown-body table tr:nth-child(even) td {
  background: #f8fafc !important;
}

.document-sheet.sheet-theme-white .md-figure {
  background: #f8fafc !important;
  border-color: #e2e8f0 !important;
}

.document-sheet.sheet-theme-white .md-figure-toolbar {
  background: #f1f5f9 !important;
  border-bottom-color: #e2e8f0 !important;
  color: #475569 !important;
}

.document-sheet.sheet-theme-white .md-figure figcaption {
  background: #f1f5f9 !important;
  border-top-color: #e2e8f0 !important;
  color: #475569 !important;
}

.document-sheet.sheet-theme-white .doc-frontmatter {
  background: #f8fafc !important;
  border-color: #e2e8f0 !important;
}

.document-sheet.sheet-theme-white .frontmatter-key {
  color: #64748b !important;
}

.document-sheet.sheet-theme-white .frontmatter-val {
  color: #0f172a !important;
}

.document-sheet.sheet-theme-white .doc-nav-card {
  background: #f8fafc !important;
  border-color: #e2e8f0 !important;
}

.document-sheet.sheet-theme-white .doc-nav-card:hover {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
}

.document-sheet.sheet-theme-white .doc-nav-title {
  color: #4338ca !important;
}

.document-sheet.sheet-theme-white .math-block {
  background: #f8fafc !important;
  border-color: #e2e8f0 !important;
  color: #0f172a !important;
}

/* White Paper Sheet: High-Contrast Dark Code Blocks (Default) */
.document-sheet.sheet-theme-white .code-block-wrapper {
  background: #0d1117 !important;
  border-color: #30363d !important;
  box-shadow: 0 6px 24px rgba(15, 23, 42, 0.16) !important;
}

.document-sheet.sheet-theme-white .code-block-header {
  background: #161b22 !important;
  border-bottom-color: #30363d !important;
  color: #8b949e !important;
}

.document-sheet.sheet-theme-white .code-lang-label {
  color: #8b949e !important;
}

.document-sheet.sheet-theme-white .code-copy-btn,
.document-sheet.sheet-theme-white .code-style-btn {
  background: #21262d !important;
  border-color: #30363d !important;
  color: #c9d1d9 !important;
}

.document-sheet.sheet-theme-white .code-copy-btn:hover,
.document-sheet.sheet-theme-white .code-style-btn:hover {
  background: #30363d !important;
  color: #f0f6fc !important;
  border-color: #8b949e !important;
}

.document-sheet.sheet-theme-white .code-block-wrapper pre code {
  color: #e6edf3 !important;
}

/* White Paper Sheet: Optional Paper Code Box Mode */
.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode {
  background: #f6f8fa !important;
  border: 1px solid #d0d7de !important;
  box-shadow: 0 3px 12px rgba(15, 23, 42, 0.05) !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-header,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .code-block-header {
  background: #eaeef2 !important;
  border-bottom-color: #d0d7de !important;
  color: #57606a !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-lang-label,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .code-lang-label {
  color: #57606a !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-copy-btn,
.document-sheet.sheet-theme-white.code-theme-paper .code-style-btn,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .code-copy-btn,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .code-style-btn {
  background: #ffffff !important;
  border-color: #d0d7de !important;
  color: #24292f !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-copy-btn:hover,
.document-sheet.sheet-theme-white.code-theme-paper .code-style-btn:hover,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .code-copy-btn:hover,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .code-style-btn:hover {
  background: #f3f4f6 !important;
  color: #0969da !important;
  border-color: #0969da !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper pre code,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode pre code {
  color: #24292f !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-keyword,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-keyword {
  color: #cf222e !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-title,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-title {
  color: #8250df !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-tag,
.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-name,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-tag,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-name {
  color: #116329 !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-string,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-string {
  color: #0a3069 !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-attr,
.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-number,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-attr,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-number {
  color: #0550ae !important;
}

.document-sheet.sheet-theme-white.code-theme-paper .code-block-wrapper .hljs-comment,
.document-sheet.sheet-theme-white .code-block-wrapper.code-paper-mode .hljs-comment {
  color: #6e7781 !important;
}

/* 2. Warm Sepia / Yellow Reading Mode (Kindle / Paper Style) */
.document-sheet.sheet-theme-sepia {
  background: #fbf0d9 !important;
  border-color: #e5d7be !important;
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.45) !important;
  color: #2c2317 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body {
  color: #2c2317 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body h1,
.document-sheet.sheet-theme-sepia .markdown-body h2,
.document-sheet.sheet-theme-sepia .markdown-body h3,
.document-sheet.sheet-theme-sepia .markdown-body h4,
.document-sheet.sheet-theme-sepia .markdown-body h5,
.document-sheet.sheet-theme-sepia .markdown-body h6 {
  color: #1e170e !important;
}

.document-sheet.sheet-theme-sepia .markdown-body h1 {
  border-bottom-color: rgba(90, 65, 30, 0.18) !important;
}

.document-sheet.sheet-theme-sepia .markdown-body h2 {
  border-bottom-color: rgba(90, 65, 30, 0.12) !important;
}

.document-sheet.sheet-theme-sepia .markdown-body a {
  color: #854d0e !important;
  border-bottom-color: rgba(133, 77, 14, 0.35) !important;
}

.document-sheet.sheet-theme-sepia .markdown-body a:hover {
  color: #713f12 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body a.md-internal-link {
  background: rgba(180, 110, 20, 0.12) !important;
  border-color: rgba(180, 110, 20, 0.28) !important;
  color: #78350f !important;
}

.document-sheet.sheet-theme-sepia .markdown-body a.md-internal-link:hover {
  background: rgba(180, 110, 20, 0.2) !important;
  color: #451a03 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body :not(pre) > code {
  background: #ede2cb !important;
  border-color: #dccea9 !important;
  color: #2c2317 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body blockquote {
  background: #f4e9d0 !important;
  border-left-color: #b45309 !important;
  color: #453724 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body table th {
  background: #f2e6cb !important;
  color: #1e170e !important;
  border-bottom-color: #dccea9 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body table td {
  border-bottom-color: #dccea9 !important;
  color: #2c2317 !important;
}

.document-sheet.sheet-theme-sepia .markdown-body table tr:nth-child(even) td {
  background: #f5ebd2 !important;
}

.document-sheet.sheet-theme-sepia .md-figure {
  background: #f5ebd2 !important;
  border-color: #dccea9 !important;
}

.document-sheet.sheet-theme-sepia .md-figure-toolbar {
  background: #ece0c3 !important;
  border-bottom-color: #dccea9 !important;
  color: #5c4731 !important;
}

.document-sheet.sheet-theme-sepia .md-figure figcaption {
  background: #ece0c3 !important;
  border-top-color: #dccea9 !important;
  color: #5c4731 !important;
}

.document-sheet.sheet-theme-sepia .doc-frontmatter {
  background: #f4e9d0 !important;
  border-color: #dccea9 !important;
}

.document-sheet.sheet-theme-sepia .frontmatter-key {
  color: #7c6246 !important;
}

.document-sheet.sheet-theme-sepia .frontmatter-val {
  color: #1e170e !important;
}

.document-sheet.sheet-theme-sepia .doc-nav-card {
  background: #f4e9d0 !important;
  border-color: #dccea9 !important;
}

.document-sheet.sheet-theme-sepia .doc-nav-card:hover {
  background: #ede2cb !important;
  border-color: #d0c095 !important;
}

.document-sheet.sheet-theme-sepia .doc-nav-title {
  color: #854d0e !important;
}

.document-sheet.sheet-theme-sepia .math-block {
  background: #f4e9d0 !important;
  border-color: #dccea9 !important;
  color: #1e170e !important;
}

/* Warm Sepia / Yellow Sheet: High-Contrast Dark Code Blocks (Default) */
.document-sheet.sheet-theme-sepia .code-block-wrapper {
  background: #0d1117 !important;
  border-color: #30363d !important;
  box-shadow: 0 6px 24px rgba(50, 35, 15, 0.22) !important;
}

.document-sheet.sheet-theme-sepia .code-block-header {
  background: #161b22 !important;
  border-bottom-color: #30363d !important;
  color: #8b949e !important;
}

.document-sheet.sheet-theme-sepia .code-lang-label {
  color: #8b949e !important;
}

.document-sheet.sheet-theme-sepia .code-copy-btn,
.document-sheet.sheet-theme-sepia .code-style-btn {
  background: #21262d !important;
  border-color: #30363d !important;
  color: #c9d1d9 !important;
}

.document-sheet.sheet-theme-sepia .code-copy-btn:hover,
.document-sheet.sheet-theme-sepia .code-style-btn:hover {
  background: #30363d !important;
  color: #f0f6fc !important;
  border-color: #8b949e !important;
}

.document-sheet.sheet-theme-sepia .code-block-wrapper pre code {
  color: #e6edf3 !important;
}

/* Warm Sepia / Yellow Sheet: Optional Warm Paper Code Box Mode */
.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode {
  background: #f4e9d0 !important;
  border: 1px solid #dccea9 !important;
  box-shadow: 0 3px 12px rgba(90, 65, 30, 0.08) !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-header,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .code-block-header {
  background: #ece0c3 !important;
  border-bottom-color: #dccea9 !important;
  color: #7c6246 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-lang-label,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .code-lang-label {
  color: #5c4731 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-copy-btn,
.document-sheet.sheet-theme-sepia.code-theme-paper .code-style-btn,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .code-copy-btn,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .code-style-btn {
  background: #fbf0d9 !important;
  border-color: #d0c095 !important;
  color: #453724 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-copy-btn:hover,
.document-sheet.sheet-theme-sepia.code-theme-paper .code-style-btn:hover,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .code-copy-btn:hover,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .code-style-btn:hover {
  background: #e5d5b0 !important;
  color: #1e170e !important;
  border-color: #a18a5e !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper pre code,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode pre code {
  color: #2c2317 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-keyword,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-keyword {
  color: #9f1239 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-title,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-title {
  color: #6b21a8 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-tag,
.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-name,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-tag,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-name {
  color: #166534 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-string,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-string {
  color: #1e3a8a !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-attr,
.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-number,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-attr,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-number {
  color: #0369a1 !important;
}

.document-sheet.sheet-theme-sepia.code-theme-paper .code-block-wrapper .hljs-comment,
.document-sheet.sheet-theme-sepia .code-block-wrapper.code-paper-mode .hljs-comment {
  color: #78716c !important;
}

/* ==========================================================================
   DOCUMENT TAGS BAR (TOP OF READING AREA: FAVORITE, IMPORTANT, INCOMPLETE, LIKE)
   ========================================================================== */
.doc-tag-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px;
  margin-bottom: 22px;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle);
  user-select: none;
  transition: all 0.16s ease;
}

.sheet-theme-white .doc-tag-bar {
  background: #f8fafc;
  border-color: #e2e8f0;
}

.sheet-theme-sepia .doc-tag-bar {
  background: #f4e9d0;
  border-color: #dccea9;
}

.tag-bar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tag-bar-label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.sheet-theme-white .tag-bar-label {
  color: #64748b;
}

.sheet-theme-sepia .tag-bar-label {
  color: #7c6246;
}

.tag-pills-list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tag-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all 0.14s ease;
  cursor: pointer;
}

.sheet-theme-white .tag-pill-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #475569;
}

.sheet-theme-sepia .tag-pill-btn {
  background: #fbf0d9;
  border-color: #dccea9;
  color: #5c4731;
}

.tag-pill-btn:hover {
  transform: translateY(-1px);
}

.tag-pill-icon {
  font-size: 12px;
}

/* Tag Active States */
.tag-pill-btn.tag-favorite.active {
  background: rgba(245, 158, 11, 0.16) !important;
  border-color: rgba(245, 158, 11, 0.6) !important;
  color: #fbbf24 !important;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.22);
}

.tag-pill-btn.tag-important.active {
  background: rgba(244, 63, 94, 0.16) !important;
  border-color: rgba(244, 63, 94, 0.6) !important;
  color: #fb7185 !important;
  box-shadow: 0 0 10px rgba(244, 63, 94, 0.22);
}

.tag-pill-btn.tag-incomplete.active {
  background: rgba(2, 132, 199, 0.16) !important;
  border-color: rgba(2, 132, 199, 0.6) !important;
  color: #38bdf8 !important;
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.22);
}

.tag-pill-btn.tag-like.active {
  background: rgba(16, 185, 129, 0.16) !important;
  border-color: rgba(16, 185, 129, 0.6) !important;
  color: #34d399 !important;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.22);
}

.sheet-theme-white .tag-pill-btn.tag-favorite.active { color: #b45309 !important; background: #fef3c7 !important; border-color: #f59e0b !important; }
.sheet-theme-white .tag-pill-btn.tag-important.active { color: #be123c !important; background: #ffe4e6 !important; border-color: #f43f5e !important; }
.sheet-theme-white .tag-pill-btn.tag-incomplete.active { color: #0369a1 !important; background: #e0f2fe !important; border-color: #0284c7 !important; }
.sheet-theme-white .tag-pill-btn.tag-like.active { color: #047857 !important; background: #d1fae5 !important; border-color: #10b981 !important; }

.sheet-theme-sepia .tag-pill-btn.tag-favorite.active { color: #92400e !important; background: #fde68a !important; border-color: #d97706 !important; }
.sheet-theme-sepia .tag-pill-btn.tag-important.active { color: #9f1239 !important; background: #fecdd3 !important; border-color: #e11d48 !important; }
.sheet-theme-sepia .tag-pill-btn.tag-incomplete.active { color: #075985 !important; background: #bae6fd !important; border-color: #0284c7 !important; }
.sheet-theme-sepia .tag-pill-btn.tag-like.active { color: #065f46 !important; background: #a7f3d0 !important; border-color: #059669 !important; }

.tag-bar-right {
  display: flex;
  align-items: center;
}

.tag-bar-shortcut-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-muted);
  padding: 3px 7px;
  border-radius: 5px;
  transition: all 0.14s ease;
}

.tag-bar-shortcut-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.tag-active-counter {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--accent-primary);
  color: #ffffff;
}

/* ==========================================================================
   TAGGED CONTENT EXPLORER DIALOG / MODAL
   ========================================================================== */
.tags-dialog {
  width: 100%;
  max-width: 660px;
  background: var(--bg-sheet);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  box-shadow: var(--shadow-modal);
  overflow: hidden;
  align-self: flex-start;
  margin-top: 7vh;
}

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

.tags-dialog-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tags-header-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: rgba(99, 102, 241, 0.14);
  color: var(--text-accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.tags-dialog-title-group h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}

.tags-dialog-title-group p {
  font-size: 12px;
  color: var(--text-secondary);
}

.tags-count-badge {
  font-family: var(--font-mono);
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
}

.tags-dialog-controls {
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.015);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tags-filter-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.tags-tab {
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-app);
  border: 1px solid var(--border-subtle);
  transition: all 0.14s ease;
}

.tags-tab:hover {
  color: var(--text-primary);
  border-color: var(--border-default);
}

.tags-tab.active {
  background: var(--bg-elevated);
  color: #ffffff;
  border-color: var(--border-accent);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.tags-tab.tab-favorite.active { border-color: rgba(245, 158, 11, 0.6); color: #fbbf24; }
.tags-tab.tab-important.active { border-color: rgba(244, 63, 94, 0.6); color: #fb7185; }
.tags-tab.tab-incomplete.active { border-color: rgba(2, 132, 199, 0.6); color: #38bdf8; }
.tags-tab.tab-like.active { border-color: rgba(16, 185, 129, 0.6); color: #34d399; }

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

.tags-search-wrap svg {
  position: absolute;
  left: 10px;
  color: var(--text-muted);
  pointer-events: none;
}

.tags-search-wrap input {
  width: 100%;
  background: var(--bg-app);
  border: 1px solid var(--border-subtle);
  border-radius: 7px;
  padding: 6px 10px 6px 30px;
  font-size: 12.5px;
  color: var(--text-primary);
}

.tags-search-wrap input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.tags-results-list {
  max-height: 380px;
  overflow-y: auto;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tagged-doc-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  border-radius: 9px;
  background: var(--bg-sheet);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}

.tagged-doc-card:hover {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.tagged-doc-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1;
}

.tagged-doc-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(99, 102, 241, 0.14);
  color: var(--text-accent);
  flex-shrink: 0;
}

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

.tagged-doc-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.tagged-doc-path {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tagged-doc-badges {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.tag-badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tag-badge.favorite { background: rgba(245, 158, 11, 0.18); color: #fbbf24; }
.tag-badge.important { background: rgba(244, 63, 94, 0.18); color: #fb7185; }
.tag-badge.incomplete { background: rgba(2, 132, 199, 0.18); color: #38bdf8; }
.tag-badge.like { background: rgba(16, 185, 129, 0.18); color: #34d399; }

/* Tree row tag dot indicators */
.tree-tag-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  margin-left: 2px;
  flex-shrink: 0;
}
.tree-tag-dot.favorite { background: #f59e0b; }
.tree-tag-dot.important { background: #f43f5e; }
.tree-tag-dot.incomplete { background: #0284c7; }
.tree-tag-dot.like { background: #10b981; }

@media print {
  body, html, #viewer-view, .viewer-workspace, .center-canvas, .document-viewport {
    height: auto !important;
    overflow: visible !important;
    background: #131824 !important;
  }

  .viewer-toolbar,
  .sidebar,
  .sidebar-resizer,
  .viewer-statusbar,
  .find-bar,
  .doc-footer {
    display: none !important;
  }

  .document-sheet {
    box-shadow: none !important;
    border: none !important;
    max-width: 100% !important;
    padding: 0 !important;
  }
}