/* CITAPHIR Academic Technology Design System
   State-of-the-Art Glassmorphism, Neumorphism & Cosmic Sapphire Aesthetic
   100% Deterministic, AI-Independent, Offline-Ready.
*/

:root {
  /* =========================================================================
     EXACT PROFESSIONAL RESEARCH SUITE PALETTE & WATER GLASSMORPHISM SYSTEM
     ========================================================================= */
  --bg-main: #080F1E;
  --bg-sidebar: #0B1425;
  --bg-panel: #111D30;
  --bg-hover: #192943;
  --primary-blue: #3B82F6;
  --secondary-cyan: #22D3EE;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --border-color: #26364C;

  /* Backward Compatibility Mappings */
  --navy-950: #080F1E;
  --navy-900: #0B1425;
  --navy-850: #0E1A32;
  --navy-800: #111D30;
  --navy-750: #15243C;
  --navy-700: #192943;
  --navy-600: #26364C;

  /* Text & Slate Contrast Hierarchy */
  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-400: #94A3B8;
  --slate-300: #CBD5E1;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
  --white: #FFFFFF;

  /* Accent Vibrance */
  --blue-600: #2563EB;
  --blue-500: #3B82F6;
  --blue-400: #60A5FA;
  --sky-400: #22D3EE;
  --sky-300: #67E8F9;
  --cyan-400: #22D3EE;
  --cyan-300: #67E8F9;
  --indigo-500: #6366F1;
  --emerald-500: #10B981;
  --emerald-400: #34D399;
  --amber-500: #F59E0B;
  --amber-400: #FBBF24;
  --red-500: #F43F5E;
  --red-400: #FB7185;

  /* Water Glassmorphism Surfaces & Translucency */
  --glass-bg-subtle: rgba(11, 20, 37, 0.45);
  --glass-bg: rgba(11, 20, 37, 0.65);
  --glass-bg-elevated: rgba(17, 29, 48, 0.70);
  --glass-bg-card: rgba(17, 29, 48, 0.60);
  --glass-bg-input: rgba(8, 15, 30, 0.60);
  --glass-border: rgba(38, 54, 76, 0.75);
  --glass-border-light: rgba(56, 189, 248, 0.22);
  --glass-border-specular: rgba(255, 255, 255, 0.18);
  --glass-border-focus: #22D3EE;
  --glass-blur: blur(20px) saturate(190%);
  --glass-blur-heavy: blur(28px) saturate(200%);

  /* Specular Reflections, Inner Light & Glows */
  --shadow-specular: inset 0 1px 1px 0 rgba(255, 255, 255, 0.16);
  --shadow-inset-depth: inset 0 2px 4px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(255, 255, 255, 0.05);
  --shadow-glass-sm: 0 4px 16px rgba(0, 0, 0, 0.35), inset 0 1px 1px 0 rgba(255, 255, 255, 0.12);
  --shadow-glass-md: 0 8px 28px rgba(0, 0, 0, 0.45), inset 0 1px 1px 0 rgba(255, 255, 255, 0.16);
  --shadow-glass-lg: 0 16px 48px rgba(0, 0, 0, 0.55), inset 0 1px 1px 0 rgba(255, 255, 255, 0.20);
  --shadow-glow-cyan: 0 0 24px rgba(34, 211, 238, 0.25);
  --shadow-glow-blue: 0 0 28px rgba(59, 130, 246, 0.32);
  --shadow-glow-combined: 0 0 0 1px rgba(34, 211, 238, 0.45), 0 8px 28px rgba(59, 130, 246, 0.30);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Typography */
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;

  /* Transitions */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================================================
   ACADEMIC LIGHT THEME (Apple / Linear Precision Minimalist Aesthetic)
   ========================================================================= */
body.theme-light, html[data-theme="light"] body {
  /* Semantic Tokens for Light Mode */
  --bg-main: #f8fafc;
  --bg-sidebar: #ffffff;
  --bg-panel: #ffffff;
  --bg-hover: #f1f5f9;
  --primary-blue: #2563eb;
  --secondary-cyan: #0284c7;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;

  /* Legacy Navy Mappings Inverted to Light Slate */
  --navy-950: #f8fafc;
  --navy-900: #ffffff;
  --navy-850: #f1f5f9;
  --navy-800: #e2e8f0;
  --navy-750: #cbd5e1;
  --navy-700: #94a3b8;
  --navy-600: #64748b;

  /* Inverted Slate & Text Hierarchy */
  --slate-600: #64748b;
  --slate-500: #475569;
  --slate-400: #334155;
  --slate-300: #1e293b;
  --slate-200: #0f172a;
  --slate-100: #020617;
  --white: #0f172a;

  /* Glassmorphic Surfaces for Light Mode */
  --glass-bg-subtle: rgba(241, 245, 249, 0.85);
  --glass-bg: rgba(255, 255, 255, 0.94);
  --glass-bg-elevated: #ffffff;
  --glass-bg-card: #ffffff;
  --glass-bg-input: #ffffff;
  --glass-border: rgba(203, 213, 225, 0.75);
  --glass-border-light: rgba(226, 232, 240, 0.95);
  --glass-border-specular: rgba(255, 255, 255, 0.9);
  --glass-border-focus: rgba(37, 99, 235, 0.7);

  /* Shadows for Light Mode */
  --shadow-specular: inset 0 1px 0 rgba(255, 255, 255, 1);
  --shadow-inset-depth: inset 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-glass-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-glass-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-glass-lg: 0 12px 28px rgba(15, 23, 42, 0.1), 0 4px 8px rgba(15, 23, 42, 0.04);

  background-color: #f8fafc;
  background-image:
    radial-gradient(ellipse 700px 480px at 12% 8%, rgba(56, 189, 248, 0.08), transparent 70%),
    radial-gradient(ellipse 850px 580px at 88% 92%, rgba(99, 102, 241, 0.06), transparent 70%),
    radial-gradient(circle 500px at 50% 45%, rgba(37, 99, 235, 0.04), transparent 60%),
    linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  color: #1e293b;
}

/* Sidebar Light Mode */
body.theme-light .sidebar {
  background: #ffffff;
  border-right: 1px solid #e2e8f0;
  box-shadow: 2px 0 12px rgba(0, 0, 0, 0.04);
}
body.theme-light .sidebar-header {
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .logo-main {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 60%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
body.theme-light .logo-sub {
  color: #0284c7;
  text-shadow: none;
}
body.theme-light .nav-section-title {
  color: #64748b;
}
body.theme-light .nav-item {
  color: #475569;
}
body.theme-light .nav-item:hover {
  background: #f1f5f9;
  color: #0f172a;
}
body.theme-light .nav-item.active {
  background: rgba(37, 99, 235, 0.10);
  color: #2563eb;
  border-left: 3px solid #2563eb;
  border-top: 1px solid rgba(37, 99, 235, 0.15);
  box-shadow: 0 1px 4px rgba(37, 99, 235, 0.08);
}
body.theme-light .nav-item.active svg {
  color: #2563eb;
  filter: none;
}
body.theme-light .nav-item.active .badge-count {
  background: rgba(37, 99, 235, 0.14);
  color: #2563eb;
  border-color: rgba(37, 99, 235, 0.25);
}
body.theme-light .badge-count {
  background: #f1f5f9;
  color: #64748b;
  border: 1px solid #e2e8f0;
}
body.theme-light .sidebar-footer {
  border-top: 1px solid #e2e8f0;
  background: #f8fafc;
}

/* Top Bar Light Mode */
body.theme-light .top-bar {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}
body.theme-light .search-box input {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #0f172a;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
}
body.theme-light .search-box input:focus {
  background: #ffffff;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
body.theme-light .search-box .search-icon {
  color: #64748b;
}
body.theme-light .search-kbd-hint {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: #64748b;
}
body.theme-light .select-pill {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
body.theme-light .select-pill:hover,
body.theme-light .select-pill:focus {
  border-color: #2563eb;
  color: #0f172a;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
body.theme-light .select-pill option {
  background: #ffffff;
  color: #0f172a;
}
body.theme-light .user-status-pill {
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  color: #334155;
}
body.theme-light .user-status-pill .user-status-dot {
  background: #10b981;
}

/* Reference Table Container & Toolbar Light Mode */
body.theme-light .reference-table-container {
  background: #f8fafc;
  border-right: 1px solid #e2e8f0;
}
body.theme-light .table-toolbar {
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .pill {
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  color: #475569;
}
body.theme-light .pill:hover {
  background: #e2e8f0;
  color: #0f172a;
  border-color: #cbd5e1;
}
body.theme-light .pill.active {
  background: #2563eb;
  color: #ffffff;
  border-color: #2563eb;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}
body.theme-light .table-counts {
  color: #64748b;
}
body.theme-light .table-wrapper {
  background: #ffffff;
}
body.theme-light .academic-table th {
  background: #f8fafc;
  color: #475569;
  border-bottom: 1px solid #e2e8f0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
body.theme-light .academic-table td {
  border-bottom: 1px solid #f1f5f9;
  color: #334155;
}
body.theme-light .academic-table tbody tr {
  border-bottom: 1px solid #f1f5f9;
}
body.theme-light .academic-table tbody tr:hover {
  background: #f8fafc !important;
  color: #0f172a;
}
body.theme-light .academic-table tbody tr.selected {
  background: #eff6ff !important;
  border-left: 3px solid #2563eb;
  box-shadow: inset 0 0 10px rgba(37, 99, 235, 0.06);
  color: #0f172a;
}
body.theme-light .academic-table tbody tr.checked {
  background: #f0fdf4 !important;
}
body.theme-light .batch-action-bar {
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  border-top: 1px solid #2563eb;
  color: #0f172a;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}
body.theme-light .batch-info {
  color: #2563eb;
}
body.theme-light .batch-select {
  background: #f8fafc;
  color: #0f172a;
  border: 1px solid #cbd5e1;
}
body.theme-light .batch-select option {
  background: #ffffff;
  color: #0f172a;
}

/* Empty State Vessel Light Mode */
body.theme-light .glass-empty-hero-card {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid #e2e8f0;
  box-shadow:
    0 16px 40px -10px rgba(15, 23, 42, 0.08),
    0 1px 3px rgba(15, 23, 42, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 1);
  color: #0f172a;
}
body.theme-light .glass-empty-hero-card:hover {
  border-color: #2563eb;
  box-shadow:
    0 20px 48px -10px rgba(37, 99, 235, 0.12),
    0 1px 4px rgba(15, 23, 42, 0.05);
}
body.theme-light .glass-empty-hero-card h3 {
  color: #0f172a;
}
body.theme-light .glass-empty-hero-card p {
  color: #64748b;
}
body.theme-light .empty-action-btn {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
body.theme-light .empty-action-btn:hover {
  background: #ffffff;
  border-color: #2563eb;
  color: #2563eb;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.12);
}

/* Metadata Inspector (Right Drawer) Light Mode */
body.theme-light .metadata-inspector {
  background: #ffffff;
  border-left: 1px solid #e2e8f0;
  box-shadow: -2px 0 12px rgba(0, 0, 0, 0.03);
  color: #1e293b;
}
body.theme-light .inspector-empty {
  color: #64748b;
}
body.theme-light .inspector-empty svg {
  color: #94a3b8;
}
body.theme-light .inspector-empty p {
  color: #64748b;
}
body.theme-light .inspector-header {
  border-bottom: 1px solid #e2e8f0;
  background: #ffffff;
}
body.theme-light .inspector-header h3 {
  color: #0f172a;
}
body.theme-light .inspector-form .form-label {
  color: #475569;
}
body.theme-light .inspector-form input,
body.theme-light .inspector-form textarea,
body.theme-light .inspector-form select {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #0f172a;
}
body.theme-light .inspector-form input:focus,
body.theme-light .inspector-form textarea:focus,
body.theme-light .inspector-form select:focus {
  background: #ffffff;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
body.theme-light .preview-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  color: #1e293b;
}
body.theme-light .preview-label {
  color: #64748b;
}
body.theme-light .preview-text {
  color: #0f172a;
}

/* Modals & Dropdowns Light Mode */
body.theme-light .modal-card {
  background: #ffffff;
  color: #0f172a;
  border: 1px solid #cbd5e1;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.16);
}
body.theme-light .modal-header {
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .modal-header h2 {
  color: #0f172a;
}
body.theme-light .modal-close {
  color: #64748b;
}
body.theme-light .modal-close:hover {
  color: #0f172a;
  background: #f1f5f9;
}
body.theme-light .modal-footer {
  border-top: 1px solid #e2e8f0;
}
body.theme-light .form-control {
  background: #ffffff;
  color: #0f172a;
  border: 1px solid #cbd5e1;
}
body.theme-light .form-control:focus {
  border-color: #2563eb;
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
body.theme-light .user-dropdown-menu {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
}
body.theme-light .user-dropdown-header {
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .user-name {
  color: #0f172a;
}
body.theme-light .user-email {
  color: #64748b;
}
body.theme-light .user-dropdown-item {
  color: #334155;
}
body.theme-light .user-dropdown-item:hover {
  background: #f1f5f9;
  color: #0f172a;
}
body.theme-light .user-dropdown-item.logout {
  color: #e11d48;
}
body.theme-light .user-dropdown-item.logout:hover {
  background: #fff1f2;
  color: #be123c;
}
body.theme-light .btn-secondary {
  background: #f1f5f9;
  color: #334155;
  border: 1px solid #cbd5e1;
}
body.theme-light .btn-secondary:hover {
  background: #e2e8f0;
  color: #0f172a;
}
body.theme-light .btn-ghost {
  color: #475569;
}
body.theme-light .btn-ghost:hover {
  background: #f1f5f9;
  color: #0f172a;
}

/* Secondary Views in Light Mode */
body.theme-light .pdf-toolbar {
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  color: #0f172a;
}
body.theme-light .pdf-doc-title,
body.theme-light .pdf-page-indicator {
  color: #475569;
}
body.theme-light .pdf-canvas-wrap {
  background: #f1f5f9;
}
body.theme-light .notes-sidebar {
  background: #ffffff;
  border-right: 1px solid #e2e8f0;
}
body.theme-light .notes-header {
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .notes-header h3 {
  color: #0f172a;
}
body.theme-light .notes-search-wrap {
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .notes-search-input {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #0f172a;
}
body.theme-light .note-item {
  border-bottom: 1px solid #f1f5f9;
  color: #334155;
}
body.theme-light .note-item:hover {
  background: #f8fafc;
}
body.theme-light .note-item.active {
  background: rgba(37, 99, 235, 0.08);
  border-left: 3px solid #2563eb;
}
body.theme-light .note-title {
  color: #0f172a;
}
body.theme-light .note-preview {
  color: #64748b;
}
body.theme-light .notes-editor {
  background: #ffffff;
}
body.theme-light .notes-editor-header {
  border-bottom: 1px solid #e2e8f0;
}
body.theme-light .note-title-input {
  color: #0f172a;
}
body.theme-light .note-body-textarea {
  color: #1e293b;
  background: #ffffff;
}
body.theme-light .styles-container,
body.theme-light .word-status-container,
body.theme-light .duplicate-resolver-container {
  color: #1e293b;
}
body.theme-light .styles-container h2,
body.theme-light .word-status-container h2,
body.theme-light .resolver-header h2 {
  color: #0f172a;
}
body.theme-light .style-card,
body.theme-light .word-status-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
}
body.theme-light .style-card-title,
body.theme-light .word-status-title {
  color: #0f172a;
}
body.theme-light ::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.4);
}
body.theme-light ::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 116, 139, 0.6);
}

/* =========================================================================
   AUTH & USER ACCOUNT STYLES
   ========================================================================= */
.user-account-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.btn-user-profile {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  padding: 4px 10px 4px 5px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--slate-200);
  font-size: 12.5px;
  font-weight: 500;
}

.btn-user-profile:hover {
  background: var(--glass-bg-elevated);
  border-color: var(--glass-border-focus);
}

.user-avatar-circle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
}

.user-dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 8px;
  width: 240px;
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass-lg);
  padding: 8px;
  z-index: 1000;
  animation: fadeInDown 0.18s cubic-bezier(0.16, 1, 0.3, 1);
}

.user-dropdown-header {
  padding: 8px 10px 10px;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 6px;
}

.user-dropdown-name {
  font-weight: 700;
  font-size: 13.5px;
  color: var(--slate-100);
}

.user-dropdown-email {
  font-size: 11.5px;
  color: var(--slate-400);
  word-break: break-all;
}

.user-dropdown-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 10.5px;
  padding: 2px 8px;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border-radius: var(--radius-full);
  margin-top: 6px;
  font-weight: 600;
}

.user-dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--slate-200);
  text-decoration: none;
  font-size: 12.5px;
  cursor: pointer;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: background 0.15s ease;
}

.user-dropdown-item:hover {
  background: var(--glass-bg-subtle);
  color: var(--white);
}

.user-dropdown-item.logout {
  color: #f43f5e;
  border-top: 1px solid var(--glass-border);
  margin-top: 4px;
}

.user-dropdown-item.logout:hover {
  background: rgba(244, 63, 94, 0.12);
}

/* Sync status badge in topbar */
.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--slate-400);
  padding: 4px 10px;
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
}

.sync-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.7);
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* Paper Folder Header in Reference Table */
.paper-folder-banner {
  background: var(--glass-bg-elevated);
  border-bottom: 1px solid var(--glass-border);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.paper-folder-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.paper-folder-color-bar {
  width: 4px;
  height: 36px;
  border-radius: var(--radius-full);
}

.paper-folder-title {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--slate-100);
}

.paper-folder-meta {
  font-size: 12px;
  color: var(--slate-400);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
}

.paper-folder-journal-badge {
  background: rgba(37, 99, 235, 0.18);
  color: var(--blue-400);
  border: 1px solid rgba(37, 99, 235, 0.3);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
}

.paper-folder-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

html, body {
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  font-family: var(--font-sans);
  background-color: #080F1E;
  background-image:
    radial-gradient(ellipse 950px 700px at 8% 5%, rgba(34, 211, 238, 0.18), transparent 70%),
    radial-gradient(ellipse 1100px 850px at 92% 95%, rgba(59, 130, 246, 0.22), transparent 70%),
    radial-gradient(circle 700px at 50% 40%, rgba(34, 211, 238, 0.09), transparent 60%),
    radial-gradient(ellipse 650px 500px at 75% 15%, rgba(99, 102, 241, 0.14), transparent 70%),
    linear-gradient(180deg, #080F1E 0%, #0B1425 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-size: 13.5px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Sleek Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  transition: background 0.2s ease;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Main Layout Structure */
.app-layout {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* =========================================================================
   SIDEBAR (FROSTED GLASS PANEL)
   ========================================================================= */

.sidebar {
  width: 255px;
  min-width: 255px;
  background: rgba(11, 20, 37, 0.70);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  color: var(--slate-300);
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 4px 0 32px rgba(0, 0, 0, 0.35), inset -1px 0 1px rgba(255, 255, 255, 0.04);
  z-index: 100;
  position: relative;
}

.sidebar-header {
  padding: 16px 14px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-wrap svg {
  filter: drop-shadow(0 4px 10px rgba(56, 189, 248, 0.35));
  transition: transform 0.25s var(--ease-spring);
}

.logo-wrap:hover svg {
  transform: scale(1.05) rotate(-2deg);
}

.logo-title {
  display: flex;
  flex-direction: column;
}

.logo-main {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 60%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.4px;
  color: var(--sky-400);
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

/* Sidebar Quick Actions */
.sidebar-quick-actions {
  padding: 12px 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* Sidebar Navigation */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.nav-section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--slate-500);
  padding: 14px 8px 5px;
  text-transform: uppercase;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 11px;
  color: var(--slate-400);
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all 0.2s var(--ease-spring);
  position: relative;
}

.nav-item svg {
  flex-shrink: 0;
  color: inherit;
  transition: transform 0.2s ease;
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: rgba(38, 54, 76, 0.7);
  transform: translateX(2px);
}

.nav-item.active {
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.24) 0%, rgba(34, 211, 238, 0.08) 100%);
  color: var(--text-primary);
  font-weight: 600;
  border-left: 3px solid var(--secondary-cyan);
  border-top: 1px solid rgba(34, 211, 238, 0.15);
  border-bottom: 1px solid rgba(34, 211, 238, 0.1);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.1), 0 4px 14px rgba(0, 0, 0, 0.35);
}

.nav-item.active svg {
  color: var(--secondary-cyan);
  filter: drop-shadow(0 0 8px rgba(34, 211, 238, 0.6));
}

.badge-count {
  margin-left: auto;
  font-size: 10.5px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);
  color: var(--slate-300);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-item.active .badge-count {
  background: rgba(56, 189, 248, 0.2);
  color: var(--sky-300);
  border-color: rgba(56, 189, 248, 0.35);
}

.badge-alert {
  margin-left: auto;
  background: linear-gradient(135deg, var(--amber-500), var(--amber-600));
  color: #000;
  font-size: 10px;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.4);
}

/* Collection Tree */
.collection-tree {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.collection-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 11px 7px 20px;
  font-size: 12px;
  color: var(--slate-400);
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all 0.2s var(--ease-spring);
}

.collection-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--white);
  transform: translateX(2px);
}

.collection-item.active {
  background: rgba(56, 189, 248, 0.12);
  color: var(--sky-300);
  font-weight: 600;
  border: 1px solid rgba(56, 189, 248, 0.25);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.collection-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px 14px;
  border-top: 1px solid var(--glass-border);
  font-size: 11px;
  background: rgba(0, 0, 0, 0.15);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--slate-400);
  font-weight: 500;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--emerald-400);
  border-radius: 50%;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.6);
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid var(--emerald-400);
  opacity: 0.6;
  animation: pulseRadar 2s infinite ease-out;
}

@keyframes pulseRadar {
  0% { transform: scale(0.9); opacity: 0.8; }
  100% { transform: scale(1.8); opacity: 0; }
}

/* =========================================================================
   MAIN APP CONTENT & TOP BAR
   ========================================================================= */

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: transparent;
  position: relative;
}

/* Top Action Bar (Glass Header) */
.top-bar {
  height: 56px;
  background: rgba(11, 20, 37, 0.72);
  backdrop-filter: blur(20px) saturate(190%);
  -webkit-backdrop-filter: blur(20px) saturate(190%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  z-index: 90;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.30), inset 0 1px 1px rgba(255, 255, 255, 0.10);
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 540px;
  display: flex;
  align-items: center;
}

.search-box .search-icon {
  position: absolute;
  left: 12px;
  color: var(--slate-500);
  pointer-events: none;
  transition: color 0.2s ease;
}

.search-box input {
  width: 100%;
  padding: 8px 68px 8px 38px;
  font-size: 13px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  background: var(--glass-bg-input);
  box-shadow: var(--shadow-inset-depth);
  color: var(--slate-100);
  outline: none;
  transition: all 0.25s var(--ease-spring);
  font-family: inherit;
}

.search-box input:focus {
  border-color: var(--sky-400);
  background: rgba(10, 16, 32, 0.85);
  box-shadow: var(--shadow-inset-depth), 0 0 0 3px rgba(56, 189, 248, 0.2), var(--shadow-glow-cyan);
}

.search-box input:focus + .search-icon {
  color: var(--sky-400);
}

.search-kbd-hint {
  position: absolute;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--slate-500);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
}

.btn-clear-search {
  position: absolute;
  right: 56px;
  background: none;
  border: none;
  color: var(--slate-400);
  font-size: 16px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 50%;
  line-height: 1;
  transition: color 0.15s ease;
}

.btn-clear-search:hover {
  color: var(--white);
}

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.select-pill {
  padding: 7px 14px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border-light);
  background: var(--glass-bg-elevated);
  box-shadow: var(--shadow-specular);
  color: var(--slate-200);
  cursor: pointer;
  outline: none;
  transition: all 0.2s var(--ease-spring);
}

.select-pill:hover, .select-pill:focus {
  border-color: var(--sky-400);
  color: var(--white);
  box-shadow: var(--shadow-specular), 0 0 16px rgba(56, 189, 248, 0.2);
}

.select-pill option {
  background: var(--navy-900);
  color: var(--slate-200);
}

/* Body / Views Container */
.content-body {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.app-view {
  display: none;
  height: 100%;
  width: 100%;
  overflow-y: auto;
  animation: fadeIn 0.25s var(--ease-spring);
}

.app-view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =========================================================================
   VIEW 1: REFERENCES SPLIT (TABLE + INSPECTOR)
   ========================================================================= */

.view-split {
  display: flex;
  height: 100%;
  overflow: hidden;
}

.reference-table-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--glass-border);
  position: relative;
}

.table-toolbar {
  padding: 10px 20px;
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
}

.filter-pills {
  display: flex;
  gap: 6px;
}

.pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--slate-400);
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.pill:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.15);
}

.pill.active {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.8), rgba(29, 78, 216, 0.9));
  color: var(--white);
  border-color: var(--sky-400);
  font-weight: 600;
  box-shadow: var(--shadow-specular), 0 4px 14px rgba(37, 99, 235, 0.35);
}

.table-counts {
  font-size: 12px;
  font-weight: 500;
  color: var(--slate-400);
}

/* Floating Batch Action Bar */
.batch-action-bar {
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  color: var(--white);
  padding: 9px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--glass-border-light);
  border-top: 1px solid rgba(56, 189, 248, 0.3);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.15);
  animation: slideDownBar 0.22s var(--ease-spring);
  z-index: 20;
}

@keyframes slideDownBar {
  from { transform: translateY(-100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.batch-info {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--sky-300);
}

.batch-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
}

.batch-select {
  font-size: 11.5px;
  padding: 4px 10px;
  background: rgba(14, 22, 43, 0.85);
  color: var(--white);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
}

.batch-select option {
  background: var(--navy-900);
  color: var(--white);
}

/* Table Wrapper & Academic Table */
.table-wrapper {
  flex: 1;
  overflow-y: auto;
  position: relative;
  background: rgba(8, 15, 30, 0.45);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* Water Glassmorphism Floating Empty State Vessel */
.glass-empty-hero-card {
  max-width: 520px;
  margin: 50px auto;
  padding: 38px 28px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.01) 100%), rgba(17, 29, 48, 0.62);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: 18px;
  box-shadow:
    0 24px 60px -12px rgba(0, 0, 0, 0.6),
    0 0 35px -5px rgba(34, 211, 238, 0.18),
    inset 0 1px 1px 0 rgba(255, 255, 255, 0.22);
  text-align: center;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.glass-empty-hero-card:hover {
  border-color: rgba(34, 211, 238, 0.45);
  box-shadow:
    0 28px 70px -10px rgba(0, 0, 0, 0.65),
    0 0 45px -5px rgba(34, 211, 238, 0.25),
    inset 0 1px 1px 0 rgba(255, 255, 255, 0.30);
  transform: translateY(-2px);
}
.empty-action-btn {
  background: rgba(17, 29, 48, 0.75);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.15), 0 4px 14px rgba(0, 0, 0, 0.3);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: all 0.2s ease;
}
.empty-action-btn:hover {
  background: rgba(25, 41, 67, 0.9);
  border-color: var(--secondary-cyan);
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.3);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.academic-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 12.5px;
}

.academic-table th {
  background: rgba(11, 17, 34, 0.92);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--slate-400);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 10px 14px;
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.academic-table td {
  padding: 11px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--slate-300);
  vertical-align: middle;
  transition: all 0.15s ease;
}

.academic-table tbody tr {
  cursor: pointer;
  transition: all 0.18s var(--ease-spring);
  border-left: 3px solid transparent;
}

.academic-table tbody tr:hover {
  background: var(--bg-hover) !important;
  color: var(--text-primary);
}

.academic-table tbody tr.selected {
  background: rgba(59, 130, 246, 0.18) !important;
  border-left: 3px solid var(--secondary-cyan);
  box-shadow: inset 0 0 20px rgba(34, 211, 238, 0.1);
  color: var(--text-primary);
}

.academic-table tbody tr.checked {
  background: rgba(59, 130, 246, 0.12) !important;
}

/* Mendeley-style Row Icons */
.mendeley-read-dot {
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  display: inline-block;
  transition: transform 0.2s var(--ease-spring);
  user-select: none;
}
.mendeley-read-dot:hover {
  transform: scale(1.4);
}
.mendeley-read-dot.is-unread {
  color: var(--emerald-400);
  text-shadow: 0 0 8px rgba(52, 211, 153, 0.7);
}
.mendeley-read-dot.is-read {
  color: var(--slate-600);
}

.mendeley-star-btn {
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  display: inline-block;
  transition: transform 0.2s var(--ease-spring), color 0.15s ease;
  user-select: none;
}
.mendeley-star-btn:hover {
  transform: scale(1.35);
}
.mendeley-star-btn.is-fav {
  color: var(--amber-400);
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.7);
}
.mendeley-star-btn.not-fav {
  color: var(--slate-600);
}

.mendeley-pdf-icon {
  font-size: 14px;
  display: inline-block;
  user-select: none;
}
.mendeley-pdf-icon.has-file {
  color: var(--red-400);
  cursor: pointer;
  transition: transform 0.2s var(--ease-spring);
  filter: drop-shadow(0 0 6px rgba(244, 63, 94, 0.4));
}
.mendeley-pdf-icon.has-file:hover {
  transform: scale(1.3);
}
.mendeley-pdf-icon.no-file {
  color: var(--slate-600);
  cursor: default;
}

/* Paper cell formatting */
.paper-title-cell {
  font-weight: 600;
  color: var(--slate-100);
  line-height: 1.4;
  font-size: 13px;
}

.paper-title-cell i, .paper-title-cell em {
  font-style: italic;
  color: var(--sky-300);
}

.paper-title-cell sub, .paper-title-cell sup {
  font-size: 0.8em;
  line-height: 0;
}

.paper-doi-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--sky-400);
  margin-top: 3px;
  opacity: 0.85;
}

.paper-type-badge {
  font-size: 10px;
  font-weight: 700;
  background: rgba(56, 189, 248, 0.12);
  color: var(--sky-300);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  text-transform: capitalize;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

/* =========================================================================
   METADATA INSPECTOR (RIGHT DRAWER)
   ========================================================================= */

.metadata-inspector {
  width: 390px;
  min-width: 390px;
  background: rgba(17, 29, 48, 0.70);
  backdrop-filter: blur(28px) saturate(190%);
  -webkit-backdrop-filter: blur(28px) saturate(190%);
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  box-shadow: -6px 0 36px rgba(0, 0, 0, 0.35), inset 1px 0 1px rgba(255, 255, 255, 0.06);
  position: relative;
}

.inspector-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 28px;
  color: var(--slate-500);
  font-size: 13px;
  gap: 12px;
}

.inspector-empty svg {
  color: var(--slate-500);
  opacity: 0.6;
}

.inspector-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0, 0, 0, 0.15);
}

.item-type-select {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--white);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  background: var(--glass-bg-elevated);
  box-shadow: var(--shadow-specular);
  outline: none;
  cursor: pointer;
}

.item-type-select option {
  background: var(--navy-900);
  color: var(--white);
}

.header-tools {
  display: flex;
  gap: 6px;
}

.inspector-form {
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-group label {
  font-size: 11px;
  font-weight: 700;
  color: var(--slate-400);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.form-control {
  width: 100%;
  padding: 7px 11px;
  font-size: 12.5px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--glass-bg-input);
  box-shadow: var(--shadow-inset-depth);
  color: var(--slate-100);
  outline: none;
  font-family: inherit;
  transition: all 0.2s var(--ease-spring);
}

.form-control:focus {
  border-color: var(--sky-400);
  background: rgba(10, 16, 32, 0.85);
  box-shadow: var(--shadow-inset-depth), 0 0 0 2px rgba(56, 189, 248, 0.2), var(--shadow-glow-cyan);
}

textarea.form-control {
  resize: vertical;
  line-height: 1.5;
}

.form-row {
  display: flex;
  gap: 8px;
}

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

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

.input-with-action {
  display: flex;
  gap: 6px;
}

/* Authors List */
.authors-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 140px;
  overflow-y: auto;
  padding: 6px;
  background: var(--glass-bg-input);
  box-shadow: var(--shadow-inset-depth);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
}

.author-chip {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  font-size: 11.5px;
  gap: 4px;
}

.btn-link {
  background: none;
  border: none;
  color: var(--sky-400);
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  padding: 3px 0;
  transition: color 0.15s ease;
}

.btn-link:hover {
  color: var(--sky-300);
  text-decoration: underline;
}

/* Citation Preview Card with 1-Click Copy */
.citation-preview-card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-lg);
  padding: 12px 14px;
  margin-top: 10px;
  box-shadow: var(--shadow-specular), 0 4px 16px rgba(0, 0, 0, 0.25);
  position: relative;
}

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

.preview-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--sky-400);
}

.btn-copy-preview {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border-light);
  color: var(--slate-300);
  font-size: 10.5px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.btn-copy-preview:hover {
  background: rgba(56, 189, 248, 0.15);
  color: var(--white);
  border-color: var(--sky-400);
  transform: translateY(-1px);
}

.btn-copy-preview.copied {
  background: rgba(16, 185, 129, 0.2);
  color: var(--emerald-400);
  border-color: var(--emerald-400);
}

.preview-text {
  font-size: 12px;
  line-height: 1.5;
  color: var(--slate-100);
  margin-top: 4px;
  font-family: var(--font-sans);
  word-break: break-word;
}

.preview-text em, .preview-text i {
  font-style: italic;
  color: var(--sky-300);
}

/* =========================================================================
   VIEW 2: PDF WORKSPACE
   ========================================================================= */

.pdf-workspace-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.pdf-toolbar {
  height: 48px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--white);
  padding: 0 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  z-index: 10;
}

.pdf-page-indicator {
  font-weight: 500;
  color: var(--slate-300);
}

.pdf-zoom-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--glass-border);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  color: var(--sky-300);
}

.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--glass-border-light);
}

.pdf-doc-title {
  padding: 0 16px;
  font-size: 12px;
  color: var(--slate-400);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 360px;
  font-weight: 500;
}

.pdf-canvas-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 28px;
  background: rgba(5, 8, 16, 0.85);
  box-shadow: inset 0 4px 30px rgba(0, 0, 0, 0.6);
}

#pdf-render-canvas {
  background: var(--white);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  max-width: 100%;
}

/* =========================================================================
   VIEW 3: DUPLICATE RESOLVER
   ========================================================================= */

.duplicate-resolver-container {
  padding: 28px;
  max-width: 980px;
  margin: 0 auto;
}

.resolver-header {
  margin-bottom: 24px;
}

.resolver-header h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 6px;
}

.resolver-header p {
  font-size: 13px;
  color: var(--slate-400);
  line-height: 1.5;
  margin-bottom: 14px;
}

.duplicate-pairs-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.dup-pair-card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-xl);
  padding: 20px;
  box-shadow: var(--shadow-glass-md);
  transition: transform 0.2s var(--ease-spring);
}

.dup-pair-card:hover {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: var(--shadow-glass-lg), 0 0 20px rgba(56, 189, 248, 0.12);
}

.dup-pair-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--glass-border);
}

.similarity-badge {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.25), rgba(217, 119, 6, 0.35));
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: var(--amber-400);
  font-weight: 700;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.2);
}

.dup-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.dup-column {
  background: var(--glass-bg-input);
  box-shadow: var(--shadow-inset-depth);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 14px;
}

.dup-col-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--sky-400);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

.dup-paper-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 6px;
  line-height: 1.4;
}

.dup-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* =========================================================================
   VIEW 4: RESEARCH NOTES WORKSPACE
   ========================================================================= */

.notes-workspace-layout {
  display: flex;
  height: 100%;
}

.notes-sidebar {
  width: 290px;
  border-right: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  display: flex;
  flex-direction: column;
}

.notes-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.notes-header h3 {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.notes-search-wrap {
  padding: 8px 12px;
  border-bottom: 1px solid var(--glass-border);
}

.notes-search-input {
  width: 100%;
  padding: 6px 12px;
  font-size: 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg-input);
  color: var(--slate-100);
  outline: none;
}

.notes-search-input:focus {
  border-color: var(--sky-400);
}

.notes-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.note-item {
  padding: 13px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: all 0.18s var(--ease-spring);
  border-left: 3px solid transparent;
}

.note-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.note-item.active {
  background: rgba(37, 99, 235, 0.18);
  border-left: 3px solid var(--sky-400);
}

.note-item-title {
  font-weight: 600;
  color: var(--white);
  font-size: 13px;
  margin-bottom: 3px;
}

.note-item-snippet {
  font-size: 11.5px;
  color: var(--slate-400);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.notes-editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 28px 36px;
  background: transparent;
}

.note-editor-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}

.note-title-input {
  flex: 1;
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  border: none;
  background: transparent;
  outline: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.note-title-input:focus {
  border-bottom-color: var(--sky-400);
}

.note-content-input {
  flex: 1;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  padding: 20px;
  outline: none;
  resize: none;
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate-100);
  font-family: inherit;
  box-shadow: var(--shadow-inset-depth);
  transition: border-color 0.2s ease;
}

.note-content-input:focus {
  border-color: var(--sky-400);
  box-shadow: var(--shadow-inset-depth), 0 0 20px rgba(56, 189, 248, 0.15);
}

.note-editor-footer {
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.note-metrics {
  font-size: 11.5px;
  color: var(--slate-400);
  display: flex;
  align-items: center;
  gap: 8px;
}

.note-save-status {
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald-400);
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-size: 10.5px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-full);
}

/* =========================================================================
   VIEW 5: STYLES GRID & WORD ADD-IN
   ========================================================================= */

.styles-container, .word-status-container {
  padding: 28px;
  max-width: 960px;
  margin: 0 auto;
}

.styles-container h2, .word-status-container h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 6px;
}

.styles-container p {
  color: var(--slate-400);
  font-size: 13px;
  margin-bottom: 20px;
}

.styles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.style-card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-glass-sm);
  transition: all 0.2s var(--ease-spring);
}

.style-card:hover {
  transform: translateY(-2px);
  border-color: var(--sky-400);
  box-shadow: var(--shadow-glass-md), 0 0 20px rgba(56, 189, 248, 0.12);
}

.style-card-title {
  font-weight: 700;
  font-size: 13.5px;
  color: var(--white);
  margin-bottom: 4px;
}

.style-card-desc {
  font-size: 11.5px;
  color: var(--slate-400);
  line-height: 1.4;
}

.status-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.status-card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-glass-sm);
}

.status-card h3 {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

/* =========================================================================
   BUTTONS & COMMON CONTROLS
   ========================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 12.5px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
  font-family: inherit;
  outline: none;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 55%, #1d4ed8 100%);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-specular), 0 4px 16px rgba(37, 99, 235, 0.45);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 55%, #2563eb 100%);
  transform: translateY(-1.5px);
  box-shadow: var(--shadow-specular), 0 6px 22px rgba(37, 99, 235, 0.6);
}

.btn-primary:active {
  transform: translateY(0.5px);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--slate-200);
  border-color: var(--glass-border-light);
  box-shadow: var(--shadow-specular);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.btn-danger {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.85), rgba(185, 28, 28, 0.95));
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-specular), 0 4px 14px rgba(220, 38, 38, 0.4);
}

.btn-danger:hover {
  background: linear-gradient(135deg, rgba(248, 113, 113, 0.9), rgba(220, 38, 38, 1));
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 11px;
  font-size: 11.5px;
}

.btn-xs {
  padding: 3px 8px;
  font-size: 10.5px;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--slate-400);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 7px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
}

.btn-icon.danger:hover {
  color: var(--red-400);
  background: rgba(244, 63, 94, 0.15);
}

.btn-text {
  background: none;
  border: none;
  color: var(--slate-400);
  cursor: pointer;
  font-size: 11.5px;
  font-weight: 500;
  padding: 3px 6px;
}

.btn-text:hover {
  color: var(--white);
  text-decoration: underline;
}

/* =========================================================================
   MODALS (FROSTED GLASS DIALOGS)
   ========================================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 15, 0.75);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
  animation: modalFadeIn 0.2s var(--ease-spring);
}

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

.modal-overlay.hidden {
  display: none !important;
}

.modal-card {
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), var(--shadow-specular);
  width: 100%;
  max-width: 460px;
  overflow: hidden;
  animation: modalPopIn 0.25s var(--ease-spring);
}

@keyframes modalPopIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0, 0, 0, 0.15);
}

.modal-header h2 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 800;
  color: var(--white);
}

.btn-close-modal {
  background: none;
  border: none;
  font-size: 22px;
  color: var(--slate-400);
  cursor: pointer;
  line-height: 1;
  transition: color 0.15s ease;
}

.btn-close-modal:hover {
  color: var(--white);
}

.modal-body {
  padding: 20px;
}

.tab-buttons {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--glass-border);
  padding-bottom: 8px;
}

.tab-btn {
  background: none;
  border: none;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--slate-400);
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.tab-btn:hover {
  color: var(--white);
}

.tab-btn.active {
  color: var(--sky-400);
  border-bottom: 2px solid var(--sky-400);
}

.import-tab-content {
  display: none;
}

.import-tab-content.active {
  display: block;
}

.modal-instruction {
  font-size: 12.5px;
  color: var(--slate-400);
  margin-bottom: 12px;
  line-height: 1.45;
}

.file-dropzone {
  border: 2px dashed rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  padding: 32px 20px;
  text-align: center;
  color: var(--slate-400);
  cursor: pointer;
  background: rgba(56, 189, 248, 0.03);
  transition: all 0.25s var(--ease-spring);
}

.file-dropzone:hover {
  border-color: var(--sky-400);
  background: rgba(56, 189, 248, 0.08);
  color: var(--white);
  box-shadow: 0 0 24px rgba(56, 189, 248, 0.15);
}

/* Full Viewport Drag-and-Drop Overlay */
.drag-drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(6, 9, 19, 0.85);
  backdrop-filter: var(--glass-blur-heavy);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
  animation: fadeIn 0.15s ease-out;
}

.drop-modal-card {
  background: var(--glass-bg-elevated);
  border: 2px dashed var(--sky-400);
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  max-width: 500px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), var(--shadow-glow-cyan);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.drop-modal-card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--white);
}

.drop-modal-card p {
  font-size: 13px;
  color: var(--slate-400);
  line-height: 1.5;
}

.drop-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--sky-300);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 4px 14px;
  border-radius: var(--radius-full);
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--glass-bg-elevated);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  color: var(--white);
  padding: 12px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border-light);
  font-size: 12.5px;
  font-weight: 600;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.55), 0 0 20px rgba(56, 189, 248, 0.2);
  z-index: 2000;
  transition: all 0.25s var(--ease-spring);
  transform: translateY(0);
}

.toast.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px);
}

.hidden {
  display: none !important;
}

/* Cards & Badges */
.card {
  background: var(--glass-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-lg);
  padding: 18px;
  box-shadow: var(--shadow-glass-sm);
}

.glass-hero-card {
  background: radial-gradient(ellipse 650px 300px at 0% 0%, rgba(34, 211, 238, 0.12), transparent 70%),
              radial-gradient(ellipse 550px 300px at 100% 100%, rgba(59, 130, 246, 0.15), transparent 70%),
              rgba(17, 29, 48, 0.75) !important;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid rgba(34, 211, 238, 0.28) !important;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.14) !important;
}

.badge {
  display: inline-flex;
  align-items: center;
  font-size: 10.5px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: var(--radius-full);
}

.badge-success {
  background: rgba(16, 185, 129, 0.18);
  color: var(--emerald-400);
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.badge-neutral {
  background: rgba(255, 255, 255, 0.08);
  color: var(--slate-300);
  border: 1px solid var(--glass-border);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.18);
  color: var(--amber-400);
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.btn-export-choice {
  justify-content: flex-start;
  gap: 12px;
  padding: 11px 16px;
  font-size: 13px;
  border-color: var(--glass-border-light);
  background: rgba(255, 255, 255, 0.04);
  transition: all 0.2s var(--ease-spring);
}

.btn-export-choice:hover {
  border-color: var(--sky-400);
  background: rgba(56, 189, 248, 0.12);
  color: var(--white);
  transform: translateY(-1px);
}

/* =========================================================================
   MOBILE RESPONSIVENESS & TOUCH OPTIMIZATION (Citaphir Mobile Engine)
   ========================================================================= */

.btn-mobile-menu,
.btn-close-sidebar,
.btn-close-inspector,
.mobile-bottom-nav,
.mobile-overlay {
  display: none;
}

@media (max-width: 900px) {
  body {
    overflow-y: auto;
    height: auto;
    min-height: 100vh;
    -webkit-tap-highlight-color: transparent;
  }

  .app-layout {
    flex-direction: column;
    height: auto;
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
    position: relative;
  }

  /* 1. Mobile Off-Canvas Sidebar Drawer */
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 290px;
    max-width: 86vw;
    z-index: 1300;
    transform: translateX(-100%);
    transition: transform 0.28s var(--ease-spring);
    box-shadow: 6px 0 35px rgba(0, 0, 0, 0.6);
    border-right: 1px solid var(--glass-border-light);
  }

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

  .sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 14px;
  }

  .btn-close-sidebar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
  }

  /* 2. Backdrop Overlays */
  .mobile-overlay {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(4, 7, 15, 0.7);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 1200;
    opacity: 1;
    transition: opacity 0.25s ease;
  }

  .mobile-overlay.hidden {
    opacity: 0;
    pointer-events: none;
    display: none !important;
  }

  /* 3. Main Content & Top Bar */
  .main-content {
    flex: 1;
    width: 100%;
    padding-bottom: 74px;
    overflow-x: hidden;
  }

  .top-bar {
    padding: 10px 14px;
    gap: 10px;
    position: sticky;
    top: 0;
    z-index: 800;
  }

  .btn-mobile-menu {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--glass-bg-elevated);
    border: 1px solid var(--glass-border-light);
    border-radius: var(--radius-md);
    color: var(--slate-200);
    cursor: pointer;
    flex-shrink: 0;
  }

  .search-box {
    flex: 1;
    min-width: 0;
  }

  .top-bar-actions {
    gap: 8px;
    flex-shrink: 0;
  }

  .top-bar-actions select.select-pill {
    max-width: 110px;
    font-size: 11.5px;
    padding: 6px 8px;
  }

  .top-bar-actions #btn-export-all span {
    display: none;
  }

  /* 4. Table to Mobile Academic Cards */
  .view-split {
    flex-direction: column;
    height: auto;
    overflow: visible;
  }

  .reference-table-container {
    width: 100%;
    height: auto;
    padding: 12px;
  }

  .table-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-bottom: 12px;
  }

  .filter-pills {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 6px;
    display: flex;
    gap: 6px;
  }

  .filter-pills .pill {
    white-space: nowrap;
    padding: 6px 14px;
  }

  .table-wrapper {
    overflow-x: visible;
    border: none;
    background: transparent;
  }

  .academic-table {
    display: block;
    width: 100%;
  }

  .academic-table thead {
    display: none;
  }

  .academic-table tbody {
    display: block;
    width: 100%;
  }

  .academic-table tr {
    display: block;
    background: var(--glass-bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 14px;
    margin-bottom: 12px;
    box-shadow: var(--shadow-glass-sm);
  }

  .academic-table td {
    display: block;
    padding: 3px 0;
    border: none;
  }

  .academic-table td:nth-child(1),
  .academic-table td:nth-child(2),
  .academic-table td:nth-child(3),
  .academic-table td:nth-child(4),
  .academic-table td:nth-child(5),
  .academic-table td:nth-child(8) {
    display: inline-block;
    vertical-align: middle;
    margin-right: 6px;
  }

  .academic-table td:nth-child(8) {
    font-weight: 700;
    color: var(--sky-300);
    font-size: 11px;
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 7px;
    border-radius: 4px;
  }

  .academic-table td:nth-child(6) {
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.4;
    margin: 8px 0 4px;
  }

  .academic-table td:nth-child(7) {
    font-size: 12.5px;
    color: var(--slate-400);
    line-height: 1.4;
  }

  .academic-table td:nth-child(9) {
    font-size: 11.5px;
    color: var(--slate-500);
    font-style: italic;
    margin-top: 2px;
  }

  .academic-table td:nth-child(10) {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px dashed var(--glass-border);
  }

  /* 5. Mobile Bottom Sheet for Metadata Inspector */
  .metadata-inspector {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-height: 84vh;
    border-radius: 20px 20px 0 0;
    background: var(--navy-900);
    z-index: 1250;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.6);
    transform: translateY(100%);
    transition: transform 0.3s var(--ease-spring);
    border-left: none;
    border-top: 1px solid var(--glass-border-light);
    overflow-y: auto;
  }

  .metadata-inspector.mobile-open {
    transform: translateY(0);
  }

  .btn-close-inspector {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--slate-300);
  }

  /* 6. Mobile Bottom Navigation Bar */
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--glass-bg-elevated);
    backdrop-filter: var(--glass-blur-heavy);
    -webkit-backdrop-filter: var(--glass-blur-heavy);
    border-top: 1px solid var(--glass-border-light);
    z-index: 1100;
    justify-content: space-around;
    align-items: center;
    padding-bottom: env(safe-area-inset-bottom, 0);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.4);
  }

  .mobile-nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    background: none;
    border: none;
    color: var(--slate-400);
    font-size: 10px;
    font-weight: 600;
    padding: 6px 0;
    cursor: pointer;
    transition: color 0.15s ease;
  }

  .mobile-nav-btn.active {
    color: var(--sky-400);
  }

  .mobile-nav-add {
    position: relative;
    top: -12px;
  }

  .mobile-add-circle {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.5), var(--shadow-specular);
    transition: transform 0.15s ease;
  }

  .mobile-add-circle:active {
    transform: scale(0.92);
  }

  .modal-card {
    width: 95vw !important;
    max-height: 88vh !important;
    padding: 16px !important;
    border-radius: var(--radius-lg) !important;
  }
}

/* =========================================================================
   Skeleton Loading Animation & UI Polish (a11y-architect & code-simplifier)
   ========================================================================= */

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton-line {
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(90deg, rgba(148, 163, 184, 0.1) 25%, rgba(148, 163, 184, 0.22) 50%, rgba(148, 163, 184, 0.1) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.8s infinite ease-in-out;
}

.skeleton-row td {
  padding: 16px 12px;
  border-bottom: 1px solid var(--border-color);
}

/* Modal accessibility focus outlines */
.modal-overlay:focus-visible,
.modal-card:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--sky-400) !important;
  outline-offset: 2px !important;
}

/* Quick Action Empty State Buttons */
.empty-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--glass-bg-subtle);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--slate-200);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  margin: 6px 4px;
}
.empty-action-btn:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--sky-400);
  color: #fff;
  transform: translateY(-1px);
}