/* Premium CSS Design System - Warm Cream & Terracotta with Cool Accent Highlights */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Lora:ital,wght@0,400;0,500;0,600;1,400&display=swap');

:root {
  /* Main UI Archetype: Warm Latte / Cream */
  --bg-app: #FAF7F2;
  --bg-sidebar: #F2ECE1;
  --bg-card: #FFFFFF;
  --text-main: #332C26;
  --text-muted: #6B5E53;
  --border-color: #E5DCCF;
  --border-focus: #C85C38;
  
  /* Primary Warm Accent Colors */
  --color-primary: #C85C38; /* Terracotta */
  --color-primary-hover: #AF4927;
  --color-primary-light: #FCEFEA;
  --color-amber: #E5A93C; /* Amber */
  --color-amber-light: #FEF6E5;
  --color-tan: #8C7B6B; /* Control / Tan */
  --color-tan-light: #F4EFEA;
  
  /* Cool Accent Colors (For Highlighting Key Tokens) */
  --color-cool-teal: #008080; /* Teal Accent */
  --color-cool-teal-light: #E1F2F2;
  
  --color-cool-indigo: #4F46E5; /* Indigo Accent */
  --color-cool-indigo-light: #EEF2FF;

  --shadow-sm: 0 1px 3px rgba(51, 44, 38, 0.05);
  --shadow-md: 0 4px 12px rgba(51, 44, 38, 0.08);
  --shadow-lg: 0 12px 24px rgba(51, 44, 38, 0.12);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', Georgia, serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
  display: flex;
}

/* App Layout Flexbox (allows resizing) */
.app-container {
  display: flex;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

/* LEFT SIDEBAR: Controls & Preferences */
.sidebar {
  background-color: var(--bg-sidebar);
  width: 320px;
  min-width: 250px;
  max-width: 600px;
  padding: 24px 24px 60px; /* bottom padding makes room for info bar */
  display: flex;
  flex-direction: column;
  gap: 28px;
  overflow-y: auto;
  z-index: 10;
  flex-shrink: 0;
  position: relative;
}

/* RESIZE DRAG HANDLE */
.resize-handle {
  width: 6px;
  background-color: var(--border-color);
  cursor: col-resize;
  transition: background-color 0.15s ease;
  z-index: 20;
  flex-shrink: 0;
}

.resize-handle:hover,
.resize-handle.resizing {
  background-color: var(--color-primary);
}

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

.brand-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 1.1rem;
}

.brand-logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.brand-title {
  font-size: 1.6rem;
  font-weight: 400;
  font-family: 'Special Elite', 'Courier New', monospace;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.sidebar-section {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Info bar — sits at the bottom of the sidebar */
.bug-btn {
  position: absolute;
  bottom: 44px;
  left: 0;
  right: 0;
  height: 36px;
  border: none;
  border-top: 1px solid var(--border-color);
  background: var(--bg-sidebar);
  color: var(--text-muted);
  font-size: 0.73rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-family: var(--font-sans);
  opacity: 0.7;
  transition: all 0.15s;
}
.bug-btn:hover {
  opacity: 1;
  background: var(--bg-card);
  color: var(--text-main);
}

.bug-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(51,44,38,0.4);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bug-modal {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 28px;
  width: 380px;
  max-width: 90vw;
  box-shadow: 0 8px 32px rgba(51,44,38,0.18);
  position: relative;
}

.bug-modal h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 0 0 4px;
}

.bug-modal-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 14px;
}

.bug-modal textarea {
  width: 100%;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: var(--text-main);
  background: var(--bg-app);
  resize: vertical;
  box-sizing: border-box;
  outline: none;
}

.bug-modal textarea:focus {
  border-color: var(--color-tan);
}

.bug-modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
}

.bug-modal-note {
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0.7;
}

.bug-modal-submit {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 7px;
  padding: 8px 18px;
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-sans);
}

.bug-modal-submit:hover { background: var(--color-primary-hover); }
.bug-modal-submit:disabled { opacity: 0.6; cursor: default; }

.bug-modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  font-size: 0.9rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.info-btn {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 44px;
  border-radius: 0 0 0 0;
  border: none;
  border-top: 1px solid var(--border-color);
  background: var(--bg-sidebar);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-family: var(--font-sans);
}
.info-btn:hover {
  background: var(--bg-card);
  color: var(--text-main);
}

/* Info modal overlay */
.info-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(3px);
  z-index: 500;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.info-modal-overlay.open { display: flex; }

.info-modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 36px 48px 44px;
  max-width: 720px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 24px 64px rgba(0,0,0,0.18);
}

/* Tabs */
.info-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  background: var(--bg-app);
  border-radius: 10px;
  padding: 4px;
}
.info-tab {
  flex: 1;
  background: none;
  border: none;
  border-radius: 7px;
  padding: 9px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
}
.info-tab:hover { color: var(--text-main); }
.info-tab.active {
  background: var(--bg-card);
  color: var(--text-main);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.info-modal-close {
  position: absolute;
  top: 18px;
  right: 20px;
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  padding: 4px;
}
.info-modal-close:hover { color: var(--text-main); }

.info-modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 20px;
  letter-spacing: -0.3px;
}

.info-section {
  margin-bottom: 22px;
}
.info-section h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}
.info-section p {
  font-size: 0.925rem;
  line-height: 1.75;
  color: var(--text-muted);
}
.cost-row {
  font-size: 0.925rem;
}
.info-section em { color: var(--text-main); font-style: italic; }

.info-divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 28px 0;
}

/* Cost breakdown rows */
.cost-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}
.cost-label { color: var(--text-muted); }
.cost-value { font-weight: 700; color: var(--text-main); font-variant-numeric: tabular-nums; }
.cost-row-total .cost-label,
.cost-row-total .cost-value { color: var(--color-primary); }
.cost-note {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
  padding-top: 12px;
  font-style: italic;
}

.sidebar-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  font-weight: 700;
}

/* Card layout inside sidebar */
.control-card {
  background-color: var(--bg-card);
  border-radius: 12px;
  padding: 18px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Switch & Toggles CSS */
.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toggle-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.toggle-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
}

.toggle-description {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Custom switch element */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border-color);
  transition: .25s ease-in-out;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .25s ease-in-out;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

input:checked + .slider {
  background-color: var(--color-primary);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 6px;
  font-size: 0.9rem;
  transition: opacity 0.2s;
}

.legend-item:hover {
  background: #f1f5f9;
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  display: inline-block;
}

.legend-label {
  font-family: var(--font-sans);
  color: var(--text-main);
}

/* Tag filter legend & interactive toggles */
.tag-filters {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tag-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tag-badge.tag-independent {
  background-color: var(--color-amber-light);
  border-color: #F8E2C2;
  color: #B26500;
}

.tag-badge.tag-dependent {
  background-color: var(--color-primary-light);
  border-color: #F7DCD2;
  color: var(--color-primary);
}

.tag-badge.tag-control {
  background-color: var(--color-tan-light);
  border-color: #E2D9CE;
  color: var(--text-muted);
}

.tag-badge.tag-instrumental {
  background-color: var(--color-cool-teal-light);
  border-color: #C2E4E4;
  color: var(--color-cool-teal);
}

.tag-badge.tag-citation {
  background-color: var(--color-cool-indigo-light);
  border-color: #DDE2FF;
  color: var(--color-cool-indigo);
}

.tag-badge:hover {
  filter: brightness(0.96);
  transform: translateY(-1px);
}

.tag-badge.inactive {
  background-color: var(--bg-app) !important;
  border-color: var(--border-color) !important;
  color: var(--text-muted) !important;
  text-decoration: line-through;
  opacity: 0.6;
}

/* Inspector pane for detailed view */
.inspector-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.inspector-body {
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--text-muted);
}

.inspector-meta {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 6px;
  background-color: var(--bg-app);
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

/* API configuration pane */
.api-input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.api-input {
  width: 100%;
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
  background-color: var(--bg-app);
  color: var(--text-main);
  outline: none;
  font-family: monospace;
}

.api-input:focus {
  border-color: var(--border-focus);
}

.api-btn {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.api-btn:hover {
  background-color: var(--color-primary-hover);
}

/* MIDDLE CONTENT: Dashboard (Upload) & Reader View */
.main-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* Header bar */
.top-bar {
  height: 60px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background-color: var(--bg-card);
}

.back-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
  transition: all 0.2s;
}

.back-btn:hover {
  background-color: var(--bg-app);
  border-color: var(--text-muted);
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.app-state-indicator {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.auth-area {
  display: flex;
  align-items: center;
}

.sign-in-btn {
  background: #4285F4;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 7px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.sign-in-btn:hover { background: #3367d6; }

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.user-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sign-out-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 0.75rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
}
.sign-out-btn:hover { border-color: var(--text-muted); color: var(--text-main); }

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10B981;
  flex-shrink: 0;
}
.status-dot.offline {
  background-color: var(--color-amber);
}
.status-dot.loading {
  background-color: #60a5fa;
  animation: dotPulse 1.2s ease-in-out infinite;
}
@keyframes dotPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.4; transform: scale(0.7); }
}

/* SCREEN 1: Simple Dashboard (Upload or Paste Link) */
.dashboard-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  overflow-y: auto;
  background: radial-gradient(circle at 50% 50%, #FAF7F2 0%, #F5EDE0 100%);
}

.dashboard-center {
  max-width: 580px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 32px;
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.dashboard-headline h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -1px;
  margin-bottom: 12px;
}

.dashboard-headline p {
  font-size: 1rem;
  color: var(--text-muted);
}

/* Drag and Drop Zone */
.upload-zone {
  background-color: var(--bg-card);
  border: 2px dashed #D1C5B3;
  border-radius: 16px;
  padding: 48px 32px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.upload-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 1.5rem;
}

.upload-zone h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

.upload-zone p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Or Divider */
.divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.divider:not(:empty)::before {
  margin-right: 16px;
}

.divider:not(:empty)::after {
  margin-left: 16px;
}

/* Link entry */
.link-zone {
  display: flex;
  gap: 12px;
  background-color: var(--bg-card);
  padding: 8px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.link-input {
  flex: 1;
  border: none;
  background: none;
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--text-main);
  outline: none;
}

.link-input::placeholder {
  color: #A39688;
}

.link-btn {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.link-btn:hover {
  background-color: var(--color-primary-hover);
}

/* Try Sample Paper Section */
.samples-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.samples-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
  color: var(--text-muted);
}

.samples-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.sample-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 18px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
}

.sample-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateX(2px);
}

/* Swipe-to-delete paper cards */
.paper-row {
  position: relative;
  overflow: hidden;
  border-radius: 10px;
}

.paper-user-card {
  transition: transform 0.25s ease;
  user-select: none;
  cursor: grab;
}
.paper-user-card:active { cursor: grabbing; }
/* Override the sample-card hover shift — swipe interaction handles the feedback */
.paper-user-card:hover { transform: none; }

.paper-row.swiped .paper-user-card {
  transform: translateX(-72px);
}

.paper-delete-btn {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 70px;
  background: #ef4444;
  color: white;
  border: none;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transform: translateX(70px);
  transition: transform 0.25s ease;
  border-radius: 0 10px 10px 0;
}
.paper-row.swiped .paper-delete-btn {
  transform: translateX(0);
}
.paper-delete-btn:hover { background: #dc2626; }

.papers-empty {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 8px 0;
}

.demo-label {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: 4px;
}

.demo-card {
  border: 1.5px solid var(--color-primary-light);
}

.demo-banner {
  background: #c4a47c;
  color: #fff;
  text-align: center;
  padding: 10px 40px;
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  flex-shrink: 0;
  transition: background 0.4s;
}

.demo-banner-close {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
  cursor: pointer;
  line-height: 1;
  padding: 2px 4px;
}
.demo-banner-close:hover {
  color: #fff;
}

.sample-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}

.sample-info p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sample-arrow {
  color: var(--color-primary);
  font-weight: bold;
}

/* SCREEN 2: Reader Layout */
.reader-screen {
  flex: 1;
  overflow: hidden;
  background-color: var(--bg-card);
  display: none; /* Shown dynamically */
  flex-direction: column;
}

.reader-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 48px 80px;
}

.reader-container {
  max-width: 900px; /* Widened for PDF viewer */
  margin: 0 auto;
}

/* PDF Viewer & Highlights */
.pdf-page-container {
  position: relative;
  margin: 0 auto 32px auto;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  background: white;
  border-radius: 4px;
}

.pdf-canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.highlight-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.variable-highlight {
  position: absolute;
  border-radius: 3px;
  opacity: 0.45;
  cursor: pointer;
  pointer-events: auto;
  mix-blend-mode: multiply;
  transition: opacity 0.15s, outline 0.15s;
}

.variable-highlight:hover {
  opacity: 0.75;
  outline: 1.5px solid rgba(0,0,0,0.3);
  z-index: 10;
}

.variable-highlight.hidden {
  display: none !important;
}

/* Embedded PDF hyperlinks — transparent clickable overlay, cursor shows it's a link */
.pdf-hyperlink {
  position: absolute;
  cursor: pointer;
  z-index: 3;
}
.pdf-hyperlink:hover {
  background: rgba(59, 130, 246, 0.08);
  border-radius: 2px;
}

/* Citation highlights */
.citation-highlight {
  position: absolute;
  background: rgba(59, 130, 246, 0.12);
  border-bottom: 2px solid rgba(59, 130, 246, 0.55);
  cursor: pointer;
  border-radius: 2px;
  transition: background 0.15s;
  z-index: 10;
  pointer-events: auto;
}
.citation-highlight:hover {
  background: rgba(59, 130, 246, 0.25);
}

/* Citation tooltip — shares var-tooltip visual style, small overrides */
.citation-tooltip {
  max-width: 380px;
}
.citation-tooltip .citation-ref {
  font-style: normal;
  font-size: 0.85rem;
  color: rgb(59, 130, 246);
  font-family: var(--font-sans);
  font-weight: 600;
  margin-bottom: 4px;
}
.citation-tooltip .citation-desc {
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* Custom Tooltip */
.var-tooltip {
  position: absolute;
  background: white;
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  pointer-events: none;
  z-index: 100;
  font-family: var(--font-sans);
  min-width: 160px;
  max-width: 320px;
  transform: translate(-50%, -100%);
  margin-top: -8px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

.var-tooltip.visible {
  opacity: 1;
  pointer-events: auto;
}

/* When the edit box is open, float the tooltip in the centre of the screen
   so it stays accessible no matter where the cursor moves. */
.var-tooltip.visible.pinned {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 8px 40px rgba(0,0,0,0.2);
  z-index: 400;
}

.var-tooltip-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px;
}

.var-tooltip-symbol {
  font-family: 'Georgia', serif;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--text-main);
  font-style: italic;
  line-height: 1;
}

.var-tooltip-symbol.var-tooltip-edited::after {
  content: ' ✎';
  font-size: 0.6em;
  font-style: normal;
  color: var(--text-muted);
  vertical-align: super;
}

.var-tooltip-symbol sub {
  font-size: 0.65em;
  font-style: normal;
  font-weight: normal;
  color: var(--text-muted);
  vertical-align: sub;
}

.var-tooltip-edit-btn {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 2px 7px;
  line-height: 1.4;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 3px;
  font-family: var(--font-sans);
  transition: background 0.15s, color 0.15s;
}
.var-tooltip-edit-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.var-tooltip-edit-area {
  display: none;
  flex-direction: column;
  gap: 6px;
  margin-top: 6px;
}

.var-tooltip-textarea {
  width: 100%;
  font-size: 0.8rem;
  font-family: var(--font-sans);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 6px 8px;
  resize: vertical;
  min-height: 60px;
  box-sizing: border-box;
  outline: none;
  color: var(--text-main);
  background: var(--bg-app);
}
.var-tooltip-textarea:focus {
  border-color: var(--accent);
}

.var-tooltip-save-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.var-tooltip-save-btn {
  width: 100%;
  font-size: 0.82rem;
  padding: 7px 12px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 600;
  background: #c15f3c;
  color: #fff;
  letter-spacing: 0.01em;
}
.var-tooltip-save-btn:hover {
  background: #a84e2e;
}

.var-tooltip-cancel-btn {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--font-sans);
  padding: 2px;
  text-align: center;
}
.var-tooltip-cancel-btn:hover {
  color: var(--text-main);
}

.var-tooltip-desc {
  font-size: 0.82rem;
  color: var(--text-main);
  line-height: 1.45;
  margin-top: 2px;
}

.var-tooltip-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-style: italic;
  letter-spacing: 0.01em;
}

.var-tooltip-dismiss {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 8px;
  padding-top: 7px;
  border-top: 1px solid var(--border-color);
  font-size: 0.7rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.var-tooltip-dismiss input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--text-muted);
  width: 11px;
  height: 11px;
}

.paper-header {
  margin-bottom: 40px;
  border-bottom: 2px solid var(--bg-app);
  padding-bottom: 28px;
}

.paper-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 12px;
}

.paper-authors {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

.paper-abstract {
  background-color: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: 18px 24px;
  border-radius: 0 12px 12px 0;
  font-style: italic;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  line-height: 1.6;
  color: #4A3E3D;
  margin-bottom: 36px;
}

.paper-section {
  margin-bottom: 32px;
}

.section-heading {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.3px;
  font-family: var(--font-sans);
}

.section-body {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.75;
  color: #2D2722;
  text-align: justify;
  margin-bottom: 20px;
}

.section-body p {
  margin-bottom: 16px;
}

/* Bold all inline h3 headers from the basic parser */
.section-body h3,
.section-body .parsed-section-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-sans);
  margin-top: 28px;
  margin-bottom: 10px;
  letter-spacing: -0.2px;
}

.section-body h3 strong {
  font-weight: 800;
}

/* Orange italic subsection titles (e.g. "5.1. Static analysis") */
.section-body h4,
.section-body .parsed-subsection-title {
  font-size: 1.0rem;
  font-weight: 600;
  font-style: italic;
  color: var(--color-primary);
  font-family: var(--font-serif);
  margin-top: 20px;
  margin-bottom: 8px;
  letter-spacing: 0px;
}

/* Collapsed footnote blocks */
.footnote-block {
  margin: 20px 0 8px 0;
  border-left: 3px solid var(--border-color);
  padding-left: 12px;
}

.footnote-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 3px 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all 0.2s ease;
  letter-spacing: 0.3px;
}

.footnote-toggle:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.footnote-toggle.open {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.footnote-ellipsis {
  font-size: 1.1rem;
  letter-spacing: 2px;
  line-height: 1;
}

.footnote-content {
  display: none;
  margin: 10px 0 4px 0;
  padding: 10px 16px;
  background: var(--bg-app);
  border-radius: 8px;
  font-size: 0.82rem;
  font-family: var(--font-serif);
  color: var(--text-muted);
  line-height: 1.6;
  list-style: none;
}

.footnote-content.open {
  display: block;
}

.footnote-content li {
  padding: 3px 0;
  border-bottom: 1px solid var(--border-color);
}

.footnote-content li:last-child {
  border-bottom: none;
}

/* Block equations — centered KaTeX display math */
.equation {
  display: block;
  text-align: center;
  background-color: #FAF7F2;
  padding: 20px 36px;
  border-radius: 10px;
  margin: 28px auto;
  max-width: 92%;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--color-primary);
  overflow-x: auto;
}

/* KaTeX display mode block */
.equation.katex-block .katex-display {
  margin: 0;
}

.equation.katex-block .katex {
  font-size: 1.15rem;
}

/* Plain-text fallback equation */
.equation:not(.katex-block) {
  font-family: 'Georgia', var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-main);
  white-space: pre-wrap;
  letter-spacing: 0.3px;
  line-height: 2;
}

/* Inline KaTeX spans in paragraphs */
.section-body p .katex {
  font-size: 1em;
  vertical-align: baseline;
}

/* Fallback inline math code chip */
code.inline-eq {
  font-family: 'Georgia', serif;
  font-size: 0.97em;
  background-color: #F7F0E8;
  color: #7A3B1E;
  padding: 0px 3px;
  border-radius: 3px;
  font-style: italic;
  letter-spacing: 0.2px;
}

/* TOKENS FOR HIGHLIGHTING */

/* Math Variable Token */
.variable-token {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 600;
  cursor: help;
  padding: 0 4px;
  border-radius: 4px;
  transition: all 0.2s ease-in-out;
  border-bottom: 2px solid transparent;
}

/* Highlight Variable Types */
.variable-token[data-tag="independent"] {
  border-color: #F59E0B; /* Amber border */
}
body:not(.hide-variables) .variable-token[data-tag="independent"] {
  background-color: var(--color-amber-light);
}

.variable-token[data-tag="dependent"] {
  border-color: var(--color-primary); /* Terracotta border */
}
body:not(.hide-variables) .variable-token[data-tag="dependent"] {
  background-color: var(--color-primary-light);
}

.variable-token[data-tag="control"] {
  border-color: var(--color-tan); /* Tan border */
}
body:not(.hide-variables) .variable-token[data-tag="control"] {
  background-color: var(--color-tan-light);
}

/* Cool Accent 1: Instrumental Variable */
.variable-token[data-tag="instrumental"] {
  border-color: var(--color-cool-teal); /* Teal border */
}
body:not(.hide-variables) .variable-token[data-tag="instrumental"] {
  background-color: var(--color-cool-teal-light);
}

/* CITATIONS */
/* Cool Accent 2: Citation */
.citation-token {
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.2s ease-in-out;
  color: var(--color-cool-indigo);
  border: 1px solid transparent;
}
body:not(.hide-citations) .citation-token {
  background-color: var(--color-cool-indigo-light);
  border-color: #DDE2FF;
}

/* HOVER STATES */
.variable-token:hover, .citation-token:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  filter: brightness(0.95);
}

/* GLOBAL DISABLE SWITCHES */
body.hide-variables .variable-token {
  background-color: transparent !important;
  border-bottom: 2px solid transparent !important;
  cursor: text !important;
}
body.hide-variables .variable-highlight {
  display: none !important;
}

body.hide-citations .citation-token {
  background-color: transparent !important;
  border: 1px solid transparent !important;
  color: inherit !important;
  cursor: text !important;
}
body.hide-citations .citation-highlight {
  display: none !important;
}

body.hide-definitions #dictionary-section {
  display: none;
}

/* Temporary word definition highlight */
.word-definition-highlight {
  background-color: #FEF3C7; /* Soft yellow highlight */
  border-bottom: 2px dashed #D97706;
}

/* FLOATING TOOLTIP FOR TOKENS */
.custom-tooltip {
  position: absolute;
  z-index: 100;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  border-radius: 8px;
  padding: 12px 16px;
  max-width: 280px;
  font-size: 0.8rem;
  line-height: 1.4;
  pointer-events: none;
  animation: tooltipFade 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tooltip-header {
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tooltip-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 4px;
}

.tooltip-tag.tag-independent {
  background-color: var(--color-amber-light);
  color: #B26500;
}
.tooltip-tag.tag-dependent {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}
.tooltip-tag.tag-control {
  background-color: var(--color-tan-light);
  color: var(--text-muted);
}
.tooltip-tag.tag-instrumental {
  background-color: var(--color-cool-teal-light);
  color: var(--color-cool-teal);
}
.tooltip-tag.tag-citation {
  background-color: var(--color-cool-indigo-light);
  color: var(--color-cool-indigo);
}

.tooltip-body {
  color: var(--text-muted);
}

/* LOADING OVERLAY SCREEN */
.loading-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(250, 247, 242, 0.9);
  display: none; /* Shown dynamically */
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  gap: 20px;
}

.loader {
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  animation: spin 1s linear infinite;
}

/* KEYFRAMES & ANIMATIONS */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

@keyframes tooltipFade {
  from { opacity: 0; transform: translateY(4px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}