/* Premium Design Tokens & Reset System */
:root {
  --bg-main: #080b16;
  --bg-surface: rgba(17, 24, 39, 0.45);
  --bg-surface-hover: rgba(28, 37, 60, 0.65);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(99, 102, 241, 0.45);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  
  --accent-teal: #38bdf8;
  --accent-purple: #6366f1;
  --accent-pink: #a855f7;
  
  --glow-teal: rgba(56, 189, 248, 0.08);
  --glow-purple: rgba(99, 102, 241, 0.08);
  
  --font-heading: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-body);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Decorative Cosmic Glow Assets */
.app-container {
  position: relative;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 24px;
  z-index: 2;
}

.bg-glow {
  position: fixed;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  filter: blur(180px);
  pointer-events: none;
  z-index: 1;
  opacity: 0.15;
}

.glow-primary {
  background: var(--accent-purple);
  top: -20%;
  right: -10%;
}

.glow-secondary {
  background: var(--accent-teal);
  bottom: -20%;
  left: -10%;
}

/* Top Hero Segment */
.app-header {
  text-align: center;
  margin-bottom: 24px;
  padding-top: 10px;
}

.title-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 10px;
}

.back-link {
  position: absolute;
  left: 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-smooth);
}
.back-link:hover {
  color: var(--text-primary);
}

.app-header h1 {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 40%, #94a3b8 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0;
}

.subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  font-weight: 300;
}

/* Master UI View Toggle */
.master-view-toggle {
  display: flex;
  max-width: fit-content;
  margin: 0 auto 24px auto;
  background: rgba(10, 15, 40, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 6px;
  gap: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.master-tab-btn {
  flex: 0 1 auto;
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 10px 24px;
  border-radius: 12px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-smooth);
}

.master-tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.master-tab-btn.active {
  background: var(--accent-purple);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

/* Master-Detail Split Layout */
.split-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 32px;
  align-items: start;
  margin-bottom: 24px;
}

/* Left Sidebar Pane */
.sidebar-pane {
  background: rgba(10, 15, 40, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
}

/* Premium Search Input Wrapper */
.search-wrapper {
  position: relative;
  width: 100%;
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  pointer-events: none;
  transition: var(--transition-smooth);
}

#search-input-split,
#search-input-grid,
#search-input-mindmap {
  width: 100%;
  background: rgba(5, 8, 24, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 16px 20px 16px 56px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-body);
  transition: var(--transition-smooth);
}

#search-input-split:focus,
#search-input-grid:focus,
#search-input-mindmap:focus {
  outline: none;
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.15);
  background: rgba(5, 8, 24, 0.8);
}

#search-input-split:focus + .search-icon,
#search-input-grid:focus + .search-icon,
#search-input-mindmap:focus + .search-icon {
  color: var(--accent-teal);
}

.clear-btn {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  padding: 0 5px;
}

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

/* Action Button Styles */
.tab-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 10px 16px;
  border-radius: 10px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  background: var(--accent-purple);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

/* Sidebar Meta Info */
.sidebar-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 4px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 12px;
}

.reset-btn {
  background: none;
  border: none;
  color: var(--accent-pink);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
}

.reset-btn:hover {
  text-decoration: underline;
}

/* Dynamic Navigation Content Container */
.sidebar-content {
  overflow-y: auto;
  flex-grow: 1;
  padding-right: 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Custom Scrollbar for Sidebar */
.sidebar-content::-webkit-scrollbar {
  width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
  background: rgba(5, 8, 24, 0.3);
  border-radius: 10px;
}

.sidebar-content::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Tree Hierarchy & A-Z List Styles */
.tree-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 8px;
}

.tree-group-title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 2px 8px;
  font-weight: 700;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.02);
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.1);
}

.nav-item.active {
  background: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  font-weight: 600;
  border-left: 4px solid var(--accent-purple);
}

.tree-child {
  margin-left: 20px;
  position: relative;
}

.tree-child::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  width: 8px;
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
}

.tree-child::after {
  content: '';
  position: absolute;
  left: -12px;
  top: -10px;
  height: calc(50% + 10px);
  width: 1px;
  background: rgba(255, 255, 255, 0.15);
}

/* A-Z Index Styles */
.alpha-group {
  margin-bottom: 16px;
}

.alpha-header {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-purple);
  border-bottom: 1px solid rgba(155, 93, 229, 0.3);
  padding-bottom: 4px;
  margin-bottom: 8px;
  padding-left: 8px;
}

/* Control Center Floating Hub (Grid View) */
.control-hub {
  background: rgba(10, 15, 40, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Alphabet Slider Index Navigation */
.alphabet-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.alpha-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9rem;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.alpha-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.1);
}

.alpha-btn.active {
  background: var(--accent-purple);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.alpha-btn.disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

.alpha-btn[data-letter="ALL"] {
  width: 56px;
}

/* Meta Status Counters Bar */
.meta-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 8px;
  margin-bottom: 24px;
}

.result-count {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.filter-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 4px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Dynamic Glassmorphic Cards Layout Deck */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 16px;
}

.taxonomy-card {
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.taxonomy-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  transition: var(--transition-smooth);
}

.taxonomy-card:hover {
  transform: translateY(-4px);
  background: var(--bg-surface-hover);
  border-color: var(--border-hover);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35), 0 0 20px rgba(99, 102, 241, 0.08);
}

.taxonomy-card:hover::before {
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-purple));
}

/* Visual Mindmap Explorer Styles */
.mindmap-canvas {
  display: flex;
  align-items: center;
  padding: 40px;
  overflow: auto;
  min-height: 650px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.5);
  position: relative;
}

.mindmap-root {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  color: #ffffff;
  padding: 16px 32px;
  border-radius: 20px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.3rem;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.25);
  z-index: 2;
  flex-shrink: 0;
}

.mindmap-branches {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-left: 48px;
  position: relative;
}

.mindmap-branches::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 48px;
  height: 2px;
  background: var(--accent-purple);
}

.mindmap-branch {
  display: flex;
  align-items: center;
  position: relative;
}

.mindmap-subbranches {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 40px;
  position: relative;
}

.mindmap-subbranches::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: rgba(255, 255, 255, 0.15);
}

.mindmap-node {
  background: rgba(10, 15, 40, 0.8);
  border: 1px solid var(--border-color);
  padding: 12px 24px;
  border-radius: 16px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  position: relative;
  flex-shrink: 0;
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  gap: 12px;
}

.mindmap-node::before {
  content: '';
  position: absolute;
  left: -40px;
  top: 50%;
  width: 40px;
  height: 2px;
  background: rgba(255, 255, 255, 0.15);
}

.mindmap-node:hover {
  border-color: var(--accent-teal);
  box-shadow: 0 0 15px var(--glow-teal);
  transform: translateY(-2px);
}

.category-node {
  border-left: 4px solid var(--accent-teal);
  font-family: var(--font-heading);
  font-size: 1.1rem;
}

.concept-node {
  border-left: 4px solid var(--accent-purple);
}

.child-concept-node {
  border-left: 4px solid var(--accent-pink);
  font-size: 0.88rem;
}

/* Native Dialog Modal Styling */
.concept-modal {
  margin: auto;
  background: var(--bg-surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-color);
  border-radius: 28px;
  padding: 40px;
  max-width: 800px;
  width: 90%;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 1px var(--accent-teal);
  color: var(--text-primary);
  font-family: var(--font-body);
}

.concept-modal::backdrop {
  background: rgba(6, 9, 25, 0.8);
  backdrop-filter: blur(10px);
}

.modal-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: -20px;
  position: relative;
  z-index: 10;
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.modal-close-btn:hover {
  background: rgba(241, 91, 181, 0.2);
  color: var(--accent-pink);
  border-color: var(--accent-pink);
}

/* Right Content Area: Detail Sheet */
.content-pane {
  display: flex;
  flex-direction: column;
}

.breadcrumb-trail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: rgba(10, 15, 40, 0.5);
  border: 1px solid var(--border-color);
  padding: 10px 18px;
  border-radius: 14px;
  backdrop-filter: blur(10px);
}

.breadcrumb-item {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.breadcrumb-item:hover {
  color: var(--accent-teal);
}

.breadcrumb-sep {
  color: var(--text-muted);
}

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

/* Main Concept Detail Card */
.concept-detail-card {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 1px var(--accent-teal);
  position: relative;
  overflow: hidden;
  animation: fadeIn 0.4s ease-out;
}

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

.concept-detail-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-purple));
}

/* Card Elements Content Style */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.category-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

/* CURATED COLOR ACCENTS PER CATEGORY DELIVERABLE */
.tag-threats { background: rgba(239, 68, 68, 0.08); border: 1px solid rgba(239, 68, 68, 0.2); color: #f87171; }
.tag-controls { background: rgba(16, 185, 129, 0.08); border: 1px solid rgba(16, 185, 129, 0.2); color: #34d399; }
.tag-privacy { background: rgba(99, 102, 241, 0.08); border: 1px solid rgba(99, 102, 241, 0.2); color: #818cf8; }
.tag-identity { background: rgba(14, 165, 233, 0.08); border: 1px solid rgba(14, 165, 233, 0.2); color: #38bdf8; }
.tag-practices { background: rgba(245, 158, 11, 0.08); border: 1px solid rgba(245, 158, 11, 0.2); color: #fbbf24; }
.tag-infra { background: rgba(168, 85, 247, 0.08); border: 1px solid rgba(168, 85, 247, 0.2); color: #c084fc; }
.tag-default { background: rgba(255, 255, 255, 0.04); border: 1px solid rgba(255, 255, 255, 0.08); color: var(--text-secondary); }

.card-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 400;
  flex-grow: 1;
}

.card-notes {
  background: rgba(5, 8, 24, 0.3);
  border-left: 2px solid var(--accent-purple);
  padding: 10px 12px;
  border-radius: 0 8px 8px 0;
  font-size: 0.88rem;
  color: #8d95be;
}

.card-notes strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* Related Cross-WGs Badges List */
.card-workgroups {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.wg-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.wg-badge {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 500;
}

.taxonomy-card:hover .wg-badge {
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.07);
}

/* Aliases & Broader Concept Styles */
.card-aliases {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-top: -4px;
}

.alias-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.alias-badge {
  background: rgba(155, 93, 229, 0.15);
  border: 1px solid rgba(155, 93, 229, 0.3);
  color: #dfbaff;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 6px;
  font-weight: 500;
}

.card-broader {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 245, 212, 0.05);
  border: 1px solid rgba(0, 245, 212, 0.15);
  padding: 6px 12px;
  border-radius: 8px;
}

.broader-label {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.78rem;
}

.broader-link {
  color: var(--accent-teal);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.broader-link:hover {
  text-decoration: underline;
  text-shadow: 0 0 8px var(--glow-teal);
}

/* Interactive Pulse Animation for Scroll Target */
@keyframes cardPulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 245, 212, 0.6); border-color: var(--accent-teal); }
  70% { box-shadow: 0 0 0 20px rgba(0, 245, 212, 0); border-color: var(--accent-teal); }
  100% { box-shadow: 0 0 0 0 rgba(0, 245, 212, 0); border-color: var(--border-color); }
}

.card-pulse {
  animation: cardPulse 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Real-Time Text Query Highlight Match Style */
mark.match-highlight {
  background: rgba(0, 245, 212, 0.25);
  color: var(--accent-teal);
  border-bottom: 1px solid var(--accent-teal);
  padding: 0 2px;
  border-radius: 2px;
}

/* Empty State Container */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-surface);
  border: 1px dashed var(--border-color);
  border-radius: 20px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.empty-state span {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Footer Style */
.app-footer {
  text-align: center;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Responsive Adaptation Queries */
@media (max-width: 992px) {
  .app-header h1 { font-size: 2.2rem; }
  .split-layout { grid-template-columns: 1fr; }
  .sidebar-pane { position: relative; top: 0; max-height: 500px; }
  .app-container { padding: 20px 16px; }
}

/* Style Toggle Button */
.style-toggle-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: 12px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 8px;
}
.style-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--border-hover);
  box-shadow: 0 0 15px var(--glow-purple);
}

.title-wrapper .style-toggle-btn {
  position: absolute;
  right: 0;
}

/* ==================== LIGHT MODE OVERRIDES ==================== */
body.light-mode {
  --bg-main: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-surface-hover: rgba(255, 255, 255, 0.95);
  --border-color: #e2e8f0;
  --border-hover: rgba(99, 102, 241, 0.45);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent-teal: #0284c7;
  --accent-purple: #4f46e5;
  --accent-pink: #9333ea;
  
  --glow-teal: rgba(14, 165, 233, 0.1);
  --glow-purple: rgba(99, 102, 241, 0.1);

  background-color: #f8fafc;
  color: #0f172a;
}

body.light-mode .bg-glow {
  display: none;
}

body.light-mode .app-header h1 {
  background: none;
  color: #0f172a;
  -webkit-text-fill-color: #0f172a;
}

body.light-mode .back-link {
  color: #64748b;
}
body.light-mode .back-link:hover {
  color: #0f172a;
}

body.light-mode .master-view-toggle {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
body.light-mode .master-tab-btn:hover {
  background: #f1f5f9;
}
body.light-mode .master-tab-btn.active {
  background: #4f46e5;
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

body.light-mode #search-input-split,
body.light-mode #search-input-grid,
body.light-mode #search-input-mindmap {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}
body.light-mode #search-input-split:focus,
body.light-mode #search-input-grid:focus,
body.light-mode #search-input-mindmap:focus {
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  background: #ffffff;
}

body.light-mode .sidebar-pane {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
body.light-mode .nav-item {
  background: #f8fafc;
}
body.light-mode .nav-item:hover {
  background: #f1f5f9;
  color: #0f172a;
}
body.light-mode .nav-item.active {
  background: rgba(79, 70, 229, 0.08);
  border-color: rgba(79, 70, 229, 0.3);
  color: #4f46e5;
}
body.light-mode .tree-child::before,
body.light-mode .tree-child::after {
  background: #cbd5e1;
}

body.light-mode .control-hub {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
body.light-mode .alpha-btn {
  color: #475569;
}
body.light-mode .alpha-btn:hover {
  background: #f1f5f9;
  color: #0f172a;
}
body.light-mode .alpha-btn.active {
  background: #4f46e5;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

body.light-mode .tab-btn:hover {
  background: #f1f5f9;
}
body.light-mode .tab-btn.active {
  background: #4f46e5;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
}

body.light-mode .mindmap-canvas {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.02);
}
body.light-mode .mindmap-node {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}
body.light-mode .mindmap-node:hover {
  border-color: #4f46e5;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
}
body.light-mode .mindmap-subbranches::before {
  background: #cbd5e1;
}
body.light-mode .mindmap-node::before {
  background: #cbd5e1;
}
body.light-mode .mindmap-branches::before {
  background: #4f46e5;
}

body.light-mode .concept-modal {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}
body.light-mode .concept-modal::backdrop {
  background: rgba(15, 23, 42, 0.4);
}
body.light-mode .modal-close-btn {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #64748b;
}
body.light-mode .modal-close-btn:hover {
  background: #fee2e2;
  color: #ef4444;
  border-color: #ef4444;
}

body.light-mode .breadcrumb-trail {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #64748b;
}
body.light-mode .breadcrumb-item {
  color: #475569;
}
body.light-mode .breadcrumb-item:hover {
  color: #4f46e5;
}

body.light-mode .concept-detail-card {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}
body.light-mode .card-notes {
  background: #f8fafc;
  border-left-color: #4f46e5;
  color: #475569;
}
body.light-mode .card-notes strong {
  color: #0f172a;
}

body.light-mode .style-toggle-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}
body.light-mode .style-toggle-btn:hover {
  background: #f1f5f9;
  border-color: #64748b;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

body.light-mode .tag-threats { background: #fee2e2; border: 1px solid #fecaca; color: #b91c1c; }
body.light-mode .tag-controls { background: #d1fae5; border: 1px solid #a7f3d0; color: #047857; }
body.light-mode .tag-privacy { background: #e0e7ff; border: 1px solid #c7d2fe; color: #4338ca; }
body.light-mode .tag-identity { background: #e0f2fe; border: 1px solid #bae6fd; color: #0369a1; }
body.light-mode .tag-practices { background: #fef3c7; border: 1px solid #fde68a; color: #b45309; }
body.light-mode .tag-infra { background: #f3e8ff; border: 1px solid #e9d5ff; color: #6b21a8; }
body.light-mode .tag-default { background: #f1f5f9; border: 1px solid #e2e8f0; color: #475569; }