:root {
  --bg-dark: #070b14;
  --bg-panel: rgba(11, 17, 30, 0.88);
  --bg-panel-solid: #0b111e;
  --bg-card: rgba(20, 30, 52, 0.72);
  --bg-card-hover: rgba(30, 45, 78, 0.85);
  --border-subtle: rgba(100, 145, 220, 0.18);
  --border-bright: rgba(56, 189, 248, 0.55);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-purple: #a855f7;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Monaco, Consolas, monospace;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================================
   LAYOUT GRID
   ============================================================================ */
.app-shell {
  display: grid;
  grid-template-rows: 58px 1fr;
  grid-template-columns: 320px 1fr 370px;
  width: 100vw;
  height: 100vh;
  position: relative;
}

/* ============================================================================
   TOP HEADER BAR
   ============================================================================ */
.top-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: linear-gradient(90deg, rgba(8, 13, 25, 0.96), rgba(14, 23, 42, 0.96));
  border-bottom: 1px solid var(--border-subtle);
  z-index: 30;
  gap: 12px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  white-space: nowrap;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: radial-gradient(circle at 30% 30%, #38bdf8, #2563eb 60%, #0f172a);
  border: 1px solid rgba(56, 189, 248, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.35);
  font-weight: 800;
  font-size: 14px;
  color: #fff;
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

.brand-title {
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}

.brand-badge {
  font-size: 9.5px;
  font-family: var(--font-mono);
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.35);
  white-space: nowrap;
}

.brand-subtitle {
  font-size: 10.5px;
  color: var(--text-muted);
  white-space: nowrap;
  margin-top: 2px;
}

.brand-subtitle a {
  color: var(--accent-cyan);
  text-decoration: none;
}

.brand-subtitle a:hover {
  text-decoration: underline;
}

/* Scale Bookmark Bar in Header */
.scale-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(15, 23, 42, 0.8);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  flex-shrink: 1;
  overflow-x: auto;
}

.scale-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: left;
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  white-space: nowrap;
}

.scale-btn:hover {
  background: rgba(56, 189, 248, 0.1);
  color: #fff;
}

.scale-btn.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.22), rgba(59, 130, 246, 0.18));
  border-color: var(--border-bright);
  color: #fff;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.scale-btn .scale-lvl {
  font-size: 9px;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-weight: 600;
}

.scale-btn .scale-lbl {
  font-size: 10.5px;
  font-weight: 600;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 7px;
  flex-shrink: 0;
}

.preset-select {
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  max-width: 195px;
}

.preset-select:focus {
  border-color: var(--accent-cyan);
}

.action-btn {
  background: rgba(30, 41, 59, 0.85);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 6px 11px;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.16s ease;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  white-space: nowrap;
}

.action-btn:hover {
  background: rgba(56, 189, 248, 0.18);
  border-color: var(--accent-cyan);
  color: #fff;
}

.action-btn.primary {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.22), rgba(6, 182, 212, 0.22));
  border-color: rgba(16, 185, 129, 0.5);
  color: #a7f3d0;
}

.action-btn.primary:hover {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.35), rgba(6, 182, 212, 0.35));
  color: #fff;
}

/* ============================================================================
   LEFT SIDEBAR: COMPONENT EXPLORER & CONTROLS
   ============================================================================ */
.left-panel {
  background: var(--bg-panel);
  backdrop-filter: blur(14px);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 20;
}

.panel-section-header {
  padding: 11px 14px 8px;
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(100, 145, 220, 0.12);
}

.search-box-wrap {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(100, 145, 220, 0.12);
}

.search-input {
  width: 100%;
  background: rgba(7, 11, 20, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 6px 10px;
  color: var(--text-main);
  font-size: 12px;
  outline: none;
}

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

.component-tree {
  flex: 1;
  overflow-y: auto;
  padding: 8px 10px;
}

.tree-category {
  margin-bottom: 10px;
}

.tree-category-title {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--text-muted);
  padding: 4px 6px;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tree-item {
  width: 100%;
  text-align: left;
  background: rgba(18, 28, 48, 0.55);
  border: 1px solid rgba(100, 145, 220, 0.12);
  border-radius: 6px;
  padding: 7px 9px;
  margin-bottom: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tree-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.35);
}

.tree-item.selected {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.22), rgba(30, 58, 138, 0.35));
  border-color: var(--accent-cyan);
  box-shadow: inset 3px 0 0 var(--accent-cyan);
}

.tree-item-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.25;
}

.tree-item-scale {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* CAD & Layer Controls Block */
.cad-controls {
  border-top: 1px solid var(--border-subtle);
  padding: 10px 12px;
  background: rgba(8, 13, 25, 0.9);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--text-main);
}

.slider-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.slider-wrap input[type="range"] {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.layer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}

.layer-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10.5px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  padding: 3px 5px;
  border-radius: 4px;
  background: rgba(20, 30, 52, 0.5);
  border: 1px solid rgba(100, 145, 220, 0.12);
}

.layer-toggle input {
  accent-color: var(--accent-cyan);
}

.layer-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

/* ============================================================================
   CENTER 3D VIEWPORT & OVERLAYS
   ============================================================================ */
.viewport-area {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: radial-gradient(circle at 50% 45%, #0f172a 0%, #050811 85%);
}

#canvas-container {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  cursor: grab;
}

#canvas-container:active {
  cursor: grabbing;
}

/* Top-Left Telemetry HUD inside Viewport */
.viewport-hud-top {
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  pointer-events: none;
  z-index: 15;
}

.hud-card {
  background: rgba(8, 13, 25, 0.84);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 8px 12px;
  pointer-events: auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
}

.hud-scale-readout {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hud-scale-value {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.hud-scale-desc {
  font-size: 11px;
  color: var(--text-muted);
}

.hud-quick-actions {
  display: flex;
  gap: 6px;
}

/* 3D HTML Floating Labels */
#labels-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 10;
}

.label-3d {
  position: absolute;
  transform: translate(-50%, -100%);
  background: rgba(9, 15, 28, 0.88);
  border: 1px solid rgba(56, 189, 248, 0.45);
  color: #e2e8f0;
  padding: 3px 8px;
  border-radius: 5px;
  font-size: 10.5px;
  font-weight: 600;
  white-space: nowrap;
  pointer-events: auto;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  gap: 5px;
}

.label-3d:hover {
  background: rgba(30, 58, 138, 0.95);
  border-color: #fff;
  color: #fff;
  z-index: 25;
}

.label-3d.zone-label {
  border-color: rgba(245, 158, 11, 0.65);
  background: rgba(20, 14, 5, 0.9);
  color: #fde68a;
}

.label-3d .lbl-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.label-3d.zone-label .lbl-dot {
  background: var(--accent-amber);
}

/* Bottom Quantum Execution Cycle Simulator Bar */
.cycle-bar {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  background: rgba(8, 13, 25, 0.9);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 9px 13px;
  z-index: 15;
  display: flex;
  flex-direction: column;
  gap: 7px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
}

.cycle-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.cycle-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cycle-play-btn {
  background: var(--accent-cyan);
  color: #050811;
  border: none;
  border-radius: 5px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}

.cycle-play-btn:hover {
  filter: brightness(1.1);
}

.cycle-stage-name {
  font-size: 12px;
  font-weight: 700;
  color: #fff;
}

.cycle-stage-time {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.14);
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.cycle-steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.cycle-step-btn {
  background: rgba(20, 30, 52, 0.7);
  border: 1px solid rgba(100, 145, 220, 0.18);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 5px 8px;
  font-size: 10.5px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cycle-step-btn:hover {
  border-color: var(--accent-cyan);
  color: #fff;
}

.cycle-step-btn.active {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.25), rgba(16, 185, 129, 0.2));
  border-color: var(--accent-cyan);
  color: #fff;
}

.cycle-desc-row {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.35;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.cycle-citation {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent-amber);
  white-space: nowrap;
}

/* ============================================================================
   RIGHT SIDEBAR: ENGINEERING INSPECTOR & DATASHEET
   ============================================================================ */
.right-panel {
  background: var(--bg-panel);
  backdrop-filter: blur(14px);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 20;
  padding: 14px;
  gap: 12px;
}

.inspector-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.inspector-cat-badge {
  display: inline-flex;
  align-self: flex-start;
  font-size: 10px;
  font-family: var(--font-mono);
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.14);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.inspector-title {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
}

.inspector-scale {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--accent-amber);
}

.inspector-btn-row {
  display: flex;
  gap: 7px;
  margin-top: 4px;
}

.inspector-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.card-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  color: var(--accent-cyan);
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table tr {
  border-bottom: 1px solid rgba(100, 145, 220, 0.1);
}

.specs-table tr:last-child {
  border-bottom: none;
}

.specs-table td {
  padding: 5px 0;
  font-size: 11.5px;
  vertical-align: top;
}

.specs-table td:first-child {
  color: var(--text-muted);
  width: 42%;
  padding-right: 8px;
}

.specs-table td:last-child {
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
}

.role-text {
  font-size: 12px;
  line-height: 1.5;
  color: #cbd5e1;
}

.equation-box {
  background: rgba(5, 8, 17, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 6px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #bae6fd;
  overflow-x: auto;
  white-space: nowrap;
}

.papers-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.papers-list li {
  font-size: 11px;
  line-height: 1.4;
  color: #e2e8f0;
  padding-left: 10px;
  border-left: 2px solid var(--accent-amber);
}

/* ============================================================================
   MODAL: 2023-2026 LITERATURE & ARCHITECTURE MATRIX
   ============================================================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 6, 14, 0.82);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-window {
  width: min(1060px, 95vw);
  max-height: 88vh;
  background: #0b1120;
  border: 1px solid var(--border-bright);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.modal-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(15, 23, 42, 0.9);
}

.modal-body {
  padding: 18px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.metrics-banner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.metric-tile {
  background: rgba(20, 30, 52, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 10px 12px;
}

.metric-tile .m-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.metric-tile .m-lbl {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.papers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.paper-card {
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 11px 13px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.paper-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--accent-amber);
}

.paper-card-title {
  font-size: 12.5px;
  font-weight: 700;
  color: #fff;
}

.paper-card-desc {
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.4;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 3px;
}

.paper-tag {
  font-size: 9.5px;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(7, 11, 20, 0.4);
}
::-webkit-scrollbar-thumb {
  background: rgba(100, 145, 220, 0.3);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(56, 189, 248, 0.6);
}