:root, :root[data-theme="dark"] {
  --bg: #0b0e13;
  --panel: #11151c;
  --panel-2: #161b24;
  --border: #232b38;
  --border-soft: #1a2029;
  --text: #d7dee8;
  --text-dim: #7d8ba0;
  --text-faint: #4d5a6c;
  --text-muted: var(--text-faint);
  --accent: #5fd9c4;
  --accent-dim: #2c5a52;
  --accent-soft: rgba(95, 217, 196, 0.14);
  --highlight: #ff2fb0;
  --highlight-dim: #5c1846;
  --warn: #e6a23c;
  --danger: #e35d5d;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --sans: 'Inter', -apple-system, sans-serif;

  --c-substrate: #3a3f4b;
  --c-well: #3f8f6f;
  --c-active-p: #cf8a4a;
  --c-active-n: #4a92c9;
  --c-sde-p: #f0b47a;
  --c-sde-n: #8fd0f8;
  --c-oxide: #dff0f7;
  --c-highk: #a855f7;
  --c-poly: #d8503c;
  --c-contact: #e8e2d5;
  --c-metal: #4f86c9;
  --c-vdd: #e35d5d;
  --c-gnd: #6b7686;
  --c-in: #e6c94a;
  --c-out: #57cf8f;

  --gold: #ffcf4d;
  --cyan: #4fd1ff;
  --green: #2fbf7a;
  --red: #e35d5d;
  --amber: #e6a23c;
  --glass: var(--panel);
  --shadow: 0 0 28px rgba(0, 0, 0, .5);
  --font-sans: var(--sans);
  --font-mono: var(--mono);
  --topbar-h: 52px;
  --footer-h: 28px;
  --drawer-w: 262px;
}

:root[data-theme="light"] {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --panel-2: #f1f5f9;
  --border: #cbd5e1;
  --border-soft: #e2e8f0;
  --text: #0f172a;
  --text-dim: #334155;
  --text-faint: #64748b;
  --text-muted: var(--text-faint);
  --accent: #0d9488;
  --accent-dim: #ccfbf1;
  --accent-soft: #ccfbf1;
  --highlight: #db2777;
  --highlight-dim: #fce7f3;
  --warn: #d97706;
  --danger: #dc2626;

  --c-substrate: #475569;
  --c-well: #059669;
  --c-active-p: #d97706;
  --c-active-n: #0284c7;
  --c-sde-p: #f59e0b;
  --c-sde-n: #38bdf8;
  --c-oxide: #0284c7;
  --c-highk: #7c3aed;
  --c-poly: #dc2626;
  --c-contact: #334155;
  --c-metal: #2563eb;
  --c-vdd: #dc2626;
  --c-gnd: #475569;
  --c-in: #d97706;
  --c-out: #16a34a;

  --gold: #d97706;
  --cyan: #0284c7;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
  --glass: var(--panel);
  --shadow: 0 0 24px rgba(15, 23, 42, 0.10);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 12px;
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

/* Loading Overlay */
#loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.25s ease;
}

#loading-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loader-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 26px 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  text-align: center;
}

.loader-ring {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  animation: spin 0.85s linear infinite;
}

.loader-title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.08em;
}

.loader-sub {
  color: var(--text-dim);
  font-size: 11px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Topbar */
#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  z-index: 50;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0 10px;
  overflow-x: auto;
  scrollbar-width: none;
  user-select: none;
}

#topbar::-webkit-scrollbar {
  display: none;
}

.tb-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
}

.brand-badge {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  padding: 4px 7px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(95, 217, 196, 0.32);
  letter-spacing: 0.05em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title {
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: 0.01em;
}

.brand-eq {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
}

.tb-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.tb-group {
  display: flex;
  align-items: center;
  gap: 5px;
}

.tb-label {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  color: var(--text-dim);
}

.seg-ctrl {
  display: inline-flex;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 2px;
  gap: 2px;
}

.seg-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

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

.seg-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.seg-btn.flow-current.active {
  background: rgba(255, 207, 77, 0.16);
  color: var(--gold);
}

.seg-btn.flow-electron.active {
  background: rgba(79, 209, 255, 0.16);
  color: var(--cyan);
}

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

.tb-btn {
  appearance: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 7px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  white-space: nowrap;
}

.tb-btn:hover {
  border-color: var(--accent);
}

/* Shimmering Tour Button */
.tour-btn {
  position: relative;
  padding: 1px;
  border: none;
  background: linear-gradient(110deg, #38bdf8, #5fd9c4, #a855f7, #5fd9c4);
  background-size: 240% 240%;
  border-radius: 8px;
  animation: tourBtnGlow 3.2s ease-in-out infinite;
  overflow: hidden;
}

.tour-btn-inner {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  border-radius: 7px;
  background: var(--panel);
  color: var(--accent);
  overflow: hidden;
}

.tour-btn-inner::after {
  content: '';
  position: absolute;
  top: 0;
  left: -110%;
  width: 65%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(95, 217, 196, 0.25), transparent);
  animation: tourBtnShimmer 2.8s ease-in-out infinite;
}

@keyframes tourBtnGlow {
  0%, 100% {
    background-position: 0% 50%;
    box-shadow: 0 0 12px rgba(95, 217, 196, 0.28);
  }
  50% {
    background-position: 100% 50%;
    box-shadow: 0 0 18px rgba(79, 209, 255, 0.45);
  }
}

@keyframes tourBtnShimmer {
  0% { left: -110%; }
  55%, 100% { left: 140%; }
}

/* Main Workspace */
#workspace {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  right: 0;
  bottom: var(--footer-h);
  overflow: hidden;
}

#canvas-wrap {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 40%, #10151d 0%, #0a0d12 75%);
}

:root[data-theme="light"] #canvas-wrap {
  background: radial-gradient(circle at 50% 40%, #ffffff 0%, #e2e8f0 75%);
}

#canvas-wrap canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  outline: none;
}

/* Drawers */
.drawer {
  position: absolute;
  top: 10px;
  bottom: 10px;
  width: var(--drawer-w);
  z-index: 25;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  transition: transform 0.24s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.2s ease;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  user-select: none;
}

.left-drawer {
  left: 10px;
}

.left-drawer.collapsed {
  transform: translateX(calc(-1 * var(--drawer-w) - 18px));
  pointer-events: none;
}

.right-drawer {
  right: 10px;
}

.right-drawer.collapsed {
  transform: translateX(calc(var(--drawer-w) + 18px));
  pointer-events: none;
}

.drawer-scroll {
  overflow-y: auto;
  overflow-x: hidden;
  flex: 1;
  padding: 6px;
}

.drawer-scroll::-webkit-scrollbar {
  width: 5px;
}

.drawer-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.drawer-toggle {
  position: absolute;
  top: 22px;
  z-index: 26;
  width: 24px;
  height: 44px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-dim);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: left 0.24s cubic-bezier(0.22, 1, 0.36, 1), right 0.24s cubic-bezier(0.22, 1, 0.36, 1), color 0.15s;
  box-shadow: var(--shadow);
}

.drawer-toggle:hover {
  color: var(--accent);
}

.left-toggle {
  left: calc(var(--drawer-w) + 10px);
  border-left: none;
  border-radius: 0 8px 8px 0;
}

#left-panel.collapsed + .left-toggle {
  left: 0;
}

.right-toggle {
  right: calc(var(--drawer-w) + 10px);
  border-right: none;
  border-radius: 8px 0 0 8px;
}

#right-panel.collapsed + .right-toggle {
  right: 0;
}

body.tour-running .drawer-toggle {
  display: none !important;
}

/* Panel Sections */
.panel-sec {
  margin-bottom: 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  overflow: hidden;
}

.sec-hdr {
  width: 100%;
  appearance: none;
  background: var(--panel-2);
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 7px 9px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.panel-sec.collapsed .sec-hdr {
  border-bottom: none;
}

.panel-sec.collapsed .sec-body {
  display: none;
}

.panel-sec.collapsed .sec-chevron {
  transform: rotate(-90deg);
}

.sec-body {
  padding: 8px;
}

/* Architecture Tree */
.tree-root-lbl {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--accent);
  padding: 2px 4px 6px;
  border-bottom: 1px dashed var(--border);
  margin-bottom: 6px;
}

.tree-grp {
  margin-bottom: 5px;
}

.tree-grp-hdr {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  padding: 3px 4px;
  cursor: pointer;
  border-radius: 4px;
}

.tree-grp-hdr:hover {
  background: var(--panel-2);
  color: var(--text);
}

.tree-grp.collapsed .tree-grp-items {
  display: none;
}

.tree-grp-items {
  padding-left: 10px;
  border-left: 1px solid var(--border);
  margin-left: 6px;
  margin-top: 2px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tree-item {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 11px;
  text-align: left;
  padding: 4px 6px;
  border-radius: 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  transition: background 0.12s, color 0.12s;
}

.tree-item:hover {
  background: var(--panel-2);
  color: var(--text);
}

.tree-item.active {
  background: rgba(255, 47, 176, 0.16);
  color: var(--highlight);
  font-weight: 600;
}

:root[data-theme="light"] .tree-item.active {
  background: var(--highlight-dim);
}

.tree-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 1px 4px;
  border-radius: 3px;
  background: var(--panel-2);
  color: var(--text-muted);
}

/* Layer Visibility & Legend */
.layer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 7px;
}

.mini-btn {
  appearance: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 5px;
  cursor: pointer;
}

.mini-btn:hover {
  border-color: var(--accent);
}

.mini-btn.accent {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: rgba(95, 217, 196, 0.4);
}

.inline-chk {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-dim);
  cursor: pointer;
}

.layer-row {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 3px 2px;
  cursor: pointer;
  font-size: 11px;
  color: var(--text);
}

.layer-swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.legend-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 4px 0;
  border-bottom: 1px dashed var(--border);
}

.legend-row:last-child {
  border-bottom: none;
}

.legend-name {
  font-weight: 600;
  font-size: 11px;
}

.legend-note {
  font-size: 10px;
  color: var(--text-dim);
  line-height: 1.3;
}

/* Property Inspector & Dimensions */
.empty-inspector {
  color: var(--text-dim);
  font-size: 11px;
  line-height: 1.45;
  padding: 4px 2px;
}

.insp-title {
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 4px;
  color: var(--text);
}

.insp-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 600;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 8px;
}

.insp-kv {
  margin-bottom: 7px;
}

.insp-k {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.insp-v {
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--text-dim);
}

.insp-dims {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}

.dim-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  padding: 3px 0;
  font-size: 10.5px;
  border-bottom: 1px solid rgba(128, 128, 128, 0.12);
}

.dim-row:last-child {
  border-bottom: none;
}

.dim-lbl {
  color: var(--text-dim);
}

.dim-val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent);
  text-align: right;
  white-space: nowrap;
}

.node-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin-bottom: 8px;
}

.node-btn {
  appearance: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 5px 4px;
  border-radius: 5px;
  cursor: pointer;
}

.node-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: rgba(95, 217, 196, 0.5);
}

.lambda-summary {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  margin-bottom: 7px;
}

/* HUD Cards */
.hud-card {
  position: absolute;
  z-index: 20;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  user-select: none;
}

.hud-kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

/* Bottom-Left State Badge */
.state-badge {
  left: 14px;
  bottom: 12px;
  width: 222px;
  padding: 9px 10px;
  pointer-events: auto;
  transition: left 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.hud-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--amber);
}

.state-rows {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
}

.st-k {
  color: var(--text-dim);
}

.st-v {
  font-weight: 600;
  text-align: right;
}

.st-on { color: var(--green); }
.st-off { color: var(--red); }
.st-leak { color: var(--amber); }
.st-out1 { color: var(--cyan); }
.st-out0 { color: var(--gold); }

.state-banner {
  margin-top: 7px;
  padding: 5px 7px;
  border-radius: 6px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1.35;
  color: var(--text-dim);
}

.state-banner.frozen {
  border-color: rgba(245, 158, 11, 0.45);
  color: var(--amber);
}

.state-disclaimer {
  margin-top: 5px;
  font-size: 9.5px;
  color: var(--text-muted);
}

/* Bottom-Right View HUD */
.view-hud {
  right: 276px;
  bottom: 12px;
  width: 222px;
  transition: right 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

.view-hud-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

.view-hud.collapsed .view-hud-hdr {
  border-bottom: none;
}

.view-hud.collapsed .view-hud-body {
  display: none;
}

.hud-collapse-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 12px;
}

.view-hud-body {
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hud-subhdr {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.slider-row {
  display: grid;
  grid-template-columns: 16px 1fr 44px;
  align-items: center;
  gap: 6px;
  margin-bottom: 3px;
}

.slider-row label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
}

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

.val-readout {
  font-family: var(--font-mono);
  font-size: 10px;
  text-align: right;
  color: var(--text);
}

/* 3D Popover */
.popover {
  position: absolute;
  z-index: 30;
  width: 248px;
  padding: 10px 11px;
  background: var(--panel);
  border: 1px solid var(--highlight);
  border-radius: 9px;
  box-shadow: var(--shadow);
  transform: translate(-50%, calc(-100% - 14px));
  pointer-events: auto;
  user-select: none;
}

.popover::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -6px;
  transform: translateX(-50%) rotate(45deg);
  width: 10px;
  height: 10px;
  background: var(--panel);
  border-right: 1px solid var(--highlight);
  border-bottom: 1px solid var(--highlight);
}

.popover.flip-below {
  transform: translate(-50%, 16px);
}

.popover.flip-below::after {
  bottom: auto;
  top: -6px;
  border-right: none;
  border-bottom: none;
  border-left: 1px solid var(--highlight);
  border-top: 1px solid var(--highlight);
}

.pop-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.pop-layer {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--highlight);
}

.pop-close {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
}

.pop-title {
  font-weight: 700;
  font-size: 12px;
  margin-bottom: 4px;
}

.pop-role {
  font-size: 10.5px;
  line-height: 1.4;
  color: var(--text-dim);
}

.pop-dim {
  margin-top: 6px;
  padding-top: 5px;
  border-top: 1px dashed var(--border);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
}

/* Tour Banner */
.tour-hud {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  width: min(560px, calc(100% - 40px));
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 11px;
  padding: 11px 14px;
  box-shadow: var(--shadow);
}

.tour-top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.tour-step-pill {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--accent);
}

.tour-title {
  font-weight: 700;
  font-size: 13px;
  flex: 1;
}

.tour-stop-btn {
  appearance: none;
  background: rgba(239, 83, 80, 0.16);
  border: 1px solid rgba(239, 83, 80, 0.45);
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
}

.tour-script {
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.tour-progress-track {
  height: 4px;
  border-radius: 2px;
  background: var(--panel-2);
  overflow: hidden;
}

.tour-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  transition: width 0.3s ease;
}

/* Schematic Overlay */
.schematic-overlay {
  position: absolute;
  inset: 0;
  z-index: 22;
  background: #0a0d12;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

:root[data-theme="light"] .schematic-overlay {
  background: #f8fafc;
}

.sch-card {
  width: min(560px, 100%);
  max-height: 100%;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

.sch-hdr {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.sch-title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  color: var(--text);
}

.sch-sub {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}

.sch-hdr-btns {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

#nand2-schematic-svg {
  width: 100%;
  max-height: 62vh;
  display: block;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.sch-el {
  cursor: pointer;
}

.sch-hit {
  fill: transparent;
  stroke: transparent;
  stroke-width: 1.5;
  transition: fill 0.15s, stroke 0.15s;
}

.sch-el:hover .sch-hit {
  fill: rgba(95, 217, 196, 0.08);
  stroke: var(--accent);
}

.sch-el.active .sch-hit {
  fill: rgba(255, 47, 176, 0.12);
  stroke: var(--highlight);
}

.sch-rail, .sch-wire, .sch-ch, .sch-gate {
  fill: none;
  stroke: var(--text-dim);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.18s;
}

.sch-gate {
  stroke-width: 3;
  stroke: var(--green);
}

.sch-bubble {
  fill: var(--panel-2);
  stroke: var(--green);
  stroke-width: 2.2;
}

.sch-dot, .sch-pin-dot {
  fill: var(--accent);
}

.sch-lbl, .sch-dev {
  fill: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
}

.sch-dev-sub, .sch-node-lbl, .sch-state-txt {
  fill: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
}

.sch-el.sch-on .sch-ch,
.sch-el.sch-on .sch-wire {
  stroke: var(--green);
}

.sch-el.sch-off .sch-ch {
  stroke: var(--red);
}

.sch-el.sch-leak .sch-ch {
  stroke: var(--amber);
}

.sch-el.active .sch-wire,
.sch-el.active .sch-rail,
.sch-el.active .sch-ch {
  stroke: var(--highlight);
}

/* Voice Assistant FAB & Widget */
.va-launcher-btn {
  position: absolute;
  right: 276px;
  bottom: 242px;
  z-index: 32;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(95, 217, 196, 0.55);
  background: linear-gradient(145deg, var(--panel-2), var(--panel));
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: right 0.24s cubic-bezier(0.22, 1, 0.36, 1), transform 0.15s ease;
}

.va-launcher-btn:hover {
  transform: scale(1.06);
}

.va-fab-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(95, 217, 196, 0.35);
  animation: fabPulse 2.6s ease-out infinite;
  pointer-events: none;
}

@keyframes fabPulse {
  0% { transform: scale(0.95); opacity: 0.7; }
  100% { transform: scale(1.3); opacity: 0; }
}

.va-widget {
  position: absolute;
  right: 276px;
  bottom: 242px;
  z-index: 34;
  width: 330px;
  max-height: calc(100% - 260px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: right 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

.va-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 10px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}

.va-title-wrap {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.va-badge {
  font-family: var(--font-mono);
  font-size: 8.5px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.va-title {
  font-weight: 700;
  font-size: 12px;
}

.va-waveform {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 20px;
}

.va-waveform span {
  width: 3px;
  height: 5px;
  border-radius: 2px;
  background: var(--accent);
  transition: height 0.08s ease;
}

.va-hdr-actions {
  display: flex;
  gap: 4px;
}

.va-icon-btn {
  appearance: none;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 6px;
  width: 26px;
  height: 26px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
}

.va-icon-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.va-selectors {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 6px;
  padding: 7px 10px 4px;
}

.va-selectors select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 6px;
  font-size: 10.5px;
  font-family: var(--font-sans);
}

.va-context-bar {
  margin: 4px 10px;
  padding: 4px 7px;
  border-radius: 5px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.va-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 3px 10px 6px;
}

.va-chip {
  appearance: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 10px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.va-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.va-messages {
  flex: 1;
  min-height: 110px;
  max-height: 195px;
  overflow-y: auto;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.va-msg {
  padding: 7px 9px;
  border-radius: 8px;
  font-size: 11px;
  line-height: 1.4;
}

.va-msg.assistant {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  align-self: flex-start;
  max-width: 94%;
}

.va-msg.user {
  background: var(--accent-soft);
  border: 1px solid rgba(95, 217, 196, 0.35);
  color: var(--text);
  align-self: flex-end;
  max-width: 88%;
}

.va-msg.error {
  background: rgba(239, 83, 80, 0.12);
  border: 1px solid rgba(239, 83, 80, 0.4);
  color: var(--red);
}

.va-status-line {
  padding: 2px 10px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--text-muted);
}

.va-input-row {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px 9px;
  border-top: 1px solid var(--border);
  background: var(--panel);
}

.va-input-row input {
  flex: 1;
  min-width: 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 6px 8px;
  font-size: 11px;
}

.va-mic-btn, .va-send-btn, .va-stop-btn {
  appearance: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  width: 30px;
  height: 29px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.va-mic-btn.listening {
  border-color: var(--red);
  color: var(--red);
  background: rgba(239, 83, 80, 0.16);
}

.va-send-btn {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: rgba(95, 217, 196, 0.4);
}

.va-stop-btn {
  color: var(--amber);
  border-color: rgba(245, 158, 11, 0.45);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-card {
  width: min(410px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
}

.modal-card h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.modal-desc {
  margin: 0 0 10px;
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--text-dim);
}

.modal-card input[type="password"] {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  margin-bottom: 10px;
}

.modal-chk {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 14px;
  cursor: pointer;
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-actions-right {
  display: flex;
  gap: 6px;
}

.va-messages, #inspector-body {
  user-select: text;
}

/* Attribution Footer Bar */
#footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--footer-h);
  z-index: 50;
  background: var(--panel);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-dim);
  user-select: none;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-link:hover {
  color: var(--accent);
}

.footer-monogram {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
}

.footer-sep {
  color: var(--text-faint);
}

/* Responsive */
@media (max-width: 1180px) {
  .brand-eq {
    display: none;
  }
  .tb-controls {
    gap: 6px;
  }
  .seg-btn {
    padding: 4px 6px;
    font-size: 10px;
  }
  .tb-btn {
    padding: 5px 8px;
    font-size: 10px;
  }
  .tour-btn-inner {
    padding: 4px 8px;
  }
}

@media (max-width: 900px) {
  :root {
    --drawer-w: 230px;
  }
  .brand-text {
    display: none;
  }
  .state-badge {
    width: 206px;
  }
  .view-hud {
    width: 205px;
  }
  .va-widget {
    width: 295px;
  }
}

@media (max-width: 640px) {
  .va-widget {
    width: calc(100% - 28px);
    right: 14px !important;
    bottom: 14px;
  }
  .state-badge {
    display: none;
  }
}