/* ===== Loading Overlay ===== */
#loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #1a1a2e;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.4s ease;
}

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

.loading-content {
  text-align: center;
  width: 280px;
}

.loading-logo {
  font-size: 28px;
  font-weight: 700;
  color: #e0e0e8;
  letter-spacing: 1px;
  margin-bottom: 32px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 20px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: #6c63ff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-status {
  color: #888;
  font-size: 12px;
  margin-bottom: 16px;
  min-height: 18px;
}

.loading-bar-track {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  overflow: hidden;
}

.loading-bar-fill {
  height: 100%;
  width: 0%;
  background: #6c63ff;
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* ===== CSS Custom Properties (Theme) ===== */
:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #2a2a3c;
  --bg-tertiary: #363649;
  --bg-hover: #45455a;
  --bg-active: #525268;
  --bg-canvas: #2d2d3f;

  --text-primary: #e0e0e8;
  --text-secondary: #a0a0b4;
  --text-muted: #6e6e84;

  --accent: #7c6cf0;
  --accent-hover: #9589f5;
  --accent-dim: #5b4ec4;

  --success: #4caf84;
  --warning: #e8a838;
  --danger: #e85050;

  --border: #3a3a4e;
  --border-light: #4a4a5e;

  --nav-height: 36px;
  --toolbar-width: 44px;
  --sidebar-width: 280px;
  --ftree-width: 220px;
  --statusbar-height: 28px;

  --radius: 4px;
  --radius-lg: 8px;

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-size: 13px;
  --font-size-sm: 11px;
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  font-size: var(--font-size);
  color: var(--text-primary);
  background: var(--bg-primary);
  user-select: none;
  -webkit-user-select: none;
}

/* ===== Top Navigation ===== */
#top-nav {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 12px;
  gap: 8px;
}

.nav-brand {
  font-weight: 700;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.5px;
  margin-right: 12px;
}

.nav-menus {
  display: flex;
  gap: 2px;
  flex: 1;
  position: relative;
}

.nav-menu-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-size);
  padding: 4px 10px;
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-menu-btn:hover,
.nav-menu-btn.open {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* Dropdown menus */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1002;
  min-width: 200px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: 0 6px 16px rgba(0,0,0,0.5);
  padding: 4px 0;
  font-size: var(--font-size);
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  color: var(--text-primary);
  cursor: pointer;
  white-space: nowrap;
}

.nav-dropdown-item:hover {
  background: var(--accent-dim, rgba(124,108,240,0.15));
}

.nav-dropdown-item.disabled {
  color: var(--text-muted);
  pointer-events: none;
}

.nav-dropdown-item .shortcut {
  color: var(--text-muted);
  font-size: 11px;
  margin-left: 24px;
}

.nav-dropdown-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ===== Connection Indicator ===== */
.indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.indicator.disconnected {
  background: var(--danger);
}

.indicator.connected {
  background: var(--success);
}

.indicator.connecting {
  background: var(--warning);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ===== Main Layout (CSS Grid) ===== */
#app-layout {
  display: grid;
  grid-template-columns: var(--toolbar-width) 1fr var(--ftree-width) var(--sidebar-width);
  grid-template-rows: 1fr;
  height: calc(100vh - var(--nav-height) - var(--statusbar-height));
}

/* ===== Left Toolbar ===== */
#toolbar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 0;
  gap: 2px;
  overflow-y: auto;
}

#toolbar-separator {
  width: 28px;
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

.tool-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  border-radius: var(--radius);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  position: relative;
}

.tool-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tool-btn.active {
  background: var(--accent-dim);
  color: #fff;
}

.tool-btn svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Tooltip */
.tool-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
  z-index: 100;
  border: 1px solid var(--border);
}

.tool-btn:hover::after {
  opacity: 1;
}

/* ===== Canvas Area ===== */
#canvas-area {
  position: relative;
  overflow: hidden;
  background: #1a1a2e;
}

#canvas-container {
  width: 100%;
  height: 100%;
  position: relative;
}

#cnc-container {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  background: #111122;
}

#three-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

#fabric-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

#fabric-wrapper .canvas-container {
  width: 100% !important;
  height: 100% !important;
}

#fabric-canvas {
  position: absolute;
  top: 0;
  left: 0;
}

/* ===== Sketch Tabs ===== */
#sketch-tabs {
  display: flex;
  align-items: center;
  height: 32px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 0 4px;
  gap: 2px;
  overflow: hidden;
}

#sketch-tab-list {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  max-width: calc(100% - 32px);
}

#sketch-tab-list::-webkit-scrollbar { display: none; }

.sketch-tab {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  white-space: nowrap;
  min-width: 0;
  flex-shrink: 0;
  transition: background 0.15s;
}

.sketch-tab:hover { background: var(--bg-hover); }

.sketch-tab.active {
  background: var(--bg-canvas);
  color: var(--text-primary);
  border-color: var(--accent-dim);
  border-bottom: 1px solid var(--bg-canvas);
  margin-bottom: -1px;
}

.sketch-tab-name {
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sketch-tab-plane {
  font-size: 9px;
  color: var(--text-muted);
  padding: 1px 4px;
  background: var(--bg-tertiary);
  border-radius: 3px;
}

.sketch-tab-eye {
  display: flex;
  align-items: center;
  padding: 2px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 2px;
}

.sketch-tab-eye:hover { color: var(--text-primary); }
.sketch-tab-eye.hidden { opacity: 0.3; }

.sketch-tab-height {
  width: 32px;
  padding: 1px 3px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 10px;
  text-align: center;
}

.sketch-tab-height:focus { border-color: var(--accent); outline: none; }

.sketch-tab-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  border-radius: 2px;
  padding: 0;
  margin-left: 2px;
}

.sketch-tab-close:hover {
  background: var(--danger);
  color: #fff;
}

#sketch-tab-add {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 1px dashed var(--border);
  border-radius: 4px;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  margin-left: 2px;
}

#sketch-tab-add:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

/* ===== Mode Toggle ===== */
#mode-toggle {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0;
  z-index: 5;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
}

.mode-btn {
  padding: 5px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: var(--font-size);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.mode-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.mode-btn.active {
  background: var(--accent-dim);
  color: #fff;
}

#canvas-info {
  position: absolute;
  bottom: 8px;
  left: 8px;
  display: flex;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  background: rgba(30, 30, 46, 0.85);
  padding: 4px 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  z-index: 2;
}

/* ===== Feature Tree Column ===== */
#feature-tree-column {
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

.ftc-header {
  padding: 8px 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#feature-tree-content {
  flex: 1;
  padding: 6px 0;
  overflow-y: auto;
}

.ftc-empty {
  display: block;
  padding: 12px 10px;
  color: var(--text-muted);
  font-size: 11px;
}

.ftc-solid-label {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
}

/* Feature node */
.ft-node {
  border-bottom: 1px solid var(--border);
}

.ft-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  cursor: default;
  font-size: 11px;
  color: var(--text-primary);
}

.ft-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.ft-icon {
  font-size: 12px;
  opacity: 0.6;
  width: 14px;
  text-align: center;
  flex-shrink: 0;
}

.ft-label {
  flex: 1;
  font-weight: 500;
}

.ft-badge {
  font-size: 9px;
  color: var(--text-muted);
  background: var(--bg-primary);
  border-radius: 3px;
  padding: 1px 4px;
}

.ft-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0 2px;
  opacity: 0;
  transition: opacity 0.15s;
}

.ft-header:hover .ft-remove {
  opacity: 1;
}

.ft-remove:hover {
  color: var(--danger);
}

.ft-remove-inline {
  opacity: 0;
  font-size: 12px;
  margin-left: 2px;
}

.ft-param:hover .ft-remove-inline {
  opacity: 1;
}

/* Feature parameters */
.ft-params {
  padding: 0 10px 6px 30px;
}

.ft-param {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 3px;
  font-size: 10px;
  color: var(--text-secondary);
}

.ft-param > span:first-child {
  flex: 1;
  white-space: nowrap;
}

.ft-input {
  width: 56px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 10px;
  padding: 2px 4px;
  text-align: right;
  font-family: var(--font-mono);
}

.ft-input:focus {
  outline: none;
  border-color: var(--accent);
}

select.ft-input {
  text-align: left;
  font-family: var(--font);
  cursor: pointer;
}

.ft-unit {
  color: var(--text-muted);
  font-size: 9px;
  width: 18px;
}

.ft-hint {
  color: var(--text-muted);
  font-size: 9px;
  opacity: 0.7;
}

.ft-readonly {
  color: var(--text-muted);
  font-style: italic;
}

.ft-actions {
  padding: 4px 10px 8px 10px;
  display: flex;
  gap: 4px;
}

.ft-btn {
  flex: 1;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-secondary);
  font-size: 10px;
  padding: 3px 6px;
  cursor: pointer;
}

.ft-btn:hover {
  background: var(--border);
  color: var(--text-primary);
}

.ft-btn-danger:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

/* Add bar at bottom of feature tree */
.ft-add-bar {
  padding: 8px 10px;
  display: flex;
  gap: 4px;
  border-top: 1px solid var(--border);
}

.ft-add-btn {
  font-weight: 500;
  font-size: 9px;
  padding: 4px 3px;
}

.ft-add-bar-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
}

.ft-check {
  accent-color: var(--accent);
}

/* Add operation form */
.ft-add-form {
  border-top: 1px solid var(--accent);
  background: rgba(108, 99, 255, 0.06);
  padding: 8px 10px;
}

.ft-add-form-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}

.ft-add-form-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0 2px;
}

.ft-add-form-close:hover {
  color: var(--danger);
}

.ft-add-form-hint {
  font-size: 9px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-style: italic;
}

.ft-add-form-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 4px;
  font-size: 10px;
  color: var(--text-secondary);
}

.ft-add-form-row label {
  width: 48px;
  flex-shrink: 0;
}

.ft-add-form-row .ft-input {
  flex: 1;
}

.ft-add-form-actions {
  display: flex;
  gap: 4px;
  margin-top: 6px;
}

.ft-add-form-actions .ft-btn {
  flex: 1;
}

/* Edge number labels (HTML overlays on canvas) */
.edge-label-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

.edge-label {
  position: absolute;
  transform: translate(-50%, -50%);
  background: rgba(108, 99, 255, 0.85);
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  font-family: var(--font-mono);
  min-width: 16px;
  height: 16px;
  line-height: 16px;
  text-align: center;
  border-radius: 8px;
  padding: 0 4px;
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
}

.face-label-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

.face-label {
  position: absolute;
  transform: translate(-50%, -50%);
  background: rgba(255, 160, 40, 0.9);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  font-family: var(--font-mono);
  min-width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  border-radius: 4px;
  padding: 0 5px;
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
}

/* ===== Right Sidebar ===== */
#sidebar {
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
}

#sidebar-panels {
  display: flex;
  flex-direction: column;
}

/* Panel styling */
.panel {
  border-bottom: 1px solid var(--border);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  cursor: pointer;
  font-size: var(--font-size);
  font-weight: 600;
  color: var(--text-secondary);
}

.panel-header:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.panel-header .panel-icon {
  margin-right: 8px;
  font-size: 14px;
}

.panel-header .panel-chevron {
  transition: transform 0.2s;
  font-size: 10px;
  color: var(--text-muted);
}

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

.panel-body {
  padding: 8px 12px 12px;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

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

/* Panel form elements */
.panel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.panel-label {
  color: var(--text-secondary);
}

.panel-input {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 4px 8px;
  font-size: var(--font-size-sm);
  font-family: var(--font-mono);
  width: 80px;
}

.panel-input:focus {
  outline: none;
  border-color: var(--accent);
}

.color-swatch:hover {
  border-color: rgba(255,255,255,0.5) !important;
  transform: scale(1.15);
}

.panel-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 4px 6px;
  font-size: var(--font-size-sm);
}

/* CNC Panel — compact layout */
.cnc-panel .panel-body.collapsed { display: none; }
.cnc-panel select.panel-input {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 3px 5px;
  font-size: var(--font-size-sm);
}
.cnc-full-w { width: 100%; }
.cnc-compact-row { margin: 4px 0; }
.cnc-input-group {
  display: flex;
  align-items: center;
  gap: 3px;
}
.cnc-input-group .panel-input { flex: 1; min-width: 0; }
.cnc-lbl {
  font-size: 10px;
  color: var(--text-muted);
  min-width: 14px;
  text-align: right;
  flex-shrink: 0;
}
.cnc-sm-btn {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 11px;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}
.cnc-sm-btn:hover { background: var(--bg-hover); }
.cnc-accent-btn {
  background: var(--accent-dim) !important;
  border-color: var(--accent) !important;
  font-weight: 600;
}
.cnc-accent-btn:hover { background: var(--accent) !important; }
.cnc-section { margin: 4px 0; }
.cnc-divider {
  border-top: 1px solid var(--border);
  margin: 6px 0;
}
.cnc-section-label {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 4px 0 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.cnc-badge {
  background: var(--accent-dim);
  color: var(--accent);
  padding: 0 5px;
  border-radius: 8px;
  font-size: 10px;
  font-weight: 600;
}
/* Stats */
.cnc-stats-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 8px;
  font-size: 11px;
}
.cnc-stat-label { color: var(--text-secondary); }
.cnc-stat-value { color: var(--text-primary); text-align: right; }
.cnc-text-muted { color: var(--text-muted); font-size: 10px; }
.cnc-stats-empty {
  color: var(--text-muted);
  font-size: 11px;
  font-style: italic;
  padding: 2px 0;
}
/* Alignment grid */
.cnc-align-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 2px;
  max-width: 110px;
}
.cnc-align-btn {
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 13px;
  cursor: pointer;
  text-align: center;
  line-height: 1;
  transition: background 0.15s;
}
.cnc-align-btn:hover { background: var(--bg-hover); }
.cnc-align-center {
  grid-column: 3;
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-color: var(--accent);
  font-size: 15px;
}
.cnc-align-center:hover { background: var(--accent); }
/* Operation/tool descriptions — compact */
.cnc-op-desc {
  font-size: 10px;
  line-height: 1.4;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-left: 2px solid var(--accent-dim);
  padding: 4px 6px;
  margin: 2px 0 4px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.cnc-op-desc b { display: none; }
.cnc-op-desc em { color: var(--accent); font-style: normal; font-weight: 500; }
.cnc-tool-desc { border-left-color: var(--text-muted); }
/* Pass list */
.cnc-pass-list { max-height: 140px; overflow-y: auto; }
.cnc-pass-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 4px;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
}
.cnc-pass-item:last-child { border-bottom: none; }
.cnc-pass-num {
  background: var(--bg-tertiary);
  border-radius: 50%;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent);
  flex-shrink: 0;
}
.cnc-pass-info { flex: 1; min-width: 0; }
.cnc-pass-label { display: block; font-weight: 500; color: var(--text-primary); }
.cnc-pass-tool { display: block; font-size: 10px; color: var(--text-muted); }
.cnc-pass-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 0 2px;
  line-height: 1;
}
.cnc-pass-remove:hover { color: #ff4444; }
.cnc-pass-summary { margin-top: 4px; }
.cnc-stat-pass {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  padding: 2px 0;
  color: var(--text-secondary);
}
/* GCode Preview Modal */
.cnc-gcode-modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cnc-gcode-modal-content {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: min(90vw, 700px);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.cnc-gcode-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.cnc-gcode-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
}
.cnc-gcode-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}
.cnc-gcode-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}
.cnc-gcode-close:hover { color: var(--text-primary); }
.cnc-gcode-stats {
  padding: 4px 14px;
  font-size: 11px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.cnc-gcode-pre {
  flex: 1;
  overflow: auto;
  padding: 10px 14px;
  margin: 0;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-secondary);
  tab-size: 4;
}
/* GCode syntax colors */
.gc-ln { color: var(--text-muted); user-select: none; }
.gc-comment { color: #6a9955; }
.gc-rapid { color: #dcdcaa; }
.gc-cut { color: #4ec9b0; }
.gc-mcode { color: #ce9178; }

/* ---- CNC Simulation Controls ---- */
.cnc-sim-controls { display: flex; flex-direction: column; gap: 6px; }
.cnc-sim-transport {
  display: flex; gap: 4px; align-items: center; justify-content: center;
}
.cnc-sim-btn {
  width: 32px; height: 32px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-tertiary); color: var(--text-primary);
  font-size: 14px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.cnc-sim-btn:hover { background: var(--bg-hover); }
.cnc-sim-play-btn {
  width: 44px; background: var(--accent);
  border-color: var(--accent); color: #fff;
}
.cnc-sim-play-btn:hover { filter: brightness(1.2); }
.cnc-sim-speed-row {
  display: flex; align-items: center; gap: 4px;
}
.cnc-sim-slider {
  flex: 1; height: 4px; accent-color: var(--accent);
  cursor: pointer;
}
.cnc-sim-speed-val {
  font-size: 11px; color: var(--text-muted);
  min-width: 28px; text-align: right;
}
.cnc-sim-progress-row { display: flex; }
.cnc-sim-scrubber {
  width: 100%; height: 6px; accent-color: var(--accent);
  cursor: pointer;
}
.cnc-sim-readout {
  display: flex; justify-content: space-between;
  font-size: 11px; color: var(--text-muted);
}
.cnc-sim-status { font-weight: 600; }
.cnc-sim-type-cut { color: #4ec9b0; }
.cnc-sim-type-rapid { color: #dcdcaa; }
.cnc-sim-type-plunge { color: #ff5555; }
.cnc-sim-type-done { color: #6a9955; }
.cnc-sim-pos { font-family: 'SF Mono', 'Fira Code', monospace; font-size: 10px; }
.cnc-sim-pct { font-weight: 600; color: var(--text-primary); }
.cnc-sim-time { font-size: 10px; }

/* ---- CNC Right Panel (GCode + Jog) ---- */
#cnc-right-panel {
  grid-column: 3;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.cnc-right-section {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.cnc-right-gcode {
  flex: 1;
  min-height: 0;
  border-bottom: 1px solid var(--border);
}
.cnc-right-jog {
  flex: 0 0 auto;
}
.cnc-right-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}
.cnc-right-actions { display: flex; gap: 3px; }
.cnc-gcode-info {
  padding: 2px 8px;
  font-size: 10px;
  color: var(--text-muted);
}
.cnc-rp-gcode-pre {
  flex: 1;
  overflow: auto;
  margin: 0;
  padding: 4px 6px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 10px;
  line-height: 1.45;
  color: var(--text-primary);
  background: var(--bg-primary);
  tab-size: 4;
  white-space: pre;
}
.cnc-rp-empty {
  color: var(--text-muted);
  font-style: italic;
  font-family: inherit;
}

/* Jog controls */
.cnc-jog-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 3px;
  padding: 6px 8px;
}
.cnc-jog-spacer {}
.cnc-jog-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px 2px;
  min-height: 36px;
  transition: background 0.12s, border-color 0.12s;
}
.cnc-jog-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
}
.cnc-jog-btn:active {
  background: var(--accent);
  color: #fff;
}
.cnc-jog-arrow { font-size: 12px; line-height: 1; }
.cnc-jog-label { font-size: 9px; color: var(--text-muted); margin-top: 1px; }
.cnc-jog-btn:active .cnc-jog-label { color: #fff; }
.cnc-jog-home {
  background: var(--bg-hover);
  border-color: var(--border-light);
}
.cnc-jog-home-icon { font-size: 16px; }
.cnc-jog-step-select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 10px;
  padding: 1px 4px;
  cursor: pointer;
}
.cnc-jog-actions {
  display: flex;
  gap: 3px;
  padding: 0 8px 6px;
}
.cnc-jog-actions .cnc-sm-btn { flex: 1; font-size: 10px; }
.cnc-jog-stop {
  background: #552222 !important;
  border-color: #883333 !important;
  color: #ff6666 !important;
  font-weight: 700;
}
.cnc-jog-stop:hover {
  background: #773333 !important;
}
.cnc-jog-unlock {
  background: #223322 !important;
  border-color: #338833 !important;
  color: #66cc66 !important;
}
.cnc-jog-position {
  display: flex;
  gap: 8px;
  padding: 4px 8px 6px;
  justify-content: center;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
}
.cnc-jog-pos-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.cnc-jog-pos-axis {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
}
.cnc-jog-pos-val {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--text-primary);
  min-width: 48px;
  text-align: right;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s;
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-light);
}

.btn:active {
  background: var(--bg-active);
}

.btn-primary {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: #fff;
}

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

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

.btn-sm {
  padding: 3px 8px;
  font-size: 10px;
}

.btn-block {
  width: 100%;
}

.btn-group {
  display: flex;
  gap: 4px;
}

.btn-group .btn {
  flex: 1;
}

/* ===== Status Bar ===== */
#status-bar {
  display: flex;
  align-items: center;
  height: var(--statusbar-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 0 12px;
  gap: 16px;
  font-size: var(--font-size-sm);
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.status-section {
  display: flex;
  align-items: center;
  gap: 6px;
}

#status-position span {
  margin-right: 8px;
}

#job-progress-bar {
  width: 80px;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
}

#job-progress-fill {
  width: 0%;
  height: 100%;
  background: var(--accent);
  transition: width 0.3s;
}

/* ===== Toast Notifications ===== */
#toast-container {
  position: fixed;
  bottom: 40px;
  right: 16px;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  z-index: 1000;
}

.toast {
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: var(--font-size);
  max-width: 320px;
  animation: slideIn 0.2s ease-out;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.success { border-left: 3px solid var(--success); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.info    { border-left: 3px solid var(--accent); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to   { transform: translateX(0); opacity: 1; }
}

/* ===== Edge Operation Popup ===== */
.edge-op-popup {
  position: fixed;
  z-index: 1000;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  min-width: 160px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  font-size: 12px;
  color: var(--text-primary);
}

.edge-op-popup-header {
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.edge-op-popup-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.edge-op-popup-row label {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 12px;
}

.edge-op-popup-row input[type="radio"] {
  accent-color: var(--accent);
}

.edge-op-radius {
  width: 60px;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 12px;
  outline: none;
}

.edge-op-radius:focus {
  border-color: var(--accent);
}

.edge-op-unit {
  color: var(--text-muted);
  font-size: 11px;
}

.edge-op-popup-actions {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}

.edge-op-popup-actions button {
  flex: 1;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 11px;
  cursor: pointer;
}

.edge-op-popup-actions button:hover {
  background: var(--bg-hover);
}

.edge-op-apply {
  background: var(--accent-dim) !important;
  border-color: var(--accent) !important;
}

.edge-op-apply:hover {
  background: var(--accent) !important;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--bg-active);
}

/* ===== Zoom Controls ===== */
#zoom-controls {
  position: absolute;
  bottom: 8px;
  right: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(30, 30, 46, 0.9);
  padding: 4px 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  z-index: 2;
}

.zoom-btn {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0;
}

.zoom-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.zoom-btn svg {
  stroke: currentColor;
  fill: none;
}

#zoom-slider {
  width: 100px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-tertiary);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

#zoom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.zoom-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  min-width: 40px;
  text-align: center;
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.modal-large {
  width: 80vw;
  height: 75vh;
  max-width: 1200px;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 14px;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#three-container {
  flex: 1;
  background: #111122;
  position: relative;
}

#extrude-controls {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
}

#extrude-controls .panel-row {
  margin-bottom: 0;
}

/* ===== Extrude dimension label (follows cursor during drag) ===== */
/* Smart 3D move HUD */
.smart3d-move-hud {
  position: fixed;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(30, 30, 50, 0.92);
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(6px);
  white-space: nowrap;
}

.smart3d-hud-btn {
  background: var(--bg-tertiary, #2a2a40);
  color: var(--text-primary, #e0e0e0);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.smart3d-hud-btn:hover {
  background: var(--accent, #6c63ff);
  border-color: var(--accent, #6c63ff);
  color: #fff;
}

.smart3d-hud-btn.active {
  background: var(--accent, #6c63ff);
  border-color: var(--accent, #6c63ff);
  color: #fff;
}

.smart3d-hud-hint {
  color: var(--text-muted, #888);
  font-size: 11px;
}

.extrude-dim-label {
  position: fixed;
  z-index: 1000;
  background: rgba(30, 30, 50, 0.92);
  color: #4fc3f7;
  font-size: 13px;
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
  padding: 3px 10px;
  border-radius: 4px;
  border: 1px solid rgba(79, 195, 247, 0.4);
  pointer-events: none;
  white-space: nowrap;
  backdrop-filter: blur(4px);
}

/* ===== Extrude dimension input (shown after drag release) ===== */
.extrude-dim-input {
  position: fixed;
  z-index: 1100;
  transform: translateX(-50%);
  background: var(--bg-secondary, #1e1e2e);
  border: 1px solid var(--accent, #4fc3f7);
  border-radius: 8px;
  padding: 10px 14px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-primary, #e0e0e0);
}

.extrude-dim-input label {
  font-weight: 500;
  white-space: nowrap;
  color: var(--text-secondary, #aaa);
}

.extrude-dim-input input[type="number"] {
  width: 80px;
  padding: 4px 8px;
  border: 1px solid var(--border, #444);
  border-radius: 4px;
  background: var(--bg-primary, #111);
  color: #4fc3f7;
  font-size: 13px;
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
  outline: none;
  text-align: right;
}

.extrude-dim-input input[type="number"]:focus {
  border-color: var(--accent, #4fc3f7);
  box-shadow: 0 0 0 2px rgba(79, 195, 247, 0.2);
}

.extrude-dim-actions {
  display: flex;
  gap: 4px;
}

.extrude-dim-actions button {
  padding: 4px 10px;
  border: 1px solid var(--border, #444);
  border-radius: 4px;
  background: var(--bg-primary, #111);
  color: var(--text-primary, #e0e0e0);
  font-size: 11px;
  cursor: pointer;
}

.extrude-dim-actions button.extrude-dim-ok {
  background: rgba(79, 195, 247, 0.2);
  border-color: rgba(79, 195, 247, 0.4);
  color: #4fc3f7;
}

.extrude-dim-actions button:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ===== Status bar spacer ===== */
.status-spacer {
  flex: 1;
}