:root {
  --bg-main: #0a0c10;
  --bg-sidebar: #10141d;
  --bg-card: #161b26;
  --bg-card-hover: #1c2331;
  --border-color: #273142;
  --border-light: #364359;
  
  --text-primary: #f0f6fc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-cyan: #00d2ff;
  --accent-red: #ff3366;
  --accent-green: #00f59b;
  --accent-amber: #ffb703;
  --accent-blue: #3a86ff;
  --accent-purple: #9d4edd;

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* App Header */
.app-header {
  height: 64px;
  background-color: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 20;
}

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #00d2ff 0%, #3a86ff 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  box-shadow: 0 0 16px rgba(0, 210, 255, 0.4);
}

.logo-icon svg {
  width: 22px;
  height: 22px;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.accent-text {
  color: var(--accent-cyan);
}

.badge-ai {
  font-size: 0.65rem;
  font-weight: 700;
  background: linear-gradient(90deg, #9d4edd, #ff3366);
  padding: 2px 8px;
  border-radius: 6px;
  letter-spacing: 0.8px;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Machine Preset Bar */
.header-presets {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  padding: 4px 6px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
}

.preset-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  padding-left: 8px;
  font-weight: 600;
  text-transform: uppercase;
}

.preset-buttons {
  display: flex;
  gap: 4px;
}

.btn-preset {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

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

.btn-preset.active {
  background: var(--accent-cyan);
  color: #06090e;
  box-shadow: 0 0 12px rgba(0, 210, 255, 0.35);
}

/* Header Action Buttons */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-primary {
  background: linear-gradient(135deg, #00d2ff 0%, #0077ff 100%);
  color: #040810;
  font-weight: 700;
  font-size: 0.88rem;
  padding: 9px 18px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 14px rgba(0, 210, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.45);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
}

.btn-ghost {
  background: transparent;
  color: var(--accent-amber);
  border: 1px solid rgba(255, 183, 3, 0.3);
  padding: 8px 14px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.btn-ghost:hover {
  background: rgba(255, 183, 3, 0.1);
  border-color: var(--accent-amber);
}

/* Layout */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.workspace-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar Controls */
.sidebar-controls {
  width: 360px;
  min-width: 340px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.control-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-size: 0.88rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.step-num {
  background: var(--border-light);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.btn-link {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
}
.btn-link:hover {
  color: var(--accent-cyan);
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border-light);
  border-radius: 10px;
  padding: 18px 12px;
  text-align: center;
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
  position: relative;
}

.drop-zone.dragover, .drop-zone:hover {
  border-color: var(--accent-cyan);
  background-color: rgba(0, 210, 255, 0.05);
}

.upload-icon {
  width: 32px;
  height: 32px;
  color: var(--accent-cyan);
  margin-bottom: 6px;
}

.drop-text {
  font-size: 0.85rem;
  font-weight: 600;
}

.drop-subtext {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.thumb-preview {
  position: relative;
  width: 100%;
  height: 120px;
  border-radius: 8px;
  overflow: hidden;
}

.thumb-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

.btn-remove {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
}

/* Samples */
.samples-wrapper {
  margin-top: 4px;
}

.samples-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.sample-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.sample-chip {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.sample-chip:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  background: rgba(0, 210, 255, 0.08);
}

/* Setting Items */
.setting-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setting-item label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-select, .form-input {
  width: 100%;
  background-color: var(--bg-main);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-select:focus, .form-input:focus {
  border-color: var(--accent-cyan);
}

.form-input.readonly {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  cursor: default;
}

.toggle-row {
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 8px;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
}

.ai-highlight {
  border-left: 3px solid var(--accent-purple);
}

.stencil-highlight {
  border-left: 3px solid var(--accent-amber);
}

.toggle-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toggle-title {
  font-size: 0.8rem !important;
  font-weight: 700 !important;
  color: var(--text-primary) !important;
  display: flex;
  align-items: center;
  gap: 4px;
}

.badge-tag {
  background: var(--accent-amber);
  color: #000;
  font-size: 0.6rem;
  padding: 1px 5px;
  border-radius: 4px;
  font-weight: 800;
}

.toggle-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Switch Toggle */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border-light);
  transition: .3s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
}

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

input:checked + .slider:before {
  transform: translateX(18px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Range Sliders */
.range-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.val-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(0, 210, 255, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
}

input[type=range] {
  -webkit-appearance: none;
  width: 100%;
  height: 5px;
  background: var(--border-light);
  border-radius: 5px;
  outline: none;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(0, 210, 255, 0.6);
}

.checkbox-subrow {
  display: flex;
  gap: 16px;
  margin-top: 4px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.field-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* Dimension Grid */
.dimension-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.dim-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dim-col label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Main Canvas Area */
.canvas-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-main);
  position: relative;
  overflow: hidden;
}

/* Canvas Toolbar */
.canvas-toolbar {
  height: 48px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-sidebar);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

.view-mode-tabs {
  display: flex;
  background: var(--bg-card);
  padding: 3px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.view-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.view-tab.active {
  background: var(--border-light);
  color: var(--text-primary);
}

.cad-layer-indicators {
  display: flex;
  gap: 12px;
}

.overlay-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.overlay-controls span {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.layer-pill {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.4);
}

.layer-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.layer-outer {
  color: var(--accent-red);
}
.layer-outer .dot {
  background-color: var(--accent-red);
  box-shadow: 0 0 6px var(--accent-red);
}

.layer-inner {
  color: var(--accent-cyan);
}
.layer-inner .dot {
  background-color: var(--accent-cyan);
  box-shadow: 0 0 6px var(--accent-cyan);
}

.layer-engrave {
  color: var(--accent-green);
}
.layer-engrave .dot {
  background-color: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
}

.viewport-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-icon {
  width: 28px;
  height: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  cursor: pointer;
  font-size: 0.85rem;
}

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

.btn-icon.active {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.zoom-text {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  width: 44px;
  text-align: right;
}

/* Canvas Stage */
.canvas-stage {
  flex: 1;
  position: relative;
  overflow: hidden;
  /* CAD Cutting Bed Grid pattern */
  background-color: #0b0f17;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 20px 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
}

.canvas-stage.dragging {
  cursor: grabbing;
}

#cadCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

.preview-pane {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
}

.preview-pane img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  box-shadow: 0 0 24px rgba(0,0,0,0.8);
  border: 1px solid var(--border-color);
}

/* Empty State */
.empty-state {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 420px;
  gap: 12px;
  pointer-events: none;
}

.empty-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.empty-icon svg {
  width: 32px;
  height: 32px;
}

.empty-state h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.empty-state p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  z-index: 15;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid var(--border-light);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-msg {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* CNC Bottom Stats Bar */
.cnc-stats-bar {
  height: 56px;
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 32px;
}

.stat-box {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-value.highlight {
  color: var(--accent-green);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  width: 480px;
  max-width: 90vw;
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.btn-close:hover {
  color: #fff;
}

.ai-input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.ai-input-group label {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.full-width {
  width: 100%;
}

.ai-results {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ai-metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.ai-metric-item {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: 6px;
  text-align: center;
}

.ai-metric-item .label {
  font-size: 0.65rem;
  color: var(--text-muted);
}

.ai-metric-item .val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: bold;
  color: var(--accent-cyan);
  margin-top: 2px;
}

.ai-advice-box {
  background: rgba(0, 210, 255, 0.05);
  border: 1px solid rgba(0, 210, 255, 0.2);
  border-radius: 8px;
  padding: 12px;
}

.ai-advice-box h4 {
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 6px;
}

.ai-advice-box p {
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--text-secondary);
}

.hidden {
  display: none !important;
}