:root {
  --bg-dark: #090d16;
  --bg-panel: rgba(16, 23, 38, 0.92);
  --bg-card: rgba(26, 36, 56, 0.78);
  --border-subtle: rgba(148, 163, 184, 0.18);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --accent-gold: #d4af37;
  --accent-emerald: #00a86b;
  --accent-crimson: #c41e3a;
  --accent-brown: #7c4f32;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  height: 100vh;
  height: 100dvh;
  width: 100vw;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Loading Overlay */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, #141d2f 0%, #070a12 100%);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.35s ease;
}

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

.loader-card {
  background: var(--bg-panel);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 16px;
  padding: 32px 40px;
  max-width: 460px;
  text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.65);
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(212, 175, 55, 0.2);
  border-top-color: var(--accent-gold);
  border-radius: 50%;
  margin: 0 auto 18px;
  animation: spin 0.9s linear infinite;
}

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

.loader-card h2 {
  font-size: 1.2rem;
  color: var(--accent-gold);
  margin-bottom: 8px;
}

.loader-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.progress-bar-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 15%;
  background: linear-gradient(90deg, var(--accent-emerald), var(--accent-gold));
  transition: width 0.2s ease;
}

/* Top Navigation Bar */
.top-bar {
  height: 62px;
  background: rgba(12, 18, 30, 0.96);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
  gap: 14px;
  z-index: 20;
}

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

.brand-badge {
  background: linear-gradient(135deg, #d4af37, #a67c00);
  color: #090d16;
  font-weight: 800;
  font-size: 0.72rem;
  padding: 4px 8px;
  border-radius: 6px;
  letter-spacing: 0.05em;
}

.brand h1 {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand .subtitle {
  font-size: 0.74rem;
  color: var(--text-muted);
}

.mode-tabs {
  display: flex;
  gap: 6px;
  background: rgba(255, 255, 255, 0.04);
  padding: 4px;
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
}

.mode-tab {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 7px 13px;
  border-radius: 7px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: all 0.18s ease;
}

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

.mode-tab.active {
  background: linear-gradient(135deg, rgba(0, 168, 107, 0.28), rgba(212, 175, 55, 0.25));
  color: #ffffff;
  border: 1px solid rgba(212, 175, 55, 0.45);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.tab-num {
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  font-size: 0.72rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mode-tab.active .tab-num {
  background: var(--accent-gold);
  color: #090d16;
  font-weight: 800;
}

.quick-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 5px 10px;
  border-radius: 99px;
  font-size: 0.76rem;
  cursor: pointer;
  user-select: none;
}

.toggle-pill input {
  accent-color: var(--accent-emerald);
}

/* Workspace Layout */
.workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.side-panel {
  width: 390px;
  min-width: 390px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-subtle);
  overflow-y: auto;
  padding: 14px;
  z-index: 10;
}

.mode-panel {
  display: none;
  flex-direction: column;
  gap: 14px;
}

.mode-panel.active {
  display: flex;
}

.panel-section {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 13px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.section-header h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: #e2e8f0;
}

.status-pill {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 99px;
  background: rgba(148, 163, 184, 0.16);
  color: var(--text-muted);
}

.status-pill.online {
  background: rgba(0, 168, 107, 0.22);
  color: #34d399;
  border: 1px solid rgba(52, 211, 153, 0.35);
}

.control-group {
  margin-bottom: 11px;
}

.control-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  margin-bottom: 5px;
  color: var(--text-muted);
}

.control-label-row strong {
  color: var(--text-main);
}

.text-emerald { color: #34d399 !important; }
.text-crimson { color: #f87171 !important; }

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

.segmented-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: 5px;
}

.seg-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.seg-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.seg-btn.active {
  background: rgba(212, 175, 55, 0.22);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.small-label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.btn-primary, .btn-secondary, .btn-warning, .btn-action {
  border-radius: 7px;
  padding: 7px 11px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  transition: all 0.15s;
}

.full-width { width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, #00a86b, #059669);
  color: #fff;
  border-color: #10b981;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

.btn-warning {
  background: rgba(196, 30, 58, 0.18);
  color: #fca5a5;
  border-color: rgba(248, 113, 113, 0.4);
}

.btn-warning.jammed {
  background: linear-gradient(135deg, #c41e3a, #991b1b);
  color: #fff;
  box-shadow: 0 0 14px rgba(196, 30, 58, 0.6);
}

.btn-action {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
}

.btn-action.active {
  background: rgba(0, 168, 107, 0.24);
  border-color: #10b981;
  color: #6ee7b7;
}

.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  margin-top: 8px;
}

.telemetry-card {
  background: rgba(9, 13, 22, 0.55);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 7px;
  text-align: center;
}

.t-label {
  display: block;
  font-size: 0.68rem;
  color: var(--text-muted);
}

.t-val {
  font-size: 0.95rem;
  color: var(--accent-gold);
}

/* Subsystem Filter List */
.subsystem-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-top: 9px;
  max-height: 250px;
  overflow-y: auto;
}

.subsys-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 6px;
  font-size: 0.76rem;
}

.subsys-item label {
  display: flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
}

.subsys-focus-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 0.68rem;
  cursor: pointer;
}

.subsys-focus-btn:hover {
  color: var(--accent-gold);
  border-color: var(--accent-gold);
}

/* Assembly Sequencer */
.wizard-nav {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.wizard-nav .btn-primary {
  flex: 1;
}

.step-dots {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 5px;
  margin-bottom: 10px;
}

.piece-connection-box {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 9px;
  padding: 9px 10px;
  margin-bottom: 11px;
}

.piece-status-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.piece-badge {
  background: rgba(56, 189, 248, 0.2);
  border: 1px solid rgba(56, 189, 248, 0.45);
  color: #7dd3fc;
  font-size: 0.69rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 99px;
  white-space: nowrap;
}

.piece-live-label {
  font-size: 0.74rem;
  color: #f8fafc;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.piece-progress-track {
  width: 100%;
  height: 5px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 8px;
}

.piece-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8, #d4af37, #10b981);
  transition: width 0.08s linear;
}

.piece-nav-row {
  display: grid;
  grid-template-columns: 1fr 1.15fr 1fr;
  gap: 6px;
}

.step-dot {
  height: 26px;
  border-radius: 5px;
  border: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 700;
  cursor: pointer;
}

.step-dot.completed {
  background: rgba(0, 168, 107, 0.22);
  color: #6ee7b7;
  border-color: rgba(16, 185, 129, 0.4);
}

.step-dot.current {
  background: var(--accent-gold);
  color: #090d16;
  border-color: var(--accent-gold);
}

.step-card {
  background: rgba(9, 13, 22, 0.6);
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 10px;
  padding: 12px;
}

.step-card h4 {
  color: var(--accent-gold);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.step-sub {
  font-size: 0.78rem;
  color: #cbd5e1;
  margin-bottom: 10px;
  line-height: 1.4;
}

.bom-box {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 7px;
  padding: 9px 11px;
  margin-bottom: 9px;
}

.bom-box h5 {
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.bom-box ul {
  padding-left: 16px;
  font-size: 0.76rem;
  line-height: 1.45;
  color: #e2e8f0;
}

.clearance-box {
  background: rgba(0, 168, 107, 0.13);
  border-left: 3px solid var(--accent-emerald);
  padding: 8px 10px;
  border-radius: 5px;
  font-size: 0.75rem;
}

.clearance-box strong {
  color: #34d399;
  display: block;
  margin-bottom: 2px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.76rem;
  color: var(--text-muted);
  cursor: pointer;
}

/* Plate Selector & Pause Slicer */
.helper-text {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 10px;
}

.plate-btn-list, .pause-preset-grid, .download-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.plate-select-btn, .btn-pause-preset, .dl-link {
  text-align: left;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: all 0.15s;
}

.plate-select-btn:hover, .btn-pause-preset:hover, .dl-link:hover {
  border-color: var(--accent-gold);
  background: rgba(212, 175, 55, 0.12);
}

.plate-select-btn.active {
  background: rgba(0, 168, 107, 0.22);
  border-color: #10b981;
}

.btn-pause-preset span, .dl-link span {
  font-size: 0.71rem;
  color: var(--text-muted);
}

.dl-link.primary {
  border-color: rgba(212, 175, 55, 0.5);
  background: rgba(212, 175, 55, 0.12);
}

/* 3D Viewport */
.viewport-container {
  flex: 1;
  min-height: 0;
  min-width: 0;
  position: relative;
  background: radial-gradient(circle at 50% 35%, #17223b 0%, #090d16 80%);
}

#three-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.mobile-drawer-bar {
  display: none;
}

.toolhead-legend {
  position: absolute;
  top: 14px;
  left: 14px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  pointer-events: none;
}

.th-chip {
  background: rgba(12, 18, 30, 0.85);
  border: 1px solid var(--border-subtle);
  padding: 5px 10px;
  border-radius: 99px;
  font-size: 0.73rem;
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(6px);
}

.swatch {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  display: inline-block;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.part-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(9, 13, 22, 0.92);
  border: 1px solid var(--accent-gold);
  color: #fff;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.76rem;
  z-index: 30;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
}

.part-tooltip.hidden {
  display: none;
}

/* Interactive "Newton's Apple" Wireless Remote HUD */
.remote-hud {
  position: absolute;
  right: 18px;
  bottom: 18px;
  width: 310px;
  background: linear-gradient(160deg, rgba(140, 22, 42, 0.92) 0%, rgba(45, 16, 26, 0.95) 100%);
  border: 2px solid var(--accent-gold);
  border-radius: 22px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  overflow: hidden;
  z-index: 25;
}

.remote-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 14px;
  background: rgba(0, 0, 0, 0.28);
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
}

.remote-header strong {
  display: block;
  font-size: 0.78rem;
  color: #fde68a;
}

.remote-header span {
  font-size: 0.66rem;
  color: #fecdd3;
}

#btn-minimize-remote {
  background: rgba(255, 255, 255, 0.12);
  border: none;
  color: #fff;
  width: 22px;
  height: 22px;
  border-radius: 5px;
  cursor: pointer;
}

.remote-body {
  padding: 12px 14px;
}

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

.joysticks-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.stick-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.stick-zone {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, #1e293b 0%, #090d16 100%);
  border: 2px solid var(--accent-gold);
  position: relative;
  cursor: grab;
  touch-action: none;
  box-shadow: inset 0 4px 12px rgba(0, 0, 0, 0.8);
}

.stick-crosshair-h, .stick-crosshair-v {
  position: absolute;
  background: rgba(212, 175, 55, 0.18);
}

.stick-crosshair-h {
  top: 50%;
  left: 10%;
  right: 10%;
  height: 1px;
}

.stick-crosshair-v {
  left: 50%;
  top: 10%;
  bottom: 10%;
  width: 1px;
}

.stick-knob {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fde047, #b45309);
  border: 2px solid #fff;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.6);
  pointer-events: none;
}

.stick-caption {
  font-size: 0.66rem;
  text-align: center;
  color: #ffe4e6;
  line-height: 1.25;
}

.remote-lower-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.hud-push-btn, .hud-rocker-btn {
  background: rgba(9, 13, 22, 0.65);
  border: 1px solid rgba(212, 175, 55, 0.55);
  border-radius: 10px;
  padding: 7px;
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.hud-push-btn:active {
  transform: scale(0.96);
}

.btn-cap {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #f87171, #dc2626);
  border: 2px solid #fca5a5;
}

.rocker-switch {
  background: var(--accent-emerald);
  color: #090d16;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.66rem;
  font-weight: 800;
}

/* =========================================================================
   Responsive Tablet & Mobile Layout (<= 1120px and <= 900px)
   ========================================================================= */
@media (max-width: 1120px) {
  .top-bar {
    height: auto;
    flex-wrap: wrap;
    padding: 8px 12px;
    gap: 8px;
  }

  .brand .subtitle {
    display: none;
  }

  .mode-tabs {
    order: 3;
    width: 100%;
    justify-content: stretch;
  }

  .mode-tab {
    flex: 1;
    justify-content: center;
    padding: 7px 8px;
    font-size: 0.76rem;
    text-align: center;
  }
}

@media (max-width: 900px) {
  .top-bar {
    padding: 6px 10px;
    gap: 6px;
  }

  .brand {
    gap: 8px;
  }

  .brand-badge {
    font-size: 0.64rem;
    padding: 3px 6px;
  }

  .brand h1 {
    font-size: 0.9rem;
  }

  .quick-actions {
    width: 100%;
    order: 2;
    overflow-x: auto;
    padding-bottom: 2px;
    gap: 6px;
    scrollbar-width: none;
  }

  .quick-actions::-webkit-scrollbar {
    display: none;
  }

  .toggle-pill,
  #btn-reset-cam {
    flex-shrink: 0;
    font-size: 0.72rem;
    padding: 5px 9px;
  }

  .mode-tab {
    font-size: 0.72rem;
    padding: 6px 6px;
    gap: 5px;
  }

  /* Stack 3D Viewport on top, Collapsible Bottom-Sheet Controls below */
  .workspace {
    flex-direction: column-reverse;
  }

  .viewport-container {
    flex: 1;
    min-height: 200px;
  }

  .side-panel {
    width: 100%;
    min-width: 0;
    max-height: 46dvh;
    border-right: none;
    border-top: 1px solid rgba(212, 175, 55, 0.35);
    padding: 0 10px 14px;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.55);
    transition: max-height 0.25s ease, padding 0.25s ease;
  }

  .side-panel.minimized {
    max-height: 40px;
    overflow: hidden;
    padding-bottom: 0;
  }

  .mobile-drawer-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    position: sticky;
    top: 0;
    z-index: 15;
    width: calc(100% + 20px);
    margin: 0 -10px 8px;
    padding: 6px 12px;
    background: rgba(12, 18, 30, 0.98);
    border: none;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--accent-gold);
    font-size: 0.74rem;
    font-weight: 700;
    cursor: pointer;
  }

  .drawer-pill-handle {
    width: 36px;
    height: 4px;
    border-radius: 99px;
    background: rgba(212, 175, 55, 0.55);
  }

  .toolhead-legend {
    top: 8px;
    left: 8px;
    right: 8px;
    gap: 5px;
  }

  .th-chip {
    font-size: 0.65rem;
    padding: 3px 7px;
    gap: 4px;
  }

  .swatch {
    width: 9px;
    height: 9px;
  }

  /* Touch-friendly range sliders & buttons */
  input[type="range"] {
    height: 28px;
  }

  .seg-btn,
  .btn-primary,
  .btn-secondary,
  .btn-action {
    min-height: 36px;
  }

  .part-tooltip {
    left: 10px !important;
    right: 10px !important;
    bottom: 10px !important;
    top: auto !important;
    text-align: center;
    font-size: 0.74rem;
  }

  .loader-card {
    margin: 0 16px;
    padding: 24px 20px;
  }
}

@media (max-width: 520px) {
  .mode-tab {
    font-size: 0.68rem;
    padding: 6px 4px;
  }

  .tab-num {
    width: 16px;
    height: 16px;
    font-size: 0.64rem;
  }

  .th-chip {
    font-size: 0.6rem;
    padding: 2px 6px;
  }
}