*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--color-background);
  font-family: var(--font-body);
  color: var(--color-on-surface);
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}
input, textarea {
  user-select: text;
  -webkit-user-select: text;
  -webkit-touch-callout: default;
}

.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
}

#lab-root {
  position: fixed;
  inset: 0;
  display: flex;
  z-index: 900000;
  font-family: var(--font-body);
  color: var(--color-on-surface);
}

.lab-luminous {
  box-shadow: var(--shadow-glass);
}

/* ---------- Sidebar ---------- */
.lab-sidebar {
  width: 220px;
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-3);
  gap: var(--space-1);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--glass-border);
}

.lab-sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-1) var(--space-5);
}
.lab-back-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-secondary);
  padding: var(--space-1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: var(--transition-base);
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
}
.lab-back-btn:hover { background: var(--color-hover); }
.lab-back-btn:focus-visible { 
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}
.lab-back-btn .material-symbols-outlined { font-size: 20px; }
.lab-sidebar-title { 
  font-size: var(--text-sm); 
  font-weight: var(--font-semibold);
  font-family: var(--font-heading);
}
.lab-sidebar-sub { 
  font-size: var(--text-xs); 
  color: var(--color-muted); 
  font-family: var(--font-ui); 
}

.lab-tab {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-on-surface-variant);
  opacity: 0.75;
  border-left: 4px solid transparent;
  transition: var(--transition-base);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  min-height: var(--touch-target-min);
}
.lab-tab:hover { 
  opacity: 1; 
  background: rgba(255,255,255,0.3); 
}
.lab-tab:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}
.lab-tab.lab-tab-active {
  opacity: 1;
  color: var(--color-secondary);
  background: var(--color-active);
  border-left-color: var(--color-secondary);
}
.lab-tab .material-symbols-outlined { font-size: 20px; }

/* ---------- Main ---------- */
.lab-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  min-width: 0;
}

/* ---------- Viewport ---------- */
#lab-viewport {
  flex: 1;
  border-radius: var(--radius-2xl);
  min-height: 0;
  overflow: hidden;
  background: var(--color-secondary);
  position: relative;
}

#lab-viewport canvas#kl-arCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 5;
  pointer-events: none;
}

#lab-viewportLabel {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 6;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(6px);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  color: var(--color-on-primary);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  pointer-events: none;
}
#lab-viewportLabel .lab-dot { 
  width: 8px; 
  height: 8px; 
  border-radius: 50%; 
  background: var(--color-error); 
}
#lab-viewportLabel.lab-tracking .lab-dot { 
  background: var(--color-primary); 
  box-shadow: 0 0 8px var(--color-primary); 
}

#lab-viewportHint {
  position: absolute;
  z-index: 6;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  color: var(--color-primary-light);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
  pointer-events: none;
  transition: opacity var(--duration-slow);
}
#lab-viewportHint .lab-ring {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 1px dashed var(--color-primary-light);
  animation: lab-spin 10s linear infinite;
}
@keyframes lab-spin { to { transform: rotate(360deg); } }

#lab-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  cursor: none;
  touch-action: none;
}

#lab-bench[aria-expanded="true"]::before {
  content: 'MENU CHẤT + DỤNG CỤ';
  position: absolute;
  top: 14px;
  left: 50%;
  z-index: 100002;
  transform: translateX(-50%);
  padding: 7px 12px;
  border: 1px solid rgba(127,149,255,.45);
  border-radius: 999px;
  background: rgba(16,40,77,.88);
  color: #dde1ff;
  font: 600 11px "Space Grotesk", sans-serif;
  letter-spacing: .08em;
  pointer-events: none;
}

@media (max-width: 680px) {
  #lab-bench[aria-expanded="true"]::before { top: 8px; font-size: 9px; }
}

/* ---------- Calibration ---------- */
#lab-calibration {
  position: fixed;
  z-index: 950000;
  right: 24px;
  bottom: 24px;
  top: 96px;
  width: 340px;
  display: none;
  flex-direction: column;
  gap: 18px;
  overflow: auto;
  padding: 20px;
  border-radius: 1rem;
  background: rgba(16, 40, 77, 0.94);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(127, 149, 255, 0.25);
  color: #dde1ff;
}
#lab-calibration.lab-open { display: flex; }
#lab-calibration p { font-size: 12px; line-height: 1.5; color: #b1c7f5; margin: 0 0 4px; }
#lab-calibration label {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: #b1c7f5;
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}
#lab-calibration input[type="range"] { width: 100%; accent-color: #7f95ff; }
.lab-field { margin-bottom: 4px; }
.lab-panel-divider { height: 1px; background: rgba(127,149,255,0.2); }
.lab-gaze-state {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(127,149,255,0.12);
  color: #dde1ff;
  font-size: 12px;
  line-height: 1.4;
}
.lab-gaze-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
.lab-panel-btn, .lab-cancel-calibration {
  min-height: 44px;
  border: 1px solid #7f95ff;
  border-radius: 8px;
  background: #7f95ff;
  color: #10284d;
  font: 600 12px 'Space Grotesk', sans-serif;
  cursor: pointer;
  transition: opacity 200ms ease, transform 200ms ease;
}
.lab-panel-btn:hover, .lab-cancel-calibration:hover { transform: translateY(-1px); }
.lab-panel-btn:focus-visible, .lab-cancel-calibration:focus-visible, .lab-stop-tracking:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}
.lab-panel-btn:disabled { cursor: not-allowed; opacity: 0.45; transform: none; }
.lab-panel-btn-secondary { background: transparent; color: #dde1ff; }

.lab-gaze-calibration {
  position: fixed;
  inset: 0;
  z-index: 980000;
  display: none;
  background: rgba(8,20,40,0.9);
  cursor: none;
}
.lab-gaze-calibration.lab-open { display: block; }
.lab-gaze-target {
  position: absolute;
  width: 34px;
  height: 34px;
  border: 3px solid #ffffff;
  border-radius: 50%;
  background: #7f95ff;
  box-shadow: inset 0 0 0 8px #213145;
  transform: translate(-50%, -50%);
}
.lab-gaze-instruction {
  position: absolute;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: #ffffff;
  font: 600 14px 'Space Grotesk', sans-serif;
  white-space: nowrap;
}
.lab-cancel-calibration { position: absolute; right: 24px; bottom: 24px; padding: 0 22px; }
.lab-stop-tracking {
  position: fixed;
  right: 24px;
  top: 24px;
  z-index: 960000;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 10px;
  background: #213145;
  color: #ffffff;
  font: 600 12px 'Space Grotesk', sans-serif;
  cursor: pointer;
}
.lab-stop-tracking[hidden] { display: none; }
.lab-stop-tracking .material-symbols-outlined { font-size: 19px; }

/* ---------- About ---------- */
#lab-about {
  position: fixed;
  z-index: 950000;
  right: 24px;
  bottom: 24px;
  top: 96px;
  width: 380px;
  display: none;
  flex-direction: column;
  gap: 16px;
  overflow: auto;
  padding: 24px;
  border-radius: 1rem;
  background: rgba(16, 40, 77, 0.94);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(127, 149, 255, 0.25);
  color: #dde1ff;
}
#lab-about.lab-open { display: flex; }
#lab-about h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 16px;
  margin: 0;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}
#lab-about p { font-size: 13px; line-height: 1.6; color: #b1c7f5; margin: 0; }
.lab-about-section {
  border-top: 1px solid rgba(127,149,255,0.2);
  padding-top: 12px;
}
.lab-about-section h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  margin: 0 0 8px;
  color: #7f95ff;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
#lab-about ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 12px;
  line-height: 1.8;
  color: #b1c7f5;
}
#lab-about ul li { padding-left: 16px; position: relative; }
#lab-about ul li::before {
  content: '›';
  position: absolute;
  left: 4px;
  color: #7f95ff;
}

/* ---------- Console ---------- */
.lab-console {
  height: 120px;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 24px;
  background: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0px 20px 40px rgba(127, 149, 255, 0.15);
}
.lab-console-info {
  width: 200px;
  border-right: 1px solid rgba(0,0,0,0.08);
  height: 70%;
  padding-right: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.lab-console-title { font-size: 13px; font-weight: 600; }
.lab-console-desc { font-size: 11px; color: #444653; margin-bottom: 8px; }
.lab-console-stats {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  display: flex;
  gap: 10px;
  color: #444653;
}
.lab-console-box {
  flex: 1;
  background: #213145;
  height: 100%;
  border-radius: 0.5rem;
  padding: 10px 14px;
  overflow: hidden;
}
#lab-console {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 11px;
  color: #b1c7f5;
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  overflow-y: auto;
  height: 100%;
}
#lab-console .lab-line span { color: #3cd7ff; margin-right: 6px; }

/* ---------- Chế độ thí nghiệm (Classic / AR) ---------- */
.lab-mode-badge {
  margin: 0 6px 12px;
  padding: 7px 10px;
  border-radius: 999px;
  border: 1px solid rgba(127,149,255,0.4);
  background: rgba(127,149,255,0.14);
  color: #dde1ff;
  font: 700 10px 'Space Grotesk', sans-serif;
  letter-spacing: 0.14em;
  cursor: pointer;
  text-align: center;
  transition: transform 200ms ease, opacity 200ms ease;
}
.lab-mode-badge:hover { transform: translateY(-1px); opacity: 0.9; }
.lab-mode-badge:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}
.lab-mode-badge--ar {
  background: #7f95ff;
  border-color: #7f95ff;
  color: #0b1b3a;
}

.lab-mode-chip {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 100001;
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(127,149,255,0.45);
  background: rgba(16,40,77,0.9);
  color: #dde1ff;
  font: 700 10px 'Space Grotesk', sans-serif;
  letter-spacing: 0.12em;
  cursor: pointer;
}
.lab-mode-chip[hidden] { display: none; }

.lab-mode-picker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: min(520px, 92%);
  padding: 26px 24px;
  border-radius: 22px;
  background: rgba(16,40,77,0.92);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(127,149,255,0.3);
  box-shadow: 0 24px 70px rgba(7,24,52,0.45);
}
.lab-mode-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #eaf1ff;
  font: 600 16px 'Space Grotesk', sans-serif;
}
.lab-mode-title .material-symbols-outlined { color: #7f95ff; font-size: 20px; }
.lab-mode-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}
.lab-mode-actions .lab-start-btn {
  flex: 1 1 auto;
  min-width: 220px;
  justify-content: center;
  padding: 16px 22px;
  font-size: 14px;
}
.lab-start-btn--classic {
  background: linear-gradient(90deg, #2a3657, #1b2440);
  box-shadow: 0 0 22px rgba(42,54,87,0.55);
}
.lab-mode-hint {
  margin: 0;
  max-width: 440px;
  font-size: 12px;
  line-height: 1.6;
  color: #b1c7f5;
  text-align: center;
}
.lab-hint-link {
  color: #7f95ff;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.lab-hint-link:hover { color: #aab9ff; }

.lab-mode-soon {
  display: inline-block;
  margin-left: 8px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(255,183,77,0.55);
  background: rgba(255,183,77,0.16);
  color: #ffd9a0;
  font: 700 10px 'Space Grotesk', sans-serif;
  letter-spacing: 0.08em;
  white-space: nowrap;
  vertical-align: middle;
}
.lab-mode-soon--lg {
  font-size: 11px;
  margin-left: 10px;
  padding: 4px 12px;
}
.lab-start-btn { flex-wrap: wrap; }
.lab-start-btn .lab-mode-soon { margin-left: 0; width: 100%; }

/* ---------- Đăng ký gói thành viên (AR đang phát triển) ---------- */
.lab-membership { z-index: 100010; }
.lab-membership[hidden] { display: none; }
.lab-membership-form {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}
.lab-membership-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.lab-membership-row input[type="email"] {
  flex: 1 1 200px;
  min-width: 0;
  min-height: 46px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid rgba(127,149,255,0.35);
  background: rgba(10,26,52,0.9);
  color: #eaf1ff;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  outline: none;
  user-select: text;
  -webkit-user-select: text;
}
.lab-membership-row input[type="email"]:focus {
  border-color: #7f95ff;
  box-shadow: 0 0 0 3px rgba(127,149,255,0.2);
}
.lab-membership-row .lab-start-btn {
  flex: 0 1 auto;
  min-width: 0;
  padding: 0 18px;
  font-size: 13px;
}
.lab-membership-msg {
  min-height: 18px;
  font-size: 12.5px;
  line-height: 1.5;
}
.lab-membership-msg--ok { color: #7ee2a8; }
.lab-membership-msg--error { color: #ff9d9d; }
.lab-panel-btn-secondary {
  background: transparent;
  border: 1px solid rgba(127,149,255,0.35);
  color: #b1c7f5;
}

/* ---------- Start overlay ---------- */
.lab-start-overlay {
  position: absolute;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(16, 40, 77, 0.6);
  backdrop-filter: blur(4px);
  transition: opacity 0.5s;
}
.lab-start-overlay.lab-hidden {
  opacity: 0;
  pointer-events: none;
}
.lab-start-btn {
  background: linear-gradient(90deg, #3f56bc, #233ca3);
  color: #fff;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  padding: 18px 36px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  border: none;
  box-shadow: 0 0 25px rgba(63, 86, 188, 0.5);
  transition: all 0.3s ease;
}
.lab-start-btn:hover {
  box-shadow: 0 0 35px rgba(63, 86, 188, 0.8);
  transform: translateY(-2px);
}

/* ---------- Toast ---------- */
#lab-toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%) translateY(20px);
  background: #213145;
  color: #eaf1ff;
  padding: 10px 18px;
  border-radius: 999px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 12px;
  z-index: 970000;
  opacity: 0;
  transition: all 0.3s;
  pointer-events: none;
}
#lab-toast.lab-show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .lab-sidebar { width: 64px; padding: 12px 6px; gap: 2px; }
  .lab-sidebar-title, .lab-sidebar-sub { display: none; }
  .lab-sidebar-header { padding: 8px 0 12px; justify-content: center; gap: 0; }
  .lab-sidebar-header img { display: none; }
  .lab-mode-badge { display: none; }
  .lab-tab {
    flex-direction: column;
    gap: 3px;
    padding: 8px 2px;
    font-size: 9px;
    text-align: center;
    line-height: 1.15;
  }
  .lab-tab span:last-child { display: block; }
  .lab-tab .material-symbols-outlined { font-size: 19px; }
  .lab-main { padding: 10px; gap: 10px; }
  .lab-console { flex-direction: column; height: auto; padding: 12px; gap: 10px; }
  .lab-console-info { width: 100%; border-right: none; border-bottom: 1px solid rgba(0,0,0,0.08); height: auto; padding: 0 0 10px; }
  .lab-console-box { height: 64px; width: 100%; }
  #lab-calibration, #lab-about { right: 10px; left: 74px; width: auto; top: 74px; bottom: 10px; }
  .lab-gaze-actions { grid-template-columns: 1fr; }
  .lab-stop-tracking { right: 10px; top: 10px; }
  .lab-stop-tracking span:last-child { display: none; }
  .lab-mode-actions { flex-direction: column; }
  .lab-mode-actions .lab-start-btn { width: 100%; min-width: 0; font-size: 13px; padding: 15px 16px; }
  .lab-mode-picker { padding: 22px 16px; }
  .lab-mode-title { font-size: 14px; }
  .lab-node { font-size: 13px !important; }
  #lab-resetBench { top: 8px; padding: 8px 10px; font-size: 11px; }
  #lab-resetBench .material-symbols-outlined { font-size: 14px !important; }
  #lab-viewportLabel { top: 12px; left: 12px; padding: 6px 10px; font-size: 9px; }
  #lab-viewportHint .lab-ring { width: 96px; height: 96px; }
  #lab-viewportHint span { font-size: 26px; }
  #lab-viewportHint div[style*="margin-top"] { margin-top: -64px !important; }
}

@media (max-width: 420px) {
  .lab-tab span:last-child { display: none; }
  .lab-tab { justify-content: center; padding: 12px 0; font-size: 0; }
  .lab-tab .material-symbols-outlined { font-size: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  #lab-viewportHint .lab-ring { animation: none; }
  .lab-panel-btn, .lab-cancel-calibration, .lab-stop-tracking { transition: none; }
}