/* ═══════════════════════════════════════════════════════════════════════════
   AI EDUCATIONAL LABS — Design System
   © 2026 AI Educational Labs / HeadySystems Inc.
   University-Grade Interactive Lab Platform
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── CSS Custom Properties ──────────────────────────────────────────────── */
:root {
  /* Brand Palette */
  --primary: #6C63FF;
  --primary-light: #8B83FF;
  --primary-dark: #4A42D4;
  --secondary: #00D9A3;
  --secondary-light: #33E4B8;
  --accent: #FF6B9D;
  --accent-light: #FF8DB5;

  /* Backgrounds */
  --bg-deep: #0A0E1A;
  --bg-surface: #111827;
  --bg-card: #1F2937;
  --bg-elevated: #283548;
  --bg-glass: rgba(31, 41, 55, 0.65);
  --bg-glass-hover: rgba(31, 41, 55, 0.85);

  /* Text */
  --text-primary: #F9FAFB;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;

  /* Status */
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --info: #3B82F6;

  /* Lab Discipline Colors */
  --lab-earth: #8B5CF6;
  --lab-bio: #10B981;
  --lab-chem: #F59E0B;
  --lab-physics: #3B82F6;
  --lab-cs: #EC4899;
  --lab-eng: #F97316;
  --lab-wetchem: #06B6D4;
  --lab-micro: #8B5CF6;
  --lab-enviro: #22C55E;
  --lab-anatomy: #E11D48;

  /* Spacing (φ-scaled) */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 13px;
  --sp-lg: 21px;
  --sp-xl: 34px;
  --sp-2xl: 55px;
  --sp-3xl: 89px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.15);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.25);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 30px rgba(108,99,255,0.25);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* ─── High Contrast Mode ─────────────────────────────────────────────────── */
@media (prefers-contrast: high) {
  :root {
    --bg-deep: #000000;
    --bg-surface: #111111;
    --bg-card: #222222;
    --text-primary: #FFFFFF;
    --text-secondary: #CCCCCC;
    --primary: #8B83FF;
  }
}

/* ─── Reduced Motion ─────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.618;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Focus Indicators (Accessibility) ───────────────────────────────────── */
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; top: -100px; left: 50%;
  transform: translateX(-50%);
  background: var(--primary); color: #fff;
  padding: var(--sp-sm) var(--sp-lg);
  border-radius: var(--radius-md);
  z-index: 10000; font-weight: 600;
  transition: top var(--duration-fast) var(--ease-out);
}
.skip-link:focus { top: var(--sp-md); }

/* ─── Animated Background ────────────────────────────────────────────────── */
.bg-mesh {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(108,99,255,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0,217,163,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(255,107,157,0.05) 0%, transparent 50%);
}

/* ─── Layout ─────────────────────────────────────────────────────────────── */
.app-container {
  position: relative; z-index: 1;
  min-height: 100vh;
  display: flex; flex-direction: column;
}

.main-content {
  flex: 1;
  padding: var(--sp-lg);
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* ─── Header / Navbar ────────────────────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-md) var(--sp-xl);
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.navbar-brand {
  display: flex; align-items: center; gap: var(--sp-sm);
  font-size: 1.25rem; font-weight: 700; color: var(--text-primary);
  text-decoration: none;
}
.navbar-brand .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  font-size: 1.1rem;
}

.navbar-nav {
  display: flex; align-items: center; gap: var(--sp-sm);
  list-style: none;
}
.navbar-nav a, .navbar-nav button {
  display: flex; align-items: center; gap: 6px;
  padding: var(--sp-sm) var(--sp-md);
  color: var(--text-secondary);
  text-decoration: none; font-size: 0.9rem; font-weight: 500;
  border-radius: var(--radius-sm);
  border: none; background: none; cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.navbar-nav a:hover, .navbar-nav button:hover,
.navbar-nav a.active, .navbar-nav button.active {
  color: var(--text-primary);
  background: rgba(108,99,255,0.12);
}

.hamburger {
  display: none;
  background: none; border: none; color: var(--text-primary);
  font-size: 1.5rem; cursor: pointer; padding: var(--sp-sm);
}

/* ─── Glassmorphism Cards ────────────────────────────────────────────────── */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--sp-xl);
  transition: all var(--duration-normal) var(--ease-out);
}
.glass-card:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(108,99,255,0.25);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

/* ─── Lab Cards ──────────────────────────────────────────────────────────── */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--sp-xl);
  margin-top: var(--sp-xl);
}

.lab-card {
  position: relative; overflow: hidden;
  cursor: pointer;
}
.lab-card .lab-icon {
  width: 64px; height: 64px;
  border-radius: var(--radius-md);
  display: grid; place-items: center;
  font-size: 1.8rem;
  margin-bottom: var(--sp-md);
  transition: transform var(--duration-normal) var(--ease-out);
}
.lab-card:hover .lab-icon { transform: scale(1.1) rotate(-5deg); }

.lab-card[data-discipline="earth"] .lab-icon { background: linear-gradient(135deg, var(--lab-earth), #A78BFA); }
.lab-card[data-discipline="biology"] .lab-icon { background: linear-gradient(135deg, var(--lab-bio), #34D399); }
.lab-card[data-discipline="chemistry"] .lab-icon { background: linear-gradient(135deg, var(--lab-chem), #FBBF24); }
.lab-card[data-discipline="physics"] .lab-icon { background: linear-gradient(135deg, var(--lab-physics), #60A5FA); }
.lab-card[data-discipline="cs"] .lab-icon { background: linear-gradient(135deg, var(--lab-cs), #F472B6); }
.lab-card[data-discipline="engineering"] .lab-icon { background: linear-gradient(135deg, var(--lab-eng), #FB923C); }
.lab-card[data-discipline="wetchem"] .lab-icon { background: linear-gradient(135deg, var(--lab-wetchem), #22D3EE); }
.lab-card[data-discipline="micro"] .lab-icon { background: linear-gradient(135deg, var(--lab-micro), #A78BFA); }
.lab-card[data-discipline="enviro"] .lab-icon { background: linear-gradient(135deg, var(--lab-enviro), #4ADE80); }
.lab-card[data-discipline="anatomy"] .lab-icon { background: linear-gradient(135deg, var(--lab-anatomy), #FB7185); }

.lab-card .lab-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 6px; }
.lab-card .lab-desc { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.5; }
.lab-card .lab-meta {
  display: flex; gap: var(--sp-sm); margin-top: var(--sp-md);
  flex-wrap: wrap;
}
.lab-badge {
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem; font-weight: 600;
  background: rgba(108,99,255,0.15);
  color: var(--primary-light);
}
.lab-badge.vr { background: rgba(0,217,163,0.15); color: var(--secondary); }
.lab-badge.voice { background: rgba(255,107,157,0.15); color: var(--accent); }

/* ─── Lab Workspace ──────────────────────────────────────────────────────── */
.lab-workspace {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--sp-xl);
  min-height: 70vh;
}
.lab-canvas-container {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
  display: flex; flex-direction: column;
}
.lab-canvas-container canvas {
  width: 100%; flex: 1;
  background: #0D1117;
}
.lab-toolbar {
  display: flex; gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  background: rgba(0,0,0,0.3);
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-wrap: wrap;
}
.lab-sidebar {
  display: flex; flex-direction: column; gap: var(--sp-md);
}
.sidebar-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: var(--sp-lg);
}
.sidebar-panel h3 {
  font-size: 0.85rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--sp-sm);
}

/* ─── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: var(--sp-sm) var(--sp-lg);
  border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  box-shadow: 0 0 20px rgba(108,99,255,0.4);
  transform: translateY(-1px);
}
.btn-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
  border: 1px solid rgba(255,255,255,0.1);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
}
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-icon {
  width: 38px; height: 38px; padding: 0;
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  font-size: 1.1rem;
}
.btn-sm { padding: 4px 12px; font-size: 0.8rem; }
.btn-lg { padding: var(--sp-md) var(--sp-xl); font-size: 1rem; }

/* ─── Admin Dashboard ────────────────────────────────────────────────────── */
.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-xl);
}
.stat-card {
  text-align: center;
}
.stat-card .stat-value {
  font-size: 2.5rem; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-card .stat-label {
  color: var(--text-muted); font-size: 0.85rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-top: 4px;
}

/* ─── Data Table ─────────────────────────────────────────────────────────── */
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
}
.data-table th {
  text-align: left;
  padding: var(--sp-sm) var(--sp-md);
  color: var(--text-muted);
  font-size: 0.8rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.data-table td {
  padding: var(--sp-sm) var(--sp-md);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-secondary);
}
.data-table tr:hover td { background: rgba(108,99,255,0.05); }

/* ─── Forms & Inputs ─────────────────────────────────────────────────────── */
.form-group { margin-bottom: var(--sp-lg); }
.form-group label {
  display: block;
  font-size: 0.85rem; font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: var(--sp-sm) var(--sp-md);
  background: rgba(0,0,0,0.25);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  transition: border-color var(--duration-fast) var(--ease-out);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
  outline: none;
}
.form-textarea { min-height: 100px; resize: vertical; }

/* ─── Modal ──────────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  padding: var(--sp-xl);
  opacity: 0; pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
}
.modal-overlay.active { opacity: 1; pointer-events: auto; }
.modal-content {
  background: var(--bg-surface);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: var(--sp-2xl);
  max-width: 600px; width: 100%;
  max-height: 85vh; overflow-y: auto;
  transform: translateY(20px);
  transition: transform var(--duration-normal) var(--ease-out);
}
.modal-overlay.active .modal-content { transform: translateY(0); }
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: var(--sp-xl);
}
.modal-header h2 { font-size: 1.3rem; font-weight: 700; }

/* ─── Toast Notifications ────────────────────────────────────────────────── */
.toast-container {
  position: fixed; bottom: var(--sp-xl); right: var(--sp-xl);
  z-index: 2000;
  display: flex; flex-direction: column; gap: var(--sp-sm);
}
.toast {
  padding: var(--sp-md) var(--sp-xl);
  border-radius: var(--radius-md);
  font-size: 0.9rem; font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: slideInRight var(--duration-normal) var(--ease-out);
  max-width: 360px;
}
.toast.success { background: var(--success); color: #fff; }
.toast.error { background: var(--danger); color: #fff; }
.toast.info { background: var(--info); color: #fff; }
.toast.warning { background: var(--warning); color: #000; }

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

/* ─── Progress Bar ───────────────────────────────────────────────────────── */
.progress-bar {
  height: 8px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-bar .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-out);
}

/* ─── Compliance Page ────────────────────────────────────────────────────── */
.compliance-content {
  max-width: 800px; margin: 0 auto;
  line-height: 1.8;
}
.compliance-content h1 { font-size: 2rem; margin-bottom: var(--sp-xl); }
.compliance-content h2 { font-size: 1.3rem; margin: var(--sp-xl) 0 var(--sp-md); color: var(--primary-light); }
.compliance-content p { color: var(--text-secondary); margin-bottom: var(--sp-md); }
.compliance-content ul { padding-left: var(--sp-xl); color: var(--text-secondary); }
.compliance-content ul li { margin-bottom: var(--sp-sm); }
.compliance-acceptance {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: var(--sp-xl);
  margin-top: var(--sp-xl);
  text-align: center;
}

/* ─── Hero Section ───────────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: var(--sp-3xl) var(--sp-xl);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--sp-md);
  line-height: 1.2;
}
.hero p {
  font-size: 1.15rem; color: var(--text-secondary);
  max-width: 640px; margin: 0 auto var(--sp-xl);
}
.hero-actions { display: flex; gap: var(--sp-md); justify-content: center; flex-wrap: wrap; }

/* ─── Voice/VR Controls ──────────────────────────────────────────────────── */
.voice-indicator {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem; font-weight: 600;
}
.voice-indicator.listening {
  background: rgba(239,68,68,0.15); color: var(--danger);
  animation: pulse 1.5s infinite;
}
.voice-indicator.idle {
  background: rgba(255,255,255,0.06); color: var(--text-muted);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.vr-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px;
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(0,217,163,0.2));
  border-radius: var(--radius-full);
  font-size: 0.75rem; font-weight: 700;
  color: var(--secondary);
  cursor: pointer;
}

/* ─── Auth Page ──────────────────────────────────────────────────────────── */
.auth-container {
  max-width: 420px; margin: var(--sp-3xl) auto;
}
.auth-container h2 { text-align: center; margin-bottom: var(--sp-xl); }

.divider {
  display: flex; align-items: center; gap: var(--sp-md);
  color: var(--text-muted); font-size: 0.85rem;
  margin: var(--sp-xl) 0;
}
.divider::before, .divider::after {
  content: ''; flex: 1; height: 1px;
  background: rgba(255,255,255,0.08);
}

/* ─── Profile / Progress ─────────────────────────────────────────────────── */
.profile-header {
  display: flex; align-items: center; gap: var(--sp-xl);
  margin-bottom: var(--sp-2xl);
}
.profile-avatar {
  width: 80px; height: 80px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: grid; place-items: center;
  font-size: 2rem; font-weight: 700;
  color: #fff;
}
.progress-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--sp-md);
}
.progress-item {
  padding: var(--sp-lg);
}
.progress-item .discipline-name {
  font-size: 0.85rem; font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--sp-sm);
}
.progress-item .labs-completed {
  font-size: 1.5rem; font-weight: 800;
  color: var(--text-primary);
}

/* ─── Export Panel ────────────────────────────────────────────────────────── */
.export-options {
  display: flex; gap: var(--sp-md); flex-wrap: wrap;
}

/* ─── Footer ─────────────────────────────────────────────────────────────── */
.site-footer {
  padding: var(--sp-2xl) var(--sp-xl);
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-links {
  display: flex; justify-content: center; gap: var(--sp-xl);
  margin-bottom: var(--sp-md); flex-wrap: wrap;
}
.footer-links a { color: var(--text-secondary); text-decoration: none; }
.footer-links a:hover { color: var(--text-primary); }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .lab-workspace {
    grid-template-columns: 1fr;
  }
  .lab-sidebar {
    flex-direction: row;
    overflow-x: auto;
  }
  .sidebar-panel { min-width: 260px; }
}

@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .navbar-nav.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: var(--sp-md);
  }
  .hamburger { display: block; }
  .lab-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .admin-grid { grid-template-columns: 1fr; }
  .main-content { padding: var(--sp-md); }
  .navbar { padding: var(--sp-sm) var(--sp-md); }
}

@media (max-width: 480px) {
  .hero { padding: var(--sp-xl) var(--sp-md); }
  .glass-card { padding: var(--sp-lg); }
  .lab-card .lab-icon { width: 48px; height: 48px; font-size: 1.3rem; }
}

/* ─── Print Stylesheet ───────────────────────────────────────────────────── */
@media print {
  .navbar, .site-footer, .btn, .hamburger,
  .toast-container, .modal-overlay, .bg-mesh { display: none !important; }
  body { background: #fff; color: #000; }
  .glass-card { background: #f9f9f9; border: 1px solid #ddd; box-shadow: none; }
  .main-content { max-width: 100%; }
}