:root {
  /* Color Palette - Cybernetic/High-Tech Dark Theme */
  --bg-deep: #080a0c;
  --bg-card: #12161b;
  --bg-input: #1a1f26;
  --border-dim: #2d343c;
  --accent-cyan: #00f2ff;
  --accent-green: #39ff14;
  --accent-red: #ff3e3e;
  --text-main: #e0e6ed;
  --text-dim: #94a3b8;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 64px;

  /* Typography */
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-deep);
  color: var(--text-main);
  font-family: var(--font-display);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Layout */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

.sidebar {
  width: 260px;
  background-color: var(--bg-deep);
  border-right: 1px solid var(--border-dim);
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  flex-shrink: 0;
}

.main-view {
  flex-grow: 1;
  overflow-y: auto;
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* Sidebar Components */
.logo {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2xl);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-group {
  margin-bottom: var(--space-2xl);
}

.nav-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: var(--space-md);
  display: block;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  margin: 0 -var(--space-md);
  color: var(--text-dim);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.nav-item:hover {
  background: rgba(255,255,255,0.03);
  color: var(--text-main);
}

.nav-item.active {
  background: rgba(0, 242, 255, 0.1);
  color: var(--accent-cyan);
}

/* Cards & UI Elements */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: 12px;
  padding: var(--space-lg);
  overflow: hidden;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge {
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-live {
  background: rgba(255, 62, 62, 0.15);
  color: var(--accent-red);
  border: 1px solid var(--accent-red);
}

.badge-connected {
  background: rgba(57, 255, 20, 0.15);
  color: var(--accent-green);
  border: 1px solid var(--accent-green);
}

/* Visualization Placeholders */
.viz-container {
  width: 100%;
  height: 400px;
  background: #0d1117;
  border: 1px solid var(--border-dim);
  border-radius: 8px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.heatmap-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 40% 40%, rgba(57, 255, 20, 0.4) 0%, transparent 40%),
              radial-gradient(circle at 60% 55%, rgba(0, 242, 255, 0.3) 0%, transparent 35%),
              radial-gradient(circle at 30% 70%, rgba(255, 62, 62, 0.2) 0%, transparent 30%);
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(var(--border-dim) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-dim) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.2;
}

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  text-align: left;
  padding: var(--space-md);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-dim);
}

.data-table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--border-dim);
  font-size: 0.9rem;
}

.data-table tr:hover td {
  background: rgba(255,255,255,0.02);
}

/* Eye Tracking Specific UI */
.crosshair {
  position: absolute;
  width: 40px;
  height: 40px;
  border: 2px solid var(--accent-cyan);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.crosshair::before, .crosshair::after {
  content: '';
  position: absolute;
  background: var(--accent-cyan);
}

.crosshair::before { width: 100%; height: 1px; }
.crosshair::after { height: 100%; width: 1px; }

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.9rem;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-deep);
}

.btn-primary:hover {
  background: #00d8e4;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-dim);
  color: var(--text-main);
}

.btn-outline:hover {
  border-color: var(--text-dim);
  background: rgba(255,255,255,0.05);
}

/* Animations */
@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

.pulse {
  animation: pulse 2s infinite ease-in-out;
}