:root {
  /* Primary Palette - Blue */
  --primary-50: #E3F2FD;
  --primary-100: #BBDEFB;
  --primary-200: #90CAF9;
  --primary-300: #64B5F6;
  --primary-400: #42A5F5;
  --primary-500: #2196F3;
  --primary-600: #1E88E5;
  --primary-700: #1976D2;
  --primary-800: #1565C0;
  --primary-900: #0D47A1;

  /* Secondary - Purple */
  --secondary-500: #673AB7;
  --secondary-600: #5E35B1;
  --secondary-700: #512DA8;

  /* Semantic */
  --success-500: #4CAF50;
  --danger-500: #F44336;
  --warning-500: #FF9800;
  --info-500: #2196F3;

  /* Neutrals (Dark Mode Default for Finance UX) */
  --bg-primary: #121212;
  --bg-secondary: #1E1E1E;
  --bg-tertiary: #2C2C2C;
  --text-primary: #FFFFFF;
  --text-secondary: #B3B3B3;
  --text-disabled: #666666;
  --border-color: #3A3A3A;

  /* Spacing */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-8: 32px;
  --spacing-10: 40px;
  --spacing-12: 48px;

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Roboto Mono', 'SF Mono', Monaco, Consolas, monospace;
}

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

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

/* Layout */
.app-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: 64px 1fr;
  height: 100vh;
  width: 100vw;
}

.top-nav {
  grid-column: 1 / -1;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-6);
  z-index: 100;
}

.sidebar {
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: var(--spacing-4) 0;
}

.main-content {
  overflow-y: auto;
  padding: var(--spacing-6);
  background-color: var(--bg-primary);
}

/* Navigation Elements */
.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary-500);
  text-decoration: none;
}

.search-bar {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 16px;
  width: 400px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.search-bar input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 100%;
  outline: none;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-6);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s;
  font-size: 0.875rem;
}

.nav-item:hover, .nav-item.active {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.nav-item.active {
  border-right: 3px solid var(--primary-500);
  color: var(--primary-400);
}

/* Components */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: var(--spacing-4);
  margin-bottom: var(--spacing-6);
}

.grid {
  display: grid;
  gap: var(--spacing-6);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2-1 {
  grid-template-columns: 2fr 1fr;
}

.metric-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.metric-label {
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.metric-change {
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.up { color: var(--success-500); }
.down { color: var(--danger-500); }

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

.data-table th {
  text-align: left;
  padding: var(--spacing-3);
  border-bottom: 2px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
}

.data-table td {
  padding: var(--spacing-4) var(--spacing-3);
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* Charts Placeholder */
.chart-container {
  height: 300px;
  width: 100%;
  position: relative;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 6px;
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

.btn-primary {
  background-color: var(--primary-500);
  color: white;
}

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

.btn:hover {
  opacity: 0.8;
}

/* Badge */
.badge {
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background-color: rgba(76, 175, 80, 0.1); color: var(--success-500); }
.badge-danger { background-color: rgba(244, 67, 54, 0.1); color: var(--danger-500); }

/* Responsive */
@media (max-width: 960px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: none;
  }
  .top-nav {
    padding: 0 var(--spacing-4);
  }
}