/**
 * Theme & Design System Variables
 * Sleek, modern dark engineering studio aesthetic.
 */
:root {
  /* Color Palette */
  --bg-app: #0b0f19;
  --bg-sidebar: #111827;
  --bg-surface: #1f2937;
  --bg-surface-hover: #374151;
  --bg-surface-active: #4b5563;
  --bg-input: #111827;

  --border-subtle: #1f2937;
  --border-default: #374151;
  --border-focus: #3b82f6;

  /* Accent Colors */
  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;
  --accent-primary-glow: rgba(59, 130, 246, 0.25);

  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  --accent-danger-hover: #dc2626;

  /* Typography Colors */
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  /* Canvas Variables */
  --canvas-bg: #e5e7eb;
  --schematic-paper: #ffffff;
  --grid-dot-color: #cbd5e1;

  /* Elevation / Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);

  /* Dimensions */
  --header-height: 52px;
  --sidebar-left-width: 260px;
  --sidebar-right-width: 320px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Fonts */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--bg-surface-active);
}