:root {
  /* Aviation-inspired dark theme */
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-card: #334155;
  --color-bg-input: #1e293b;
  --color-bg-modal: rgba(0, 0, 0, 0.7);
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #475569;
  --color-accent: #0ea5e9;
  --color-accent-hover: #38bdf8;
  --color-accent-dark: #0284c7;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-success: #22c55e;
  --color-warning: #f59e0b;

  /* Status colors */
  --color-keyed: #22c55e;
  --color-keyed-bg: rgba(34, 197, 94, 0.15);
  --color-activated: #3b82f6;
  --color-activated-bg: rgba(59, 130, 246, 0.15);
  --color-overdue: #ef4444;
  --color-overdue-bg: rgba(239, 68, 68, 0.15);
  --color-closed: #6b7280;
  --color-closed-bg: rgba(107, 114, 128, 0.15);
  --color-not-flown: #f59e0b;
  --color-not-flown-bg: rgba(245, 158, 11, 0.15);

  /* Layout */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);

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

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}