:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0f1419;
  --color-bg-secondary: #1a1f2e;
  --color-bg-tertiary: #242d3d;
  --color-bg-card: #1e2736;
  --color-bg-input: #1a2332;
  --color-bg-hover: #2a3444;

  /* Brand Colors */
  --color-primary: #1d8bf3;
  --color-primary-hover: #1a7cd6;
  --color-primary-light: rgba(29, 139, 243, 0.15);

  /* Accent Colors */
  --color-accent: #fbbf24;
  --color-accent-light: rgba(251, 191, 36, 0.15);

  /* Status Colors */
  --color-success: #22c55e;
  --color-success-light: rgba(34, 197, 94, 0.15);
  --color-warning: #f59e0b;
  --color-warning-light: rgba(245, 158, 11, 0.15);
  --color-error: #ef4444;
  --color-error-light: rgba(239, 68, 68, 0.15);
  --color-info: #3b82f6;
  --color-info-light: rgba(59, 130, 246, 0.15);

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #9ca3af;
  --color-text-tertiary: #6b7280;
  --color-text-muted: #4b5563;

  /* Border Colors */
  --color-border: #2d3748;
  --color-border-light: #374151;

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

  /* Glassmorphism */
  --glass-bg: rgba(30, 39, 54, 0.8);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(12px);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-toast: 600;

  /* Layout */
  --header-height: 60px;
  --bottom-nav-height: 70px;
  --max-width: 480px;
  --sidebar-width: 280px;
}

/* Desktop overrides */
@media (min-width: 768px) {
  :root {
    --max-width: 1200px;
    --header-height: 70px;
  }
}