/* CSS Custom Properties - Black & White Design Tokens */
:root {
  /* Background Colors - Black & White */
  --bg-primary:    #000000;
  --bg-secondary:  #0a0a0a;
  --bg-card:       #111111;
  --bg-elevated:   #1a1a1a;
  --bg-hover:      #222222;
  --border:        #333333;
  --border-subtle: #1a1a1a;

  /* Text Colors - Pure White to Gray */
  --text-primary:   #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted:     #666666;
  --text-inverse:   #000000;

  /* Accent Colors - Monochrome */
  --accent-white:  #ffffff;
  --accent-gray:   #888888;
  --accent-dark:   #333333;
  --accent-darker: #1a1a1a;

  /* Status Colors - Black & White Only */
  --status-active:   #ffffff;
  --status-inactive: #444444;
  --status-border:   #ffffff;

  /* Gradients - Monochrome */
  --gradient-card:    linear-gradient(135deg, #111111 0%, #1a1a1a 100%);
  --gradient-white:   linear-gradient(135deg, #ffffff 0%, #e0e0e0 100%);
  --gradient-gray:    linear-gradient(135deg, #333333 0%, #1a1a1a 100%);

  /* Shadows */
  --shadow-card:      0 4px 24px rgba(255,255,255,0.05);
  --shadow-elevated:  0 8px 40px rgba(255,255,255,0.08);
  --shadow-glow:      0 0 20px rgba(255,255,255,0.15);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Spacing Scale (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Typography Scale */
  --text-xs:   0.75rem;   /* 12px */
  --text-sm:   0.875rem;  /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-lg:   1.125rem;  /* 18px */
  --text-xl:   1.25rem;   /* 20px */
  --text-2xl:  1.5rem;    /* 24px */
  --text-3xl:  2rem;      /* 32px */
  --text-4xl:  2.5rem;    /* 40px */
  --text-5xl:  3rem;      /* 48px */

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

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

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-tooltip: 600;

  /* Layout */
  --sidebar-width: 240px;
  --sidebar-collapsed: 72px;
  --header-height: 64px;
}

/* Light Theme - Pure White & Black */
[data-theme="light"] {
  --bg-primary:    #ffffff;
  --bg-secondary:  #f5f5f5;
  --bg-card:       #ffffff;
  --bg-elevated:   #eeeeee;
  --bg-hover:      #e0e0e0;
  --border:        #cccccc;
  --border-subtle: #e0e0e0;

  --text-primary:   #000000;
  --text-secondary: #555555;
  --text-muted:     #888888;
  --text-inverse:   #ffffff;

  --shadow-card:      0 2px 8px rgba(0,0,0,0.1);
  --shadow-elevated:  0 4px 16px rgba(0,0,0,0.15);
}