/* ================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ================================ */

:root {
  /* ===== Colors ===== */
  
  /* Primary Colors */
  --color-primary: #2563eb;
  --color-primary-light: #3b82f6;
  --color-primary-dark: #1d4ed8;
  
  /* Secondary Colors */
  --color-secondary: #7c3aed;
  --color-secondary-light: #8b5cf6;
  --color-secondary-dark: #6d28d9;
  
  /* Success */
  --color-success: #16a34a;
  --color-success-light: #22c55e;
  --color-success-dark: #15803d;
  
  /* Warning */
  --color-warning: #ea580c;
  --color-warning-light: #f97316;
  --color-warning-dark: #c2410c;
  
  /* Error/Danger */
  --color-error: #dc2626;
  --color-error-light: #ef4444;
  --color-error-dark: #b91c1c;
  
  /* Info */
  --color-info: #0891b2;
  --color-info-light: #06b6d4;
  --color-info-dark: #0e7490;
  
  /* Neutral Grays */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  --color-bg-dark: #111827;
  
  /* Text Colors */
  --color-text-primary: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #9ca3af;
  --color-text-inverse: #ffffff;
  
  /* Border Colors */
  --color-border-light: #e5e7eb;
  --color-border-medium: #d1d5db;
  --color-border-dark: #9ca3af;
  
  /* Gradient Colors */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-success: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%);
  --gradient-warning: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
  --gradient-blue-purple: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  /* ===== Spacing ===== */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  --spacing-3xl: 48px;
  --spacing-4xl: 64px;
  
  /* ===== Border Radius ===== */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* ===== Shadows ===== */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* ===== Typography ===== */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  
  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* ===== Transitions ===== */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* ===== Layout ===== */
  --sidebar-width: 256px;
  --sidebar-width-collapsed: 80px;
  --topnav-height: 72px;
  --content-max-width: 1440px;
  
  /* ===== Z-Index Scale ===== */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* ===== Glassmorphism ===== */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-blur: 16px;
  
  /* ===== Backdrop Blur ===== */
  --backdrop-blur-sm: blur(4px);
  --backdrop-blur-md: blur(12px);
  --backdrop-blur-lg: blur(16px);
  --backdrop-blur-xl: blur(24px);
}

/* ===== Dark Mode Variables (Future Enhancement) ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-tertiary: #9ca3af;
    --glass-bg: rgba(31, 41, 55, 0.7);
    --glass-border: rgba(75, 85, 99, 0.3);
  }
}