/* ==================================================
   CSS VARIABLES — MASTER THEME
   Professional, ready-to-use defaults
   ================================================== */

:root {
  
  /* ----------------------------------
     Primary Color System
     ---------------------------------- */
  --color-primary: #2563eb;        /* Professional blue */
  --color-primary-light: #3b82f6;  /* Lighter blue for hovers */
  --color-primary-dark: #1e40af;   /* Darker blue for active states */
  
  --color-secondary: #f59e0b;      /* Warm amber accent */
  --color-secondary-light: #fbbf24;
  --color-secondary-dark: #d97706;
  
  /* ----------------------------------
     Neutral Grays (Foundation)
     ---------------------------------- */
  --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;
  
  /* ----------------------------------
     Semantic Text Colors
     ---------------------------------- */
  --color-text: var(--color-gray-900);
  --color-text-light: var(--color-gray-600);
  --color-text-muted: var(--color-gray-500);
  
  /* ----------------------------------
     Background Colors
     ---------------------------------- */
  --color-background: #ffffff;
  --color-background-alt: var(--color-gray-50);
  --color-background-dark: var(--color-gray-100);
  
  /* ----------------------------------
     Border & Divider Colors
     ---------------------------------- */
  --color-border: var(--color-gray-200);
  --color-border-light: var(--color-gray-100);
  --color-border-dark: var(--color-gray-300);
  
  /* ----------------------------------
     Semantic Status Colors
     ---------------------------------- */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* ----------------------------------
     Typography
     ---------------------------------- */
  --font-family-base: -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Oxygen-Sans, Ubuntu,
    Cantarell, "Helvetica Neue", sans-serif;
  --font-family-heading: var(--font-family-base);
  --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono",
    Menlo, Consolas, "Liberation Mono", monospace;
  
  --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-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;
  
  /* ----------------------------------
     Layout & Container Widths
     ---------------------------------- */
  --container-width: 1200px;
  --content-width: 1140px;
  --layout-width: 1200px;
  --gutter: 1.5rem;
  
  /* ----------------------------------
     Spacing Scale
     ---------------------------------- */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  
  /* ----------------------------------
     Border Radius
     ---------------------------------- */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-full: 9999px;  /* Fully rounded */
  
  /* Legacy support */
  --border-radius-sm: var(--radius-sm);
  --border-radius-md: var(--radius-md);
  --border-radius-lg: var(--radius-lg);
  
  /* ----------------------------------
     Shadows (Subtle depth)
     ---------------------------------- */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  
  /* ----------------------------------
     Transitions
     ---------------------------------- */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  
  /* ----------------------------------
     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;
}