/* ============================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================
   This file defines all colors, fonts, spacing,
   and other design tokens used throughout the site.

   WHY: Centralizing values makes it easy to update
   the entire site's look by changing values here.
   ============================================ */

:root {
  /* ========== COLOR PALETTE ========== */

  /* Primary Greens - Brand Color */
  --primary-green: #10B981;        /* Emerald - Main brand color */
  --primary-green-dark: #059669;   /* Darker for hover states */
  --primary-green-light: #D1FAE5;  /* Light tint for backgrounds */

  /* Primary Blues - Secondary/Accent */
  --primary-blue: #3B82F6;         /* Modern blue - Professional */
  --primary-blue-dark: #1E40AF;    /* Navy blue - Authority */
  --primary-blue-light: #DBEAFE;   /* Light blue accents */

  /* Gradient Colors */
  --gradient-start: #10B981;       /* Green */
  --gradient-end: #3B82F6;         /* Blue */

  /* Neutral Grays */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Semantic Colors */
  --background: #FFFFFF;
  --background-alt: #F9FAFB;
  --text-primary: #111827;
  --text-secondary: #4B5563;
  --text-muted: #6B7280;
  --border: #E5E7EB;
  --border-light: #F3F4F6;

  /* ========== TYPOGRAPHY ========== */

  /* Font Families */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Font Sizes */
  --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: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */

  /* 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;

  /* ========== SPACING ========== */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  --spacing-5xl: 8rem;     /* 128px */

  /* ========== LAYOUT ========== */
  --max-width: 1280px;     /* Max content width */
  --max-width-narrow: 960px;
  --max-width-wide: 1440px;

  /* ========== BORDERS & RADIUS ========== */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-full: 9999px;   /* Circular */

  /* ========== 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);

  /* ========== TRANSITIONS ========== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* ========== Z-INDEX LAYERS ========== */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 50;
  --z-fixed: 100;
  --z-modal-backdrop: 500;
  --z-modal: 600;
  --z-tooltip: 700;
}