/* CSS Custom Properties (Variables) for Design System */
:root {
  /* Primary Colors - Colorblind-friendly palette */
  --color-primary: #d73027;        /* Red - accessible to all color blindness types */
  --color-primary-dark: #a50026;
  --color-primary-light: #feb4b4;
  
  --color-secondary: #4575b4;      /* Blue - distinguishable from red */
  --color-secondary-dark: #313695;
  --color-secondary-light: #a6c8e8;
  
  --color-accent: #f46d43;         /* Orange - works with colorblind vision */
  --color-accent-dark: #d73027;
  --color-accent-light: #fec5a0;
  
  --color-success: #2d7d32;        /* Green - darker for better contrast */
  --color-warning: #ff8f00;        /* Amber - distinguishable */
  --color-info: #1565c0;           /* Blue variation */
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  
  /* Text Colors */
  --color-text-primary: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-500);
  --color-text-inverse: var(--color-white);
  
  /* Background Colors */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);
  
  /* Border Colors */
  --color-border: var(--color-gray-200);
  --color-border-light: var(--color-gray-100);
  --color-border-dark: var(--color-gray-300);
  
  /* Light Mode Gradients */
  --gradient-primary: linear-gradient(135deg, #d73027 0%, #f46d43 100%);
  --gradient-secondary: linear-gradient(135deg, #4575b4 0%, #74add1 100%);
  --gradient-hero: linear-gradient(135deg, #fafafa 0%, #e5e5e5 50%, #d4d4d4 100%);
  --gradient-accent: linear-gradient(45deg, #f46d43 0%, #fdae61 100%);
  
  /* Navigation hover colors */
  --nav-hover-color: var(--color-secondary);
  
  /* Typography */
  --font-family-primary: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-family-heading: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-family-body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Consolas', 'Monaco', 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-size-5xl: 3rem;       /* 48px */
  --font-size-6xl: 3.75rem;    /* 60px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --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 */
  --space-4xl: 6rem;     /* 96px */
  --space-5xl: 8rem;     /* 128px */
  
  /* Borders */
  --border-width: 1px;
  --border-radius-sm: 0.25rem;   /* 4px */
  --border-radius-md: 0.5rem;    /* 8px */
  --border-radius-lg: 0.75rem;   /* 12px */
  --border-radius-xl: 1rem;      /* 16px */
  --border-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);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Breakpoints (for reference in media queries) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* Container max-widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --color-text-primary: var(--color-gray-50);
  --color-text-secondary: var(--color-gray-300);
  --color-text-muted: var(--color-gray-400);
  --color-text-inverse: var(--color-gray-900);
  
  --color-bg-primary: var(--color-gray-900);
  --color-bg-secondary: var(--color-gray-800);
  --color-bg-tertiary: var(--color-gray-700);
  
  --color-border: var(--color-gray-700);
  --color-border-light: var(--color-gray-800);
  --color-border-dark: var(--color-gray-600);
  
  /* Dark Mode Gradients - Different from light mode */
  --gradient-primary: linear-gradient(135deg, #d73027 0%, #a50026 100%);
  --gradient-secondary: linear-gradient(135deg, #313695 0%, #4575b4 100%);
  --gradient-hero: linear-gradient(135deg, #171717 0%, #262626 50%, #404040 100%);
  --gradient-accent: linear-gradient(45deg, #d73027 0%, #f46d43 100%);
  
  /* Navigation hover colors - red in dark mode */
  --nav-hover-color: var(--color-primary);
  
  /* Adjust colors for better dark mode contrast */
  --color-primary: #ff6b6b;
  --color-secondary: #74add1;
  --color-accent: #fec5a0;
}

/* High Contrast Mode for Accessibility */
@media (prefers-contrast: high) {
  :root {
    --color-text-primary: var(--color-black);
    --color-text-secondary: var(--color-gray-700);
    --color-bg-primary: var(--color-white);
  }
  
  [data-theme="dark"] {
    --color-text-primary: var(--color-white);
    --color-text-secondary: var(--color-gray-200);
    --color-bg-primary: var(--color-black);
  }
}

/* Reduced Motion for Accessibility */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
    --transition-slow: 0ms;
  }
  
  *, 
  *::before, 
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}