/* Design Tokens - CSS Custom Properties */
/* 8px grid system, colors, typography, spacing, breakpoints */

:root {
  /* ===== SPACING (8px grid) ===== */
  --space-1: 0.5rem;   /* 8px */
  --space-2: 1rem;     /* 16px */
  --space-3: 1.5rem;   /* 24px */
  --space-4: 2rem;     /* 32px */
  --space-5: 2.5rem;   /* 40px */
  --space-6: 3rem;     /* 48px */
  --space-8: 4rem;     /* 64px */
  --space-10: 5rem;    /* 80px */
  --space-12: 6rem;    /* 96px */
  --space-16: 8rem;    /* 128px */
  
  /* ===== TYPOGRAPHY ===== */
  --font-family-sans: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: 'Orbitron', var(--font-family-sans);
  --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', 'Droid Sans Mono', 'Source Code Pro', 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-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-max-width: 1280px;
  --container-padding: var(--space-4);
  
  --header-height: 80px;
  --footer-min-height: 200px;
  
  /* ===== BORDERS ===== */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-full: 9999px;
  
  --border-width: 1px;
  --border-width-thick: 2px;
  
  /* ===== 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);
  
  /* ===== TRANSITIONS ===== */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* ===== Z-INDEX LAYERS ===== */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
  
  /* ===== BREAKPOINTS (reference only, use in media queries) ===== */
  /* 
  --breakpoint-sm: 640px;    Mobile landscape 
  --breakpoint-md: 768px;    Tablet portrait
  --breakpoint-lg: 1024px;   Tablet landscape / Small desktop
  --breakpoint-xl: 1280px;   Desktop
  --breakpoint-2xl: 1536px;  Large desktop
  */
}

/* ===== RESPONSIVE CONTAINER PADDING ===== */
@media (max-width: 640px) {
  :root {
    --container-padding: var(--space-3);
  }
}

@media (max-width: 420px) {
  :root {
    --container-padding: var(--space-2);
  }
}