/**
 * CSS Variables - Design System
 * 
 * Custom properties for consistent theming across the application
 * Dark professional theme inspired by Kezor.com
 */

:root {
  /* ============================================
     COLOR PALETTE
     ============================================ */
  
  /* Brand Colors */
  --color-primary: #00d4ff;      /* Cyan - main brand */
  --color-primary-dark: #00a8cc;
  --color-primary-light: #33ddff;
  --color-secondary: #ff6b35;    /* Orange accent */
  --color-accent: #00ff88;       /* Green accent */
  
  /* Background Colors */
  --color-bg-primary: #0a0a0b;
  --color-bg-secondary: #1a1a1d;
  --color-bg-tertiary: #2d2d32;
  --color-bg-card: #1e1e23;
  --color-bg-input: #262629;
  --color-bg-nav: #141418;
  --color-bg-dark: #0a0a0b;
  
  /* Text Colors - HIGH CONTRAST */
  --color-text-primary: #ffffff;
  --color-text-secondary: #e0e0e0;
  --color-text-tertiary: #b0b0b0;
  --color-text-inverse: #0a0a0b;
  --color-text-heading: #ffffff;
  
  /* 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;
  
  /* Semantic Colors */
  --color-success: #00ff88;
  --color-success-light: #d1fae5;
  --color-warning: #ffb800;
  --color-warning-light: #fef3c7;
  --color-danger: #ff3366;
  --color-danger-light: #fee2e2;
  --color-info: #17a2b8;
  --color-info-light: #dbeafe;
  
  /* Border Colors */
  --color-border-light: #3a3a42;
  --color-border-medium: #2a2a32;
  --color-border-dark: #404040;
  
  /* ============================================
     TYPOGRAPHY
     ============================================ */
  
  /* Font Families */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 
                  'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 
                  Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira 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-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */
  
  /* Font Weights */
  --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 Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  
  /* ============================================
     SPACING SCALE
     ============================================ */
  
  --space-0: 0;
  --space-1: 0.25rem;    /* 4px */
  --space-2: 0.5rem;     /* 8px */
  --space-3: 0.75rem;    /* 12px */
  --space-4: 1rem;       /* 16px */
  --space-5: 1.25rem;    /* 20px */
  --space-6: 1.5rem;     /* 24px */
  --space-8: 2rem;       /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */
  --space-32: 8rem;      /* 128px */
  
  /* ============================================
     BORDERS & RADIUS
     ============================================ */
  
  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 4px;
  
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-full: 9999px;
  
  /* ============================================
     SHADOWS
     ============================================ */
  
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
  
  /* Card-specific shadows */
  --shadow-card: 0 2px 8px rgb(0 0 0 / 0.08), 0 1px 4px rgb(0 0 0 / 0.04);
  --shadow-card-hover: 0 8px 16px rgb(0 0 0 / 0.12), 0 4px 8px rgb(0 0 0 / 0.08);
  
  /* ============================================
     TRANSITIONS
     ============================================ */
  
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  --transition-slower: 500ms ease-in-out;
  
  /* ============================================
     Z-INDEX SCALE
     ============================================ */
  
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* ============================================
     BREAKPOINTS (for reference in JS)
     ============================================ */
  
  --breakpoint-xs: 0px;
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* ============================================
     PLAYING CARD DIMENSIONS
     ============================================ */
  
  /* Standard poker card: 2.5" × 3.5" (63.5mm × 88.9mm) */
  --card-width: 2.5in;
  --card-height: 3.5in;
  --card-aspect-ratio: 0.714; /* width/height */
  
  /* Print settings */
  --card-bleed: 0.125in;      /* Standard bleed for printing */
  --card-safe-area: 0.125in;  /* Keep important content inside */
  --card-dpi: 300;            /* Print quality */
  
  /* Digital display (scaled down) */
  --card-width-digital: 250px;
  --card-height-digital: 350px;
}

/* ============================================
   DARK MODE OVERRIDES
   ============================================ */

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-primary: #111827;
    --color-bg-secondary: #1f2937;
    --color-bg-tertiary: #374151;
    --color-bg-dark: #0d1117;
    
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-tertiary: #9ca3af;
    --color-text-inverse: #111827;
    
    --color-border-light: #374151;
    --color-border-medium: #4b5563;
    --color-border-dark: #6b7280;
  }
}

/* Optional: Allow manual dark mode toggle */
[data-theme="dark"] {
  --color-bg-primary: #111827;
  --color-bg-secondary: #1f2937;
  --color-bg-tertiary: #374151;
  --color-bg-dark: #0d1117;
  
  --color-text-primary: #f9fafb;
  --color-text-secondary: #d1d5db;
  --color-text-tertiary: #9ca3af;
  --color-text-inverse: #111827;
  
  --color-border-light: #374151;
  --color-border-medium: #4b5563;
  --color-border-dark: #6b7280;
}