/* ============================================
   Design Tokens - QR Menu System
   CSS Custom Properties for consistent theming
   ============================================ */

:root {
  /* ============================================
     Colors
     ============================================ */
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: #818cf8;
  --color-success: #10b981;
  --color-success-dark: #059669;
  --color-warning: #f59e0b;
  --color-warning-dark: #d97706;
  --color-danger: #ef4444;
  --color-danger-dark: #dc2626;
  --color-info: #3b82f6;
  --color-info-dark: #2563eb;
  
  /* Neutral Colors */
  --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;
  
  /* ============================================
     Gradients
     ============================================ */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --gradient-purple: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  --gradient-info: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  
  /* ============================================
     Spacing Scale
     ============================================ */
  --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 */
  
  /* ============================================
     Border Radius
     ============================================ */
  --radius-sm: 0.375rem;    /* 6px */
  --radius-md: 0.5rem;      /* 8px */
  --radius-lg: 0.75rem;     /* 12px */
  --radius-xl: 1rem;        /* 16px */
  --radius-2xl: 1.5rem;     /* 24px */
  --radius-full: 9999px;    /* Fully rounded */
  
  /* ============================================
     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);
  
  /* Colored Shadows */
  --shadow-primary: 0 4px 15px rgba(99, 102, 241, 0.3);
  --shadow-primary-lg: 0 6px 20px rgba(99, 102, 241, 0.4);
  --shadow-success: 0 4px 15px rgba(16, 185, 129, 0.3);
  --shadow-warning: 0 4px 15px rgba(245, 158, 11, 0.3);
  --shadow-danger: 0 4px 15px rgba(239, 68, 68, 0.3);
  --shadow-info: 0 4px 15px rgba(59, 130, 246, 0.3);
  
  /* ============================================
     Transitions
     ============================================ */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  --transition-slower: 400ms ease-in-out;
  
  /* Specific Transition Properties */
  --transition-colors: color 200ms ease-in-out, background-color 200ms ease-in-out, border-color 200ms ease-in-out;
  --transition-transform: transform 200ms ease-in-out;
  --transition-shadow: box-shadow 200ms ease-in-out;
  --transition-all: all 200ms ease-in-out;
  
  /* ============================================
     Typography
     ============================================ */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* 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 */
  
  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  --letter-spacing-widest: 0.1em;
  
  /* ============================================
     Z-Index Scale
     ============================================ */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  
  /* ============================================
     Breakpoints (for reference in JS)
     ============================================ */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-xxl: 1400px;
}

/* ============================================
   Dark Mode Support (Optional)
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    /* Dark mode color adjustments can be added here if needed */
  }
}