/* ==========================================================================
   variables.css - Enterprise Design System Tokens
   ========================================================================== */

   :root {
    /* --------------------------------------------------------------------------
       Typography Scale (Fluid & Responsive)
       -------------------------------------------------------------------------- */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    
    --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-size-7xl: 4.5rem;     /* 72px */
    --font-size-8xl: 6rem;       /* 96px */
  
    --line-height-tight: 1.1;
    --line-height-snug: 1.3;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
  
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
  
    /* --------------------------------------------------------------------------
       Color Tokens - Default (Light Mode)
       -------------------------------------------------------------------------- */
    --color-primary: #0055FF;         /* Trustworthy Tech Blue */
    --color-primary-hover: #0044CC;
    --color-primary-light: #E5EEFF;
    --color-primary-transparent: rgba(0, 85, 255, 0.1);
    
    --color-secondary: #000000;
    
    /* Gradients */
    --color-accent-start: #7B2CBF;
    --color-accent-end: #3A0CA3;
    --gradient-primary: linear-gradient(135deg, var(--color-primary), #00B4DB);
    --gradient-accent: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.3));
    --gradient-glass-dark: linear-gradient(135deg, rgba(30, 30, 30, 0.8), rgba(15, 15, 15, 0.3));
  
    /* Surface Colors */
    --color-bg-primary: #FAFAFA;
    --color-bg-secondary: #FFFFFF;
    --color-bg-tertiary: #F3F4F6;
    
    /* Text Colors */
    --color-text-primary: #111827;    /* Almost Black for readable contrast */
    --color-text-secondary: #4B5563;  /* Soft Gray for secondary text */
    --color-text-tertiary: #9CA3AF;
    --color-text-inverse: #FFFFFF;
  
    /* Border Colors */
    --color-border: #E5E7EB;
    --color-border-hover: #D1D5DB;
    --color-border-light: rgba(255, 255, 255, 0.2);
  
    /* Semantic Colors */
    --color-success: #10B981;
    --color-success-light: #D1FAE5;
    --color-error: #EF4444;
    --color-error-light: #FEE2E2;
    --color-warning: #F59E0B;
    --color-warning-light: #FEF3C7;
    --color-info: #3B82F6;
    --color-info-light: #DBEAFE;
  
    /* --------------------------------------------------------------------------
       Spacing System
       -------------------------------------------------------------------------- */
    --spacing-0: 0;
    --spacing-1: 0.25rem;    /* 4px */
    --spacing-2: 0.5rem;     /* 8px */
    --spacing-3: 0.75rem;    /* 12px */
    --spacing-4: 1rem;       /* 16px */
    --spacing-5: 1.25rem;    /* 20px */
    --spacing-6: 1.5rem;     /* 24px */
    --spacing-8: 2rem;       /* 32px */
    --spacing-10: 2.5rem;    /* 40px */
    --spacing-12: 3rem;      /* 48px */
    --spacing-16: 4rem;      /* 64px */
    --spacing-20: 5rem;      /* 80px */
    --spacing-24: 6rem;      /* 96px */
    --spacing-32: 8rem;      /* 128px */
    --spacing-40: 10rem;     /* 160px */
  
    /* --------------------------------------------------------------------------
       Layout System
       -------------------------------------------------------------------------- */
    --container-max-width: 1280px;
    --container-narrow-width: 800px;
    --header-height: 80px;
    
    /* --------------------------------------------------------------------------
       Border Radius
       -------------------------------------------------------------------------- */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --border-radius-2xl: 1rem;
    --border-radius-3xl: 1.5rem;
    --border-radius-full: 9999px;
  
    /* --------------------------------------------------------------------------
       Elevation & Shadows (Soft & Premium)
       -------------------------------------------------------------------------- */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.1);
    
    --shadow-glow-primary: 0 0 20px rgba(0, 85, 255, 0.3);
    --shadow-glow-accent: 0 0 20px rgba(123, 44, 191, 0.3);
  
    /* --------------------------------------------------------------------------
       Animation Tokens
       -------------------------------------------------------------------------- */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 600ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }