/* Variables */
:root {
    /* Brand Colors */
    --color-primary-navy: #0A1628;
    --color-primary-navy-light: #1E3A5F;
    --color-primary-navy-dark: #050B14;
    
    --color-accent-blue: #00D4FF;
    --color-accent-blue-light: #4DE8FF;
    --color-accent-blue-dark: #00A8CC;
    
    --color-secondary-purple: #8B5CF6;
    --color-secondary-purple-light: #A78BFA;
    --color-secondary-purple-dark: #7C3AED;
    
    /* Backgrounds */
    --color-bg-white: #FFFFFF;
    --color-bg-light: #F8FAFC;
    --color-bg-dark: #0F172A;
    --color-bg-darker: #1E293B;
    
    /* Text */
    --color-text-dark: #0F172A;
    --color-text-body: #475569;
    --color-text-muted: #94A3B8;
    --color-text-light: #F8FAFC;
    --color-text-white: #FFFFFF;
    
    /* Gray Scale */
    --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 */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    
    /* Gradients */
    --gradient-accent: linear-gradient(135deg, var(--color-accent-blue), var(--color-secondary-purple));
    --gradient-dark: linear-gradient(135deg, var(--color-primary-navy-dark), var(--color-primary-navy));
    
    /* Spacing (4px/8px system) */
    --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 */
    
    /* Typography Scale (Fluid) */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    
    --text-xs: clamp(0.75rem, 0.7vw + 0.5rem, 0.875rem);
    --text-sm: clamp(0.875rem, 0.8vw + 0.5rem, 1rem);
    --text-base: clamp(1rem, 1vw + 0.5rem, 1.125rem);
    --text-lg: clamp(1.125rem, 1.2vw + 0.5rem, 1.25rem);
    --text-xl: clamp(1.25rem, 1.5vw + 0.5rem, 1.5rem);
    --text-2xl: clamp(1.5rem, 2vw + 0.5rem, 1.875rem);
    --text-3xl: clamp(1.875rem, 2.5vw + 0.5rem, 2.25rem);
    --text-4xl: clamp(2.25rem, 3.5vw + 0.5rem, 3rem);
    --text-5xl: clamp(3rem, 5vw + 0.5rem, 4rem);
    
    /* 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);
    
    /* Radii */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Z-Index */
    --z-negative: -1;
    --z-elevate: 10;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Containers */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
}