/* ==========================================================================
   DESIGN TOKENS SYSTEM
   Following modern design system principles for consistency and scalability
   ========================================================================== */

:root {
    /* ==================== COLOR TOKENS ==================== */
    
    /* Primary Colors */
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-200: #bfdbfe;
    --color-primary-300: #93c5fd;
    --color-primary-400: #60a5fa;
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-primary-700: #1d4ed8;
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;
    
    /* Secondary Colors */
    --color-secondary-50: #ecfeff;
    --color-secondary-100: #cffafe;
    --color-secondary-200: #a5f3fc;
    --color-secondary-300: #67e8f9;
    --color-secondary-400: #22d3ee;
    --color-secondary-500: #06b6d4;
    --color-secondary-600: #0891b2;
    --color-secondary-700: #0e7490;
    --color-secondary-800: #155e75;
    --color-secondary-900: #164e63;
    
    /* Accent Colors */
    --color-accent-50: #fff7ed;
    --color-accent-100: #ffedd5;
    --color-accent-200: #fed7aa;
    --color-accent-300: #fdba74;
    --color-accent-400: #fb923c;
    --color-accent-500: #f59e0b;
    --color-accent-600: #ea580c;
    --color-accent-700: #c2410c;
    --color-accent-800: #9a3412;
    --color-accent-900: #7c2d12;
    
    /* Neutral Colors */
    --color-neutral-50: #f8fafc;
    --color-neutral-100: #f1f5f9;
    --color-neutral-200: #e2e8f0;
    --color-neutral-300: #cbd5e1;
    --color-neutral-400: #94a3b8;
    --color-neutral-500: #64748b;
    --color-neutral-600: #475569;
    --color-neutral-700: #334155;
    --color-neutral-800: #1e293b;
    --color-neutral-900: #0f172a;
    
    /* Semantic Colors */
    --color-success-500: #10b981;
    --color-success-700: #047857;
    --color-error-500: #ef4444;
    --color-error-700: #b91c1c;
    --color-warning-500: #f59e0b;
    --color-warning-700: #b45309;
    --color-info-500: #3b82f6;
    --color-info-700: #1d4ed8;
    
    /* Surface Colors */
    --color-surface-primary: #ffffff;
    --color-surface-secondary: #f8fafc;
    --color-surface-tertiary: #f1f5f9;
    --color-surface-elevated: #ffffff;
    
    /* ==================== SPACING TOKENS ==================== */
    
    --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-7: 1.75rem;    /* 28px */
    --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 */
    
    /* ==================== TYPOGRAPHY TOKENS ==================== */
    
    /* Font Families */
    --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 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-size-7xl: 4.5rem;      /* 72px */
    
    /* 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-tighter: -0.05em;
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;
    
    /* ==================== BORDER TOKENS ==================== */
    
    --border-width-0: 0;
    --border-width-1: 1px;
    --border-width-2: 2px;
    --border-width-4: 4px;
    --border-width-8: 8px;
    
    --border-radius-none: 0;
    --border-radius-sm: 0.375rem;   /* 6px */
    --border-radius-md: 0.5rem;     /* 8px */
    --border-radius-lg: 0.75rem;    /* 12px */
    --border-radius-xl: 1rem;       /* 16px */
    --border-radius-2xl: 1.5rem;    /* 24px */
    --border-radius-full: 9999px;
    
    /* ==================== SHADOW TOKENS ==================== */
    
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
    
    /* Colored Shadows */
    --shadow-primary: 0 10px 25px -5px rgba(37, 99, 235, 0.3);
    --shadow-accent: 0 10px 25px -5px rgba(245, 158, 11, 0.3);
    
    /* ==================== TRANSITION TOKENS ==================== */
    
    --transition-fast: 150ms;
    --transition-base: 250ms;
    --transition-slow: 350ms;
    --transition-slower: 500ms;
    
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* ==================== Z-INDEX TOKENS ==================== */
    
    --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;
    
    /* ==================== BREAKPOINT TOKENS (for reference) ==================== */
    
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
    
    /* ==================== SEMANTIC TOKENS (Application Layer) ==================== */
    
    /* Using design tokens for actual application */
    --primary-color: var(--color-primary-600);
    --primary-dark: var(--color-primary-700);
    --secondary-color: var(--color-secondary-600);
    --accent-color: var(--color-accent-500);
    
    --text-dark: var(--color-neutral-800);
    --text-light: var(--color-neutral-500);
    --text-muted: var(--color-neutral-400);
    
    --bg-light: var(--color-surface-secondary);
    --bg-white: var(--color-surface-primary);
    --border-color: var(--color-neutral-200);
    
    --success-color: var(--color-success-500);
    --error-color: var(--color-error-500);
    --warning-color: var(--color-warning-500);
    --info-color: var(--color-info-500);
}

/* Dark Mode Support (Optional - ready for future implementation) */
@media (prefers-color-scheme: dark) {
    :root {
        --color-surface-primary: var(--color-neutral-900);
        --color-surface-secondary: var(--color-neutral-800);
        --text-dark: var(--color-neutral-50);
        --text-light: var(--color-neutral-400);
    }
}