/* =================================================================
   CSS VARIABLES - VELTECHLAB DESIGN SYSTEM
   ================================================================= */

:root {
  /* === COLORS === */
  /* Primary Brand Colors */
  --primary-50: #ecfdf5;
  --primary-100: #d1fae5;
  --primary-200: #a7f3d0;
  --primary-300: #6ee7b7;
  --primary-400: #34d399;
  --primary-500: #10b981;
  --primary-600: #059669;
  --primary-700: #047857;
  --primary-800: #065f46;
  --primary-900: #064e3b;

  /* Secondary Colors */
  --secondary-50: #f0f9ff;
  --secondary-100: #e0f2fe;
  --secondary-200: #bae6fd;
  --secondary-300: #7dd3fc;
  --secondary-400: #38bdf8;
  --secondary-500: #0ea5e9;
  --secondary-600: #0284c7;
  --secondary-700: #0369a1;
  --secondary-800: #075985;
  --secondary-900: #0c4a6e;

  /* Neutral Colors */
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;

  /* Dark Theme Colors */
  --dark-50: #f8fafc;
  --dark-100: #f1f5f9;
  --dark-200: #e2e8f0;
  --dark-300: #cbd5e1;
  --dark-400: #94a3b8;
  --dark-500: #64748b;
  --dark-600: #475569;
  --dark-700: #334155;
  --dark-800: #1e293b;
  --dark-900: #0f172a;

  /* Status Colors */
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* === TYPOGRAPHY === */
  /* Font Families */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-secondary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, 'Liberation Mono', Menlo, Courier, monospace;

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  --font-black: 900;

  /* Font Sizes */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  --text-7xl: 4.5rem;      /* 72px */

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* === SPACING === */
  --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 */
  --space-40: 10rem;       /* 160px */
  --space-48: 12rem;       /* 192px */
  --space-56: 14rem;       /* 224px */
  --space-64: 16rem;       /* 256px */

  /* === LAYOUT === */
  /* Container Sizes */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* Z-Index Scale */
  --z-auto: auto;
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* === BORDERS === */
  --border-width-0: 0;
  --border-width-1: 1px;
  --border-width-2: 2px;
  --border-width-4: 4px;
  --border-width-8: 8px;

  /* Border Radius */
  --rounded-none: 0;
  --rounded-sm: 0.125rem;   /* 2px */
  --rounded: 0.25rem;       /* 4px */
  --rounded-md: 0.375rem;   /* 6px */
  --rounded-lg: 0.5rem;     /* 8px */
  --rounded-xl: 0.75rem;    /* 12px */
  --rounded-2xl: 1rem;      /* 16px */
  --rounded-3xl: 1.5rem;    /* 24px */
  --rounded-full: 9999px;

  /* === SHADOWS === */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 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);

  /* === TRANSITIONS === */
  --transition-none: none;
  --transition-all: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-default: color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       background-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       border-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       text-decoration-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                       fill 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-colors: color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                      background-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                      border-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                      text-decoration-color 150ms cubic-bezier(0.4, 0, 0.2, 1), 
                      fill 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-opacity: opacity 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-shadow: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-transform: transform 150ms cubic-bezier(0.4, 0, 0.2, 1);

  /* === ANIMATION DURATIONS === */
  --duration-75: 75ms;
  --duration-100: 100ms;
  --duration-150: 150ms;
  --duration-200: 200ms;
  --duration-300: 300ms;
  --duration-500: 500ms;
  --duration-700: 700ms;
  --duration-1000: 1000ms;

  /* === EASING FUNCTIONS === */
  --ease-linear: linear;
  --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);
}

/* === SEMANTIC COLOR TOKENS === */
:root {
  /* Light Theme (Default) */
  --color-background: var(--neutral-50);
  --color-surface: var(--neutral-100);
  --color-surface-elevated: #ffffff;
  
  --color-text-primary: var(--neutral-900);
  --color-text-secondary: var(--neutral-600);
  --color-text-tertiary: var(--neutral-500);
  --color-text-inverse: #ffffff;
  
  --color-border: var(--neutral-200);
  --color-border-hover: var(--neutral-300);
  --color-border-focus: var(--primary-500);
  
  --color-accent: var(--primary-500);
  --color-accent-hover: var(--primary-600);
  --color-accent-light: var(--primary-50);
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: var(--dark-900);
    --color-surface: var(--dark-800);
    --color-surface-elevated: var(--dark-700);
    
    --color-text-primary: var(--dark-50);
    --color-text-secondary: var(--dark-300);
    --color-text-tertiary: var(--dark-400);
    --color-text-inverse: var(--dark-900);
    
    --color-border: var(--dark-700);
    --color-border-hover: var(--dark-600);
    --color-border-focus: var(--primary-400);
    
    --color-accent: var(--primary-400);
    --color-accent-hover: var(--primary-300);
    --color-accent-light: var(--primary-900);
  }
}

/* Force Dark Theme Class */
.dark {
  --color-background: var(--dark-900);
  --color-surface: var(--dark-800);
  --color-surface-elevated: var(--dark-700);
  
  --color-text-primary: var(--dark-50);
  --color-text-secondary: var(--dark-300);
  --color-text-tertiary: var(--dark-400);
  --color-text-inverse: var(--dark-900);
  
  --color-border: var(--dark-700);
  --color-border-hover: var(--dark-600);
  --color-border-focus: var(--primary-400);
  
  --color-accent: var(--primary-400);
  --color-accent-hover: var(--primary-300);
  --color-accent-light: var(--primary-900);
}