/* ============================================
   CSS VARIABLES - Design System
   ============================================ */

:root {
  /* ========== Colors - Light Mode ========== */

  /* Brand Colors */
  --color-primary: #0066FF;
  --color-primary-light: #338FFF;
  --color-primary-dark: #0052CC;

  --color-secondary: #FF6B35;
  --color-secondary-light: #FF8C5E;
  --color-secondary-dark: #E55A2B;

  --color-accent: #00D9FF;
  --color-accent-light: #33E3FF;
  --color-accent-dark: #00B8D9;

  /* Neutral Scale - Light Mode */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8F9FA;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F1F3F5;

  --color-text: #1A1A1A;
  --color-text-muted: #6B7280;
  --color-text-light: #9CA3AF;

  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;

  /* Shadows - Light Mode */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

  /* ========== Typography ========== */

  /* Font Families */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* 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 */

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

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* ========== Spacing ========== */
  --space-xs: 0.25rem;     /* 4px */
  --space-sm: 0.5rem;      /* 8px */
  --space-md: 1rem;        /* 16px */
  --space-lg: 1.5rem;      /* 24px */
  --space-xl: 2rem;        /* 32px */
  --space-2xl: 3rem;       /* 48px */
  --space-3xl: 4rem;       /* 64px */
  --space-4xl: 6rem;       /* 96px */
  --space-5xl: 8rem;       /* 128px */

  /* ========== Layout ========== */
  --container-max: 1200px;
  --container-padding: var(--space-xl);

  --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;

  /* ========== Transitions ========== */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* ========== Z-Index Scale ========== */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-popover: 500;
  --z-tooltip: 600;
}

/* ========== Dark Mode ========== */
[data-theme="dark"] {
  /* Neutral Scale - Dark Mode */
  --color-bg: #0A0A0A;
  --color-bg-alt: #141414;
  --color-surface: #1A1A1A;
  --color-surface-hover: #252525;

  --color-text: #F8F9FA;
  --color-text-muted: #9CA3AF;
  --color-text-light: #6B7280;

  --color-border: #2D2D2D;
  --color-border-light: #252525;

  /* Shadows - Dark Mode */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);

  /* Adjust brand colors for dark mode */
  --color-primary: #338FFF;
  --color-secondary: #FF8C5E;
  --color-accent: #33E3FF;
}

/* ========== Responsive Breakpoints ========== */
/*
  Usage in media queries:
  @media (min-width: 640px)  -> sm
  @media (min-width: 768px)  -> md
  @media (min-width: 1024px) -> lg
  @media (min-width: 1280px) -> xl
*/