/* ===========================
   🎨 Design Tokens
   Single source of truth for all design values
   =========================== */

:root {
  /* Brand Colors */
  --brand-blue: #4a90e2;
  --brand-blue-dark: #357abd;
  --brand-blue-darker: #2c5aa0;
  --brand-blue-light: #6ba3e8;
  --brand-blue-lighter: #eaf0ff;

  /* Brand Gradients */
  --brand-gradient: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-blue-dark) 100%);
  --brand-gradient-dark: linear-gradient(135deg, var(--brand-blue-dark) 0%, var(--brand-blue-darker) 100%);

  /* Neutral Colors */
  --ink: #2c3e50;
  --ink-light: #445;
  --muted: #6c757d;
  --muted-light: #9ca3af;
  --muted-lighter: #d1d5db;
  
  /* Text Colors */
  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-dark: #1f2431;
  --bg-dark-light: #222328;
  --bg-header: #334155;
  
  /* Border Colors */
  --border-light: #e6e9ef;
  --border-medium: #d1d5db;
  --border-strong: #9ca3af;
  --border-blue: rgba(74, 144, 226, 0.1);
  --border-blue-medium: rgba(74, 144, 226, 0.18);
  --border-blue-strong: rgba(74, 144, 226, 0.3);

  /* Spacing Scale */
  --space-xs: 0.25rem;    /* 4px */
  --space-sm: 0.5rem;     /* 8px */
  --space-md: 0.75rem;    /* 12px */
  --space-lg: 1rem;       /* 16px */
  --space-xl: 1.5rem;     /* 24px */
  --space-2xl: 2rem;      /* 32px */
  --space-3xl: 3rem;      /* 48px */
  --space-4xl: 4rem;      /* 64px */

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 12px;
  --radius-2xl: 14px;
  --radius-3xl: 16px;
  --radius-4xl: 18px;
  --radius-5xl: 20px;
  --radius-6xl: 25px;
  --radius-full: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 6px 20px rgba(74, 144, 226, 0.4);
  --shadow-2xl: 0 10px 25px rgba(74, 144, 226, 0.45);
  --shadow-brand-sm: 0 2px 6px rgba(74, 144, 226, 0.3);
  --shadow-brand-md: 0 4px 12px rgba(74, 144, 226, 0.25);
  --shadow-brand-lg: 0 6px 20px rgba(74, 144, 226, 0.35);
  --shadow-brand-xl: 0 10px 24px rgba(74, 144, 226, 0.28);
  --shadow-brand-2xl: 0 12px 30px rgba(2, 8, 20, 0.18);
  --shadow-brand-hover: 0 10px 20px rgba(74, 144, 226, 0.16);

  /* Typography - Font Sizes */
  --font-xs: 0.75rem;     /* 12px */
  --font-sm: 0.875rem;    /* 14px */
  --font-base: 1rem;      /* 16px */
  --font-lg: 1.125rem;    /* 18px */
  --font-xl: 1.25rem;     /* 20px */
  --font-2xl: 1.5rem;     /* 24px */
  --font-3xl: 1.875rem;   /* 30px */
  --font-4xl: 2.25rem;    /* 36px */

  /* Typography - Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* Typography - Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;
  --leading-loose: 1.75;

  /* Typography - Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.4px;
  --tracking-widest: 0.6px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.3s ease;
  --transition-slower: 0.6s ease;

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}