:root {
  /* Colors - UI Senior Refinements (Slight purple/indigo tint to avoid generic gray) */
  --color-primary: #5757FF;
  --color-primary-dark: #3f3fdb;
  --color-primary-light: rgba(87, 87, 255, 0.08);
  --color-primary-medium: rgba(87, 87, 255, 0.14);
  
  --color-dark: #12111f; /* Głęboki, elegancki atrament (zamiast obojętnego czarnego-szarego z tailwinda) */
  --color-dark-mid: #1d1c31; 
  --color-text: #4e5063; /* Szary z odrobiną satynowego niebieskiego */
  --color-text-secondary: #8a8d9e;
  
  --color-light: #f8f9fc;
  --color-light-secondary: #f0f2f8;
  --color-border: #e3e6f0;
  --color-border-light: #f1f3fa;
  --color-accent-gold: #f09f0a;
  --color-success: #0bba83;
  --color-error: #ef4444;
  --color-white: #ffffff;

  /* Typography (Base 16px, Perfect Fourth Type Scale: 1.333x) */
  --font-family-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Sizes using REMs for accessibility and perfect scaling */
  --font-size-xs: 0.75rem;     /* 12.0px */
  --font-size-sm: 0.875rem;    /* 14.0px */
  --font-size-base: 1rem;      /* 16.0px - Base */
  --font-size-lg: 1.125rem;    /* 18.0px - Minor Third variation for sub-headers*/
  --font-size-xl: 1.333rem;    /* 21.3px - Start of structured scale */
  --font-size-2xl: 1.777rem;   /* 28.4px */
  --font-size-3xl: 2.369rem;   /* 37.9px */
  --font-size-4xl: 3.157rem;   /* 50.5px */
  --font-size-5xl: 4.209rem;   /* 67.3px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Typographic vertical rhythm & Kerning adjustments */
  --line-height-heading: 1.1; 
  --line-height-subheading: 1.35;
  --line-height-body: 1.6;
  --line-height-loose: 1.75;
  
  --letter-spacing-heading-tight: -0.035em;
  --letter-spacing-heading: -0.02em;
  --letter-spacing-body: -0.01em;
  --letter-spacing-caps: 0.05em;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
  --shadow-primary: 0 8px 24px rgba(87, 87, 255, 0.28);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 400ms ease-in-out;

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-modal: 1100;
  --z-toast: 1200;
}