:root {
  /* Colors - Neutrals (Clean, Cool, Professional) */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #FAFAFA; /* Very light gray, almost white */
  --color-bg-tertiary: #F4F4F5;
  --color-bg-hover: #F4F4F5;
  --color-bg-active: #E4E4E7;

  --color-text-primary: #18181B; /* Zinc-900 */
  --color-text-secondary: #52525B; /* Zinc-600 */
  --color-text-tertiary: #A1A1AA; /* Zinc-400 */
  --color-text-inverse: #FFFFFF;

  /* Colors - Accent (Refined, slightly more vibrant) */
  --color-red: #EF4444;
  --color-red-bg: #FEF2F2;
  --color-orange: #F97316;
  --color-orange-bg: #FFF7ED;
  --color-yellow: #EAB308;
  --color-yellow-bg: #FEFCE8;
  --color-green: #22C55E;
  --color-green-bg: #F0FDF4;
  --color-blue: #3B82F6;
  --color-blue-bg: #EFF6FF;
  --color-purple: #A855F7;
  --color-purple-bg: #FAF5FF;
  --color-pink: #EC4899;
  --color-pink-bg: #FDF2F8;
  --color-brown: #92400E; /* More distinct brown */
  --color-brown-bg: #FFFBEB; /* Amber-50ish */
  --color-gray: #71717A;
  --color-gray-bg: #F4F4F5;
  
  /* Modern Touch - Primary Action */
  --color-primary: #18181B; /* Black primary buttons */
  --color-primary-hover: #27272A;
  --color-on-primary: #FFFFFF;

  /* Colors - Functional */
  --color-border: #E4E4E7; /* Zinc-200 */
  --color-border-subtle: #F4F4F5;
  --color-border-focus: #18181B; /* Black focus for stark contrast */
  --color-shadow: rgba(0, 0, 0, 0.04);
  --color-shadow-hover: rgba(0, 0, 0, 0.08);
  --color-overlay: rgba(0, 0, 0, 0.4);

  /* Typography */
  --font-family-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */

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

  --line-height-tight: 1.1;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing (Fluid scaling) */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Layout */
  --column-width: 320px; /* Wider columns */
  --column-gap: 1.5rem;
  --card-padding: 1rem;
  --header-height: 64px;

  /* Shadows (Soft, Diffuse, Modern) */
  --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-card: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-dropdown: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.25, 0.8, 0.25, 1);

  /* Z-index */
  --z-dropdown: 100;
  --z-modal-overlay: 1000;
  --z-modal: 1001;
  --z-toast: 2000;
}