:root {
  /* Colors */
  --primary: #2563eb;
  --primary-rgb: 37, 99, 235;
  --secondary: #38bdf8;
  --secondary-rgb: 56, 189, 248;
  --accent: #00d4ff;
  --accent-rgb: 0, 212, 255;
  
  /* Light Theme Color System */
  --dark: #07152e;
  --dark-rgb: 7, 21, 46;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --border-light: rgba(15, 23, 42, 0.06);
  --border-dark: rgba(15, 23, 42, 0.08);
  --border-glass: rgba(15, 23, 42, 0.08);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  --gradient-glow: radial-gradient(circle, rgba(var(--primary-rgb), 0.08) 0%, rgba(var(--secondary-rgb), 0.03) 50%, transparent 100%);
  --gradient-light-surface: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.95));
  --gradient-text: linear-gradient(135deg, var(--dark) 30%, var(--primary) 70%, var(--secondary) 100%);
  
  /* Fonts */
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Layout & Spacing (8-point Grid) */
  --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 */
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1140px;
  --container-xl: 1280px;
  --container-xxl: 1400px;
  --container-padding: clamp(1.5rem, 6vw, 6rem);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(7, 21, 46, 0.05), 0 2px 4px -2px rgba(7, 21, 46, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(7, 21, 46, 0.05), 0 4px 6px -4px rgba(7, 21, 46, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(7, 21, 46, 0.08), 0 8px 10px -6px rgba(7, 21, 46, 0.08);
  --shadow-2xl: 0 25px 50px -12px rgba(7, 21, 46, 0.15);
  --shadow-glass: 0 8px 32px 0 rgba(7, 21, 46, 0.06);
  --shadow-glow-blue: 0 0 40px rgba(var(--primary-rgb), 0.15);
  --shadow-glow-cyan: 0 0 40px rgba(var(--accent-rgb), 0.15);

  /* Borders & Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index */
  --z-negative: -1;
  --z-base: 1;
  --z-card: 10;
  --z-dropdown: 100;
  --z-header: 1000;
  --z-modal: 2000;
  --z-tooltip: 3000;
}