:root {
  /* Surfaces */
  --color-bg:         #07090f;
  --color-surface:    #0d1117;
  --color-surface-2:  #131924;
  --color-surface-3:  #1c2333;

  /* Accents */
  --color-primary:    #00d4ff;
  --color-secondary:  #7b2fff;
  --color-success:    #00e5a0;
  --color-warning:    #ffab00;

  /* Text */
  --color-text:       #e6edf3;
  --color-muted:      #7d8590;
  --color-faint:      #3d444d;

  /* Gradient */
  --gradient-brand: linear-gradient(135deg, #00d4ff 0%, #7b2fff 100%);

  /* Typography */
  --font-display: 'Orbitron', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  /* Type Scale (fluid clamp) */
  --text-xs:   clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-hero: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem; --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;    --space-6: 1.5rem;  --space-8: 2rem;
  --space-10: 2.5rem; --space-12: 3rem;   --space-16: 4rem;
  --space-20: 5rem;   --space-24: 6rem;

  /* Radius */
  --radius-sm: 6px; --radius-md: 12px; 
  --radius-lg: 16px; --radius-xl: 20px; --radius-full: 9999px;

  /* Shadows */
  --shadow-card:  0 0 0 1px rgba(0,212,255,0.08), 
                  0 8px 32px rgba(0,0,0,0.4);
  --shadow-hover: 0 0 0 1px rgba(0,212,255,0.25), 
                  0 0 32px rgba(0,212,255,0.15),
                  0 12px 40px rgba(0,0,0,0.5);
  --shadow-cta:   0 0 48px rgba(0,212,255,0.4);

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.3s var(--ease-out-expo);
}

/* LIGHT MODE */
[data-theme="light"] {
  --color-bg:       #f5f7fa;
  --color-surface:  #ffffff;
  --color-surface-2: #f0f2f5;
  --color-surface-3: #e8eaf0;
  --color-primary:  #0077cc;
  --color-secondary: #5a20d6;
  --color-text:     #0d1117;
  --color-muted:    #57606a;
  --color-faint:    #afb8c1;
  --shadow-card:    0 0 0 1px rgba(0,0,0,0.08), 
                    0 4px 16px rgba(0,0,0,0.08);
  --shadow-hover:   0 0 0 1px rgba(0,119,204,0.3), 
                    0 8px 32px rgba(0,119,204,0.12);
}