[data-theme="dark-neon"] {
  color-scheme: dark;
  --_bg:            #000000;
  --_surface:       hsl(220, 20%, 6%);
  --_surface-alt:   hsl(220, 20%, 10%);
  --_text:          hsl(180, 30%, 95%);
  --_text-muted:    hsl(180, 20%, 65%);
  --_text-inverse:  #000000;
  --_primary:       hsl(180, 100%, 55%);
  --_primary-hover: hsl(180, 100%, 65%);
  --_primary-text:  #000000;
  --_accent:        hsl(320, 100%, 60%);
  --_border:        hsl(180, 50%, 18%);
  --_border-strong: hsl(180, 80%, 35%);
  --_success:       hsl(140, 100%, 55%);
  --_warning:       hsl(55, 100%, 55%);
  --_danger:        hsl(340, 100%, 60%);
  --_info:          hsl(200, 100%, 62%);
  --_shadow-sm:     0 0 10px hsl(180 100% 55% / 0.15);
  --_shadow-md:     0 0 20px hsl(180 100% 55% / 0.2), 0 0 40px hsl(320 100% 60% / 0.1);
  --_shadow-lg:     0 0 40px hsl(180 100% 55% / 0.3), 0 0 80px hsl(320 100% 60% / 0.2);
}

/* Neon glow effects on interactive elements */
[data-theme="dark-neon"] .btn-primary {
  box-shadow: 0 0 12px hsl(180 100% 55% / 0.5);
}
[data-theme="dark-neon"] .btn-primary:hover {
  box-shadow: 0 0 20px hsl(180 100% 55% / 0.7), 0 0 40px hsl(180 100% 55% / 0.3);
}