:root {
  /* Premium Dark Theme */
  --color-bg: #0b0f19;
  --color-surface: rgba(20, 27, 45, 0.6);
  --color-surface-hover: rgba(30, 41, 59, 0.8);
  --color-surface-solid: #141b2d;
  
  --color-primary: #10B981; /* Neon Emerald */
  --color-primary-dark: #059669;
  --color-primary-glow: rgba(16, 185, 129, 0.3);
  --color-secondary: #0ea5e9; /* Cyan */
  --color-secondary-glow: rgba(14, 165, 233, 0.3);
  
  --color-text-main: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-border: rgba(255, 255, 255, 0.08);
  
  /* Typography */
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2.5rem;
  --spacing-2xl: 4rem;

  /* Geometry & Effects */
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  
  --shadow-glow: 0 0 25px var(--color-primary-glow);
  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
  --backdrop-blur: blur(16px);
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Overrides */
[data-theme="light"] {
  --color-bg: #f8fafc;
  --color-surface: rgba(255, 255, 255, 0.8);
  --color-surface-hover: rgba(241, 245, 249, 0.9);
  --color-surface-solid: #ffffff;
  
  --color-primary: #059669; 
  --color-primary-dark: #047857;
  --color-primary-glow: rgba(5, 150, 105, 0.2);
  --color-secondary: #0284c7; 
  --color-secondary-glow: rgba(2, 132, 199, 0.2);
  
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-border: rgba(0, 0, 0, 0.1);
  
  --shadow-glow: 0 0 20px var(--color-primary-glow);
  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(0,0,0,0.1);
}
[data-theme="light"] .site-footer {
  background: #f1f5f9;
  border-top: 1px solid rgba(0,0,0,0.1);
}
[data-theme="light"] .article-content h2, 
[data-theme="light"] .article-content h3 {
  color: #0f172a;
  border-bottom-color: rgba(0,0,0,0.1);
}
[data-theme="light"] .article-content p,
[data-theme="light"] .article-content ul,
[data-theme="light"] .article-content ol {
  color: #334155;
}
[data-theme="light"] .main-nav a:hover,
[data-theme="light"] .main-nav a[aria-current="page"] {
  color: #0f172a;
}
[data-theme="light"] .search-form input {
  color: #0f172a;
}
[data-theme="light"] h1, 
[data-theme="light"] h2, 
[data-theme="light"] h3, 
[data-theme="light"] h4, 
[data-theme="light"] h5, 
[data-theme="light"] h6 {
  color: #0f172a;
}
[data-theme="light"] .hero h1 {
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
[data-theme="light"] .card-content h3 a {
  color: #0f172a;
}
[data-theme="light"] .footer-links h3, 
[data-theme="light"] .footer-legal h3 {
  color: #0f172a;
}