:root {
  /* Colors - Primary (Xanh dương đậm) */
  --color-primary: #1e3a8a; /* Blue 900 */
  --color-primary-dark: #172554; /* Blue 950 */
  --color-primary-light: #2563eb; /* Blue 600 */
  
  /* Colors - Secondary (Xanh lá chi tiết) */
  --color-secondary: #10b981; /* Emerald 500 */
  --color-secondary-dark: #059669; /* Emerald 600 */
  --color-secondary-light: #34d399; /* Emerald 400 */
  
  /* Colors - CTA (Đỏ/Cam nhấn) */
  --color-cta: #ef4444; /* Red 500 */
  --color-cta-hover: #dc2626; /* Red 600 */
  --color-cta-light: #fee2e2; /* Red 100 */
  
  /* Colors - Background */
  --color-bg-light: #ffffff;
  --color-bg-dark: #0f172a; /* Slate 900 */
  --color-bg-muted: #f8fafc; /* Slate 50 */
  --color-bg-card: #ffffff;
  
  /* Colors - Text */
  --color-text-heading: #0f172a;
  --color-text-body: #334155;
  --color-text-muted: #64748b;
  --color-text-light: #f8fafc;
  
  /* Colors - Border */
  --color-border: #e2e8f0;
  --color-border-dark: #334155;
  
  /* Typography */
  --font-heading: 'Inter', 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: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Container */
  --container-max: 1280px;
  --container-padding: 1.5rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --color-bg-light: #0f172a;
  --color-bg-muted: #1e293b;
  --color-bg-card: #1e293b;
  --color-text-heading: #f8fafc;
  --color-text-body: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-border: #334155;
}

:root {
  /* Colors - Gradients */
  --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
  --gradient-tech: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
  --gradient-accent: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-glow: linear-gradient(45deg, #3b82f6, #8b5cf6);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-blur: blur(12px);

  /* Shadows - Modern Soft */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 15px rgba(59, 130, 246, 0.6);

  /* Animations & Transitions */
  --transition-fast: 0.15s ease-in-out;
  --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);
}