/* CSS Variables for Design System */
:root {
  /* Color Palette - Light Theme */
  --color-primary: #2563eb;
  --color-primary-rgb: 37, 99, 235;
  --color-secondary: #7c3aed;
  --color-accent: #059669;
  --color-neutral: #374151;
  --color-background: #eff6fc;
  --color-text: #111827;
  --color-text-light: #6b7280;
  --color-text-meta: #9ca3af;
  --color-white: #ffffff;
  --color-border: #e5e7eb;
  --color-card-bg: #ffffff;
  --color-header-bg: rgba(255, 255, 255, 0.2);
  --color-footer-bg: #374151;
  --color-hero-bg: linear-gradient(135deg, #f9fafb 0%, rgba(37, 99, 235, 0.05) 100%);
  --color-download-bg: linear-gradient(135deg, #f9fafb 0%, rgba(37, 99, 235, 0.05) 100%);
  
  /* Navigation Slider Colors */
  --color-nav-slider-start: rgba(37, 99, 235, 0.12);
  --color-nav-slider-end: rgba(37, 99, 235, 0.06);
  --color-nav-slider-shadow-primary: rgba(37, 99, 235, 0.2);
  --color-nav-slider-shadow-secondary: rgba(37, 99, 235, 0.1);
  
  /* Typography */
  --font-family-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  
  /* Font Sizes */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing System */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-12: 6rem;
  --space-16: 8rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-xxxl: 3rem;

  
  /* 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);

  /* Blur */
  --blur-lg: blur(10px);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  
  /* Z-index Scale */
  --z-sticky: 1020;
}