/* CSS Variables for style normalization */
:root {
  /* Primary colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-text-primary: #000000;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  --color-border-primary: #e0e0e0;
  --color-border-secondary: #d1d5db;
  --color-accent: #007acc;
  --color-accent-hover: #005a9e;
  
  /* Dark mode colors */
  --color-bg-primary-dark: #000000;
  --color-bg-secondary-dark: #1a1a1a;
  --color-bg-tertiary-dark: #333333;
  --color-text-primary-dark: #ffffff;
  --color-text-secondary-dark: #cccccc;
  --color-text-tertiary-dark: #999999;
  --color-border-primary-dark: #404040;
  --color-border-secondary-dark: #555555;
  --color-accent-dark: #4fc3f7;
  --color-accent-hover-dark: #29b6f6;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  
  /* Borders */
  --border-radius-sm: 4px;
  --border-radius-md: 6px;
  --border-radius-lg: 8px;
  
  /* Light shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;
  
  /* Overlay opacities */
  --overlay-opacity-light: 0.6;
  --overlay-opacity-dark: 0.5;
  
  /* Logo font */
  --font-logo: 'Source Sans Pro', 'Times New Roman', serif;
}

/* Spinner animation */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}