:root {
    --primary-color: #1b6ec2;
    --primary-dark: #1861ac;
    --primary-light: #258cfb;
    --secondary-color: #6c757d;
    --tertiary-color: #667eea;
    --tertiary-dark: #764ba2;
    
    --success-color: #26b050;
    --success-light: #66bb6a;
    --error-color: #e50000;
    --error-dark: #b32121;
    --warning-color: #FFE500;
    
    --link-color: #006bb7;
    
    --background-primary: #ffffff;
    --background-secondary: #f5f5f5;
    --background-tertiary: #e0e0e0;
    --background-hover: #eeeeee;
    
    --text-primary: #212529;
    --text-secondary: #424242;
    --text-tertiary: #757575;
    --text-disabled: #929292;
    --text-on-primary: #ffffff;
    
    --border-color: rgba(0, 0, 0, 0.12);
    --border-light: #e0e0e0;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 2px 8px rgba(102, 126, 234, 0.3);
    --shadow-xl: 0 2px 12px rgba(102, 126, 234, 0.5);
    
    --gradient-thinking: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #6c757d 0%, #5a6268 100%);
    
    --code-background: rgba(0, 0, 0, 0.04);
    --table-header-background: rgba(0, 0, 0, 0.04);
    
    --focus-ring-color: #258cfb;
    --focus-ring-width: 0.25rem;
}