:root {
    /* Color Palette */
    --color-primary: #0a567f;
    --color-primary-hover: #25394d;
    --color-bg-dark: #121212;
    --color-bg-sidebar: #0c162b;
    --color-text-primary: #ffffff;
    --color-text-light-blue: #baf1f1;
    --color-heading-blue: #4aa6d8;
    --color-explanation-text: #b6b6b6;
    
    /* Accent Colors */
    --color-accent-cyan: #00bcd4;
    --color-highlight-yellow: #ffeb3b;
    --color-highlight-orange: #ff9800;
    
    /* Typography */
    --font-family-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    /* Font Sizes */
    --font-size-xs: 0.9rem;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 1.1rem;
    --font-size-xl: 1.2rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-tight: 1.4;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.6;
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 15px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    
    /* Border Radius */
    --border-radius-sm: 3px;
    --border-radius-md: 4px;
    --border-radius-lg: 6px;
    
    /* Shadows */
    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.3s ease-in-out;
    
    /* Z-Index */
    --z-index-dropdown: 1000;
    --z-index-notification: 1001;
    
    /* Text Decoration */
    --text-underline-thickness: 2px;
    --text-underline-offset: 3px;
}