:root {
    --primary-color: #2c3e50;
    --primary-dark: #1a252f;
    --text-primary: #333;
    --text-secondary: #555;
    --gray-100: #f5f5f5;
    --gray-500: #999;
    --gray-600: #7f8c8d;
    --border-color: #ddd;
    --header-bg: #ffffff;
}