:root {
    /* Colors */
    --color-primary: #2ecc71;
    --color-primary-dark: #27ae60;
    --color-secondary: #3498db;
    --color-secondary-dark: #2980b9;
    --color-danger: #e74c3c;
    --color-danger-dark: #c0392b;
    --color-warning: #f39c12;
    --color-success: #2ecc71;

    /* Neutral colors */
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #2d2d2d;
    --color-bg-tertiary: #3d3d3d;
    --color-surface: #2d2d2d;
    --color-surface-elevated: #3d3d3d;

    /* Text colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-text-muted: #808080;

    /* Border colors */
    --color-border: #4d4d4d;
    --color-border-light: #5d5d5d;

    /* Card suits */
    --color-hearts: #e74c3c;
    --color-diamonds: #e74c3c;
    --color-clubs: #2c3e50;
    --color-spades: #2c3e50;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Z-index */
    --z-base: 1;
    --z-elevated: 10;
    --z-overlay: 100;
    --z-modal: 1000;

    /* Font sizes */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 2rem;
}