:root {
    /* Colors - Dark Theme (Premium & Vibrant) */
    --bg-base: #0f172a; /* Slate 900 */
    --bg-surface: #1e293b; /* Slate 800 */
    --bg-surface-elevated: #334155; /* Slate 700 */
    
    --primary: #8b5cf6; /* Violet 500 */
    --primary-hover: #7c3aed; /* Violet 600 */
    --primary-glow: rgba(139, 92, 246, 0.5);
    
    --secondary: #ec4899; /* Pink 500 */
    --secondary-hover: #db2777; /* Pink 600 */
    
    --accent: #06b6d4; /* Cyan 500 */
    
    --danger: #ef4444; /* Red 500 */
    --success: #10b981; /* Emerald 500 */
    --warning: #f59e0b; /* Amber 500 */

    --text-primary: #f8fafc; /* Slate 50 */
    --text-secondary: #94a3b8; /* Slate 400 */
    --text-muted: #64748b; /* Slate 500 */

    --border: rgba(255, 255, 255, 0.1);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 15px var(--primary-glow);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    
    /* Z-Index Layers */
    --z-base: 1;
    --z-overlay: 10;
    --z-modal: 100;
    --z-toast: 1000;
}