
        :root {
            --bg-primary: rgba(15, 23, 42, 0.95);
            --bg-secondary: rgba(30, 41, 59, 0.8);
            --bg-glass: rgba(255, 255, 255, 0.05);
            --border-color: rgba(255, 255, 255, 0.1);
            --text-primary: rgba(255, 255, 255, 0.95);
            --text-secondary: rgba(255, 255, 255, 0.7);
            --text-muted: rgba(255, 255, 255, 0.5);
            --accent-blue: #3b82f6;
            --accent-purple: #8b5cf6;
            --accent-green: #10b981;
            --accent-red: #ef4444;
            --accent-yellow: #f59e0b;
        }

        [data-theme="light"] {
            --bg-primary: rgba(248, 250, 252, 0.95);
            --bg-secondary: rgba(241, 245, 249, 0.9);
            --bg-glass: rgba(0, 0, 0, 0.03);
            --border-color: rgba(0, 0, 0, 0.1);
            --text-primary: rgba(15, 23, 42, 0.95);
            --text-secondary: rgba(30, 41, 59, 0.9);
            --text-muted: rgba(51, 65, 85, 0.8);
        }

        [data-theme="light"] .text-white {
            color: rgba(15, 23, 42, 0.95) !important;
        }

        [data-theme="light"] .text-white\/70 {
            color: rgba(30, 41, 59, 0.8) !important;
        }

        [data-theme="light"] .text-white\/80 {
            color: rgba(30, 41, 59, 0.85) !important;
        }

        [data-theme="light"] .text-white\/60 {
            color: rgba(51, 65, 85, 0.75) !important;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            
            .text-6xl {
                font-size: 2.5rem;
            }
            
            .text-4xl {
                font-size: 2rem;
            }
            
            .text-3xl {
                font-size: 1.5rem;
            }
            
            .grid-cols-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .md\\:grid-cols-3 {
                grid-template-columns: 1fr;
            }
            
            .md\\:grid-cols-2 {
                grid-template-columns: 1fr;
            }
            
            .lg\\:grid-cols-3 {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 640px) {
            .grid-cols-4 {
                grid-template-columns: 1fr;
            }
            
            .flex-wrap {
                flex-direction: column;
            }
            
            .space-x-4 > * + * {
                margin-left: 0;
                margin-top: 0.5rem;
            }
            
            .text-xl {
                font-size: 1.125rem;
            }
            
            .px-8 {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            
            .py-16 {
                padding-top: 2rem;
                padding-bottom: 2rem;
            }
        }

        .glassmorphism {
            background: var(--bg-glass);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border-color);
        }
        
        .gradient-bg {
            background: linear-gradient(-45deg, #1e293b, #334155, #475569, #64748b);
            background-size: 400% 400%;
            animation: gradient 20s ease infinite;
        }
        
        [data-theme="light"] .gradient-bg {
            background: linear-gradient(-45deg, #f8fafc, #e2e8f0, #cbd5e1, #94a3b8);
        }
        
        .text-gradient {
            background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .text-primary { color: var(--text-primary); }
        .text-secondary { color: var(--text-secondary); }
        .text-muted { color: var(--text-muted); }
        
        .correct { 
            color: var(--accent-green); 
            background-color: rgba(16, 185, 129, 0.1); 
        }
        .incorrect { 
            color: var(--accent-red); 
            background-color: rgba(239, 68, 68, 0.15); 
        }
        .current { 
            background-color: rgba(59, 130, 246, 0.2); 
            animation: typing 1s infinite; 
        }
        
        .particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: var(--accent-yellow);
            border-radius: 50%;
            pointer-events: none;
            animation: particle 3s ease-out forwards;
        }

        .theme-toggle {
            background: var(--bg-glass);
            border: 1px solid var(--border-color);
            color: var(--text-primary);
        }

        .theme-toggle:hover {
            background: var(--bg-secondary);
        }

        select, input, textarea {
            background: var(--bg-glass) !important;
            color: var(--text-primary) !important;
            border-color: var(--border-color) !important;
        }

        select:focus, input:focus, textarea:focus {
            border-color: var(--accent-blue) !important;
            outline: none !important;
        }

        select option {
            background: var(--bg-secondary) !important;
            color: var(--text-primary) !important;
        }
    