.screen { display: none; }
    .screen.active { display: flex; animation: fadeIn 0.3s ease-out; }
    @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
    .option-btn.selected { border-color: #2563eb; background-color: #eff6ff; }
    .option-btn.selected .badge { background-color: #2563eb; color: white; border-color: #1d4ed8; }
    
    /* Custom scrollbar for better look */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 4px; }
    ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
    ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

    @keyframes shake {
        0%, 100% { transform: translateX(0); }
        25% { transform: translateX(-8px); }
        75% { transform: translateX(8px); }
    }
    .animate-shake { animation: shake 0.4s ease-in-out; }