.gradient-bg {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .card-shadow {
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .pulse-animation {
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        .slide-in {
            animation: slideIn 0.5s ease-out forwards;
        }
        @keyframes slideIn {
            from { opacity: 0; transform: translateX(50px); }
            to { opacity: 1; transform: translateX(0); }
        }
        .progress-bar {
            transition: width 0.3s ease-in-out;
        }
        .symptom-card {
            transition: all 0.3s ease;
            cursor: pointer;
        }
        .symptom-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .selected {
            background: linear-gradient(135deg, #10b981, #34d399);
            color: white;
        }
        .risk-low { background: linear-gradient(135deg, #10b981, #34d399); }
        .risk-medium { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
        .risk-high { background: linear-gradient(135deg, #ef4444, #f87171); }
         .heart-beat {
            animation: heartbeat 2s ease-in-out infinite;
        }
        
        @keyframes heartbeat {
            0% { transform: scale(1); }
            14% { transform: scale(1.1); }
            28% { transform: scale(1); }
            42% { transform: scale(1.1); }
            70% { transform: scale(1); }
        }
        
        .fade-in {
            animation: fadeIn 0.8s ease-in-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .pulse-slow {
            animation: pulse 3s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }