body {
            box-sizing: border-box;
        }
        
        .hero-gradient {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        
        .glass-effect {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .spinner {
            border: 3px solid #f3f4f6;
            border-top: 3px solid #3b82f6;
            border-radius: 50%;
            width: 24px;
            height: 24px;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .fade-in {
            animation: fadeIn 0.5s ease-in;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .floating {
            animation: floating 3s ease-in-out infinite;
        }
        
        @keyframes floating {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
        }
        
        .medication-tag {
            background: linear-gradient(135deg, #3b82f6, #1d4ed8);
            transition: all 0.3s ease;
        }
        
        .medication-tag:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
        }
        
        .feature-card {
            transition: all 0.3s ease;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }
        
        .drug-category {
            cursor: pointer;
            transition: all 0.2s ease;
        }
        
        .drug-category:hover {
            background-color: #f3f4f6;
        }
        
        .drug-category.selected {
            background-color: #dbeafe;
            border-color: #3b82f6;
        }