body {
            box-sizing: border-box;
        }
        
        .weather-card {
            backdrop-filter: blur(10px);
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .gradient-bg {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100%;
        }
        
        .loading-spinner {
            border: 3px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top: 3px solid white;
            width: 30px;
            height: 30px;
            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); }
        }