/* Base Styles & Reset */
* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

body { 
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; 
    background: #f5f5f5; 
    color: #333;
}

.hidden { 
    display: none !important; 
}

.error { 
    color: #f44336; 
    margin-top: 10px; 
    font-size: 14px; 
}

/* Animations */
@keyframes pulse { 
    0%, 100% { opacity: 1; } 
    50% { opacity: 0.3; } 
}