.main-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 2rem 1rem;
    border-radius: 15px;
    margin-bottom: 2rem;
    text-align: center;
    color: white;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

.sidebar-nav {
    background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    color: white;
}

.metric-card, .processing-card, .feature-card, .upload-area {
    background: #2e2e33;
    color: #e0e0e0;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
    height: 100%;
}

.fraud-alert {
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-top: 1rem;
    animation: pulse 2s infinite;
}

.safe-alert {
    background: linear-gradient(135deg, #51cf66, #40c057);
    color: white;
    padding: 1rem;
    border-radius: 10px;
    text-align: center;
    font-weight: bold;
    font-size: 1.2rem;
    margin-top: 1rem;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Fix Streamlit's dark theme overrides */
.st-emotion-cache-16txtl3 {
    color: #e0e0e0;
}