header {
    background: linear-gradient(135deg, rgba(106, 234, 102, 0.9) 0%, rgba(40, 148, 76, 0.9) 100%);
    color: white;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 60px;
}

.header-content h1 {
    font-size: 4rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}
@media (max-width: 768px) {
    header {
        height: 90vh;
    }
}