.certificados-section {
    padding: 3rem 1rem;
}

.titulo-principal {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.certificados-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.8rem;
}

.certificado-item img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: 0.3s ease;
}

.certificado-item img:hover {
    transform: scale(1.03);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.22);
}