.categorias-material {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
    margin: 28px auto 34px;
    width: 100%;
}

.btn-categoria {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 68px;
    padding: 14px 22px;
    border-radius: 12px;
    color: #fff !important;
    text-align: center;
    font-size: 22px;
    font-weight: 800;
    text-decoration: none !important;
    box-shadow: 0 5px 10px rgba(0,0,0,.18);
    transition: .2s ease;
}

.btn-digital {
    background: #008080;
    /*grid-column: 1 / -1;*/
}

.btn-tecnologico {
    background: #f7c948;
}

.btn-juegos {
    background: #ff7a00;
}

.btn-lenguaje {
    background: #d9534f;
}

.btn-matematicas {
    background: #007bff;
}

.btn-ciencias {
    background: #28a745;
}

.btn-ed-especial {
    background: #7b2cbf;
}

@media (max-width: 768px) {
    .categorias-material {
        grid-template-columns: 1fr;
    }

    .btn-categoria {
        font-size: 18px;
        min-height: 58px;
    }

    .btn-digital {
        grid-column: auto;
    }
}