html,
body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
}

.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 100vh;
}

.logo img {
    max-width: 300px;
    height: auto;
}

.slogan {
    font-size: 1.8rem;
    font-family: 'Arial Rounded MT Bold', sans-serif;
    color: #777;
    margin-bottom: 30px;
}

.sistemas-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8rem;
}

.sistema-card {
    flex: 1 1 200px;
    max-width: 300px;
    text-align: center;
    transition: transform 0.3s ease;
}

.sistema-card img {
    width: 100%;
    height: auto;
    filter: grayscale(100%);
    transition: transform 0.3s ease, filter 0.3s ease;
}

.sistema-card:hover img {
    filter: grayscale(0%);
    transform: scale(1.05);
}

footer {
    background-color: #005f26;
    color: #fff;
    font-size: 0.9rem;
    padding: 10px;
    display: flex;
    justify-content: space-between;
}

@media (max-width: 768px) {
    .slogan {
        font-size: 1.3rem;
    }
}