.activity-detail__header {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 24px;
    padding-bottom: 20px;
}

.gallery-main img {
    display: block;
    width: 100%;
    height: auto;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 16px;
}

.gallery-thumb {
    border: 0;
    padding: 0;
    background: none;
    cursor: pointer;
}

.gallery-thumb img {
    display: block;
    width: 100%;
    height: auto;
}

.gallery-thumb.is-active {
    outline: 2px solid currentColor;
}

@media (max-width: 900px) {
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    .activity-detail__header {
        display: block;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}