/* 主要内容区域 */
.main-content {
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
}

.main-content > .container,
.main-content > #showMoreBtn {
    position: relative;
    z-index: 1;
}

#showMoreBtn {
    margin-top: 2rem;
    padding: 1rem;
    font-size: 17px;
    box-shadow: 0 4px 19px var(--color-shadow);
    background-color: var(--show-more-btn-background, #000409);
    color: var(--show-more-btn-text-color, #ffffff);
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-duration, 0.3s);
    max-width: 350px;
    margin: 0 auto;
    align-self: center;
    justify-self: center;
}

:root[data-theme="dark"] #showMoreBtn {
    --show-more-btn-background: #f9f9fa;
    --show-more-btn-text-color: #040404;
}

#showMoreBtn:hover {
    background-color: var(--show-more-btn-hover-background, #5a5b5d);
}

#showMoreBtn:active {
    background-color: var(--show-more-btn-active-background, #000409);
}

:root[data-theme="dark"] #showMoreBtn:hover {
    background-color: #656566;
}

:root[data-theme="dark"] #showMoreBtn:active {
    background-color: #f9f9fa;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(390px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem 0;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        padding: 0rem;
    }
}