/* Blog 专属样式：取消侧边栏，扩展主体 */
.content-grid {
    display: block;
    margin: 3rem 0 4rem;
}
.main-blog {
    width: 100%;
    max-width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}
.section-header {
    grid-column: 1 / -1;
}
.post-card {
    margin-bottom: 0;
    display: flex;
    flex-direction: column;
}
.post-card:last-child {
    margin-bottom: 0;
}
@media (max-width: 880px) {
    .main-blog {
        display: block;
    }
    .post-card {
        margin-bottom: 2rem;
    }
}