.related-posts, .pickup-posts {
  margin: 50px 0;
}


#related-article {
  margin: 5rem 20%;
}

@media (max-width: 480px) {
  #related-article {
    margin: 5rem 1rem;
  }
}
.section-title {
  font-size: 1.5rem;
  text-align: center;
  border-bottom: 1px solid #7b7b7b;
  margin-bottom: 20px;
  padding-bottom: 5px;
}

.post-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.post-item {
  width: calc(25% - 15px); /* PC：4列 */
  background: #f9f9f9;
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.3s;
}

.post-item:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.post-item a {
  display: block;
  color: inherit;
  text-decoration: none;
}

.thumb {
  width: 100%;
  height: 150px;
  overflow: hidden;
  background: #eee;
  display: flex;
  align-items: center;
  justify-content: center;
}

.thumb img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.thumb.no-image {
  font-size: 0.9rem;
  color: #666;
}

.text {
  padding: 10px;
  font-size: 1rem;
  line-height: 1.4;
}

/* --- スマホ対応 (画面幅768px以下) --- */
@media screen and (max-width: 768px) {
  .post-item {
      width: calc(50% - 10px); /* スマホ：2列 */
  }

  .thumb {
      height: 120px; /* 少し高さを縮小 */
  }

  .section-title {
      font-size: 1.3rem;
  }
}

/* --- さらに小さいスマホ対応 (画面幅480px以下) --- */
@media screen and (max-width: 480px) {
  .post-item {
      width: 100%; /* 1列表示 */
  }

  .thumb {
      height: 100px;
  }

  .text {
      font-size: 0.9rem;
  }
}