/* コラムページ固有のスタイル */
.page-header {
  background-color: #001f3f;
  /* VIKINGS Navy */
  color: #fff;
  text-align: center;
  padding: 60px 20px;
  margin-top: 80px;
  /* ヘッダーの高さ分 */
  border-bottom: 5px solid #ffcc00;
  /* VIKINGS Yellow accent */
}

.page-header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.column-container {
  max-width: 1000px;
  margin: 40px auto;
  padding: 0 20px;
}

.column-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.column-card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
}

.column-card:hover {
  transform: translateY(-5px);
}

.column-img {
  width: 100%;
  height: 200px;
  background-color: #eee;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
}

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

.column-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.column-date {
  font-size: 0.85rem;
  color: #777;
  display: block;
  margin-bottom: 10px;
}

.column-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
  line-height: 1.4;
  color: #001f3f;
  /* headings in Navy */
  font-weight: bold;
}

.column-excerpt {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 15px;
  line-height: 1.5;
  flex-grow: 1;
}

.read-more {
  display: inline-block;
  color: #df2121;
  /* VIKINGS red */
  text-decoration: none;
  font-weight: bold;
  font-size: 0.9rem;
  align-self: flex-start;
}

.read-more:hover {
  text-decoration: underline;
}

/* レスポンシブ対応 - スマートフォン用 */
@media (max-width: 768px) {
  .page-header {
    margin-top: 0;
    padding: 40px 15px;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .column-container {
    margin: 20px auto;
  }

  .column-grid {
    grid-template-columns: 1fr;
    /* 1列に */
    gap: 20px;
  }

  .column-img {
    height: 180px;
  }
}