/* 全体レイアウト */
.content {
  display: grid;
  grid-template-columns: 3fr 1fr;
  gap: 2rem;
  margin: 2rem auto;
  max-width: 1200px;
  padding: 0 1rem;
}

/* ヘッダー */
.site-header {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1a1a4f;
  padding: 1rem 2rem;
  color: white;
}
.site-header .logo a {
  color: white;
  text-decoration: none;
  font-size: 1.8rem;
  font-weight: bold;
}

/* カード型レイアウト */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.post-card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.2s;
}
.post-card:hover {
  transform: translateY(-5px);
}
.post-thumbnail img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.post-content {
  padding: 1rem;
}
.post-date {
  display: block;
  font-size: 0.85rem;
  color: #888;
  margin-bottom: 0.5rem;
}
.post-title {
  font-size: 1.2rem;
}

/* サイドバー */
.sidebar {
  background: #f8f8f8;
  padding: 1rem;
  border-radius: 8px;
}
.recommend-list {
  list-style: none;
  padding: 0;
}
.recommend-list li {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}
.recommend-list img {
  width: 60px;
  height: 40px;
  object-fit: cover;
  margin-right: 0.5rem;
  border-radius: 5px;
}