body, html {
  margin: 0;
  height: 100%;
  font-family: sans-serif;
}
.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}
/* 上部 25% */
.header {
  flex: 0 0 25%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: #f0f0f0;
  box-sizing: border-box;
}
.header .logo {
  font-size: 1.5em;
  font-weight: bold;
}
.header nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #333;
}

/* 下部 75% */
.main {
  flex: 1;
  display: flex;
  height: 75%; /* 上部25%に対して下部75% */
}

/* 左：チラシ一覧 */
.sidebar {
  flex: 0 0 30%;
  overflow-y: auto;
  overflow-y: auto;  /* 縦スクロール */
  background: #330000;
  border-right: 1px solid #ccc;
  padding: 10px;
  box-sizing: border-box;
    /* 追加：縦スクロールでも中央寄せ */
  display: flex;
  flex-direction: column;
  align-items: center; /* 横方向中央寄せ */

}
.sidebar img {
  max-width: 90%;
  margin-bottom: 10px;
  cursor: pointer;
  border: 1px solid #ddd;
  border-radius: 4px;
  transition: transform 0.2s, border-color 0.2s;
}
.sidebar img:hover {
  transform: scale(1.05);
  border-color: #333;
}

/* 右：詳細 */
.content {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  overflow-y: auto;  /* 右側も必要に応じてスクロール可 */
  box-sizing: border-box;
  background-color: #330000;
}
.event-info {
  margin-bottom: 1em;
  padding: 0.5em;
  background: #300000;
  border-left: 4px solid #666;
}
.event-info p {
  margin: 0.3em 0;
}
.event-info ul {
  margin: 0.3em 0 0 1.5em;
}