body {
  font-family: ui-sans-serif, system-ui;
  padding: 16px;
  background: #f6f6f6;
}

#postList .post {
  background: #fff;
  border-radius: 6px;
  padding: 10px;
  margin: 8px 0;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.post .children {
  margin-left: 20px;
  margin-top: 8px;
}

/* サイドメニュー全体 */
.sidebar {
    position: fixed;
    top: 0;
    left: -260px;
    width: 260px;
    height: 100%;
    background: #181818;
    color: #fff;
    transition: left .3s;
    padding-top: 60px;
    z-index: 1000;
}

/* メニュー背景（黒半透明、タップで閉じる） */
.sidebar-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.3);
    backdrop-filter: blur(2px);
    display: none;
    z-index: 900;
}

.sidebar.open {
    left: 0;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    padding: 16px;
    border-bottom: 1px solid #333;
    font-size: 18px;
}

.sidebar li .icon {
    margin-right: 10px;
}

/* ヘッダー */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: #111;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 800;
}

.hbg-btn {
    font-size: 24px;
    background: none;
    border: none;
    color: #fff;
}