.sidebar {
    width: 200px;
    font-size: 12px;
    padding: 16px;
    background-color: rgba(0, 0, 0, 0.4); /* 半透明で夜空と調和 */
    color: white;
    border-radius: 12px;
    backdrop-filter: blur(4px);
    font-family: var(--font-adobe-kinuta);
}

.sidebar-h4 {
    font-size: 16px;
    color: #fff;
    border-bottom: 1px solid #ccc;
    margin-bottom: 8px;
    padding-bottom: 4px;
}

.sidebar ul {
    margin-bottom: 24px;
    padding-left: 0;
}

.sidebar li {
    list-style: none;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 8px 8px;
    margin: 6px 0;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.sidebar li:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.sidebar a {
    color: white;
    text-decoration: none;
}