/* ── 사이드바 최상단 헤더 ── */
.sidebar-header {
    padding: 8px 12px;
    background: #1f1f1c;
}

.header-btn {
    width: 100%;
    display: flex;
    align-items: center;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
}

.header-arrow {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 6px;
    background: url("/assets/icon/chevron-down.svg") no-repeat center/contain;
    transition: transform .2s ease;
}

/* 사이드바가 접힌 상태에서 화살표 회전 */
.sidebar-collapsed .header-arrow {
    transform: rotate(-90deg);
}

.header-title {
    color: #ccc;
    font-size: 12px;
    font-weight: bold;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 부제목 */
.sidebar-sub {
    padding: 4px 12px;
    background: #272822;
    color: #aaa;
    font-size: 12px;
    font-weight: 800;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-sub .header-arrow {
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-right: 6px;
    background: url("/assets/icon/arrow-down.svg") no-repeat center/contain;
    transition: transform .2s ease;
}