.song-sidebar-card .card-body {
    padding: 0.75rem;
}

.song-tree {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.song-tree-row {
    display: flex;
    align-items: center;
    gap: 4px;
    min-height: 32px;
    padding: 7px 10px;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.18s ease, transform 0.12s ease;
    user-select: none;
}

.song-tree-row:hover {
    background: rgba(25, 135, 84, 0.08);
}

.song-tree-row.is-active {
    background: rgba(25, 135, 84, 0.14);
}

.song-tree-row.is-level-1 {
    padding-left: 10px;
}

.song-tree-row.is-level-2 {
    padding-left: 28px;
}

.song-tree-row.is-level-3 {
    padding-left: 46px;
}

.song-tree-row.is-level-4 {
    padding-left: 66px;
}

.song-tree-toggle {
    width: 18px;
    min-width: 18px;
    text-align: center;
    color: #6c757d;
    font-size: 12px;
    line-height: 1;
}

.song-tree-spacer {
    width: 18px;
    min-width: 18px;
}

.song-tree-label {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.song-tree-title {
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-weight: 600;
    font-size: 0.95rem;
}

.song-tree-meta-badge {
    flex: 0 0 auto;
}

.song-tree-section {
    margin-top: 6px;
}

.song-tree-section-label {
    padding: 8px 10px 4px 10px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    color: #6c757d;
    letter-spacing: 0.04em;
}

.compact-audio-player audio {
    display: block;
    width: 100%;
    height: 32px;
}