#navigation-panel {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100%;
    background: white;
    transition: left 0.3s;
    z-index: 1000;
}

#navigation-header div[onclick] {
    cursor: pointer;
}

#navigation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #ccc;
}

#navigation-content {
    overflow: auto;
    height: calc(100% - 50px);
}

#navigation-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#navigation-content li a {
    display: flex;
    align-items: center;
    padding: 10px;
    padding-left: calc(10px + (var(--depth, 0) * 20px));
    border-bottom: 1px solid #eee;
    color: #333;
    text-decoration: none;
}

#navigation-content li a svg {
    width: 16px;
    height: 16px;
    margin-right: 10px;
}

#navigation-content li a:hover {
    background: #f0f0f0;
}

#navigation-content ul.nested {
    display: none;
    list-style: none;
    padding-left: 0;
}

#navigation-content li.open > ul.nested {
    display: block;
}

#navigation-content li a svg.icon-tabler-chevron-right {
    transition: transform 0.2s;
}

#navigation-content li.open > a > svg.icon-tabler-chevron-right {
    transform: rotate(90deg);
}