#sidebar {
    width: 0;
    overflow: hidden;
    top: 58px;
    transition: width 0.5s, opacity 0.5s;
    position: fixed;
    height: 100%;
    background-color: #333;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    z-index: 1;
    opacity: 0;
}

#sidebar.active {
    width: 180px;
    opacity: 1;
}

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

#sidebar li {
    font-family: 'Freight Sans Bold', Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: #333;
    padding: 10px;
    border-bottom: 1px solid #555;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s;
}

#sidebar li:hover {
    font-weight: bold;
}

#sidebar li.active > a {
    font-weight: bold;
}

#sidebar li:last-child {
    margin-bottom: 10px;
}

#sidebar a {
    text-decoration: none;
    color: #333;
    display: block;
    transition: background-color 0.3s;
}

.toggle-btn {
    position: absolute;
    font-size: 20px;
    cursor: pointer;
    padding: 5px 10px;
    color: #333;
    transition: left 0.5s;
}

.toggle-btn:hover {
    font-size: 20px;
    cursor: pointer;
    padding: 5px 10px;
    color: #CC000A;
    transition: left 0.5s;
}

#main-content {
    margin-left: 0px;
    transition: margin-left 0.5s;
}

#main-content.active {
    margin-left: 180px;
}

.menu-item {
    position: relative;
    background-color: #fff;
    transition: opacity 0.3s ease;
}

.menu-item ul {
    display: none;
    position: absolute;
    top: 0;
    left: 100%;
    background-color: #333;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
}

.menu-item.active ul {
    display: block;
}

#sidebar.active .menu-item {
    opacity: 1;
    pointer-events: auto;
}

.submenu {
    display: none;
    background-color: #CCC;
}

.submenu.active {
    display: block;
}

@media screen and (max-width: 920px) {
    #sidebar {
        width: 0;
    }
    #sidebar.active {
        width: 100px;
    }
    #main-content.active {
        margin-left: 100px;
    }
    #sidebar li {
        font-size: 10px;
        padding: 5px;
    }
    #sidebar li:last-child {
        margin-bottom: 5px;
    }
    #sidebar .toggle-btn {
        top: 0px;
        right: 10px;
        cursor: pointer;
        font-size: 11px;
        color: #333;
        transition: right 0.5s, top 0.5s;
    }
    #sidebar .toggle-btn:hover {
        top: 0px;
        right: 10px;
        cursor: pointer;
        font-size: 11px;
        color: #CC000A;
        transition: right 0.5s, top 0.5s;
    }

}