.category-item {
    width: 120px;
    padding: 5px 10px;
    cursor: pointer;
    border-bottom: 1px solid #eee;
    font-size: 14px;
    /* font-family: 'Courier New', Courier, monospace; */
    font-family: 'Times New Roman', Times, serif;
}
.category-item:hover { background-color: #e0e0e0; }

/* -- ◈ -- */

.category-item[data-category="Biology"] {
    background: linear-gradient(to right, #e8f5e9, #ffffff);
    background-image: url("../../../../Assets/Graphics/Pictures/Background/tienko-dima-uYoVf9I6ANI-unsplash.jpg");
    /* color: #c0f3c3;
    text-shadow: 1px 1px 2px #000000; */
    color: #00d00a;
    /* color: #00e30b; */
    font-family: "Palatino Linotype", serif;
    border-left: 4px solid #9ec60b;
    /* border-left: 4px solid #66bb6a; */
    box-shadow: 0 2px 4px rgba(102, 187, 106, 0.5);
}
.category-item[data-category="Biology"]:hover {
    background: #c8e6c9;
    background-image: url("../../../../Assets/Graphics/Pictures/Background/tienko-dima-uYoVf9I6ANI-unsplash.jpg");
    color: #1b2702;
    background-position: 40%;
    transform: translateX(1px);
}
/* .left-bar[data-current-category="Biology"] {
    border-right: 2px double #a5d6a7;
}
.left-bar[data-current-category="Biology"] .node-label {
    font-weight: bold;
} */

/* .category-item[data-category="Cryptography"]{
    font-family: 'Times New Roman', Times, serif;
    letter-spacing: 1px;
    color: gray;
} */


.category-item[data-category="Astronomy"]{
    /* margin-top: 80px;  */
    /* border-top: 1px solid #333;
    border-bottom: 1px solid #333; */
    /* padding-top: 10px;  */
    /* background-color: rgb(228, 228, 228); */
    /* color: #ffffff; */
    /* color: black; */
    color: rgb(255, 255, 255);
    /* font-family: "Megrim", system-ui; */
    /* font-family: 'Times New Roman', Times, serif; */
    /* text-shadow: 
        -1px -1px 1px #ffffff,
        1px 1px 2px #3b3b3b,
        1px 1px 2px #3b3b3b; */
        background-color: white;
        background-image: url(../../../../Assets/Graphics/Pictures/Astro/noao-ngc7023.jpg);
        background-size: 800px;
    border-left: 4px solid #36618e;
    text-shadow: 1px 1px 2px #a8a8a8;
    font-family: "Cinzel", serif;
    /* font-size: 16px; */
    font-variant: small-caps; 
    /* text-align: center;  */
    letter-spacing: 2px;
}
.category-item[data-category="Astronomy"]:hover{
    /* border-left: 2px solid #e7e7e7;
    border-right: 2px solid #e7e7e7; */
    color: #021027;
    text-shadow: 1px 1px 2px #8b8f9d;
    background-position: center;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
    transform: translateX(1px);
}


/* .category-item[data-category="Math"]{
    border-left: 4px solid #b9b9b9;
    font-family: "Cinzel", serif;
} */


/* .category-item[data-category="{Computer Science}"] {
    color: #a2a2a2;
    font-family: "Silkscreen", sans-serif;
    border-left: 4px solid #bdcac7;
    letter-spacing: 0px;
    text-transform: uppercase;
    font-size: 9px;
}
.category-item[data-category="{Computer Science}"]:hover {
    color: #8b8b8b;
} */


.category-item[data-category="--"]{
    background-color: maroon;
    /* background-color: red; */
}