.upgrades-tree-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 95.4%;
    height: 71.8%;
    background-color: white;
    border: 0.05vw solid black;
    border-radius: 0.3vw;
    display: none;
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 1000;
    padding: 1vw;
    grid-template-rows: auto 1fr auto;
    grid-template-columns: 1fr;
    align-items: center;
}

.upgrades-tree-container h2 {
    margin-top: 0;
    padding: 0.5vw;
    padding-bottom: 1vw;
    text-align: center;
    width: 100%;
    position: sticky;
    top: 0;
    background-color: white;
    z-index: 1010;
    grid-row: 1;
}

.close-button {
    position: absolute;
    top: 0.5vw;
    right: 0.5vw;
    padding: 0.2vw 0.5vw;
    cursor: pointer;
    font-size: 1vw;
    border: 0.05vw solid #ccc;
    border-radius: 0.2vw;
    background-color: black;
    z-index: 1010;
}

.close-button:hover {
    background-color: gray;
}

#upgradesListInner {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: min-content;
    gap: 2vw;
    align-items: center;
    padding-top: 2vw;
    overflow-x: auto;
    height: calc(100% - 1vw);
    grid-row: 2;
}

.upgrade-level-column {
    display: flex;
    flex-direction: column;
    gap: 1vw;
    align-items: center;
}

.upgrade-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.upgrade-button {
    background: none;
    border: 0.05vw solid #ccc;
    border-radius: 0.3vw;
    padding: 0.3vw;
    cursor: pointer;
    width: 6vw;
    height: 6vw;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.upgrade-button img {
    display: block;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#upgradeDescriptionContainer {
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 0.5vw 1vw;
    border-radius: 0.3vw;
    font-size: 0.9vw;
    text-align: center;
    position: absolute;
    bottom: 1vw;
    left: 50%;
    transform: translateX(-50%);
    width: fit-content;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    z-index: 1020;
}

#upgradeDescriptionContainer.visible {
    opacity: 1;
    visibility: visible;
}

.bought-indicator {
    background-color: gold;
    color: black;
    padding: 0.2vw 0.4vw;
    border-radius: 0.2vw;
    font-size: 0.7vw;
    margin-top: 0.3vw;
    display: none;
}

.upgrade-item.bought .bought-indicator {
    display: block;
}

.price {
    font-size: 0.8vw;
    margin-top: 0.3vw;
    display: flex;
    align-items: center;
}

.prestige-icon {
    width: 0.8vw;
    height: 0.8vw;
    margin-left: 0.2vw;
    vertical-align: middle;
}

.upgrade-button.researched {
    border-color: green;
}

.upgrade-button.not-researched {
    border-color: red;
}