body {
    margin: 0;
    overflow: hidden;
    background: black;
}

#canvas2d,
#canvas3d,
#help {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}

#canvas2d {
    z-index: 1;
}

#help {
    z-index: 2;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
}

#help.hidden {
    display: none;
}

#help.mobile .desktop, #help.desktop .mobile {
    display: none;
}

.popup {
    margin: 20px;
    max-height: 90%;
    overflow-y: auto;

    background: #222;
    border: 2px #ddd solid;
    border-radius: 40px;
    padding: 20px;
    color: #ddd;
}
.popup, .popup button {
    font: 20px 'Satoshi', sans-serif;
}

.popup h1 {
    color: #c8c864;
}

.popup>div {
    margin-bottom: 25px;
}

.popup>div>b {
    color: #96c864;
}

.popup li {
    display: flex;
    margin: 10px 0;
    gap: 10px;
    align-items: center;
}

.popup .powerup {
    display: block;
    width: 1.1em;
    border-radius: 50%;
    text-align: center;
    color: #222;
}

.popup .powerup.plus {
    background: #ff4;
}

.popup .powerup.minus {
    background: #4f4;
}

.popup .key {
    border: 1px #aaa solid;
    border-radius: 7px;
    padding: 5px;
    min-width: 1em;
    text-align: center;
}

.popup button {
    display: block;
    margin: 0 auto;
    background: #c8af64;
    padding: 10px 30px;
    border-radius: 7px;
    color: #222;
 
}