.nav {
    height: 100vh;
    display: flex;
    position: absolute;
    left: 0;
    background-color: var(--FillColor2);
}
.task {
    width: 320px;
    height: 100%;
    background-color: var(--FillColor6);
    padding: 16px 8px 16px 8px;
    padding-bottom: var(--HeaderHeight);;
    border-right: 1px solid var(--BorderColor1);
    display: flex;
    flex-direction: column;
}

.openEdit {
    position: absolute;
    max-width: 868px;
    width: calc(100vw - 400px);
    display: flex;
    align-items: center;
    left: 400px;
    height: calc(100vh - var(--HeaderHeight));
    transition: all 0.3s;
}
.openIcon {
    width: 20px;
    height: 96px;
    left: 399px;
    top: calc(50% - 96px / 2);
    background-color: var(--PrimaryColor1);
    border-radius: 0px 20px 20px 0px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
    cursor: pointer;
    margin-left: -1px;
}
.close {
    z-index: 0;
}
.open {
    left: 1230px;
}
.close {
    rotate: 180deg;
}
.mask {
    position: absolute;
    background-color: rgba(0, 0, 0, 0.45);
    width: 100vw;
    height: calc(100vh - var(--HeaderHeight));
    z-index: 1;
}
