.system-navigation {
    width: 54px;
    flex-shrink: 0;
    height: 100%;
    background-color: white;

    display: flex;
    flex-direction: column;

    .logo {
        height: 32px;
        flex-shrink: 0;
        display: flex;
        align-items: center;

        justify-content: center;
        cursor: pointer;

        >img {
            width: 50px;
            margin: 0 2px;
        }
    }

    .main {
        width: 54px;
        flex: 1 1 auto;
        background-color: #333;

        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .left-tool-item {
        width: 100%;
        color: #999;
        font-size: 26px;
        text-align: center;
        height: 54px;
        position: relative;

        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;

        .indicator {
            position: absolute;
            right: -6px;
            font-size: 18px;
            transform: rotate(90deg);
            display: none;
        }

        &:hover {
            color: white;
        }

        &.active {
            color: #26c2ff;

            .indicator {
                display: block;
            }
        }
    }
}