Delay animation, make it go the other direction after Xs - css

Question

I'm getting more into animation property and keyframes. Got this loader thing I'm working on. I'm having a hard time getting to go from right to left with animation-delay and multiple animations approach.
This one dot is supposed to go from left > right, right > left.
Stop there for until the other dots pass back the other direction and start again, stop there until the other dots pass back....
My approach is:
Full solution at jsfiddle
body {
background-color: #111111;
}
[data-am-animation] {
box-sizing: border-box;
background-color: white;
flex-direction: row;
margin: 30px;
position: relative;
height: 180px;
width: 120px;
}
[data-am-animation] .dot {
background-color: deepskyblue;
position: absolute;
height: 30px;
width: 30px;
border-radius: 50%;
}
[data-am-animation] .dot.down {
left: 30px;
animation-name: load-down;
animation-duration: 5s;
animation-timing-function: linear;
animation-direction: alternate;
animation-iteration-count: infinite;
}
[data-am-animation] .dot.up {
left: 60px;
animation-name: load-up;
animation-duration: 5s;
animation-timing-function: linear;
animation-direction: alternate;
animation-iteration-count: infinite;
}
[data-am-animation] .dot.through {
left: 0;
top: 50%;
margin-top: -15px;
/*animation-name: load-through;
animation-duration: ($animation-speed / 2.6);
animation-timing-function: linear;
animation-direction: alternate;
animation-iteration-count: infinite;
animation-delay: ($animation-speed / 1.3);*/
animation: load-through-right 1.66667s linear infinite 3.125s, load-through-left 1.66667s linear infinite 3.125s;
}
/* keyframes start */
#keyframes load-down {
0% {
transform: translate(0, 0);
background-color: deepskyblue;
}
100% {
transform: translate(0, 150px);
background-color: deeppink;
}
}
#keyframes load-up {
0% {
transform: translate(0, 150px);
background-color: deeppink;
}
100% {
transform: translate(0, 0);
background-color: deepskyblue;
}
}
#keyframes load-through-right {
0% {
transform: translate(0, 0);
background-color: deepskyblue;
}
100% {
transform: translate(90px, 0);
background-color: deeppink;
}
}
#keyframes load-through-left {
0% {
transform: translate(90px, 0);
background-color: deeppink;
}
100% {
transform: translate(0, 0);
background-color: deepskyblue;
}
}
/* keyframes end */
<div data-am-animation>
<div class="dot through"></div>
<div class="dot down"></div>
<div class="dot up"></div>
</div>
any suggestions for math improvements, I'm all for it.
EDIT
Final result

Answer 1

Here is an approach with single animation. Let me know if it's a direction for you or may I didn't understand your wish.
body {
background-color: #111111;
}
[data-am-animation] {
box-sizing: border-box;
background-color: white;
flex-direction: row;
margin: 30px;
position: relative;
height: 180px;
width: 120px;
}
[data-am-animation] .dot {
background-color: deepskyblue;
position: absolute;
height: 30px;
width: 30px;
border-radius: 50%;
}
[data-am-animation] .dot.down {
left: 30px;
animation-name: load-down;
animation-duration: 5s;
animation-timing-function: linear;
animation-direction: alternate;
animation-iteration-count: infinite;
}
[data-am-animation] .dot.up {
left: 60px;
animation-name: load-up;
animation-duration: 5s;
animation-timing-function: linear;
animation-direction: alternate;
animation-iteration-count: infinite;
}
[data-am-animation] .dot.through {
left: 0;
top: 50%;
margin-top: -15px;
/*animation-name: load-through;
animation-duration: ($animation-speed / 2.6);
animation-timing-function: linear;
animation-direction: alternate;
animation-iteration-count: infinite;
animation-delay: ($animation-speed / 1.3);*/
animation: load-through-right 5s linear infinite;
}
/* keyframes start */
#keyframes load-down {
0% {
transform: translate(0, 0);
background-color: deepskyblue;
}
100% {
transform: translate(0, 150px);
background-color: deeppink;
}
}
#keyframes load-up {
0% {
transform: translate(0, 150px);
background-color: deeppink;
}
100% {
transform: translate(0, 0);
background-color: deepskyblue;
}
}
#keyframes load-through-right {
0%, 20% {
transform: translate(0, 0);
background-color: deepskyblue;
}
50%, 70% {
transform: translate(90px, 0);
background-color: deeppink;
}
}
#keyframes load-through-left {
0% {
transform: translate(90px, 0);
background-color: deeppink;
}
100% {
transform: translate(0, 0);
background-color: deepskyblue;
}
}
/* keyframes end */
<div data-am-animation>
<div class="dot through"></div>
<div class="dot down"></div>
<div class="dot up"></div>
</div>