/* Sliding Squares Loading Spinner
   Inspired by https://www.uplabs.com/posts/slidin-squares-loader by Vitaly Silkin 
   Implemented in CSS by Tom Adey 
   Quelle https://codepen.io/tomad8/pen/VwaPOXR
 */

body,
html,
on-load {
  height: 100%;
}
on-load{
  display: flex;
  justify-content: center;
  align-items: center;
}

.loadingspinner {
  --square: 26px;
  --offset: 30px;

  --duration: 2.4s;
  --delay: 0.2s;
  --timing-function: ease-in-out;

  --in-duration: 0.4s;
  --in-delay: 0.1s;
  --in-timing-function: ease-out;

  width: calc( 3 * var(--offset) + var(--square));
  height: calc( 2 * var(--offset) + var(--square));
  padding: 0px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 10px;
  margin-bottom: 30px;
  position: relative;
}

.loadingspinner div {
  display: inline-block;
  background: darkorange;
  /*background: var(--text-color);*/
  /*box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.4);*/
  border: none;
  border-radius: 2px;
  width: var(--square);
  height: var(--square);
  position: absolute;
  padding: 0px;
  margin: 0px;
  font-size: 6pt;
  color: black;
}

.loadingspinner #square1 {
  left: calc( 0 * var(--offset) );
  top:  calc( 0 * var(--offset) );
  animation: square1 var(--duration) var(--delay) var(--timing-function) infinite,
             squarefadein var(--in-duration) calc(1 * var(--in-delay)) var(--in-timing-function) both;
}

.loadingspinner #square2 {
  left: calc( 0 * var(--offset) );
  top:  calc( 1 * var(--offset) );
  animation: square2 var(--duration) var(--delay) var(--timing-function) infinite,
            squarefadein var(--in-duration) calc(1 * var(--in-delay)) var(--in-timing-function) both;
}

.loadingspinner #square3 {
  left: calc( 1 * var(--offset) );
  top:  calc( 1 * var(--offset) );
  animation: square3 var(--duration) var(--delay) var(--timing-function) infinite,
             squarefadein var(--in-duration) calc(2 * var(--in-delay)) var(--in-timing-function) both;
}

.loadingspinner #square4 {
  left: calc( 2 * var(--offset) );
  top:  calc( 1 * var(--offset) );
  animation: square4 var(--duration) var(--delay) var(--timing-function) infinite,
             squarefadein var(--in-duration) calc(3 * var(--in-delay)) var(--in-timing-function) both;
}

.loadingspinner #square5 {
  left: calc( 3 * var(--offset) );
  top:  calc( 1 * var(--offset) );
  animation: square5 var(--duration) var(--delay) var(--timing-function) infinite,
             squarefadein var(--in-duration) calc(4 * var(--in-delay)) var(--in-timing-function) both;
}

@keyframes square1 {
  0%      {left: calc( 0 * var(--offset) ); top: calc( 0 * var(--offset) ); }
  8.333%  {left: calc( 0 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  100%    {left: calc( 0 * var(--offset) ); top: calc( 1 * var(--offset) ); }
}

@keyframes square2 {
  0%      {left: calc( 0 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  8.333%  {left: calc( 0 * var(--offset) ); top: calc( 2 * var(--offset) ); }
  16.67%  {left: calc( 1 * var(--offset) ); top: calc( 2 * var(--offset) ); }
  25.00%  {left: calc( 1 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  83.33%  {left: calc( 1 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  91.67%  {left: calc( 1 * var(--offset) ); top: calc( 0 * var(--offset) ); }
  100%    {left: calc( 0 * var(--offset) ); top: calc( 0 * var(--offset) ); }
}

@keyframes square3 {
  0%,100% {left: calc( 1 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  16.67%  {left: calc( 1 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  25.00%  {left: calc( 1 * var(--offset) ); top: calc( 0 * var(--offset) ); }
  33.33%  {left: calc( 2 * var(--offset) ); top: calc( 0 * var(--offset) ); }
  41.67%  {left: calc( 2 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  66.67%  {left: calc( 2 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  75.00%  {left: calc( 2 * var(--offset) ); top: calc( 2 * var(--offset) ); }
  83.33%  {left: calc( 1 * var(--offset) ); top: calc( 2 * var(--offset) ); }
  91.67%  {left: calc( 1 * var(--offset) ); top: calc( 1 * var(--offset) ); }
}

@keyframes square4 {
  0%      {left: calc( 2 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  33.33%  {left: calc( 2 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  41.67%  {left: calc( 2 * var(--offset) ); top: calc( 2 * var(--offset) ); }
  50.00%  {left: calc( 3 * var(--offset) ); top: calc( 2 * var(--offset) ); }
  58.33%  {left: calc( 3 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  100%    {left: calc( 3 * var(--offset) ); top: calc( 1 * var(--offset) ); }
}

@keyframes square5 {
  0%      {left: calc( 3 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  50.00%  {left: calc( 3 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  58.33%  {left: calc( 3 * var(--offset) ); top: calc( 0 * var(--offset) ); }
  66.67%  {left: calc( 2 * var(--offset) ); top: calc( 0 * var(--offset) ); }
  75.00%  {left: calc( 2 * var(--offset) ); top: calc( 1 * var(--offset) ); }
  100%    {left: calc( 2 * var(--offset) ); top: calc( 1 * var(--offset) ); }
}

@keyframes squarefadein {
  0%      {transform: scale(0.75); opacity: 0.0;}
  100%    {transform: scale(1.0); opacity: 1.0;}
}