:root {
  --viewing-area-padding: 32px;
  --viewing-cell-size: 200px;
  --robot-size-rel: 0.5;
  --cell-wall-border: 16px solid black;
}

main {
  max-width: 800px;
  width: 100%;
  overflow: hidden;
  z-index: 1;
  display: flex;
  flex-direction: row;
  padding: 32px;
  gap: 32px;
  align-items: stretch;
}
main section {
  flex: 1 1 0px;
}

#control-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
#control-panel .minicard {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  background-color: lightgray;
  border-radius: 16px;
}

#viewing-panel {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 32px;
}
#viewing-area-box {
  flex-grow: 1;
}
#viewing-area {
  background-color: whitesmoke;
  padding: var(--viewing-area-padding);
  border-radius: var(--viewing-area-padding);
  position: relative;
}
#viewing-cell {
  background-color: white;
  width: var(--viewing-cell-size);
  height: var(--viewing-cell-size);
}

#viewing-cell.cell-start {
  background-color: lightblue;
}
#viewing-cell.cell-end {
  background-color: lightsalmon;
}
#viewing-cell.wall-front {
  border-top: var(--cell-wall-border);
}
#viewing-cell.wall-left {
  border-left: var(--cell-wall-border);
}
#viewing-cell.wall-right {
  border-right: var(--cell-wall-border);
}
#viewing-cell.wall-back {
  border-bottom: var(--cell-wall-border);
}

#robot {
  position: absolute;
  width: calc(var(--viewing-cell-size) * var(--robot-size-rel));
  height: calc(var(--viewing-cell-size) * var(--robot-size-rel));
  top: calc(var(--viewing-cell-size) / 2 + var(--viewing-area-padding));
  left: calc(var(--viewing-cell-size) / 2 + var(--viewing-area-padding));
  translate: -50% -50%;
  background-color: black;
  clip-path: polygon(10% 0%, 30% 0%, 35% 5%, 65% 5%, 70% 0%, 85% 0%, 100% 15%, 100% 85%, 85% 100%, 70% 100%, 65% 95%, 35% 95%, 30% 100%, 10% 100%, 0% 90%, 0% 70%, 5% 65%, 5% 35%, 0% 30%, 0% 10%);
  rotate: -90deg;
}


@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.gradient-bg.inner {
  --size: 750px;
  --speed: 20s;
  --easing: cubic-bezier(0.8, 0.2, 0.2, 0.8);
  width: var(--size);
  height: var(--size);
  filter: blur(calc(var(--size) / 5));
  background-image: linear-gradient(#4377ef, #7befd0);
  animation: rotate var(--speed) var(--easing) alternate infinite;
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
}
.gradient-bg.outer {
  background-color: #071c39;
  position: absolute;
  inset: 0;
  display: flex;
  place-content: center;
  align-items: center;
  overflow: hidden;
}
.gradient-bg {
  transition: all 0.5s ease-out;
}