body {
  --background-color: #ede6e3;
  --wall-color: #36382e;
  --joystick-color: #210124;
  --joystick-head-color: #f06449;
  --ball-color: #f06449;
  --end-color: #7d82b8;
  --text-color: #210124;

  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background-color);
}

html,
body {
  height: 100%;
  margin: 0;
}

#center {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

#game {
  display: grid;
  grid-template-columns: auto 150px;
  grid-template-rows: auto auto auto;
  gap: 20px;
  perspective: 600px;
}

#maze {
  position: relative;
  grid-row: 1 / -1;
  grid-column: 1;
  width: 350px;
  height: 315px;
  display: flex;
  justify-content: center;
  align-items: center;
}

#end {
  width: 65px;
  height: 65px;
  border: 5px dashed var(--end-color);
  border-radius: 50%;
}

#joystick {
  position: relative;
  background-color: var(--joystick-color);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 10px 50px;
  grid-row: 2;
}

#joystick-head {
  position: relative;
  background-color: var(--joystick-head-color);
  border-radius: 50%;
  width: 20px;
  height: 20px;
  cursor: grab;

  animation-name: glow;
  animation-duration: 0.6s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function: ease-in-out;
  animation-delay: 4s;
}

@keyframes glow {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.2);
  }
}

.joystick-arrow:nth-of-type(1) {
  position: absolute;
  bottom: 55px;

  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-bottom: 10px solid var(--joystick-color);
}

.joystick-arrow:nth-of-type(2) {
  position: absolute;
  top: 55px;

  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-top: 10px solid var(--joystick-color);
}

.joystick-arrow:nth-of-type(3) {
  position: absolute;
  left: 55px;

  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;

  border-left: 10px solid var(--joystick-color);
}

.joystick-arrow:nth-of-type(4) {
  position: absolute;
  right: 55px;

  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;

  border-right: 10px solid var(--joystick-color);
}

#note {
  grid-row: 3;
  grid-column: 2;
  text-align: center;
  font-size: 0.8em;
  color: var(--text-color);
  transition: opacity 2s;
}

a:visited {
  color: inherit;
}

.ball {
  position: absolute;
  margin-top: -5px;
  margin-left: -5px;
  border-radius: 50%;
  background-color: var(--ball-color);
  width: 10px;
  height: 10px;
}

.wall {
  position: absolute;
  background-color: var(--wall-color);
  transform-origin: top center;
  margin-left: -5px;
}

.wall::before,
.wall::after {
  display: block;
  content: "";
  width: 10px;
  height: 10px;
  background-color: inherit;
  border-radius: 50%;
  position: absolute;
}

.wall::before {
  top: -5px;
}

.wall::after {
  bottom: -5px;
}

.black-hole {
  position: absolute;
  margin-top: -9px;
  margin-left: -9px;
  border-radius: 50%;
  background-color: black;
  width: 18px;
  height: 18px;
}

#level-selection {
  grid-row: 1;
  grid-column: 2;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.level-button {
  padding: 10px;
  background-color: var(--joystick-color);
  color: var(--background-color);
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.level-button:hover {
  transform: scale(1.05);
}

.level-button.active {
  background-color: var(--joystick-head-color);
  font-weight: bold;
}

@media (max-width: 520px) {
  html {
    overflow-x: hidden;
  }

  body {
    overflow-x: hidden;
    overflow-y: auto;
  }

  #center {
    height: 100%;
    box-sizing: border-box;
    align-items: center;
    justify-content: center;
    padding: 8px 0;
    overflow: hidden;
  }

  #game {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto;
    gap: 10px;
    padding: 0;
    width: 100%;
    justify-items: center;
  }

  /* Bigger joystick for touch */
  #joystick {
    width: 72px;
    height: 72px;
    margin: 6px auto;
  }

  #joystick-head {
    width: 28px;
    height: 28px;
  }

  #maze {
    grid-row: 1;
    grid-column: 1;
  }

  #level-selection {
    grid-row: 2;
    grid-column: 1;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  #joystick {
    grid-row: 3;
    grid-column: 1;
    margin: 8px auto;
  }

  #note {
    grid-row: 4;
    grid-column: 1;
    text-align: center;
    margin-bottom: 12px;
  }
}