.fullscreen {
  position: fixed;
  inset: 0;
}

.primary-header[data-fullscreen-mode]::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgb(0, 0, 0, 0.85);
}

.margin-bottom-600 {
  margin-bottom: var(--size-600);
}

:root {
  --field-size: 19;
}

.snake-field {
  display: grid;
  grid-template-rows: repeat(var(--field-size), 1fr);
  grid-template-columns: repeat(var(--field-size), 1fr);
  width: 98vmin;
  height: 98vmin;
  margin: auto;
  background-color: hsl(30, 49%, 38%);
  outline: 1vmin solid hsl(30, 49%, 20%);
}

.snake-grid{
  display: grid;
  grid-template-columns: 4fr 1fr;
  align-items: center;
}

.snake-grid > img {
min-width: 160px;
max-width: 200px;
}

.game-over-poster,
.new-record-poster {
  display: none;
  position: fixed;
  inset: 0;
  margin: auto;
  padding: var(--size-600);
  width: max-content;
  height: min-content;
  background-color: hsl(30, 49%, 20%);
  opacity: 0.7;
  border-radius: 1rem;
  box-shadow: 0 0 1rem 0.75rem rgba(0, 0, 0, 0.2);
}
.game-over-display {
  display: block;
}

.score {
  position: fixed;
  inset: 0;
  margin: auto;
  width: min-content;
  height: min-content;
  visibility: hidden;
}

.score[data-how-many-mouses] {
  visibility: visible;
  animation: how-many 1500ms ease-in-out;
}

@keyframes how-many {
  0% {
    opacity: 0.8;
  }
  100% {
    transform: scale(5);
    opacity: 0;
  }
}

.snake,
.snake-head-up,
.snake-head-right,
.snake-head-down,
.snake-head-left,
.snake-body-N,
.snake-body-UL,
.snake-body-UR,
.snake-body-BR,
.snake-body-BL,
.tail-right,
.tail-left,
.tail-up,
.tail-down {
  background-color: hsl(86, 53%, 51%);
  border: 0.25vmin solid hsl(87, 39%, 28%);
}

.brown-snake {
  background-color: hsl(30, 49%, 20%);
  border: 0.25vmin solid hsl(30, 49%, 38%);
}

.snake-head-up,
.snake-head-right,
.snake-head-down,
.snake-head-left {
  position: relative;
}

.snake-head-up {
  border-radius: 100% 100% 0 0;
}
.snake-head-right {
  border-radius: 0 100% 100% 0;
}
.snake-head-down {
  border-radius: 0 0 100% 100%;
}
.snake-head-left {
  border-radius: 100% 0 0 100%;
}

.snake-head-up::after,
.snake-head-down::after {
  content: '••';
  position: absolute;
  width: min-content;
  height: min-content;
  inset: 0;
  margin: auto;
  color: var(--color-main-body);
}

.snake-head-right::after,
.snake-head-left::after {
  content: '••';
  position: absolute;
  width: min-content;
  height: min-content;
  inset: 0;
  margin: auto;
  transform: rotate(90deg);
  color: var(--color-main-body);
}

.snake-body-UL {
  border-radius: 100% 0 0 0;
}

.snake-body-UR {
  border-radius: 0 100% 0 0;
}

.snake-body-BR {
  border-radius: 0 0 100% 0;
}

.snake-body-BL {
  border-radius: 0 0 0 100%;
}

.tail-right {
  border-radius: 0% 100% 100% 0% / 0% 50% 50% 100%;
}

.tail-left {
  border-radius: 100% 0% 0% 100% / 50% 100% 0% 50%;
}

.tail-up {
  border-radius: 50% 50% 100% 0% / 100% 100% 0% 0%;
}

.tail-down {
  border-radius: 0% 100% 50% 50% / 0% 0% 100% 100%;
}

.mouse {
  background-image: url(../images/svg/mouse.svg);
  /* background-color: orangered;
  border-radius: 40%;
  border: 0.25vmin solid hsl(13, 99%, 15%); */
}

.fullscreen-icon {
  width: calc(1.5 * var(--font-size-big));
  aspect-ratio: 1;
  object-fit: contain;
  margin-inline: auto;
  fill: var(--color-text-white);
  cursor: pointer;
}
.fullscreen-icon:hover {
  fill: var(--color-main-accent);
}