:root {
  --black: #151515;
  --third: #8dcbf5;
  --grid-size: 4;
  --cell-size: 16vmin;
  --cell-gap: 2vmin;
}

@keyframes show {
  0% {
    opacity: 0.5;
    transform: scale(0);
  }
}

/* BASIC STYLES */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
  -webkit-user-select: none; /* Safari */
  -ms-user-select: none; /* IE 10 and IE 11 */
  user-select: none; /* Standard syntax */
}
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  color: var(--black);
}
.container {
  max-width: 1080px;
  margin: 0 auto;
}
header,
footer {
  z-index: 5;
}
header {
  padding: var(--cell-gap);
}
h1 {
  font-size: 1.8rem;
  margin: 0;
}

/* HEADER */
header {
  position: absolute;
  width: 100%;
  height: 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* FOOTER */
footer .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.rating-btn,
footer p,
footer a,
footer a img {
  font-size: 1em;
  color: var(--black);
  text-decoration: none;
  cursor: pointer;
  transition: all 200ms;
}
footer a img {
  height: 32px;
  padding: 4px 8px;
  border-radius: 8px;
}
.rating-btn:hover,
footer p:hover,
footer a:hover {
  color: var(--third);
}
footer a img:hover {
  background-color: var(--third);
}

/* GAME BOARD STYLES */
main {
  margin-top: 24px;
  background-color: #bbb;
  border-radius: 1vmin;
  position: relative;
}
.game-board {
  display: grid;
  grid-template-columns: repeat(var(--grid-size), var(--cell-size));
  grid-template-rows: repeat(var(--grid-size), var(--cell-size));
  gap: var(--cell-gap);
  padding: var(--cell-gap);
  padding-top: calc(var(--cell-gap) + 48px);
  position: relative;
}
.cell {
  font-size: 7.5vmin;
  background-color: #a0a0a0;
  border-radius: 1vmin;
}
.tile {
  font-size: 7.5vmin;
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  width: var(--cell-size);
  height: var(--cell-size);
  border-radius: 1vmin;
  top: calc(
    var(--y) * (var(--cell-size) + var(--cell-gap)) + var(--cell-gap) + 48px
  );
  left: calc(var(--x) * (var(--cell-size) + var(--cell-gap)) + var(--cell-gap));
  font-weight: bold;
  background-color: hsl(200, 50%, var(--background-lightness));
  color: hsl(200, 25%, var(--color-lightness));
  animation: show 200ms ease-in;
  transition: 100ms ease-in;
}

.rating-btn {
  font-size: 1em;
}
.modal-rating-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70vmin;
  height: 70vmin;
  position: absolute;
  backdrop-filter: blur(16px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 1vmin;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -31vmin);
  z-index: 10;
  padding: 36px;
  overflow-y: scroll;
}
.modal-rating-block {
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.modal-rating-block::-webkit-scrollbar {
  display: none;
}
.close-btn {
  width: 4vmin;
  position: absolute;
  top: 2vmin;
  right: 2vmin;
  cursor: pointer;
}
.stats-table {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.8em;
}
.filter-buttons {
  max-width: 60vmin;
  width: 100%;
  padding: 2vmin;
  display: flex;
  justify-content: space-around;
}
.filter-buttons > p {
  cursor: pointer;
  transition: color 300ms;
}
.filter-buttons > p::before {
  display: inline-block;
  content: var(--icon);
  width: 12px;
  vertical-align: middle;
  margin-right: 4px;
}
.filter-buttons > p:hover {
  color: var(--third);
}
.hidden {
  visibility: hidden;
}
.game-stats {
  padding: 4px;
  border-radius: 4px;
  display: flex;
  justify-content: space-between;
  background-color: rgba(100, 100, 100, 0.5);
}
.game-stats > p {
  text-align: center;
  width: 100px;
}
.control-buttons {
  display: none;
}
.control-btn {
  width: var(--cell-size);
  height: var(--cell-size);
  border-radius: 1vmin;
  background-color: #a0a0a0;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: all 200ms;
}
.control-btn > img {
  width: 7vmin;
}
.down-btn {
  transform: rotate(180deg);
}
.left-btn {
  transform: rotate(270deg);
}
.right-btn {
  transform: rotate(90deg);
}
.control-btn:hover {
  background-color: #888888;
}
.control-btn:active {
  background-color: #777777;
}

.modal-finish-block {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  position: absolute;
  backdrop-filter: blur(16px);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
  background-color: rgba(255, 255, 255, 0.1);
  width: 60vmin;
  height: 60vmin;
  padding: 6vmin;
  border-radius: 1vmin;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
}
.play-again {
  padding: 12px 24px;
  border: none;
  outline: none;
  border-radius: 1vmin;
  cursor: pointer;
  transition: color 200ms;
  background-color: rgba(222, 222, 222, 0.9);
}
.play-again:hover {
  background-color: rgba(240, 240, 240, 1);
}
.play-again:focus {
  border: none;
  outline: none;
}
.result-of-game {
  font-size: 2em;
}

@media screen and (max-width: 767px) {
  :root {
    --cell-size: 18vmin;
  }
  body {
    min-height: 88vh;
    overscroll-behavior: contain;
  }
  h1 {
    font-size: 1.4em;
    width: 100%;
  }
  header {
    flex-wrap: wrap;
  }
  footer a,
  footer p,
  footer a img {
    font-size: 1em;
  }
  .game-board {
    padding-bottom: calc((var(--cell-gap) * 2) + var(--cell-size));
  }
  .control-buttons {
    display: flex;
    gap: var(--cell-gap);
    position: absolute;
    left: var(--cell-gap);
    bottom: var(--cell-gap);
  }
  .game-stats {
    font-size: 0.9em;
  }
  .game-stats > p {
    width: 90px;
  }
  .modal-rating-block {
    width: 90vmin;
    height: 90vmin;
    padding: 6vmin;
    overflow-x: hidden;
  }
  .filter-buttons {
    max-width: 80vmin;
  }
}

@media screen and (min-width: 768px) and (max-width: 1024px) {
  .game-board {
    padding-right: calc((var(--cell-gap) * 2) + var(--cell-size));
  }
  .control-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--cell-gap);
    position: absolute;
    right: var(--cell-gap);
    bottom: var(--cell-gap);
  }
  .modal-rating-block {
    width: 80vmin;
  }
}