@import url('https://fonts.googleapis.com/css2?family=Lato:wght@100;300;400;700;900&family=Space+Mono&display=swap');

* {
  --black: #212529;
  --medium-gray: #adb5bd;
  --light-gray: #dee2e6;
  --lighter-gray: #e9ecef;
  --white: #f8f9fa;

  --cell-size: 20px;

  box-sizing: border-box;
}

body {
  color: var(--black);
  background-color: var(--medium-gray);
  font-family: Lato, sans-serif;
  justify-content: center;
  margin: 0;
  padding: 60px 0;
  display: flex;
  min-height: 100vh;
}

main {
  background-color: var(--white);
  width: max-content;
  height: max-content;
  padding: 20px;
}

h1 {
  margin: 0;
}

.header {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin: 0;
}

.start-button {
  background-color: var(--white);
  border-radius: 4px;
  border: 1px solid var(--black);
  cursor: pointer;
  letter-spacing: 2px;
  min-width: 120px;
  padding: 12px 24px;
  text-transform: uppercase;
  transition: letter-spacing 300ms;
}

.start-button:hover {
  letter-spacing: 3px;
}

.start-button:disabled {
  pointer-events: none;
  border: 1px solid var(--light-gray);
  color: var(--light-gray);
}

.legend {
  color: var(--medium-gray);
  margin: 0;
}

.snake-container {
  display: flex;
  justify-content: center;
  padding: 24px 0;
}

.snake {
  border: 2px solid var(--medium-gray);
  position: relative;
}

.snake > * {
  display: grid;
}

.snake .matrix {
  left: 0;
  position: absolute;
  top: 0;
  z-index: 2;
}

.snake .matrix .cell.filled {
  background-color: var(--black);
}

.snake .matrix .cell.food {
  background-color: var(--medium-gray);
  border-radius: 50%;
}

.snake .background {
  position: relative;
  z-index: 0;
}

.snake .background .box {
  border: 1px solid var(--lighter-gray);
}

.snake .game-over {
  align-items: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: absolute;
  z-index: 8;
}

.snake .game-over::before {
  background-color: var(--white);
  content: "";
  display: block;
  opacity: 70%;
}

.snake .game-over,
.snake .game-over:before {
  height: 100%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}

.snake .game-over .content {
  position: relative;
}

.snake .game-over .content h2 {
  text-transform: uppercase;
}

.snake .game-over .content h2,
.snake .game-over .content p {
  text-align: center;
}