@import url("https://fonts.googleapis.com/css2?family=Audiowide&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Audiowide", serif;
  line-height: 1;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: hsl(0, 0%, 5%);
  color: hsl(0, 0%, 95%);
  user-select: none;
}

.canvasWrapper {
  max-width: 95%;
  max-height: 95%;
  aspect-ratio: 16 / 9;
  border: 2px solid hsl(0, 0%, 10%);
  background-color: black;
  position: relative;
  display: flex;
  background-image: url(assets/stars.png);
  background-position: center center;
  background-size: 50vmin;
}

canvas {
  width: 100%;
  height: 100%;
}

#score {
  position: absolute;
  top: 0;
  right: 0;
  color: white;
  padding: 1.5vmin;
  font-size: 3vmin;
  line-height: 1;
}

#splash,
#gameOver,
#paused {
  position: fixed;
  width: 100%;
  height: 100%;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url(assets/stars.png);
  background-position: center center;
  background-size: 50vmin;
  z-index: 1;
  transition: opacity 0.5s;
}

#splash.hidden,
#gameOver.hidden,
#paused.hidden {
  opacity: 0;
  pointer-events: none;
}

.innerWrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3vmin;
}

#splash h1,
#gameOver h2,
#paused h2 {
  font-size: 10vmin;
}

#paused h2 {
  animation: twinkle 2s linear infinite;
}

@keyframes twinkle {
  from {
    opacity: 1;
  }
  45% {
    opacity: 0.3333;
  }
  90% {
    opacity: 1;
  }
  to {
    opacity: 1;
  }
}

#gameOver h3 {
  font-size: 3vmin;
}

#paused p {
  font-size: 3vmin;
}

button {
  padding: 1.5vmin;
  background-color: transparent;
  color: inherit;
  font-size: 1.5vmin;
  outline: 0;
  border: 2px solid hsl(0, 0%, 25%);
  cursor: pointer;
  position: relative;
  margin-top: 1em;
}

button span {
  opacity: 0.5;
  transition: opacity 0.5s;
  text-transform: uppercase;
}

button .line {
  position: absolute;
  background-color: white;
  transition: transform 1s;
}

button .top,
button .bottom {
  width: calc(100% + 4px);
  height: 2px;
  transform: scaleX(0);
}

button .left,
button .right {
  width: 2px;
  height: calc(100% + 4px);
  transform: scaleY(0);
}

button .top {
  top: -2px;
  left: -2px;
  transform-origin: left;
}

button .bottom {
  bottom: -2px;
  right: -2px;
  transform-origin: right;
}

button .left {
  left: -2px;
  bottom: -2px;
  transform-origin: bottom;
}

button .right {
  right: -2px;
  top: -2px;
  transform-origin: top;
}

button:is(:hover, :focus, :active) .top,
button:is(:hover, :focus, :active) .bottom {
  transform: scaleX(1);
}

button:is(:hover, :focus, :active) .left,
button:is(:hover, :focus, :active) .right {
  transform: scaleY(1);
}

button:is(:hover, :focus, :active) span {
  opacity: 1;
}

button:is(:hover, :focus, :active) span,
button:is(:hover, :focus, :active) .line {
  transition-delay: 0.25s;
}

.controls {
  margin-top: 5vmin;
  border: 1px solid hsl(0, 0%, 50%);
  background-color: hsl(0, 0%, 7.5%);
  padding: 2vmin 4vmin 3vmin;
}

.controls h3 {
  margin-bottom: 3vmin;
  text-align: center;
  font-size: 3vmin;
}

dl {
  display: grid;
  grid-template-columns: 1fr auto;
  font-size: 2vmin;
  gap: 3vmin 1.5vmin;
}

dt,
dd {
  display: flex;
  align-items: center;
  gap: 1.5vmin;
}

dt {
  justify-content: flex-start;
}

dd {
  justify-content: center;
}

.wasd {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 0.5vmin;
  grid-template-areas:
    ". w ."
    "a s d";
}

.wasd kbd:nth-child(1) {
  grid-area: w;
}

.wasd kbd:nth-child(2) {
  grid-area: a;
}

.wasd kbd:nth-child(3) {
  grid-area: s;
}

.wasd kbd:nth-child(4) {
  grid-area: d;
}

kbd {
  display: inline-block;
  vertical-align: middle;
  white-space: nowrap;
  line-height: 1;
  padding: 0.2em 0.4em;
  font-size: 0.9em;
  color: hsl(0, 0%, 20%);
  background-color: hsl(0, 0%, 90%);
  border: 1px solid hsl(0, 0%, 80%);
  border-radius: 0.25em;
  box-shadow: 0 0.05em 0 hsla(0, 0%, 0%, 20%),
    0 0.1em 0 hsla(0, 0%, 100%, 50%) inset;
}

#splash footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 2vmin;
  color: hsl(0, 0%, 60%);
}

a {
  color: inherit;
  outline: 0;
  transition: color 0.5s;
}

a:hover,
a:active,
a:focus {
  color: hsl(0, 0%, 100%);
}