* {
  margin: 0;
  padding: 0;
}

body,
html {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-color: #f7f7f7;
}

#game_inner {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 500px;
  aspect-ratio: 1 / 1;
}

#canvas {
  background-color: #333;
  position: absolute;
  z-index: 0;
  border-radius: 4px;
}

#start_screen {
  position: relative;
  white-space: nowrap;
  z-index: 1;
  width: 80%;
  height: 80%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
  border: 1px solid white;
  border-radius: 4px;
}

#start_title {
  font-size: 32px;
  letter-spacing: 1px;
  color: white;
  font-weight: bold;
}

#start_btn {
  color: white;
  border: 1px solid white;
  background: none;
  cursor: pointer;
  font-size: 16px;
  border-radius: 4px;
  padding: 10px 20px;
}

#game_over_screen {
  width: 80%;
  height: 80%;
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
  border: 1px solid white;
  background-color: #00000080;
  border-radius: 4px;
}

#game_over_title {
  font-size: 32px;
  letter-spacing: 1px;
  color: white;
  font-weight: bold;
}

#score {
  font-size: 24px;
  color: white;
}

#again_btn {
  color: white;
  border: 1px solid white;
  background: none;
  cursor: pointer;
  font-size: 16px;
  border-radius: 4px;
  padding: 10px 20px;
}

.hidden {
  display: none !important;
}

@media screen and (max-width: 516px) {
  #game_inner {
    width: 100vw;
    aspect-ratio: 1 / 1;
  }

  #start_title {
    font-size: 24px;
  }
}