:root {
  --bg-a: #0e1022;
  --bg-b: #202f52;
  --edge: #2c3f64;
  --shell-shadow: rgba(3, 6, 14, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 8% 12%, rgba(173, 225, 255, 0.18), transparent 35%),
    radial-gradient(circle at 80% 0%, rgba(99, 205, 255, 0.15), transparent 32%),
    linear-gradient(160deg, var(--bg-a), var(--bg-b));
}

.shell {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: 0;
}

#game-canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  max-height: none;
  border: none;
  border-radius: 0;
  box-shadow: none;
  image-rendering: auto;
  cursor: pointer;
}

@media (max-width: 900px) {
  #game-canvas {
    width: 100vw;
    height: 100vh;
    border-radius: 0;
  }
}