:root {
  color-scheme: dark;
  background: #050715;
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  touch-action: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 28%, rgba(31, 75, 145, 0.45), transparent 38%),
    #050715;
}

body {
  display: grid;
  place-items: center;
  overscroll-behavior: none;
}

.game-shell {
  width: min(100vw, calc(100vh * 0.5625));
  height: min(100vh, calc(100vw * 1.7777778));
  max-width: 720px;
  max-height: 1280px;
  position: relative;
  overflow: hidden;
  background: #080b24;
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.8);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}