html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: #1f2933;
  color: #111827;
  font-family: "Yu Gothic", "Meiryo", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  touch-action: none;
}

.app-shell {
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 20% 15%, rgba(247, 199, 68, 0.2), transparent 24rem),
    linear-gradient(150deg, #243447 0%, #111827 48%, #2a2119 100%);
}

.canvas-frame {
  width: min(100vw, calc(100vh * 640 / 1136));
  width: min(100vw, calc(100dvh * 640 / 1136));
  height: min(100vh, calc(100vw * 1136 / 640));
  height: min(100dvh, calc(100vw * 1136 / 640));
  max-width: 640px;
  max-height: 1136px;
  background: #f8fafc;
  box-shadow: 0 20px 70px rgba(0, 0, 0, 0.45);
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: auto;
  touch-action: none;
}