*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
  background: #05070d;
  color: #d7e6f2;
  font-family: "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

body {
  display: grid;
  place-items: center;
}

#frame {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

#game {
  display: block;
  width: min(92vw, calc(92vh * 420 / 740));
  height: min(86vh, calc(92vw * 740 / 420));
  background: #070b14;
  border: 1px solid #1c2a3d;
  border-radius: 4px;
  cursor: none;
  image-rendering: auto;
}

.hint {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #6b8094;
}

@media (max-width: 640px) {
  .hint {
    display: none;
  }

  #game {
    width: 100vw;
    height: 100vh;
    border: 0;
    border-radius: 0;
  }
}