html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
}

body {
  height: 100vh;
  height: 100dvh;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
  font-family: "Courier New", Courier, monospace;
}

#stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
  touch-action: none;
}

#game {
  position: absolute;
  display: block;
  background: #000;
  touch-action: none;
}

#pad {
  position: absolute;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 6px;
  touch-action: none;
}

#pad[hidden] {
  display: none;
}

.pad-btn {
  margin: 0;
  padding: 0;
  border: 2px solid rgba(80, 200, 110, 0.55);
  border-radius: 14px;
  background: rgba(30, 90, 45, 0.28);
  color: rgba(210, 255, 220, 0.9);
  font: bold 18px "Courier New", Courier, monospace;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  cursor: pointer;
  min-width: 40px;
  min-height: 40px;
}

.pad-btn svg {
  width: 46%;
  height: 46%;
  fill: currentColor;
}

.pad-btn.is-down {
  background: rgba(80, 200, 110, 0.5);
  border-color: rgba(150, 255, 170, 0.9);
}

.pad-btn[data-dir="up"] { grid-area: 1 / 2; }
.pad-btn[data-dir="left"] { grid-area: 2 / 1; }
.pad-ok { grid-area: 2 / 2; border-radius: 50%; }
.pad-btn[data-dir="right"] { grid-area: 2 / 3; }
.pad-btn[data-dir="down"] { grid-area: 3 / 2; }

.pad-restart {
  grid-area: 3 / 3;
  border-color: rgba(200, 200, 200, 0.35);
  background: rgba(120, 120, 120, 0.18);
  color: rgba(230, 230, 230, 0.75);
  transform: scale(0.8);
}

.pad-restart svg {
  width: 52%;
  height: 52%;
}