html,
body {
  margin: 0;
  padding: 0;
  background: #000;
  height: 100%;
  overflow: hidden;
  touch-action: none;
}

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  background: #000;
}

.hamburger-menu-btn,
.close-menu-btn {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 10;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  cursor: pointer;
  font-size: 28px;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}

.hamburger-menu-btn:hover,
.close-menu-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Version in bottom-right with hover tooltip */
.game-version-wrap {
  position: fixed;
  bottom: 10px;
  right: 10px;
  z-index: 20;
  font: 14px monospace;
  color: rgba(255, 255, 255, 0.8);
  pointer-events: auto;
  cursor: default;
}

.game-version-tooltip {
  display: none;
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: 4px;
  white-space: nowrap;
  background: rgba(0, 0, 0, 0.85);
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-family: inherit;
}

.game-version-wrap .game-version-tooltip.game-version-tooltip-visible {
  display: block;
}

.game-version-tooltip a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
}

.game-version-tooltip a:hover {
  text-decoration: underline;
}

.hamburger-menu-btn {
  background-image:
    linear-gradient(to right, currentColor, currentColor),
    linear-gradient(to right, currentColor, currentColor),
    linear-gradient(to right, currentColor, currentColor);
  background-size: 24px 3px;
  background-repeat: no-repeat;
  background-position: center 14px, center 21px, center 28px;
  font-size: 0;
}