/* No margins */
html, body {
  margin: 0;
  padding: 0;
  /*overflow: hidden;  /* no scrollbar */
  width: 100%;
  height: 100%;
}

/* Canvas occupies all the screen */
#app {
  display: block;    /* avoids weird spaces like "inline" */
  width: 100vw;
  height: 100vh;
}


/* ---------------- PLANET ARROWS UI ---------------- */

.planet-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  padding: 12px 16px;
  font-size: 24px;
  cursor: pointer;
  user-select: none;
  background: rgba(0, 0, 0, 0.5);
  border-radius: 999px;
  color: white;
  z-index: 10;
  transition: background 0.2s ease;
}

.planet-arrow:hover {
  background: rgba(0, 0, 0, 0.7);
}

.planet-arrow.left {
  left: 20px;
}

.planet-arrow.right {
  right: 20px;
}

/* Arrows for the planet textures */
.planet-arrow:hover { background: #333; }