.desktop-hint {
  margin: 0;
  padding: 7px 12px;
  border-top: 1px solid #7367bb;
  color: #a5f3fc;
  background: #1d174d;
  text-align: center;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .08em;
}
.arena::after {
  position: absolute;
  inset: 0;
  z-index: 3;
  content: "";
  pointer-events: none;
  background: repeating-linear-gradient(0deg, transparent 0 5px, rgba(103,232,249,.025) 5px 6px);
  mix-blend-mode: screen;
}
@media (hover: hover) and (pointer: fine) {
  .controls input { min-height: 24px; }
  .fire:hover { filter: brightness(1.18) saturate(1.2); transform: translateY(-2px); }
}
@media (hover: none), (pointer: coarse) {
  .desktop-hint { display: none; }
}


/* fit-v8: en PC el campo y todos los controles caben dentro del alto disponible. */
.game-shell {
  height: 100dvh;
  min-height: 0;
  grid-template-rows: 58px minmax(0, 1fr) auto auto auto;
  overflow: hidden;
}
.arena,
.arena canvas {
  min-height: 0;
}
@media (max-width: 680px) {
  .game-shell { grid-template-rows: auto minmax(0, 1fr) auto auto auto; }
}