.help-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 8px 12px;
  font-size: 12px;
  font-family: "Press Start 2P", monospace;
  border: 2px solid var(--panel-edge);
  background: var(--panel);
  color: var(--panel-edge);
  cursor: pointer;
  letter-spacing: 0.2em;
  transition: all 0.2s ease;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.3);
}

.help-btn:hover {
  background: var(--panel-edge);
  color: var(--ink);
  transform: translateY(-1px);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.3), 0 0 10px rgba(100, 255, 218, 0.3);
}

.help-btn:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.3);
}

.help-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  display: block;
  margin: 0 auto;
}

.config-btn {
  position: absolute;
  top: 10px;
  right: 60px;
  padding: 8px 12px;
  font-size: 12px;
  font-family: "Press Start 2P", monospace;
  border: 2px solid var(--panel-edge);
  background: var(--panel);
  color: var(--panel-edge);
  cursor: pointer;
  letter-spacing: 0.2em;
  transition: all 0.2s ease;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.3);
}

.config-btn:hover {
  background: var(--panel-edge);
  color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 5px 0 rgba(0, 0, 0, 0.3), 0 0 15px rgba(100, 255, 218, 0.4);
}

.config-btn:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.3);
}

.config-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  display: block;
  margin: 0 auto;
}

/* Pause button (top-left) */

/* ...existing code... */

.game-over-panel {
  display: none;
  position: absolute;
  inset: 0;
  background: rgba(5, 6, 15, 0.94);
  border: 3px solid var(--accent);
  color: var(--text);
  padding: 40px 20px;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 18px;
  text-align: center;
}

.game-over-panel.show {
  display: flex;
}

.game-over-text {
  font-size: 26px;
}

.game-over-score {
  font-size: 14px;
  color: var(--muted);
}

.game-over-batteries {
  font-size: 14px;
  color: #ffd700;
  margin-top: -8px;
}

.game-over-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-top: 20px;
}

.restart-btn {
  padding: 12px 22px;
  font-size: 12px;
  font-family: "Press Start 2P", monospace;
  border: 2px solid var(--text);
  background: var(--panel);
  color: var(--panel-edge);
  cursor: pointer;
  letter-spacing: 0.18em;
  transition: all 0.2s ease;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.3);
}

.restart-btn:hover {
  background: var(--panel-edge);
  color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 5px 0 rgba(0, 0, 0, 0.3), 0 0 15px rgba(100, 255, 218, 0.4);
}

.restart-btn:active {
  transform: translateY(1px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.3);
}

.menu-btn {
  padding: 12px 22px;
  font-size: 12px;
  font-family: "Press Start 2P", monospace;
  border: 2px solid var(--text);
  background: var(--accent);
  color: var(--text);
  cursor: pointer;
  letter-spacing: 0.18em;
  transition: transform 0.1s ease;
}

.menu-btn:active {
  transform: translateY(2px);
}

/* Mute Button (Start Screen) */
.mute-btn {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 8px;
  background: transparent;
  border: none;
  color: var(--panel-edge);
  cursor: pointer;
  transition: transform 0.2s ease;
  z-index: 20;
}

.mute-btn:hover {
  transform: scale(1.1);
  color: var(--text);
}

.hidden {
  display: none !important;
}