/* Number Rover overlay — ES5-safe layout (no grid/gap/custom properties). */
.onto-rover-overlay {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 9000;
  display: none;
  background: #0a1628;
  color: #f4f1ea;
  font-family: system-ui, sans-serif;
}

.onto-rover-overlay.onto-rover-open {
  display: block;
}

.onto-rover-hud {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 56px;
  padding: 8px 20px;
  box-sizing: border-box;
  background: #142038;
  border-bottom: 3px solid #4aa3ff;
  overflow: hidden;
}

.onto-rover-hearts {
  position: absolute;
  left: 20px;
  top: 12px;
  font-size: 28px;
  letter-spacing: 4px;
  color: #ff4b4b;
}

.onto-rover-sum,
.onto-rover-target {
  position: absolute;
  top: 10px;
  width: 120px;
  text-align: right;
}

.onto-rover-sum {
  left: 50%;
  margin-left: -140px;
}

.onto-rover-target {
  left: 50%;
  margin-left: 20px;
}

.onto-rover-sum-label,
.onto-rover-target-label {
  display: inline-block;
  width: 36px;
  font-size: 14px;
  text-transform: uppercase;
  color: #8eb8ff;
  text-align: left;
  margin-right: 8px;
}

.onto-rover-sum-val,
.onto-rover-target-val {
  display: inline-block;
  min-width: 48px;
  font-size: 32px;
  font-weight: 800;
  font-family: monospace;
  color: #ffe566;
}

.onto-rover-target-val {
  color: #3ee07a;
}

.onto-rover-score {
  position: absolute;
  right: 100px;
  top: 16px;
  font-size: 18px;
  font-family: monospace;
  color: #ffcc33;
}

.onto-rover-level {
  position: absolute;
  right: 20px;
  top: 14px;
  font-size: 22px;
  font-weight: 700;
  color: #5af0ff;
}

.onto-rover-board {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 810px;
  height: 630px;
  margin-left: -405px;
  margin-top: -280px;
  border: 6px solid #6b4fd4;
  border-radius: 12px;
  box-shadow: 0 12px 0 #2a1850, 0 0 48px rgba(74, 163, 255, 0.35);
  background: #1a3d5c;
}

.onto-rover-hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 16px;
  text-align: center;
  font-size: 18px;
  color: #8eb8ff;
  letter-spacing: 0.5px;
}

.onto-rover-overlay[data-phase="won"] .onto-rover-hint::after,
.onto-rover-overlay[data-phase="lost"] .onto-rover-hint::after {
  display: block;
  margin-top: 6px;
  font-size: 26px;
  font-weight: 800;
  color: #ffe566;
}

.onto-rover-overlay[data-phase="won"] .onto-rover-hint::after {
  content: "All levels clear \2014 OK to exit";
}

.onto-rover-overlay[data-phase="lost"] .onto-rover-hint::after {
  content: "Out of hearts \2014 OK to try again";
}

@media (prefers-color-scheme: light) {
  .onto-rover-overlay {
    background: #e8f2ff;
    color: #1a2030;
  }

  .onto-rover-hud {
    background: #ffffff;
    border-bottom-color: #4aa3ff;
  }

  .onto-rover-sum-label,
  .onto-rover-target-label {
    color: #3a5080;
  }

  .onto-rover-sum-val {
    color: #c45a00;
  }

  .onto-rover-target-val {
    color: #0a7840;
  }

  .onto-rover-score {
    color: #9a7200;
  }

  .onto-rover-level {
    color: #007aa8;
  }

  .onto-rover-hint {
    color: #3a5080;
  }

  .onto-rover-board {
    border-color: #4aa3ff;
    box-shadow: 0 12px 0 #b8cce8, 0 0 32px rgba(74, 163, 255, 0.45);
  }
}
/* One compact HUD row, and a board sized by the viewport without distortion. */
.onto-rover-hud { display:flex; align-items:center; justify-content:space-between; height:64px; overflow:visible; }
.onto-rover-hud > div { position:static; margin:0 4px; width:auto; font-size:20px; }
.onto-rover-sum-label,.onto-rover-target-label { width:auto; font-size:18px; }
.onto-rover-sum-val,.onto-rover-target-val { font-size:32px; min-width:28px; }
.onto-rover-board { box-sizing:border-box; }
.onto-rover-hint { left:16px;right:16px;line-height:1.4; }
@media(max-width:600px) {
 .onto-rover-hud { padding:8px 4px; }
 .onto-rover-hud > div { font-size:14px; margin:0 2px;letter-spacing:0; }
 .onto-rover-sum-label,.onto-rover-target-label {font-size:13px;margin-right:4px;}
 .onto-rover-sum-val,.onto-rover-target-val {font-size:22px;min-width:16px;}
 .onto-rover-hint { font-size:15px; }
}
.onto-rover-hud {flex-wrap:wrap;height:auto;min-height:64px;}
.onto-rover-hud > div {white-space:nowrap;}