:root {
  --bg: #0b1321;
  --panel: #101b33;
  --panel-2: #122345;
  --line: rgba(148, 163, 184, 0.24);
  --text: #e2e8f0;
  --muted: #94a3b8;
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Tahoma", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 10%, #233762 0%, transparent 30%),
    radial-gradient(circle at 85% 20%, #1f4f4c 0%, transparent 30%),
    linear-gradient(180deg, #0f1a30, #0b1321 70%);
  color: var(--text);
}

.shell {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 12px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.topbar h1 {
  margin: 0;
  font-size: 1.4rem;
}

.topbar p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

#restartBtn {
  border: 0;
  border-radius: 10px;
  padding: 9px 14px;
  background: linear-gradient(135deg, #f97316, #ea580c);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.hud {
  margin: 12px 0;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}

.chip {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  display: flex;
  justify-content: space-between;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
}

.chip span { color: var(--muted); }

#game {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0b172d;
  display: block;
  touch-action: none;
}

.tip {
  margin: 8px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.mobile-controls {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
}

.pad {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: rgba(10, 19, 36, 0.6);
}

.pad button,
.fire {
  border: 0;
  border-radius: 10px;
  background: #1d4ed8;
  color: #fff;
  padding: 10px 12px;
  font-weight: 700;
  cursor: pointer;
}

.pad > button {
  display: block;
  width: 100%;
  margin-bottom: 8px;
}

.row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.fire {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  min-width: 100px;
}

@media (min-width: 900px) {
  .mobile-controls {
    display: none;
  }
}

@media (max-width: 760px) {
  .hud {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}