:root {
  color-scheme: dark;
  --bg: #070910;
  --fg: #e8eefc;
  --accent: #7ee7ff;
  --warn: #ff8f8f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 20% 20%, #16213a 0%, #070910 65%);
  color: var(--fg);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.game-shell {
  width: min(100vw, 980px);
  padding: 0.75rem;
  position: relative;
}

.hud {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  gap: 0.5rem;
}

.hud-item {
  background: rgba(5, 9, 20, 0.7);
  border: 1px solid rgba(126, 231, 255, 0.35);
  border-radius: 0.6rem;
  padding: 0.4rem 0.7rem;
  min-width: 7rem;
}

.hud-item span {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.8;
}

.hud-item strong {
  font-size: 1.2rem;
}

canvas {
  width: 100%;
  border: 2px solid rgba(126, 231, 255, 0.4);
  border-radius: 0.6rem;
  background: linear-gradient(#02040a, #070910);
}

.controls {
  text-align: center;
  opacity: 0.9;
  font-size: 0.95rem;
}

kbd {
  background: #182546;
  border: 1px solid rgba(126, 231, 255, 0.35);
  border-bottom-width: 2px;
  border-radius: 0.35rem;
  font-size: 0.85rem;
  padding: 0.1rem 0.35rem;
}

.overlay {
  position: absolute;
  inset: 3.2rem 1.5rem 2.9rem;
  background: rgba(3, 6, 14, 0.78);
  border: 1px solid rgba(126, 231, 255, 0.35);
  border-radius: 0.6rem;
  display: grid;
  place-items: center;
  text-align: center;
  gap: 0.4rem;
  padding: 1rem;
}

.overlay button {
  background: var(--accent);
  color: #072235;
  border: 0;
  border-radius: 0.4rem;
  padding: 0.6rem 1rem;
  font-weight: 700;
  cursor: pointer;
}

.overlay button:hover {
  filter: brightness(1.06);
}

.hidden {
  display: none;
}

.danger {
  color: var(--warn);
}