:root {
  --bg: #0f1720;
  --panel: #0b1220;
  --muted: #9aa4b2;
  --accent: #6ee7b7;
}
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  padding: 24px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial;
  color: #e6eef6;
  background: linear-gradient(180deg, var(--bg), #071022);
  display: flex;
  align-items: center;
  justify-content: center;
}
.wrap {
  width: 760px;
  max-width: 95%;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02),
    rgba(0, 0, 0, 0.1)
  );
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}
header {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
h1 {
  margin: 0;
  font-size: 20px;
}
.tag {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}
.game-area {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-top: 14px;
}
canvas {
  background: linear-gradient(180deg, #06111a, #07202a);
  border-radius: 8px;
  border: 4px solid rgba(255, 255, 255, 0.03);
  display: block;
}
.hud {
  margin-left: 12px;
  color: var(--muted);
  font-weight: 600;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.hud span {
  color: var(--accent);
}
.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 14px;
}
button {
  background: #0b1220;
  color: #dfeaf6;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.03);
  cursor: pointer;
}
button:hover {
  filter: brightness(1.05);
}
.toggle {
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.speed {
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}
.help {
  color: var(--muted);
  margin-left: 8px;
  font-size: 13px;
}
footer {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 600px) {
  .wrap {
    padding: 12px;
  }
  .hud {
    flex-direction: row;
  }
}