:root {
  color-scheme: dark;
  --hud-bg: rgba(6, 10, 18, 0.72);
  --hud-border: rgba(255, 255, 255, 0.12);
  --hud-text: #e9f1ff;
  --hud-muted: rgba(233, 241, 255, 0.7);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at top, #10192c 0%, #05070d 55%, #020306 100%);
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  overflow: hidden;
}

#scene {
  width: 100%;
  height: 100%;
  display: block;
}

#hud {
  position: fixed;
  left: 24px;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  color: var(--hud-text);
  backdrop-filter: blur(10px);
  z-index: 10;
  max-width: 320px;
}

#hud .title {
  font-size: 18px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

#status {
  font-size: 13px;
  color: var(--hud-muted);
  line-height: 1.5;
  white-space: pre-line;
}

#hud .controls {
  display: grid;
  gap: 4px;
  font-size: 12px;
  color: var(--hud-muted);
}

@media (max-width: 600px) {
  #hud {
    left: 12px;
    right: 12px;
    max-width: unset;
  }

  #hud .title {
    font-size: 16px;
  }
}