:root {
  --fg: #e5e7eb;
  --panel: rgba(11, 18, 37, 0.84);
  --border: rgba(148, 163, 184, 0.4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  overflow: hidden;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: radial-gradient(circle at 35% 30%, #172554, #020617 55%);
  color: var(--fg);
}

#scene {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

.controls,
.info {
  position: fixed;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem;
  backdrop-filter: blur(6px);
  width: min(300px, calc(100vw - 1rem));
}

.controls { top: 0.5rem; left: 0.5rem; }
.info { top: 0.5rem; right: 0.5rem; }

h1,h2 { margin: 0 0 0.4rem; }

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

button,
input[type="range"] {
  width: 100%;
}

button {
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #1d4ed8;
  color: white;
  padding: 0.5rem;
  cursor: pointer;
  font-weight: 600;
}

.status {
  margin-top: 0.6rem;
  padding: 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(30, 64, 175, 0.22);
}

@media (max-width: 760px) {
  .controls,
  .info {
    width: calc(100vw - 1rem);
    position: fixed;
    left: 0.5rem;
    right: 0.5rem;
  }

  .controls { top: 0.5rem; }
  .info { top: auto; bottom: 0.5rem; }
}