:root {
  --panel-bg: rgba(12, 18, 26, 0.72);
  --ink: #e8eef4;
  --ink-dim: #93a4b3;
  --accent: #6fd0a7;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0c121a;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

#title {
  position: fixed;
  top: max(18px, env(safe-area-inset-top));
  left: 0;
  right: 0;
  text-align: center;
  pointer-events: none;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.8);
}

#title h1 {
  margin: 0;
  font-size: clamp(22px, 5vw, 34px);
  font-weight: 300;
  letter-spacing: 0.14em;
  color: var(--ink);
}

#title p {
  margin: 2px 0 0;
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

#panel {
  position: fixed;
  top: max(12px, env(safe-area-inset-top));
  left: max(12px, env(safe-area-inset-left));
  width: 220px;
  padding: 12px 14px;
  background: var(--panel-bg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  user-select: none;
}

#panel h1 {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 7px 0;
}

.row label {
  flex: 0 0 44px;
  color: var(--ink-dim);
  font-size: 12px;
}

.row select,
.row input[type="number"] {
  flex: 1;
  min-width: 0;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  color: var(--ink);
  padding: 4px 6px;
  font: inherit;
}

.row input[type="range"] {
  flex: 1;
  min-width: 0;
  accent-color: var(--accent);
}

.row output {
  flex: 0 0 22px;
  text-align: right;
  font-size: 12px;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}

.row button {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  color: var(--ink);
  padding: 4px 10px;
  font-size: 15px;
  cursor: pointer;
}
.row button:active { background: rgba(111, 208, 167, 0.25); }

#export { flex: 1; font-size: 12px; }

.toggles { gap: 14px; }
.toggles label {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--ink);
  font-size: 13px;
  cursor: pointer;
}
.toggles input { accent-color: var(--accent); }

#src {
  position: fixed;
  bottom: max(10px, env(safe-area-inset-bottom));
  right: 16px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  text-decoration: none;
  opacity: 0.65;
}
#src:hover { color: var(--accent); opacity: 1; }

.hint {
  margin: 10px 0 0;
  font-size: 11px;
  color: var(--ink-dim);
}

@media (max-width: 480px) {
  #panel { width: 190px; padding: 10px 12px; }
}