html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: radial-gradient(circle at 30% 20%, rgba(90, 140, 255, 0.12), transparent 24%), linear-gradient(180deg, #07111f 0%, #09182b 100%);
  color: #ecf3ff;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
#webgl {
  width: 100%;
  height: 100%;
  display: block;
}
.overlay {
  position: absolute;
  z-index: 2;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(8, 16, 30, 0.66);
  border: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.22);
  font-size: 12px;
  line-height: 1.5;
}
.overlay strong {
  display: block;
  margin-bottom: 4px;
  color: #70d6ff;
}
.top-left { left: 16px; top: 16px; max-width: 280px; }
.top-right { right: 16px; top: 16px; max-width: 260px; }
.bottom-left { left: 16px; bottom: 16px; max-width: 320px; color: #93a4c3; }