* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: #050510;
  overflow: hidden;
  font-family: 'Segoe UI', system-ui, sans-serif;
  color: #fff;
}
#scene { display: block; width: 100vw; height: 100vh; }

.ui {
  position: fixed;
  inset: 0;
  pointer-events: none;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
h1 {
  font-size: 1.4rem;
  letter-spacing: 0.3em;
  font-weight: 300;
  opacity: 0.85;
}
h1 span { color: #00e5ff; font-weight: 600; }

.modes {
  display: flex;
  gap: 0.8rem;
  pointer-events: auto;
  align-self: flex-end;
}
.modes button {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(0,229,255,0.35);
  color: #9fe9ff;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.25s ease;
  backdrop-filter: blur(6px);
}
.modes button:hover { background: rgba(0,229,255,0.15); }
.modes button.active {
  background: #00e5ff;
  color: #001018;
  box-shadow: 0 0 20px rgba(0,229,255,0.6);
}