.controls {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 50;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}
.controls > details {
  border: 1px solid var(--color-rule);
  background: var(--color-bg);
  border-radius: 0.4rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.controls > details > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.4rem 0.7rem;
  user-select: none;
  text-align: center;
}
.controls > details > summary::-webkit-details-marker { display: none; }
.controls > details[open] > summary { border-bottom: 1px solid var(--color-rule); }
.controls-body {
  padding: 0.75rem 0.9rem;
  display: grid;
  gap: 0.9rem;
  min-width: 14rem;
}
.controls fieldset { display: grid; gap: 0.3rem; }
.controls legend {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: 0.25rem;
}
.controls label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
}
.controls .layers button {
  background: transparent;
  border: 1px solid var(--color-rule);
  border-radius: 0.25rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.78rem;
  margin-top: 0.4rem;
  margin-right: 0.3rem;
  color: var(--color-ink-soft);
}
.controls .layers button:hover { color: var(--color-ink); border-color: var(--color-ink-soft); }