.sample-size {
  border: 1px solid var(--gray-200, #aaa);
  border-radius: .5rem;
  padding: 1.25rem;
  margin: 1.5rem 0;
}
.sample-size-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.sample-size label {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  font-weight: 600;
}
@media (max-width: 600px) {
  .sample-size-fields { grid-template-columns: 1fr; }
}
.sample-size input, .sample-size select {
  display: block;
  box-sizing: border-box;
  width: 100%;
  height: 3rem;
  margin-top: .5rem;
  padding: .6rem;
  font: inherit;
  color: inherit;
  background: var(--body-background, white);
  border: 1px solid var(--gray-200, #aaa);
  border-radius: .25rem;
}
.sample-size input:focus-visible, .sample-size select:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}
.sample-size-result { border-top: 1px solid var(--gray-200, #aaa); padding-top: 1rem; }
.sample-size-result strong { display: block; font-size: 1.5rem; }
.sample-size-result span { display: block; margin-top: .5rem; }