/* mosaic-reset: uiverse 컴포넌트 공통 전제 (box-sizing + 기본 sans-serif) */
*, *::before, *::after { box-sizing: border-box; }
:where(body) { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }

/* 단독 동작용 무대 — 검은 막대가 보이도록 밝은 배경 + 중앙 정렬 */
html, body { margin: 0; height: 100%; }
body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #e8e8e8;
}

/* ---- 컴포넌트 본체 (uiverse: good-wolverine-51) ---- */
.burger {
  position: relative;
  width: 40px;
  height: 30px;
  background: transparent;
  cursor: pointer;
  display: block;
}

.burger input {
  display: none;
}

.burger span {
  display: block;
  position: absolute;
  height: 4px;
  width: 100%;
  background: black;
  border-radius: 9px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: .25s ease-in-out;
}

.burger span:nth-of-type(1) {
  top: 0px;
  transform-origin: left center;
}

.burger span:nth-of-type(2) {
  top: 50%;
  transform: translateY(-50%);
  transform-origin: left center;
}

.burger span:nth-of-type(3) {
  top: 100%;
  transform-origin: left center;
  transform: translateY(-100%);
}

.burger input:checked ~ span:nth-of-type(1) {
  transform: rotate(45deg);
  top: 0px;
  left: 5px;
}

.burger input:checked ~ span:nth-of-type(2) {
  width: 0%;
  opacity: 0;
}

.burger input:checked ~ span:nth-of-type(3) {
  transform: rotate(-45deg);
  top: 28px;
  left: 5px;
}