header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 40px;
  background-color: #1e1e1e;
  box-shadow: 0 2px 10px rgba(0,0,0,0.5);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  width: 100px;
  height: 100px;
}

nav {
  display: flex;
  gap: 20px;
  transition: max-height 0.4s ease, opacity 0.4s ease;
}

/* 상단 버튼 스타일 */
.top-button {
  background: #3663FF;
  color: #fff;
  padding: 12px 24px;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  font-size: 16px;
  transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  white-space: nowrap;
}

.top-button:hover {
  transform: translateY(-8px) scale(1.05);
}

.top-button:active {
  background: #2952CC;
}

/* 햄버거 버튼 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 22px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 4px;
  background: #ffffff;
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* 메뉴 열릴 때 햄버거 → X로 변환 */
.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(9px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-9px);
}

/* 모바일 모드 */
@media (max-width: 800px) {
  .menu-toggle {
    display: flex;
  }

  nav {
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background-color: #1e1e1e;
    align-items: center;
    gap: 15px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
  }

  nav.active {
    max-height: 500px;
    opacity: 1;
  }

  .top-button {
    width: 80%;
  }
}
  padding: 12px 24px;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  font-size: 16px;
  transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  white-space: nowrap;
}

.top-button:hover {
  transform: translateY(-8px) scale(1.05);
}

.top-button:active {
  background: #2952CC;
}

/* 햄버거 버튼 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 22px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 4px;
  background: #ffffff;
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* 메뉴 열릴 때 햄버거 → X로 변환 */
.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(9px);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-9px);
}

/* 모바일 모드 */
@media (max-width: 800px) {
  .menu-toggle {
    display: flex;
  }

  nav {
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background-color: #1e1e1e;
    align-items: center;
    gap: 15px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
  }

  nav.active {
    max-height: 500px;
    opacity: 1;
  }

  .top-button {
    width: 80%;
  }
}