.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background: rgba(0, 0, 0, 0.4);
  z-index: 10;
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.header__contents {
  display: flex;
  position: relative;
  width: 100%;
  max-width: 100%;
  padding: 20px 40px;
  height: 100%;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  transition: color 0.4s ease;
  box-sizing: border-box;
}

.header__contents__logo {
  position: relative;
  width: 138px;
  height: 59px;
  cursor: pointer;
}

.header__contents__logo img {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transition: opacity 0.4s ease;
}

.logo-black,
.lang-black,
.dropdown-black {
  opacity: 0;
}

.header__contents__menu {
  display: inline-flex;
  align-items: center;
  gap: 50px;
  transition: color 0.4s ease;
}

.header__contents__menu__item {
  cursor: pointer;
  color: #fff;
  font-family: Pretendard, sans-serif;
  font-size: 18px;
  font-weight: 600;
  transition: color 0.4s ease;
  white-space: nowrap;
  text-decoration: none;
}

.header__contents__language {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.header__contents__language__trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.header__contents__language__icon img {
  position: absolute;
  width: 18px;
  height: 18px;
  transition: opacity 0.4s ease;
}

.header__contents__language__dropdown img {
  position: absolute;
  width: 10px;
  height: 6px;
  transition: opacity 0.4s ease, transform 0.3s ease;
}

.header__contents__language__icon {
  position: relative;
  width: 18px;
  height: 18px;
}

.header__contents__language__dropdown {
  position: relative;
  width: 10px;
  height: 6px;
}

.header__contents__language__selected {
  color: #fff;
  font-family: Pretendard, sans-serif;
  font-size: 18px;
  font-weight: 500;
  transition: color 0.4s ease;
}

.header__contents__language__menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 15px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  z-index: 1000;
  overflow: hidden;
  min-width: 180px;
}

.header__contents__language__options {
  list-style: none;
  margin: 0;
  padding: 8px 0;
}

.header__contents__language__option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  color: #333;
  font-family: Pretendard, sans-serif;
  font-size: 14px;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.header__contents__language__option:hover {
  background-color: #f8f9fa;
}

.header__contents__language__option.active {
  background-color: #016a92;
  color: #fff;
}

.header__contents__language__option .flag {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.header__contents__language__option .lang-text {
  flex: 1;
}

.header__contents__language__option .lang-code {
  font-size: 12px;
  color: #666;
  font-weight: 400;
}

.header__contents__language__option.active .lang-code {
  color: rgba(255, 255, 255, 0.8);
}

.header__contents__language.open .header__contents__language__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__contents__language.open .header__contents__language__dropdown img {
  transform: rotate(180deg);
}

.header.scrolled {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header.scrolled .header__contents__menu__item {
  color: #000;
}

.header.scrolled .header__contents__menu__item:hover {
  color: #016a92;
}

.header.scrolled .header__contents__language__selected {
  color: #000;
}

.header.scrolled .logo-white,
.header.scrolled .lang-white,
.header.scrolled .dropdown-white {
  opacity: 0;
}

.header.scrolled .logo-black,
.header.scrolled .lang-black,
.header.scrolled .dropdown-black {
  opacity: 1;
}

.header__contents__hamburger,
.header__mobile-menu {
  display: none;
}

ul[class$="__intro__menu"] {
  width: 100% !important;
  padding-left: 0 !important;
  justify-content: center !important;
}

@media (max-width: 1240px) {
  .header__contents__menu,
  .header__contents__language {
    display: none;
  }

  .header__contents__hamburger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    cursor: pointer;
    z-index: 101;
  }
  .header__contents__hamburger__line {
    position: relative;
    width: 100%;
    height: 3px;
    background-color: #fff;
    transition: all 0.3s ease;
  }
  .header__contents__hamburger__line::before,
  .header__contents__hamburger__line::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 3px;
    background-color: #fff;
    left: 0;
    transition: all 0.3s ease;
  }
  .header__contents__hamburger__line::before {
    top: -8px;
  }
  .header__contents__hamburger__line::after {
    top: 8px;
  }

  .header.scrolled .header__contents__hamburger__line,
  .header.scrolled .header__contents__hamburger__line::before,
  .header.scrolled .header__contents__hamburger__line::after {
    background-color: #000;
  }

  .header__mobile-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.9);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.4s ease, visibility 0.4s ease;
  }

  .header__mobile-menu__list {
    text-align: center;
  }
  .header__mobile-menu__list__item {
    color: #fff;
    font-size: 28px;
    font-weight: 600;
    padding: 15px 0;
    cursor: pointer;
  }
  .header__mobile-menu__list__item a {
    color: #fff;
    text-decoration: none;
  }
  .header__mobile-menu__language {
    position: absolute;
    font-family: Pretendard;
    bottom: 120px;
    color: #fff;
    font-size: 18px;
    border: 1px solid #fff;
    border-radius: 20px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
  }

  .header__mobile-menu__language__current {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }

  .header__mobile-menu__language__current:hover {
    background: rgba(255, 255, 255, 0.2);
  }

  .header__mobile-menu__language__options {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
  }

  .header__mobile-menu__language.open .header__mobile-menu__language__options {
    max-height: 200px;
  }

  .header__mobile-menu__language__option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 16px;
  }

  .header__mobile-menu__language__option:hover {
    background: rgba(255, 255, 255, 0.2);
  }

  .header__mobile-menu__language__option.active {
    background: rgba(1, 106, 146, 0.8);
  }

  .header__mobile-menu__language .flag {
    font-size: 16px;
    width: 20px;
    text-align: center;
  }

  .header.menu-open .header__mobile-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .header.menu-open .header__contents__hamburger__line {
    background-color: transparent;
  }
  .header.menu-open .header__contents__hamburger__line::before {
    transform: translateY(8px) rotate(45deg);
  }
  .header.menu-open .header__contents__hamburger__line::after {
    transform: translateY(-8px) rotate(-45deg);
  }
  .header.menu-open .header__contents__hamburger__line::before,
  .header.menu-open .header__contents__hamburger__line::after {
    background-color: #fff;
  }
}

@media (max-width: 768px) {
  .header {
    height: 80px;
  }
  .header__contents {
    padding: 20px;
  }
  .header__contents__logo {
    width: 110px;
    height: 45px;
  }
  .header__mobile-menu__list__item {
    font-size: 24px;
  }
}