.header {
  --background-color: rgba(0, 0, 0, 0);
  color: var(--default-color);
  background-color: var(--background-color);
  padding: 15px 0;
  transition: all 0.5s;
  z-index: 997;
}

.header .logo {
  line-height: 1;
}

.header .logo > img {
  height: 23px;
  width: auto;
  margin-right: 10px;
  display: block;
  filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.35));
}

.logo-dual {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(140px, 12vw, 200px);
  max-width: 200px;
  height: clamp(32px, 3vw, 56px);
  margin-right: 10px;
}

.logo-dual-image {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(100%, 200px);
  height: min(100%, 60px);
  object-fit: contain;
  opacity: 0;
  animation: logoCrossfade 10s infinite ease-in-out;
  transform: translate(-50%, -50%);
  transform-origin: center;
}

.logo-dual-image.is-primary {
  animation-delay: 0s;
}

.logo-dual-image.is-secondary {
  animation-delay: 5s;
}

@keyframes logoCrossfade {
  0% {
    opacity: 0;
  }

  10% {
    opacity: 1;
  }

  45% {
    opacity: 1;
  }

  55% {
    opacity: 0;
  }

  100% {
    opacity: 0;
  }
}

.header .logo h1 {
  font-size: 30px;
  margin: 0;
  font-weight: 700;
  color: var(--heading-color);
}

.mobile-nav-toggle {
  display: none;
}

.header .header-social-links {
  padding-right: 15px;
  display: none;
}

.header .header-social-links a {
  color: color-mix(in srgb, var(--default-color), transparent 40%);
  padding-left: 6px;
  display: inline-block;
  transition: 0.3s;
  font-size: 16px;
}

.header .header-social-links a:hover {
  color: var(--accent-color);
}

.header .header-social-links a i {
  line-height: 0px;
}

@media (max-width: 1200px) {
  .header .logo {
    order: 1;
  }

  .header .header-social-links {
    order: 2;
  }

  .header .navmenu {
    order: 3;
  }
}

.scrolled .header {
  box-shadow: 0px 0 18px rgba(0, 0, 0, 0.1);
}

.scrolled .header {
  --background-color: rgba(13, 22, 39, 0.9);
  --default-color: #ffffff;
  --heading-color: #ffffff;
}

.index-page .header {
  --default-color: #ffffff;
  --heading-color: #ffffff;
  --nav-color: #ffffff;
}

@media (min-width: 801px) {
  .navmenu {
    padding: 0;
  }

  .navmenu ul {
    margin: 0;
    padding: 0;
    display: flex;
    list-style: none;
    align-items: center;
  }

  .navmenu li {
    position: relative;
  }

  .navmenu > ul > li {
    white-space: nowrap;
    padding: 15px 14px;
  }

  .navmenu > ul > li:last-child {
    padding-right: 0;
  }

  .navmenu a,
  .navmenu a:focus {
    color: rgba(255, 255, 255, 0.92);
    font-size: 15px;
    padding: 0 2px;
    font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic",
      var(--nav-font);
    font-weight: 600;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.25);
    display: flex;
    align-items: center;
    justify-content: space-between;
    white-space: nowrap;
    transition: color 0.3s ease;
    position: relative;
  }

  .navmenu a i,
  .navmenu a:focus i {
    font-size: 12px;
    line-height: 0;
    margin-left: 5px;
    transition: 0.3s;
  }

  .navmenu > ul > li > a:before {
    content: "";
    position: absolute;
    height: 2px;
    bottom: -27px;
    left: 0;
    background-color: var(--nav-hover-color);
    visibility: hidden;
    width: 0px;
    transition: all 0.3s ease-in-out 0s;
  }

  .navmenu a:hover:before,
  .navmenu li:hover > a:before,
  .navmenu .active:before {
    visibility: visible;
    width: 100%;
  }

  .navmenu li:hover > a,
  .navmenu .active,
  .navmenu .active:focus {
    color: var(--nav-color);
  }

  .navmenu .dropdown ul {
    margin: 0;
    padding: 10px 0;
    background: var(--nav-dropdown-background-color);
    display: block;
    position: absolute;
    visibility: hidden;
    left: 14px;
    top: 130%;
    opacity: 0;
    transition: 0.3s;
    border-radius: 4px;
    z-index: 99;
    border: 1px solid color-mix(in srgb, var(--accent-color), transparent 85%);
  }

  .navmenu .dropdown ul li {
    min-width: 200px;
  }

  .navmenu .dropdown ul a {
    padding: 10px 20px;
    font-size: 15px;
    text-transform: none;
    color: var(--nav-dropdown-color);
  }

  .navmenu .dropdown ul a i {
    font-size: 12px;
  }

  .navmenu .dropdown ul a:hover,
  .navmenu .dropdown ul .active:hover,
  .navmenu .dropdown ul li:hover > a {
    color: var(--nav-dropdown-hover-color);
  }

  .navmenu .dropdown:hover > ul {
    opacity: 1;
    top: 100%;
    visibility: visible;
  }

  .navmenu .dropdown .dropdown ul {
    top: 0;
    left: -90%;
    visibility: hidden;
  }

  .navmenu .dropdown .dropdown:hover > ul {
    opacity: 1;
    top: 0;
    left: -100%;
    visibility: visible;
  }
}

@media (max-width: 800px) {
  .mobile-nav-toggle {
    display: block;
    color: var(--nav-color);
    font-size: 28px;
    line-height: 0;
    margin-right: 10px;
    cursor: pointer;
    transition: color 0.3s;
  }

  .navmenu {
    padding: 0;
    z-index: 9997;
  }

  .navmenu ul {
    display: none;
    list-style: none;
    position: absolute;
    inset: 60px 20px 20px 20px;
    padding: 10px 0;
    margin: 0;
    border-radius: 6px;
    background-color: var(--nav-mobile-background-color);
    border: 1px solid color-mix(in srgb, var(--default-color), transparent 90%);
    box-shadow: none;
    overflow-y: auto;
    transition: 0.3s;
    z-index: 9998;
  }

  .navmenu a,
  .navmenu a:focus {
    color: var(--nav-dropdown-color);
    padding: 10px 20px;
    font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic",
      var(--nav-font);
    font-size: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: space-between;
    white-space: nowrap;
    transition: color 0.3s ease;
    border-bottom: none;
  }

  .navmenu a i,
  .navmenu a:focus i {
    font-size: 12px;
    line-height: 0;
    margin-left: 5px;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: 0.3s;
    background-color: color-mix(in srgb, var(--accent-color), transparent 90%);
  }

  .navmenu a i:hover,
  .navmenu a:focus i:hover {
    background-color: var(--accent-color);
    color: var(--contrast-color);
  }

  .navmenu a:hover,
  .navmenu .active,
  .navmenu .active:focus {
    color: var(--nav-dropdown-hover-color);
  }

  .navmenu .active i,
  .navmenu .active:focus i {
    background-color: var(--accent-color);
    color: var(--contrast-color);
    transform: rotate(180deg);
  }

  .navmenu .dropdown ul {
    position: static;
    display: none;
    z-index: 99;
    padding: 10px 0;
    margin: 10px 20px;
    background-color: var(--nav-dropdown-background-color);
    transition: all 0.5s ease-in-out;
  }

  .navmenu .dropdown ul ul {
    background-color: rgba(33, 37, 41, 0.1);
  }

  .navmenu .dropdown > .dropdown-active {
    display: block;
    background-color: rgba(33, 37, 41, 0.03);
  }

  .mobile-nav-active {
    overflow: hidden;
  }

  .mobile-nav-active .mobile-nav-toggle {
    color: #fff;
    position: absolute;
    font-size: 32px;
    top: 15px;
    right: 15px;
    margin-right: 0;
    z-index: 9999;
  }

  .mobile-nav-active .navmenu {
    position: fixed;
    overflow: hidden;
    inset: 0;
    background: rgba(33, 37, 41, 0.8);
    transition: 0.3s;
  }

  .mobile-nav-active .navmenu > ul {
    display: block;
  }
}