.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  background: transparent;
  transition: background-color .3s ease, backdrop-filter .3s ease;
}

.site-header.scrolled {
  background: hsl(221 86% 20% / .7);
  backdrop-filter: blur(12px);
}

.header-shell {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1rem 1.5rem 0;
}

.brand-logo {
  flex: none;
}

.brand-logo img {
  width: 8.75rem;
  height: auto;
  object-fit: contain;
  mix-blend-mode: screen;
}

.desktop-nav {
  display: flex;
  flex: 1 1 0%;
  align-items: center;
  justify-content: space-between;
  height: 4.625rem;
  gap: 1rem;
  border: 1px solid rgba(255, 255, 255, .15);
  border-radius: 1rem;
  background: hsl(221 86% 20% / .2);
  padding: 0 .75rem 0 1.75rem;
  backdrop-filter: blur(12px);
}

.desktop-nav-links,
.social-nav {
  display: flex;
  align-items: center;
}

.desktop-nav-links {
  gap: 2.25rem;
}

.nav-item {
  position: relative;
}

.nav-item > a {
  position: relative;
  display: flex;
  align-items: center;
  gap: .25rem;
  color: rgba(255, 255, 255, .85);
  font-family: var(--font-poppins);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.2px;
  transition: color .2s ease;
}

.nav-item > a:hover,
.nav-item > a.active {
  color: #fff;
}

.nav-item > a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -19px;
  width: 1.5rem;
  height: 2px;
  border-radius: 999px;
  background: #ffc400;
  transform: translateX(-50%);
}

.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 15rem;
  padding-top: .75rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, visibility .2s ease, transform .2s ease;
}

.submenu::before {
  content: "";
  position: absolute;
  inset: .75rem 0 0;
  display: block;
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 1rem;
  background: hsl(221 86% 20% / .95);
  box-shadow: 0 20px 45px rgba(0, 0, 0, .24);
  backdrop-filter: blur(12px);
}

.submenu a {
  position: relative;
  display: block;
  margin: .25rem;
  border-radius: .5rem;
  padding: .625rem 1rem;
  color: rgba(255, 255, 255, .8);
  font-size: .875rem;
  line-height: 1.25rem;
  transition: background .2s ease, color .2s ease;
}

.submenu a:hover {
  background: rgba(255, 255, 255, .1);
  color: #fff;
}

.has-submenu:hover .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.social-nav {
  gap: .5rem;
}

.social-nav a,
.mobile-menu-open,
.mobile-menu-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #fff;
  transition: background .2s ease;
}

.mobile-menu-open {
  display: none;
  margin-left: auto;
}

.social-nav a:hover,
.mobile-menu-open:hover,
.mobile-menu-close:hover {
  background: rgba(255, 255, 255, .1);
}

@media (min-width: 640px) {
  .header-shell {
    padding-right: 3rem;
    padding-left: 3rem;
  }

  .brand-logo img {
    width: 10rem;
  }
}

@media (min-width: 1024px) {
  .header-shell {
    gap: 1.25rem;
    padding: 1.25rem 4rem 0;
  }

  .brand-logo img {
    width: 11.5625rem;
  }
}

@media (max-width: 1279px) {
  .desktop-nav {
    display: none;
  }

  .mobile-menu-open {
    display: flex;
  }
}