.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
}

.site-header .header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}

.site-header .brand {
  flex: 0 0 auto;
}

.site-header .header-inner > div.brand,
.site-header .header-inner > nav.navlinks,
.site-header .header-inner > a.cta:not(.header-cta) {
  display: none;
}

.menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 0;
  border-radius: 14px;
  background: rgba(239, 250, 246, 0.92);
  color: var(--mint-dark);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  box-shadow: 0 12px 30px rgba(6, 46, 40, 0.08);
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header.nav-open .menu-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header.nav-open .menu-toggle span:nth-child(2) {
  opacity: 0;
}

.site-header.nav-open .menu-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-shell {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.site-header .navlinks {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-header .navlinks a,
.site-header .submenu-toggle {
  position: relative;
  padding: 6px 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.94rem;
  transition: color 0.2s ease;
}

.site-header .navlinks a::after,
.site-header .submenu-toggle::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: linear-gradient(135deg, var(--mint), var(--sky));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.site-header .navlinks a:hover,
.site-header .submenu-toggle:hover,
.site-header .navlinks a:focus-visible,
.site-header .submenu-toggle:focus-visible,
.site-header .nav-item.open > .submenu-toggle {
  color: var(--ink);
}

.site-header .navlinks a:hover::after,
.site-header .navlinks a:focus-visible::after,
.site-header .submenu-toggle:hover::before,
.site-header .submenu-toggle:focus-visible::before,
.site-header .nav-item.open > .submenu-toggle::before {
  transform: scaleX(1);
}

.site-header .navlinks a:focus-visible,
.site-header .submenu-toggle:focus-visible,
.menu-toggle:focus-visible {
  outline: 2px solid rgba(2, 132, 199, 0.45);
  outline-offset: 4px;
}

.nav-item {
  position: relative;
}

.submenu-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.submenu-toggle::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  transition: transform 0.2s ease;
}

.nav-item.open > .submenu-toggle::after {
  transform: rotate(-135deg) translateY(-1px);
}

.submenu {
  position: absolute;
  top: calc(100% + 16px);
  left: 0;
  min-width: 224px;
  display: grid;
  gap: 6px;
  padding: 12px;
  border: 1px solid rgba(15, 118, 110, 0.16);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 22px 56px rgba(6, 46, 40, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
}

.nav-item.open > .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.submenu a {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--ink);
}

.submenu a:hover,
.submenu a:focus-visible {
  background: rgba(239, 250, 246, 0.95);
}

.submenu a::after {
  display: none;
}

.header-cta {
  white-space: nowrap;
}

.nav-scrim {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 980px) {
  body.nav-open {
    overflow: hidden;
  }

  .site-header .header-inner {
    min-height: 72px;
  }

  .menu-toggle {
    display: inline-flex;
    flex: 0 0 auto;
  }

  .nav-scrim {
    position: fixed;
    inset: 0;
    top: 0;
    background: rgba(12, 31, 28, 0.34);
  }

  .site-header.nav-open .nav-scrim {
    display: block;
  }

  .nav-shell {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    z-index: 5;
    display: grid;
    gap: 18px;
    padding: 20px;
    border: 1px solid rgba(15, 118, 110, 0.14);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 26px 56px rgba(6, 46, 40, 0.16);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  }

  .site-header.nav-open .nav-shell {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-header .navlinks {
    display: grid;
    gap: 8px;
  }

  .site-header .navlinks a,
  .site-header .submenu-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(239, 250, 246, 0.8);
    color: var(--ink);
  }

  .site-header .navlinks a::after,
  .site-header .submenu-toggle::before {
    display: none;
  }

  .submenu {
    position: static;
    min-width: 0;
    margin-top: 8px;
    padding: 8px;
    border-radius: 16px;
    background: rgba(239, 250, 246, 0.92);
    box-shadow: none;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav-item.open > .submenu {
    display: grid;
  }

  .header-cta {
    width: 100%;
  }
}