.site-header {
  height: var(--header-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    height 0.35s ease,
    background-color 0.4s ease,
    box-shadow 0.4s ease,
    backdrop-filter 0.4s ease;
}

.site-header[data-scrolled="true"] {
  height: var(--header-height-scrolled);
  background: rgb(var(--color-bg-white) / 0.72);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  box-shadow: 0 12px 30px -14px rgb(var(--color-coal) / 0.18);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgb(var(--color-gold) / 0.55), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.site-header[data-scrolled="true"]::after {
  opacity: 1;
}

.logo-mark-light {
  display: none;
}

.site-header[data-tone="light"] .logo-mark-dark {
  display: none;
}

.site-header[data-tone="light"] .logo-mark-light {
  display: block;
}

.nav-link {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgb(var(--color-coal) / 0.62);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-header[data-tone="light"] .nav-link {
  color: rgb(255 255 255 / 0.78);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -6px;
  height: 2px;
  background: rgb(var(--color-gold));
  transition: right 0.25s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: rgb(var(--color-coal));
}

.site-header[data-tone="light"] .nav-link:hover,
.site-header[data-tone="light"] .nav-link:focus-visible {
  color: #ffffff;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  right: 0;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-btn);
  background: rgb(var(--color-gold));
  color: rgb(var(--color-coal));
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color 0.3s ease,
    filter 0.2s ease,
    transform 0.2s ease;
}

.btn-primary:hover {
  filter: brightness(1.06);
}

.btn-primary:active {
  transform: scale(0.97);
}

.site-header[data-tone="light"] .header-cta {
  background: #ffffff;
  color: rgb(var(--color-coal));
}

.menu-toggle {
  position: relative;
  width: 32px;
  height: 32px;
  gap: 6px;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

.menu-toggle-bar {
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: rgb(var(--color-coal));
  transition:
    transform 0.3s ease,
    opacity 0.2s ease,
    background-color 0.3s ease;
}

.site-header[data-tone="light"] .menu-toggle-bar {
  background: #ffffff;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bar:first-child {
  transform: translateY(4px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bar:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

.mobile-menu {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  background: rgb(var(--color-bg-white) / 0.9);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-top: 1px solid rgb(var(--color-coal) / 0.06);
  transition:
    max-height 0.35s ease,
    opacity 0.25s ease;
}

.mobile-menu[data-open="true"] {
  max-height: 420px;
  opacity: 1;
}

.mobile-link {
  display: block;
  padding: 12px 4px;
  font-size: 0.95rem;
  font-weight: 500;
  color: rgb(var(--color-coal) / 0.75);
  text-decoration: none;
  border-bottom: 1px solid rgb(var(--color-coal) / 0.06);
}

.mobile-link:last-of-type {
  border-bottom: 0;
}

.mobile-link:hover,
.mobile-link:focus-visible {
  color: rgb(var(--color-coal));
}