.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 50;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-medium) var(--ease-fluid);
}

/* Blur lives on a pseudo-element, not .site-header itself, because
   backdrop-filter on an ancestor creates a new containing block for
   position:fixed descendants (like .site-nav) — that trapped the mobile
   menu's height to the header bar instead of the full viewport. */
.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(6, 6, 7, 0.82);
  backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity var(--duration-medium) var(--ease-fluid);
}

/* backdrop-filter forces the browser to re-sample everything behind this
   fixed bar on every scroll frame — a well-known jank source on mid-range
   mobile GPUs. The bar stays just as readable with a slightly more opaque
   flat background and no real-time blur. */
@media (max-width: 860px), (pointer: coarse) {
  .site-header::before {
    background: rgba(6, 6, 7, 0.94);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
}

.site-header.is-scrolled::before {
  opacity: 1;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__brand img {
  height: 3.75rem;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
}

.site-nav__list a {
  font-size: var(--type-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  position: relative;
  padding-block: 0.35rem;
  transition: color var(--duration-fast) ease;
}

.site-nav__list a::after {
  content: '';
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  height: 1px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-fast) var(--ease-fluid);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  color: var(--color-text);
}

.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__list a.is-active {
  color: var(--color-gold);
}

.site-nav__list a.is-active::after {
  background: var(--color-gold);
  transform: scaleX(1);
}

.site-nav__social {
  display: none;
}

.btn-cta {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--color-gold-dim);
  border-radius: 999px;
  font-size: var(--type-small);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-gold);
  transition: background var(--duration-fast) ease, color var(--duration-fast) ease,
    border-color var(--duration-fast) ease;
}

.btn-cta__ripple {
  position: absolute;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-text) 45%, transparent);
  pointer-events: none;
  transform: scale(0);
  opacity: 0.55;
  animation: btn-ripple 0.6s ease-out forwards;
}

@keyframes btn-ripple {
  to {
    transform: scale(1);
    opacity: 0;
  }
}

.btn-cta:hover,
.btn-cta:focus-visible {
  background: var(--color-gold);
  color: #17130a;
  border-color: var(--color-gold);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  gap: 6px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
}

.nav-toggle span {
  height: 1px;
  background: var(--color-text);
  transform-origin: center;
  transition: transform var(--duration-medium) var(--ease-fluid),
    opacity var(--duration-medium) var(--ease-fluid),
    background-color var(--duration-medium) var(--ease-fluid),
    width var(--duration-fast) var(--ease-fluid),
    filter var(--duration-medium) var(--ease-fluid);
}

.nav-toggle span:nth-child(1) { width: 22px; }
.nav-toggle span:nth-child(2) { width: 14px; }
.nav-toggle span:nth-child(3) { width: 22px; }

.nav-toggle:hover span,
.nav-toggle:focus-visible span {
  background-color: var(--color-gold);
}

.nav-toggle.is-active span {
  background-color: var(--color-gold);
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--color-glow-violet) 65%, transparent));
}

.nav-toggle.is-active span:nth-child(1) {
  width: 22px;
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.is-active span:nth-child(3) {
  width: 22px;
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 860px) {
  .site-nav {
    position: fixed;
    inset-block-start: var(--nav-height);
    inset-inline: 0;
    inset-block-end: 0;
    z-index: 1;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4) var(--container-pad);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-medium) var(--ease-fluid),
      transform var(--duration-medium) var(--ease-fluid), visibility var(--duration-medium);
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .site-nav__social {
    display: flex;
    margin-block-start: var(--space-2);
  }

  .nav-toggle {
    display: flex;
  }
}