.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(24px);
  background: linear-gradient(180deg, rgba(4, 5, 15, 0.96), rgba(4, 5, 15, 0.9));
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.site-header__branding {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.site-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(212, 175, 55, 0.7);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: radial-gradient(circle at 30% 0, rgba(240, 201, 76, 0.35), rgba(10, 8, 3, 0.9));
  color: #1b1405;
  box-shadow: var(--shadow-soft);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
}

.site-header__brand-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-header__brand-tagline {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-text-muted);
}

.site-header__nav {
  margin-left: auto;
}

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

.site-header__nav-link {
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  position: relative;
  padding: 0.25rem 0;
}

.site-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0, var(--color-primary) 40%, var(--color-primary-strong) 100%);
  transition: width var(--transition-medium);
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-primary-strong);
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  width: 100%;
}

.site-header__nav-item--primary {
  margin-left: var(--space-2);
}

.site-header__nav-link--button {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(212, 175, 55, 0.7);
  background: radial-gradient(circle at top, rgba(240, 201, 76, 0.28), rgba(14, 10, 3, 0.96));
  color: #fdf5da;
  box-shadow: var(--shadow-soft);
}

.site-header__nav-link--button::after {
  display: none;
}

.site-header__nav-link--button:hover,
.site-header__nav-link--button:focus-visible {
  background: linear-gradient(135deg, #f0c94c, #d4af37);
  color: #221b08;
}

/* Mobile toggle */
.site-header__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(7, 8, 18, 0.8);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.22rem;
}

.site-header__toggle-bar {
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text);
  transition: transform var(--transition-medium), opacity var(--transition-medium), background var(--transition-medium);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-primary-strong);
  outline-offset: 3px;
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle.is-open .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* Mobile layout */
@media (max-width: 768px) {
  .site-header__inner {
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at top, rgba(212, 175, 55, 0.06), rgba(5, 6, 16, 0.98));
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transform-origin: top;
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding-inline: var(--space-4);
    padding-block: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-medium) ease-out, padding-block var(--transition-medium) ease-out;
  }

  .site-header__nav-item {
    width: 100%;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
  }

  .site-header__nav-link,
  .site-header__nav-link--button {
    display: block;
    width: 100%;
    padding-block: 0.9rem;
  }

  .site-header__nav-link--button {
    margin-block: 0.5rem 0.75rem;
    text-align: center;
  }

  .site-header__nav-link::after {
    bottom: 0.25rem;
  }

  .site-header__nav-list.is-open {
    max-height: 480px;
    padding-block: var(--space-2) var(--space-4);
  }
}

@media (max-width: 520px) {
  .site-header__brand-tagline {
    display: none;
  }

  .site-header__brand-name {
    font-size: 0.95rem;
  }
}