/* ============================================================
   layout/header.css — fixed header, desktop nav, mobile menu
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: 5rem;
  display: flex;
  align-items: center;
  transition: background var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: hsl(var(--background) / 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: hsl(var(--border));
}
.site-header .container-luxury {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: hsl(var(--foreground));
}
.nav-desktop { display: none; align-items: center; gap: 2.5rem; }
.nav-desktop a:not(.btn-luxury) {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: hsl(var(--foreground) / 0.8);
  transition: color var(--transition-base);
}
.nav-desktop a:not(.btn-luxury):hover { color: hsl(var(--primary)); }
.nav-desktop .btn-luxury { padding: 0.65rem 1.5rem; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  color: hsl(var(--foreground));
}
.nav-toggle .icon-close { display: none; }
.nav-toggle.is-open .icon-open { display: none; }
.nav-toggle.is-open .icon-close { display: inline-flex; }

.nav-mobile {
  position: fixed;
  top: 5rem;
  left: 0;
  right: 0;
  z-index: 45;
  background: hsl(var(--background) / 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid hsl(var(--border));
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  opacity: 0;
  transform: translateY(-0.75rem);
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.nav-mobile.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
.nav-mobile a:not(.btn-luxury) {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: hsl(var(--foreground) / 0.85);
}
.nav-mobile a:not(.btn-luxury):hover { color: hsl(var(--primary)); }
.nav-mobile .btn-luxury { margin-top: 0.5rem; }

@media (min-width: 768px) {
  .nav-desktop { display: flex; }
  .nav-toggle { display: none; }
  .nav-mobile { display: none; }
}