/* Header - Intervivo (builds on base.css) */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-gray-200);
  backdrop-filter: saturate(120%) blur(6px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: var(--space-6);
}

/* Branding */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-charcoal);
}
.brand:hover { color: var(--color-gold-dark); }
.brand:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 3px; }
.brand-mark { color: var(--color-gold); font-size: 1.25rem; line-height: 1; }
.brand-text { font-family: var(--font-primary); font-size: clamp(1.25rem, 2.4vw, 1.75rem); letter-spacing: var(--tracking-tight); }

/* Navigation */
.primary-nav { position: relative; }
.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-4), 3vw, var(--space-8));
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-link {
  color: var(--color-charcoal);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: var(--space-2) 0;
  position: relative;
}
.nav-link:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 4px; }
.nav-link:hover { color: var(--color-gold-dark); }
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px; background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-luxury);
}
.nav-link:hover::after { transform: scaleX(1); }

/* Mobile toggle */
.menu-toggle { display: none; gap: var(--space-2); }
.menu-toggle .menu-icon { font-size: 1.125rem; color: var(--color-charcoal); }
.menu-toggle[aria-expanded="true"] .menu-icon { color: var(--color-gold-dark); }

/* JS-enhanced mobile behavior */
@media (max-width: 960px) {
  html.has-js .menu-toggle { display: inline-flex; }
  html.has-js  .primary-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-md);
    display: none;
  }
  html.has-js .is-open .primary-nav { display: block; }
  html.has-js .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  html.has-js .nav-item { border-top: 1px solid var(--color-gray-200); }
  html.has-js .nav-link { padding: var(--space-4) var(--space-6); display: block; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .nav-link::after { transition: none; }
}