/* ══════════════════════════════════════════════════
   VALOR MEDICAL REVIEWS — Navigation
   Fixed header, scroll-aware, mobile menu
   ══════════════════════════════════════════════════ */

/* ── Fixed Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base), background var(--transition-base);
}

/* 2px accent rule at top */
.site-header::before {
  content: '';
  display: block;
  height: 2px;
  background: var(--color-burgundy);
}

/* Scroll state */
.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255,255,255,0.99);
}

/* ── Nav Container ── */
.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

/* ── Logo ── */
.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--text-md);
  color: var(--color-navy);
  letter-spacing: var(--tracking-wide);
  font-weight: var(--weight-semibold);
  white-space: nowrap;
}

.nav-logo:hover {
  color: var(--color-burgundy);
}

/* ── Desktop Links ── */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-navy);
  transition: color var(--transition-fast);
  letter-spacing: var(--tracking-tight);
  position: relative;
}

.nav-link:hover {
  color: var(--color-burgundy);
}

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-burgundy);
}

/* ── Nav CTA Button ── */
.nav-cta {
  display: inline-block;
  padding: 10px 24px;
  background: var(--color-navy);
  color: var(--color-white) !important;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  transition: all var(--transition-base);
}

.nav-cta:hover {
  background: var(--color-burgundy);
  transform: translateY(-1px);
}

/* ── Mobile Toggle ── */
.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  z-index: calc(var(--z-nav) + 10);
}

.nav-mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-navy);
  margin: 5px 0;
  transition: all var(--transition-slow);
  transform-origin: center;
}

/* Hamburger → X animation */
.nav-mobile-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-mobile-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-mobile-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Mobile Menu Panel ── */
.nav-mobile-menu {
  display: none;
}

.nav-mobile-menu.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: calc(var(--nav-height) + 2px);
  left: 0;
  right: 0;
  background: var(--color-white);
  padding: var(--space-5);
  gap: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  z-index: var(--z-dropdown);
}

.nav-mobile-link {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-navy);
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.nav-mobile-link:hover {
  color: var(--color-burgundy);
}

.nav-mobile-cta {
  display: block;
  text-align: center;
  padding: 14px 24px;
  background: var(--color-navy);
  color: var(--color-white);
  border-radius: var(--radius-pill);
  font-weight: var(--weight-semibold);
  margin-top: var(--space-2);
  transition: background var(--transition-base);
}

.nav-mobile-cta:hover {
  background: var(--color-burgundy);
}

/* ── Dark Hero Support ── */
.site-header--on-dark {
  background: transparent;
  border-bottom-color: transparent;
}

.site-header--on-dark .nav-logo,
.site-header--on-dark .nav-link {
  color: var(--color-white);
}

.site-header--on-dark .nav-mobile-toggle span {
  background: var(--color-white);
}

.site-header--on-dark.is-scrolled {
  background: rgba(255,255,255,0.97);
  border-bottom-color: var(--color-border);
}

.site-header--on-dark.is-scrolled .nav-logo,
.site-header--on-dark.is-scrolled .nav-link {
  color: var(--color-navy);
}

.site-header--on-dark.is-scrolled .nav-mobile-toggle span {
  background: var(--color-navy);
}

/* ── Body offset for fixed nav ── */
.has-fixed-nav {
  scroll-padding-top: var(--nav-height);
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .nav-mobile-toggle {
    display: block;
  }
}