/* ==========================================================================
   Header / Navbar - Sagra del Borgo Antico di Montefiore
   Fixed header that starts transparent and transitions to solid on scroll.
   Includes desktop nav, mobile hamburger menu, and smart-hide behaviour.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Site Header
   Fixed at top, starts transparent, gains background on scroll (.scrolled).
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-sticky);
  background-color: transparent;
  transition:
    background-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

/* Scrolled state: solid background with shadow */
.site-header.scrolled {
  background-color: var(--color-warm-white);
  box-shadow: var(--shadow-md);
}

/* Smart hide on scroll down */
.site-header.hidden {
  transform: translateY(-100%);
}

/* Quando menu mobile aperto: header sopra overlay per mostrare button X */
.site-header.menu-open {
  z-index: calc(var(--z-overlay) + 2);
  background-color: transparent !important;
  box-shadow: none !important;
}

/* --------------------------------------------------------------------------
   Header inner layout
   Logo left, nav links center, CTA button right.
   -------------------------------------------------------------------------- */
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

/* Logo */
.site-header__logo {
  flex-shrink: 0;
  z-index: calc(var(--z-sticky) + 1);
}

.site-header__logo img {
  height: 48px;
  width: auto;
}

.logo__text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* Logo text white on transparent header */
.site-header:not(.scrolled) .logo__text {
  color: var(--color-warm-white);
}


/* --------------------------------------------------------------------------
   Desktop Nav Links
   Horizontal list with animated underline on hover via ::after pseudo.
   -------------------------------------------------------------------------- */
.nav-links {
  display: none; /* Hidden on mobile, shown at 1024px (see responsive.css) */
  align-items: center;
  gap: var(--space-md);
}

.nav-link {
  position: relative;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-charcoal);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

/* Hover underline animation using ::after that scales from 0 to 1 */
.nav-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link:hover::after {
  transform: scaleX(1);
}

/* Active link: underline always visible */
.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after {
  transform: scaleX(1);
}

/* When header is transparent, nav links should be white */
.site-header:not(.scrolled) .nav-link {
  color: var(--color-warm-white);
}

.site-header:not(.scrolled) .nav-link:hover {
  color: var(--color-primary-light);
}

/* --------------------------------------------------------------------------
   Hamburger Button
   Three spans that animate to an X on .open. Visible only below 1024px.
   -------------------------------------------------------------------------- */
.hamburger {
  display: flex; /* Shown on mobile by default */
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  cursor: pointer;
  position: relative; /* Abilita z-index */
  z-index: calc(var(--z-overlay) + 1);
  background: none;
  border: none;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-charcoal);
  border-radius: var(--radius-pill);
  transition:
    transform var(--transition-base),
    opacity var(--transition-fast);
}

.hamburger span:nth-child(1) {
  transform: translateY(-6px);
}

.hamburger span:nth-child(3) {
  transform: translateY(6px);
}

/* When header is transparent, hamburger bars are white */
.site-header:not(.scrolled) .hamburger span {
  background-color: var(--color-warm-white);
}

/* Animate to X when active */
.hamburger.active span {
  background-color: var(--color-warm-white);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(2px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-2px) rotate(-45deg);
}

/* X su header scrollato: verde scuro per contrasto con sfondo bianco */
.site-header.scrolled .hamburger.active span {
  background-color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Mobile Nav Overlay
   Fullscreen overlay with centered links, slide-in animation.
   -------------------------------------------------------------------------- */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100dvh;
  background-color: var(--color-charcoal);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 100px;
  gap: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base),
    transform var(--transition-base);
}

/* Open state */
.mobile-nav.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Mobile nav links */
.mobile-nav__link {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-warm-white);
  text-transform: capitalize;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  padding: var(--space-md) var(--space-lg);
  min-height: 44px;
  border-bottom: 1px solid rgba(250, 245, 238, 0.1);
  width: 100%;
  max-width: 400px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-nav__link:first-child {
  border-top: 1px solid rgba(250, 245, 238, 0.1);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  color: var(--color-primary-light);
  text-decoration: none;
  background-color: rgba(250, 245, 238, 0.05);
}