/* ==========================================================================
   HEADER.CSS — Sticky Site Header, Navigation, Mobile Menu
   Plaza Hotel
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Site Header
   -------------------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  width: 100%;
  background-color: transparent;
  transition: background-color var(--transition-slow),
              box-shadow var(--transition-slow),
              backdrop-filter var(--transition-slow);
}

/* Scrolled state — white bg + shadow */
.site-header.scrolled {
  background-color: var(--color-white);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.10);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* Force white header on inner pages (no hero) */
.site-header--solid {
  background-color: var(--color-white);
  box-shadow: 0 1px 0 var(--color-border);
}

/* --------------------------------------------------------------------------
   2. Nav Container
   -------------------------------------------------------------------------- */
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --------------------------------------------------------------------------
   3. Site Logo
   -------------------------------------------------------------------------- */
.site-logo {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: var(--fw-bold);
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color var(--transition-fast), opacity var(--transition-fast);
  flex-shrink: 0;
  line-height: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo .logo-accent {
  color: var(--color-accent-light);
}

/* Switch to dark when scrolled */
.site-header.scrolled .site-logo,
.site-header--solid .site-logo {
  color: var(--color-accent);
}

.site-logo:hover {
  opacity: 0.88;
}

/* Logo image variant */
.site-logo img {
  height: 44px;
  width: auto;
}

/* --------------------------------------------------------------------------
   4. Navigation Menu
   -------------------------------------------------------------------------- */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* --------------------------------------------------------------------------
   5. Nav Links
   -------------------------------------------------------------------------- */
.nav-link {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.90);
  text-decoration: none;
  padding: 0.25rem 0;
  position: relative;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

/* Underline indicator */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent-light);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition);
}

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

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

.nav-link.active {
  color: var(--color-accent-light);
}

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

/* Dark text when scrolled */
.site-header.scrolled .nav-link,
.site-header--solid .nav-link {
  color: var(--color-text);
}

.site-header.scrolled .nav-link:hover,
.site-header--solid .nav-link:hover {
  color: var(--color-accent);
}

.site-header.scrolled .nav-link::after,
.site-header--solid .nav-link::after {
  background-color: var(--color-accent);
}

.site-header.scrolled .nav-link.active,
.site-header--solid .nav-link.active {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   6. CTA Button in Nav
   -------------------------------------------------------------------------- */
.nav-cta {
  background-color: var(--color-accent);
  border: 2px solid var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.55rem 1.375rem;
  border-radius: var(--radius);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--transition),
              border-color var(--transition),
              box-shadow var(--transition);
  box-shadow: 0 2px 10px rgba(139, 105, 20, 0.30);
}

.nav-cta:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  box-shadow: 0 4px 16px rgba(139, 105, 20, 0.40);
  color: var(--color-white);
}

/* When header is transparent (on hero), show white outline variant too */
.site-header:not(.scrolled):not(.site-header--solid) .nav-cta {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   7. Hamburger Button (mobile)
   -------------------------------------------------------------------------- */
.hamburger {
  display: none; /* hidden on desktop */
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius);
  transition: background-color var(--transition-fast);
  flex-shrink: 0;
  z-index: calc(var(--z-fixed) + 10);
}

.hamburger:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

.site-header.scrolled .hamburger:hover,
.site-header--solid .hamburger:hover {
  background-color: var(--color-surface);
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: var(--radius-full);
  transition: transform var(--transition),
              opacity var(--transition),
              background-color var(--transition-fast);
}

.site-header.scrolled .hamburger-bar,
.site-header--solid .hamburger-bar {
  background-color: var(--color-text);
}

/* Hamburger → X animation */
.hamburger.is-open .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open .hamburger-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.is-open .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   8. Mobile Nav (off-canvas slide from top)
   -------------------------------------------------------------------------- */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: calc(var(--z-fixed) + 5);
  background-color: var(--color-white);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
  padding: 6rem 1.5rem 2rem;
  transform: translateY(-100%);
  transition: transform var(--transition-slow) cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  max-height: 100vh;
}

.mobile-nav.is-open {
  transform: translateY(0);
}

.mobile-nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-nav-item {
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link {
  display: block;
  padding: 1rem 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-accent);
  padding-left: 0.5rem;
}

.mobile-nav-cta {
  margin-top: 1.5rem;
  display: block;
  text-align: center;
  background-color: var(--color-accent);
  border: 2px solid var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.875rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color var(--transition), border-color var(--transition);
}

.mobile-nav-cta:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

/* Backdrop overlay for mobile menu */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-fixed) + 4);
  background-color: rgba(15, 14, 12, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}

.mobile-nav-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}