/**
 * Header & Navigation Styles
 * Sticky header with smooth transitions
 */

/* ============================================
   SITE HEADER
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(38, 38, 38, 0.70);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  transition: all var(--transition-base);
  height: var(--header-height);
}

.site-header.scrolled {
  height: var(--header-height-scrolled);
  background-color: rgba(38, 38, 38, 0.98);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.header-container {
  width: 100%;
  padding: 0 var(--spacing-md);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  transition: height var(--transition-base);
}

.site-header.scrolled .header-inner {
  height: var(--header-height-scrolled);
}

/* ============================================
   SITE BRANDING / LOGO
   ============================================ */
.site-branding {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.site-branding .custom-logo-link {
  display: inline-block;
  line-height: 0;
}

.site-branding .custom-logo {
  max-height: 60px;
  width: auto;
  transition: max-height var(--transition-base);
}

.site-header.scrolled .custom-logo {
  max-height: 50px;
}

.site-logo-text {
  text-decoration: none;
}

.site-title {
  font-family: var(--font-accent);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.02em;
  margin: 0;
  transition: font-size var(--transition-base);
}

.site-header.scrolled .site-title {
  font-size: 1.5rem;
}

.site-description {
  display: none;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

/* ============================================
   MAIN NAVIGATION
   ============================================ */
.main-navigation {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu li {
  margin: 0;
  padding: 0;
}

.nav-menu a {
  display: inline-block;
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-gold);
}

/* Gold underline effect on hover and active */
.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), rgba(212, 175, 55, 0.5));
  transition: width var(--transition-base);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

/* ============================================
   MOBILE MENU TOGGLE
   ============================================ */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
  position: relative;
}

.hamburger-line {
  width: 28px;
  height: 3px;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 2px;
  transition: all var(--transition-base);
  margin: 3px 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

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

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* ============================================
   MOBILE MENU OVERLAY
   ============================================ */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   SKIP LINK
   ============================================ */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 100000;
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 992px) {
  .nav-menu {
    gap: var(--spacing-sm);
  }

  .nav-menu a {
    font-size: 0.9rem;
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .main-navigation {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: rgba(38, 38, 38, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.5);
    padding: calc(var(--header-height) + var(--spacing-md)) var(--spacing-md) var(--spacing-md);
    z-index: 999;
    transition: right var(--transition-base);
    overflow-y: auto;
  }

  .main-navigation.active {
    right: 0;
  }

  .nav-menu {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    width: 100%;
  }

  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-menu a {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) 0;
    font-size: 1.125rem;
  }

  .nav-menu a::after {
    display: none;
  }

  .mobile-menu-overlay {
    display: block;
  }

  .site-title {
    font-size: 1.5rem;
  }

  .site-header.scrolled .site-title {
    font-size: 1.25rem;
  }
}

@media (max-width: 480px) {
  :root {
    --header-height: 70px;
    --header-height-scrolled: 60px;
  }

  .header-container {
    padding: 0 var(--spacing-sm);
  }

  .site-branding .custom-logo {
    max-height: 50px;
  }

  .site-header.scrolled .custom-logo {
    max-height: 40px;
  }

  .site-title {
    font-size: 1.25rem;
  }

  .site-header.scrolled .site-title {
    font-size: 1.125rem;
  }
}