/* ===============================================
   DEATHLAB HEADER & NAVIGATION
   Translucent header with cyan active states
   =============================================== */

/* Site Header */
.site-header,
.gh-head,
header[class*="header"] {
  position: sticky;
  top: 0;
  z-index: var(--z-header, 50);
  background: rgba(11, 11, 11, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: var(--dl-border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

/* Header Inner Container */
.site-header-inner,
.gh-head-inner,
.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

/* Logo */
.site-logo,
.gh-head-logo {
  display: flex;
  align-items: center;
  height: 32px;
  color: var(--dl-white);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  text-decoration: none !important;
}

.site-logo img,
.gh-head-logo img {
  height: 28px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
}

@media (min-width: 768px) {
  .site-logo img,
  .gh-head-logo img {
    height: 36px;
  }
}

/* Navigation */
.site-nav,
.gh-head-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  justify-content: center;
}

.site-nav nav,
.gh-head-menu nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Navigation Links */
.site-nav a,
.gh-head-menu a,
.nav-link {
  color: var(--dl-white);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none !important;
  position: relative;
  transition: color var(--transition-base), background-color var(--transition-base);
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.gh-head-menu a:hover,
.nav-link:hover {
  color: var(--dl-cyan);
  background: rgba(111, 228, 255, 0.05);
}

/* Active/Current Page */
.site-nav a[aria-current="page"],
.site-nav a.active,
.gh-head-menu a[aria-current="page"],
.gh-head-menu a.active,
.nav-link.active {
  color: var(--dl-white);
  border-bottom-color: var(--dl-cyan);
  text-shadow: 0 0 18px rgba(111, 228, 255, 0.35);
}

/* Header Actions (CTA, Search, etc.) */
.site-header-actions,
.gh-head-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Search Button */
.search-button,
[data-ghost-search] {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: var(--dl-border);
  color: var(--dl-steel);
  cursor: pointer;
  transition: all var(--transition-base);
}

.search-button:hover,
[data-ghost-search]:hover {
  background: rgba(111, 228, 255, 0.08);
  border-color: var(--dl-cyan);
  color: var(--dl-cyan);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle,
.gh-burger {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--dl-white);
  cursor: pointer;
}

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

  .site-nav,
  .gh-head-menu {
    display: none;
  }
}

/* Scrolled State - Enhanced Background */
.site-header.scrolled,
.gh-head.scrolled {
  background: rgba(11, 11, 11, 0.85);
  box-shadow: var(--dl-shadow-sm);
}

/* Focus Styles for Accessibility */
.site-nav a:focus-visible,
.gh-head-menu a:focus-visible,
.search-button:focus-visible,
[data-ghost-search]:focus-visible,
.mobile-menu-toggle:focus-visible {
  outline: 2px solid var(--dl-outline);
  outline-offset: 2px;
  box-shadow: 0 0 0 6px rgba(111, 228, 255, 0.15);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .site-nav a[aria-current="page"],
  .site-nav a.active,
  .gh-head-menu a[aria-current="page"],
  .gh-head-menu a.active {
    text-shadow: none;
  }

  .site-header,
  .gh-head,
  .site-nav a,
  .gh-head-menu a {
    transition: none;
  }
}