.gc-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-sticky);
  transition: all var(--transition-base);
}


.gc-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  opacity: 0;
  transition: opacity var(--transition-base);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.gc-header.scrolled::before {
  opacity: 1;
}


.gc-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--gradient-hero);
  opacity: 0;
  transform: scaleX(0);
  transition: all var(--transition-slow);
}

.gc-header.scrolled::after {
  opacity: 0.5;
  transform: scaleX(1);
}


.gc-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem var(--space-xl);
  max-width: 1600px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}


.gc-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  position: relative;
  z-index: 2;
  transition: transform var(--transition-base);
}

.gc-brand:hover {
  transform: scale(1.05);
}

.gc-logo {
  height: 50px;
  width: auto;
  filter: drop-shadow(0 0 20px rgba(0, 230, 118, 0.2));
  transition: filter var(--transition-base);
}

.gc-brand:hover .gc-logo {
  filter: drop-shadow(0 0 30px rgba(0, 230, 118, 0.3));
}


.gc-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  position: relative;
}

.gc-dd-mobile-only {
  display: none;
}

.gc-dd-desktop-only,
.gc-link-desktop-only {
  display: block;
}

.gc-link {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 0.5rem 0;
  transition: color var(--transition-fast);
  cursor: pointer;
}


.gc-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-hero);
  transition: width var(--transition-base);
}

.gc-link:hover {
  color: var(--color-text-primary);
}

.gc-link:hover::after {
  width: 100%;
}


.gc-dd {
  position: relative;
}

.gc-dd-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.gc-caret {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}

.gc-dd.is-open .gc-caret {
  transform: rotate(180deg);
}


.gc-dd-panel {
  position: absolute;
  top: calc(100% + 1rem);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 280px;
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.gc-dd.is-open .gc-dd-panel {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}


.gc-dd-panel a {
  display: block;
  padding: 0.875rem 1.25rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.gc-dd-panel a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--gradient-hero);
  transition: height var(--transition-base);
}

.gc-dd-panel a:hover {
  color: var(--color-text-primary);
  background: rgba(0, 230, 118, 0.05);
  padding-left: 1.75rem;
}

.gc-dd-panel a:hover::before {
  height: 60%;
}


.gc-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}


.gc-lang {
  padding: 0.625rem 1.25rem;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent-primary);
  background: transparent;
  border: 2px solid var(--color-accent-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.gc-lang::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 0;
  height: 0;
  background: var(--color-accent-primary);
  border-radius: 50%;
  transition: all var(--transition-base);
}

.gc-lang:hover {
  color: var(--color-bg-primary);
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 20px rgba(0, 230, 118, 0.2);
}

.gc-lang:hover::before {
  width: 200%;
  height: 200%;
}

.gc-lang span {
  position: relative;
  z-index: 1;
}


.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-base);
}

.mobile-toggle:hover {
  border-color: var(--color-accent-primary);
  background: rgba(0, 230, 118, 0.05);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

.mobile-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.mobile-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.mobile-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}


.mobile-menu {
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  max-height: calc(100vh - 80px);
  background: var(--color-bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: all var(--transition-base);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.mobile-menu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-menu.is-hidden {
  display: none;
}

.mobile-menu .nav-link {
  display: block;
  padding: 1rem 0;
  color: var(--color-text-secondary);
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-fast);
}

.mobile-menu .nav-link:hover {
  color: var(--color-accent-primary);
  padding-left: var(--space-sm);
}


@media (max-width: 992px) {
  .gc-nav {
    padding: 0.75rem var(--space-md);
  }
  
  .gc-logo {
    height: 35px;
  }
  
  .gc-links {
    display: flex;
    gap: 0.75rem;
    flex: 1;
    justify-content: center;
    margin: 0 0.5rem;
  }
  
  .gc-dd-desktop-only,
  .gc-link-desktop-only {
    display: none;
  }
  
  .gc-dd-mobile-only {
    display: block;
  }
  
  .gc-link {
    font-size: 0.8rem;
    padding: 0.375rem 0;
    gap: 0.25rem;
  }
  
  .gc-caret {
    font-size: 0.6rem;
  }
  
  .gc-dd-panel {
    min-width: 200px;
  }
  
  .gc-dd-panel a {
    padding: 0.625rem 1rem;
    font-size: 0.85rem;
  }
  
  .mobile-toggle {
    display: none;
  }
  
  .mobile-menu {
    display: none !important;
  }
  
  .gc-lang {
    padding: 0.5rem 0.875rem;
    font-size: 0.75rem;
  }
  
  .gc-actions {
    gap: 0.5rem;
  }
}

@media (max-width: 576px) {
  .gc-logo {
    height: 30px;
  }
  
  .gc-nav {
    padding: 0.625rem var(--space-sm);
  }
  
  .gc-links {
    gap: 0.5rem;
    margin: 0 0.25rem;
  }
  
  .gc-link {
    font-size: 0.7rem;
    padding: 0.25rem 0;
  }
  
  .gc-lang {
    padding: 0.375rem 0.625rem;
    font-size: 0.7rem;
  }
  
  .gc-dd-panel {
    min-width: 180px;
  }
  
  .gc-dd-panel a {
    padding: 0.5rem 0.875rem;
    font-size: 0.8rem;
  }
}


.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--gradient-hero);
  transform-origin: left;
  transform: scaleX(0);
  z-index: calc(var(--z-sticky) + 1);
  transition: transform 0.1s ease-out;
}